A washable well packer

Abstract

The utility model relates to oilfield downhole packer technical field especially can wash well with packer, including washable well packer main part, packer part and lower joint, the packer part swing joint is in the middle of washable well packer main part, the end of washable well packer main part is fixedly connected with upper joint, and one end of upper joint is equipped with washable well packer water pressure resistance butt joint structure. This washable well packer, sealing pipe inserts to the inside of upper joint, then utilizes butt bolt rotation and is tightly fixed and is connected, and the connecting box adopts high -strength metal steel to be made, and multiple water channels are set up on every buffer baffle, but the water channel on adjacent two buffer baffles is staggered arrangement, therefore the other end water enters the inside of connecting box, will be blocked by buffer baffle, and water flow is guided in the water channel other side discharge after the bending of buffer baffle, and therefore the tortuous water channel line can block the effect of water pressure directly to packer, and improve water pressure resistance performance.

Description

Technical Field

[0001] This utility model relates to the technical field of downhole packers in oilfields, specifically a washable packer for wells. Background Technology

[0002] Downhole packers are widely used in oilfield development. As oil and gas fields develop to a certain stage, the amount of mechanical blocking of formations and acidizing of sorting formations gradually increases. According to their application scope, downhole packers are mainly divided into two categories: oil testing, oil production, and water injection packers, and well completion, sand control, and water shut-off packers. However, regardless of the type of packer, its conventional function is usually only to seal.

[0003] For example, the publication number "CN202937224U" describes a washable well packer. It utilizes unidirectional slip support, tubing weight for setting, and tubing string lifting for unsealing. It is suitable for processes such as stratified oil testing, oil production, testing, water finding, water shut-off, and acidizing. It can also be used for backwashing operations. However, washable well packers require insertion into the tubing well to seal the well's inner wall. Water needs to be introduced into the rear of the packer because the wellbore is deep and in a sealed environment. This requires a high water pressure to inject water into the packer. Excessive water pressure forces the connection between the water supply section and the packer to withstand even greater pressure. Current washable well packer end connections rely on common pin-fit installation, which has poor resistance to water pressure, ultimately resulting in less than ideal performance. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of poor performance of washable well packers, and to propose a washable well packer.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] Design a washable well packer, including a washable well packer body, a packer part and a lower connector. The packer part is movably connected to the middle of the washable well packer body. An upper connector is fixedly connected to the end of the washable well packer body. One end of the upper connector is provided with a water pressure resistant docking structure for the washable well packer.

[0007] The water pressure resistant docking structure of the washable well packer includes a connecting box and a sealing pipe. The sealing pipe is fixedly inserted into the inner side of the upper connector. The other end of the sealing pipe is fixedly connected to the connecting box. Multiple docking bolts are threaded on the outer side of the sealing pipe. The two ends of the connecting box are fixedly provided with communicating cavities. Multiple buffer plates are fixedly installed inside the connecting box. Water passage grooves are fixedly installed on the inner side of the multiple buffer plates.

[0008] Preferably, the end of the communicating cavity is connected to the inner side of the upper connector.

[0009] Preferably, the other side of the connecting box is provided with an external water supply pipe structure, the external water supply pipe structure includes an installation sleeve and a threaded pipe, the threaded pipe is fixedly connected to the other side of the outer wall of the connecting box, the outer side of the threaded pipe is threadedly connected to the installation sleeve, the other end of the installation sleeve is fixedly connected to an installation flange, and the other end of the installation flange is fixedly installed with an external water pipe.

[0010] Preferably, the interior of the threaded tube communicates with the cavity.

[0011] Preferably, the lower connector is fixedly connected to the other end of the washable well packer body, and the rear side of the lower connector is connected to the inner side of the upper connector through the washable well packer body.

