CN109960291B - conversion control device of hydraulic fracturing ground stress measuring waterway - Google Patents
conversion control device of hydraulic fracturing ground stress measuring waterway Download PDFInfo
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- CN109960291B CN109960291B CN201910291456.0A CN201910291456A CN109960291B CN 109960291 B CN109960291 B CN 109960291B CN 201910291456 A CN201910291456 A CN 201910291456A CN 109960291 B CN109960291 B CN 109960291B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 238000005259 measurement Methods 0.000 claims abstract description 46
- 230000006835 compression Effects 0.000 claims abstract description 40
- 238000007906 compression Methods 0.000 claims abstract description 40
- 238000007789 sealing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 9
- 238000005553 drilling Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000011065 in-situ storage Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/02—Measuring force or stress, in general by hydraulic or pneumatic means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
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- Fluid Mechanics (AREA)
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- Automation & Control Theory (AREA)
- Safety Valves (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of absolute measurement of ground stress, in particular to a conversion control device of a hydraulic fracturing ground stress measurement water channel. The water drain valve comprises a water drain valve, a push-pull valve and a conversion adapter, wherein the water drain valve is connected with the push-pull valve through the conversion adapter; the water release valve comprises a first valve rod and a first valve body, a first valve cavity is formed in the first valve body, and the first valve rod is arranged in the first valve cavity; the first valve cavity comprises a sliding cavity and a water drainage cavity, the sliding cavity is communicated with the central through hole of the conversion catcher through a water passing passage, and the water drainage cavity is provided with a water drainage hole; the first valve rod is provided with a first central hole, the outer wall of the first valve rod is provided with an annular water outlet groove, and the first central hole is connected with the annular water outlet groove; the first valve rod is provided with a compression disc, the compression disc is arranged in the water drainage cavity in a sliding mode, and an elastic device is arranged in the water drainage cavity and connected with the compression disc. The hydraulic fracturing ground stress measuring and setting device has all functions of setting, fracturing and draining for hydraulic fracturing ground stress measurement, realizes that the three functions are not interfered with each other, and improves the measuring success rate.
Description
Technical Field
The invention relates to the technical field of absolute measurement of ground stress, in particular to a conversion control device of a hydraulic fracturing ground stress measurement water channel.
Background
Geostress is the natural stress present in the earth formation without engineering disturbance, also known as the initial or in situ stress of the rock mass, which is the fundamental force causing deformation, fracture or even the occurrence of an earthquake in the crustal rock mass. The development of ground stress measurement is the most direct and effective means to obtain the current ground stress state in a certain area. The measurement of the geostress is divided into measurement of the relative stress and measurement of the absolute stress, the measurement of the relative stress is also called as geostress monitoring, and the purpose is to obtain dynamic change data of the geostress in the crustal rock mass along with time; absolute stress measurement is also called in-situ stress measurement and aims to obtain the current state of the in-situ stress in the crustal rock mass. The in-situ stress measurement method commonly used at home and abroad mainly comprises a stress relief method and a hydraulic fracturing method, and the hydraulic fracturing method is the only method for directly measuring the in-situ stress of deep holes with the depth of kilometers or more.
the method for measuring the in-situ stress of the hydraulic fracturing comprises the following steps: a section of the borehole is sealed off at a selected measurement depth using a pair of swellable packers, and the test section (often referred to as the fracture section) is then pressurized by pumping fluid while the pressure change over time is recorded using a computer digital acquisition system. Analyzing the actually measured recording curve to obtain characteristic pressure parameters (including fracture pressure, re-tensioning pressure and closing pressure), and obtaining the maximum and minimum horizontal main stress values at the measured point and rock mechanical parameters such as the hydraulic fracturing tensile strength of the rock according to a corresponding theoretical calculation formula.
The hydraulic fracturing ground stress measuring system is divided into a single-loop ground stress measuring system and a double-loop ground stress measuring system. The dual-loop hydrofracturing ground stress measurement system is that a packer setting high-pressure water loop and a fracturing loop are physically divided and are not communicated with each other, and the dual-loop hydrofracturing ground stress measurement system is mainly suitable for measuring vertical drilling holes with shallow holes and shallow water levels; the single-loop hydrofracturing ground stress measurement system is that a packer is set and fractured through an underground waterway change-over switch, a drill rod single waterway is arranged above the waterway change-over switch, and the system is mainly suitable for vertical drilling of deep holes and deep water levels.
