Distributed fracture occurrence measuring device suitable for directional drilling

Abstract

The utility model discloses a distributed crack occurrence measuring device suitable for directional drilling, which is characterized in that a crack occurrence detecting device is arranged at each measuring section in a drilling hole, and the crack occurrence detecting devices between different measuring sections are connected through a drill rod; the crack occurrence detection device comprises an impression device and an eccentric gravity orientation device which are connected in series, and comprises the impression device, a first center through hole and a second center through hole, the eccentric gravity orienting device comprises a base body, a limiting device fixed in the base body and close to one end of the impression device, an orienting eccentric disc rotatably fixed in the base body, a sliding piston limited between the limiting device and the orienting eccentric disc and capable of moving, and a second central through hole of the limiting device, the orienting eccentric disc and the sliding piston; a lateral pressure channel is arranged between the limiting device and the sliding piston, and the lateral pressure channel, the second center through hole and the first center through hole are all communicated. According to the utility model, the time can be greatly saved, the drill lifting risk is reduced, and the efficiency of the directional drilling crack impression test is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of rock mass mechanics test, and specifically relates to a distributed fracture occurrence measuring device suitable for directional drilling. BACKGROUND

[0002] Directional drilling technology has been gradually applied in drilling construction, and in recent years, with the increasing of hole depth and the more complex stratum, in-situ rock mass test in hole faces great risk challenges. As an important content of deep hole in-situ test, hydraulic fracturing method ground stress test mainly includes two steps: firstly, rock mass hydraulic fracturing test is carried out to form a fracturing crack on the wall of the measuring section, and the process can obtain stress value parameters; secondly, the fracturing crack occurrence of all measuring sections is tested by impression, and the occurrence of the corresponding crack plane can be obtained according to the crack traces left on the impression rubber tube combined with the directional device, and the stress direction of the measuring point is further obtained. Hydraulic fracturing test can complete the whole hole measurement at one time, but the crack occurrence impression test can only obtain the data of one measuring section at one time, so long-time and high-frequency tripping is needed to complete the whole test.

[0003] In view of the hole forming characteristics of directional drilling, the drilling inclination angle is generally small or nearly horizontal, and the crack occurrence impression test is more difficult. On the one hand, the horizontal drilling in complex stratum is more prone to hole collapse and block under the weight, and high-frequency tripping will increase the risk of impression test equipment being stuck; on the other hand, the impression rubber tube is easily worn out during the process of taking out the tester from the deep hole, so it is necessary to develop a crack occurrence measuring system suitable for directional drilling, which can reduce the tripping frequency during the impression test of directional drilling and accurately measure the crack direction. UTILITY MODEL CONTENT

[0004] The utility model aims at the deficiencies of the prior art, and provides a distributed fracture occurrence measuring device suitable for directional drilling, which can greatly save time, reduce tripping risk and accurately perform impression and orientation on the drilling crack.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A distributed fracture occurrence measuring device suitable for directional drilling is provided with a fracture occurrence detection device at each measuring section in the drilling hole, and the fracture occurrence detection devices between different measuring sections are connected through a drill rod; the fracture occurrence detection device comprises an impression device and an eccentric gravity orientation device connected in series, wherein:

[0007] An impression device for retaining the shape of a crack on the inner wall of a borehole, one end of the impression device being connected to a first section of drill pipe and the other end being connected to an eccentric gravity orientation device, the impression device having a first central through hole, the first central through hole being connected to a high pressure water pump via a high pressure hose;

[0008] An eccentric gravity orientation device, one end of the eccentric gravity orientation device being connected to the impression device and the other end being connected to a second section of drill pipe, the eccentric gravity orientation device comprising a base body having a cavity, a limiting device fixed in the cavity of the base body near the end of the impression device, an orientation eccentric disc rotatably arranged in the cavity near the second section of drill pipe, a positioning piston limited between the limiting device and the orientation eccentric disc and slidable in the base body, and a second central through hole axially penetrating the base body, a lateral pressure channel being arranged between the limiting device and the positioning piston, the first central through hole, the second central through hole and the lateral pressure channel all being connected;

[0009] In an initial state, the positioning piston is located in the cavity near the end of the limiting device, and in operation, the high pressure water pump continuously injects high pressure water into the lateral pressure channel through the high pressure hose, the first central through hole and the second central through hole, the positioning piston is pushed by the high pressure water and moves until it is locked against the orientation eccentric disc, and the angle of the locked orientation eccentric disc is obtained.

