CN113153146A - Communicated horizontal well and drilling method thereof - Google Patents
Communicated horizontal well and drilling method thereof Download PDFInfo
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- CN113153146A CN113153146A CN202110015182.XA CN202110015182A CN113153146A CN 113153146 A CN113153146 A CN 113153146A CN 202110015182 A CN202110015182 A CN 202110015182A CN 113153146 A CN113153146 A CN 113153146A
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- 238000005553 drilling Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000010276 construction Methods 0.000 claims description 15
- 239000003245 coal Substances 0.000 claims description 14
- 239000003550 marker Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 abstract description 11
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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Abstract
The invention provides a communicated horizontal well and a drilling method thereof. This intercommunication horizontal well includes: the first horizontal well comprises a first straight well section, a first deflecting section and a first horizontal section which are sequentially connected; the second horizontal well comprises a second straight well section, a second deflecting section and a second horizontal section which are sequentially connected, the tail end of the second horizontal section is connected with the first horizontal section, the horizontal plane where the connected joints are located is a first horizontal plane, and the second horizontal section and the first horizontal section from the first deflecting section to the joints are arranged on the upper side and the lower side of the first horizontal plane. Connecting the end of the second horizontal segment with the first horizontal segment ensures effective connection of the two horizontal segments, achieving effective growth of the horizontal segments on the basis of longitudinal drilling. The second horizontal section and the first horizontal section from the first deflecting section to the joint are arranged on the upper side and the lower side of the first horizontal plane, and the whole inclined directions of the first horizontal section and the second horizontal section after connection are consistent, so that two horizontal wells can share one set of discharging and mining equipment.
Description
Technical Field
The invention relates to the technical field of horizontal well drilling, in particular to a communicated horizontal well and a drilling method thereof.
Background
Along with the continuous deepening of coal bed gas development, the application of the horizontal well technology is more and more common, the horizontal well technology gradually becomes a conventional technology, and unique effects and advantages are shown. The longer the horizontal well section, the more obvious the economic and technical advantages are exhibited. But is limited by the friction resistance of the well bore, and the length of the horizontal section is relatively fixed, thereby influencing the development economy to a certain extent. The conventional U-shaped well is communicated with a vertical well at present, the distance between the horizontal well and the vertical well is 1000-1200 m, and the length of a horizontal section of the horizontal well cannot be effectively increased.
The patent with the publication number of CN 205314977U discloses a well pattern structure and a coal mine gas extraction system, wherein the well pattern structure is communicated with two remote horizontal wells, the well pattern structure is composed of two horizontal wells, the two horizontal wells are respectively a first horizontal well and a second horizontal well, one end of a horizontal section of the first horizontal well is communicated with one end of a horizontal section of the second horizontal well, the other end of the horizontal section of the first horizontal well is communicated with a vertical section of the first horizontal well, the other end of the horizontal section of the second horizontal well is communicated with a vertical section of the second horizontal well, and the horizontal section of the first horizontal well and the horizontal section of the second horizontal well are located on the same straight line. The well pattern structure communicated with the two long-distance horizontal wells is communicated with the two horizontal wells, so that the length of the horizontal well is doubled, the coal mining surface is completely covered, and the gas extraction efficiency is improved. However, the two horizontal sections of the two horizontal wells are located on the same horizontal plane, which causes difficulty in drainage and mining of the horizontal wells and is not suitable for longitudinal development of coal bed methane.
Disclosure of Invention
The invention mainly aims to provide a communicating horizontal well and a drilling method thereof, so as to further improve the extension length of a horizontal section of the horizontal well.
In order to achieve the above object, according to an aspect of the present invention, there is provided a communicating horizontal well comprising: the first horizontal well comprises a first straight well section, a first deflecting section and a first horizontal section which are sequentially connected; the second horizontal well comprises a second straight well section, a second deflecting section and a second horizontal section which are sequentially connected, the tail end of the second horizontal section is connected with the first horizontal section, the horizontal plane where the connected joints are located is a first horizontal plane, and the second horizontal section and the first horizontal section from the first deflecting section to the joints are arranged on the upper side and the lower side of the first horizontal plane.
