CN116411907A

CN116411907A - Oil well fracturing device and process with sliding sleeve opening function

Info

Publication number: CN116411907A
Application number: CN202111648758.2A
Authority: CN
Inventors: 张矿生; 刘汉斌; 桂捷; 刘忠能; 王治国; 刘峰; 任国富; 唐梅荣; 蒙鑫; 刘洋
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-07-11

Abstract

The invention relates to an oil well fracturing device with a sliding sleeve opening function and a process thereof, wherein a moving track for the oil well fracturing process is arranged on a central tube of a fracturing packer in the device, one end of the central tube is fixedly provided with a guide head, the other end of the central tube is sequentially sleeved with a rubber sleeve, a conical surface push ring and a slip from outside to inside, the central tube is elastically sleeved with a slip sheet, one end of the slip sheet is axially fixed with the slip sheet, a sliding block is fixed below the slip sheet, and the sliding block slides in the moving track of the central tube; the central tube is sleeved in the sliding sleeve, the sliding sheet is tightly attached to the inner wall of the core, a limit groove is formed in one end, far away from the conical surface push ring, of the inner wall of the core, one end of the core is inserted into the outer tube, the other end of the core is inserted into the sand blasting body, and a sand blasting hole is formed between the outer tube and the sand blasting body. When the oil well fracturing process is carried out, the sliding sleeve is connected with the sleeve string according to the requirement, then the fracturing packer, the sand blaster and the oil pipe string are connected into the sleeve string in sequence, and when the fracturing packer reaches the corresponding sliding sleeve, the subsequent process operation is started.

Description

Oil well fracturing device and process with sliding sleeve opening function

Technical Field

The invention relates to the field of oil well fracturing, in particular to an oil well fracturing device with a sliding sleeve opening function and a process.

Background

For oil well multistage fracturing, the construction efficiency is improved, the operation cost is saved, and the method is one of main attack directions of the fracturing process.

At present, two processes of bridge jet linkage and bottom seal dragging hydraulic sand blasting perforation fracturing are mainly adopted in a process field. For the bridge shooting linkage operation, each pipe column can only fracture one section, each pipe column uses 1 set of bridge plug, and the operation cost is relatively high; for the hydraulic sand blasting perforation fracturing of the bottom seal dragging, in order to realize sand blasting perforation, the bottom end of the oil pipe string is connected with an ejector with a throttling function, so that the construction displacement of the oil pipe is limited, and the construction displacement is obviously lower than that of bridge blasting.

Therefore, a new fracturing tool packer needs to be developed in a targeted manner so as to save cost and meet the reconstruction requirement of large-displacement staged fracturing.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the oil well fracturing device and the process with the sliding sleeve opening function, which can simultaneously finish the annular space between the split sleeve string and the oil pipe string and open the sliding sleeve, and establish a fracturing fluid communication channel, thereby providing an efficient fracturing tool and method for the staged fracturing reformation of the oil well.

In order to achieve the above purpose, the invention adopts the following technical scheme:

an oil well fracturing device with a sliding sleeve opening function comprises a fracturing packer and a sliding sleeve;

a moving track for an oil well fracturing process is axially arranged on a central tube of the fracturing packer, a guide head is fixed at one end of the central tube, a rubber cylinder, a conical surface push ring and a slip are sequentially sleeved at the other end of the central tube from outside to inside, the lower conical surface of the conical surface push ring and the inner conical surface of the slip are arranged in opposite directions, a slip sheet is elastically sleeved on the central tube, one end of the slip sheet is fixedly arranged with the slip along the axial direction, a slip block is fixed below the slip sheet, and the slip block is arranged in the moving track of the central tube in a sliding manner;

the center pipe sleeve is arranged in the sliding sleeve, the sliding sheet is clung to the inner wall of the core of the sliding sleeve, a limit groove is formed in one end, far away from the conical surface push ring, of the inner wall of the core, one end of the core is inserted into the outer cylinder, the other end of the core is inserted into the sand blasting body, and a sand blasting hole is formed between the outer cylinder and the sand blasting body.

Preferably, the number of the rubber barrels is 2-4, all the rubber barrels are mutually attached, and two ends of all the rubber barrels are respectively clamped between the backwashing body and the conical surface push ring of the fracturing packer.