[0010] Further, the impression device comprises an impression rubber tube, blocking joints sleeved on both ends of the impression rubber tube, and a wear-resistant strip ring layer sleeved on the blocking joints, wherein the blocking joint on one end of the impression rubber tube is connected to the first section of drill pipe, the blocking joint on the other end is connected to the eccentric gravity orientation device, and the outer diameter of the wear-resistant strip ring layer is greater than the outer diameter of the impression rubber tube.

[0011] Further, strip ring layers are also sleeved on the outer rings at both ends of the impression rubber tube, and a protection ring is further arranged between the impression rubber tube and the strip ring layers.

[0012] Further, the base body comprises a directional main body assembly and a protection assembly butting against the main body assembly, the directional main body assembly and the protection assembly butting against each other form the cavity accommodating the positioning piston, the central tube and the orientation eccentric disc in the interior of the protection assembly, and a rear end interface connected to the second section of drill pipe is arranged at the end of the protection assembly.

[0013] Further, the limiting device blocks the end side of the base body near the impression device, a plurality of protrusions are arranged on the end face of the limiting device near the positioning piston, and when the positioning piston slides towards the limiting device and abuts against the protrusions on the limiting device, the lateral pressure channel is formed between the end face of the limiting device and the positioning piston.

[0014] Further, the limiting device comprises a limiting block closed at one end of the cavity of the base body close to the impression device, a plurality of screw holes arranged in parallel to the axial direction of the limiting block and penetrating through the limiting block, and a limiting screw screwed in each screw hole, wherein the length of the limiting screw is greater than the length of the limiting block so that the limiting screw extends out of the limiting block to form a plurality of protrusions on the end face of the limiting block facing the sliding piston.

[0015] Further, a T-shaped fixing block is closed at one end of the positioning body kit away from the impression device, a plurality of sliding holes are arranged in parallel to the axial direction of the fixing block and penetrating through the fixing block, a positioning piston is slidingly arranged in each sliding hole, and a first step surface matched with the shape of the fixing block and closed is arranged at one end of the positioning body kit away from the limiting block, and correspondingly, a second step surface matched with the first step surface is arranged on the outer wall of the positioning piston, so that the positioning piston is limited and cannot be pulled out of the base body.

[0016] Further, the positioning piston comprises a hollow piston base body, a limiting screw fixed in the piston base body, a spring connected with the limiting screw, a top rod connected with the spring and extending out of the piston base body, a disc fixed on the top rod, and a positioning needle arranged on the disc, when high-pressure water is continuously injected into the lateral pressure channel, the high-pressure water pushes the positioning piston to move towards the directional eccentric disc until the positioning needle pierces into the positioning eccentric disc to lock the directional eccentric disc.

[0017] Further, the positioning piston further comprises a limiting snap ring, and correspondingly, a limiting snap groove is arranged on the outer wall of the piston base body, when the positioning needle pierces into the positioning eccentric disc to lock the directional eccentric disc, the limiting snap ring is just snapped into the limiting snap groove.

[0018] Further, the directional eccentric disc comprises a disc, a positioning eccentric disc fixed on the disc and arranged correspondingly with the positioning needle, an eccentric lead block embedded and fixed on the edge of the disc, the disc is sleeved on the central pipe through a bearing, the central pipe is fixed in the axial direction of the base body, a scale and a pointing arrow facilitating reading the scale are arranged on the disc surface.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] (1) The utility model can complete the crack occurrence impression test of the whole hole selected section by one time of drilling, can effectively reduce the test time and reduce the test risk, through the eccentric gravity directional device, the positioning piston is pushed to move by water pressure to lock the eccentric positioning disc, the corresponding relationship between the scale on the disc and the trace direction of the impression rubber cylinder can be accurately measured, the locking is firm and easy to disassemble, the operation is convenient and the measurement is accurate, in addition, the eccentric gravity directional device not only has the simple and reliable fracturing crack directional function, but also provides a new idea for the modular impression test through the design of the central pressure channel;

[0021] (2)The utility model discloses the equipment connection, delivery and the purpose of maintaining the stability of the drilling of the help of the rope core drill rod, need not additional increase other equipment, can reduce the cost, and the self-protection mould device can effectively protect the crack mark on the rubber tube. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the schematic diagram of the fracture occurrence measuring device of the directional drilling of the utility model embodiment;

[0023] Figure 2 It is the longitudinal section structure schematic diagram of the mould device of the utility model embodiment;

[0024] Figure 3 It is the longitudinal section structure schematic diagram of the eccentric gravity type directional device of the utility model embodiment;

