CN1317483C - Method of entering target geologic body and system - Google Patents
Method of entering target geologic body and system Download PDFInfo
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- CN1317483C CN1317483C CNB200510058991XA CN200510058991A CN1317483C CN 1317483 C CN1317483 C CN 1317483C CN B200510058991X A CNB200510058991X A CN B200510058991XA CN 200510058991 A CN200510058991 A CN 200510058991A CN 1317483 C CN1317483 C CN 1317483C
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Abstract
The present invention relates to a method of entering a target geologic body, which comprises the following steps: setting an auxiliary channel which can be realized by that favourable drilling conditions can be partly generated by injecting fluid to a target geologic body, and setting a drilling channel. The drilling channel is communicated with the auxiliary channel at the target geologic body position or the upper part of the position. Thus, the drilling work can be carried out under favorable conditions created by the auxiliary channel. The present invention is characterized in that when the auxiliary channel or the drilling channel is drilled, at least one pocket is continuously and downwards drilled passing through the target geologic body. The depth of the pocket is larger than a prearranged value, and the value is between 0 and 60 M. A horizontal main well hole and a plurality of branch well holes are drilled in the target geologic body by the drilling channel. The present invention also provides a system of entering a target geologic body. The present invention can fully enter a target geologic body under the condition of any ground, terrain or building. The present invention can also enhance the service life of the system, and can enhance the economy of the system.
Description
Technical field
The present invention relates to a kind of method and system of target approach geologic body, particularly, the connection face of land that is drilled to directed-drilling technique and the channel system of target geologic body.
Described target geologic body comprises reservoir bodies, solid mineral reserve or other geologic body of fluidised form mineral products such as preserving oil, natural gas, coal-formed gas, coal bed gas, coal mine gas, underground water.
Described target approach geologic body comprise enter from the face of land and from the tunnel, the underground building enters, with exploit, exploration, engineering geology monitoring or fluid re-injection.
The present invention relates to but be not limited to, by the system that forms by main borehole, a plurality of branch horizontal well eye and the straight well that is communicated with this main borehole that can set as required, extraction coal-bed gas.
The present invention is applicable to all kinds of landform (comprising the Plain and face of land area complicated and changeable), and particularly the subsurface geology under surface conditions such as hills, mountain area, river, seashore, major works, ancient buildings and human settlement is explored, reconnoitred and mining.
Term " pocket " is meant and is under the target geologic body, is used to collect landwaste and the part of the underground fluid that oozes out.
Background technology
For a long time, carrying out gas drainage under suction from the down-hole is the major technique that gas is administered in the colliery, but can't fundamentally solve safety in production and gas utilization problem.In process of coal mining, the coal mine gas disaster takes place often, even cause serious human casualty accident.
For extraction coal-bed gas fast and efficiently, realized using multi-branched horizontal well and carried out the surface mining of coal bed gas.
For example, CN1333858A discloses a kind of method and system that touches subterranean resource, comprising: at first be drilled to a bite straight well, and form a cavern at the reservoir place; Begin to bore the water horizontal well in distance straight well well head a distance, subdrilling peupendicular hole section then towards straight well cave deflecting, makes two wells be communicated with at the place, cave; After two wells are communicated with, continue to bore forward main horizontal hole and each branch well hole.
The problem that this patent application exists comprises: need get out two wells of straight well and horizontal well, need prepare a cavern at the subsurface reservoir place, the technology and equipment that two wells are communicated with at the cavern place guarantees that these make that all the setting up cost of system is very high.In addition, all branch well holes all are confined to after the so-called cave, like this, if because the influence of face of land landform or building situation, straight well and the horizontal well distant distance of must being separated by, so, because branch and eye are not set between straight well and the horizontal well, just can only exploit resource at a distance, but can not exploit resource nearby to greatest extent.
