CN108798660B - Stress measuring device by hydraulic fracturing method - Google Patents
Stress measuring device by hydraulic fracturing method Download PDFInfo
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- CN108798660B CN108798660B CN201810587970.4A CN201810587970A CN108798660B CN 108798660 B CN108798660 B CN 108798660B CN 201810587970 A CN201810587970 A CN 201810587970A CN 108798660 B CN108798660 B CN 108798660B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 238000004891 communication Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 abstract description 13
- 230000008569 process Effects 0.000 description 8
- 238000005553 drilling Methods 0.000 description 6
- 238000012856 packing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- 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
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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
- 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
- E21B49/006—Measuring wall stresses in the borehole
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
本发明提供了一种水压致裂法应力测量装置，属于岩体应力测量设备领域，包括上封隔器、下封隔器、压裂管及水流通阀；水流通阀包括阀体及中心杆；阀体上设有阶梯型内腔及通道；内腔包括第一腔室及第二腔室；中心杆上设有盲孔及第一出水孔，中心杆上部伸出第一腔室，且顶端与钻杆连接，中心杆的下部位于第二腔室；上封隔器设有上连接管；下封隔器设有下连接管；压裂管的顶端、底端分别与上连接管、下连接管连接；压裂管上设有第二出水孔；上封隔器与下封隔器之间连接有软管。本发明提供的水压致裂法应力测量装置，利用钻杆及水流通阀分别向封隔器及压裂管加压，不需要在钻孔内设置高压胶管，减少了下井操作步骤，实现了单回路供压。
The invention provides a hydraulic fracturing method stress measurement device, belonging to the field of rock mass stress measurement equipment, comprising an upper packer, a lower packer, a fracturing pipe and a water flow valve; the water flow valve comprises a valve body and a center The valve body is provided with a stepped inner cavity and a channel; the inner cavity includes a first chamber and a second chamber; the center rod is provided with a blind hole and a first water outlet, and the upper part of the center rod extends out of the first chamber, The top end is connected with the drill pipe, and the lower part of the center rod is located in the second chamber; the upper packer is provided with an upper connection pipe; the lower packer is provided with a lower connection pipe; the top and bottom ends of the fracturing pipe are respectively connected with the upper connection pipe , the lower connecting pipe is connected; the fracturing pipe is provided with a second water outlet; a hose is connected between the upper packer and the lower packer. The hydraulic fracturing method stress measurement device provided by the present invention utilizes the drill pipe and the water flow valve to pressurize the packer and the fracturing pipe respectively, and does not need to install a high-pressure rubber hose in the borehole, reduces the operation steps of going down the well, and realizes the Single circuit supply pressure.
Description
Technical Field
The invention belongs to the technical field of rock mass stress measuring equipment, and particularly relates to a stress measuring device by a hydraulic fracturing method.
Background
Geostress is the initial stress present in the earth's crust rock mass and is one of the important physical property parameters of solid earth. The ground stress is the source force causing deformation, instability and damage of rock mass, and is also an important parameter influencing the exploitation of deep energy sources such as petroleum, shale gas and dry heat rock. Therefore, the measurement work for developing the ground stress has important scientific and practical significance in the aspects of seismic mechanism research, energy exploitation, mine tunnel design, large dam foundation construction and the like.
The hydraulic fracturing method is a main measurement method for measuring rock stress promulgated by the international rock mechanics society, and the principle is that a section of drilled rock is sealed by a pair of expandable rubber packers at a preset test depth, then liquid is pumped in to apply pressure to the section of drilled rock until the rock is fractured, and the magnitude and direction of the ground stress and the change rule of the ground stress along the depth are determined according to the pressure characteristic value and the fracture direction of a fracture process curve.
