Ball-passing jet type well cementation fracturing sliding sleeve

Abstract

The utility model relates to the technical field of oil exploitation equipment, and discloses a ball-passing jet type well cementation fracturing sliding sleeve which comprises an upper connector and a lower connector, an outer cylinder is connected between the upper connector and the lower connector, an inner cylinder is connected in the outer cylinder, a plurality of communicating holes are formed in the cylinder wall of the outer cylinder, the communicating holes penetrate through the cylinder wall of the outer cylinder, and the outer ring of the inner cylinder is tangent to the inner ring of the outer cylinder. An elastic ball seat is arranged at the position, close to the upper connector, of the outer cylinder, the outer ring of the elastic ball seat abuts against the inner ring of the outer cylinder, the end, away from the upper connector, of the elastic ball seat abuts against the end of the inner cylinder, and at the moment, the diameter of the inner ring of the elastic ball seat is smaller than the diameter of a pitching ball, so that the inner cylinder slides towards the lower connector in the outer cylinder; an expansion groove is circumferentially formed in the cylinder wall of the inner ring of the outer cylinder, the communicating hole is located between the expansion groove and the end, close to the upper connector, of the outer cylinder, the elastic ball seat is embedded into the expansion groove, the diameter of the inner ring of the elastic ball seat is larger than that of the thrown ball, the thrown ball penetrates through the elastic ball seat and continues to fall down, and the effects of achieving multiple purposes and saving materials are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil exploitation equipment technical field, concretely relates to pass ball injection type well cementation fracturing sliding sleeve. BACKGROUND

[0002] Well completion refers to the process of connecting the well bottom and the oil and gas layer with a certain structure after the well reaches the predetermined depth, which is an important link between drilling and production, and the quality of well completion directly affects the production capacity and economic life of the oil and gas well, and even relates to whether the entire oil field can be developed reasonably.

[0003] After the well cementing sliding sleeve and the well completion casing are fixedly connected and put into the mine, the inside of the well cementing sliding sleeve and the well completion casing needs to be cleaned, and after cleaning, the cleaning liquid needs to be discharged from the communication hole, and during fracturing, the pressure in the wellbore needs to be discharged from the communication hole to the rock formation. In these operation processes, several sections of the well cementing sliding sleeve in the wellbore need to be connected with the outside world. The prior art uses a dissolvable ball to be thrown from the ground into the wellbore, and when the ball passes through the well cementing sliding sleeve, it falls into the ball seat. The outside equipment injects liquid under high pressure into the well, the liquid pressure acts on the ball, the ball transmits force to the ball seat, the ball seat drives the sliding sleeve to slide in the connecting outer sleeve, and finally the inside of the connecting outer sleeve is connected with the outside through the communication hole. However, one ball can only act on one sliding sleeve, and after the action, the ball is dissolved, and the method for unlocking the subsequent sliding sleeve is the same as the above. Although the prior art solves the problem of waste material of the sliding sleeve. SUMMARY

[0004] The utility model intends to provide pass ball injection type well cementation fracturing sliding sleeve, to realize one ball multiple use, save material's purpose.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: pass ball injection type well cementation fracturing sliding sleeve, including upper joint and lower joint, the upper joint and lower joint are connected with the outer tube between, the outer tube is connected with the inner tube in, the barrel wall of outer tube is equipped with a plurality of communication holes, the communication hole penetrates the barrel wall of outer tube, the outer circle of inner tube is tangent to the inner circle of outer tube, the outer circle of inner tube blocks the communication hole, the outer tube is close to the upper joint and is provided with the elastic ball seat, the outer circle of elastic ball seat is opposite to the inner circle of outer tube, the end of elastic ball seat away from the upper joint is opposite to the end of inner tube, the inner circle diameter of elastic ball seat is less than the ball diameter at this time, the elastic ball seat is used for receiving the ball and is pressed down the inner tube under the action of the ball, and the inner tube slides in the inside of outer tube to the lower joint direction, the inner circle barrel wall of outer tube is equipped with the expansion groove in the circumference, the communication hole is located between the expansion groove and the end of outer tube close to the upper joint, and the expansion groove is embedded for the elastic ball seat, and the inner circle diameter of elastic ball seat is greater than the ball diameter at this time.

