WO2016208050A1

WO2016208050A1 - Downhole compressor, resource recovery system and method for handling resource recovery system

Info

Publication number: WO2016208050A1
Application number: PCT/JP2015/068445
Authority: WO
Inventors: 青池　聡
Original assignee: 株式会社日立製作所
Priority date: 2015-06-26
Filing date: 2015-06-26
Publication date: 2016-12-29

Abstract

The present invention addresses the problem of reducing the work time required to replace a compressor and improving the operation rate of a wellhead. In order to solve said problem, the present invention is characterized by comprising: a double-walled pipe that is constituted from an outer tube and an inner tube, and extends from above the ground to a wellhead that is below the ground; a compressor that is installed in the wellhead inside the inner tube of the double-walled pipe, and pressurizes a fluid; an energy supply source that supplies energy; a first energy transmission mechanism that is provided in the double-walled pipe, and transmits energy using a non-contact method; a second energy transmission mechanism that is provided in the compressor, and transfers, using a non-contact method, the energy transmitted from the first energy transmission mechanism; and a cable that electrically connects the energy supply source and the first energy transmission mechanism.

Description

Downhole compressor, resource recovery system, and method of handling resource recovery system

The present invention relates to a downhole compressor installed underground, a resource recovery system that supplies power to the compressor from the ground, and a method of handling the resource recovery system.

Oil and natural gas are buried in the formation where the impermeable bedrock layer is curved, and there are many wells (oil fields and gas fields) buried at a depth of 1000 m or more from the ground. To do. In oil and natural gas wells, the pressure of the buried formations (buried formations) is high, so oil and natural gas often blow out from the vertical holes communicating from the ground to the buried formations. However, as production progresses and the amount of reserves decreases, the pressure of the buried layer decreases and self-injection stops. For this reason, measures such as introducing a compressor deep underground in the vertical hole to increase the pressure of the surrounding fluid and ejecting oil and natural gas to the ground are being taken.

In Patent Document 1, in order to transfer a liquid or a gas medium to the ground, a turbo pump is arranged in a transfer pipe connected to, for example, a well at a depth of 2000 m or more in a vertical hole communicating from the ground to the buried layer. A system for transferring a liquid or gas medium to the ground by driving a pump is described. The turbo pump is powered by a cable connected from the ground.

US Pat. No. 5,394,823

In Patent Document 1, a wired power cable is physically connected to a compressor that is inserted deep underground in a vertical hole, and power is supplied from a ground power source. When the vertical hole is a double pipe composed of an outer cylinder and an inner cylinder, the feeding cable is band-fixed to the outer surface of the inner cylinder of the double pipe at a constant pitch, and at the compressor installation position, the inner pipe is compressed. Must be physically connected to the machine. For this reason, for example, when the compressor breaks down, the replacement of the compressor must be performed together with the replacement of the double pipe inner cylinder. The underground temperature increases as the depth from the ground increases. For this reason, when the buried layer in which oil or natural gas is buried has a depth of 1000 m or more from the ground, the buried layer becomes a high temperature environment exceeding 100 ° C. Furthermore, since oil fields and natural gas fields contain corrosive gases such as hydrogen sulfide, the buried layer is a severe corrosive environment. For this reason, compressors installed in inner cylinders that become oil and natural gas flow paths and are exposed to severe corrosive environments are considered to have a high risk of failure due to corrosion. Is assumed to be expensive.

Furthermore, it is most effective to improve the operating rate at the well site by shortening the construction time required to replace the compressor, which is a high risk of failure. Is strongly desired.

This invention is made in view of the said subject, The objective is to shorten the construction time required for replacement | exchange of a compressor, and to improve the operation rate of a well source.

In order to solve this problem, the present invention is configured by a double pipe configured from an outer cylinder and an inner cylinder and communicating from the ground to an underground well base, and is installed in the well base inside the inner pipe of the double pipe. A compressor for boosting fluid; an energy supply source for supplying energy; a first energy transmission mechanism provided in the double pipe for transmitting energy in a non-contact manner; and the first energy provided in the compressor. It is characterized by comprising a second energy transmission mechanism for exchanging energy transmitted from the transmission mechanism in a non-contact manner, and a cable for electrically connecting the energy supply source and the first energy transmission mechanism.

According to the present invention, since the compressor replacement period can be greatly shortened, the operating rate of the well source can be improved.