In addition, also there is such problem in this patent application, that is: the production casing that is lowered in straight well only is confined on cave or the reservoir, like this, after straight well cave and/or " pocket " are filled or cave in, is unfavorable for cleaning and repairs.
Summary of the invention
The method and system that the purpose of this invention is to provide a kind of target approach geologic body, it can be lowered into local recovery of subterranean resources with simpler channel system.
Another object of the present invention provides a kind of method and system of target approach geologic body, its in office where showing under landform or the building situation, fully recovery of subterranean resources.
Further purpose of the present invention provides a kind of method and system of target approach geologic body, and it can prevent caving in of " pocket ", helps clearing up the wherein landwaste of deposition, thus the application life that can improve system, and the economy of raising system.
Another purpose of the present invention provides a kind of method and system of target approach geologic body, and it adopts bridging plug, has drilling cuttings to fall into after formation again to prevent " pocket ", thereby further reduces the setting up cost of system.
Above-mentioned purpose of the present invention is realized by following technical proposal.
According to a first aspect of the invention, provide a kind of method of target approach geologic body, it comprises: accessory channel is set, partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body; The probing passage is set, and it is communicated with above target geologic body place or its with described accessory channel; When boring accessory channel or probing passage, pass the target geologic body and continue to get out a plurality of pockets downwards from a probing passage; In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage; Described accessory channel and described probing passage all are arranged in the same well.
In addition, originally can invent the method that another kind of target approach geologic body also is provided, it comprises: accessory channel is set, partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body; The probing passage is set, and it is communicated with above target geologic body place or its with described accessory channel; When boring accessory channel or probing passage, pass the target geologic body and continue to get out a plurality of pockets downwards from a probing passage; In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage: described accessory channel with drill passage and be positioned at different wells, and corresponding to target geologic body position the sleeve portion that easily drills through is set at accessory channel.
Particularly, described accessory channel and described probing passage all are arranged in the same well that comprises vertical or tilting section, curve transition section and horizontal segment.
Particularly, described accessory channel is a straight well, and in its resource reservoir position artificial cave is set: described probing passage is to begin the vertical or tilting section of horizontal well drilling with straight well well head one segment distance place, towards place, straight well cave direction deflecting, horizontal well is communicated with in a certain appropriate position with straight well at the place, cave.
Particularly, along the direction of boring horizontal main borehole, all get out some branch well holes in described accessory channel and the place ahead at described probing channel connection place and the appropriate position at rear.
Particularly, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.
Particularly, the bottom of sleeve pipe to pocket is set in straight well, these sleeve pipe two ends are ordinary casing, and are being the sleeve portion that easily drill through of length more than or equal to artificial cave height corresponding to target geologic body position; This sleeve portion that easily drills through in the handshaking procedures of horizontal well and straight well or before fallen by all or part of brill.
Particularly, when making children the worker cave, the removable bridging plug that maybe can bore is set in the sleeve pipe of described pocket.
According to a second aspect of the invention, provide a kind of system of target approach geologic body, it comprises: accessory channel partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body; The probing passage, it is communicated with above target geologic body place or its with described accessory channel; The a plurality of pockets that pass the target geologic body and extend downwards that when boring accessory channel or probing passage, get out: in the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage from a probing passage; Described accessory channel and described probing passage all are arranged in the same well.
In addition, the present invention also provides the system of another kind of target approach geologic body, and it comprises: accessory channel partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body; The probing passage, it is communicated with above target geologic body place or its with described accessory channel; The a plurality of pockets that pass the target geologic body and extend downwards that when boring accessory channel or probing passage, get out from a probing passage; In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage: described accessory channel with drill passage and be positioned at different wells, and corresponding to target geologic body position the sleeve portion that easily drills through is set at accessory channel.
Particularly, described accessory channel and described probing passage all are arranged in the same well that comprises vertical or tilting section, curve transition section and horizontal segment.
