CN210829214U - Push-pull switch assembly capable of eliminating system flexibility - Google Patents

Abstract

A push-pull switch assembly capable of eliminating system flexibility comprises a push-pull valve core and a push-pull switch, wherein the push-pull valve core can be tightly matched with the push-pull switch sleeved on the outer side of the push-pull valve core, and the push-pull valve core can move relative to the push-pull switch along the axis direction; a central water channel of the push-pull valve core is arranged in the middle of the interior of the push-pull valve core along the axis direction; through the movement of the push-pull valve core in the push-pull switch, the switching communication between the central water channel of the push-pull valve core and at least two different water channel interfaces arranged on the push-pull switch can be realized; when the push-pull valve core moves to a specific position in the push-pull switch, the central water channel of the push-pull valve core can be sealed and is not communicated with any water channel on the push-pull switch. The push-pull switch assembly reduces errors caused by the flexibility of high-pressure water in the hydrofracturing measuring device in the measuring process through improvement of the push-pull switch water channel, can remarkably improve the measuring precision, can provide required measuring water pressure in different forms for the hydrofracturing measuring device in the fracturing process, and improves the reliability of measuring results.

Description

Push-pull switch assembly capable of eliminating system flexibility

Technical Field

The utility model relates to a push-and-pull switch subassembly especially relates to a push-and-pull switch subassembly that is arranged in hydrofracturing measuring device can eliminate system's compliance.

Background

The hydraulic fracturing method is a ground stress measuring method, and equipment used for measurement is a hydraulic fracturing measuring device. During measurement, firstly, drilling is carried out on bedrock, and then the upper end and the lower end of a corresponding fracturing section are sealed by an upper packer and a lower packer. Pressurized fluid is then injected until the formation fractures and the change in pressure over time is recorded so that the conditions for achieving the earth stress can be calculated. As the technology advances, people hope to know the fracture direction and the like more so as to obtain the state of the ground stress more accurately, so that an impression system or a downhole television is used for observing the fracture condition. And after observation, according to the recorded measurement parameters such as fracture pressure, pump-off pressure and the like, and fracture information such as fracture direction and the like, calculating the magnitude and direction of the stress by using a corresponding formula.

The flexibility is a concept of mechanics, and refers to the size of deformation of a component along a vertical axial direction under the condition of axial stress, and the flexibility of water, namely the size of deformation of the component in a specific direction when the water is extruded reflects the change of water extraction. Because inside the hydraulic fracturing measuring device, the effect will be acted on to the high pressure water in the water course, consequently when realizing hydraulic fracturing and measuring the water pressure in the fracturing section through the fracturing section, the compliance of high pressure water can cause the unstability of pressure measurement result, for example, can make key parameter re-tensioning pressure that obtains the crustal stress measured value etc. can not accurately represent the pressure value when true crack is re-tensioned. In addition, when the prior art measures the water pressure in the fracturing section in the hydraulic fracturing process, the water channel in the measuring device is always connected with the high-pressure water source to continuously provide the required high-pressure water for the measuring device, however, because the water flow which can be provided by the high-pressure water source is relatively large, the water pressure is increased instantly in the measuring process, and the accurate measurement in the fracturing process is difficult to realize. Therefore, in order to solve the problem that the prior art often causes unreliable test results, the hydraulic fracturing measuring device needs to be improved, and the measuring accuracy is improved.

SUMMERY OF THE UTILITY MODEL

Aiming at the technical problems, the push-pull switch assembly increases the structure of the water channel sealing inside the push-pull valve core by improving the push-pull switch water channel so as to reduce the influence of the flexibility of water on the measurement result of the whole device; meanwhile, a water channel opening communicated with the fracturing water channel is further added on the push-pull switch, so that the push-pull switch can be communicated with the fracturing water channel through different water channel openings or different connection modes, and high-pressure water is provided for the fracturing water channel in different modes. In the overall effect, the push-pull switch assembly can reduce errors caused by the flexibility of high-pressure water in the hydrofracturing measuring device to measurement through a relatively simple structure in the measuring process, and can remarkably improve the measuring precision; meanwhile, the required measuring water pressure can be provided in different forms in the fracturing process of the hydraulic fracturing measuring device, and the accuracy and the reliability of the measuring result are further improved.

The push-pull switch assembly comprises a push-pull valve core and a push-pull switch, wherein the push-pull valve core can be mutually and tightly matched with the push-pull switch sleeved on the outer side of the push-pull valve core, and the push-pull valve core can move relative to the push-pull switch along the axis direction; a central water channel of the push-pull valve core is arranged in the middle of the interior of the push-pull valve core along the axis direction; through the movement of the push-pull valve core in the push-pull switch, the switching communication between the central water channel of the push-pull valve core and at least two different water channel interfaces arranged on the push-pull switch can be realized; when the push-pull valve core moves to a specific position in the push-pull switch, the central water channel of the push-pull valve core can be sealed and is not communicated with any water channel on the push-pull switch.