[0006] The beneficial effect of the scheme is that the ball falls into the sliding sleeve, moves downward under the pressure drive, and drives the inner cylinder to slide downward in the outer cylinder, the inner cylinder no longer blocks the communication hole on the outer cylinder, the fracturing sliding sleeve is unlocked, and after unlocking, the ball continues to move downward and abuts the elastic ball seat against the expansion groove, the elastic ball seat is elastically expanded and embedded in the expansion groove, at this time, the inner diameter of the elastic ball seat increases, the ball passes through the elastic ball seat and falls into the next sliding sleeve to unlock the next sliding sleeve, compared with the prior art, the ball is not one-to-one unlocking, but unlocks multiple sliding sleeves, realizes one-to-many, and can realize one ball multiple use and save materials.

[0007] Further, the cylinder wall of the outer cylinder is provided with a plurality of threaded holes penetrating the cylinder wall of the outer cylinder, the cylinder wall of the inner cylinder is provided with a plurality of connecting holes corresponding to the threaded holes, and the threaded holes are connected with shear pins.

[0008] The beneficial effect of the scheme is that the inner cylinder and the outer cylinder are fixedly connected through the shear pins, which facilitates the fixation and cleaning of the wellbore in the early stage, and high-pressure liquid is injected into the wellbore before fracturing, the liquid drives the ball to be injected into the sliding sleeve, the shear pins are sheared under high-pressure injection, and the purpose of sliding the inner cylinder in the outer cylinder is achieved.

[0009] Further, the elastic ball seat comprises a plurality of arc-shaped elastic pieces that are mutually clamped, and the thickness of the arc-shaped elastic pieces is greater than the difference between the inner diameters of the expansion groove and the outer cylinder.

[0010] The beneficial effect of the scheme is that the elastic ball seat is elastically expanded after being embedded in the expansion groove, which facilitates the ball to pass through the elastic ball seat and enter the next sliding sleeve, and in addition, the elastic ball seat still protrudes from the inner circle of the outer cylinder, preventing the inner cylinder from shaking up and down to block the communication hole when the liquid is injected.

[0011] Further, the upper joint is sleeved in the outer cylinder and fixedly connected with the outer cylinder, the inner diameter of the upper joint is equal to the outer diameter of the inner cylinder, and the ball falls downward conveniently.

[0012] Further, the elastic ball seat is located between the end portions of the inner cylinder and the upper joint that are close to each other.

[0013] The beneficial effect of the scheme is that the elastic ball seat will not shake up and down due to the change of the pressure in the wellbore before the ball falls, and the purpose of fixing the elastic ball seat is achieved.

[0014] Further, the lower joint comprises a lower cylinder body and a lower connecting cylinder, which are integrally formed, the lower connecting cylinder is sleeved in the end portion of the outer cylinder and fixedly connected with the outer cylinder, the inner diameter of the lower connecting cylinder is equal to the inner diameter of the outer cylinder to facilitate the downward sliding of the inner cylinder, and the inner diameter of the lower cylinder body is smaller than the outer diameter of the inner cylinder to prevent the inner cylinder from sliding out.

[0015] Further, the inner circle of the outer cylinder is concave at both ends, facilitating the embedding and connection of the upper joint and the lower connecting cylinder, and the upper joint and the lower connecting cylinder are fixedly connected with the outer cylinder through threads, and the outer circle of the upper joint and the lower connecting cylinder close to the end of the outer cylinder is provided with an axial shoulder groove in the circumferential direction, which is used for embedding the outer cylinder.

[0016] The beneficial effects of the present application are that the outer cylinder is clamped through the axial shoulder grooves between the upper joint and the lower connecting cylinder at both ends, and when the completion casing drives several casings to fall into the wellbore, the relative sliding between the outer cylinder and the completion casing can be prevented.

