A formation pressure balance cementing device

Abstract

The present invention discloses a formation pressure balance cementing device, comprising a cement head body, a pneumatic limiting mechanism, and a release control mechanism. A rubber plug is arranged in the cement head body, the pneumatic limiting mechanism is arranged on one side of the rubber plug, the pneumatic limiting mechanism comprises a limiting ring, the limiting ring is connected to the cement head body, a pair of sealing drive boxes are arranged in the limiting ring, and a limiting block is arranged in each of the pair of sealing drive boxes, the limiting block matches the rubber plug, a plurality of uniformly distributed reset springs are connected between the sealing drive box and the limiting ring, the release control mechanism is arranged on the outside of the limiting ring, the release control mechanism comprises a compressed gas cylinder, and the compressed gas cylinder is connected to the limiting ring. The present invention controls the release process of the rubber plug by adopting a pneumatic control method, simplifies the rubber plug release process during the use of the cementing cement head, improves the convenience of using the cementing cement head, and improves the stability of using the cementing cement head.

Description

Technical Field

[0001] The invention belongs to the technical field of oil field cementing devices, and in particular relates to a formation pressure balance cementing device. Background Art

[0002] Balanced pressure drilling means that during drilling, the pressure of the liquid column in the wellbore is equal to the formation pressure. The difference between the pressure of the liquid column in the wellbore and the pressure of the oil and gas layer during drilling represents the level of drilling. The smaller the difference, the less damage to the oil and gas layer. However, the smaller the difference, the more likely drilling accidents will occur. During the drilling process in the oil field, in order to reinforce the well wall to ensure continuous and safe advancement, to isolate the oil, gas and water layers, to ensure the stratification test during the exploration and the reasonable oil and gas production during the entire mining process, high-quality steel pipes are lowered and cement is filled in the wellbore and steel pipe annulus. This operation is called cementing engineering.

[0003] At present, the general formation pressure balance cementing device mainly includes the steps of casing lowering, cementing, wellhead installation and casing pressure testing and cementing quality inspection. The common formation pressure balance cementing equipment is mainly composed of circulation joints, cementing heads, cementing plugs, casing heads and other tools. Among them, the cementing head is used to connect the casing and various pipelines, so as to facilitate the completion of circulation, spacer fluid injection, cement slurry injection, plug release, slurry replacement and other processes.

[0004] Most cementing heads are composed of a cement head body, a rubber plug, a flexible joint, a stop pin and a threaded rod. During use, the stop pin is mainly moved and controlled by rotating the threaded rod, and the rubber plug is released by the movement of the stop pin.

[0005] The existing cementing heads mainly use a rotating threaded rod to control the movement of the stop pin. In the actual process of releasing the rubber plug, it is necessary to rotate more than ten circles to withdraw the stop pin, which makes the release process of the rubber plug of the cementing head more complicated. At the same time, the rubber plug will tilt as the stop pin is withdrawn, making the rubber plug easily damaged by the stop pin during the release process, thereby reducing the stability of the cementing head.

[0006] Therefore, in view of the above technical problems, it is necessary to provide a formation pressure balanced cementing device. Summary of the invention

[0007] The object of the present invention is to provide a formation pressure balanced cementing device to solve the problem of poor stability in use of the above-mentioned cementing cement head.

[0008] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0009] A formation pressure balanced cementing device, comprising: a cement head body, a pneumatic limiting mechanism, and a release control mechanism;

[0010] A rubber plug is provided in the cement head body;

[0011] The pneumatic limiting mechanism is arranged on one side of the rubber plug, and the pneumatic limiting mechanism comprises a limiting ring, the limiting ring is connected to the cement head body, a pair of sealing drive boxes are arranged in the limiting ring, and a limiting block is arranged in each of the pair of sealing drive boxes, the limiting block matches the rubber plug, and a plurality of evenly distributed return springs are connected between the sealing drive box and the limiting ring;

[0012] The release control mechanism is arranged on the outer side of the limiting ring, and the release control mechanism comprises a compressed gas cylinder, which is connected to the limiting ring, and a piston plate is arranged inside the compressed gas cylinder.

[0013] Furthermore, a pair of the sealing drive boxes are symmetrically distributed on both sides of the limit ring, so that the limit block can be supported, limited and moved by a pair of sealing drive boxes. The limit block is arranged in a trapezoidal shape on one side of the cement head body. By arranging the limit block in a trapezoidal shape, it is convenient for the limit block to guide the rubber plug to fall during movement, thereby improving the release stability of the rubber plug.