The existing underground waterway change-over switch for measuring the hydrofracturing ground stress has the defects and the problems that: after the setting of the double packer is finished, the double packer needs to be pressed down by the gravity of a drill rod to enable the waterway to be communicated with the fracturing position, and the waterway is switched to the middle of the fracturing position from the setting position and passes through a water drainage position, so that the setting or fracturing failure is often caused by the water drainage of the packer, and the success rate of the test is seriously influenced or the test failure is caused; the stroke of converting from the setting position to the fracturing position is short, only 6 cm, and the slow descending cannot be accurately controlled in order to quickly pass through a water drainage hole and reduce the water drainage amount, so that the whole weight of a drill rod is pressed on the double packer, and the packer is crushed by the overweight weight of the upper drill rod under the condition of deep hole measurement, so that the test fails; in addition, due to the existence of the drain hole, in the frequent switching process of the water path, slurry in the drill hole is repeatedly sucked into the water path switching switch to block the switching water path, so that the test fails and the device is damaged. The above disadvantages and problems will be more serious in the case of a large depth of the borehole and a large mud density.
Disclosure of Invention
the invention aims to provide a conversion control device of a hydrofracturing ground stress measurement water channel, which can solve the problem that in the prior art, water can be drained and depressurized when a setting state and a fracturing state are converted due to the fact that a draining position is between a setting position and a pressure position, so that the state does not need to be rapidly converted, the bearing capacity of a packer is guaranteed, and the test effect is further guaranteed.
the embodiment of the invention is realized by the following steps:
A conversion control device of a hydrofracturing ground stress measurement waterway comprises a drain valve, a push-pull valve and a conversion catcher, wherein the drain valve is connected with the push-pull valve through the conversion catcher;
The water release valve comprises a first valve rod and a first valve body, a first valve cavity is arranged in the first valve body, and the first valve rod is arranged in the first valve cavity in a sliding mode;
The first valve cavity comprises a sliding cavity and a water drainage cavity, the sliding cavity is communicated with the central through hole of the conversion catcher through a water passing passage, and a water drainage hole communicated with the outside is formed in the side wall of the water drainage cavity;
A first central hole is formed in the first valve rod, an annular water outlet groove is formed in the side wall of the sliding cavity, and the first central hole and the annular water outlet groove can be connected through a first water outlet hole;
A compression disc is arranged on the first valve rod, the compression disc is arranged in the water drainage cavity in a sliding mode and is abutted against the side wall, close to the sliding cavity, of the water drainage cavity, an elastic device is arranged in the water drainage cavity, and the elastic device is connected with the compression disc and used for applying a force to the compression disc to move towards the direction of the sliding cavity;
The push-pull valve comprises a second valve rod and a second valve body, a second valve cavity is arranged in the second valve body, and the second valve rod is arranged in the second valve cavity in a sliding mode;
A fracturing ring groove and a setting ring groove are formed in the side wall of the second valve cavity, the setting ring groove is communicated with the outside through the setting waterway, and the fracturing ring groove is communicated with the outside through the fracturing waterway;
A second central hole is formed in the second valve rod, one end of the second central hole is communicated with the central through hole of the conversion adapter, a second annular water outlet groove is formed in the outer wall of the second valve rod, and the second central hole is communicated with the second annular water outlet groove through a second water outlet hole.
Through the movement of the first valve rod, the first central hole is respectively communicated with the water drainage hole and the water passing channel, so that the conversion between a pressurization state and a pressure relief state is realized; through the removal of second valve rod for the second centre bore respectively with fracturing ring groove and seat seal ring groove intercommunication, and then realize the conversion to fracturing state and seat seal state. The conversion of two kinds of states is all independently gone on, does not influence each other, and then can guarantee to seal the position from sitting when the conversion of fracturing position, can not produce the pressure release of packer, has guaranteed the result of use of packer, has guaranteed experimental accuracy.
In a preferred embodiment of the present invention, the elastic device is a compression spring; one end of the pressure spring is abutted against one side of the compression disc, and the other end of the pressure spring is abutted against the side wall of the water drainage cavity, which is far away from the sliding cavity.
in a preferred embodiment of the present invention, the compression spring is sleeved on the first valve rod.