Further, the distance between the connecting joint and the end of the first horizontal segment is greater than 0m and less than or equal to 30m, preferably greater than or equal to 10m and less than or equal to 30 m.
Furthermore, the first horizontal section between the tail end of the first horizontal section and the connecting point is a positioning horizontal section, the included angle between the positioning horizontal section and the second horizontal section is alpha, and alpha is more than or equal to 15 degrees and less than or equal to 80 degrees.
Furthermore, the horizontal plane of the connecting joint is a first horizontal plane, the first horizontal section from the first inclined section to the joint is above the first horizontal plane and inclines downwards, and the second horizontal section is below the first horizontal plane and inclines upwards from the second inclined section to the tail end.
Furthermore, the horizontal plane of the connecting joint is a first horizontal plane, the first horizontal section from the first deflecting section to the joint is below the first horizontal plane and inclines upwards, and the second horizontal section is above the first horizontal plane and inclines downwards from the second deflecting section to the tail end.
Furthermore, the length of the first horizontal section is 900-1100 m, and the length of the second horizontal section is 800-1000 m.
According to another aspect of the present invention, there is provided a method of drilling a communicating horizontal well as any one of the above, the method comprising: setting a common target point of a first horizontal well and a second horizontal well; constructing a first horizontal well, drilling a first straight well section, a first deflecting section and a first horizontal section of the first horizontal well, and continuously drilling for a preset distance when the first horizontal section is drilled to a common target point position; and constructing a second horizontal well, drilling a second straight well section, a second deflecting section and a second horizontal section of the second horizontal well, and connecting the tail end of the second horizontal section with the first horizontal section, wherein the inclination direction of the well hole of the first horizontal section is opposite to that of the well hole of the second horizontal section.
Furthermore, the drilling tool assembly adopted in the construction comprises a near-bit LWD logging-while-drilling instrument, and the borehole trajectory is adjusted according to the measurement result of the near-bit LWD logging-while-drilling instrument in the construction process.
Further, in the first horizontal well construction process, when the first horizontal section drills to the common target point position, the near-bit LWD logging-while-drilling instrument controls the wellbore trajectory of the first horizontal section to continue drilling at the position of the marker layer of the coal seam for a predetermined distance, and preferably, the predetermined distance is greater than 0m and less than or equal to 30 m.
Further, in the process of constructing the second horizontal well, when the drill bit is 10-30 m away from the common target point, the near-bit LWD logging-while-drilling instrument is used for adjusting the well track of the second horizontal section to continuously drill at the position of the marked layer of the coal bed along the same vertical direction as the well of the first horizontal section.
Further, after the first horizontal well is constructed, the first screen pipe is lowered to the common target point position of the first horizontal well, and then the first horizontal well is completed; and after the second horizontal well is constructed, a second screen pipe is put to the bottom of the second horizontal well, and then the second horizontal well is completed.
By applying the technical scheme of the invention, the tail end of the second horizontal section is connected with the first horizontal section, namely, the horizontal point-to-point connection is converted into the connection of the longitudinal upper point to the line, so that the effective connection of the two horizontal sections is ensured, and the effective growth of the horizontal sections is realized on the basis of longitudinal drilling. In addition, the second horizontal section and the first horizontal section from the first deflecting section to the joint are arranged on the upper side and the lower side of the first horizontal plane, so that the two horizontal wells can be normally arranged and mined, and the integral inclination directions of the first horizontal section and the second horizontal section after connection are consistent, so that the two horizontal wells can share one set of arrangement and mining equipment, for example, the arrangement and mining equipment is arranged in the horizontal well with low altitude so as to undertake the arrangement and mining tasks of the two wells, and the arrangement and mining cost is effectively reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic view of a connection structure of communication wells according to some embodiments of the invention; and
FIG. 2 shows a schematic vertical view of a communication well according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of the connection of two horizontal segments according to one embodiment of the invention.