[0014] Furthermore, a pair of the sealed drive boxes are connected by a conducting pipe, which serves to connect the pair of sealed drive boxes, thereby facilitating movement control of the limit stopper.

[0015] Furthermore, a plurality of evenly distributed stepped air guide grooves are excavated on the outer side of the compressed air cylinder. The stepped air guide grooves are excavated to facilitate the outside air to enter the compressed air cylinder under the action of the stepped air guide grooves. At the same time, the stepped air guide grooves limit the partition. Partitions are provided on one side of the plurality of stepped air guide grooves located in the compressed air cylinder, so that the stepped air guide grooves can be blocked and controlled by moving the partitions, thereby facilitating the control of the air intake state of the stepped air guide grooves.

[0016] Furthermore, a plurality of the partitions and the compressed gas cylinder are hingedly connected with limit pins, and the limit pins serve to connect the partitions and the compressed gas cylinder, so as to support and limit the partitions through the limit pins.

[0017] Furthermore, a compression spring is connected between the piston plate and the compressed air cylinder. The compression spring serves to connect the piston plate and the compressed air cylinder, so that the piston plate can be supported and reset by contraction and reset of the compression spring. A driving piston rod is connected to the side of the piston plate away from the compression spring, and the movement of the piston plate is controlled by applying a force to the driving piston rod. A control plate is connected to the end of the driving piston rod located outside the compressed air cylinder, so that the movement of the driving piston rod can be controlled by applying a force to the control plate.

[0018] Furthermore, a one-way conducting tube is connected between the compressed gas cylinder and the sealed driving box, and the one-way conducting tube serves to connect the compressed gas cylinder and the sealed driving box, so that the gas in the sealed driving box can be transported and discharged under the action of the one-way conducting tube, thereby facilitating the control of the movement state of the limit block through the change of the gas pressure in the sealed driving box. The diameter of the one-way conducting tube in the compressed gas cylinder is smaller than the diameter in the sealed driving box.

[0019] Furthermore, a sealing ball is provided in the one-way conductive tube, which plays a role of sealing and controlling the one-way conductive tube. A limiting net is provided on the side of the sealing ball away from the compressed air cylinder, which plays a role of limiting the movement of the sealing ball. A sealing spring is connected between the sealing ball and the limiting net, which plays a role of connecting the sealing ball and the limiting net, so that the sealing ball can be supported and reset through the contraction and reset of the sealing spring, thereby facilitating the control of the sealing state of the one-way conductive tube.

[0020] Furthermore, an exhaust rod is provided in the driving piston rod, and the exhaust rod serves to connect and discharge the gas in the sealed driving box. The exhaust rod is connected to a conduction control component at one end outside the piston plate, and conduction control is performed on the one-way conduction tube and the exhaust rod through the interaction between the conduction control component and the one-way conduction tube. Exhaust grooves are drilled in the exhaust rod and the conduction control component, which facilitates the discharge of the gas in the sealed driving box through the exhaust grooves. The exhaust rod is connected to an exhaust component on the side away from the conduction control component, which facilitates the movement control of the exhaust rod by applying a force to the exhaust component.

[0021] Furthermore, a limit control cavity matching the exhaust rod is excavated in the one-way guide tube. The limit control cavity is convenient for installation and limiting, and at the same time, it plays a role in movement control for the exhaust rod. A support spring is provided in the limit control cavity. The support spring is sleeved on the outside of the exhaust rod. The exhaust rod is supported and limited by the contraction and reset of the support spring.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The present invention controls the release process of the rubber plug by adopting a pneumatic control method, thereby simplifying the release process of the rubber plug during the use of the cementing cement head, improving the convenience of using the cementing cement head, and improving the use stability of the cementing cement head. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a partial structural schematic diagram of a formation pressure balance cementing device in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0027] Figure 3 It is a top cross-sectional view of a formation pressure balance cementing device in one embodiment of the present invention;

[0028] Figure 4 for Figure 3 Schematic diagram of the structure at B in the middle;

[0029] Figure 5 for Figure 3 Schematic diagram of the structure at C in the middle;

[0030] Figure 6 It is a stereoscopic diagram of a formation pressure balance cementing device in one embodiment of the present invention.

[0031] In the figure: 1. cement head body, 101. rubber plug, 2. pneumatic limiting mechanism, 201. limiting ring, 202. sealing drive box, 203. limiting block, 204. reset spring, 205. conducting pipe, 3. release control mechanism, 301. compressed air cylinder, 302. piston plate, 303. stepped air guide groove, 304. partition, 305. limiting pin, 306. compression spring, 307. driving piston rod, 308. control board, 309. one-way conducting pipe, 310. blocking ball, 311. limiting net, 312. blocking spring, 313. exhaust rod, 314. conducting control part, 315. exhaust part, 316. limiting control chamber, 317. supporting spring. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below in conjunction with the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0033] The invention discloses a formation pressure balance cementing device, Figure 1-Figure 6 As shown, it includes: a cement head body 1, a pneumatic limiting mechanism 2, and a release control mechanism 3.