In a preferred embodiment of the present invention, the drainage hole is disposed at an end of the drainage cavity close to the sliding cavity.
In a preferred embodiment of the present invention, the number of the drain holes is plural, and the plural drain holes are uniformly arranged with a central axis of the first valve body as an axis.
in a preferred embodiment of the present invention, a first sealing ring is disposed on a sidewall of the sliding cavity.
in a preferred embodiment of the present invention, a second exhaust/drain hole communicating with the outside is formed in a side wall of the second valve chamber.
In a preferred embodiment of the present invention, a filter device is disposed on the drain hole.
in a preferred embodiment of the present invention, the filtering device is a filter net.
In a preferred embodiment of the present invention, second sealing rings are disposed on two sides of the fracturing ring groove;
and/or third sealing rings are arranged on two sides of the setting ring groove.
the embodiment of the invention has the beneficial effects that: through the movement of the first valve rod, the first central hole is respectively communicated with the water drainage hole and the water passing channel, so that the conversion between a pressurization state and a pressure relief state is realized; through the removal of second valve rod for the second centre bore respectively with fracturing ring groove and seat seal ring groove intercommunication, and then realize the conversion to fracturing state and seat seal state. The conversion of two kinds of states is all independently gone on, does not influence each other, and then can guarantee to seal the position from sitting when the conversion of fracturing position, can not produce the pressure release of packer, has guaranteed the result of use of packer, has guaranteed experimental accuracy. The hydraulic fracturing ground stress measurement waterway conversion control device provided by the invention has all functions of hydraulic fracturing ground stress measurement setting, fracturing and draining, and completely realizes that the three functions are not interfered with each other, thereby greatly improving the measurement success rate; the stroke distance from setting to fracturing conversion is increased, the device does not bear the huge weight of the drill rod during fracturing, and the limit measurement depth and the measurement success rate are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
fig. 1 is a schematic view of a setting state of a hydraulic fracturing ground stress measurement waterway conversion control device provided in an embodiment of the present invention;
Fig. 2 is a schematic view of a fracturing state of the hydraulic fracturing ground stress measurement waterway conversion control device provided by the embodiment of the invention;
Fig. 3 is a schematic view of a drainage state of the hydraulic fracturing ground stress measurement waterway conversion control device provided by the embodiment of the invention;
Fig. 4 is a schematic view of a push-pull valve in a drainage state of the hydraulic fracturing ground stress measurement waterway conversion control device provided by the embodiment of the invention;
Fig. 5 is a schematic view of a drain valve in a draining state of the hydraulic fracturing ground stress measurement waterway conversion control device provided in the embodiment of the present invention.
in the figure:
1: setting a waterway; 2: a second exhaust drain hole; 3: a second valve body; 4: a second seal ring; 5: fracturing the ring groove; 6: a second valve stem; 7: setting and sealing the ring groove; 8: a third seal ring; 9: a second central aperture; 10: a conversion catcher; 11: a first valve body; 12: a sliding cavity; 13: a first valve stem; 14: a first central aperture; 15: a first seal ring; 16: an annular water outlet groove; 17: compressing the disc; 18: a water drain hole; 19: a pressure spring; 20: a water drainage cavity; 21: an upper end head; 22: a first water outlet; 23: a water passage; 24: a central through hole; 25: a second water outlet; 26: a fracturing water circuit; 27: a first exhaust drain hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
First embodiment
the hydraulic fracturing ground stress measurement waterway conversion control device provided by the invention is suitable for carrying out hydraulic fracturing ground stress measurement in a single-loop deep drill hole with a deep water level or a dry drill hole with a shallow drill hole depth.
In the present invention, the push-pull valve is changed from three to two cavities, and the original water discharge cavity is eliminated, so that the water discharge hole 18 is not formed. After the drainage hole 18 and the drainage cavity are eliminated, the stroke from setting to fracturing can be conveniently lengthened (the stroke is added to 19 cm), the downward stroke of the central rod can be accurately controlled, the drill rod is in a self-lifting state of the drilling machine during fracturing, the pressure relief of the packer is not needed to be worried, and the worry that the packer is burst by weight of the drill rod is avoided.
