An inner ball-throwing type deflector for oil drilling and its use method

Abstract

The present invention relates to the technical field of oil drilling, and specifically to an internal ball-dropping deflector for oil drilling and a method of using the same, wherein the internal ball-dropping deflector for oil drilling comprises a deflector body, the bottom of the deflector body is connected to an anchoring pipe column, the bottom of the anchoring pipe column is connected to a sealing pipe column, and the bottom of the sealing pipe column is connected to a liquid injection joint or a packer. The present invention integrates the sealing ball into the sealing pipe column, so that the wireless gyroscope and the sealing ball can be lowered into the well along with the entire pipe column, thereby simplifying the working steps and improving the working efficiency. In addition, the working time and working cost are reduced by avoiding the tedious lowering and lifting process of the wired gyroscope.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling, and in particular to an inner ball-throwing type deflector for oil drilling and a use method thereof. Background Art

[0002] When the casing in the oil layer downhole is severely damaged or the oil layer collapses and is buried by sand, and the oil well can no longer be produced, in order to utilize the upper casing to reduce the cost of re-drilling, "window" side drilling can be performed in the casing above the oil layer to form a new wellbore for oil production.

[0003] Casing drilling is an important means of re-drilling a well with severely damaged lower casing to restore the production capacity of the well by using the upper casing. The main window-opening tool used is the whipstock, also known as the whipstock, whipstock, etc.

[0004] When in use, the wired gyroscope needs to be lowered into the well through the armored cable to measure the orientation, and then the wired gyroscope is lifted out of the wellhead through the armored cable to make the entire pipe column inner cavity conductive up and down, and then the sealing ball seat can be put into the well for sealing, and finally the pressure anchoring operation can be carried out. The whole process is very cumbersome. Due to the complex underground operating environment of the collapse, it is difficult to lower and lift the wired gyroscope through the armored cable soft connection, which makes the operation time long and the operation cost high. Summary of the invention

[0005] The purpose of the present invention is to address the defects of the prior art and to provide an internal ball-dropping inclination guide for oil drilling and a method of use. The sealing ball is designed to be built into the sealing pipe string, so that the wireless gyroscope and the sealing ball can be lowered into the well along with the entire pipe string, thereby simplifying the working steps and improving the working efficiency. By avoiding the tedious lowering and lifting procedures of the wired gyroscope, the operating time and operating costs are reduced.

[0006] The technical solution of the present invention is: an inner ball type deflector for oil drilling, comprising a deflector body, the bottom of which is connected to an anchoring pipe column, and the bottom of which is connected to a sealing pipe column;

[0007] The sealing column comprises an outer cylinder, the inner cavity of which is divided into a small diameter cavity and a large diameter cavity which are connected to each other from top to bottom, and a sealing ball, an elastic ball holder, a piston tube and a support sleeve are arranged in the cavity of the outer cylinder from top to bottom, the upper part of the elastic ball holder is located in the small diameter cavity, and the lower part is located in the large diameter cavity;

[0008] The top of the piston tube is connected to the elastic ball holder and the inner cavity is connected. The outside of the piston tube is provided with a first outer step portion which is slidably and sealedly connected to the large diameter cavity. A guide hole is provided on the wall of the piston tube at a position above the first outer step portion. A spring is sleeved on the outside of the piston tube. The two ends of the spring respectively support the first outer step portion and the support sleeve. The support sleeve is fixedly connected to the cavity of the outer cylinder body. The bottom of the piston tube penetrates into the support sleeve.

[0009] The bottom of the outer cylinder is connected with a liquid injection joint or a packer, and a sealing part adapted to the sealing ball is arranged in the cavity of the liquid injection joint or the cavity of the packer.

[0010] Preferably, the liquid injection joint is provided with a group of liquid outlet holes connecting the inner cavity with the outside.