[0034] Ginseng Figure 1-Figure 2 As shown, a rubber plug 101 is provided in the cement head body 1, so as to assist the cementing of the cement head body 1 through the rubber plug 101.

[0035] Ginseng Figure 1-Figure 2 As shown, the pneumatic limiting mechanism 2 is arranged on one side of the rubber plug 101 , so as to facilitate the pneumatic limiting mechanism 2 to perform limiting control on the rubber plug 101 .

[0036] Ginseng Figure 1-Figure 2 As shown, the pneumatic limiting mechanism 2 includes a limiting ring 201 , which is connected to the cement head body 1 , and the limiting ring 201 plays a role of limiting and fixing the sealing drive box 202 .

[0037] Ginseng Figure 1-Figure 2 As shown, a pair of sealing drive boxes 202 are provided in the limiting ring 201 , and the limiting block 203 is supported, limited and moved by the pair of sealing drive boxes 202 .

[0038] Ginseng Figure 1-Figure 2 As shown, a pair of sealed drive boxes 202 are each provided with a limit block 203, which matches the rubber plug 101. The limit block 203 supports and limits the rubber plug 101, and at the same time, the release process of the rubber plug 101 is controlled by the movement and resetting of the limit block 203.

[0039] Ginseng Figure 1-Figure 2 As shown, a plurality of evenly distributed return springs 204 are connected between the sealing drive box 202 and the limit ring 201. The return springs 204 connect the sealing drive box 202 and the limit ring 201, so that the limit block 203 can be supported and reset through the contraction and reset of the return springs 204.

[0040] A pair of sealed driving boxes 202 are symmetrically distributed on both sides of the limiting ring 201 , so as to facilitate the supporting, limiting and moving control of the limiting block 203 through the pair of sealed driving boxes 202 .

[0041] Specifically, the limit stopper 203 is arranged in a trapezoidal shape on one side of the cement head body 1. The trapezoidal shape of the limit stopper 203 facilitates the limit stopper 203 to guide the rubber plug 101 to fall during movement, thereby improving the release stability of the rubber plug 101.

[0042] Ginseng Figure 3 As shown, a pair of sealed drive boxes 202 are connected by a conducting tube 205 , and the conducting tube 205 serves to connect the pair of sealed drive boxes 202 , so as to facilitate the movement control of the limit stopper 203 .

[0043] Ginseng Figure 3-Figure 5 As shown, the release control mechanism 3 is arranged on the outside of the limit ring 201, so as to control the moving state of the limit block 203 by controlling the gas pressure in the limit ring 201 through the release control mechanism 3, thereby controlling the limit state of the rubber plug 101.

[0044] Ginseng Figure 3-Figure 5 As shown, the release control mechanism 3 includes a compressed gas cylinder 301, which is connected to the limiting ring 201. The compressed gas cylinder 301 plays the role of storing air and is convenient for transporting gas into the limiting ring 201 by compressing the air in the compressed gas cylinder 301.

[0045] Ginseng Figure 3-Figure 5 As shown, a piston plate 302 is provided in the compressed air cylinder 301 , and the movement of the piston plate 302 plays a role in compression control of the air in the compressed air cylinder 301 .

[0046] In addition, a plurality of evenly distributed stepped air guide grooves 303 are excavated on the outer side of the compressed air cylinder 301. The stepped air guide grooves 303 are excavated to facilitate the outside air to enter the compressed air cylinder 301 under the action of the stepped air guide grooves 303. At the same time, the stepped air guide grooves 303 limit the partition 304.

[0047] Ginseng Figure 3-Figure 5 As shown, a partition plate 304 is provided on one side of the plurality of stepped air guide grooves 303 located in the compressed air cylinder 301, so as to facilitate blocking and controlling the stepped air guide grooves 303 by moving the partition plate 304, thereby facilitating controlling the air intake state of the stepped air guide grooves 303.

[0048] Ginseng Figure 3-Figure 5 As shown, a limit pin 305 is hinged between the plurality of partitions 304 and the compressed air cylinder 301 , and the limit pin 305 serves to connect the partition 304 and the compressed air cylinder 301 , so as to support and limit the partition 304 through the limit pin 305 .