[0017] Further, the arc-shaped elastic piece is provided with a groove and a protrusion at the two ends, respectively, and the protrusions and grooves of the arc-shaped elastic pieces are connected in a ring. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an overall structure explosion view of the embodiment of the present application;

[0019] Figure 2 It is a cross-sectional view of the embodiment of the present application before unlocking;

[0020] Figure 3 It is a cross-sectional view of the embodiment of the present application after unlocking;

[0021] Figure 4 It is a structure schematic view of the arc-shaped elastic piece of the embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be further described in detail through specific embodiments:

[0023] The reference signs in the drawings of the specification include: upper joint 1, lower joint 2, lower connecting cylinder 21, lower cylinder body 22, outer cylinder 3, inner cylinder 31, connecting hole 311, communication hole 32, elastic ball seat 33, arc-shaped elastic piece 331, groove 3311, protrusion 3312, expansion groove 34, threaded hole 35, shear pin 351, throwing ball 4, axial shoulder groove 5.

[0024] EMBODIMENT

[0025] The ball injection type well cementing and fracturing sliding sleeve, such as Figures 1-3As shown, the upper joint 1, the lower joint 2 and the outer cylinder 3 connected between the upper joint 1 and the lower joint 2 are included, the shaft shoulder groove 5 is arranged on the outer circle of the end of the outer cylinder 3, and the upper joint 1 is provided with threads, the upper joint 1 is sleeved on the outer cylinder 3 and connected to the outer cylinder 3 through threads, the lower joint 2 includes the lower connecting cylinder 21 close to the outer cylinder 3 and the lower cylinder body 22 away from the outer cylinder 3, the lower connecting cylinder 21 and the lower cylinder body 22 are integrally formed, the shaft shoulder groove 5 is also arranged on the outer circle of the end of the lower connecting cylinder 21 close to the outer cylinder 3, the lower connecting cylinder 21 is also provided with threads at the end, the lower connecting cylinder 21 is sleeved on the outer cylinder 3 and fixedly connected to the outer cylinder 3 through threads, the axial section of the upper joint 1 and the lower joint 2 is L-shaped at the shaft shoulder groove 5, the shaft shoulder groove 5 at the upper joint 1 and the lower joint 2 is embedded with the cylinder wall of the outer cylinder 3, the inner walls of both ends of the outer cylinder 3 are concave, used for embedding and connecting the ends of the upper joint 1 and the lower connecting cylinder 21, preventing the relative sliding between the outer cylinder 3 and the two during the process of the completion casing, and the inner circles of both ends of the outer cylinder 3 are concave, facilitating the embedding of the cylinder wall of the upper joint 1 and the lower connecting cylinder 21.

[0026] As shown in the figure, Figures 1-3 The inner cylinder 31 is sleeved on the outer cylinder 3, the outer diameter of the inner cylinder 31 is equal to the inner diameter of the outer cylinder 3, that is, the outer wall of the inner cylinder 31 is tangent to the inner wall of the outer cylinder 3, a plurality of threaded holes 35 are arranged on the outer cylinder 3 close to the lower joint 2 in the circumferential direction, the plurality of threaded holes 35 all penetrate the cylinder wall of the outer cylinder 3, the shear nails 351 are threadedly connected in the threaded holes 35, a plurality of connecting holes 311 corresponding to the plurality of threaded holes 35 are arranged on the outer wall of the inner cylinder 31 in the circumferential direction, the connecting holes 311 do not penetrate the cylinder wall of the inner cylinder 31, the shear nails 351 are threadedly connected to the outer cylinder 3 and penetrate the outer cylinder 3, the ends of the shear nails 351 are embedded in the connecting holes 311, so as to fixedly connect the inner cylinder 31 to the outer cylinder 3; the outer cylinder 3 is also provided with a plurality of communication holes 32 in the circumferential direction, the communication holes 32 are used for connecting the inside of the outer cylinder 3 with the outside, the outer wall of the inner cylinder 31 blocks the communication holes 32, the inner diameter of the lower connecting cylinder 21 is equal to the inner diameter of the outer cylinder 3, facilitating the sliding of the inner cylinder 31 inside, and the inner diameter of the lower cylinder body 22 is smaller than the outer diameter of the inner cylinder 31, preventing the inner cylinder 31 from sliding out from the lower joint 2.