[0011] Preferably, the packer comprises a central tube fixedly connected to the bottom of the outer cylinder, a plug is connected to the bottom of the central tube, and a vertically opened guide groove is provided on the wall of the central tube;

[0012] The outer wall of the central tube is provided with a sliding ring and a rubber tube, the inner cavity of the central tube is slidably connected with a piston tube, the top of the piston tube extends into the bottom cavity of the outer cylinder body, and the top of the piston tube is provided with a second outer step portion which is slidably and sealingly connected with the inner cavity of the outer cylinder body, the inner top of the central tube is provided with a thrust ring, and the inner wall of the thrust ring and the outer wall of the piston tube are provided with mutually matching one-way tooth grooves;

[0013] The middle of the piston cylinder is provided with a liquid injection hole connected with the guide groove, and the bottom of the piston cylinder is provided with a radially arranged guide key, and the end of the guide key passes through the guide groove and presses on the top of the slip ring.

[0014] Preferably, the deflector body includes a deflection guide tube and a lifting tube inserted into the deflection guide tube, the outer wall of the lifting tube is slidably sleeved with a straightening ring, the straightening ring is connected to the deflection guide tube through shear nails, and the outer wall of the lifting tube is provided with a lifting block that cooperates with the straightening ring.

[0015] Preferably, the anchoring pipe column comprises an assembly tube, and a connecting pipe for connecting with the deflector body is provided on the top of the assembly tube;

[0016] A driving tube is arranged in the assembly tube, an annular pressure-bearing cavity is formed between the driving tube and the assembly tube, and a pressure transmission hole is arranged on the tube wall of the driving tube to connect the inner cavity of the driving tube with the pressure-bearing cavity;

[0017] The top of the driving tube is connected to an upper cone connected to the inner cavity, the bottom of the upper cone is slidably and sealedly connected to the inner wall of the assembly tube, the upper part of the driving tube is radially slidably connected to a group of upper slips matched with the upper cone, and the upper slips are connected to the upper cone by shear nails;

[0018] The lower part of the driving tube is sleeved with a lower cone, and the inner wall of the lower cone and the outer wall of the driving tube are provided with mutually matching one-way tooth grooves, the top of the lower cone is slidably and sealedly connected with the inner wall of the assembly tube, and the lower part of the assembly tube is radially slidably connected with a group of lower slips matching with the lower cone, and the lower slips are connected to the lower cone by shear nails;

[0019] The bottom of the assembly cylinder is connected to a connecting sleeve connected to the inner cavity, and a coaxially arranged inner pipe is slidably and sealably connected inside the connecting sleeve. The top of the inner pipe is connected to the bottom of the lower cone and is connected to the inner cavity.

[0020] Preferably, an annular space gap is provided between the piston cylinder and the outer cylinder body, and a pressure relief hole for connecting the outside with the annular space gap is provided on the outer cylinder body.

[0021] A method for using an inner ball-throwing deflector for oil well drilling, comprising the above-mentioned inner ball-throwing deflector for oil well drilling, the method for using comprising the following steps:

[0022] First, the deflector body, anchoring string and sealing string are connected in sequence. The deflector body is connected to the wireless gyroscope and the working string upwards, and the sealing string is connected to the injection joint or the packer downwards. Then, the working string is lowered to the working position in the well.

[0023] Next, in the small displacement working mode, mud is pumped into the well through the mud pump. The mud enters the sealing and pressure pipe string through the inner cavity of the deflector body and the inner cavity of the anchor pipe string, and then enters the injection joint or the packer through the small diameter cavity, the large diameter cavity, the diversion hole, the piston tube and the support sleeve, and then enters the well through the injection joint or the packer. The mud circulates normally. At this time, the wireless gyroscope is used to determine the casing window orientation.

[0024] Next, in the large-displacement working mode, after the wireless gyro orientation is completed, the displacement of the mud pump is increased, and the mud pushes the sealing ball and the elastic ball holder downward. After the elastic ball holder falls into the large-diameter cavity as a whole, the sealing ball enters the elastic ball holder and causes the supporting petals of the elastic ball holder to open outward;

[0025] Then the sealing ball is seated on the sealing part of the injection joint or the packer through the elastic ball holder, the piston tube and the support sleeve, and blocks the internal flow channel;

[0026] Next, the sealing ball blocks the downward flow channel, causing the pressure inside the pipe string to increase. As the pressure increases, the anchor pipe string is tightened and anchored on the inner wall of the casing in the well.