The existing stress measuring device of the hydraulic fracturing method generally adopts double-loop pressure supply, one path of the pressure supply is carried out on a packer by a ground high-pressure pump through a high-pressure rubber pipe, and the other path of the pressure supply is carried out on a fracturing section by the ground high-pressure pump through a drill pipe through a fracturing pipe, so that the whole process of stress measurement of the hydraulic fracturing method is realized. The method can monitor the pressure changes of the packer and the fracturing section in the experimental process at the same time, but the operation is complicated in the process of descending the well by underground equipment, and for small-bore drilling, the sum of the overall dimensions of a high-pressure rubber pipe and a drill rod exceeds the diameter of the drilled hole, so the method is not suitable.
Disclosure of Invention
The invention aims to provide a stress measuring device by a hydraulic fracturing method, which aims to solve the technical problems that a double-loop stress measuring device in the prior art is complicated in operation in the process of going into a well and is not suitable for measuring the stress of small-diameter drill holes.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a stress measurement device of hydraulic fracturing method, including the last packer that the interval set up, lower packer, and connect go up the packer with the fracturing pipe of packer, its characterized in that down: the water flow valve is connected to the top of the upper packer and used for supplying water to the upper packer or the fracturing pipe;
the water flow valve comprises a valve body and a central rod which is positioned in the valve body and can move relative to the valve body; a stepped inner cavity is axially arranged on the valve body; the valve body is also provided with a channel communicated with the inner cavity of the upper packer; the stepped inner cavity comprises a first cavity and a second cavity positioned below the first cavity; the inner diameter of the first chamber is smaller than the inner diameter of the second chamber; the first chamber is in communication with the channel;
the outer diameter of the center rod is equal to the inner diameter of the first chamber; a blind hole is axially formed in the central rod, the upper part of the central rod extends out of the valve body, the top end of the central rod is connected with a drill rod, and the blind hole is communicated with the inner cavity of the drill rod; the lower part of the central rod is positioned in the second cavity, and a first water outlet hole communicated with the channel or the second cavity is formed in the side wall of the central rod;
the upper packer is provided with an upper connecting pipe which is communicated along the axial direction; the top end of the upper connecting pipe is positioned in the second chamber; the lower packer is provided with a lower connecting pipe which is communicated along the axial direction; the top end and the bottom end of the fracturing pipe are respectively connected with the upper connecting pipe and the lower connecting pipe; a second water outlet hole is formed in the fracturing pipe; a hose is connected between the upper packer and the lower packer; the hose is respectively communicated with the inner cavity of the upper packer and the inner cavity of the lower packer.
Furthermore, the fracturing pipe comprises a first fracturing pipe and a second fracturing pipe sleeved in the first fracturing pipe, and the fixed positions of the first fracturing pipe and the second fracturing pipe are adjustable.
Further, a pressure sensor is fixed on the outer wall of the first fracturing pipe.
Further, a water outlet joint is sleeved on the first fracturing pipe; the second water outlet hole is positioned on the first fracturing pipe; the second water outlet hole is communicated with the water outlet joint.
Furthermore, two ends of the fracturing pipe are respectively connected with the upper connecting pipe and the lower connecting pipe through a first connector and a second connector.
Furthermore, two ends of the fracturing pipe are respectively in threaded connection with the first connector and the second connector; the lower end of the upper connecting pipe is in threaded connection with the first connector; the upper end of the lower connecting pipe is in threaded connection with the second connector.
Furthermore, two ends of the upper packer are respectively provided with a fixed sleeve plate; and fixed sleeve plates are respectively arranged at two ends of the lower packer.
Further, the first water outlet hole is arranged along the radial direction of the central rod; the channel comprises a first channel arranged along the radial direction of the valve body and a second channel arranged along the axial direction of the valve body; the second channel and the second chamber are arranged at intervals, and the first channel is communicated with the first chamber.
Furthermore, a first boss protruding outwards in the radial direction is arranged on the part of the center rod extending out of the valve body; the outer diameter of the first boss is larger than the inner diameter of the first cavity; the bottom end of the central rod is provided with a second boss which protrudes outwards along the radial direction; the outer diameter of the second boss is greater than the inner diameter of the second chamber.