Particularly, described accessory channel is a straight well, and in its resource reservoir position artificial cave is set; Described probing passage is to begin to bore the horizontal well of vertical or tilting section with straight well well head one segment distance place, towards place, straight well cave direction deflecting, horizontal well is communicated with in a certain appropriate position with straight well at the place, cave.
Compared with prior art, the present invention has tangible advantage and technique effect.
According to the present invention, drill a passage and just can all hold straight well of the prior art and horizontal well simplifiedly wherein, therefore, the present invention has simplified channel system structure, has also reduced the drilling cost of system.In addition, owing to not needing to make children the worker cave, can further reduce the setting up cost of system.
According to the present invention, the direction along boring horizontal main borehole all can get out some branch well holes at the place ahead and the rear at described accessory channel and described probing channel connection place.Therefore, the present invention further increases the control area of multi-branched horizontal well, and the gas emission when making coal mining further reduces, thereby makes digging production efficiency higher, also safer.
According to the present invention, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.Therefore, the present invention further increases the control space of multi-branched horizontal well, and the gas emission when this also makes coal mining further reduces, thereby makes digging production efficiency higher, safer.
According to the present invention, when boring accessory channel or probing passage, pass resource reservoir (target geologic body) and continue to get out one or more pockets downwards.Therefore, can in considerable time, be used for the landwaste of collecting precipitation and the underground water that oozes out from the coal seam, thereby keep the unimpeded of aerogenesis passage, the application life of improving system, and the economy of raising system.
Furtherly, be the situation of straight well for described accessory channel, described pocket is provided with sleeve pipe, like this, can prevent caving in of " pocket ", also helps clearing up the landwaste in the pocket, extracts the underground water that oozes out from the coal seam, thereby improves the application life of system.
Furtherly, when making children the worker cave, the removable bridging plug that maybe can bore is set in the sleeve pipe of described pocket.Like this, the landwaste that produces in the worker cave process that makes children is cleared up easily, can not drop in pocket, and this has further ensured the dischargeable capacity of pocket, thereby improves the application life of system, and improves the economy of system.
Though the present invention mainly describes in conjunction with the embodiment of extraction coal-bed gas,, understand easily, the present invention is not limited to this.
Under the inspiration of the embodiment of the invention, the be not difficult channel system of the connection face of land that is drilled to directed-drilling technique and target geologic body (resource reservoir) of those skilled in the art is implemented the exploitation of fluidised form mineral products such as oil, natural gas, underground water.
By the communication passage mouth that is drilled to directed-drilling technique and the channel system of target geologic body, the present invention also can be applicable to exploration, engineering geologic investigation and the monitoring of target geologic body, the re-injection of flowing material etc.
Because described accessory channel of the present invention and described probing passage can all be arranged in the same well that comprises vertical or tilting section, curve transition section and horizontal segment, also can be respectively straight well and horizontal well, there are certain distance in the well head of this horizontal well and the well head of straight well, and comprise vertical or tilting section.Therefore, the position of passway has sufficient alternative, and the distance between two passwaies can determine according to actual conditions, can be far, can closely even can unite two into one.Therefore, the present invention is applicable to all kinds of landform (comprising the Plain and face of land area complicated and changeable), and particularly the subsurface geology under surface conditions such as hills, mountain area, river, seashore, major works, ancient buildings and human settlement is explored, reconnoitred and mining.
Description of drawings
Below in conjunction with accompanying drawing some embodiment of the present invention are elaborated.By this explanation, above-mentioned and other purpose, feature and effect of the present invention will become more obvious, wherein,
Fig. 1 is the schematic diagram of individual well bitubular mode of communicating according to an embodiment of the invention;
Fig. 2 be according to a different embodiment straight well and the schematic diagram of horizontal well mode of communicating:
Fig. 3 is a schematic diagram of arranging the sleeve pipe that easily drills through in the coal seam section according to of the present invention;
Fig. 4 is the schematic diagram that cavern is set according to of the present invention at the resource reservoir place of straight well;
Fig. 5 is that each branch horizontal well eye is positioned at two well connectivity points schematic diagram afterwards in the prior art;
Fig. 6 is that each branch horizontal well eye according to the present invention is positioned at before the two well connectivity points and schematic diagram afterwards;
Fig. 7 is the schematic diagram according to bridging plug operational mode of the present invention.