[0027] Finally, the deflector is separated, and the working string is lifted up to lift the gyroscope out of the wellhead, while the anchor string and the sealing string remain in the well.

[0028] Preferably, when the bottom of the anchoring string is connected to the packer, after the sealing ball seat seals the internal flow channel of the packer, the internal pressure of the entire string increases, and while the anchoring string is tightened and anchored, the packer is also tightened and sealed in the casing.

[0029] Compared with the prior art, the present invention has the following advantages: the present invention designs the sealing ball to be built inside the sealing pipe string, so that the wireless gyroscope and the sealing ball can be lowered into the well together with the whole pipe string;

[0030] This replaces the tedious operation of traditional pipe operation, which requires first lifting the wired gyroscope out of the wellhead through the armored cable to make the entire internal space of the pipe string conductive before lowering the sealing ball seat seal, thereby simplifying the work steps and improving work efficiency.

[0031] In addition, the invention can be adapted to the currently popular wireless gyroscopes to replace the obsolete wired gyroscopes, thereby avoiding the cumbersome lowering and lifting procedures of the wired gyroscopes and reducing operation time and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 A schematic diagram of the structure of assembling a liquid injection joint for a sealed and compressed pipe column;

[0034] Figure 3 A schematic diagram of the structure of assembling a packer for a sealing and pressure pipe string;

[0035] Figure 4 It is a structural schematic diagram of the deflector body;

[0036] Figure 5 is a schematic diagram of the structure of the anchoring string;

[0037] In the figure: 1, the deflector body, 2, the anchoring string, 3, the sealing string;

[0038] 101, lifting and lowering pipe, 102, straightening ring, 103, guide pipe, 104, lifting stopper;

[0039] 201, connecting pipe, 202, assembly cylinder, 203, pressure transmission hole, 204, upper slip, 205, upper cone, 206, driving pipe, 207, lower cone, 208, pressure chamber, 209, lower slip, 210, connecting sleeve, 211, inner pipe;

[0040] 301. outer cylinder body, 302. elastic ball holder, 303. guide hole, 304. spring, 305. piston tube, 306. support sleeve, 307. injection joint, 308. sealing ball, 309. small diameter cavity, 310. large diameter cavity, 311. first outer step, 312. sealing part, 313. liquid outlet, 314. packer, 315. piston cylinder, 316. center tube, 317. guide key, 318. sliding ring, 319. guide groove, 320. rubber cylinder, 321. plug, 322. annular space, 323. pressure relief hole, 324. injection hole, 325. second outer step, 326. thrust ring. DETAILED DESCRIPTION

[0041] The present invention is further described below with reference to the accompanying drawings and embodiments. Example 1

[0042] like Figure 1 A ball-dropping type deflector for oil drilling comprises a deflector body 1, an anchoring pipe column 2 is connected to the bottom of the deflector body 1, and a sealing pipe column 3 is connected to the bottom of the anchoring pipe column 2.

[0043] like Figure 2 and Figure 3 The sealing column 3 includes an outer cylinder 301, and the inner cavity of the outer cylinder 301 is divided into a small diameter cavity 309 and a large diameter cavity 310 which are connected to each other from top to bottom.

[0044] The cavity of the outer cylinder 301 is provided with a sealing ball 308 , an elastic ball holder 302 , a piston tube 305 and a support sleeve 306 in sequence from top to bottom. The upper part of the elastic ball holder 302 is located in the small diameter cavity 309 , and the lower part is located in the large diameter cavity 310 .

[0045] A ball cover may be installed on the upper portion of the inner cavity of the outer cylinder 301 to seal the sealing ball 308 to prevent the sealing ball 308 from jumping upward.

[0046] The top of the piston tube 305 is connected to the elastic ball holder 302 , and the piston tube 305 is communicated with the inner cavity of the elastic ball holder 302 .

