CN112664162A

CN112664162A - Intubation type well cementation valve

Info

Publication number: CN112664162A
Application number: CN201910981391.2A
Authority: CN
Inventors: 全家正; 何峻宇; 支林; 范青; 袁可; 彭德忠; 谭胜伦; 何小平; 韦志晶; 彭琳; 唐海波; 陈永洪
Original assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Southwest Oil and Gas Co
Priority date: 2019-10-16
Filing date: 2019-10-16
Publication date: 2021-04-16

Abstract

The invention discloses an intubation type well cementation valve which comprises an outer tube assembly and a sliding sleeve, wherein the sliding sleeve is assembled in the outer tube assembly in an axial sliding displacement mode, at least one group of flow guide structures capable of being switched on/off through the axial sliding displacement of the sliding sleeve are arranged between the outer tube assembly and the sliding sleeve, at least one group of clamping structures capable of clamping/releasing limiting through the axial sliding displacement of the sliding sleeve are arranged between the outer tube assembly and the sliding sleeve, and when the limiting state is clamped in the outer tube assembly through the sliding sleeve, the flow guide structures between the sliding sleeve and the outer tube assembly are in a switching-off state. The invention can effectively prevent the closed cement slurry injection channel from automatically re-opening under the condition of non-operation requirement, and ensure the smooth and correct implementation of the well cementation operation.

Description

Intubation type well cementation valve

Technical Field

The invention relates to a tool for well cementation operation, in particular to an insertion pipe type well cementation valve.

Background

The well cementation operation is an indispensable important link in the well drilling and completion operation process, the main operation process comprises casing running, cement injection and the like, and the main technical purpose is to protect and support the casing in the oil-gas well, seal an oil layer, a gas layer, a water layer and the like in a well bore and achieve the effects of prolonging the service life of the oil-gas well and improving the oil-gas yield.

The well cementation valve is one of important tools for well cementation operation and has the function of controlling the on/off state of a cement slurry injection channel in a well so as to realize effective control on the cement slurry injected in the well. At present, a common well cementation valve is an insertion pipe type well cementation valve, and specific structures of the common well cementation valve can be referred to technologies such as an insertion pipe well cementation valve (publication number CN 204716202, published 2015, 10 and 21 days) or a sliding sleeve switch type well cementation device (publication number CN 205477533, published 2016, 08 and 17 days) disclosed in chinese patent documents. Now, the two aforementioned techniques are combined to make the following specific description for the presently common intubating cementing valve.

The cannula type well cementation valve is provided with an outer pipe assembly and a sliding sleeve. The outer pipe assembly mainly comprises an upper joint, a middle joint and a lower joint which are sequentially butted from top to bottom. The middle joint is a blind hole structure pipe fitting with a closed bottom end, the lower joint is hermetically connected to the outer side of the middle part of the middle joint, the middle lower part of the middle joint axially extends into the lower joint, a flow guide annulus is formed between the outer wall of the middle lower part of the middle joint and the inner wall of the lower joint, and a plurality of flow guide holes which are circumferentially distributed are radially formed in the middle joint at the flow guide annulus (for convenience of description and confusion, the flow guide holes are defined as static side flow guide holes). In order to facilitate the pressure test operation of sealing detection on a well cementation tubular column before well cementation operation, the inner wall of the lower connector at the lower part of the bottom end of the middle connector is connected with a ball seat through assemblies such as a sealing ring and a shearing pin, the part of the ball seat connected with the lower connector is of a reducing stepped hole structure, a plurality of slurry discharge holes distributed circumferentially are radially formed in the lower connector below the ball seat, and a valve ball body is arranged on the ball seat.

The sliding sleeve is assembled in the blind hole structure inner hole that middle joint and top connection are constituteed with the mode that can the axial sliding displacement, the lower part position radially has seted up a plurality of water conservancy diversion holes that are circumferential direction and distribute (for convenience of description, do not obscure, it is the water conservancy diversion hole of moving side to define it), the water conservancy diversion hole of moving side on the sliding sleeve is the one-to-one relation with the quiet side water conservancy diversion hole on the middle joint in the circumferencial direction, and can radially coincide between the water conservancy diversion hole of one-to-one relation in the intussusception activity of sliding sleeve and middle joint, in other words, set up the water conservancy diversion structure that the multiunit can switch on/cut off through the axial. In order to ensure the sealing performance, sealing rings which can be in contact sealing with the inner wall of the middle joint are arranged on the outer walls of the sliding sleeves at the upper and lower parts of the movable side diversion hole. The upper joint is internally and hermetically provided with a pressing sleeve positioned above the sliding sleeve.

When the well cementation valve with the structure is in an initial state, a movable side flow guide hole in the sliding sleeve and a static side flow guide hole in the middle joint are in a staggered state (namely, the flow guide structure is in a cut-off state), the movable side flow guide hole is positioned above the static side flow guide hole, the static side flow guide hole in the middle joint is plugged at the lower part of the sliding sleeve, a sliding displacement space is formed between the lower end of the sliding sleeve and the bottom of a blind hole of the middle joint, and the lower end of the sliding sleeve is limited by a shear pin fixed on the inner wall of the middle joint at the position below the static side flow guide hole; certainly, in order to guarantee the leakproofness, be provided with the sealing washer between the middle joint inner wall below sliding sleeve lower part and quiet side water conservancy diversion hole.