The stress measuring device of the hydraulic fracturing method provided by the invention has the beneficial effects that: compared with the prior art, the stress measuring device adopting the hydrofracturing method utilizes the drill rod and the water flow valve to respectively pressurize the packer and the fracturing pipe, does not need to arrange a high-pressure rubber pipe in a drilled hole, reduces the operation steps of going into the well, and realizes single-loop pressure supply. The stress measuring device by the hydraulic fracturing method is suitable for drilling holes with various apertures.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram i of a stress measurement device by a hydraulic fracturing method according to an embodiment of the present invention;
fig. 2 is a structural schematic diagram ii of a stress measuring apparatus by a hydraulic fracturing method according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 1;
fig. 4 is a partially enlarged view of fig. 2.
In the figure: 10. an upper packer; 11. an upper connecting pipe; 12. a first connector; 20. a lower packer; 21. a lower connecting pipe; 22. a second connector; 30. fracturing the pipe; 31. a first fracturing pipe; 32. a second fracturing pipe; 33. a second water outlet; 34. a pressure sensor; 35. a housing; 36. a water outlet joint; 40. a water flow valve; 41. a valve body; 411. a second chamber; 412. a channel; 42. a center pole; 421. a first water outlet; 422. blind holes; 423. a first boss; 424. a second boss; 50. a hose; 60. fixing the sleeve plate; 70. a drill stem; 80. and (6) drilling.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and 2 together, a stress measuring apparatus for hydraulic fracturing provided by the present invention will now be described. The stress measuring device of the hydraulic fracturing method comprises an upper packer 10, a lower packer 20, a fracturing pipe 30 and a water flow valve 40, wherein the upper packer 10 and the lower packer 20 are arranged at intervals, the fracturing pipe 30 is connected with the upper packer 10 and the lower packer 20, and the water flow valve 40 is connected to the top of the upper packer 10 and used for supplying water to the upper packer 10 or the fracturing pipe 30.
The water flow valve 40 comprises a valve body 41 and a central rod 42 located within the valve body 41 and movable relative to the valve body 41.
The valve body 41 is provided with a stepped inner cavity along the axial direction, the stepped inner cavity comprises a first cavity and a second cavity 411 positioned below the first cavity, the inner diameter of the first cavity is smaller than that of the second cavity 411, and the center line of the first cavity and the center line of the second cavity 411 are respectively superposed with the center line of the valve body 41. The valve body 41 is also provided with a passage 412 which is communicated with the inner cavity of the upper packer 10. The first chamber is in communication with the passage 412.
The outer diameter of the central rod 42 is equal to the inner diameter of the first chamber; the central rod 42 is provided with a blind hole 422 along the axial direction, the upper part of the central rod 42 extends out of the valve body 41, the top end of the central rod 42 is connected with the drill rod 70, and the blind hole 422 is communicated with the inner cavity of the drill rod 70; the lower portion of the central rod 42 passes through the first chamber and is located in the second chamber 411, and a first outlet hole 421 communicating with the channel 412 or the second chamber 411 is formed in the side wall of the central rod 42.
The upper packer 10 is provided with an upper connecting pipe 11 which is through along the axial direction, and the top end of the upper connecting pipe 11 is positioned in the second chamber 411; the lower packer 20 is provided with a lower connection pipe 21 penetrating in the axial direction. A hose 50 is connected between the upper packer 10 and the lower packer 20, and the hose 50 is respectively communicated with the inner cavity of the upper packer 10 and the inner cavity of the lower packer 20.
The top end and the bottom end of the fracturing pipe 30 are respectively connected with the upper connecting pipe 11 and the lower connecting pipe 21. The fracturing pipe 30 is provided with a second water outlet hole 33.