The figure explaining the outline | summary of the wireless electric power feeding system which supplies electric power to the compressor installed in a basement by a non-contact system. The figure explaining the method of installing the compressor in a wireless power supply system in the basement. The figure explaining the method to install and fix the compressor in a radio | wireless electric power feeding system underground. The figure explaining the state which fixed the compressor in a radio | wireless electric power feeding system to the underground. The figure explaining a part of detailed structure of a compressor fixing mechanism and a double pipe inner cylinder. The figure explaining a part of detailed structure of the compressor fixing mechanism and double pipe inner cylinder of another system. The figure explaining a part of detailed structure of a compressor and a compressor transfer apparatus. The flowchart explaining the handling method of a wireless power feeding system. The figure explaining the outline | summary of the resource collection | recovery system which transmits motive power to the compressor installed in a basement by a non-contact system.

Hereinafter, examples will be described with reference to the drawings. In addition, the following is only an Example, and it cannot be overemphasized that the content of invention is not limited to the following aspect.

In Example 1, a wireless power feeding system that supplies electric power from the ground to a compressor that pressurizes a fluid installed at a depth exceeding 1000 m from the ground will be described with reference to FIGS.

The wireless power feeding system that supplies power to the compressor 4 includes at least a double pipe 3 that includes an outer cylinder 1 and an inner cylinder 2 and communicates to a depth exceeding 1000 m from the ground, and a duplex having a depth exceeding 1000 m from the ground. Compressor 4 installed in the inner tube 2 for boosting the fluid, AC power supply 5 for supplying electricity from the ground, and installed outside the inner tube 2 for the double tube having a depth exceeding 1000 m from the ground The wireless power supply primary coil 6, the wireless power supply secondary coil 7 provided in the compressor, and the AC power supply 5 and the power supply cable 8 that electrically connects the wireless power supply primary coil 6 are configured. The power supply cable 8 between the AC power supply 5 and the primary coil 6 for wireless power supply is installed on the outer surface of the inner cylinder 2 by being bound with a metal strip 9 or the like. In addition, a wattmeter 29 is provided which measures the electromotive force generated in the secondary coil 7 for wireless power feeding provided inside the compressor.

FIG. 5 shows a part of the detailed structure of the compressor fixing mechanism 10. In the present embodiment, the required number of compressor fixing mechanisms 10 are provided at the positions of the upper end portion and the lower end portion inside the compressor. FIG. 5 shows a part of them. Inside the compressor, there is provided a compressor fixing mechanism 10 for pushing out a fixing jig 21 to a compressor fixing structure 20 on the inner surface of the inner tube of the double pipe. The compressor fixing mechanism 10 includes a screw shaft 22, a nut 23, a screw shaft. It is comprised by the drive motor 24 which rotates these, and the flame | frame which connects these. The screw shaft 22 is provided with a screw thread symmetrically with respect to the paper surface with the central portion as a boundary, and the fixing jig 21 can be pushed out by rotating the screw shaft 22 by a drive motor 24. As the compressor fixing structure 20 on the inner surface of the inner tube of the double tube, a structure in which a recess is provided on the inner surface of the inner tube 2 of the double tube 3 can be adopted. Further, the fixing jig 21 may be a protrusion having a shape that can be inserted into a hollow shape provided on the inner surface of the inner tube 2 of the double tube 3.

Furthermore, in the wireless power feeding system according to the present embodiment, as shown in FIG. 2, a wire rope 14 for pulling the compressor 4, a winch 18 that winds and sends the wire rope 14, extra cables and wires. A reel 19 for collecting the rope as needed, a power source and signal cable 15 for transmitting power and control signals to the compressor transfer device 11, and a power source and control device 16 for supplying power and control signals to the compressor transfer device. Prepare. The compressor transfer device 11 includes a drive mechanism 12, and the drive mechanism is in contact with the inner cylinder 2 by a tire or the like so as to be able to travel on the inner surface of the inner cylinder 2 of the double pipe. This is because the double pipe 3 provided up to a depth of more than 1000 m from the ground is not necessarily required to pass through the double pipe having an inclination depending on the place, not only in a place provided vertically. This is to guide the well 4 to the well so that the compressor 4 does not stop in the middle of 3. In addition, the compressor transfer device 11 is used because there is a possibility that the compressor 4 may be difficult to enter the well base due to the pressure difference. The compressor transfer device 11 and the compressor 4 are connected by a gripping mechanism 13 and a carry-in / out lifting jig 17.