Preferably, the sliding vane is inserted into the limiting block from inside to outside along the radial direction, and the sliding vane protrudes out of the upper surface of the limiting block.

Further, the sliding vane is of a hollow structure, a baffle ring is sleeved on the central tube, an annular space is formed after the sliding vane contacts with the central tube, the baffle ring is positioned in the annular space, and a first pressing reed is arranged between the baffle ring and the top of the sliding vane.

Still further, the slip sheet, the first pressing reed and the slip are all symmetrically provided with 3 to 5 pieces along the circumferential direction of the central tube.

Still further, all slips are sleeved with limiting rings.

Still further, still include the lock ring of cover on the center tube, the gleitbretter is fixed in the lower extreme of lock ring, and the longitudinal section of lock ring is L type, and the perpendicular section of lock ring is pegged graft in the stopper, and the horizontal segment of lock ring passes through thread tightening and slips fixed connection.

Preferably, the first axial groove is formed in the outer surface of the core, the second pressing reed is fixed in the first groove, the upper end of the second pressing reed is tightly propped in the second groove of the outer cylinder, the positions of the first groove and the second groove are corresponding, the inner wall of the outer cylinder is provided with the third groove, the third groove is axially located between the limit groove and the first groove, and the shape of the third groove is identical with that of the second groove.

An oil well fracturing process with a sliding sleeve opening function, based on any one of the oil well fracturing devices with the sliding sleeve opening function, comprises the following steps:

step 1, firstly connecting a plurality of sliding sleeves according to the set interval by using a sleeve string according to the requirements of an oil well fracturing process, and then sequentially connecting a fracturing packer, a sand ejector and an oil pipe string into the sleeve string;

step 2, when the fracturing packer reaches the corresponding sliding sleeve, operating according to an oil well fracturing process, enabling a sliding sheet to move relative to a central tube in a moving track of the central tube, enabling a core to move, opening a sand spraying hole, enabling fracturing fluid to press a reservoir through the sand spraying hole, completing first-stage fracturing, and then lifting an oil tube string;

and 3, completing fracturing of all the intervals corresponding to the residual sliding sleeve according to the process of the step 2.

And further, in the step 2, when the fracturing packer reaches the corresponding sliding sleeve, connecting the telescopic compensation joint at the wellhead, connecting and fixing the telescopic compensation joint on the ground fracturing wellhead, and then operating according to an oil well fracturing process.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the oil well fracturing device with the sliding sleeve opening function, the guide head is fixed at one end of the central pipe, so that the movement direction of the central pipe in the sliding sleeve can be guided, and after the conical surface push ring and the slips are sleeved at the other end of the central pipe from outside to inside in sequence, as the lower conical surface of the conical surface push ring and the inner conical surface of the slips are arranged in opposite directions, when the conical surface push ring moves inwards, the slips are opened, and the connection between the conical surface push ring and the slips is realized; the sliding vane is elastically sleeved on the central tube, so that the sliding vane can be tightly attached to the inner wall of the core of the sliding sleeve, one end of the sliding vane is fixed with the sliding vane along the axial direction, the sliding vane is fixed with the sliding block below the sliding vane, the sliding block can slide in the moving track of the central tube, the conical surface push ring, the sliding vane and the sliding block can be ensured to form an axial moving assembly, the sliding vane is driven by the sliding block to move to the limit groove firstly, the pipe column positioning of the fracturing process can be completed in the mode, finally, the slip teeth of the sliding vane are clamped at the limit groove, the sand spraying hole can be opened by the movement of the core, the rubber cylinder is tightly propped against the inner wall of the core, and then the layer section at the lower end of the sliding vane is sealed, so that the oil well fracturing process can be carried out, and the layer section fracturing corresponding to the sliding sleeve is completed. The device has the function of opening the sliding sleeve, can play a role in segmentation between sections, can complete the fracturing of the whole well section by putting the oil pipe string into one time, has no limit on construction discharge capacity, and can provide matched tool support for the staged fracturing process.