When the well cementation valve with the structure performs grouting operation, a grouting pipeline is inserted into the sliding sleeve through the pressing sleeve to force the sliding sleeve to cut off the shearing pin with the limiting effect at the lower end to move downwards, the sliding sleeve enables the flow guide structures to be conducted in the downward displacement process (namely the dynamic side flow guide holes and the static side flow guide holes which correspond one to one are superposed), namely the cement slurry injection channel is conducted, and the cement slurry is injected into the flow guide annulus through the flow guide structures and enters the well.

When the grouting operation is completed or needs to be stopped, the cement slurry injected into the well needs to be closed to avoid the situation that the cement slurry flows backwards to influence the correct implementation of the well cementation operation. At the moment, the slip sleeve is driven to move upwards to reset by lifting the grouting pipeline, so that the flow guide structures are cut off (namely the movable side flow guide holes and the static side flow guide holes which correspond one to one are staggered), and the cement slurry injection channel is closed.

In the structure of the well cementation valve, the sliding sleeve which is reset upwards is temporarily limited and fixed by lifting the grouting pipeline, once the grouting pipeline is unstably contacted with the sliding sleeve or the grouting pipeline is lifted from the well cementation valve according to the operation requirement, the sliding sleeve loses the limiting structure and generates downward sliding displacement under the action of gravity, and the downward displacement of the sliding sleeve can enable each flow guide structure between the sliding sleeve and the middle joint to be conducted again, namely a cement slurry injection channel is opened again, so that cement slurry which is injected into the well flows backwards to cause well cementation accidents.

It follows that there is a great need for technical improvements to the above-described cannulated cementing valve.

Disclosure of Invention

The technical purpose of the invention is as follows: aiming at the particularity of the intubating well cementation valve and the defects of the prior art, the intubating well cementation valve can effectively prevent a closed cement slurry injection channel from automatically reopening under the condition of no operation requirement.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides an intubate formula well cementation valve, includes outer tube subassembly and sliding sleeve, the sliding sleeve is in with the mode assembly that can the endwise slip displacement in the outer tube subassembly, the outer tube subassembly with be provided with at least a set of between the sliding sleeve and pass through the endwise slip displacement of sliding sleeve and the water conservancy diversion structure that switches on/cuts off, the outer tube subassembly with be provided with at least a set of between the sliding sleeve and pass through the endwise slip displacement of sliding sleeve and block spacing/remove spacing joint structure, the sliding sleeve is in when the outer tube subassembly blocks spacing state, the sliding sleeve with water conservancy diversion structure between the outer tube subassembly is in the off-state.

As one of the preferred schemes, the joint structure mainly by the quiet side joint groove of seting up of indent on the outer tube assembly internal face with the moving side joint groove of seting up of indent on the sliding sleeve outer wall face constitutes, quiet side joint inslot is equipped with through ejecting elastic element and can pops out the joint plush head in quiet side joint groove, the sliding sleeve slides the displacement to move side joint groove corresponding to when the quiet side joint groove on the outer tube assembly, the joint plush head embedding of popping out in the quiet side joint inslot moves the inboard joint inslot. Furthermore, when the clamping raised head of the clamping structure is embedded into the movable side clamping groove on the sliding sleeve, the rear part of the clamping raised head is embedded into the static side clamping groove on the outer pipe assembly. Furthermore, the outer edge of the clamping raised head is matched with the movable side clamping groove on the sliding sleeve in a curved surface structure.

Preferably, the clamping structure is located above the flow guide structure.

As one of the preferable schemes, a blind hole structure is arranged in the outer tube assembly, the sliding sleeve is assembled in the blind hole structure of the outer tube assembly in an axial sliding displacement mode, an elastic lifting structure is arranged between the bottom of the blind hole structure in the outer tube assembly and the bottom end of the sliding sleeve, and the lifting structure is positioned below the flow guide structure. Furthermore, the lifting structure mainly comprises a lifting support plate and a lifting elastic element, wherein the lifting support plate is lined at the bottom end of the sliding sleeve and assembled in the blind hole structure of the outer tube assembly in an axial sliding displacement mode, and the lifting elastic element is assembled between the lifting support plate and the bottom of the blind hole structure in the outer tube assembly. And the outer edge of the lifting supporting plate is provided with a sealing ring which can be in sealing contact with the inner wall of the outer pipe assembly. Furthermore, a bearing seat protruding upwards is arranged at the bottom of the blind hole structure at the lifting structure, and the protruding height of the bearing seat is lower than that of the lifting structure; in an initial state, the distance between the bearing seat and the lifting supporting plate of the lifting structure corresponds to the dislocation distance of the flow guide structure between the outer pipe assembly and the sliding sleeve when the flow guide structure is cut off. Furthermore, the bottom of the lifting supporting plate of the lifting structure is provided with a guide column which protrudes downwards, and the guide column and the bearing seat are in telescopic fit in the contraction process of the lifting structure.