[0027] As shown in the figure, Figures 1-4As shown, the upper joint 1 and the inner cylinder 31 are fixedly connected inside the outer cylinder 3, and there is a gap between the end portions of the upper joint 1 and the inner cylinder 31, the inner cylinder 31 is provided with an elastic ball seat 33 in the gap, the elastic ball seat 33 includes a plurality of arc-shaped elastic sheets 331, the arc-shaped elastic sheets 331 are made of metal and have elasticity, and the present scheme is preferably four sections, the first and last ends of the four arc-shaped elastic sheets 331 are respectively provided with grooves 3311 and protrusions 3312, the grooves 3311 and the protrusions 3312 are all provided in a wedge shape, the protrusions 3312 are used to be embedded in the grooves 3311 of another arc-shaped elastic sheet 331, and the length of the protrusion 3312 is less than the depth of the groove 3311, so as to facilitate greater elastic space when the elastic ball seat 33 is compressed and shrunk, so that the elastic ball seat 33 connected at the first and last ends and forming a ring, the arc-shaped elastic sheet 331 naturally expands when not under pressure, and the curvature radius after expansion is greater than that in the outer cylinder 3; preferably, the outer circle of the arc-shaped elastic sheet 331 in the embodiment is provided with a clamping groove (not shown in the figure), after the plurality of arc-shaped elastic sheets 331 are connected at the first and last ends and form the elastic ball seat 33, the clamping grooves of the plurality of arc-shaped elastic sheets 331 are connected, and a clamping spring is embedded in the clamping groove of the elastic ball seat 33, the clamping spring plays a fastening role on the plurality of arc-shaped elastic sheets 331, prevents the elastic ball seat 33 from expanding at the expansion groove 34, and ensures that the plurality of arc-shaped elastic sheets 331 are not loose and can still be connected.

[0028] The end portion of the upper joint 1 limits the elastic ball seat 33 from floating upward when the environment changes, and the outer wall of the elastic ball seat 33 abuts against the inner wall of the outer cylinder 3, at this time the inner diameter of the elastic ball seat 33 is less than the diameter of the ball 4, the inner wall of the outer cylinder 3 is provided with an expansion groove 34 in the circumferential direction, the expansion groove 34 is used for embedding the elastic ball seat 33, the thickness of the arc-shaped elastic sheet 331 is greater than the length difference between the inner diameter of the expansion groove 34 and the inner diameter of the outer cylinder 3, that is, the thickness of the arc-shaped elastic sheet 331 is greater than the depth of the expansion groove 34, the inner diameter of the elastic ball seat 33 after being embedded in the expansion groove 34 is greater than the inner diameter of the ball 4, and the inner diameters of the upper joint 1 and the inner cylinder 31 are equal, so that the ball 4 can pass through.

[0029] The working principle is as follows: the ball 4 is thrown into the well completion casing, liquid is injected into the wellbore at high pressure, the liquid drives the ball 4 to impact downward, when the ball 4 falls into the cementing sliding sleeve, the ball 4 contacts the elastic ball seat 33, the shear pin 351 is sheared under the high pressure of the liquid, the ball 4 moves downward and drives the inner cylinder 31 to slide downward, the inner cylinder 31 does not block the communication hole 32 during the sliding process, at this time the outer cylinder 3 is connected with the outside through the communication hole, the ball 4 continues to press the elastic ball seat 33 to slide downward, when the elastic ball seat 33 slides to the expansion groove 34, the elastic ball seat 33 is embedded in the expansion groove 34 and expands, so that the outer circle of the elastic ball seat 33 abuts against the inner circle of the expansion groove 34, at this time the inner diameter of the elastic ball seat 33 is greater than the diameter of the ball 4, the ball 4 falls downward and enters the next cementing sliding sleeve, and the operation is repeated.