According to the oil well fracturing process with the sliding sleeve opening function, a plurality of sliding sleeves are connected with a sleeve string according to the requirement of the oil well fracturing process, and then a fracturing packer, a sand blaster and an oil pipe string are sequentially connected into the sleeve string; when the fracturing packer reaches the corresponding sliding sleeve, the fracturing packer can be operated according to an oil well fracturing process, at the moment, the sliding sheet moves relative to the central tube in a moving track of the central tube, the sand spraying holes can be opened by movement of the core, fracturing fluid can fracture the reservoir through the sand spraying holes, the first stage of fracturing is finished, then the oil pipe string is lifted up to repeatedly operate, and fracturing of all layers corresponding to the remaining sliding sleeve can be finished. The invention can complete the fracturing of the whole well section by putting the oil pipe string into one pass without limiting the construction discharge capacity, thereby solving the problems of more bridge injection and joint working passes, large tool consumption and high cost and solving the problem of limited construction discharge capacity of the hydraulic jet fracturing pipe column dragged by the bottom seal.

Drawings

FIG. 1 is a schematic semi-sectional view of a connection structure between a fracturing packer and a first sliding sleeve according to the present invention.

Fig. 2 is a schematic diagram of an oil well fracturing process according to the present invention.

Fig. 3 is a schematic view of the outer surface of the center tube of fig. 1 after the movement track is circumferentially spread.

In the figure: a guide head 1; a central tube 2; a limiting block 3; a sliding sheet 4; a first pressing reed 5; a connection ring 6; a slider 7; a stop collar 8; a slip 9; slip bowl 9.1; conical push ring 10; a first rubber cylinder 11; a second rubber cylinder 12; a third rubber cylinder 13; a backwash tank 14; a backwash body 15; a check valve 16; a baffle 16.1; steel ball 16.2; a limit joint 17; an upper joint 18; a first sliding sleeve 19; a core 19.1; an outer cylinder 19.2; a blasting body 19.3; sand blast hole 19.4; a limit groove 19.5; a second sliding sleeve 20; a third sliding sleeve 21; a fourth runner 22; a fracturing packer 23; a sand blaster 24; tubing string 25; a casing string 26; a telescopic compensation joint 27; a second spring 28.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The invention discloses an oil well fracturing device with a sliding sleeve opening function, which is shown in figure 1 and comprises a fracturing packer 23 and a sliding sleeve, wherein the fracturing packer 23 comprises a rubber sleeve, a guide head 1, a central tube 2, a conical surface push ring 10, a backwashing body 15, a limit joint 17, an upper joint 18 and an axial movement assembly consisting of a limit block 3, a sliding sheet 4, a first pressing reed 5, a connecting ring 6, a sliding block 7, a limit ring 8 and a slip 9. The structure at the left side of the rubber cylinder is existing, namely comprises a backwashing body 15, a check valve 16, a baffle 16.1, a steel ball 16.2, a limiting joint 17 and an upper joint 18, wherein the limiting joint 17; the upper joint 18 is provided with a backwash tank 14.

The backwashing body 15 is fixedly connected with the central tube 2, and a motion track for the oil well fracturing process shown in figure 3 is axially arranged on the central tube 2, wherein E, A forms a setting track; the straight line where C is located is a descending track, the straight line where B is located is an ascending track, the straight line where D is located is also an ascending track, the transition between the straight line and the ascending track is an arc transition, the sliding block 7 can slide freely, and the four tracks axially bisect the central tube 2. The one end of center tube 2 is fixed with direction head 1, and the other end is from outside-in cover in proper order to be equipped with packing element, conical surface push ring 10 and slips 9, and the lower conical surface of conical surface push ring 10 can arrange in opposite directions with the interior conical surface of slips 9 like this, and the elastic sleeve is equipped with gleitbretter 4 on the center tube 2, and the one end of gleitbretter 4 is fixed with slips 9 along the axial, and the below is fixed with slider 7, and slider 7 slides in the motion track of center tube 2. The center tube 2 is sleeved in the core 19.1 of the sliding sleeve, the sliding vane 4 is tightly attached to the inner wall of the core 19.1 of the sliding sleeve, a limit groove 19.5 is formed in one end, far away from the conical surface push ring 10, of the inner wall of the core 19.1, one end of the core 19.1 is inserted into the outer barrel 19.2, the other end of the core is inserted into the sand blasting body 19.3, a sand blasting hole 19.4 is formed between the outer barrel 19.2 and the sand blasting body 19.3, one ends of the outer barrel 19.2 and the core 19.1 are both connected, and a sleeve string 26 is convenient to install afterwards.