The beneficial technical effects of the invention are as follows:

1. on the basis of the existing intubation type well cementation valve, a clamping structure which can clamp/release the limit by the axial sliding displacement of the sliding sleeve is arranged between the outer pipe assembly and the sliding sleeve so as to ensure that a flow guide structure between the sliding sleeve and the outer pipe assembly is in a cut-off state when the sliding sleeve is in a clamping limit state in the outer pipe assembly, so that even if the contact between a grouting pipeline and the sliding sleeve is unstable or the grouting pipeline is withdrawn from the well cementation valve according to the operation requirement, the reset sliding sleeve cannot automatically slide and displace, the closed cement slurry injection channel is effectively prevented from automatically re-opening in a state which is not required by the operation, and the well cementation operation is ensured to be smoothly and correctly implemented;

2. when the clamping structure reliably clamps and limits the sliding sleeve in sliding displacement, the damage of the sliding displacement of the sliding sleeve to the clamping structure when the limiting state is released can be effectively avoided, and the stability is good;

3. the clamping structure is arranged above the flow guide structure, so that the sliding displacement of the sliding sleeve can be reliably controlled, and the on/off state of the flow guide structure can be effectively and reliably controlled;

4. the lifting structure of the invention can not interfere the on/off state of the flow guide structure, but can release elasticity to effectively lift the sliding sleeve when the sliding sleeve is reset so as to assist the grouting pipeline to force the sliding sleeve to slide and displace; due to the existence of the lifting structure, even if unstable contact factors exist between the sliding sleeve and the grouting pipeline, the resetting of the sliding sleeve cannot be influenced, so that the closed cement slurry injection channel can be further effectively prevented from being automatically re-opened in a non-operation-required state, and the well cementation operation is ensured to be smoothly and correctly implemented;

5. the lifting structure can enable the end part of the sliding sleeve to uniformly bear the lifting force in the circumferential direction so as to ensure that the sliding sleeve can stably and reliably perform sliding displacement; in addition, the sealing ring at the outer edge of the lifting supporting plate can further improve the sealing property between the outer pipe assembly and the sliding sleeve, prevent cement slurry from permeating into the lifting structure, and ensure long-term and stable operation of the lifting structure;

6. the bearing seat structure at the lifting structure can limit the position of the lifting supporting plate which slides downwards to move, so that the sliding sleeve can slide downwards to move, and thus, the static side flow guide hole on the outer pipe assembly and the movable side flow guide hole on the sliding sleeve can be effectively set to be quickly and effectively communicated, and the effective control of the flow guide structure is facilitated;

7. the telescopic matching guide structure between the lifting support plate and the lower bearing seat of the lifting structure can ensure the reliability and stability of the sliding sleeve during sliding displacement.

Drawings

FIG. 1 is a schematic diagram of a structure of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 1.

Fig. 4 is an enlarged view of a portion C of fig. 1.

The reference numbers in the figures mean: 1-upper joint; 2-middle joint; 3-lower joint; 4-ball seat; 5-valve ball body; 6, slurry discharging holes; 7-diversion annulus; 8-static side flow guide holes; 9-a static side clamping groove; 10-a limiting groove; 11-a sliding sleeve; 12-moving side diversion holes; 13-lifting the supporting plate; 14-lifting the elastic element; 15-bearing seat; 16-a guide post; 17-clamping a raised head; 18-pressing sleeve; 19-a limiting part; 20-ejecting the elastic element; 21-movable side clamping groove.

Detailed Description

The invention relates to a tool for well cementing operation, in particular to an insert pipe type well cementing valve, and the main technical content of the invention is explained in detail by a plurality of embodiments. In embodiment 1, the technical contents of the present invention are clearly and specifically explained with reference to the drawings in the specification, i.e., fig. 1, fig. 2, fig. 3, and fig. 4, and although the drawings are not separately drawn in other embodiments, the main structures of the other embodiments can still refer to the drawings of embodiment 1.

It is expressly noted here that the drawings of the present invention are schematic and have been simplified in unnecessary detail for the purpose of clarity and to avoid obscuring the technical solutions that the present invention contributes to the prior art.

Example 1

Referring to fig. 1 to 4, the present invention includes an outer tube assembly and a sliding sleeve 11.

The outer pipe assembly mainly comprises an upper joint 1, a middle joint 2 and a lower joint 3 which are sequentially butted from top to bottom. Specifically, the inner side of the lower end of the upper joint 1 is connected with the outer side of the upper end of the middle joint 2 through a thread structure; the upper end of the inner hole of the upper joint 1 is provided with a concave limiting groove 10, because the inner holes of the upper joint 1 and the middle joint 2 are used as an axial assembling pressing sleeve 18, and in order to control the axial displacement of the pressing sleeve 18, the upper end of the inner hole of the upper joint 1 is provided with the limiting groove 10 with larger inner diameter, and correspondingly, the pressing sleeve 18 assembled therein is provided with a limiting part 19 with larger outer diameter. The middle joint 2 is a blind hole structure pipe with a closed bottom end, the outer side of the middle part of the middle joint 2 is connected with the inner side of the upper end of the lower joint 3 through a thread structure, in order to ensure the sealing property, a plurality of sealing rings are arranged at the joint of the middle joint and the lower joint, namely, the upper end of the lower joint 3 is hermetically connected with the outer side of the middle part of the middle joint 2, the part below the middle part of the middle joint 2 axially extends into the lower joint 3, the part below the middle part of the middle joint 2 is of a reducing step structure, so that an annular space gap is formed between the outer wall of the middle lower part of the middle joint 2 and the inner wall of the lower joint 3, and the annular space; two static side diversion holes 8 are radially formed in the middle joint 2 corresponding to the upper portion of the diversion annular space, and the two static side diversion holes 8 are symmetrically distributed in the circumferential direction of the middle joint 2. In order to facilitate the pressure test operation of sealing detection on a well cementation tubular column before well cementation operation, a ball seat 4 is connected to the inner wall of a lower joint 3 at the lower part of the bottom end of a middle joint 2 through components such as a sealing ring and a shearing pin, the part of the lower joint 3, which is connected with the ball seat 4, is of a reducing stepped hole structure, and four circumferentially distributed slurry discharge holes 6 are radially formed in the lower joint 3 below the ball seat 4; the upper end of the inner hole of the ball seat 4 is of an inclined plane structure, a valve ball body 5 is arranged on the inclined plane structure at the upper end of the inner hole of the ball seat 4, and a movable gap is kept between the valve ball body 5 arranged in place and the bottom end of the middle joint 2.

