CN106907146B - Control valve and hydrofracturing geodesic stress test device - Google Patents
Control valve and hydrofracturing geodesic stress test device Download PDFInfo
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- CN106907146B CN106907146B CN201710256332.XA CN201710256332A CN106907146B CN 106907146 B CN106907146 B CN 106907146B CN 201710256332 A CN201710256332 A CN 201710256332A CN 106907146 B CN106907146 B CN 106907146B
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- overflow
- guide rod
- main guide
- valve
- packer
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a control valve, which comprises a main guide rod, a first pressure channel, a second pressure channel and an overflow hole, wherein the overflow hole is formed in the outer wall of the main guide rod and communicated with the first pressure channel; the main guide rod penetrates through the hollow cavity of the valve body, and the overflow valve is connected with a driving device capable of driving the overflow valve to slide along the outer wall of the main guide rod; when the overflow valve moves along the main guide rod, the overflow hole and the overflow channel can be in butt joint communication or staggered partition; the top of the overflow valve is abutted with a compressible elastic part sleeved on the main guide rod, and the top of the elastic part is abutted with a limiting block fixed on the main guide rod. Through the design of the control valve, the packer can realize convenient pressurization and pressure relief, so that the whole device extending into the drill hole can conveniently move up and down, and the next test can be conveniently carried out.
Description
Technical Field
The invention belongs to hydrofracturing method ground stress test equipment, and particularly relates to a control valve and a hydrofracturing ground stress test device.
Background
The principle of the hydrofracturing method ground stress test is that a pair of expandable rubber packers is utilized to pack a section of drilled hole at a preset test depth, then a liquid medium is pumped to apply pressure to the pack section, pressure parameters such as fracture pressure, instantaneous closing pressure, and re-tensioning pressure can be obtained according to characteristic values of a fracturing process curve, and a plane ground stress state is directly deduced from a fracture seam direction.
The conventional hydraulic loading mode is divided into a single channel and a double channel, wherein the single channel means that hydraulic pressure of a packer and a pressurizing section is realized by one channel (usually a hollow drill rod), and the channel switching is realized by pressing and pulling the drill rod. Dual path is where two separate pressure paths (usually two high pressure pipes) are used to pressurize the packer and the pressurized section separately, with the pressure in both paths being controlled by a switch at the surface.
After testing in one section of the borehole, the testing apparatus needs to be moved to another section of the borehole for the same test. However, in the process, the two devices have common defects, because the pressurizing device is arranged at the orifice, when the test section is deep, if no water exists in the hole, no external water pressure exists outside the packer, the pressure generated by the water in the packer can cause the packer to expand and cling to the hole wall, the whole device extending into the drill hole is clamped and cannot move up and down, and the next test cannot be carried out. However, in the case of a large external water pressure in the borehole, the external water pressure will counteract the swelling of the packer, so that the equipment extending into the borehole can be moved, and therefore, the equipment of the prior art is generally only suitable for water-rich boreholes and is limited to use in dry or low ground water level boreholes.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a hydrofracturing geodesic stress test device suitable for dry holes and a matched control valve.
The technical scheme for solving the problems is as follows: a control valve comprises a main guide rod, a first pressure channel and a second pressure channel which are mutually independent and are arranged in the main guide rod in a run-through manner, an overflow hole which is formed in the outer wall of the main guide rod and communicated with the first pressure channel, wherein an overflow valve is sleeved on the outer wall of the main guide rod positioned in the area of the overflow hole, and the overflow valve comprises a valve body with a hollow cavity and an overflow channel which is formed in the wall of the valve body in a run-through manner and communicated with the hollow cavity of the valve body;
the main guide rod penetrates through the hollow cavity of the valve body, and the overflow valve is connected with a driving device capable of driving the overflow valve to slide along the outer wall of the main guide rod; when the overflow valve moves along the main guide rod, the overflow hole and the overflow channel can be in butt joint communication or staggered partition;
the top of the overflow valve is abutted with a compressible elastic part sleeved on the main guide rod, and the top of the elastic part is abutted with a limiting block fixed on the main guide rod.
In the scheme, the overflow valve is driven by the driving device to move up and down along the main guide rod, and when the overflow valve moves to the overflow hole to be communicated with the overflow channel, the pressure of liquid in the first pressure channel is relieved; when the first pressure channel moves to the overflow hole and is staggered and separated from the overflow channel, the first pressure channel is in a pressure maintaining state.