[0047] The piston tube 305 has a first outer step portion 311 on its exterior that is slidably and sealingly connected to the large diameter cavity 310 . A flow guide hole 303 is provided on the wall of the piston tube 305 above the first outer step portion 311 .

[0048] A spring 304 is sleeved on the outside of the piston tube 305 , and two ends of the spring 304 support the first outer step portion 311 and the support sleeve 306 respectively.

[0049] The support sleeve 306 is fixedly connected to the cavity of the outer cylinder 301 , and the bottom of the piston tube 305 penetrates into the support sleeve 306 , and a movable gap is left between the piston tube 305 and the support sleeve 306 .

[0050] The bottom of the outer cylinder 301 is connected to a liquid injection joint 307 or a packer 314 , and a sealing portion 312 adapted to the sealing ball 308 is provided in the cavity of the liquid injection joint 307 or the cavity of the packer 314 . Example 2

[0051] This embodiment optimizes the structure of the optional injection joint 307 and the packer 314 on the basis of the above embodiment, specifically:

[0052] The liquid injection joint 307 is provided with a group of liquid outlet holes 313 for connecting the inner cavity with the outside.

[0053] The packer 314 includes a central tube 316 fixedly connected to the bottom of the outer cylinder 301 , a plug 321 is connected to the bottom of the central tube 316 , and a vertically opened guide groove 319 is provided on the tube wall of the central tube 316 .

[0054] A sliding ring 318 and a rubber sleeve 320 are mounted on the outer wall of the center tube 316, and a piston cylinder 315 is slidably connected to the cavity of the center tube 316. The top of the piston cylinder 315 extends into the bottom cavity of the outer cylinder body 301, and the top of the piston cylinder 315 is provided with a second outer step portion 325 that is slidably and sealingly connected to the inner cavity of the outer cylinder body 301. A thrust ring 326 is provided at the top of the cavity of the center tube 316, and the inner wall of the thrust ring 326 and the outer wall of the piston cylinder 315 are provided with mutually matching one-way grooves. When the piston cylinder 315 moves downward, the one-way grooves that cooperate with the thrust ring 326 are continuously meshed, which plays a one-way fixing role on the position of the piston cylinder 315 and prevents the piston cylinder 315 from retreating upward.

[0055] An annular gap 322 is provided between the piston cylinder 315 and the outer cylinder body 301 , and a pressure relief hole 323 is provided on the outer cylinder body 301 for connecting the annular gap 322 with the outside.

[0056] A liquid injection hole 324 connected to the guide groove 319 is provided in the middle of the piston cylinder 315, and a radially arranged guide key 317 is provided at the bottom of the piston cylinder 315. The end of the guide key 317 passes through the guide groove 319 and presses on the top of the slip ring 318. Example 3

[0057] This embodiment optimizes the structure of the deflector body 1 on the basis of the above embodiment, specifically:

[0058] like Figure 4 The deflector body 1 includes a deflection guide tube 103 and a lifting tube 101 inserted into the deflection guide tube 103. The outer wall of the lifting tube 101 is slidably sleeved with a stabilizing ring 102. The stabilizing ring 102 is connected to the deflection guide tube 103 through shear nails. A lifting block 104 cooperating with the stabilizing ring 102 is provided on the outer wall of the lifting tube 101. Example 4

[0059] This embodiment optimizes the structure of the anchoring column 2 on the basis of the above embodiment, specifically:

[0060] like Figure 5 The anchoring pipe column 2 includes an assembly tube 202 , and a connecting pipe 201 for connecting with the deflector body 1 is provided at the top of the assembly tube 202 .

[0061] A driving tube 206 is disposed in the assembly tube 202 , and an annular pressure-bearing chamber 208 is formed between the driving tube 206 and the assembly tube 202 . A pressure transmission hole 203 is disposed on the tube wall of the driving tube 206 , which connects the inner cavity of the driving tube 206 with the pressure-bearing chamber 208 .