The stress measuring process of the stress measuring device by the hydraulic fracturing method provided by the invention is as follows:
the central rod 42 is connected to the drill pipe 70 and the drill pipe 70 is used to place the stress-measuring device to the target test depth of the borehole 80. The drill stem 70 is pulled upwardly so that the first outlet hole 421 is located in the first chamber and is in communication with the passage 412. The ground high-pressure water pump leads water into the inner cavity of the drill rod 70, and the water sequentially flows through the blind hole 422, the first water outlet hole 421 and the channel 412 to enter the inner cavity of the upper packer 10 and then enters the inner cavity of the lower packer 20 through the hose 50. As water is continuously injected into the inner cavity of the upper packer 10 and the inner cavity of the lower packer 20, the upper packer 10 and the lower packer 20 are expanded under the action of water pressure until the upper packer 10 and the lower packer 20 are tightly attached to the wall of the borehole 80, and the borehole section between the upper packer 10 and the lower packer 20 is sealed.
Then, the drill rod 70 is pressed downwards to enable the first water outlet hole 421 to be located in the second chamber 411, the ground high-pressure water pump introduces water into the inner cavity of the drill rod 70, the water sequentially flows through the blind hole 422, the first water outlet hole 421, the second chamber 411, the first connecting pipe 11 and the fracturing pipe 30, and finally the water is guided out from the second water outlet hole 33 to enter the sealed drill hole section, so that the pressurized fracturing of the rock body of the sealed drill hole section is realized. In the process, the change process of the water injection pressure is measured through a pressure sensor on the earth surface to obtain the fracture pressure, the re-expansion pressure and the closing pressure of the fractured fractures, and further the main stress values with the maximum and minimum horizontal levels of the measured depth section are obtained.
After the measurement is finished, the drill rod 70 is lifted up, the first water outlet hole 421 is connected with the channel 412 to form a barrel, the ground manifold is opened to be communicated with the atmosphere, the pressure in the upper packer 10 and the lower packer 20 is relieved along with the outflow of high-pressure water, and the packers shrink to be in the original state. At this point, the stress measurement at one station is finished. The stress measuring device can move to the next target position to continue the measurement.
Compared with the prior art, the stress measuring device adopting the hydrofracturing method provided by the invention has the advantages that the drill rod 70 and the water flow valve 40 are utilized to respectively pressurize the packer and the fracturing pipe 30, a high-pressure rubber pipe does not need to be arranged in the drill hole 80, the operation steps of descending a well are reduced, and single-loop pressure supply is realized.
Further, referring to fig. 3 and fig. 4, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, the first water outlet hole 421 is disposed along the radial direction of the central rod 42; the passage 412 includes a first passage provided in the radial direction of the valve body 41 and a second passage provided in the axial direction of the valve body 41; the second channel is spaced from the second chamber 411 and the first channel is in communication with the first chamber.
Further, referring to fig. 2 and 4, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, the bottom end of the central rod 42 is provided with a second boss 424 protruding outward in the radial direction, and the outer diameter of the second boss 424 is larger than the inner diameter of the second chamber 411. The inner diameter of the first outlet hole 421 is equal to the inner diameter of the first channel. The axial distance from the bottom end of the first outlet hole 421 to the top surface of the second protrusion 424 is equal to the axial distance from the bottom end of the first channel to the top surface of the second chamber 411. The central rod 42 can be driven by the drill rod 70 to move upwards, when the second boss 424 contacts with the top surface of the second chamber 411, the central rod 42 does not move upwards, and the first outlet hole 421 is located in the first chamber at this time and is communicated with the channel 412, because the second boss 424 contacts with the top surface of the second chamber 411, the second chamber 411 is blocked, and water can only flow into the channel 412 from the first outlet hole 421, and finally flows into the upper packer 10. The second protrusion 424 is used to prevent the central rod 42 from being pulled out of the second chamber 411, and is used to communicate the first outlet hole 421 with the channel 412 when the second protrusion 424 contacts with the top surface of the second chamber 411.