[0012] The present invention proposes a washable well packer with the following advantages: the sealing pipe is inserted into the upper connector and then fixedly connected by rotating and tightening the butt bolts. The connection box is made of high-strength metal steel, and multiple water passage grooves are opened on each buffer plate. However, the water passage grooves on adjacent buffer plates are staggered. Therefore, after the water enters the connection box from the other end, it will be blocked by the buffer plate. The water flow is guided by the bend of the buffer plate and discharged on the other side of the water passage groove. Therefore, the tortuous water passage can block the water pressure from directly affecting the packer and improve its water pressure resistance. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0014] Figure 2 for Figure 1 A frontal sectional view;

[0015] Figure 3 for Figure 1 A side sectional view;

[0016] Figure 4 for Figure 2 Enlarged sectional view of section A in the middle;

[0017] Figure 5 for Figure 2 Enlarged sectional view of section B.

[0018] In the diagram: 1. Main body of washable well packer; 2. Packer section; 3. Lower connector; 4. Upper connector; 5. Water pressure resistant docking structure of washable well packer; 51. Connecting box; 52. Sealing pipe; 53. Docking bolt; 54. Connecting cavity; 55. Buffer plate; 6. External water supply pipe structure; 61. Mounting sleeve; 62. Threaded pipe; 63. Mounting flange; 64. External water pipe. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] Please see Figure 1-5 In this embodiment, a washable well packer includes a washable well packer body 1, a packer portion 2, and a lower connector 3. The washable well packer body 1 belongs to the prior art disclosed in prior art document CN202937224U entitled "Washable Well Packer". It comprises an upper backwash sleeve, a central tube, an outer central tube, a long rubber sleeve, a short rubber sleeve, a spacer ring, a pressure ring, a sealing ring, a backwash valve seat, a backwash piston, a sealing ring, and a lower backwash sleeve. The packer consists of a sealing ring, a cone, a straightening slip, a slip clamp, an outer spring, an inner spring, a slip groove, a support ring, an anti-loosening pin, a swing ring, a track pin, a lower connector, a long track, a short track upper dead point, a short track, and a track lower dead point. The packer part 2 is movably connected to the middle of the washable well packer body 1. The end of the washable well packer body 1 is fixedly connected to an upper connector 4. The outer side of the upper connector 4 is provided with a washable well packer water pressure resistant docking structure 5.

[0021] The water-pressure resistant packer structure 5 for washable wells includes a connecting box 51 and a sealing pipe 52. The sealing pipe 52 is fixedly inserted into the inner side of the upper connector 4. The sealing pipe 52 is inserted into the interior of the upper connector 4 and then fixedly connected by rotating and tightening the connecting bolts 53. The other end of the sealing pipe 52 is fixedly connected to the connecting box 51. Multiple connecting bolts 53 are threaded onto the outer side of the sealing pipe 52. The connecting box 51 is made of high-strength metal steel. Multiple buffer plates 55 are horizontally welded to the inner side of the connecting box 51. Multiple water passage grooves 56 are opened on each buffer plate 55, but adjacent buffer plates... The water channels 56 on the partition 55 are arranged in an alternating manner. Therefore, after the water enters the connection box 51 from the other end, it will be blocked by the buffer partition 55. The water flow is guided by the bend of the buffer partition 55 and discharged on the other side of the water channel 56. Therefore, the tortuous water channel can block the water pressure from directly affecting the packer and improve the water pressure resistance. The two ends of the connection box 51 are fixedly provided with connecting cavities 54. Multiple buffer partitions 55 are fixedly installed inside the connection box 51. Water channels 56 are fixedly installed on the inner side of the multiple buffer partitions 55. The end of the connecting cavity 54 is connected to the inner side of the upper connector 4.