The sliding sleeve 11 is assembled in the inner hole of the blind hole structure formed by the middle joint 2 and the upper joint 1 in a manner of axial sliding displacement. A pressing sleeve 18 is also assembled in the inner hole formed by the middle joint 2 and the upper joint 1 above the sliding sleeve 11, a plurality of sealing rings which are in sealing contact with the inner hole of the upper joint 1 and/or the middle joint 2 are arranged on the outer wall of the pressing sleeve 18, and as mentioned above, the upper end of the pressing sleeve 18 is provided with a limiting part 19 of which the outer diameter is larger than the inner hole of the upper joint 1 and is smaller than the limiting groove 10 at the upper end of the inner hole of the upper joint 1. The inner hole formed by the pressing sleeve 18 and the sliding sleeve 11 is used for filling a grouting pipeline. Two dynamic side diversion holes 12 are radially arranged at the middle lower part of the sliding sleeve 11, the two dynamic side diversion holes 12 are symmetrically distributed in the circumferential direction of the sliding sleeve 11, and is in one-to-one correspondence with the two static side diversion holes 8 on the middle joint 2 in the circumferential direction, namely, one movable side diversion hole 12 corresponds to one static side diversion hole 8, in the corresponding relation, the axial sliding displacement of the sliding sleeve 11 in the middle joint 2 (namely the nesting movement between the sliding sleeve 11 and the middle joint 2) can lead the movable side diversion hole 12 and the static side diversion hole 8 in one-to-one correspondence to be radially superposed, after the radial superposition, the diversion structures between the movable side diversion hole 12 and the static side diversion hole 8 are conducted, the non-radial superposition forms dislocation, and the diversion structures are cut off when the dislocation occurs, therefore, two groups of flow guide structures which can be switched on/off through the axial sliding displacement of the sliding sleeve 11 are arranged between the sliding sleeve 11 and the middle joint 2. In order to ensure the sealing performance, a plurality of sealing rings which can be in contact sealing with the inner wall of the middle joint 2 are respectively arranged on the outer walls of the sliding sleeve 11 at the upper and lower positions of the movable side diversion hole 12.

The well cementation valve with the structure is characterized in that in actual use: in the initial state, the position of the dynamic side diversion hole 12 on the sliding sleeve 11 is higher than the position of the corresponding static side diversion hole 8 on the middle joint 2; when the flow guide structure between the sliding sleeve 11 and the middle joint 2 needs to be communicated, the sliding sleeve 11 axially moves downwards in the inner hole of the middle joint 2, and the corresponding movable side flow guide hole 12 and the corresponding static side flow guide hole 8 radially coincide to realize the communication; when the conducted diversion structure between the sliding sleeve 11 and the middle joint 2 needs to be cut off, the sliding sleeve 11 moves upwards in the inner hole of the middle joint 2, so that the corresponding movable side diversion hole 12 and the static side diversion hole 8 are in a staggered state, and the cutting off is realized.

The valve with the structure is provided with a clamping structure for limiting and controlling the axial displacement of the sliding sleeve.

Specifically, two static side clamping grooves 9 are concavely formed in the upper part of an inner hole of the middle joint 2, and the two static side clamping grooves 9 are symmetrically distributed in the circumferential direction of the middle joint 2; each stationary side engaging groove 9 is connected with an engaging protrusion 17 through a plurality of elastic ejection elements 20 (preferably springs), and the engaging protrusion 17 can be ejected out of the stationary side engaging groove 9 under the action of the elastic ejection elements 20. Correspondingly, the upper part of the outer wall of the sliding sleeve 11 is also provided with two movable side clamping grooves 21 in an inwards concave manner, the two movable side clamping grooves 21 are symmetrically distributed in the circumferential direction of the sliding sleeve 11 and are in one-to-one correspondence with the two static side clamping grooves 9 on the middle joint 2 in the circumferential direction, namely, one movable side clamping groove 21 corresponds to one static side clamping groove 9.

In the corresponding relation, the axial sliding displacement of the sliding sleeve 11 in the middle joint 2 can lead the movable side clamping groove 21 and the static side clamping groove 9 in the one-to-one corresponding relation to be radially superposed, at the moment, the clamping raised head 17 popped out from the static side clamping groove 9 on the middle joint 2 can be embedded into the movable side clamping groove 21 on the sliding sleeve 11, the sliding sleeve 11 is clamped and limited in the middle joint 2, the position of the sliding sleeve 11 clamped and limited in the middle joint 2 is actually the initial state of the valve, the flow guiding structure between the sliding sleeve 11 and the middle joint 2 is in a cut-off state at the moment, more specifically, the position of the movable side flow guiding hole 12 on the sliding sleeve 11 is higher than the position of the static side flow guiding hole 8 on the middle joint 2, the two are staggered in the radial direction, the static side flow guiding hole 8 on the middle joint 2 is blocked by the lower part of the, in order to ensure the sealing property, a sealing ring is arranged between the lower part of the sliding sleeve 11 and the inner wall of the middle joint 2 below the static side diversion hole 8.