[0062] The top of the driving tube 206 is connected to an upper cone 205 which is connected to the inner cavity. The bottom of the upper cone 205 is slidingly and sealingly connected to the inner wall of the assembly tube 202. The upper part of the driving tube 206 is radially slidingly connected to a group of upper slips 204 which cooperate with the upper cone 205. The upper slips 204 and the upper cone 205 are connected by shear nails.

[0063] The lower part of the driving tube 206 is provided with a lower cone 207, and the inner wall of the lower cone 207 and the outer wall of the driving tube 206 are provided with mutually matching one-way grooves. When the lower cone 207 moves downward along the driving tube 206, the mutually matching one-way grooves are continuously engaged, which plays a one-way limiting role on the lower cone 207 and prevents the lower cone 207 from retreating upward.

[0064] The top of the lower cone 207 is slidably sealedly connected to the inner wall of the assembly cylinder 202, and the lower part of the assembly cylinder 202 is radially slidably connected to a group of lower slips 209 that cooperate with the lower cone 207. The lower slips 209 are connected to the lower cone 207 by shear nails.

[0065] The bottom of the assembly cylinder 202 is connected to a connecting sleeve 210 in communication with the inner cavity, and the connecting sleeve 210 is slidingly and sealingly connected to a coaxially arranged inner tube 211, the top of the inner tube 211 is connected to the bottom of the lower cone 207, and the inner cavity is communicated. Example 5

[0066] like Figures 1 to 5 A method for using an inner ball type deflector for oil drilling includes an inner ball type deflector for oil drilling in the above embodiment, and the method for using the inner ball type deflector includes the following steps:

[0067] First, the deflector body 1, the anchoring string 2 and the sealing string 3 are connected in sequence. The deflector body 1 is connected to the wireless gyroscope and the working string upwards, the bottom of the deflector tube 103 of the deflector body 1 is fixedly connected to the assembly tube 202, and the sealing string 3 is connected to the injection joint 307 or the packer 314 downwards, and then it is lowered to the working position in the well using the working string.

[0068] Next, in the small-displacement working mode, mud is pumped into the well through the mud pump. The mud enters the sealing and pressure tubing string 3 through the inner cavity of the deflector body 1 and the inner cavity of the anchor tubing string 2, and then enters the injection joint 307 or the packer 314 through the small-diameter cavity 309, the large-diameter cavity 310, the diversion hole 303, the piston tube 305 and the support sleeve 306, and then enters the well through the injection joint 307 or the packer 314. The mud circulates normally. At this time, the wireless gyroscope is used to determine the casing window orientation.

[0069] Next, in the large-displacement working mode, after the wireless gyroscope orientation is completed, the mud pump displacement is increased, and the mud pushes the sealing ball 308 and the elastic ball holder 302 to move downward. After the elastic ball holder 302 falls into the large-diameter cavity 310 as a whole, the sealing ball 308 enters the elastic ball holder 302 and causes the supporting petals of the elastic ball holder 302 to open outward.

[0070] Then, the sealing ball 308 is seated on the sealing portion 312 of the injection joint 307 or the packer 314 after passing through the elastic ball holder 302, the piston tube 305 and the support sleeve 306, and blocks the internal flow channel.

[0071] (1) When the bottom of the sealing pipe string 3 is connected to the injection joint 307, the sealing ball 308 blocks the downward flow channel inside the injection joint 307, causing the pressure inside the pipe string to increase. As the pressure increases, the mud entering the pressure chamber 208 from the pressure transmission hole 203 pushes the upper cone 205 and the lower cone 207 to move, and after the shear nails connecting the upper slip 204 and the lower slip 209 are cut off, the upper cone 205 and the lower cone 207 continue to move toward the upper and lower ends, thereby pushing the upper slip 204 and the lower slip 209 outward and tightening them to the inner wall of the casing in the well.