Preferably, the push-pull valve core is also provided with at least one push-pull valve core transverse water channel, one end of the push-pull valve core transverse water channel is communicated with the push-pull valve core central water channel, and the other end of the push-pull valve core transverse water channel is communicated with the outer side of the push-pull valve core and is communicated with the outer side of the push-pull valve core; the transverse water channel of the push-pull valve core is used for realizing switching communication between the central water channel of the push-pull valve core and at least two different water channel interfaces arranged on the push-pull valve core.

Preferably, at least two sets of spaced sealing rings are arranged between the push-pull valve core and the push-pull switch, and when the push-pull valve core transverse water channel moves to a position between the at least two sets of spaced sealing rings, the push-pull valve core transverse water channel is sealed by the at least two sets of spaced sealing rings, so that the push-pull valve core central water channel can be sealed and is not communicated with any water channel on the push-pull switch.

Preferably, a switching side water channel is formed on the side wall of the push-pull switch, the switching side water channel is provided with at least one switching side water channel interface, one end of the switching side water channel interface is communicated with the switching side water channel, and the other end of the switching side water channel interface penetrates out of the inner wall of the push-pull switch and can be communicated with the transverse water channel of the push-pull valve core.

Preferably, two switching side water channel interfaces are formed on the side wall of the push-pull switch, and the two switching side water channel interfaces are arranged on the side wall of the push-pull switch at intervals; wherein, the interface that is located the upside relatively is switching side water course upper junction, and the interface that is located the downside relatively is switching side water course lower junction.

Preferably, the upper joint of the switching side water channel is positioned on the upper sides of the at least two groups of spaced sealing rings, and the lower joint of the switching side water channel is positioned on the lower sides of the at least two groups of spaced sealing rings.

Preferably, the inner diameter of the lower port of the switching-side waterway is smaller than the inner diameter of the upper port of the switching-side waterway.

Preferably, the inner diameter of the switching side water channel lower interface is set to be large, so that when the push-pull valve core transverse water channel is communicated with the switching side water channel lower interface, the water pressure in the fracturing water channel communicated with the switching side water channel can only be increased or decreased in a slowly changing mode.

Preferably, a plug is arranged at the bottom opening position of the central water channel of the push-pull valve core, and the plug can be detachably connected to the bottom opening position and used for detachably sealing the bottom opening.

Preferably, the push-pull switch is composed of a push-pull switch upper part, a push-pull switch middle part and a push-pull switch lower part; at least one push-pull switch middle side water channel arranged along the axis direction is formed in the side wall of the push-pull switch middle part, and a push-pull switch middle side water channel interface is arranged at the upper end of the push-pull switch middle side water channel so that the push-pull switch middle side water channel can be communicated with the push-pull valve core transverse water channel; at least one switching side water channel is arranged in the side wall of the lower part of the push-pull switch along the axis direction; when the push-pull valve core and the push-pull switch move relatively, the transverse water channel of the push-pull valve core can be respectively communicated with one of the side water channel interfaces or the switching side water channel interfaces of the push-pull switch, and other water channel interfaces in the push-pull switch are sealed at the same time.

Preferably, at least one drainage channel interface arranged transversely is further formed on the inner wall of the middle part of the push-pull switch, the drainage channel interface is connected with the drainage channel and penetrates through the side wall of the middle part of the push-pull switch, the drainage channel interface can enable the drainage channel to be communicated with the transverse water channel of the push-pull valve core, and the other end of the drainage channel penetrates out of the side wall of the middle part of the push-pull switch.

Preferably, the drainage water channel is located near an opening on an outer wall of the middle portion of the push-pull switch, and a filter device is arranged and used for preventing sediment outside the opening from entering the drainage water channel.

Preferably, the filtering device is an annular structure, at least one drainage hole is arranged on the surface of the annular structure, and the filtering component is arranged in the drainage hole.

Preferably, when the push-pull valve core and the push-pull switch move relatively, the transverse water channel of the push-pull valve core can be respectively communicated with one of the side water channel interface, the drainage water channel interface, the switching side water channel upper interface or the switching side water channel lower interface of the push-pull switch, and other water channel interfaces in the push-pull switch can be simultaneously sealed.

Preferably, a separation beam is arranged in the lower part of the push-pull switch, and the separation beam separates a cavity in the lower part of the push-pull switch into an upper part and a lower part; the upper part of the cavity is used for accommodating the push-pull valve core to slide in the lower part of the push-pull switch; the lower part of the cavity forms a groove which is used for accommodating and connecting other components.