[0025] Figure 4 It is the longitudinal section structure schematic diagram of the sliding piston of the utility model embodiment;

[0026] Figure 5 It is the structure schematic diagram of the longitudinal section of the mould directional device, (a) A-A', (b) B-B', (c) C-C';

[0027] Figure 6 It is the longitudinal section structure schematic diagram of the eccentric gravity directional device after locking of the utility model embodiment;

[0028] Figure 7 It is the longitudinal section structure schematic diagram of the eccentric gravity directional device after locking in the tail end of the drilling of the utility model embodiment. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0030] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0031] The utility model will be further described below in conjunction with specific embodiments, but not as the limitation of the utility model.

[0032] This utility model discloses a distributed fracture orientation measurement device suitable for directional drilling. A fracture orientation detection device is installed in each measurement section within the borehole, and the fracture orientation detection devices between different measurement sections are connected via drill rods 5. The fracture orientation detection device includes a modeling device 4 and an eccentric gravity orientation device 3 connected in series. See [link to relevant documentation]. Figure 2 The impression device 4 includes a central perforated tube 4-1, an impression tube 4-6 fitted onto the central perforated tube 4-1, and sealing connectors 4-2 fitted onto both ends of the impression tube 4-6. One end of the sealing connector 4-2 is connected to the first drill rod, and the other end is connected to the eccentric gravity orientation device 3. To prevent friction between the impression tube 4-6 and the drill hole 1 from affecting the crack marks on the impression tube, highly wear-resistant strip rings 4-3 are welded onto the sealing connectors 4-2 and the protective steel rings 4-4 at both ends of the impression tube 4-6. Furthermore, a protective ring 4-4 ​​is provided between the impression tube 4-6 and the strip ring 4-3 to protect the impression tube 4-6. Additionally, multiple water outlets 4-5 are provided on the central perforated tube 4-1, allowing high-pressure water to flow from these outlets 4-5 into the cavity between the impression tube 4-6 and the central perforated tube 4-1. The center tube 4-1 can form a first central through hole. One end of the center tube 4-1 is connected to the high-pressure water pump 10 through a high-pressure hose 6. In order to facilitate the monitoring of the water pressure of the high-pressure water pump, the high-pressure hose 6 and the high-pressure water pump 10 are connected through a ground high-pressure pipe 9. A pressure gauge 7 and a pressure relief valve 8 are installed on the ground high-pressure pipe 9.

[0033] See Figure 3 The eccentric gravity orientation device 3 includes a base with a cavity, a limiting device fixed in the cavity near one end of the impression device 4, an orientation eccentric disk rotatably disposed in the cavity near one end of the second drill rod, a positioning piston 3-7 restricted between the limiting device and the orientation eccentric disk and slidable in the cavity, and a second central through hole 3-16 penetrating the axial direction of the base. The base includes a hollow positioning main body kit 3-3 and a hollow protective kit 3-14 that fits into the positioning main body kit 3-3. After the positioning main body kit 3-3 and the protective kit 3-14 are fitted together, they form the aforementioned cavity for accommodating the limiting device, the sliding piston 3-7, and the directional eccentric disk. The end of the positioning main body kit 3-3 is provided with a front end connector 3-1 that connects to the sealing connector 4-2 on the impression tube 4-6. The end of the protective kit 3-14 is provided with a rear end interface 3-15 that connects to the second section of the drill rod. For the eccentric gravity orientation device 3 located at the very end of the borehole, its end is sealed with a cap 3-17 (see...). Figure 7 ).

[0034] In the present embodiment, the limiting device is fixed in the directional main body set 3-3 near the one end of the impression device 4. The limiting device comprises a limiting block 3-5 blocked in the cavity near the one end of the impression device 4, a plurality of screw holes arranged in parallel to the axial direction of the limiting block 3-5 and penetrating through the limiting block 3-5, and limiting screws 3-4 screwed in each of the screw holes, wherein the length of the limiting screws 3-4 in the directional main body set 3-3 is greater than the length of the limiting block 3-5 so that a plurality of protrusions are formed on the end surface of the limiting block 3-5 facing the sliding piston 3-7, thereby ensuring that there is enough space between the positioning piston 3-7 and the end surface of the limiting screw 3-4 to form a lateral pressure channel even when the positioning piston 3-7 moves to the limit position near the limiting device, and ensuring that the high-pressure water flow entering from the lateral pressure channel 3-6 can easily push the positioning piston 3-7. A front end connector 3-2 is connected to the limiting block 3-5, and both the front end connector 3-2 and the limiting block 3-5 have an axial hole, and the axial holes of the two are communicated.