Generally, 2 to 4 rubber barrels can be arranged, 3 rubber barrels are shown in fig. 1, namely, a first rubber barrel 11, a second rubber barrel 12 and a third rubber barrel 13 are mutually attached, and two ends of the 3 rubber barrels are respectively clamped between a backwashing body 15 and a conical surface push ring 10. In addition, when the sliding vane 4 is specifically installed, the limiting block 3 is sleeved on the central tube 2, the sliding vane 4 can be inserted into the limiting block 3 from inside to outside along the radial direction, and the sliding vane 4 protrudes out of the upper surface of the limiting block 3.

In order to realize the elastic arrangement of the sliding sheets, the sliding sheets 4 are designed into a hollow structure, a baffle ring is sleeved on the central tube 2, an annular space can be formed after the sliding sheets 4 are contacted with the central tube 2, the baffle ring is placed in the annular space, and a first pressing reed 5 can be arranged between the baffle ring and the top of the sliding sheets 4. In the same way, the slip sheet 4, the first pressing reed 5 and the slip 9 may be symmetrically provided with 3 to 5 pieces along the circumferential direction of the center tube 2. A limiting ring 8 is specifically sleeved on all the slips 9.

In a specific structural design, the connecting ring 6 is sleeved on the central tube 2, the sliding sheets 4 can be fixed at the lower end of the connecting ring 6, and the longitudinal section of the connecting ring 6 is designed into L shape, so that the vertical section of the connecting ring 6 can be inserted into the limiting block 3, and the horizontal section of the connecting ring 6 is fixedly connected with the slips 9 through a thread buckle.

In order to realize the stability of the sliding sleeve, the outer surface of the core 19.1 is provided with a first axial groove, a second pressing reed 28 is fixed in the first groove, the upper end of the second pressing reed 28 is propped against the second groove of the outer barrel 19.2, the positions of the first groove and the second groove are corresponding, the inner wall of the outer barrel 19.2 is provided with a third groove which is clear in fig. 1, so the third groove is not marked, and is particularly positioned between the limiting groove 19.5 and the first groove along the axial direction, and therefore, the second pressing reed 28 needs to move into the third groove after that, so the shapes of the third groove and the second groove are designed to be the same.

It can be seen from fig. 1 that the connection ring 6 connects the limiting block 3 and the limiting ring 8 as a whole, the sliding sheet 4, the first pressing reed 5 and the sliding sheet 9 can be symmetrically arranged along the circumference of the central tube 2, the sliding sheet 9 is provided with the sliding sheet teeth 9.1, the included angle between the inner conical surface of the sliding sheet 9 after being opened and the central axis is 65-75 degrees and is matched with the lower conical surface of the conical surface push ring 10, and the left side of the 13 can be regarded as an integral structure.

When the well is put into the well, the sliding vane 4 is tightly attached to the inner wall surface of the central tube 2 under the action of the first pressing reed 5 and can form a radial friction force of 490N, when the central tube 2 of the fracturing packer 23 moves up and down, the sliding block 7 drives the axial movement component to move relative to the central tube 2 in the movement track and can change the track, and the relative position limit of the axial movement component and the central tube 2 in the axial direction is determined by the movement track.

As shown in fig. 2 for one specific well fracturing process, the fracturing process string comprises a first sliding sleeve 19, a second sliding sleeve 20, a third sliding sleeve 21, a fourth sliding sleeve 22, a casing string 26, a fracturing packer 23, a sand blaster 24, an oil string 25, and a telescoping compensation joint 27.

Before fracturing, according to the fact that the first sliding sleeve 19, the second sliding sleeve 20, the third sliding sleeve 21 and the fourth sliding sleeve 22 are connected with the sleeve string 26, the fracturing packer 23, the sand blaster 24 and the oil pipe string 25 are sequentially connected and put into the sleeve string 26, the fracturing packer 23 and the sand blaster 24 can be fixed through screw threads, and when the fracturing packer 23 reaches the preset first sliding sleeve 19, the well head is connected and fixed on a ground fracturing well head after the well head is connected with the telescopic compensation joint 27. The core 19.1, the outer cylinder 19.2 and the sand blasting holes 19.4 are arranged in the first sliding sleeve 19, the core 19.1 can axially move relative to the outer cylinder 19.2 under the action of axial force, the fracturing packer 23 can open the first sliding sleeve 19 and seal the layer segments at the lower end of the first sliding sleeve 19, and then fracturing of the layer segments corresponding to the first sliding sleeve 19 can be carried out.