Preferably, the transfer side waterway may be capable of communicating with the inside of the groove.

Preferably, at least one push-pull switch lower water passage is further formed in the push-pull switch lower side wall along the axial direction, and the push-pull switch lower water passage is capable of communicating with the push-pull switch lower water passage.

Preferably, the upper part of the push-pull switch, the middle part of the push-pull switch and the lower part of the push-pull switch are detachably connected in a sealing manner.

Preferably, the switching side water channel is communicated with a fracturing water channel, and the fracturing water channel is used for realizing a hydraulic fracturing effect.

Preferably, the push-pull switch lower side water channel is communicated with a seat sealing water channel, and the seat sealing water channel is used for expanding the surface layer of the packer or the die assembly.

Compared with the prior art, the beneficial effects of the utility model reside in that: through the improvement to push-and-pull switch water course, reduce the error that the compliance of water under high pressure in the hydrofracturing measuring device brought in the measurement process, can show improvement measurement accuracy. Meanwhile, the required measuring water pressure can be provided in different forms in the fracturing process of the hydraulic fracturing measuring device, and the accuracy and the reliability of the measuring result are further improved.

Drawings

FIG. 1: the push-pull switch assembly is in a sealed state.

FIG. 2 is a drawing: the push-pull switch assembly is in an overall structural schematic diagram of a connection measurement state.

FIG. 3: part A is a schematic structural diagram.

FIG. 4 is a drawing: and B is a schematic structural diagram.

FIG. 5: and part C is a schematic structural diagram.

FIG. 6: part D is a schematic structural diagram.

Detailed Description

As shown in fig. 1 to 6, for convenience of description, according to the push-pull switch assembly in the enclosed state and the connection measurement state, for convenience of detail, in the drawings, the push-pull switch assembly in the enclosed state is divided into two parts AB, and the push-pull switch assembly in the connection measurement state is divided into two parts CD, which will be described in detail below.

The push-pull switch assembly 1 according to the embodiment comprises a push-pull valve core 1100 and a push-pull switch 1200, wherein the push-pull valve core 1100 can be tightly matched with the push-pull switch 1200 sleeved on the outer side of the push-pull valve core 1100, and the push-pull valve core 1100 can move relative to the push-pull switch 1200 along the axial direction; a central water channel 1101 of the push-pull valve core is arranged in the middle of the interior of the push-pull valve core 1100 along the axial direction; through the movement of the push-pull valve core 1100 in the push-pull switch 1200, the switching communication between the push-pull valve core central water channel 1101 and at least two different water channel interfaces arranged on the push-pull switch 1200 can be realized; when the push-pull spool 1100 moves to a particular position within the push-pull switch 1200, the push-pull spool central water passage 1101 can be sealed and not communicate with any water passage on the push-pull switch.

Therefore, the high-pressure water in the central water channel 1101 of the push-pull valve core can be completely isolated from the water channels downstream, so that the measurement result of the water pressure in the fracturing water channel of the hydraulic fracturing measurement device is prevented from being influenced by the flexibility of the central water channel 1101 of the push-pull valve core and the high-pressure water upstream, and the accuracy of the measurement result of the fracturing section is improved.

As shown in fig. 3-6, the push-pull valve core 1100 is further provided with at least one push-pull valve core transverse water channel 1102, one end of the push-pull valve core transverse water channel 1102 is communicated with the push-pull valve core central water channel 1101, and the other end of the push-pull valve core transverse water channel 1102 is communicated with the outer side of the push-pull valve core 1100 by penetrating through the outer side wall of the push-pull valve core 1100; the push-pull spool transverse water channel 1102 is used for realizing switching communication between the push-pull spool central water channel 1101 and at least two different water channel interfaces arranged on the push-pull switch 1200.

When the push-pull valve core 1100 moves in the axial direction inside the push-pull switch 1200, the push-pull valve core transverse water channel 1102 can be selectively and uniquely connected with each water channel interface formed on the side wall of the push-pull switch 1200; that is, with the movement of the push-pull valve core 1100, the push-pull valve core transverse water channel 1102 can be communicated with one of the water channel interfaces, and simultaneously, is mutually sealed with other water channel interfaces and cannot be communicated. Preferably, the push-pull valve core 1100 and the push-pull switch 1200 can be tightly fitted to each other.