The specific embodiment
No matter be for fluid exploitation, exploration with solid sampling, engineering geology monitor, or fluid re-injection, all need at first to form the passage of target approach geologic body (reservoir).This manual claims such passage to be " probing passage ".
In order to create favourable probing and/or working condition artificially in target geologic body part, one " accessory channel " need be set, its passway is communicated with the target geologic body, helps the condition of drilling and/or producing by injection fluid (for example, air etc.) creation.
According to one embodiment of present invention, accessory channel 12 and probing passage 11 can be arranged in the same well, it is individual well bitubular pattern, wherein, as shown in Figure 1, individual well bitubular pattern is finished the inclination section 7 of a horizontal well before target approach reservoir 6, two pipes (accessory channel 12 and probing passage 11) are set in well, these two pipes are communicated with (as the perforation mode of being amplified by the part among Fig. 1) by certain mode of knowing, are communicated with the back and bore multi-branched horizontal well, well head 3 of 5 existence on the face of land.
Particularly, as shown in Figure 1, probing passage 11 has formed pocket 10 passing target reservoir 6 back continuation probings downwards.The degree of depth of this pocket 10 should be enough dark, owing to flow and be deposited on wherein landwaste with the discharging of gas, also can hold the underground water that from multi-branched horizontal well oozes out simultaneously to be contained in the gas drainage under suction process, reaches the unimpeded purpose of maintenance aerogenesis passage.
Particularly, pocket 10 not only can be the continuation extension of probing passage 11, and can be formed on other positions of multi-branched horizontal well, be equivalent to horizontal multilateral well to inferior division (as the part of the dotted line among Fig. 1 10 expression), its quantity can be several, like this, not only plays pocket, and play the drawing-off gas path, thereby help improving the gas output.
Particularly, pocket 10 can tilt, and also can be vertical.Concrete form can be selected as required.
Particularly, the degree of depth of each pocket can reach 50-80 rice usually, even reaches 150 meters or longer, and this depends on the geological conditions of target geologic body and produces needs.
In addition, thought of the present invention can apply to accessory channel 12 equally and drill the situation that passage 11 is separated from each other.Fig. 2 shows the straight well of a twin-well tube pattern embodiment and the mode of communicating between the horizontal well.This twin-well tube pattern is by multi-branched horizontal well 1 and form two well heads 3,4 of 5 existence on the face of land with it at the straight well 2 of reservoir 6 connections.
Particularly, so-called " straight well " is meant vertical in essence well, also comprises the well of the approximate vertical that is drilled to according to actual needs or the well with certain journey gradient; So-called " horizontal well " comprises the section of piercing, changeover portion and horizontal multiple-limb section, and wherein, the section of piercing can be vertical, also can tilt, and this depends primarily on the buried depth of target geologic body.
As shown in Figure 2, during drilling straight-hole, after boring saturating target reservoir, should continue down to bore enough degree of depth, in the formation bottom " pocket " 10 of straight well, it is used to collect landwaste and the underground water that oozes out, and prevents that horizontal well is blocked in the gas drainage under suction manufacturing process, also can the row of increasing adopt intensity, can enhance productivity like this.
When improvements of the present invention are to bore accessory channel or probing passage, pass the target geologic body and continue to get out a plurality of pockets downwards.
In order to prevent that pocket from caving in, after in pocket, being full of landwaste, be beneficial to cleaning, in order to create favourable working condition, be necessary to keep the stability of the pocket borehole wall.