[0030] The above only is the embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be pointed out that, for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A ball-jet type cementing and fracturing sliding sleeve, comprising an upper joint and a lower joint, an outer cylinder is connected between the upper joint and the lower joint, an inner cylinder is connected in the outer cylinder, characterized in that: The cylinder wall of the outer cylinder is provided with a plurality of communication holes, the communication holes penetrate the cylinder wall of the outer cylinder, the outer circle of the inner cylinder is tangent to the inner circle of the outer cylinder, the outer circle of the inner cylinder blocks the communication holes, the elastic ball seat is arranged close to the upper joint of the outer cylinder, the outer circle of the elastic ball seat abuts against the inner circle of the outer cylinder, the end of the elastic ball seat away from the upper joint abuts against the end of the inner cylinder, at this time, the inner diameter of the inner circle of the elastic ball seat is smaller than the diameter of the ball, the elastic ball seat is used for receiving the ball and pressing down the inner cylinder under the action of the ball, so that the inner cylinder slides in the outer cylinder to the direction of the lower joint, the cylinder wall of the inner circle of the outer cylinder is provided with an expansion groove in the circumferential direction, the communication holes are located between the expansion groove and the end of the outer cylinder close to the upper joint, the expansion groove is used for embedding the elastic ball seat, at this time, the inner diameter of the inner circle of the elastic ball seat is greater than the diameter of the ball.

2. The ball-jet set fracturing sliding sleeve of claim 1, wherein: The cylinder wall of the outer cylinder is provided with a plurality of threaded holes, the threaded holes penetrate the cylinder wall of the outer cylinder, the cylinder wall of the inner cylinder is provided with a plurality of connecting holes corresponding to the threaded holes, the threaded holes are connected with shear pins, the shear pins are connected with the threaded holes, and the end of the shear pin is embedded in the connecting hole.

3. The ball-jet set fracturing sliding sleeve of claim 2, wherein: The elastic ball seat comprises a plurality of arc-shaped elastic pieces which are clamped with each other, and the thickness of the arc-shaped elastic piece is greater than the inner diameter difference between the expansion groove and the outer cylinder.

4. The ball-jet set fracturing sliding sleeve of claim 3, wherein: The upper joint is sleeved in the outer cylinder and fixedly connected with the outer cylinder, the inner diameter of the upper joint is equal to the outer diameter of the inner cylinder, so as to facilitate the falling of the ball.

5. The ball-jet set fracturing sliding sleeve of claim 4, wherein: The elastic ball seat is located between the ends of the inner cylinder and the upper joint which are close to each other.

6. The ball-jet set fracturing sliding sleeve of claim 5, wherein: The lower joint comprises a lower cylinder body and a lower connecting cylinder which are integrally formed, the lower connecting cylinder is sleeved in the end of the outer cylinder and fixedly connected with the outer cylinder, the inner diameter of the lower connecting cylinder is equal to the inner diameter of the outer cylinder, so as to facilitate the sliding of the inner cylinder, and the inner diameter of the lower cylinder body is smaller than the outer diameter of the inner cylinder, so as to prevent the inner cylinder from sliding out.

7. The ball-jet set fracturing sliding sleeve of claim 6, wherein: The inner circles of the two ends of the outer cylinder are concave, so as to facilitate the embedding and connection of the upper joint and the lower connecting cylinder, the upper joint and the lower connecting cylinder are fixedly connected with the outer cylinder through threads, and the outer circles of the ends of the upper joint and the lower connecting cylinder close to the end of the outer cylinder are provided with shoulder grooves in the circumferential direction, the shoulder grooves are used for embedding the outer cylinder.

8. The ball-jet set fracturing sliding sleeve of claim 7, wherein: The arc-shaped elastic pieces are respectively provided with grooves and protrusions at the two ends, and the protrusions and the grooves of the plurality of arc-shaped elastic pieces are connected in a ring.

Images