Furthermore, the overflow channel comprises a plurality of annular overflow grooves formed around the inner cavity of the valve body and overflow pipes formed on the wall of the valve body and perpendicular to the axial direction of the valve body, and each overflow pipe is communicated with the overflow grooves.
For better sealing, a first sealing ring and a second sealing ring are respectively arranged in the inner cavity of the valve body and above and below the overflow groove, and a third sealing ring is arranged at the upper part of the inner cavity of the valve body and far away from the first sealing ring;
the overflow hole is always positioned between the second sealing ring and the third sealing ring.
By the scheme, the sealing performance of the equipment is good no matter the communication or the isolation state of the overflow hole and the overflow channel is ensured.
Specifically, the driving device comprises a sleeve connected with the wall of the valve body and a pull rope connected with the top of the sleeve, and the pull rope extends upwards out of the drill hole and is fixed.
Correspondingly, the invention also provides a hydrofracturing geodesic stress testing device which comprises an upper packer and a lower packer which are arranged at intervals, wherein the upper packer comprises a hollow sealing rubber cylinder and a pressurizing pipe penetrating through the hollow cavity of the sealing rubber cylinder, the lower packer comprises a hollow sealing rubber cylinder, the sealing rubber cylinders of the upper packer and the lower packer are communicated through a pipeline, the hydrofracturing geodesic stress testing device also comprises the control valve, the outlet of a first pressure channel of the control valve is communicated with the sealing rubber cylinder of the upper packer in a butt joint mode, and the outlet of a second pressure channel of the control valve is communicated with the pressurizing pipe of the upper packer in a butt joint mode.
In the test device, an upper packer and a lower packer are existing equipment, the assembly mode of the upper packer and the lower packer in a drill hole is the same as that of the conventional technology, and after the upper packer and the lower packer enter the drill hole, a cavity formed by the upper packer and the lower packer and the wall of the drill hole in an enclosing mode is a test pressurizing section. During the test, liquid is injected into the sealing rubber cylinders of the upper packer and the lower packer through the first pressure channel, and the liquid is injected into the pressurizing section through the pressurizing pipe through the second pressure channel.
Furthermore, the packer pressurizing system is connected with the inlet of the first pressure channel, and the pressurizing section pressurizing and collecting system is connected with the inlet of the second pressure channel.
Specifically, a winch is arranged at the drilling hole, the driving device comprises a sleeve connected with the wall of the valve body and a pull rope connected with the top of the sleeve, and the pull rope upwards extends out of the drilling hole and is wound on the winch.
The invention enables the equipment for measuring the ground stress by the hydrofracturing method to have the pressure relief function through the design of the control valve, and particularly can realize the convenient pressurization and pressure relief of the packer in a dry hole or a drill hole with lower underground water level, so that the whole equipment extending into the drill hole can conveniently move up and down, and the next test can be favorably carried out.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a structure view of a main leader.
Fig. 2 is a front view of the relief valve.
Fig. 3 is a plan view of the relief valve.
Fig. 4 is a sleeve structure view.
Fig. 5 is a structural view of the control valve.
FIG. 6 is a schematic diagram of the test apparatus.
FIG. 7 is a diagram of an upper packer construction.
FIG. 8 is a lower packer construction.
In the figure: 1-main guide rod, 2-overflow valve, 3-limiting block, 4-elastic piece, 5-sleeve, 6-pull rope, 7-drilling hole, 8-upper packer, 9-lower packer, 10-winch, 11-first pressure channel, 12-second pressure channel, 13-overflow hole, 21-valve body, 22-overflow groove, 23-overflow pipe, 24-first sealing ring, 25-second sealing ring, 26-third sealing ring, 81-sealing rubber cylinder, 82-pressurizing pipe, 100-packer pressurizing system and 101-pressurizing section pressurizing acquisition system.
Detailed Description
As shown in fig. 1 to 5, a control valve includes a main guide rod 1, a first pressure channel 11 and a second pressure channel 12 which are arranged in the main guide rod 1 in a penetrating manner, and an overflow hole 13 which is arranged on the outer wall of the main guide rod 1 and is communicated with the first pressure channel 11.
The outer wall of the main guide rod 1 positioned in the area of the overflow hole 13 is sleeved with an overflow valve 2. The overflow valve 2 comprises a hollow valve body 21 and an overflow channel which is arranged on the wall of the valve body 21 in a penetrating way and communicated with the hollow cavity of the valve body 21.