Further, referring to fig. 1 and 3, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, a first boss 423 protruding outward in a radial direction is provided on a portion of the central rod 42 extending out of the valve body 41. The outer diameter of the first boss 423 is larger than the inner diameter of the first chamber. The axial distance from the bottom surface of the first boss 423 to the top surface of the blind hole 422 is greater than the axial height of the first chamber. The central rod 42 can be driven by the drill rod 70 to move downwards, when the first boss 423 contacts with the top surface of the valve body 41, the central rod 42 does not move downwards, and the first water outlet hole 421 is located in the second chamber 411 at this time, because the inner diameter of the first chamber is equal to the outer diameter of the central rod 42, the outer wall of the central rod 42 seals the channel 412, and water can only flow into the second chamber 411 from the first water outlet hole 421, and finally flows into the fracturing pipe 30. The first protrusion 423 is used to prevent the central rod 42 from being pressed into the first chamber, and is used to ensure that the first outlet hole 421 is located in the second chamber 411 when the first protrusion 423 contacts with the top surface of the valve body 41.
Further, referring to fig. 1 or fig. 2, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, the fracturing pipe 30 includes a first fracturing pipe 31 and a second fracturing pipe 32 sleeved in the first fracturing pipe 31, and the fixing positions of the first fracturing pipe 31 and the second fracturing pipe 32 are adjustable. The first fracturing pipe 31 and the second fracturing pipe 32 are movably connected and can be connected by threads or clamped connection. The overall length of the fracturing pipe 30 is the length from the top end of the first fracturing pipe 31 to the bottom end of the second fracturing pipe 32, and the length can be adjusted according to the fixed positions of the first fracturing pipe 31 and the second fracturing pipe 32. The length of the packing drilling section required to be measured is different when different rock masses measure stress, and the length of the fracturing pipe 30 is adjustable, so that the stress measuring device can meet the stress measuring requirements of different rock masses.
Further, referring to fig. 1 or fig. 2, as a specific embodiment of the stress measuring apparatus for hydraulic fracturing provided by the present invention, a housing 35 is sleeved on an outer wall of the first fracturing pipe 31, and a pressure sensor 34 is fixed inside the housing 35. Pressure sensor 34 can directly gather the water pressure of packing drilling section, has improved measurement accuracy, and the water pressure value that pressure sensor 34 gathered is stored data processor, after fracturing test, carries data processor to ground, through reading data processor, can obtain the pressure recording curve.
Further, referring to fig. 1 or fig. 2, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, a water outlet joint 36 is sleeved on the first fracturing pipe 31, the second water outlet 33 is located on the first fracturing pipe 31, and the second water outlet 33 is communicated with the water outlet joint 36. The water outlet hole of the water outlet joint 36 is arranged along the radial direction of the first fracturing pipe 31. After the second fracturing pipe 32 is completely sleeved into the first fracturing pipe 31, the top surface of the second fracturing pipe 32 is located below the second water outlet hole 33 and the water outlet joint 36, so that the normal water injection of the packing drilling section can be ensured through the second fracturing pipe 30.
Further, referring to fig. 1 or fig. 2, as an embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, two ends of the fracturing pipe 30 are respectively connected to the upper connecting pipe 11 and the lower connecting pipe 21 through the first connector 12 and the second connector 22. Specifically, the upper end of the first fracturing pipe 31 and the lower end of the upper connecting pipe 11 are respectively screwed to the first connector 12, and the lower end of the second fracturing pipe 32 and the upper end of the lower connecting pipe 21 are respectively screwed to the second connector 22. The upper connecting pipe 11, the fracturing pipe 30 and the lower connecting pipe 21 are connected by using a connector and a threaded connection mode, so that the three are convenient to assemble.