The wireless power feeding to the compressor 4 is caused by causing a magnetic field fluctuation generated by supplying an alternating current to the wireless power feeding primary coil 6 to the inside of the wireless power feeding secondary coil 7. This is realized by generating electromotive force by electromagnetic induction. The supply of alternating current to the wireless power feeding primary coil 6 is supplied from the alternating current power source 5 through the feeding cable 8. Here, the wireless power supply may be performed in a non-contact manner, and is not limited to the coil of this embodiment. That is, the wireless power feeding primary coil 6 and the wireless power feeding secondary coil 7 may be configured so as to be separable, and there may be no space between the two coils so that they are substantially in contact with each other. Absent. The control of the compressor 4 is performed by, for example, using a control signal of the control device 35 and an operation state signal of the compressor 4 using a compressor control signal cable 36 and an infrared transmission / reception window 38 laid in the same manner as the power supply cable 8. It implement | achieves using the infrared communication means installed in the inner cylinder 2 of the double tube 3. FIG. In this case, the compressor 4 also needs to be provided with infrared communication means and an infrared transmission / reception window 37. It is necessary to match the positions of the primary coil 6 for wireless power feeding and the secondary coil 7 for wireless power feeding and the positions of the infrared receiving and transmitting

windows

37 and 38 of the compressor 4 and the inner cylinder 2 with high accuracy. For this reason, high positioning accuracy is requested | required of the construction method which installs the compressor 4 in the inner cylinder 2 inside.

A method for installing the compressor at a depth exceeding 1000 m from the ground with high positioning accuracy will be described with reference to FIGS. 2, 3, and 4 and FIG. 8 (step diagram) of the flow. As shown in FIG. 2, first, the compressor 4 is attached to the compressor transfer device 11 and hung with a wire rope 14 to be inserted into the inner tube 2 of the double pipe 3, Lower to the deep underground (step 102). The compressor transfer device 11 is configured to be able to travel by a drive mechanism 12 that can move at least inside the inner tube of the double pipe, so that the compressor 4 can reach the predetermined position of the well without stopping midway. It is possible to guide. The compressor 4 is gripped by a gripping mechanism 13 that grips a carry-in / out suspension jig 17 of the compressor. As shown in FIG. 7, the gripping mechanism 13 is provided with a plug 25 for supplying power to the compressor 4 and transmitting / receiving control signals. The compressor 4 is also provided with a socket 26 to which the plug 25 is connected, and the measurement result of the electromotive force of the secondary coil 7 for wireless power feeding is transmitted. Further, the compressor transfer device 11 is connected to the ground power supply and control device 16 through a power supply and signal cable 15, and transmits the electromotive force measurement result of the secondary coil 7 for wireless power feeding to the control device, and the drive mechanism. 12 and the gripping mechanism 13 are operated. At this time, an alternating current is supplied from the ground AC power source 5 to the primary coil 6 for wireless power feeding, and a magnetic field fluctuation is generated in the vicinity of the primary coil 6 for wireless power feeding.

Thereafter, as shown in FIG. 3, the fact that the compressor 4 has reached the installation position of the primary coil 6 for wireless power feeding is detected by the result of the electromotive force measurement of the secondary coil 7 for wireless power feeding reaching the maximum value. (Step 103), the fixing jig 21 is pushed out from the compressor fixing mechanism 10 to the compressor fixing structure 20 on the inner surface of the inner cylinder 2 of the double pipe 3 to fix the compressor 4 inside the inner cylinder 2 (Step 104). . In addition, even when the electromotive force measurement result reaches the maximum value, the measurement value within a range in which the electric power that can sufficiently operate the compressor 4 can be supplied may be detected and fixed as a predetermined value. Thus, by using the electromotive force measurement result, the compressor 4 can be positioned with high positional accuracy.

After the compressor 4 is fixed inside the inner cylinder 2, the gripping mechanism 13 of the compressor transfer device 11 is separated from the carry-in / out lifting jig 17 of the compressor, and the compressor transfer device 11 is recovered as shown in FIG. To do.

Compressor is operated for a predetermined period to produce oil and natural gas (step 105). After a predetermined period, the compressor 4 is recovered for periodic inspection or when a failure occurs.