Therefore, the clamping structure on the valve mainly comprises a static side clamping groove 9 which is formed in the inner wall surface of the middle joint 2 in an inwards concave mode and a movable side clamping groove 21 which is formed in the outer wall surface of the sliding sleeve 11 in an inwards concave mode, an elastic limiting clamping tongue is assembled in the static side clamping groove 9, and when the sliding sleeve 11 slides and moves to the movable side clamping groove 21 and corresponds to the static side clamping groove 9 on the middle joint 2, the elastic clamping tongue in the static side clamping groove 9 can be embedded into the movable side clamping groove 21 to limit the displacement of the sliding sleeve 11.

In order to ensure the stability of the operation of the clamping structure, the depth of the movable side clamping groove 21 on the sliding sleeve 11 is required to be smaller than the thickness of the clamping raised head 17, and when the clamping structure is triggered to enable the clamping raised head 17 to be embedded into the movable side clamping groove 21 on the sliding sleeve 11, the rear part of the clamping raised head 17 is embedded into the static side clamping groove 9 on the middle connector 2. Therefore, when the sliding sleeve 11 is displaced downwards under the action of external force to release the limit, the downward displacement force of the sliding sleeve 11 can force the clamping raised head 17 to effectively retreat into the static side clamping groove 9 on the middle connector 2, so that the clamping raised head 17 is not taken away to damage the ejection elastic element 20. Of course, in order to improve the smoothness of the stopper release, it is conceivable to fit the outer edge of the engaging projection 17 to the movable engaging groove 21 of the slide bush 11 in a curved structure such as a rounded corner.

In addition, in order to ensure that the sliding sleeve in the valve with the structure can be reliably reset upwards after going downwards, the valve with the structure is also provided with a lifting structure which moves the sliding sleeve upwards in the axial direction and pushes the sliding sleeve.

Specifically, a lifting elastic element 14 and a lifting support plate 13 are arranged between the bottom of the blind hole structure of the middle joint 2 and the bottom end of the sliding sleeve 11. The bottom end of a lifting elastic element 14 (preferably a spring) is seated on the bottom surface of the blind hole structure of the middle joint 2, the top end of the lifting elastic element abuts against the bottom surface of the lifting supporting plate 13, and the outer diameter of the lifting elastic element 14 is slightly smaller than the inner hole of the middle joint 2 and is similar to the outer diameter of the sliding sleeve 11. The lifting supporting plate 13 is of a plate-shaped structure, the bottom end of the sliding sleeve 11 is lined with the top surface of the lifting supporting plate, and the outer diameter of the lifting supporting plate 13 is slightly smaller than the inner hole of the middle joint 2 and is similar to the outer diameter of the sliding sleeve 11; the outer edge of the lifting supporting plate 13 is provided with a sealing ring which can be in sealing contact with the inner wall of the inner hole of the middle joint 2, and the lifting supporting plate 13 is assembled in the inner hole of the middle joint 2 below the sliding sleeve 11 in an axial sliding displacement mode. In the lifting structure, under the action of external force pressing, the downward force of the sliding sleeve 11 acts on the lifting support plate 13, the lifting support plate 13 moves downward to compress the lifting elastic element 14, and after the external force pressing action is lost, the lifting elastic element 14 releases the elastic force to force the lifting support plate 13 to move upward to lift the sliding sleeve 11, so that the lifting function is performed on the sliding sleeve 11; in this way, the height of the lifting structure formed in the middle joint 2 should not exceed the flow guiding structure, i.e. the maximum height of the lifting structure is lower than the position of the static side flow guiding hole 8 on the middle joint 2 and is below the flow guiding structure.

In order to ensure that the descending sliding sleeve 11 can be quickly and accurately communicated with the middle joint 2, the bearing seat 15 which protrudes upwards is arranged on the bottom surface of the blind hole structure of the middle joint 2, and the bearing seat 15 is arranged at the center of the lifting structure. The forming structure of the bearing seat 15 has two basic requirements, one of which is that the height of the bulge of the bearing seat 15 is required to be lower than that of the lifting structure, so that the action of the lifting structure cannot be influenced; secondly, the matching relationship between the bearing seat 15 and the lifting support plate 13 is required to be matched with the matching relationship between the movable side guide flow hole 12 and the fixed side guide flow hole 8, and more specifically, in the initial state of the valve, the distance between the top end of the bearing seat 15 and the lifting support plate 13 of the lifting structure corresponds to the dislocation distance between the fixed side guide flow hole 8 on the middle joint 2 and the movable side guide flow hole 12 on the sliding sleeve 11 during cutting off.