Wherein the figures include the following reference numerals:
10. a first horizontal well; 11. a first straight well section; 12. a first deflecting section; 13. a first horizontal segment;
20. a second horizontal well; 21. a second straight well section; 22. a second deflecting section; 23. a second horizontal segment;
30. a contact point; 40. a first sieve tube; 50. a second screen.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As analyzed by the background of the present application, horizontal sections of horizontal wells in the prior art have difficulty extending the length over longitudinal drilling techniques. The applicant analyzes the existing horizontal section connection technology of the same horizontal plane, and finds that the connection of the same horizontal section is relatively easy to realize the regulation and the connection of the well track by adopting a magnetic positioning instrument. However, when two horizontal sections located at different horizontal planes are connected, the magnetic positioning instrument cannot effectively transmit and receive longitudinal signals of the stratum, so that the well tracks of the horizontal sections at different horizontal planes cannot be effectively positioned and regulated, and the two horizontal sections are difficult to effectively connect.
In order to solve the problem, the application provides a communicating horizontal well and a drilling method thereof. In an exemplary embodiment of the present application, a communicating horizontal well is provided, as shown in fig. 1 and 2, the communicating horizontal well includes a first horizontal well 10 and a second horizontal well 20, the first horizontal well 10 includes a first straight well section 11, a first deflecting section 12 and a first horizontal section 13 which are connected in sequence; the second horizontal well 20 comprises a second straight well section 21, a second deflecting section 22 and a second horizontal section 23 which are sequentially connected, the tail end of the second horizontal section 23 is connected with the first horizontal section 13, the horizontal plane of the connected joint 30 is a first horizontal plane, and the second horizontal section 23 and the first horizontal section 13 from the first deflecting section 12 to the joint 30 are arranged on the upper side and the lower side of the first horizontal plane.
This application is connected the end and the first horizontal segment 13 of second horizontal segment 23, is about to the point-to-point connection of level converts the connection of vertical upward point to the line, has guaranteed the effective connection of two horizontal segments to realize the effective increase of horizontal segment on vertical probing basis. In addition, the second horizontal section 23 and the first horizontal section 13 from the first deflecting section 12 to the joint 30 are arranged on the upper side and the lower side of the first horizontal plane, so that the two horizontal wells can be normally arranged and mined, and the integral inclination directions of the first horizontal section 13 and the second horizontal section 23 after connection are consistent, so that the two horizontal wells can share one set of arrangement and mining equipment, for example, the arrangement and mining equipment is arranged and mined in the horizontal well with low altitude so as to undertake the arrangement and mining tasks of the two wells, and the arrangement and mining cost is effectively reduced.
Above-mentioned intercommunication horizontal well is when being under construction, the drilling tool assembly that the construction adopted includes nearly drill bit LWD logging while drilling instrument, and adjust the well orbit according to the measuring result of nearly drill bit LWD logging while drilling instrument in the work progress, nearly drill bit LWD logging while drilling instrument can receive the well orbit parameter of being close the shaft bottom, use the deflecting tool control well position in the drilling tool assembly according to the survey parameter, creep into along the direction of predetermineeing, nearly drill bit measured data uploads in real time, judge out the well position in the very first time, when the orbit skew condition appears, in time adjustment, make the orbit be in controllable state always. In an embodiment of the present application, in order to further improve the connection reliability, the distance between the contact 30 of the connection and the end of the first horizontal segment 13 is preferably greater than 0m and less than or equal to 30m, and preferably greater than or equal to 10m and less than or equal to 30 m.
In actual drilling, the wellhead positions of two horizontal wells can be set according to the formation conditions or the coal seam positions, for example, the first horizontal section 13 between the tail end of the first horizontal section 13 and the connecting point 30 is a positioning horizontal section, the included angle between the positioning horizontal section and the second horizontal section 23 is alpha, and alpha is more than or equal to 15 degrees and less than or equal to 80 degrees. In particular, reference may be made to FIG. 1, wherein three patterns are shown.