[0035] A T-shaped fixing block 3-18 is blocked at the one end of the directional main body set away from the impression device 4. A plurality of sliding holes are arranged in parallel to the axial direction of the fixing block 3-18 and penetrating through the fixing block 3-18, and a positioning piston 3-7 is slidingly arranged in each of the sliding holes, and the positioning piston 3-7 can move in the sliding hole of the fixing block 3-18. In order to prevent the positioning piston 3-7 from moving out of the base body and damaging the directional eccentric disc during movement, a first step surface is arranged at the one end of the directional main body set 3-3 near the directional eccentric disc, which cooperates with and is closed by the fixing block 3-18, and the outer surface of the positioning piston 3-7 is also provided with a second step surface cooperating with the first step surface, so that the positioning piston 3-7 is limited and thus does not come off the base body 3-3.

[0036] As shown in Figure 4 The positioning piston 3-7 comprises a hollow piston base body 3-7.1, a limiting screw 3-7.2 fixed in the piston base body 3-7.1, a spring 3-7.4 connected with the limiting screw 3-7.2, a top rod 3-7.6 connected with the spring 3-7.4 and extending out of the piston base body 3-7.1, a fixing disc 3-7.7 fixed on the top rod 3-7.6, and a positioning pin 3-7.8 arranged on the fixing disc 3-7.7. Among them, the fixing disc 3-7.7 is made of rubber material, and the spring 3-7.4 and the fixing disc 3-7.7 both have a buffering effect to prevent rigid impact from damaging the directional eccentric disc. In order to prevent high-pressure water from leaking along the edge of the positioning piston 3-7 into the space where the directional eccentric disc is located, thereby affecting the movement of the positioning piston 3-7, a plurality of sealing rings 3-7.3 are sleeved on the outer surface of the piston base body 3-7.1. When high-pressure water is continuously injected into the lateral pressure channel 3-6, the high-pressure water pushes the positioning piston 3-7 to move towards the directional eccentric disc until the positioning pin 3-7.8 pierces the directional eccentric disc to lock it.

[0037] SeeFigure 5 The directional eccentric disc includes a disc 3-10, a positioning glue disc 3-9 fixed on the disc 3-10 and corresponding to the positioning nails 3-7.8, and an eccentric lead block 3-13 embedded and fixed on the edge of the disc 3-10. The disc 3-10 is sleeved on the central pipe 3-12 through a bearing 3-11, wherein the shaft hole of the front end joint 3-2, the limiting block 3-5, the fixed block 3-18, and the central pipe 3-12 are connected to form a second central through hole 3-16 of the eccentric gravity directional device 3, which is communicated with the first central through hole 4-1 and the high-pressure hose 6. In addition, a limiting snap ring 3-8 is sleeved on the central pipe 3-12, and a limiting snap groove 3-7.5 is correspondingly arranged on the piston base 3-7.1, which is arranged to be just snapped into the limiting snap groove 3-7.5 when the positioning eccentric disc is locked by the positioning nails 3-7.8 penetrating into the positioning glue disc 3-9. In order to read the angle of the crack, a scale and a pointing arrow for reading the scale are drawn on the disc surface of the disc 3-10, the pointing arrow points to the center of gravity of the eccentric lead block 3-13 to ensure that the directional eccentric disc is affected by the eccentric gravity, and the disc surface arrow always points to the directly below of the drilling cross section.

[0038] The crack occurrence measuring method using the distributed crack occurrence measuring device suitable for directional drilling has the following steps:

[0039] Firstly, the selected section of the impression and the corresponding depth of each measuring section are determined, and the crack occurrence detection device and the drill pipe length of each section are matched in advance. Each crack occurrence detection device of each measuring section includes a self-protection impression device 4( Figure 2 ) and an eccentric gravity directional device 3. The rear end interface of the tail end eccentric gravity directional device 3 is closed, as shown in Figure 7 , and the eccentric gravity directional device 3 of the middle part is shown in Figure 3 .

[0040] Secondly, the pressure bearing capacity of the wireline coring drill pipe 5 is tested. If the pressure bearing capacity of the wireline coring drill pipe 5 exceeds the maximum tensile pressure of the cracks of each measuring section, the wireline coring drill pipe 5 can be used as a pressure channel, and the high-pressure hose 6 does not need to be connected inside the drill pipe, which can effectively reduce the workload of pipe installation. If the pressure bearing capacity of the wireline coring drill pipe 5 is less than the maximum tensile pressure of the cracks of each measuring section, the high-pressure hose 6 needs to be connected inside the drill pipe to form an independent water pressure channel, as shown in Figure 1 , which is suitable for super deep directional drilling. The following are subsequent steps of this scheme.