In addition, in order to make the lifting structure operate better and make the bearing seat 15 and the lifting structure form better matching, the bearing seat 15 is a hollow structure with an opening at the upper end, namely an inner hole with a blind hole structure; correspondingly, the central position of the bottom of the lifting splint 13 is provided with a guide post 16 protruding downwards, the guide post 16 is corresponding and consistent with the inner hole of the bearing seat 15 in the axial direction, and the outer diameter of the guide post 16 is slightly smaller than the inner hole of the bearing seat 15, so that the guide post 16 at the bottom of the lifting splint 13 can be inserted into the bearing seat 15 and is in telescopic fit with the bearing seat 5 in the compression process of the lifting structure.

Example 2

The invention includes an outer tube assembly and a sliding sleeve.

The outer pipe assembly mainly comprises an upper joint, a middle joint and a lower joint which are sequentially butted from top to bottom. Specifically, the inner side of the lower end of the upper joint is connected with the outer side of the upper end of the middle joint through a thread structure; the upper end of the inner hole of the upper joint is provided with a concave limiting groove, because the inner holes of the upper joint and the middle joint are used as axial assembling press sleeves, and in order to control the axial displacement of the press sleeves, the upper end of the inner hole of the upper joint is provided with a limiting groove with larger inner diameter, and correspondingly, the press sleeves assembled in the upper joint are provided with a limiting part with larger outer diameter. The middle joint is a blind hole structure pipe with a closed bottom end, the outer side of the middle part of the middle joint is connected with the inner side of the upper end of the lower joint in a threaded structure, and in order to ensure the sealing property, a plurality of sealing rings are arranged at the joint of the middle joint and the lower joint, namely, the upper end of the lower joint is hermetically connected with the outer side of the middle part of the middle joint, the part below the middle part of the middle joint axially extends into the lower joint, the part below the middle part of the middle joint is of a reducing step structure, so that an annular space is formed between the outer wall of the middle lower part of the middle joint and the inner wall of the lower joint, and the annular space; four static side diversion holes are radially formed in the middle joint corresponding to the upper portion of the diversion annular space, and the four static side diversion holes are uniformly distributed in the circumferential direction of the middle joint. In order to facilitate pressure test operation of sealing detection on a well cementation tubular column before well cementation operation, a ball seat is connected to the inner wall of a lower joint below the bottom end of a middle joint through components such as a sealing ring and a shearing pin, the part of the lower joint, which is connected with the ball seat, is of a reducing stepped hole structure, and four circumferentially distributed slurry discharge holes are radially formed in the lower joint below the ball seat; the upper end of the inner hole of the ball seat is of an inclined plane structure, a valve ball body is arranged on the inclined plane structure at the upper end of the inner hole of the ball seat, and a movable gap is kept between the valve ball body arranged in place and the bottom end of the middle joint.

The sliding sleeve is assembled in a blind hole structure inner hole formed by the middle joint and the upper joint in a mode of axial sliding displacement. The inner hole formed by the middle joint and the upper joint above the sliding sleeve is also internally provided with a pressing sleeve, the outer wall of the pressing sleeve is provided with a plurality of sealing rings which are in sealing contact with the inner hole of the upper joint and/or the middle joint, and the upper end of the pressing sleeve is provided with a limiting part of which the outer diameter is larger than the inner hole of the upper joint but smaller than a limiting groove at the upper end of the inner hole of the upper joint. The inner hole formed by the pressing sleeve and the sliding sleeve is used for filling a grouting pipeline. The middle lower part position of sliding sleeve has radially seted up four and has moved side water conservancy diversion holes, these four move side water conservancy diversion holes are evenly distributed in the circumference of sliding sleeve, and with four quiet side water conservancy diversion holes on the above-mentioned well joint be the one-to-one correspondence in the circumference, move side water conservancy diversion hole and correspond a quiet side water conservancy diversion hole promptly, in this correspondence, the axial sliding displacement (the intussusception activity between sliding sleeve and the well joint promptly) in the sliding sleeve well joint can make between the side water conservancy diversion hole that moves of one-to-one correspondence and the quiet side water conservancy diversion hole radially coincide, water conservancy diversion structure between them switches on after radial heavy, non-radial coincidence has just formed the dislocation, their water conservancy diversion structure cuts off during the dislocation.

Therefore, four groups of flow guide structures which can be switched on/off through the axial sliding displacement of the sliding sleeve are arranged between the sliding sleeve and the middle joint. In order to ensure the sealing property, a plurality of sealing rings which can be in contact sealing with the inner wall of the middle joint are respectively arranged on the outer walls of the sliding sleeves at the upper and lower positions of the movable side diversion hole.

The well cementation valve with the structure is characterized in that in actual use: in the initial state, the position of the dynamic side diversion hole on the sliding sleeve is higher than the position of the corresponding static side diversion hole on the middle joint; when the flow guide structure between the sliding sleeve and the middle joint needs to be communicated, the sliding sleeve axially descends in the inner hole of the middle joint, and the corresponding movable side flow guide hole and the corresponding static side flow guide hole are radially superposed to realize the communication; when the conducted flow guide structure between the sliding sleeve and the middle joint needs to be cut off, the sliding sleeve moves upwards in the inner hole of the middle joint, so that the corresponding movable side flow guide hole and the corresponding static side flow guide hole are in a staggered state, and the cutting-off is realized.