The specific well distribution mode for communicating two horizontal wells in the horizontal well can be designed according to actual requirements, for example, the horizontal plane where the connected joint 30 is located is a first horizontal plane, the first horizontal section 13 from the first deflecting section 12 to the joint 30 is above the first horizontal plane and is inclined downwards, and the second horizontal section 23 is below the first horizontal plane and is inclined upwards from the second deflecting section 22 to the tail end. Or the horizontal plane of the connected joint 30 is a first horizontal plane, the first horizontal section 13 from the first deflecting section 12 to the joint 30 is below the first horizontal plane and inclines upwards, and the second horizontal section 23 is above the first horizontal plane and inclines downwards from the second deflecting section 22 to the tail end. In any well placement method, the well placement can be realized by the current drilling technology, and the description is not provided herein.
Because the two horizontal wells are drilled respectively, the length of each horizontal section can be designed according to the length of the horizontal section of a conventional horizontal well, preferably, the length of the first horizontal section 13 is 900-1100 m, and the length of the second horizontal section 23 is 800-1000 m.
The following embodiments describe a method of drilling a communicating horizontal well, the method comprising: setting a common target point of a first horizontal well 10 and a second horizontal well 20; constructing a first horizontal well 10, drilling a first straight well section 11, a first deflecting section 12 and a first horizontal section 13 of the first horizontal well 10, and continuously drilling for a preset distance when the first horizontal section 13 is drilled to a common target point position; and constructing a second horizontal well 20, drilling a second straight well section 21, a second deflecting section 22 and a second horizontal section 23 of the second horizontal well 20, connecting the tail end of the second horizontal section 23 with the first horizontal section 13, wherein the drilling inclination direction of the first horizontal section 13 is opposite to that of the second horizontal section 23. The first horizontal segment 13 and the second horizontal segment 23 are joined at a common target point using the method described above.
The drilling tool assembly adopted by the preferable construction comprises a near-bit LWD logging-while-drilling instrument, and the well track is adjusted according to the test result of the near-bit LWD logging-while-drilling instrument in the construction process.
The drilling tool combination adopted by the application comprises a near-bit LWD logging-while-drilling instrument, the well track is adjusted according to the test result of the near-bit LWD logging-while-drilling instrument in the construction process, the vertical accurate position of the well is guaranteed, and therefore a reliable data base is provided for connection of two horizontal sections.
In order to improve the drilling efficiency and reduce the drilling cost, preferably, in the process of constructing the first horizontal well 10, when the first horizontal section 13 is drilled to the common target point position, the near-bit LWD logging-while-drilling instrument controls the borehole trajectory of the first horizontal section 13 to continue drilling at the position of the marker layer of the coal seam for a predetermined distance, preferably, the predetermined distance is 0-50 m, and preferably, 0-30 m. In the construction process of the first horizontal well 10, a conventional drilling mode and a conventional positioning mode can be adopted when a straight well section and a deflecting section are drilled. When the first horizontal section 13 is drilled, a conventional mode or a near-bit LWD logging-while-drilling instrument can be used for positioning, when the first horizontal section 13 is drilled to a common target position, the near-bit LWD logging-while-drilling instrument is used for controlling the position of a well track of the first horizontal section 13 at a mark layer of a coal bed so as to determine the vertical accurate position of the well, then, the drilling is continued for a preset distance, namely, after the drilling is carried out to the common target position, the drilling is continued to drill out redundant horizontal sections.
In some embodiments, the second horizontal well 20 may be constructed in a conventional manner, and preferably, during the construction of the second horizontal well 20, the near-bit LWD logging while drilling tool is used to adjust the borehole trajectory of the second horizontal segment 23 to continue drilling along the same vertical direction as the borehole of the first horizontal segment 13 at the position of the marker layer of the coal seam when the drill bit is 10-50 m away from the common target point. Thereby realizing the connection of the first horizontal segment 13 and the second horizontal segment 23 at the common target point position.
In order to ensure the stability of the first horizontal well 10 and the second horizontal well 20, the well drilling method preferably completes the well of the first horizontal well 10 after the first screen pipe 40 is lowered to the common target point position of the first horizontal well 10 after the first horizontal well 10 is constructed; after the second horizontal well 20 is completed, a second screen 50 is run into the bottom of the second horizontal well 20 and the second horizontal well 20 is completed.