Further, at least two sets of spaced sealing rings are disposed between the push-pull valve core 1100 and the push-pull switch 1200, as shown in fig. 4, when the push-pull valve core transverse water passage 1102 moves to between two sets of spaced first sealing rings 1207, the push-pull valve core transverse water passage 1102 is sealed by the first sealing rings 1207. At this time, when the high-pressure water from the push-pull valve core center water passage 1101 is discharged from the push-pull valve core lateral water passage 1102 to the outside of the push-pull valve core 1100, both upper and lower sides are sealed by the first seal ring 1207. Thereby, the push-pull valve core central water channel 1101 is sealed, and the high-pressure water inside the push-pull valve core central water channel 1101 cannot be communicated with any other water channel through the push-pull valve core transverse water channel 1102, namely, the push-pull valve core central water channel 1101 cannot be communicated with any water channel on the push-pull switch. Preferably, the first seal 1207 is provided on an inner sidewall of the push-pull switch 1200, is movable relative to the push-pull valve element 1100, and seals a gap between the push-pull valve element 1100 and the push-pull switch 1200.

At this time, by the above arrangement among the first seal ring 1207, the push-pull valve core 1100 and the push-pull switch 1200, the high-pressure water in the push-pull valve core central water passage 1101 communicated with the high-pressure water source and the high-pressure water in the upstream water passage communicated with the push-pull valve core central water passage 1101 are isolated from the downstream water passage, so that the influence of the flexibility of the high-pressure water in the push-pull valve core central water passage 1101 and the upstream water passage thereof on the measurement result of the downstream water passage is eliminated.

A switching side water channel 1204 is formed on the side wall of the push-pull switch 1200, and the switching side water channel 1204 is provided with a switching side water channel upper interface 1205 and a switching side water channel lower interface 1206. The switching side water channel upper interface 1205 penetrates through the inner wall of the upper side of the two groups of first sealing rings 1207, the switching side water channel lower interface 1206 penetrates through the inner wall of the lower side of the two groups of first sealing rings 1207, and when the push-pull valve core 1100 moves relatively relative to the push-pull switch 1200 along the axial direction, the push-pull valve core transverse water channel 1102 can be communicated with the switching side water channel upper interface 1205 or the switching side water channel lower interface 1206 respectively. Preferably, a second sealing ring 1214 is arranged on the inner wall position on the upper side of the switching side water channel upper interface 1205; and a third sealing ring 1215 is arranged on the inner wall of the lower side of the switching side water channel lower connector 1206. The second seal 1214 and the third seal 1215 are used for sealing a gap between the push-pull valve core 1100 and the inner wall of the push-pull switch 1200, so as to ensure that the push-pull valve core transverse water channel 1102 can be independently communicated with one of the changeover-side water channel upper interface 1205 or the changeover-side water channel lower interface 1206.

Preferably, referring to fig. 4 and 6, the switching side water channel 1204 is disposed on the sidewall of the push-pull switch 1200 along a direction parallel to the axis, the lower end of the switching side water channel 1204 is capable of communicating with a downstream fracturing water channel, and the downstream fracturing water channel is configured to apply pressure to an underground rock wall at a position to be tested through a fracturing section, so as to achieve a hydraulic fracturing effect. Preferably, the lower end of the switching side water channel 1204 is communicated with an upper packer center water channel 201 of the upper packer 2, and the upper packer center water channel 201 is arranged in an upper packer center rod 202 of the upper packer 2 along the central axis. Therefore, the switching side water channel 1204 can be communicated with an internal water channel of a downstream fracturing section, and is used for realizing a hydraulic fracturing effect on a position to be measured underground through the fracturing section.

In some embodiments, the inner diameter of the transition-side waterway lower interface 1206 is smaller than the inner diameter of the transition-side waterway upper interface 1205. Therefore, the push-pull switch assembly 1 can realize different connection modes between the push-pull valve core central water channel 1101 and the water channel in the fracturing section through the switching side water channel upper interface 1205 and the switching side water channel lower interface 1206 with different inner diameters. When the underground position to be measured is measured, the transverse water channel 1102 of the push-pull valve core is preferably communicated with the lower joint 1206 of the water channel at the switching side, so that high-pressure water is provided for the fracturing section through relatively small water quantity, the water pressure measurement value of the underground position to be measured is slowly increased, and an accurate result of rock wall information of the underground position to be measured is obtained.

In some embodiments, the push-pull valve core central water channel 1101 penetrates through both ends of the push-pull valve core 1100 along a central axis thereof, and a plug 1103 is disposed at a bottom opening position of the push-pull valve core central water channel 1101, wherein the plug 1103 is detachably connectable to the bottom opening position for detachably sealing the bottom opening. Preferably, the plug 1103 is connected with the bottom port of the central water channel 1101 of the push-pull valve core through a thread structure. The plug 1103 is preferably a screw, and the screw can be connected with the thread inside the bottom opening in a sealing manner, so as to seal the bottom opening.