Further, referring to fig. 1 or fig. 2, as a specific embodiment of the stress measuring apparatus of the hydraulic fracturing method provided by the present invention, two ends of the upper packer 10 are respectively provided with a fixed sleeve plate 60, and two ends of the lower packer 20 are also respectively provided with a fixed sleeve plate 60. The fixing sleeve plate 60 is used to fix the upper connection pipe 11 to the upper packer 10 and the lower connection pipe 21 to the lower packer 20.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. Stress measurement device of hydraulic fracturing method, including last packer, lower packer that the interval set up, and connect go up the packer with the fracturing pipe of packer, its characterized in that down: the water flow valve is connected to the top of the upper packer and used for supplying water to the upper packer or the fracturing pipe;
the water flow valve comprises a valve body and a central rod which is positioned in the valve body and can move relative to the valve body; a stepped inner cavity is axially arranged on the valve body; the valve body is also provided with a channel communicated with the inner cavity of the upper packer; the stepped inner cavity comprises a first cavity and a second cavity positioned below the first cavity; the inner diameter of the first chamber is smaller than the inner diameter of the second chamber; the first chamber is in communication with the channel;
the outer diameter of the center rod is equal to the inner diameter of the first chamber; a blind hole is axially formed in the central rod, the upper part of the central rod extends out of the valve body, the top end of the central rod is connected with a drill rod, and the blind hole is communicated with the inner cavity of the drill rod; the lower part of the central rod is positioned in the second cavity, and a first water outlet hole communicated with the channel or the second cavity is formed in the side wall of the central rod; a first boss which protrudes outwards along the radial direction is arranged on the part of the central rod, which extends out of the valve body; the outer diameter of the first boss is larger than the inner diameter of the first cavity; the bottom end of the central rod is provided with a second boss which protrudes outwards along the radial direction; the outer diameter of the second boss is larger than the inner diameter of the second cavity;
the upper packer is provided with an upper connecting pipe which is communicated along the axial direction; the top end of the upper connecting pipe is positioned in the second chamber; the lower packer is provided with a lower connecting pipe which is communicated along the axial direction; the top end and the bottom end of the fracturing pipe are respectively connected with the upper connecting pipe and the lower connecting pipe; a second water outlet hole is formed in the fracturing pipe;
a hose is connected between the upper packer and the lower packer; the hose is respectively communicated with the inner cavity of the upper packer and the inner cavity of the lower packer.
2. The hydrofracturing stress measuring apparatus of claim 1, wherein: the fracturing pipe comprises a first fracturing pipe and a second fracturing pipe sleeved in the first fracturing pipe, and the fixed positions of the first fracturing pipe and the second fracturing pipe are adjustable.
3. The hydrofracturing stress measuring apparatus of claim 2, wherein: and a pressure sensor is fixed on the outer wall of the first fracturing pipe.
4. The hydrofracturing stress measuring apparatus of claim 2, wherein: a water outlet joint is sleeved on the first fracturing pipe; the second water outlet hole is positioned on the first fracturing pipe; the second water outlet hole is communicated with the water outlet joint.
5. The hydrofracturing stress measuring apparatus of claim 1, wherein: and two ends of the fracturing pipe are respectively connected with the upper connecting pipe and the lower connecting pipe through a first connector and a second connector.
6. The hydrofracturing stress measuring apparatus of claim 5, wherein: two ends of the fracturing pipe are respectively in threaded connection with the first connector and the second connector; the lower end of the upper connecting pipe is in threaded connection with the first connector; the upper end of the lower connecting pipe is in threaded connection with the second connector.
7. The hydrofracturing stress measuring apparatus of claim 1, wherein: two ends of the upper packer are respectively provided with a fixed sleeve plate; and fixed sleeve plates are respectively arranged at two ends of the lower packer.
8. The hydrofracturing stress measuring apparatus of claim 1, wherein: the first water outlet hole is arranged along the radial direction of the central rod; the channel comprises a first channel arranged along the radial direction of the valve body and a second channel arranged along the axial direction of the valve body; the second channel and the second chamber are arranged at intervals, and the first channel is communicated with the first chamber.
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| CN201810587970.4A CN108798660B (en) | 2018-06-08 | 2018-06-08 | Stress measuring device by hydraulic fracturing method |
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| CN201810587970.4A CN108798660B (en) | 2018-06-08 | 2018-06-08 | Stress measuring device by hydraulic fracturing method |
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