And after passing through the second central hole 9, the high-pressure water is restricted by the relative position of the second valve rod 6 in the push-pull valve and is respectively communicated with the setting cavity and the fracturing cavity, so that the conversion between the setting state and the fracturing state is realized.
Specifically, the conversion control device for the hydraulic fracturing ground stress measurement waterway is shown in fig. 1-5, and comprises a drain valve, a push-pull valve and a conversion connector 10, wherein the drain valve is connected with the push-pull valve through the conversion connector 10; the water release valve comprises a first valve rod 13 and a first valve body 11, a first valve cavity is arranged in the first valve body 11, and the first valve rod 13 is arranged in the first valve cavity in a sliding mode; the first valve cavity comprises a sliding cavity 12 and a drainage cavity 20, the sliding cavity 12 is communicated with a central through hole 24 of the conversion catcher 10 through a water passage 23, and a drainage hole 18 communicated with the outside is formed in the side wall of the drainage cavity 20; a first central hole 14 is formed in the first valve rod 13, an annular water outlet groove 16 is formed in the side wall of the sliding cavity 12, and the first central hole 14 and the annular water outlet groove 16 can be connected through a first water outlet hole 22; a compression disc 17 is arranged on the first valve rod 13, the compression disc 17 is arranged in the drainage cavity 20 in a sliding mode and is abutted against the side wall, close to the sliding cavity 12, of the drainage cavity 20, an elastic device is arranged in the drainage cavity 20, and the elastic device is connected with the compression disc 17 and used for applying a force to the compression disc 17 to move towards the direction of the sliding cavity 12; the push-pull valve comprises a second valve rod 6 and a second valve body 3, a second valve cavity is arranged in the second valve body 3, and the second valve rod 6 is arranged in the second valve cavity in a sliding mode; a fracturing ring groove 5 and a setting ring groove 7 are arranged on the side wall of the second valve cavity, the setting ring groove 7 is communicated with the outside through a setting waterway 1, and the fracturing ring groove 5 is communicated with the outside through a fracturing waterway 26; a second central hole 9 is formed in the second valve rod 6, one end of the second central hole 9 is communicated with a central through hole 24 of the conversion adapter 10, a second water outlet hole 25 is formed in the outer wall of the second valve rod 6, and the second central hole 9 is communicated with the second water outlet hole 25.
through the movement of the first valve rod 13, the first central hole 14 is respectively communicated with the drain hole 18 and the water passing channel 23, and the conversion between a pressurization state and a pressure relief state is further realized; through the removal of second valve rod 6 for second centre bore 9 communicates with fracturing ring groove 5 and setting ring groove 7 respectively, and then realizes the conversion to fracturing state and setting state. The conversion of two kinds of states is all independently gone on, does not influence each other, and then can guarantee to seal the position from sitting when the conversion of fracturing position, can not produce the pressure release of packer, has guaranteed the result of use of packer, has guaranteed experimental accuracy.
More specifically, when the device is used, the setting waterway 1 at the lower end of the push-pull valve is connected with the packers of the upper packer and the lower packer through a high-pressure hose, the upper end of the first valve rod 13 of the water release valve, namely, the end far away from the push-pull valve is connected with a drill rod, and the axial movement of the first valve rod 13 and the second valve rod 6 is realized under the driving of the drill rod, so that the setting state, the fracturing state and the water release state are changed.
In this embodiment, a sliding cavity 12 and a drainage cavity 20 are arranged in the drainage valve, a first sealing ring 15 is arranged between the drainage cavity 20 and the sliding cavity 12, the first valve rod 13 and the sliding cavity 12 are sealed, and it is avoided that when setting or fracturing is performed, the first central hole 14 is communicated with the drainage cavity 20, so that it is ensured that high-pressure water enters the push-pull valve through the first central hole 14 without pressure relief, and a setting function and a fracturing function are realized.
An elastic device is arranged in the water drainage cavity 20, the elastic device applies a force towards the direction of the sliding cavity 12 to the compression disc 17 on the first valve rod 13 all the time, and then the first valve rod 13 moves upwards relative to the first valve body 11, so that the first central hole 14 is communicated with the water drainage cavity 20, and after pressure relief is completed, the first valve rod 13 can be restored to the initial position under the action of the elastic device.