Specifically, three static side clamping grooves are concavely formed in the upper part of an inner hole of the middle joint and are uniformly distributed in the circumferential direction of the middle joint; each static side clamping groove is internally connected with a clamping raised head through a plurality of ejection elastic elements (preferably springs), and the clamping raised heads can be ejected out of the static side clamping grooves under the action of the ejection elastic elements. Corresponding to it, also the indent has seted up three side joint groove of moving in sliding sleeve outer wall upper portion position, and these three side joint groove of moving is evenly distributed in the circumference of sliding sleeve, and is the one-to-one relation with three quiet side joint groove on the aforesaid well joint in the circumference, and a side joint groove of moving corresponds a quiet side joint groove promptly.

In this corresponding relation, the sliding sleeve can make between the movable side joint groove and the quiet side joint groove of one-to-one correspondence in the axial slip displacement of adapter, the joint plush head that pops out in the quiet side joint inslot on the adapter can imbed the movable side joint inslot on the sliding sleeve this moment, it is spacing to block in the adapter with the sliding sleeve, the initial condition that is the valve in the position of being blocked spacing sliding sleeve in the adapter really, the water conservancy diversion structure between sliding sleeve and the adapter at this moment is in the off-state, and is more specific, the position in the movable side water conservancy diversion hole on the sliding sleeve is higher than the position in the quiet side water conservancy diversion hole on the adapter, the two is radially misplaced, the lower part of sliding sleeve is with the shutoff of the quiet side water conservancy diversion hole on the adapter, in order to guarantee the leakproofness, be provided with the sealing washer between the adapter inner wall of sliding sleeve lower part and.

Therefore, the clamping structure on the valve is mainly composed of a static side clamping groove formed in the inner concave surface of the inner wall surface of the middle joint and a movable side clamping groove formed in the inner concave surface of the outer wall surface of the sliding sleeve, an elastic limiting clamping tongue is assembled in the static side clamping groove, and when the sliding sleeve slides and moves to the static side clamping groove of the movable side clamping groove corresponding to the middle joint, the elastic clamping tongue in the static side clamping groove can be embedded into the movable side clamping groove to limit the displacement of the sliding sleeve.

In order to ensure the stability of the operation of the clamping structure, the depth of the movable side clamping groove on the sliding sleeve is required to be smaller than the thickness of the clamping raised head, and when the clamping structure is triggered to enable the clamping raised head to be embedded into the movable side clamping groove on the sliding sleeve, the rear part of the clamping raised head is embedded into the static side clamping groove on the middle connector. So, make the sliding sleeve displacement downwards and when relieving spacing under the exogenic action, the downward displacement power of sliding sleeve can force joint plush copper to retreat effectively in the quiet side joint groove on the adapter, be unlikely to the joint plush copper strip leave and damage ejecting elastic element. Of course, in order to improve the smoothness when the limit is released, the outer edge of the clamping raised head can be matched with the movable side clamping groove on the sliding sleeve by a curved surface structure such as a fillet.

Example 3

The invention includes an outer tube assembly and a sliding sleeve.

Specifically, four static side clamping grooves are concavely formed in the upper part of an inner hole of the middle joint and are uniformly distributed in the circumferential direction of the middle joint; each static side clamping groove is internally connected with a clamping raised head through a plurality of ejection elastic elements (preferably springs), and the clamping raised heads can be ejected out of the static side clamping grooves under the action of the ejection elastic elements. Corresponding to it, also the indent is seted up four and is moved the side joint groove at sliding sleeve outer wall upper portion position, and these four move the side joint groove and be evenly distributed in the circumference of sliding sleeve, and with aforementioned four quiet side joint grooves on the well joint be the one-to-one relation in the circumference, move a side joint groove and correspond a quiet side joint groove promptly.

Specifically, a lifting elastic element and a lifting supporting plate are arranged between the bottom of the blind hole structure of the middle joint and the bottom end of the sliding sleeve. The bottom end of the lifting elastic element (preferably a spring) is seated on the bottom surface of the blind hole structure of the middle joint, the top end of the lifting elastic element is abutted to the bottom surface of the lifting supporting plate, and the outer diameter of the lifting elastic element is slightly smaller than the inner hole of the middle joint and is similar to the outer diameter of the sliding sleeve. The lifting support plate is of a plate-shaped structure, is lined at the bottom end of the sliding sleeve through the top surface, and the outer diameter of the lifting support plate is slightly smaller than the inner hole of the middle joint and is similar to the outer diameter of the sliding sleeve; the outer edge of the lifting support plate is provided with a sealing ring which can be in sealing contact with the inner wall of the inner hole of the middle joint, and the lifting support plate is assembled in the inner hole of the middle joint below the sliding sleeve in an axial sliding displacement mode. In the lifting structure, under the action of external force pressing, the downward force of the sliding sleeve acts on the lifting support plate, the lifting support plate moves downward to compress the lifting elastic element, and after the external force pressing effect is lost, the lifting elastic element releases the elastic force to force the lifting support plate to move upward to lift the sliding sleeve and move upward, so that the sliding sleeve is lifted; in this way, the height of the lifting structure in the middle joint should not exceed the flow guide structure, that is, the maximum height of the lifting structure is lower than the position of the flow guide hole on the static side of the middle joint and is below the flow guide structure.