When recovering the compressor 4, the compressor 4 is recovered by reversing the above-described compressor installation procedure. Specifically, first, the drive mechanism 12 is driven to transfer the compressor transfer device 11 to the installation position of the compressor 4 inside the inner tube 2 of the double pipe 3, and the gripping mechanism 13 of the compressor transfer device 11. The gripping jig 17 for carrying in and out of the compressor is gripped. Thereafter, the fixing jig of the compressor fixing mechanism 10 is pulled back from the compressor fixing structure 20 on the inner surface of the inner cylinder 2 of the double pipe 3 to release the fixing, and through the inside of the inner cylinder 2 of the double pipe 3 together with the compressor transfer device 11. The compressor 4 is transferred to the ground (step 106). The compressor fixing mechanism is released by operating the drive motor 24 of the compressor fixing mechanism by connecting the plug 25 provided in the compressor transfer device 11 to the socket 26 provided in the compressor and supplying power. To release. In the present embodiment, electricity is supplied via the compressor transfer device 11 for releasing the compressor fixing mechanism. This is not only for the compressor 4 but also for wireless power feeding in a harsh environment of 1000 m or more underground. It is also assumed that the primary coil 6 and the secondary coil 7 for wireless power feeding will fail, and if the power is made to depend only on the wireless power feeding coil, the compressor 4 cannot be recovered and may be recovered together with the inner cylinder 2. In order to avoid this, power is supplied via another route to improve the reliability of the system. In addition, as shown in FIG. 6, the compressor fixing mechanism is separately configured, and the screw shaft 22 of the compressor fixing mechanism is extended to directly operate the screw shaft by the screw shaft rotating operation mechanism 28 provided in the compressor transfer device 11. You may comprise. Thereby, since it can be provided only by a mechanical mechanism without using an electronic component, it is possible to make the device more resistant to failure without using an electrical component.

In the case of the conventional power supply method, a wired power cable is physically connected to the compressor and power is supplied from the ground. Therefore, to replace the compressor, replace the vertical hole (double pipe inner cylinder) ( However, according to the present embodiment, since the wired cable is not physically connected to the compressor, the vertical hole (inner cylinder of the double pipe) is required. The compressor can be replaced without replacement). Thereby, since the exchange period of a compressor can be shortened significantly, the operating rate of a well source can be improved. Furthermore, since the secondary coil for wireless power feeding is housed in the compressor, the terminal portion of the electric wire can be isolated from the corrosive environment, so that the corrosion resistance of the compressor is also improved. Furthermore, by measuring the power supply amount in the wireless power feeding coil, the compressor can be installed at a predetermined position with high positioning accuracy in a remote place that is more than 1000 m underground.

Example 2 will be described with reference to FIG. The description of the parts having the same configuration as in Example 1 is omitted. In the second embodiment, a stator coil 30 and a rotor (permanent magnet) 31 are provided in place of the wireless power feeding primary coil 6 and the wireless power feeding secondary coil 7. The rotor 31 is directly fixed to the rotary shaft 32 of the compressor, and the rotary blades 33 of the compressor are fixed to the rotary shaft. In other words, in this embodiment, the compressor including the stator coil provided in the double tube can be regarded as a compressor. In this embodiment, the wattmeter 29 replaces the magnetic field measuring device 34 for measuring the strength of the magnetic field, whereby the positional relationship between the rotor 31 of the compressor and the stator coil 30 provided in the double tube. Can be accurately grasped.

In addition to the effects of the first embodiment, this embodiment can selectively replace only a portion that is exposed to a harsh environment and has a high failure probability, and can further improve the operating rate of the well source. At least, the control mechanism can be out of the compressor, so that the system is more resistant to failure.

In the first embodiment and the second embodiment, as the energy transmission mechanism, the primary coil 6 for wireless power feeding and the secondary coil 7 for wireless power feeding, the stator coil 30 and the rotor 31 are used to transmit electric power and driving force. However, the present invention is not limited to this as long as it can transmit energy (electricity, magnetic field, etc.) in a substantially non-contact manner. In addition, the non-contact method is not limited, for example, as long as the primary coil 6 for wireless power feeding and the secondary coil 7 for wireless power feeding are configured to be separable, and there is no space between them.

In addition, this invention is not limited to the above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Outer cylinder 2 ... Inner cylinder 3 ... Double pipe 4 ... Compressor 5 ... AC power supply 6 ... Primary coil 7 for wireless power feeding ... Secondary coil 8 for wireless power feeding ... Feed cable 9 ... Metal strip 10 ... Compressor fixing mechanism 11 ... Compressor transfer device 12 ... Drive mechanism 13 ... Grab mechanism,
DESCRIPTION OF SYMBOLS 14 ... Wire rope 15 ... Power supply and signal cable 16 ... Power supply and control apparatus 17 ... Lifting jig 18 for loading / unloading ... Winch 19 ... Reel 20 ... Compressor fixing structure 21 ... Fixing jig 22 ... Screw shaft 23 ... Nut 24 ... Drive motor 25 ... Plug 26 ... Socket 27 ... Drive motor 28 of compressor transfer device ... Screw shaft rotation operating mechanism 29 ... Wattmeter 30 ... Stator coil 31 ... Rotor (permanent magnet)
32 ... Rotary shaft 33 of compressor ... Rotary blade 34 of compressor ... Magnetic field measuring device 35 ... Control device 36 ...