Specifically, in this embodiment, the elastic device is a compression spring 19, which is sleeved on the first valve rod 13, one end of the compression spring 19 abuts against one side of the compression disc 17, and the other end of the compression spring 19 abuts against a side wall of the drainage cavity 20 away from the sliding cavity 12.
it should be noted that, in the present embodiment, the elastic device is a compression spring 19, but it is not limited to the compression spring 19, and it may also be other elastic devices, such as a spring plate, a torsion spring, etc., that is, it only needs to provide a force to the compression disc 17 in the direction of the sliding cavity 12, so that after the first valve rod 13 moves up relative to the first valve body 11, it can automatically return to the initial state after the external force is removed, and further, the use of setting and fracturing next time is not affected.
Specifically, in this embodiment, the drainage hole 18 is formed in the side wall of the drainage cavity 20, and the drainage hole 18 is formed in one end of the drainage cavity 20 close to the sliding cavity 12, so that when the pressure spring 19 is compressed, the packer can be decompressed through the drainage hole 18 in the drainage cavity 20.
More specifically, in the present embodiment, the number of the drain holes 18 may be one or plural, and the plurality of drain holes 18 are uniformly arranged around the central axis of the first valve body 11.
in this embodiment, be provided with filter equipment on letting out the water body, specifically, filter equipment is middle band-pass hole, pushes down the filter screw device of thin metal mesh, and then can effectually prevent in the drilling mud by the suction block outlet valve open cavity, cause the outlet valve inefficacy.
In the embodiment, the pressure spring 19 in the drain valve can bear 500 kg of pressure when the pressure spring is close to the full compression state, and normally, 60% of the compression stroke of the pressure spring 19 is maximally used, that is, only 300 kg of pressure is borne, so that the normal operation of the pressure spring 19 can be ensured. In the initial packer setting state, the total weight of a push-pull valve and a packer below a drain valve is required to be controlled to be about 100 kilograms, namely the initial compression stroke of a pressure spring 19 is controlled to be about 20 percent of the total stroke, so that the compression stroke of the spring is prevented from exceeding the design, the advance uncontrolled draining of the drain valve is caused, and the setting failure is caused. In the fracturing state, the compression spring 19 is in a non-compression state and is not deformed.
After a setting and fracturing cycle is completed, the packer is filled with high-pressure water, the rubber packer and the hole wall of the drilled hole are pressed together due to the high water pressure, and only when the high-pressure water is discharged, the packer can move after being separated from the hole wall of the drilled hole, and the next measurement section can be carried out. At the moment, the first valve rod 13 of the water draining valve is lifted up through the drill rod, so that the lifting distance is controlled to be about 40% of the compression stroke of the pressure spring 19, and the safe water draining can be realized. Of course, in the abnormal case, the forced water discharge may be realized by using the pressure spring 19 at the time of 100% of the compression stroke.
In a preferred embodiment of the present invention, a second exhaust/drain hole communicating with the outside is formed in a side wall of the second valve chamber.
Specifically, the second exhaust drain hole 2 is arranged on one side of the fracturing ring groove 5 far away from the setting ring groove 7, and when the second valve rod 6 slides freely in the axial direction, the second valve cavity can be communicated with the outside, so that the internal pressure and the external pressure of the lower end of the second valve cavity are the same, and the normal free sliding of the second valve rod 6 is ensured.
Similarly, a first exhaust and drainage hole 27 is formed in the first valve cavity, specifically, the sliding cavity 12, for ensuring the normal free sliding of the first valve rod 13.
During the drilling and the measurement, the mud in the drill hole is sucked into the lower space of the second cavity of the push-pull valve due to the pumping action of the second valve rod 6 sliding in the push-pull valve, so that the second cavity is easily blocked.
In view of the above circumstances in practical use, a filtering device, specifically, a filtering screw device with a through hole in the middle and a pressing metal net is also provided in the second exhaust/drain hole 2.
note that the filter device of the second exhaust-water discharge hole 2 may have the same structure as the filter device of the drain hole 18, or may have a different structure as long as the filter function is achieved.