[0041] Third step, according to the depth of each section in turn through the drill pipe connecting each section of fracture occurrence detection device and rely on the drilling into the directional drilling 1, super deep directional drilling need to connect high pressure hose 6, until all the mold device 4 and its test depth one by one corresponding, at this time the first center hole of all mold device 4 in the hole and the second center hole 3-16 of eccentric gravity orientation device 3 are connected by high pressure hose 6, as shown in Figure 1 ;

[0042] Fourth step, outside the hole will be connected with high pressure water pump 10, ground high pressure pipe 9, pressure gauge 7, pressure relief valve 8, and the ground high pressure pipe 9 and the high pressure hose 6 in the hole are connected, complete the preparation work, at this time the disc 3-10 under the action of eccentric lead block 3-13 gravity arrow keeps pointing down, the positioning piston 3-7 is in the initial position (i.e. in contact with the limit screw 3-4), as shown in Figure 3 , Figure 4 and Figure 5 ;

[0043] Fifth step, through the high pressure water pump 10 to the high pressure hose 6 into the water pressure, a small amount of pressure water in the process of pressure into the cavity between the mold rubber cylinder 4-6 and the center tube 4-1 through the center tube of the mold device 4 water outlet hole 4-5, make the mold rubber cylinder 4-6 expand and stick to the hole wall, the rest of the pressure water through the second center hole 3-16 of eccentric gravity orientation device 3 into the lateral pressure channel 3-6 and push the positioning piston 3-7 to move towards the eccentric positioning disc, continue to inject water, the positioning pin 3-7.8 on the piston stick to and pierce into the positioning rubber disc 3-9, and then lock the directional eccentric disc, the spring 3-7.4 in the piston base 3-7.1, the fixed disc 3-7.7 (made of rubber material), the positioning rubber disc 3-9 all play a buffering role, prevent rigid impact damage disc 3-10; limit the ring 3-8 in the positioning piston 3-7 after the maximum stroke into its limit groove 3-7.5, limit the movement of the positioning piston 3-7, ensure the locking state of the disc 3-10, as shown in Figure 6 and Figure 7 , continue to pressurize to the maximum re tension pressure and keep the pressure for a period of time, to ensure that the mold rubber cylinder 4-6 open and stick to the hole wall fracture, so that the mold rubber cylinder can leave the clear trace of the hole wall fracture;

[0044] Sixth step, through the drilling machine to pull out the fracture occurrence detection device in the hole, the hard alloy strip 4-3 attached to the self protection mold device 4 can prevent the mold rubber cylinder 4-6 from direct friction contact with the drill hole 1, to protect the fracture mark on the mold rubber cylinder 4-6; synchronous removal of the rope core drill pipe 5 and high pressure hose 6, each section of the mold device 4 and the corresponding eccentric gravity orientation device 3 need to keep the test connection state, according to the requirements of all test section test device in the hole are taken out in turn;

[0045] Seventh, after the removal of each section of the mold orientation device and eccentric gravity orientation device 3 second set 3-14, 3-10, the scale of the corresponding relationship between the rubber layer on the impression rubber 4 remaining crack traces and disc mark observed and recorded, the fracture occurrence;

[0046] Eighth, after the test to restore the piston limit ring 3-8 and the positioning piston 3-7 to the initial state, good equipment maintenance.

[0047] The utility model discloses can greatly save time, reduce the risk of bailing out, and then produce obvious economic benefits, improve the efficiency of directional drilling fracture mold test, reduce the test cost, and the method is simple, and the equipment requirement is lower, and it is convenient for large-scale popularization and application.

[0048] The above is only the preferred embodiment of the utility model, and does not limit the implementation and protection scope of the utility model, and for those skilled in the art, it should be realized that the equivalent replacement and obvious changes obtained from the application of the utility model specification content, all should be contained in the protection scope of the application.

Claims

1. A distributed fracture-orientation-measuring device suitable for directional drilling, characterized by, The application discloses a fracture occurrence detection device for a borehole. The fracture occurrence detection device comprises an impression device and an eccentric gravity orientation device which are connected in series. The impression device is used for retaining the shape of a fracture on the inner wall of the borehole. The impression device is connected with the first drill pipe at one end and connected with the eccentric gravity orientation device at the other end.

2. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 1, wherein, The impression device has a first central through hole which is connected with a high-pressure water pump through a high-pressure hose.

3. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 1, wherein, The eccentric gravity orientation device is connected with the impression device at one end and connected with the second drill pipe at the other end.

4. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 1, wherein, The eccentric gravity orientation device comprises a base body having a cavity, a limiting device fixed in the cavity of the base body near the end of the impression device, a directional eccentric disc rotatably arranged in the cavity near the second drill pipe, a positioning piston limited between the limiting device and the directional eccentric disc and slidable in the base body, and a second central through hole axially penetrating the base body.

5. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 1, wherein, A lateral pressure channel is arranged between the limiting device and the positioning piston.

6. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 5, wherein, The first central through hole, the second central through hole and the lateral pressure channel are all communicated. In the initial state, the positioning piston is located at the end of the cavity near the limiting device. During operation, the high-pressure water pump continuously injects high-pressure water into the lateral pressure channel through the high-pressure hose, the first central through hole and the second central through hole. The positioning piston is pushed by the high-pressure water and moves until it is locked against the directional eccentric disc and locks the angle of the directional eccentric disc. The impression device comprises an impression rubber tube, blocking joints sleeved at both ends of the impression rubber tube and wear-resistant strip ring layers sleeved on the blocking joints. One end of the impression rubber tube is connected with the first drill pipe, and the other end is connected with the eccentric gravity orientation device. The outer diameter of the wear-resistant strip ring layers is larger than the outer diameter of the impression rubber tube. The strip ring layers are also sleeved on the outer rings at both ends of the impression rubber tube. Protection rings are arranged between the impression rubber tube and the strip ring layers. The base body comprises a directional main body assembly and a protection assembly which is butted with the main body assembly. The directional main body assembly and the protection assembly form the cavity accommodating the positioning piston, the central tube and the directional eccentric disc in the interior after being butted. The protection assembly is provided with a rear end interface connected with the second drill pipe at the end. The limiting device is blocked at the end side of the base body near the impression device. A plurality of protrusions are arranged on the end face of the limiting device near the positioning piston. When the positioning piston slides towards the limiting device and is pressed against the protrusions on the limiting device, the lateral pressure channel is formed between the positioning piston and the end face of the limiting device. The limiting device comprises a limiting block blocked at the end of the base body near the impression device, a plurality of screw holes arranged on the limiting block in parallel with the axial direction of the limiting block, and limiting screws screwed in each screw hole. The length of the limiting screws is larger than the length of the limiting block so that the limiting screws extend out of the limiting block to form a plurality of protrusions on the end face of the limiting block towards the sliding piston.

7. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 4, wherein, A T-shaped fixing block is arranged at the end of the positioning body assembly away from the impression device, a plurality of sliding holes parallel to the axial direction of the fixing block are arranged through the fixing block, a positioning piston is arranged in each sliding hole in a sliding manner, and a first step surface that cooperates with the shape of the fixing block and is closed is arranged at the end of the positioning body assembly away from the fixing block. Correspondingly, a second step surface that cooperates with the first step surface is arranged on the outer wall of the positioning piston, so that the positioning piston is limited and cannot be taken out of the base body.

8. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 1, wherein, The positioning piston comprises a hollow piston base body, a limiting screw fixed in the piston base body, a spring connected with the limiting screw, a top rod connected with the spring and extending out of the piston base body, a disc fixed on the top rod, and a positioning needle arranged on the disc. When high-pressure water is continuously injected into the lateral pressure channel, the high-pressure water pushes the positioning piston to move towards the directional eccentric disc until the positioning needle pierces into the directional eccentric disc to lock the directional eccentric disc.

9. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 8, wherein, The positioning piston further comprises a limiting snap ring, and a limiting snap groove is arranged on the outer wall of the piston base body. When the positioning needle pierces into the directional eccentric disc to lock the directional eccentric disc, the limiting snap ring is just snapped into the limiting snap groove.

10. The distributed fracture-attitude-measuring device suitable for directional drilling of claim 8, wherein, The directional eccentric disc comprises a disc, a directional eccentric disc fixed on the disc and corresponding to the positioning needle, an eccentric lead block embedded and fixed on the edge of the disc, the disc is sleeved on the central pipe through a bearing, the central pipe is fixed on the axial direction of the base body, a scale and a pointing arrow for conveniently reading the scale are arranged on the disc surface.

Images