The overflow channel comprises a circumferential overflow groove 22 arranged around the inner cavity of the valve body 21 and an overflow pipe 23 arranged on the wall of the valve body 21 and perpendicular to the axial direction of the valve body. The overflow pipes 23 are arranged in a plurality at intervals around the wall of the valve body 21, and each overflow pipe 23 is communicated with the overflow groove 22.
A first sealing ring 24 and a second sealing ring 25 are respectively arranged in the inner cavity of the valve body 21 and above and below the overflow groove 22. A third sealing ring 26 is arranged at the upper part of the inner cavity of the valve body and far away from the first sealing ring 24.
The overflow aperture 13 is always located between the second sealing ring 25 and the third sealing ring 26.
The main guide rod 1 penetrates through the hollow cavity of the valve body 21, and the overflow valve 2 is connected with a driving device capable of driving the overflow valve 2 to slide along the outer wall of the main guide rod 1. The driving device comprises a sleeve 5 connected with the wall of the valve body 21 and a pull rope 6 connected with the top of the sleeve 5. The pull rope 6 extends upwards out of the drill hole 7 and is fixed.
When the overflow valve 2 moves along the main guide rod 1, the overflow hole 13 and the overflow channel can be communicated in a butt joint mode or separated in a staggered mode.
The top of the overflow valve 2 is abutted with a compressible elastic part 4 sleeved on the main guide rod 1, and the top of the elastic part 4 is abutted with a limiting block 3 fixed on the main guide rod 1. The resilient member is preferably a spring.
As shown in fig. 6 to 8, the embodiment further provides a hydraulic fracturing ground stress testing device, which comprises an upper packer 8 and a lower packer 9 which are arranged at intervals. The upper packer 8 comprises a hollow packing unit 81, a pressurized pipe 82 passing through the hollow of the packing unit 81. The lower end of the pressure pipe is provided with a hole. The lower packer 9 comprises a hollow packing unit 81. The upper packer 8 is communicated with the sealing rubber cylinder 81 of the lower packer 9 through a pipeline.
The packer also comprises the control valve, wherein the outlet of the first pressure channel 11 of the control valve is in butt joint communication with the sealing rubber sleeve 81 of the upper packer 8. The outlet of the second pressure channel 12 is in abutting communication with a pressurization pipe 82 of the upper packer 8.
The packer pressurizing system 100 is connected with the inlet of the first pressure channel 11, and the pressurizing section pressurizing and collecting system 101 is connected with the inlet of the second pressure channel 12.
At the orifice of the bore hole 7, a capstan 10 is provided, and the pull rope 6 is extended upward out of the bore hole 7 and wound on the capstan 10.
After the test device is assembled, the control valve, the upper packer and the lower packer are placed at the designated positions by the winch 10, the test is started, the overflow pipe 23 is not communicated with the overflow hole 13 at the moment, and the pressure can be transmitted to the upper packer and the lower packer, so that the sealing rubber cylinder 81 is expanded. After the experiment, upwards lifting rope 6, because upper and lower packer was in the expanded state this moment, hugs closely the pore wall, and is unable to remove, and only overflow valve 2 can the rebound, compression spring when removing, when overflow hole 31 on the leading pole 1 and overflow pipe 23 intercommunication of 2 on the overflow valve, liquid in the packer flowed to the drilling hole in through overflow pipe 23 from overflow hole 13, and pressure release, upper and lower packer slowly contracts. When upper and lower packer no longer hug closely the pore wall, under the rebound effect of spring, overflow valve 2 moves down, and overflow hole 13 staggers with overflow pipe 23 and cuts off, goes up 8 pressure channel of packer and keeps apart with the external world once more, can remove test device to next test section this moment, continues the experiment.