The following illustrates a method of drilling a communicating horizontal well to facilitate the practice of the drilling method of the present application by one skilled in the art.
The process method comprises two horizontal wells, and the length of each horizontal section can be set according to geological requirements, and is generally about 1000 m. The main process flow is as follows:
1) constructing a first horizontal well 10, drilling to a target point T position, drilling D points after continuously drilling for 30m, wherein the drilling tool assembly comprises a near-bit LWD logging-while-drilling instrument, and controlling a track to pass through the position of a mark layer in a coal seam by the near-bit LWD logging-while-drilling instrument after drilling to the target point T position so as to determine the vertical accurate position of a well hole;
2) the first screen 40 is lowered to 30m from the bottom of the well, and the first horizontal well 10 is completed;
3) the drilling direction of the second horizontal well 20 takes a target point T as a target point (see figure 3), the second horizontal well 20 is constructed, the target point T is drilled to 30m before the target point T of the first horizontal well 10, the drilling along the coal seam marker layer in the vertical direction of the well track is adjusted, and the well track of the first horizontal well 10 are in the same vertical position;
4) the communication point of the second horizontal well 20 and the first horizontal well 10 is at a target point T, and the position with clear logging curve characteristics is preferably selected;
5) a second screen pipe 50 is put into the second horizontal well 20, and the well is completed;
6) and (4) putting the drainage and production equipment in a well with low altitude, and performing drainage and production operation on two horizontal wells together.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A communicating horizontal well, comprising:
the horizontal well comprises a first horizontal well (10), wherein the first horizontal well (10) comprises a first straight well section (11), a first deflecting section (12) and a first horizontal section (13) which are sequentially connected;
the horizontal well comprises a second horizontal well (20), wherein the second horizontal well (20) comprises a second straight well section (21), a second deflecting section (22) and a second horizontal section (23) which are sequentially connected, the tail end of the second horizontal section (23) is connected with the first horizontal section (13), the horizontal plane where the connected joint (30) is located is a first horizontal plane, and the second horizontal section (23) and the first deflecting section (12) are connected with the first horizontal section (13) between the joints (30) and are arranged on the upper side and the lower side of the first horizontal plane.
2. Communicating horizontal well according to claim 1, characterized in that the distance of the joint (30) of the connection from the end of the first horizontal section (13) is greater than 0m and less than or equal to 30m, preferably greater than or equal to 10m and less than or equal to 30 m.
3. The horizontal communicating well according to claim 1, wherein the first horizontal segment (13) between the end of the first horizontal segment (13) and the connection point (30) is a positioning horizontal segment, and the included angle between the positioning horizontal segment and the second horizontal segment (23) is alpha, and alpha is more than or equal to 15 degrees and less than or equal to 80 degrees.
4. A communicating horizontal well according to claim 1 wherein the level of the joint (30) of the connection is a first level, the first horizontal section (13) from the first deflecting section (12) to the joint (30) is above and inclined downwards, and the second horizontal section (23) is below and inclined upwards from the second deflecting section (22) to the terminal end.
5. A communicating horizontal well according to claim 1 wherein the level of the joint (30) of the connection is a first level, the first horizontal section (13) from the first deflecting section (12) to the joint (30) is below the first level and slopes upwardly, and the second horizontal section (23) is above the first level and slopes downwardly from the second deflecting section (22) to the terminal end.
6. The communicated horizontal well according to claim 1, wherein the first horizontal segment (13) has a length of 900-1100 m and the second horizontal segment (23) has a length of 800-1000 m.