[0072] (2) When the bottom of the sealing pipe string 3 is connected to the packer 314, the sealing ball 308 blocks the downward flow channel inside the piston tube 305, thereby increasing the pressure inside the pipe string. While driving the anchoring pipe string 2 to anchor, the internal hydraulic pressure of the pipe string pushes the piston cylinder 315 to drive the guide key 317 to move downward, and the guide key 317 drives the slip ring 318 to press the rubber cylinder 320 downward. The top of the rubber cylinder 320 installed between the plug 321 and the slip ring 318 is squeezed and expanded outward, and is tightened and fixed on the inner wall of the casing in the well. The entire set of pipe strings is fixed in the casing in the well through the packer 314 and the anchoring pipe string 2, and the fixation is more firm and stable.

[0073] Finally, by rotating the lifting tube 101, the thread between the lifting tube 101 and the connecting tube 201 is removed, and then the lifting tube 101 is lifted, and the lifting block 104 outside the lifting tube 101 pulls the straightening ring 102, and the shear nails between the straightening ring 102 and the inclined guide tube 103 are cut, so that the lifting tube 101, the straightening ring 102 and the inclined guide tube 103 are separated, and the wireless gyroscope is lifted out of the wellhead along with the lifting tube 101, and the anchoring string 2 and the sealing string 3 are left in the well as the well retention part.

[0074] The present invention designs the sealing ball 308 to be built inside the sealing pipe string 3, and the wireless gyroscope and the sealing ball 308 are lowered into the well together with the whole pipe string, thereby replacing the tedious operation of the traditional pipe string operation, which requires first lifting the gyroscope out of the wellhead through the armored cable to make the internal space of the entire pipe string conductive before lowering the sealing ball 308 to seal it. This simplifies the working steps and improves the working efficiency. It can also adapt to the currently promoted wireless gyroscope and replace the obsolete limited gyroscope, thereby avoiding the tedious lowering and lifting process of the wired gyroscope and reducing the working time and working cost.

[0075] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. An inner ball type deflector for oil drilling, comprising a deflector body, the bottom of which is connected to an anchoring pipe column, characterized in that: The bottom of the anchoring pipe string is connected with a sealing pipe string; The sealing column comprises an outer cylinder, the inner cavity of which is divided into a small diameter cavity and a large diameter cavity which are connected to each other from top to bottom. A sealing ball, an elastic ball holder, a piston tube and a support sleeve are arranged in the cavity of the outer cylinder from top to bottom. The upper part of the elastic ball holder is located in the small diameter cavity, and the lower part is located in the large diameter cavity. The top of the piston tube is connected to the elastic ball holder and the inner cavity is connected. The outside of the piston tube is provided with a first outer step portion which is slidably and sealedly connected to the large diameter cavity. A guide hole is provided on the wall of the piston tube at a position above the first outer step portion. A spring is sleeved on the outside of the piston tube. The two ends of the spring respectively support the first outer step portion and the support sleeve. The support sleeve is fixedly connected to the cavity of the outer cylinder body. The bottom of the piston tube penetrates into the support sleeve. The bottom of the outer cylinder is connected with a liquid injection joint or a packer, and a sealing part adapted to the sealing ball is arranged in the cavity of the liquid injection joint or the cavity of the packer.

2. The inner ball type deflector for oil drilling according to claim 1, characterized in that: The liquid injection joint is provided with a group of liquid outlet holes which connect the inner cavity with the outside.

3. The inner ball type deflector for oil drilling according to claim 1, characterized in that: The packer comprises a central tube fixedly connected to the bottom of the outer cylinder, a plug is connected to the bottom of the central tube, and a vertically opened guide groove is provided on the wall of the central tube; The outer wall of the central tube is provided with a sliding ring and a rubber tube, the inner cavity of the central tube is slidably connected with a piston tube, the top of the piston tube extends into the bottom cavity of the outer cylinder body, and the top of the piston tube is provided with a second outer step portion which is slidably and sealingly connected with the inner cavity of the outer cylinder body, the inner top of the central tube is provided with a thrust ring, and the inner wall of the thrust ring and the outer wall of the piston tube are provided with mutually matching one-way tooth grooves; The middle of the piston cylinder is provided with a liquid injection hole connected with the guide groove, and the bottom of the piston cylinder is provided with a radially arranged guide key, and the end of the guide key passes through the guide groove and presses on the top of the slip ring.