Because the hydrofracturing measuring device is a device for measuring the properties of the rock wall underground, silt is easy to deposit in the central water channel 1101 of the push-pull valve core, and if too much silt is deposited, the normal use of the hydrofracturing measuring device is affected. The plug 1103 can detachably seal the bottom opening of the push-pull valve core central water channel 1101, and when the plug 1103 is removed, openings are formed at two ends of the push-pull valve core central water channel 1101, so that the push-pull valve core central water channel 1101 can be conveniently cleaned.

The specific structure of this embodiment is that, as shown in fig. 3 and 5, the hydraulic fracturing measuring device is provided with an upper connector 3, the upper connector 3 is provided with an upper opening 301, and the upper opening 301 is used for connecting with a high-pressure water source. Preferably, the connection between the upper opening 301 and the high pressure water source is provided by a drill pipe or well rod. The middle part of the inside of the upper joint 3 is provided with an upper joint central water channel 302 along the axial direction, and one end of the upper joint central water channel 302 is communicated with the opening 301. The upper joint 3 can be connected with the upper end of the push-pull valve core 1100 through a thread structure, when the upper joint 3 is connected with the push-pull valve core 1100, the other end of the upper joint 3 can be communicated with the push-pull valve core central water channel 1101, and the push-pull valve core central water channel 1101 penetrates through two ends of the push-pull valve core 1100 along the central axis thereof.

As shown in fig. 3 to 6, a push-pull switch 1200 is sleeved on an outer side of the push-pull valve core 1100, and the push-pull switch 1200 is integrally in a cylindrical sleeve-shaped structure and has an inner cavity capable of accommodating the push-pull valve core 1100. The outer side wall of the push-pull valve core 1100 can be tightly matched with the inner side wall of the push-pull switch 1200, and the push-pull valve core 1100 can move relative to the push-pull switch 1200 along the axial direction.

The push-pull switch 1200 includes a push-pull switch upper portion 1201, a push-pull switch upper portion 1202, and a push-pull switch lower portion 1203. A limit flange 1208 protruding inward is provided near the upper end of the upper push-pull switch part 1201, and the inner diameter of the limit flange 1208 is slightly smaller than the outer diameter of a limit boss 1104 on the outer wall of the push-pull valve core 1100. Therefore, when the push-pull valve body 1100 is pulled up with respect to the push-pull switch 1200, the stopper flange 1208 can abut against the stopper boss 1104 on the outer wall of the push-pull valve body 1100, and the maximum pulled-out positions of the push-pull switch 1200 and the push-pull valve body 1100 are restricted.

The inner side wall of the upper push-pull switch portion 1201 near the lower end is provided with threads for meshing with the threads on the outer side wall of the upper push-pull switch portion 1202 near the upper end, so that the upper push-pull switch portion 1201 and the upper push-pull switch portion 1202 are fixedly connected. A circle of transverse platform 1209 is formed on the inner wall of the upper part 1201 of the push-pull switch at the position of the upper side of the thread. When the push-pull switch middle part 1202 and the push-pull switch upper part 1201 are locked by the threads engaged with each other, an axially symmetrical annular space can be formed between the transverse platform 1209 of the push-pull switch upper part 1201 and the upper side end surface 1210 of the push-pull switch middle part 1202, and the annular space forms a push-pull switch upper annular water channel 1211. An annular groove 1212 is formed in the inner side wall of the upper push-pull switch portion 1201, which is located near the annular water channel 1211 of the upper push-pull switch portion, an annular groove 1213 is formed in the inner side wall of the upper push-pull switch portion 1202, which is located near the annular water channel 1211 of the upper push-pull switch portion, and the annular grooves 1212 and 1213 form a lateral water channel interface of the push-pull switch, which is used for enlarging the water channel area corresponding to the lateral water channel 1102 of the push-pull valve element, so as to improve the fault-tolerant space when the lateral water channel 1102 of the push-pull valve element and the annular water channel 1211 are communicated with each other, and the push-pull valve element 1100 is conveniently pushed and. At least one group of fourth sealing rings 1216 are arranged on the upper side of the annular groove 1212 and between the push-pull valve core 1100 and the push-pull switch upper part 1201; at least one set of fifth sealing rings 1217 is disposed between the push-pull valve core 1100 and the push-pull switch inner portion 1202 under the annular groove 1213.