[0049] Ginseng Figure 3-Figure 5 As shown, a compression spring 306 is connected between the piston plate 302 and the compressed air cylinder 301. The compression spring 306 connects the piston plate 302 and the compressed air cylinder 301, so that the piston plate 302 can be supported and reset through the contraction and reset of the compression spring 306.

[0050] Ginseng Figure 3-Figure 5 As shown, a driving piston rod 307 is connected to the side of the piston plate 302 away from the compression spring 306 , and a force is applied to the driving piston rod 307 to control the movement of the piston plate 302 .

[0051] Ginseng Figure 3-Figure 5 As shown, one end of the driving piston rod 307 outside the compressed air cylinder 301 is connected to a control board 308 , so as to facilitate movement control of the driving piston rod 307 by applying force to the control board 308 .

[0052] Ginseng Figure 3-Figure 5 As shown, a one-way conducting tube 309 is connected between the compressed gas cylinder 301 and the sealed driving box 202. The one-way conducting tube 309 serves to connect the compressed gas cylinder 301 and the sealed driving box 202, so that the gas in the sealed driving box 202 can be transported and discharged under the action of the one-way conducting tube 309, thereby facilitating the control of the movement state of the limit stop 203 through the change of the gas pressure in the sealed driving box 202.

[0053] Preferably, the diameter of the one-way guide tube 309 in the compressed gas cylinder 301 is smaller than the diameter in the sealed drive box 202 .

[0054] Ginseng Figure 3-Figure 5 As shown, a blocking ball 310 is provided in the one-way conducting tube 309 , and the blocking ball 310 plays a role of blocking and controlling the one-way conducting tube 309 .

[0055] Ginseng Figure 3-Figure 5 As shown, a limiting net 311 is provided on the side of the blocking ball 310 away from the compressed air cylinder 301 , and the limiting net 311 serves to limit the movement of the blocking ball 310 .

[0056] Ginseng Figure 3-Figure 5 As shown, a blocking spring 312 is connected between the blocking ball 310 and the limiting net 311. The blocking spring 312 serves to connect the blocking ball 310 and the limiting net 311, so that the blocking ball 310 can be supported and reset through the contraction and reset of the blocking spring 312, thereby facilitating the control of the blocking state of the one-way guide tube 309.

[0057] Ginseng Figure 3-Figure 5 As shown, an exhaust rod 313 is provided inside the driving piston rod 307, and the exhaust rod 313 serves to communicate and discharge the gas inside the sealed driving box 202.

[0058] Ginseng Figure 3-Figure 5 As shown, one end of the exhaust rod 313 outside the piston plate 302 is connected to a conduction control member 314 , which controls the conduction between the one-way conduction tube 309 and the exhaust rod 313 through the interaction between the conduction control member 314 and the one-way conduction tube 309 .

[0059] Specifically, exhaust grooves are formed in the exhaust rod 313 and the conduction control member 314 to facilitate the discharge of gas in the sealed drive box 202 through the exhaust grooves.

[0060] Ginseng Figure 3-Figure 5 As shown, the exhaust member 315 is connected to the side of the exhaust rod 313 away from the conduction control member 314, so as to facilitate the movement control of the exhaust rod 313 by applying a force to the exhaust member 315.

[0061] A limit control cavity 316 matching the exhaust rod 313 is excavated in the unidirectional guide tube 309 . The limit control cavity 316 is excavated to facilitate installation and positioning of the limit control cavity 316 , and the exhaust rod 313 is controlled in motion at the same time.

[0062] Ginseng Figure 3-Figure 5 As shown, a support spring 317 is provided in the limit control chamber 316 , and the support spring 317 is sleeved on the outside of the exhaust rod 313 , and the exhaust rod 313 is supported and limited by the contraction and reset of the support spring 317 .

[0063] In specific use, the stopper 203 supports and limits the rubber plug 101. When the rubber plug 101 needs to be released, the driving piston rod 307, the exhaust rod 313 and the conduction control member 314 are controlled to move by applying a force to the exhaust member 315 and the control plate 308. The conduction control member 314 applies a force to the blocking ball 310 to control the movement of the blocking ball 310. The movement of the blocking ball 310 makes the limit ring 20 1 is connected with the compressed air cylinder 301 through the one-way guide tube 309. When the one-way guide tube 309 is turned on, the air in the limit ring 201 is transported to the conduction control member 314 under the action of the one-way guide tube 309, and is discharged through the exhaust rod 313 and the exhaust groove on the conduction control member 314. After the air in the limit ring 201 is discharged, the limit stopper 203 is reset under the action of the reset spring 204, and the limit on the rubber plug 101 is released by the reset of the limit stopper 203;