Simultaneously, in this embodiment, in order to avoid setting annular 7 and fracturing annular 5 intercommunication for setting state and fracturing state are chaotic, have set up second sealing washer 4 in the left and right sides of fracturing annular 5, have set up third sealing washer 8 in the left and right sides of setting annular 7.
the application process of the hydraulic fracturing ground stress measuring waterway conversion device provided by the invention is as follows:
The two parts of the device, namely the push-pull valve and the drain valve, are connected together through a conversion connector 10, wherein the push-pull valve is arranged at the lower part, and the drain valve is arranged at the upper part. The setting waterway 1 and the fracturing waterway 26 at the lower part of the push-pull valve are respectively connected into the setting waterway and the fracturing waterway of the packer, the upper part of the first valve rod 13 is connected with a drill rod through an upper end head 21, and a combined body formed by the bridging packer, the push-pull valve and the drain valve is placed to the target testing depth of the drilled hole through the drill rod.
under the action of the self weight of the combination formed by the packer, the push-pull valve and the drain valve, the second valve rod 6 is pulled to the uppermost end of the push-pull valve, as shown in fig. 1, at the moment, the push-pull valve is in a setting state, and the drain valve is in a sealed water passing state (non-draining state). The high-pressure water pump on the outer surface of the drilled hole injects water into the sealed drill rod, the water body passes through the first central hole 14 of the first valve rod 13, then passes through the first water outlet hole 22, enters the annular water outlet groove 16, then enters the second valve rod 6 through the water passage 23 and the conversion adapter 10, flows out of the second water outlet hole 25 of the second valve rod 6, enters the setting ring groove 7 of the push-pull valve, then enters the setting sealed rubber cavity of the packer through the setting ring groove 7 and the setting water passage 1, the packer expands under the action of water pressure and is tightly fixed on the wall of the drilled hole, the drilled hole section between the upper packer and the lower packer is sealed and isolated, and the sealed cavity is formed to be used as a measuring section for hydraulic fracturing.
After the packer is sealed, under the control of power lifting of the drilling machine, the drill rod is slowly lifted to 19 cm, in the descending distance interval, the second water outlet 25 of the second valve rod 6 can be ensured to descend to the position communicated with the fracturing ring groove 5, and meanwhile, the huge weight of the drill rod can be ensured to be in the state of being lifted by the power of the drilling machine, the rubber sleeve of the packer can not be pressed, the huge weight of the drill rod is prevented from being pressed onto the rubber sleeve of the packer, the rubber sleeve caused bursts, and the failure of measurement is avoided.
In this state, the push-pull valves are all in a fracturing state, the ground high-pressure pump injects water into the high-pressure water passage, the water enters the second central hole 9 of the second valve rod 6 of the push-pull valve from the drain valve, flows into the fracturing ring groove 5 through the second water outlet 25, and then enters the sealed hydraulic fracturing test section in the drill hole through the fracturing water passage 26 of the push-pull valve and the packer. At this point, the test section may be subjected to fracture measurements.
After the fracturing measurement is finished, the high-pressure water in the rubber sleeve of the packer needs to be discharged, and then the measurement of the next measurement section can be carried out. At the moment, the drill rod needs to be lifted upwards, at the moment, the push-pull valve is changed into a setting state from a fracturing state, then the drill rod is continuously lifted upwards, the compression spring 19 is pressed by the compression disc 17 of the first valve rod 13, the first water outlet 22 of the first valve rod 13 is enabled to move upwards into the water discharge cavity 20 at the upper part of the water discharge valve, the lifting distance is controlled to be about 40% of the compression stroke of the compression spring 19, the high-pressure water in the packer can be discharged from the water discharge hole, and the water discharge and pressure relief of the packer are achieved.
and after draining is finished, the packer is contracted to an original state. And the measuring device can move to the next measuring section to carry out measurement.