The push-pull switch middle part 1202 is of a cylindrical sleeve-shaped structure as a whole, at least one push-pull switch middle side water channel 1218 which penetrates through the push-pull switch middle part along the axial direction is formed in the side wall of the push-pull switch middle part 1202, an upper end opening of the push-pull switch middle side water channel 1218 is communicated with the push-pull switch upper annular water channel 1211, and a lower end opening of the push-pull switch middle side water channel 1218 is communicated with a push-pull switch lower annular water channel 1219 formed between the push-pull switch middle part 1202 and the push-pull. At least one drainage channel 1220 is formed in the vicinity of the middle portion of the side wall of the push-pull switch middle portion 1202, and the drainage channel 1220 is not communicated with the push-pull switch middle side channel 1218. The drainage channel 1220 transversely penetrates through the side wall of the middle part 1202 of the push-pull switch, an opening on one side of the inner wall of the middle part 1202 of the push-pull switch forms a drainage channel interface, the drainage channel interface can enable the drainage channel to be communicated with the transverse channel of the push-pull valve core, and the other end of the drainage channel 1220 is communicated with the outside of the middle part of the push-pull switch. When the push-pull valve core 1100 moves to the push-pull valve core transverse water channel 1102 to communicate with the drain water channel 1220, water in the push-pull valve core central water channel 1101 can be discharged from the drain water channel 1220. The fifth seal ring 1217 is provided on the inner wall of the push-pull switch inner portion 1202 on the upper side of the drain water passage 1220, and the second seal ring 1214 is provided on the inner wall of the push-pull switch inner portion 1202 on the lower side of the drain water passage 1220.

Preferably, the drain water passage 1220 is provided with a filter 1221 in the vicinity of an opening position on an outer wall of the push-pull switch inner portion 1202. The filtering device 1221 is preferably a ring structure, a plurality of drainage holes 1222 are disposed on the surface of the ring structure, and a filtering member is disposed in the drainage holes 1222.

Threads are arranged on the outer walls of two ends of the middle part 1202 of the push-pull switch, the threads on the upper end of the middle part 1202 of the push-pull switch are used for being connected with the threads on the inner wall of the lower end part of the upper part 1201 of the push-pull switch, and a sealing ring is arranged near the threaded connection position of the middle part 1202 of the push-pull switch and the upper part 1201 of the push-pull switch; the lower end of the push-pull switch inner part 1202 is screwed to the upper end of the push-pull switch lower part 1203, and a seal ring is provided near the screwed position between the push-pull switch inner part 1202 and the push-pull switch lower part 1203.

A push-pull switch lower side water passage 1223 is formed inside a side wall of the push-pull switch lower portion 1203, and the push-pull switch lower side water passage 1223 extends in a parallel axis direction inside the side wall of the push-pull switch lower portion 1203. The push-pull switch lower side water passage 1223 can communicate with a downstream seat seal water passage for inflating the surface layer of the packer or die assembly. Preferably, the upper end of the push-pull switch lower side water passage 1223 is communicated with the push-pull switch lower annular water passage 1219, and the lower end thereof is communicated with the upper packer inner water passage 203, so as to inflate the surface layer of the upper packer 2.

Referring to fig. 4 and 6, the lower portion 1203 of the push-pull switch has a dividing beam 1224 inside, and the dividing beam 1224 divides the cavity inside the lower portion 1203 of the push-pull switch into an upper portion and a lower portion. The upper part of the cavity is used for accommodating the push-pull valve core 1100 to slide in the push-pull switch lower part 1203, and the lower part of the cavity forms a groove which is used for accommodating and connecting with other parts. Preferably, the groove is used in connection with the upper packer 2.

It can be seen that, referring to fig. 3-6, when the push-pull valve core 1100 slides in the push-pull switch 1200 until the push-pull valve core transverse water passage 1102 is communicated with the push-pull switch upper annular water passage 1211, the high-pressure water from the high-pressure water source flows through the push-pull valve core transverse water passage 1102 sequentially from the upper joint central water passage 302 and the push-pull valve core central water passage 1101, and further enters the seat seal water passage through the push-pull switch upper annular water passage 1211, the push-pull switch middle side water passage 1218 and the push-pull switch lower side water passage 1223, so that the surface layer of the packer or stamp assembly is expanded by the pressure of the high-pressure. At this time, the push-pull valve core 1100 and the sealing rings arranged between the outer wall of the push-pull valve core 1100 and the inner wall of the push-pull switch 1200 ensure that the interfaces of other water channels are all in a closed state, that is, ensure that the other water channels are all in a closed state.

Referring to fig. 3 to 6, when the push-pull valve core 1100 slides in the push-pull switch 1200 until the push-pull valve core transverse water channel 1102 is communicated with the drainage water channel 1220, the water in the upper joint central water channel 302 and the push-pull valve core central water channel 1101 is drained to the outside of the hydraulic fracturing measurement device through the drainage water channel 1220 and the drainage hole 1222, so as to drain the excess water inside the device.

When the push-pull valve core 1100 slides in the push-pull switch 1200 until the push-pull valve core transverse water channel 1102 is communicated with the switching side water channel upper interface 1205, high-pressure water from the high-pressure water source sequentially flows through the push-pull valve core transverse water channel 1102 and the switching side water channel upper interface 1205 into the fracturing water channel from the upper joint central water channel 302 and the push-pull valve core central water channel 1101. And high-pressure water is discharged to the outside through the fracturing section and is injected into the space to be tested outside the fracturing section so as to realize the hydraulic fracturing effect on the surrounding rock wall.