[0064] When the rubber plug 101 needs to be limited, the driving piston rod 307 is pulled. During the pulling process of the driving piston rod 307, the outside air is transported to the compressed air cylinder 301 under the action of the stepped air guide groove 303. Then, the exhaust groove on the conduction control component 314 is manually blocked, and the movement of the piston plate 302 is controlled by pressing the control plate 308. Through the movement of the piston plate 302, the air in the compressed air cylinder 301 is transported to the one-way guide pipe 309 under the compression of the piston plate 302. The compressed air is transported to the limit ring 201 through the one-way guide pipe 309. The air pressure in the limit ring 201 is adjusted by transporting compressed air into the limit ring 201, so that the limit block 203 moves under the action of the air pressure, and the rubber plug 101 is limited by the limit block 203.

[0065] It can be seen from the above technical solutions that the present invention has the following beneficial effects:

[0066] The present invention controls the release process of the rubber plug by adopting a pneumatic control method, thereby simplifying the release process of the rubber plug during the use of the cementing cement head, improving the convenience of using the cementing cement head, and improving the use stability of the cementing cement head.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A formation pressure balance cementing device, characterized in that: include: A cement head body (1), wherein a rubber plug (101) is provided inside the cement head body (1); A pneumatic limiting mechanism (2) is arranged on one side of the rubber plug (101), the pneumatic limiting mechanism (2) comprises a limiting ring (201), the limiting ring (201) is connected to the cement head body (1), a pair of sealing drive boxes (202) are arranged inside the limiting ring (201), and a limiting block (203) is arranged inside each of the pair of sealing drive boxes (202), the limiting block (203) matches the rubber plug (101), and a plurality of evenly distributed return springs (204) are connected between the sealing drive box (202) and the limiting ring (201); A release control mechanism (3) is arranged outside the limiting ring (201), the release control mechanism (3) comprises a compressed air cylinder (301), the compressed air cylinder (301) is connected to the limiting ring (201), and a piston plate (302) is arranged inside the compressed air cylinder (301); A compression spring (306) is connected between the piston plate (302) and the compressed air cylinder (301); a driving piston rod (307) is connected to a side of the piston plate (302) away from the compression spring (306); and a control plate (308) is connected to an end of the driving piston rod (307) located outside the compressed air cylinder (301); An exhaust rod (313) is provided inside the driving piston rod (307); one end of the exhaust rod (313) located outside the piston plate (302) is connected to a conduction control component (314); exhaust grooves are bored inside the exhaust rod (313) and the conduction control component (314); and a side of the exhaust rod (313) away from the conduction control component (314) is connected to an exhaust component (315).

2. A formation pressure balance cementing device according to claim 1, characterized in that: A pair of the sealing drive boxes (202) are symmetrically distributed on both sides of the limiting ring (201), and the limiting stopper (203) is arranged in a trapezoidal shape on one side located inside the cement head body (1).

3. The formation pressure balance cementing device according to claim 1, characterized in that: A conducting pipe (205) is connected between the pair of sealed drive boxes (202).

4. The formation pressure balance cementing device according to claim 1, characterized in that: The outer side of the compressed air cylinder (301) is provided with a plurality of evenly distributed stepped air guide grooves (303), and a partition plate (304) is provided on one side of the plurality of stepped air guide grooves (303) located inside the compressed air cylinder (301).

5. A formation pressure balance cementing device according to claim 4, characterized in that: A limiting pin shaft (305) is hingedly connected between the plurality of partitions (304) and the compressed air cylinder (301).

6. The formation pressure balance cementing device according to claim 1, characterized in that: A one-way conducting tube (309) is connected between the compressed air cylinder (301) and the sealed driving box (202); the diameter of the one-way conducting tube (309) inside the compressed air cylinder (301) is smaller than the diameter of the one-way conducting tube (309) inside the sealed driving box (202).

7. A formation pressure balance cementing device according to claim 6, characterized in that: A blocking ball (310) is arranged in the one-way conducting tube (309), a limiting net (311) is arranged on a side of the blocking ball (310) away from the compressed air cylinder (301), and a blocking spring (312) is connected between the blocking ball (310) and the limiting net (311).

8. A formation pressure balance cementing device according to claim 7, characterized in that: A position limiting control cavity (316) matching the exhaust rod (313) is bored in the one-way conducting tube (309), a support spring (317) is arranged in the position limiting control cavity (316), and the support spring (317) is sleeved on the outside of the exhaust rod (313).

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