The sand blaster 24 and the fracturing packer 23 are sent to the first sliding sleeve 19 by the oil pipe string 25, and the fracturing process pipe column positioning is completed when the hanging weight changes by observing the hanging weight, because the wellhead pipe column has dead weight when the sliding sheet 4 on the fracturing packer 23 slides out of the limit groove 19.5 when moving to the inside of the first sliding sleeve 19, and resistance is encountered at the moment. The telescopic compensation joint 27 can be matched with an oil pipe adjusting nipple to be connected and fixed on a ground fracturing wellhead. When the telescopic compensation joint 27 is used as a connecting nipple of the oil pipe string 25 and the ground fracturing wellhead, the movement elongation of the lower end of the oil pipe string 25 can be compensated, so that the sand blasting hole 19.4 can be opened by the movement of the pushing core 19.1 through the third rubber cylinder 13 by utilizing the hydraulic piston force of the shaft.

Specifically, the first sliding sleeve 19 is accurately positioned by lifting and lowering the oil pipe string 25, the moving track of the axial moving assembly can be changed to the setting track, the pipe column of the oil pipe string 25 is loaded on the fracturing packer 23 by the self weight, and the setting segmentation of the fracturing packer 23 is completed. Hydraulic pressure is applied from a wellhead oil pipe or a sleeve pipe, a piston is formed above the third rubber cylinder 13 and the sliding sleeve core 19.1, the hydraulic force pushes the core 19.1 on the first sliding sleeve 19 to move downwards, the telescopic compensation joint 27 stretches until the sand blasting hole 19.4 is opened, and a fracturing fluid passage is formed. The fracturing fluid is injected from the surface through the annular space between the casing string 26 and the tubing string 25 simultaneously, and the reservoir is fractured through the sand blasting holes 19.4 to complete the first stage of fracturing.

In the process of connecting the wellhead lowering oil pipe string 25, the oil pipe string 25 drives the central pipe 2 to move downwards onto the setting track of fig. 3, and at this time, the axial movement assembly moves downwards together with the central pipe 2 in the axial direction. The slips 9 move to the limit groove 19.5 and are anchored at the limit groove 19.5, the oil pipe string 25 is continuously lowered, when the sliding block 7 moves to the point A due to dead weight, the slips 9 are contacted with the conical surface push ring 10 and start to expand, the axial movement assembly pushes the conical surface push ring 10 on the fracturing packer 23 to compress the first rubber cylinder 11, the second rubber cylinder 12 and the third rubber cylinder 13 to expand outwards and cling to the inner wall surface of the sliding sleeve core 19.1, the annular space between the oil pipe string 25 and the sleeve string 26 is divided into an upper isolated part and a lower isolated part until the wellhead is connected and fixed with the pipe string, and the dead weight of the pipe string is loaded on the fracturing packer 23.

After the fracturing is finished, the oil pipe string 25 is lifted, the fracturing packer 23 is unsealed, the backwashing body 15 and the central pipe 2 move upwards together, the axial acting force of the first rubber cylinder 11, the second rubber cylinder 12, the third rubber cylinder 13 and the conical surface pushing ring 10 disappears, the first rubber cylinder 11, the second rubber cylinder 12 and the third rubber cylinder 13 retract, the conical surface pushing ring 10 moves upwards along with the central pipe 2, the slips 9 lose the support of the conical surface pushing ring 10, and the anchoring with the core limiting groove 19.5 is released. And continues to rise to the upper end of the second runner 20.

Repeating the operation until all the intervals corresponding to the residual sliding sleeve are fractured, and completing the whole-well-interval fracturing transformation.