7. A method of drilling a communicating horizontal well according to any one of claims 1 to 6 comprising:
setting a common target point of a first horizontal well (10) and a second horizontal well (20);
constructing a first horizontal well (10), drilling a first straight well section (11), a first deflecting section (12) and a first horizontal section (13) of the first horizontal well (10), and continuing to drill for a preset distance when the first horizontal section (13) is drilled to the common target point position;
constructing a second horizontal well (20), drilling a second straight well section (21), a second deflecting section (22) and a second horizontal section (23) of the second horizontal well (20), connecting the tail end of the second horizontal section (23) with the first horizontal section (13), wherein the inclination direction of the well bore of the first horizontal section (13) is opposite to that of the well bore of the second horizontal section (23),
preferably, the drilling tool assembly adopted for construction comprises a near-bit LWD logging-while-drilling instrument, and the borehole trajectory is adjusted according to the measurement result of the near-bit LWD logging-while-drilling instrument in the construction process.
8. Drilling method according to claim 7, wherein during the construction of the first horizontal well (10), the drilling of the first horizontal section (13) is continued at the position of the marker layer of the coal seam by controlling the wellbore trajectory of the first horizontal section (13) by the near-bit LWD logging-while-drilling tool when the first horizontal section (13) is drilled to the common target point position, for a predetermined distance, preferably the predetermined distance is greater than 0m and less than or equal to 30 m.
9. The drilling method as claimed in claim 7, wherein during the construction of the second horizontal well (20), when the drill bit is 10-30 m before the common target point, the near-bit LWD logging-while-drilling instrument adjusts the borehole trajectory of the second horizontal segment (23) to continue drilling at the position of the marked layer of the coal seam along the same vertical direction as the borehole of the first horizontal segment (13).
10. Drilling method according to claim 7, wherein it is completed after having run a first screen (40) to the common target point of the first horizontal well (10) after completion of the construction of the first horizontal well (10); and after the second horizontal well (20) is constructed, a second screen pipe (50) is lowered to the bottom of the second horizontal well (20), and then the second horizontal well (20) is completed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114909119A (en) * | 2022-04-29 | 2022-08-16 | 大庆辰平钻井技术服务有限公司 | Drilling method for converting original vertical well or inclined well into U-shaped geothermal well with ultra-short radius |
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| US20060266517A1 (en) * | 2003-06-09 | 2006-11-30 | Stayton Robert J | Method for drilling with improved fluid collection pattern |
| US20060124360A1 (en) * | 2004-11-19 | 2006-06-15 | Halliburton Energy Services, Inc. | Methods and apparatus for drilling, completing and configuring U-tube boreholes |
| CN101713286A (en) * | 2009-11-04 | 2010-05-26 | 中国石油大学(北京) | Electromagnetic system for detecting distance between adjacent wells while drilling |
| CN102979498A (en) * | 2012-11-12 | 2013-03-20 | 中国石油天然气股份有限公司 | Coal bed gas multi-branch horizontal well system |
| CN103161440A (en) * | 2013-02-27 | 2013-06-19 | 中联煤层气国家工程研究中心有限责任公司 | Single-well coalbed methane horizontal well system and finishing method thereof |
| CN103867124A (en) * | 2013-05-31 | 2014-06-18 | 华北石油管理局 | CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal structure |
| CN205314977U (en) * | 2016-01-21 | 2016-06-15 | 陕西兴和鹏石油工程技术服务有限公司 | Well pattern structure and colliery gas drainage system of two mouthfuls of remote horizontal well intercommunications |
| CN106640018A (en) * | 2016-11-02 | 2017-05-10 | 中国石油化工股份有限公司 | Method for mining coalbed gas through V-shaped well set |
| CN108086957A (en) * | 2017-12-23 | 2018-05-29 | 山西蓝焰煤层气集团有限责任公司 | A kind of method of the U-shaped coal bed gas well construction in double coal seams |
| CN109162678A (en) * | 2018-11-08 | 2019-01-08 | 中国神华能源股份有限公司 | Coal bed gas pumping method |
| CN111980643A (en) * | 2020-09-01 | 2020-11-24 | 中联煤层气有限责任公司 | Coal bed gas horizontal well construction method and coal bed gas horizontal well |
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| CN114909119A (en) * | 2022-04-29 | 2022-08-16 | 大庆辰平钻井技术服务有限公司 | Drilling method for converting original vertical well or inclined well into U-shaped geothermal well with ultra-short radius |
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