When the push-pull valve core 1100 slides in the push-pull switch 1200 to a position spaced between the two sets of first sealing rings 1207, that is, when the push-pull valve core 1100 moves to the position shown in fig. 3 and 4, the upper and lower sides of the push-pull valve core transverse water passage 1102 are sealed by the two sets of first sealing rings 1207, so that high-pressure water inside the push-pull valve core central water passage 1101 cannot be discharged to the outside, that is, at this time, the high-pressure water inside the joint central water passage 302 and the push-pull valve core central water passage 1101 is sealed inside the water passages. Therefore, the high-pressure water in the internal water channel of the push-pull switch 1 and the upstream water channel thereof is separated from the downstream water channel by the two sets of first sealing rings 1207, and the flexibility of the high-pressure water in the internal water channel of the push-pull switch 1 and the upstream water channel thereof does not affect the water pressure in the downstream fracturing water channel. If the water pressure in the fracturing water channel is measured at the moment, the influence of high-pressure water flexibility in the upstream water channel can be avoided, and a relatively accurate measurement result can be obtained.

When the push-pull valve core transverse water channel 1102 is communicated with the switching side water channel lower connector 1206, high-pressure water from the high-pressure water source flows through the push-pull valve core transverse water channel 1102 and the switching side water channel lower connector 1206 through the upper connector central water channel 302 and the push-pull valve core central water channel 1101 in sequence and can enter the fracturing water channel again. And high-pressure water can pass through the fracturing section again and is discharged to the outside, and the high-pressure water is injected into a space to be measured outside the fracturing section. Preferably, the inner diameter of the switching side water channel lower joint 1206 is smaller than the inner diameter of the switching side water channel upper joint 1205, so that when the push-pull valve core transverse water channel 1102 is communicated with the switching side water channel lower joint 1206, the water pressure in the fracturing water channel slowly rises, and the precision and the reliability of the measurement result of the whole measurement process can be improved.

In summary, the utility model adds the closed structure of the water channel inside the push-pull valve core by improving the water channel in the push-pull switch, so as to reduce the influence of the flexibility of the water in the whole device on the measuring result; meanwhile, a water channel opening communicated with the fracturing water channel is further added on the push-pull switch, so that the push-pull switch can be communicated with the fracturing water channel through different water channel openings or different connection modes, and high-pressure water is provided for the fracturing water channel in different modes. On the whole, the push-pull switch assembly can reduce errors caused by the flexibility of high-pressure water in a hydraulic fracturing measuring device in the measuring process through a relatively simple structure, can obviously improve the measuring precision, can provide required measuring water pressure in different forms in the fracturing process of the hydraulic fracturing measuring device, and improves the accuracy and the reliability of measuring results.

The foregoing is illustrative of only some embodiments of the invention, and since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all modifications and equivalents may be resorted to, falling within the scope of the invention.

Claims (19)

1. A push-pull switch assembly comprises a push-pull valve core and a push-pull switch, and is characterized in that the push-pull valve core can be tightly matched with the push-pull switch sleeved on the outer side of the push-pull valve core, and the push-pull valve core can move relative to the push-pull switch along the axis direction; a central water channel of the push-pull valve core is arranged in the middle of the interior of the push-pull valve core along the axis direction; through the movement of the push-pull valve core in the push-pull switch, the switching communication between the central water channel of the push-pull valve core and at least two different water channel interfaces arranged on the push-pull switch can be realized;

the push-pull valve core is also provided with at least one push-pull valve core transverse water channel, one end of the push-pull valve core transverse water channel is communicated with the push-pull valve core central water channel, and the other end of the push-pull valve core transverse water channel is communicated with the outer side of the push-pull valve core and is communicated with the outer side of the push-pull valve core; the push-pull valve core transverse water channel is used for realizing switching communication between the push-pull valve core central water channel and at least two different water channel interfaces arranged on the push-pull valve core;

at least two groups of spaced sealing rings are arranged between the push-pull valve core and the push-pull switch, and when the push-pull valve core transverse water channel moves to a position between the at least two groups of spaced sealing rings, the push-pull valve core transverse water channel is sealed by the at least two groups of spaced sealing rings, so that the push-pull valve core central water channel can be sealed and is not communicated with any water channel on the push-pull switch.

2. The push-pull switch assembly as claimed in claim 1, wherein the push-pull switch side wall is formed with an adaptor side water passage having at least one adaptor side water passage port, one end of the adaptor side water passage port communicating with the adaptor side water passage and the other end thereof penetrating through an inner wall of the push-pull switch and being capable of communicating with the push-pull valve element lateral water passage.