The method of the stability of the maintenance pocket borehole wall has multiple, for example, is lowered to methods such as tail pipe.But the present invention is recommended in the reservoir section one section glass reinforced plastic sleeve 8 (as Fig. 3) is set, and all is common steel sleeve 2 in the both sides up and down of glass reinforced plastic sleeve.Like this, when horizontal well drilling, needn't carry out anti-collision, because glass reinforced plastic sleeve is easy to be drilled, to realize being communicated with of straight well and horizontal branch well.
Particularly, above-mentioned glass reinforced plastic sleeve also can be replaced by other material that drills through easily.
According to the present invention, do a cavern 15 (as Fig. 4) at the reservoir place of straight well, be communicated with so that realize two wells.
In order to realize that two wells directly are communicated with, at first want the track of controlling level well main borehole, make it to be communicated with the cave of straight well, continue to finish main horizontal hole and each branch well hole then.As shown in Figure 5, in the prior art, each branch horizontal well eye is positioned at after the two well connectivity points.And according to the present invention, as shown in Figure 6, some branch horizontal well eye is positioned at before the two well connectivity points, and some branch horizontal well eye is positioned at after the two well connectivity points, and like this, fully the combined ground orographic condition is selected the position of straight well, to realize best economy.
Particularly, as shown in Figure 7, exempt from obstruction, drillable bridging plug (or recoverable packer) 20 can be set in a distance under the target reservoir 6 in order to make " pocket " that formed, and then the worker cave that makes children at the target reservoir place.After artificial cave forms, horizontal well is communicated with the cave of straight well.
Particularly, if the landwaste on the bridging plug 20 is few, volume that can appreciable impact pocket 10 before beginning extraction coal-bed gas, can directly bore bridging plug, makes that pocket 10 is open-minded, like this more convenient operation.
On the contrary, if the landwaste on the bridging plug 20 is a lot,, before beginning extraction coal-bed gas, should make that pocket 10 is open-minded, to guarantee the unimpeded for a long time of aerogenesis passage by bridging plug being shifted out straight well with the volume of appreciable impact pocket 10.
In addition, according to the present invention, for the multiple target reservoir, available less well is carried out development of resources.According to the topography and geomorphology at place, passway and the principle of saving cost, a straight well, a plurality of horizontal well can be set; A plurality of straight wells, a horizontal well also can be set; Maybe multiple situations such as a plurality of straight wells, a plurality of horizontal wells can be set.
Multi-branched horizontal well is after next target reservoir is finished, come into effect the operation of a target reservoir, with recoverable packer setting a distance at the bottom of target reservoir second from the bottom, manually make the cave as the method for front at this target reservoir then.After finish in artificial cave, from main borehole, carry out sidetracking, so that be communicated with the cave.
Can adopt the sidetracking technology to continue deflecting, carry out then and being communicated with of accessory channel to target reservoir.If do not adopt the way of sidetracking, also can adopt many wells scheme, for example, bore two mouthfuls of water horizontal wells, only bore a bite straight well.Horizontal well is communicated with the cave of corresponding straight well respectively, and then bores multi-branched horizontal well respectively in each target reservoir.
Similarly, can bore two mouthfuls of straight wells, only bore the water horizontal well.Horizontal well is communicated with the cave of corresponding straight well respectively, and then bores multi-branched horizontal well respectively in each target reservoir.
Particularly, if target reservoir more than two, can upwards successively be drilled successively from next target reservoir.
Particularly, be positioned in the target geologic body under the situation of the more shallow or super shallow position of underground, the vertical section of horizontal well can make tilting section into, like this, is more convenient for boring each branch of horizontal segment.
In a word, during the operation of twin-well tube, need 2 blocks of soils of requisition, the workload and the cost of aspects such as expropriation of land, well site and road construction are all very big; For guaranteeing that two wells are communicated with needed technical costs and setting up cost is also very high.