Claims (5)
1. A control valve, characterized by: the overflow valve comprises a main guide rod (1), a first pressure channel (11) and a second pressure channel (12) which are arranged in the main guide rod (1) in a penetrating manner and are mutually independent, an overflow hole (13) which is formed in the outer wall of the main guide rod (1) and communicated with the first pressure channel (11), wherein an overflow valve (2) is sleeved on the outer wall of the main guide rod (1) positioned in the area of the overflow hole (13), and the overflow valve (2) comprises a valve body (21) with a hollow cavity and an overflow channel which is formed in the wall of the valve body (21) in a penetrating manner and communicated with the hollow cavity of the valve body (21);
the main guide rod (1) penetrates through the hollow cavity of the valve body (21), and the overflow valve (2) is connected with a driving device capable of driving the overflow valve (2) to slide along the outer wall of the main guide rod (1); when the overflow valve (2) moves along the main guide rod (1), the overflow hole (13) and the overflow channel can be in butt joint communication or staggered partition;
the top of the overflow valve (2) is abutted with a compressible elastic part (4) sleeved on the main guide rod (1), and the top of the elastic part (4) is abutted with a limiting block (3) fixed on the main guide rod (1); the overflow channel comprises a circumferential overflow groove (22) formed around the inner cavity of the valve body (21), and overflow pipes (23) formed on the wall of the valve body (21) in the axial direction of the valve body in a perpendicular mode, wherein the overflow pipes (23) are arranged on the wall of the valve body (21) at intervals, and each overflow pipe (23) is communicated with the overflow groove (22): the driving device comprises a sleeve (5) connected with the wall of the valve body (21) and a pull rope (6) connected with the top of the sleeve (5), and the pull rope (6) upwards extends out of the drill hole (7) and is fixed.
2. The control valve of claim 1, wherein: a first sealing ring (24) and a second sealing ring (25) are respectively arranged in the inner cavity of the valve body (21) above and below the overflow groove (22), and a third sealing ring (26) is arranged on the upper part of the inner cavity of the valve body and far away from the first sealing ring (24);
the overflow hole (13) is always positioned between the second sealing ring (25) and the third sealing ring (26).
3. The utility model provides a hydrofracturing surveys ground stress test device, includes last packer (8) and lower packer (9) that the interval set up, go up packer (8) including hollow sealed packing element (81), from pressurization pipe (82) that well cavity passed in sealed packing element (81), packer (9) are including hollow sealed packing element (81) down, go up and pass through pipeline intercommunication, its characterized in that between sealed packing element (81) of packer (9) down packer (8): further comprising a control valve according to claim 1 or 2, wherein the outlet of the first pressure channel (11) of the control valve is in butt communication with the sealing rubber cylinder (81) of the upper packer (8), and the outlet of the second pressure channel (12) is in butt communication with the pressurization pipe (82) of the upper packer (8).
4. The hydrofracturing geodetic stress test apparatus of claim 3, wherein: the packer pressurizing system (100) connected with the inlet of the first pressure channel (11) and the pressurizing section pressurizing and collecting system (101) connected with the inlet of the second pressure channel (12) are further included.
5. The hydrofracturing geodetic stress test apparatus of claim 4, wherein: a winch (10) is arranged at the hole opening of the drill hole (7), the driving device comprises a sleeve (5) connected with the wall of the valve body (21), and a pull rope (6) connected with the top of the sleeve (5), and the pull rope (6) extends out of the drill hole (7) upwards and is wound on the winch (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256332.XA CN106907146B (en) | 2017-04-19 | 2017-04-19 | Control valve and hydrofracturing geodesic stress test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256332.XA CN106907146B (en) | 2017-04-19 | 2017-04-19 | Control valve and hydrofracturing geodesic stress test device |
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| Publication Number | Publication Date |
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| CN106907146A CN106907146A (en) | 2017-06-30 |
| CN106907146B true CN106907146B (en) | 2023-04-07 |
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| CN201710256332.XA Active CN106907146B (en) | 2017-04-19 | 2017-04-19 | Control valve and hydrofracturing geodesic stress test device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107448169B (en) * | 2017-08-28 | 2023-07-25 | 中国地质科学院地质力学研究所 | Three-body type hydraulic fracture stress measurement push-pull valve |
| CN107859512B (en) * | 2017-12-05 | 2022-03-04 | 山东科技大学 | Double-section type top and bottom plate surrounding rock damage range observation system |
| CN107829725B (en) * | 2017-12-06 | 2018-10-02 | 中国地质科学院地质力学研究所 | A kind of water causes pressure break stress measurement and induces crack dynamic imaging integrating device |
| CN109915099B (en) * | 2019-04-11 | 2020-03-27 | 中国地质科学院地质力学研究所 | High-pressure water path control device and hydrofracturing ground stress measurement system |
| CN110130865B (en) * | 2019-06-06 | 2023-12-29 | 中国地质科学院地质力学研究所 | Push-pull switch assembly capable of eliminating system flexibility |
| CN113218773A (en) * | 2021-04-13 | 2021-08-06 | 赵雅清 | Hydrofracturing stress detection device |
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