3. The push-pull switch assembly as claimed in claim 2, wherein the push-pull switch side wall has two of the transfer side waterway interfaces formed thereon, and the two transfer side waterway interfaces are spaced apart from each other on the push-pull switch side wall; wherein, the interface that is located the upside relatively is switching side water course upper junction, and the interface that is located the downside relatively is switching side water course lower junction.

4. The push-pull switch assembly as recited in claim 3, wherein the transfer-side waterway upper interface is located above the at least two sets of spaced seal rings and the transfer-side waterway lower interface is located below the at least two sets of spaced seal rings.

5. The push-pull switch assembly as claimed in claim 3, wherein an inner diameter of the transfer-side waterway lower interface is smaller than an inner diameter of the transfer-side waterway upper interface.

6. The push-pull switch assembly as claimed in claim 5, wherein the inner diameter of the adaptor-side waterway lower port is sized such that when the push-pull spool lateral waterway is in communication with the adaptor-side waterway lower port, the water pressure in the fracturing waterway in communication with the adaptor-side waterway increases or decreases only in a slowly varying manner.

7. The push-pull switch assembly as claimed in claim 1, wherein a plug is provided at a bottom open position of the push-pull valve core central water passage, the plug being removably attachable to the bottom open position for removably sealing the bottom opening.

8. The push-pull switch assembly of claim 2, wherein the push-pull switch is comprised of a push-pull switch upper portion, a push-pull switch middle portion, and a push-pull switch lower portion; at least one push-pull switch middle side water channel arranged along the axis direction is formed in the side wall of the push-pull switch middle part, and a push-pull switch middle side water channel interface is arranged at the upper end of the push-pull switch middle side water channel so that the push-pull switch middle side water channel can be communicated with the push-pull valve core transverse water channel; at least one switching side water channel is arranged in the side wall of the lower part of the push-pull switch along the axis direction; when the push-pull valve core and the push-pull switch move relatively, the transverse water channel of the push-pull valve core can be communicated with one of the side water channel interface or the switching side water channel interface of the push-pull switch respectively.

9. The push-pull switch assembly as claimed in claim 8, wherein the inner wall of the push-pull switch middle portion further defines at least one laterally disposed drainage channel port, the drainage channel port is connected to a drainage channel and extends through the side wall of the push-pull switch middle portion, the drainage channel port enables the drainage channel to communicate with the push-pull valve core lateral channel, and the other end of the drainage channel extends out of the side wall of the push-pull switch middle portion.

10. The push-pull switch assembly as claimed in claim 9, wherein the drainage channel is located adjacent to an opening in an outer wall of an inner portion of the push-pull switch, and wherein a filter means is provided for preventing sand outside the opening from entering the drainage channel.

11. The push-pull switch assembly as claimed in claim 10 wherein the filter means is an annular structure having at least one bleed opening disposed in a surface thereof, the bleed opening having the filter member disposed therein.

12. The push-pull switch assembly as claimed in claim 9 wherein the push-pull valve core transverse waterway is in communication with one of the push-pull switch side waterway interface, the drainage waterway interface, the transfer side waterway upper interface, or the transfer side waterway lower interface, respectively, during relative movement between the push-pull valve core and the push-pull switch.

13. The push-pull switch assembly as claimed in claim 8, wherein the push-pull switch has a separation beam in a lower portion thereof, the separation beam dividing a chamber in the lower portion of the push-pull switch into upper and lower portions; the upper part of the cavity is used for accommodating the push-pull valve core to slide in the lower part of the push-pull switch; and a groove is formed at the lower part of the cavity and is used for being connected with an upper packer.

14. The push-pull switch assembly as claimed in claim 13, wherein the transfer side water passage is capable of communicating with the interior of the recess.

15. The push-pull switch assembly as claimed in claim 8, wherein at least one push-pull switch lower side waterway is formed in the inner portion of the push-pull switch lower side wall in the axial direction, the push-pull switch lower side waterway being capable of communicating with the push-pull switch lower side waterway.

16. The push-pull switch assembly as claimed in claim 8, wherein the upper push-pull switch portion, the middle push-pull switch portion and the lower push-pull switch portion are removably sealingly connected.

17. The push-pull switch assembly according to any one of claims 2-6, 8-16, wherein the transfer side waterway is in communication with a fracking waterway, the fracking waterway being for hydraulic fracturing.

18. A push-pull switch assembly according to any one of claims 2-16 wherein the push-pull switch lower side water passage communicates with a seat seal water passage for inflating a skin of a packer or die assembly.

19. The push-pull switch assembly of claim 17, wherein the push-pull switch lower side waterway is in communication with a seat seal waterway for inflating a skin of a packer or die assembly.

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