If can adopt individual well bitubular pattern, can further reduce cost.Can in the straight well section of horizontal well and inclination section, only be lowered to single sleeve pipe or two-tube.Be lowered to when two-tube, boring before horizontal segment main borehole and the multilateral well two pipe connections.When creeping into, just can create favourable probing condition.
System according to target approach geologic body of the present invention can be used for exploration equally, reconnoitres or monitor purpose, by drilling passage and horizontal main borehole and/or branch well hole pickup device or sensing element is arranged on the position that needs, and just can achieve the goal.
Abovely the present invention is had been described in detail in conjunction with various embodiments; however; should be appreciated that; under design of the present invention inspires; those skilled in the art also can carry out such-and-such modification, replenish, change the present invention; yet these can not exceed spirit and the protection domain that claims of the present invention limit.
Claims (22)
1. the method for a target approach geologic body, it comprises:
Accessory channel is set, partly produces favourable probing condition in the target geologic body thereby inject fluid by this passage;
The probing passage is set, and it is communicated with above target geologic body place or its with described accessory channel;
It is characterized in that:
When boring accessory channel or probing passage, pass the target geologic body and continue to get out a plurality of pockets downwards from a probing passage;
In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage;
Described accessory channel and described probing passage all are arranged in the same well.
2. the method for target approach geologic body as claimed in claim 1 is characterized in that: described same well comprises vertical or tilting section, curve transition section and horizontal segment.
3. the method for target approach geologic body as claimed in claim 1 is characterized in that, along the direction of boring horizontal main borehole, all gets out some branch well holes in described accessory channel and the place ahead at described probing channel connection place and the appropriate position at rear.
4. the method for target approach geologic body as claimed in claim 3 is characterized in that, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.
5. the method for a target approach geologic body, it comprises:
Accessory channel is set, partly produces favourable probing condition in the target geologic body thereby inject fluid by this passage;
The probing passage is set, and it is communicated with above target geologic body place or its with described accessory channel;
It is characterized in that:
When boring accessory channel or probing passage, pass the target geologic body and continue to get out a plurality of pockets downwards from a probing passage;
In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage;
Described accessory channel is positioned at different wells with the probing passage, and corresponding to target geologic body position the sleeve portion that easily drills through is set at accessory channel.
6. the method for target approach geologic body as claimed in claim 5 is characterized in that, described accessory channel is a straight well, and in its resource reservoir position artificial cave is set; Described probing passage is to begin the vertical or tilting section of horizontal well drilling with straight well well head one segment distance place, towards place, straight well cave direction deflecting, horizontal well is communicated with in a certain appropriate position with straight well at the place, cave.
7. the method for target approach geologic body as claimed in claim 5 is characterized in that, along the direction of boring horizontal main borehole, all gets out some branch well holes in described accessory channel and the place ahead at described probing channel connection place and the appropriate position at rear.
8. the method for target approach geologic body as claimed in claim 7 is characterized in that, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.
9. the method for target approach geologic body as claimed in claim 6 is characterized in that, the described sleeve portion two ends that easily drill through are ordinary casing, and the length of the described sleeve portion that easily drills through is more than or equal to the height in artificial cave; The described sleeve portion that easily drills through in the handshaking procedures of horizontal well and straight well or before partly or entirely bored.
10. as the method for each described target approach geologic body of claim 5-9, it is characterized in that the described sleeve portion that easily drills through is the fiber glass reinforced plastic cover tube portion.
11. the method for target approach geologic body as claimed in claim 6 is characterized in that, when making children the worker cave, the removable bridging plug that maybe can bore is set in described pocket.
12. the system of a target approach geologic body, it comprises:
Accessory channel partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body;
The probing passage, it is communicated with above target geologic body place or its with described accessory channel;
It is characterized in that:
The a plurality of pockets that pass the target geologic body and extend downwards that when boring accessory channel or probing passage, get out from a probing passage;
In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage;
Described accessory channel and described probing passage all are arranged in the same well.