In order to ensure that the descending sliding sleeve can be quickly and accurately communicated with the middle joint to form the flow guide structure, the bottom surface of the blind hole structure of the middle joint is provided with a bearing seat which protrudes upwards, and the bearing seat is positioned at the center of the lifting structure. The forming structure of the bearing seat has two basic requirements, one of which is that the height of the bulge of the bearing seat is required to be lower than that of the lifting structure, so that the action of the lifting structure cannot be influenced; secondly, the matching relation between the bearing seat and the lifting support plate is required to be matched with the matching relation between the movable side flow guide hole and the static side flow guide hole, and more specifically, in the initial state of the valve, the distance between the top end of the bearing seat and the lifting support plate of the lifting structure corresponds to the dislocation distance between the static side flow guide hole on the middle joint and the movable side flow guide hole on the sliding sleeve during cutting.

In addition, in order to enable the lifting structure to operate better and enable the bearing seat to be matched with the lifting structure better, the bearing seat is of a solid columnar structure; correspondingly, the center of the bottom of the lifting supporting plate is provided with a guide post which is protruded downwards and has a hollow cylindrical structure, the inner hole of the guide post is in axial correspondence with the bearing seat, and the inner hole of the guide post is slightly larger than the outer diameter of the bearing seat, so that the guide post at the bottom of the lifting supporting plate can be sleeved into the bearing seat and is in telescopic fit with the bearing seat in the compression process of the lifting structure.

The above examples are intended to illustrate the invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: the specific technical solutions of the above embodiments can still be modified, or some technical features can be equivalently replaced (for example, the ejection elastic element and/or the lifting elastic element are/is replaced by an elastic body material; for example, the upper joint and the middle joint are of an integrated structure; for example, the lifting supporting plate of the lifting structure is removed, and only two ends of the lifting elastic element are directly butted with the bottom surface of the blind hole and the bottom end of the sliding sleeve); and such modifications or substitutions do not depart from the spirit and scope of the present invention in its essence.

Claims

1. The utility model provides an intubate formula well cementation valve, includes outer tube subassembly and sliding sleeve (11), sliding sleeve (11) are in with the mode assembly that can the axial sliding displacement in the outer tube subassembly, the outer tube subassembly with be provided with at least a set of can pass through between sliding sleeve (11) the axial sliding displacement of sliding sleeve (11) and switch on/off the water conservancy diversion structure, its characterized in that: the outer tube subassembly with be provided with at least a set of can pass through between sliding sleeve (11) the axial sliding displacement of sliding sleeve (11) and block spacing/remove spacing joint structure, sliding sleeve (11) are in when blocking the spacing state in the outer tube subassembly, sliding sleeve (11) with water conservancy diversion structure between the outer tube subassembly is in the off-state.

2. The cannulated cementing valve of claim 1, wherein: the joint structure mainly by quiet side joint groove (9) that the indent was seted up on the outer tube assembly internal face with move side joint groove (21) that the indent was seted up on sliding sleeve (11) outer wall face are constituteed, be equipped with through ejecting elastic element (20) in quiet side joint groove (9) and pop out joint plush (17) of quiet side joint groove (9), sliding sleeve (11) sliding displacement extremely move side joint groove (21) corresponding to during quiet side joint groove (9) on the outer tube assembly, joint plush (17) embedding of popping out in quiet side joint groove (9) move in side joint groove (21).

3. The cannulated cementing valve of claim 2, wherein: when the clamping raised head (17) of the clamping structure is embedded into the movable side clamping groove (21) on the sliding sleeve (11), the rear part of the clamping raised head (17) is embedded into the static side clamping groove (9) on the outer tube assembly.

4. The cannulated cementing valve of claim 2 or 3, wherein: the outer edge of the clamping raised head (17) is matched with a movable side clamping groove (21) on the sliding sleeve (11) in a curved surface structure.

5. The cannulated cementing valve of claim 1, 2 or 3, wherein: the clamping structure is positioned above the flow guide structure.

6. The cannulated cementing valve of claim 1 or 2, wherein: the inner part of the outer tube assembly is provided with a blind hole structure, the sliding sleeve (11) is assembled in the blind hole structure of the outer tube assembly in a mode of axial sliding displacement, an elastic lifting structure is arranged between the bottom of the blind hole structure in the outer tube assembly and the bottom of the sliding sleeve (11), and the lifting structure is located below the flow guide structure.

7. The cannulated cementing valve of claim 6, wherein: the lifting structure mainly comprises a lifting support plate (13) and a lifting elastic element (14), wherein the lifting support plate (13) is lined at the bottom end of the sliding sleeve (11) and is assembled in a blind hole structure of the outer pipe assembly in an axial sliding displacement mode, and the lifting elastic element (14) is assembled between the lifting support plate (13) and the bottom of the blind hole structure in the outer pipe assembly.

8. The cannulated cementing valve of claim 7, wherein: the bottom of the blind hole structure at the lifting structure is provided with a bearing seat (15) protruding upwards, and the protruding height of the bearing seat (15) is lower than that of the lifting structure; in the initial state, the distance between the bearing seat (15) and the lifting supporting plate (13) of the lifting structure corresponds to the dislocation distance of the flow guide structure between the outer pipe assembly and the sliding sleeve when the flow guide structure is cut off.

9. The cannulated cementing valve of claim 8, wherein: the bottom of a lifting supporting plate (13) of the lifting structure is provided with a guide column (16) protruding downwards, and the guide column (16) is in telescopic fit with the bearing seat (5) in the contraction process of the lifting structure.

10. The cannulated cementing valve of claim 7 or 9, wherein: and the outer edge of the lifting supporting plate (13) is provided with a sealing ring which can be in sealing contact with the inner wall of the outer pipe assembly.