In summary, the first central hole 14 is respectively communicated with the water drainage hole 18 and the water passing channel 23 by the movement of the first valve rod 13, so that the conversion between the pressurization state and the pressure relief state is realized; through the removal of second valve rod 6 for second centre bore 9 communicates with fracturing ring groove 5 and setting ring groove 7 respectively, and then realizes the conversion to fracturing state and setting state. The conversion of two kinds of states is all independently gone on, does not influence each other, and then can guarantee to seal the position from sitting when the conversion of fracturing position, can not produce the pressure release of packer, has guaranteed the result of use of packer, has guaranteed experimental accuracy. The hydraulic fracturing ground stress measurement waterway conversion control device provided by the invention has all functions of hydraulic fracturing ground stress measurement setting, fracturing and draining, and completely realizes that the three functions are not interfered with each other, thereby greatly improving the measurement success rate; the stroke distance from setting to fracturing conversion is increased, the device does not bear the huge weight of the drill rod during fracturing, and the limit measurement depth and the measurement success rate are greatly improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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. The conversion control device for the hydrofracturing ground stress measurement waterway is characterized by comprising a water drain valve, a push-pull valve and a conversion catcher, wherein the water drain valve is communicated with the push-pull valve through the conversion catcher;
The water release valve comprises a first valve rod and a first valve body, a first valve cavity is arranged in the first valve body, and the first valve rod is arranged in the first valve cavity in a sliding mode;
The first valve cavity comprises a sliding cavity and a water drainage cavity, the sliding cavity is communicated with the central through hole of the conversion catcher through a water passing passage, and a water drainage hole communicated with the outside is formed in the side wall of the water drainage cavity;
A first central hole is formed in the first valve rod, an annular water outlet groove is formed in the side wall of the sliding cavity, and the first central hole and the annular water outlet groove can be connected through a first water outlet hole;
A compression disc is arranged on the first valve rod, the compression disc is arranged in the water drainage cavity in a sliding mode and is abutted against the side wall, close to the sliding cavity, of the water drainage cavity, an elastic device is arranged in the water drainage cavity, and the elastic device is connected with the compression disc and is used for applying a force to the compression disc, wherein the force moves towards the direction of the sliding cavity;
the push-pull valve comprises a second valve rod and a second valve body, a second valve cavity is arranged in the second valve body, and the second valve rod is arranged in the second valve cavity in a sliding mode;
A fracturing ring groove and a setting ring groove are arranged on the side wall of the second valve cavity, the setting ring groove is communicated with the outside through a setting waterway, and the fracturing ring groove is communicated with the outside through a fracturing waterway;
A second central hole is formed in the second valve rod, one end of the second central hole is communicated with the central through hole of the conversion adapter, a second water outlet hole is formed in the outer wall of the second valve rod, and the second central hole is communicated with the second water outlet hole;
Through the movement of the first valve rod, the first central hole is respectively communicated with the water drainage hole and the water passing channel, so that the conversion between a pressurization state and a pressure relief state is realized; through the removal of second valve rod for the second centre bore respectively with fracturing ring groove with set ring groove intercommunication, and then realize the conversion to fracturing state and set state.
2. the apparatus for controlling conversion of a hydrofracturing ground stress measuring waterway of claim 1, wherein the resilient means is a compression spring; one end of the pressure spring is abutted against one side of the compression disc, and the other end of the pressure spring is abutted against the side wall of the water drainage cavity, which is far away from the sliding cavity.
3. the device for controlling conversion of a hydrofracturing ground stress measuring waterway according to claim 2, wherein the pressure spring is sleeved on the first valve rod.
4. The apparatus for controlling conversion of a hydrofracturing ground stress measuring waterway according to claim 1, wherein the drainage hole is disposed at an end of the drainage cavity near the sliding cavity.
5. The apparatus for switching and controlling a hydraulic fracturing ground stress measuring waterway according to claim 1, wherein the plurality of drain holes are uniformly arranged with a central axis of the first valve body as an axis.
6. The apparatus for controlling conversion of a hydrofracturing ground stress measuring waterway according to claim 1, wherein a first sealing ring is disposed on a side wall of the sliding cavity.
7. The device for controlling conversion of a hydraulic fracturing ground stress measuring waterway according to claim 1, wherein a second exhaust hole communicated with the outside is formed in a side wall of the second valve chamber.
8. The apparatus for controlling conversion of a hydrofracturing ground stress measuring waterway according to claim 1, wherein the drain hole is provided with a filtering device.
9. The apparatus for controlling conversion of a hydrofracturing ground stress measuring waterway of claim 8, wherein the filtering means is a filter screen.
10. The device for controlling conversion of a hydrofracturing ground stress measuring waterway according to claim 1, wherein second sealing rings are arranged on two sides of the fracturing ring groove;
And/or the presence of a gas in the gas,
and third sealing rings are arranged on two sides of the setting ring groove.
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