Signal cables

37 and 38 for compressor control.

Claims

A double pipe composed of an outer cylinder and an inner cylinder and communicating from the ground to the base of the well,
A compressor that pressurizes the fluid installed inside the inner cylinder of the double pipe and at the well base;
An energy supply source for supplying energy;
A first energy transmission mechanism that is provided in the double pipe and transmits energy in a non-contact manner;
A second energy transmission mechanism that is provided in the compressor and transfers energy transmitted from the first energy transmission mechanism in a non-contact manner;
A resource recovery system comprising a cable for electrically connecting the energy supply source and the first energy transmission mechanism.
The resource recovery system according to claim 1,
The first energy transfer mechanism is a primary coil for wireless power supply, the second energy transfer mechanism is a secondary coil for wireless power supply, and the primary coil for wireless power supply and the secondary coil for wireless power supply are in a non-contact manner. A resource recovery system that transmits power.
The resource recovery system according to claim 1,
The first energy transmission mechanism is a stator coil, the second energy transmission mechanism is a rotor, and a resource that transmits energy for driving the rotor in a non-contact manner due to a magnetic field variation generated in the stator coil. Collection system.
The resource recovery system according to any one of claims 1 to 3,
A compressor fixing mechanism provided in the compressor;
A measuring instrument provided in the compressor, for measuring the energy transfer intensity of the first energy transfer mechanism and the second energy transfer mechanism;
The resource recovery system which has a control apparatus which controls the drive of the fixing jig of the said compressor fixing mechanism by the measurement result of the said measuring device.
The resource recovery system according to any one of claims 1 to 4,
A compressor transfer device for transferring the compressor inside the double pipe; and a gripping mechanism provided in the compressor transfer device;
A lifting jig for loading and unloading provided in the compressor and gripped by the gripping mechanism;
A resource recovery system comprising: a plug provided in the gripping mechanism; and a socket connected to the plug and provided in the carry-in / out lifting jig.
The resource recovery system according to claim 5,
A wire rope connected to the compressor transfer device;
A winch that pulls the wire rope;
A resource recovery system having a reel for recovering the cable.
A compressor configured to increase the pressure of a fluid provided in a double pipe configured from an outer cylinder and an inner cylinder and communicating from the ground to the base of a well,
A first energy transmission mechanism that is provided in the double pipe and transmits energy in a non-contact manner;
In the handling method of the resource recovery system configured by the second energy transmission mechanism that is provided in the compressor and transfers energy transmitted from the first energy transmission mechanism in a non-contact manner,
While the energy is supplied to the first energy transfer mechanism, the compressor is lowered to a planned installation position, and the energy transfer intensity of the second energy transfer mechanism is measured by a measuring instrument provided in the compressor,
At the position where the energy transmission intensity of the second energy transmission mechanism becomes a predetermined value, the fixing jig is pushed out from the compressor fixing mechanism provided in the compressor to the compressor fixing structure provided on the inner surface of the double pipe inner cylinder. A method of handling a resource recovery system for fixing the compressor inside the double pipe inner cylinder.
In the handling method of the resource recovery system according to claim 7,
The lowering of the compressor is a resource recovery system for lowering to a predetermined position using a drive mechanism provided in the compressor transfer device in a state where a compressor transfer device for transferring the compressor is attached to the compressor. How to handle.
In the handling method of the resource recovery system according to claim 7 or 8,
After a predetermined operating time of the compressor has elapsed, the fixing jig of the compressor fixing mechanism is pulled back into the compressor and separated from the inner surface of the inner tube of the double tube, and the inside of the double tube using the compressor transfer device How to handle a resource recovery system that transports the compressor to the ground through the inside of the cylinder.
A downhole compressor installed underground,
The compressor is a downhole compressor provided with an energy transmission mechanism for transferring energy in a non-contact manner.
The downhole compressor according to claim 10, wherein
A downhole compressor in which the energy transmission mechanism is a coil.
The downhole compressor according to claim 10, wherein
The energy transmission mechanism is a downhole compressor which is a stator.
The downhole compressor according to any one of claims 10 to 12,
A compressor fixing mechanism provided in the downhole compressor;
The downhole compressor provided with the measuring device which is provided in the downhole compressor and measures the energy transfer intensity of the energy transfer mechanism.
The downhole compressor according to any one of claims 10 to 13,
A hanging jig for loading and unloading provided and gripped in the downhole compressor;
The downhole compressor provided with the socket provided in the said lifting jig for carrying in / out.