Claims

1. The oil well fracturing device with the sliding sleeve opening function is characterized by comprising a fracturing packer (23) and a sliding sleeve;

a moving track for an oil well fracturing process is axially arranged on a central tube (2) of the fracturing packer (23), a guide head (1) is fixed at one end of the central tube (2), a rubber cylinder, a conical surface push ring (10) and a slip (9) are sequentially sleeved at the other end of the central tube (2) from outside to inside, a lower conical surface of the conical surface push ring (10) and an inner conical surface of the slip (9) are oppositely arranged, a slip sheet (4) is elastically sleeved on the central tube (2), one end of the slip sheet (4) is fixedly arranged with the slip (9) along the axial direction, a sliding block (7) is fixed below the slip sheet (4), and the sliding block (7) is slidably arranged in the moving track of the central tube (2);

the central tube (2) sleeve is arranged in the sliding sleeve, the sliding sheet (4) is tightly attached to the inner wall of the core (19.1) of the sliding sleeve, a limit groove (19.5) is formed in one end, far away from the conical surface push ring (10), of the inner wall of the core (19.1), one end of the core (19.1) is inserted into the outer cylinder (19.2), the other end of the core (19.1) is inserted into the sand blasting body (19.3), and a sand blasting hole (19.4) is formed between the outer cylinder (19.2) and the sand blasting body (19.3).

2. The oil well fracturing device with the sliding sleeve opening function according to claim 1, wherein the number of the rubber barrels is 2-4, all the rubber barrels are mutually attached, and two ends of all the rubber barrels are respectively clamped between a backwashing body (15) of a fracturing packer (23) and a conical surface push ring (10).

3. The oil well fracturing device with the sliding sleeve opening function according to claim 1, further comprising a limiting block (3) sleeved on the central tube (2), wherein the sliding sheets (4) are inserted into the limiting block (3) from inside to outside in the radial direction, and the sliding sheets (4) protrude out of the upper surface of the limiting block (3).

4. The oil well fracturing device with the sliding sleeve opening function according to claim 3, wherein the sliding sheet (4) is of a hollow structure, a baffle ring is sleeved on the central tube (2), an annular space is formed after the sliding sheet (4) is contacted with the central tube (2), the baffle ring is located in the annular space, and a first pressing reed (5) is arranged between the baffle ring and the top of the sliding sheet (4).

5. The oil well fracturing apparatus with the sliding sleeve opening function according to claim 3, wherein 3-5 sliding sheets (4), the first pressing reed (5) and the slips (9) are symmetrically arranged along the circumferential direction of the central pipe (2).

6. An oil well fracturing apparatus with sliding sleeve opening function according to claim 3, characterized in that all slips (9) are sleeved with limiting rings (8).

7. The oil well fracturing device with the sliding sleeve opening function according to claim 3, further comprising a connecting ring (6) sleeved on the central pipe (2), wherein the sliding sheets (4) are fixed at the lower end of the connecting ring (6), the longitudinal section of the connecting ring (6) is L-shaped, the vertical section of the connecting ring (6) is inserted into the limiting block (3), and the horizontal section of the connecting ring (6) is fixedly connected with the slips (9) through screw buckles.

8. The oil well fracturing device with the sliding sleeve opening function according to claim 1, wherein an axial first groove is formed in the outer surface of the core (19.1), a second pressing reed (28) is fixed in the first groove, the upper end of the second pressing reed (28) is tightly propped in a second groove of the outer barrel (19.2), the positions of the first groove and the second groove are corresponding, a third groove is formed in the inner wall of the outer barrel (19.2), the third groove is located between the limiting groove (19.5) and the first groove along the axial direction, and the shape of the third groove is identical with that of the second groove.

9. An oil well fracturing process with a sliding sleeve opening function, which is characterized by comprising the following steps of:

step 1, firstly connecting a plurality of sliding sleeves according to the requirements of an oil well fracturing process by using a sleeve string (26) according to set intervals, and then sequentially connecting a fracturing packer (23), a sand ejector (24) and an oil pipe string (25) into the sleeve string (26);

step 2, when the fracturing packer (23) reaches the corresponding sliding sleeve, operating according to an oil well fracturing process, enabling the sliding sheet (4) to move relative to the central tube (2) in a moving track of the central tube (2), enabling the core (19.1) to move, opening the sand spraying holes (19.4), enabling fracturing fluid to press the reservoir through the sand spraying holes (19.4), completing first-stage fracturing, and then lifting the oil tube string (25);

10. The oil well fracturing process with the sliding sleeve opening function according to claim 9, wherein in the step 2, when the fracturing packer (23) reaches the corresponding sliding sleeve, a telescopic compensation joint (27) is connected to a wellhead, then the telescopic compensation joint is connected and fixed to a ground fracturing wellhead, and then the oil well fracturing process is operated.