4. The inner ball type deflector for oil drilling according to claim 1, characterized in that: The deflector body includes a deflection guide tube and a lifting tube inserted into the deflection guide tube. The outer wall of the lifting tube is slidably sleeved with a straightening ring, the straightening ring is connected to the deflection guide tube through shear nails, and the outer wall of the lifting tube is provided with a lifting block that cooperates with the straightening ring.

5. The inner ball type deflector for oil drilling according to claim 1, characterized in that: The anchoring pipe column comprises an assembly tube, and a connecting pipe for connecting with the deflector body is provided on the top of the assembly tube; A driving tube is arranged in the assembly tube, an annular pressure-bearing cavity is formed between the driving tube and the assembly tube, and a pressure transmission hole is arranged on the tube wall of the driving tube to connect the inner cavity of the driving tube with the pressure-bearing cavity; The top of the driving tube is connected to an upper cone connected to the inner cavity, the bottom of the upper cone is slidably and sealedly connected to the inner wall of the assembly tube, the upper part of the driving tube is radially slidably connected to a group of upper slips matched with the upper cone, and the upper slips are connected to the upper cone by shear nails; The lower part of the driving tube is sleeved with a lower cone, and the inner wall of the lower cone and the outer wall of the driving tube are provided with mutually matching one-way tooth grooves, the top of the lower cone is slidably and sealedly connected with the inner wall of the assembly tube, and the lower part of the assembly tube is radially slidably connected with a group of lower slips matching with the lower cone, and the lower slips are connected to the lower cone by shear nails; The bottom of the assembly cylinder is connected to a connecting sleeve connected to the inner cavity, and a coaxially arranged inner pipe is slidably and sealably connected inside the connecting sleeve. The top of the inner pipe is connected to the bottom of the lower cone and the inner cavity is connected.

6. The inner ball type deflector for oil drilling according to claim 3, characterized in that: An annular space gap is arranged between the piston cylinder and the outer cylinder body, and a pressure relief hole for connecting the outside with the annular space gap is arranged on the outer cylinder body.

7. A method for using an inner ball type deflector for oil drilling, characterized in that: A ball-in-the-wall deflector for oil drilling according to any one of claims 1 to 6, wherein the method of using the deflector comprises the following steps: First, the deflector body, anchoring string and sealing string are connected in sequence. The deflector body is connected to the wireless gyroscope and the working string upwards, and the sealing string is connected to the injection joint or the packer downwards. Then, the working string is lowered to the working position in the well. Next, in the small displacement working mode, mud is pumped into the well through the mud pump. The mud enters the sealing and pressure pipe string through the inner cavity of the deflector body and the inner cavity of the anchor pipe string, and then enters the injection joint or the packer through the small diameter cavity, the large diameter cavity, the diversion hole, the piston tube and the support sleeve, and then enters the well through the injection joint or the packer. The mud circulates normally. At this time, the wireless gyroscope is used to determine the casing window orientation. Next, in the large-displacement working mode, after the wireless gyro orientation is completed, the displacement of the mud pump is increased, and the mud pushes the sealing ball and the elastic ball holder downward. After the elastic ball holder falls into the large-diameter cavity as a whole, the sealing ball enters the elastic ball holder and causes the supporting petals of the elastic ball holder to open outward; Then the sealing ball is seated on the sealing part of the injection joint or the packer through the elastic ball holder, the piston tube and the support sleeve, and blocks the internal flow channel; Next, the sealing ball blocks the downward flow channel, causing the pressure inside the pipe string to increase. As the pressure increases, the anchor pipe string is tightened and anchored on the inner wall of the casing in the well. Finally, the deflector is separated, and the working string is lifted up to lift the gyroscope out of the wellhead, while the anchor string and the sealing string remain in the well.

8. The method for using the inner ball type deflector for oil drilling according to claim 7, characterized in that: When the bottom of the anchor string is connected to the packer, the sealing ball seat seals the internal flow channel of the packer, and the internal pressure of the entire string increases. While the anchor string is tightened and anchored, the packer is also tightened and sealed in the casing.

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