13. the system of target approach geologic body as claimed in claim 12 is characterized in that: described same well comprises vertical or tilting section, curve transition section and horizontal segment.
14. the system of target approach geologic body as claimed in claim 12 is characterized in that, along the direction of boring horizontal main borehole, all gets out some branch well holes in described accessory channel and the place ahead at described probing channel connection place and the appropriate position at rear.
15. the system of target approach geologic body as claimed in claim 14 is characterized in that, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.
16. the system of a target approach geologic body, it comprises:
Accessory channel partly produces favourable probing condition thereby inject fluid by this passage in the target geologic body;
The probing passage, it is communicated with above target geologic body place or its with described accessory channel; It is characterized in that:
The a plurality of pockets that pass the target geologic body and extend downwards that when boring accessory channel or probing passage, get out from a probing passage;
In the target geologic body, get out and drill horizontal main borehole that passage is connected and the some branch well holes that are communicated with horizontal main borehole by the probing passage;
Described accessory channel is positioned at different wells with the probing passage, and corresponding to target geologic body position the sleeve portion that easily drills through is set at accessory channel.
17. the system of target approach geologic body as claimed in claim 16 is characterized in that, described accessory channel is a straight well, and in its resource reservoir position artificial cave is set; Described probing passage is to begin brill level vertical or tilting section also with straight well well head one segment distance place, towards place, straight well cave direction deflecting, horizontal well is communicated with in a certain appropriate position with straight well at the place, cave.
18. the system of target approach geologic body as claimed in claim 16 is characterized in that, along the direction of boring horizontal main borehole, all gets out some branch well holes in described accessory channel and the place ahead at described probing channel connection place and the appropriate position at rear.
19. the system of target approach geologic body as claimed in claim 18 is characterized in that, the probing direction of described some branch well holes comprises towards front left side and/or forward right side, and/or comprises front side and/or front side up down.
20. the system of target approach geologic body as claimed in claim 17 is characterized in that, the described sleeve portion two ends that easily drill through are ordinary casing, and the length of the described sleeve portion that easily drills through is more than or equal to the height in artificial cave; The described sleeve portion that easily drills through in the handshaking procedures of horizontal well and straight well or before partly or entirely bored.
21. the system as each described target approach geologic body of claim 16-20 is characterized in that, the described sleeve portion that easily drills through is the fiber glass reinforced plastic cover tube portion.
22. the system of target approach geologic body as claimed in claim 17 is characterized in that, when making children the worker cave, the removable bridging plug that maybe can bore is set in described pocket.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510058991XA CN1317483C (en) | 2005-03-25 | 2005-03-25 | Method of entering target geologic body and system |
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| CNB200510058991XA CN1317483C (en) | 2005-03-25 | 2005-03-25 | Method of entering target geologic body and system |
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| CN1317483C true CN1317483C (en) | 2007-05-23 |
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| CN101806207A (en) * | 2010-04-26 | 2010-08-18 | 徐萍 | Horizontal well three-dimensional intersection well pattern structure |
| CN101818620B (en) * | 2010-04-26 | 2013-04-10 | 徐萍 | Mining method for maximum reservoir contact well |
| CN101963052B (en) * | 2010-09-10 | 2013-01-09 | 北京奥瑞安能源技术开发有限公司 | Method for cleaning sediment in vertical well pocket in process of coalbed methane exploitation |
| CN101994505B (en) * | 2010-09-17 | 2013-01-09 | 北京奥瑞安能源技术开发有限公司 | Drilling construction method by cooperation of horizontal wells and extraction straight wells for coal bed methane in multiple objective layers |
| CN101979816B (en) * | 2010-09-17 | 2012-11-14 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas horizontal well and drainage-mining straight well combined well drilling construction method |
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| CN107217987A (en) * | 2017-05-27 | 2017-09-29 | 中国石油集团渤海钻探工程有限公司 | Colliery flood administers well boring method |
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