[0022] On the other side of the connecting box 51, there is an external water supply pipe structure 6. The external water supply pipe structure 6 includes an installation sleeve 61 and a threaded pipe 62. The threaded pipe 62 is fixedly connected to the other side of the outer wall of the connecting box 51. The installation sleeve 61 is threadedly connected to the outer side of the threaded pipe 62. The threaded pipe 62 can rotate and be screwed into the inner side of the installation sleeve 61 with the connecting box 51. The installation sleeve 61 is connected to the external water pipe 64 that supplies water through a metal stainless steel installation flange 63. The installation flange 63 is fixedly connected to the other end of the installation sleeve 61. The external water pipe 64 is fixedly installed at the other end of the installation flange 63. The inside of the threaded pipe 61 is connected to the cavity 54.

[0023] The outer wall of the outer sheath 65 is slidably connected to the inner wall of the upper connector 4, the inner side of the clamping plate 64 is slidably connected to the outer wall of the upper connector 4, the lower connector 3 is fixedly connected to the other end of the packer body 1 for washable wells, and the rear side of the lower connector 3 is connected to the inner side of the upper connector 4 through the packer body 1 for washable wells.

[0024] Working principle:

[0025] When using a washable well packer, the packer consists of an upper backwash sleeve, a central tube, an outer central tube, a long rubber sleeve, a short rubber sleeve, a spacer ring, a pressure ring, a sealing ring, a backwash valve seat, a backwash piston, a sealing ring, a lower backwash sleeve, a sealing ring, a cone, a centralizing slip, a slip clamp, an outer spring, an inner spring, slip grooves, a support ring, an anti-loosening pin, a swing ring, a track pin, a lower connector, a long track, a short track top dead point, a short track, and a track bottom dead point. The sealing ring is installed in the sealing ring groove of the central tube. After embedding the sealing ring in the inner and outer sealing ring grooves of the backwash piston, it is installed into the inner hole of the lower backwash sleeve. After embedding the sealing ring in the sealing ring groove of the backwash valve seat, it is threaded and tightened to the lower backwash sleeve. This assembly is then fitted from the upper end of the central tube onto the outer cylindrical surface of the central tube. The sealing ring is embedded in the sealing ring groove of the pressure ring and then fitted onto the outer central tube. The long rubber sleeve, ... The short rubber sleeve and spacer ring are fitted onto the outer central tube. The outer central tube is then connected to the upper backwash sleeve via threads and tightened. This assembly is then fitted onto the outer cylindrical surface of the central tube from the top end. The two assembled assemblies are then connected to the backwash valve seat via pressure rings and tightened. The upper connector is then connected to the central tube and the upper backwash sleeve via threads and tightened. The sealing ring is embedded into the sealing ring groove of the cone and then connected to the lower backwash sleeve via threads and tightened. The slip clamp is fitted onto the slip groove, and the straightening slip is inserted into the slip groove and fixed by the slip clamp. The inner and outer springs are installed inside the straightening slip. This assembly is then fitted onto the central tube from the bottom end and moved to the cone. The swing ring is fitted onto the central tube and symmetrical track pins are installed and moved to the slip groove. The support ring is then fitted onto the central tube and connected to the slip groove via threads and tightened. Anti-loosening pins are installed. Finally, the lower connector is connected to the central tube via threads and tightened.

[0026] The sealing tube 52 is inserted into the upper connector 4 and then fixedly connected by rotating and tightening the butt bolts 53. The other end of the sealing tube 52 is fixedly connected to the connecting box 51. Multiple butt bolts 53 are threaded on the outside of the sealing tube 52. The connecting box 51 is made of high-strength metal steel. Multiple buffer plates 55 are horizontally welded on the inner side of the connecting box 51. Multiple water passage grooves 56 are opened on each buffer plate 55. However, the water passage grooves 56 on two adjacent buffer plates 55 are staggered. Therefore, after the water enters the connecting box 51 from the other end, it will be blocked by the buffer plate 55. The water flow is guided by the bend of the buffer plate 55 and discharged on the other side of the water passage groove 56. Therefore, the tortuous water passage can block the water pressure from directly acting on the packer and improve the water pressure resistance.

[0027] The threaded pipe 62 is fixedly connected to the other side of the outer wall of the connecting box 51. The outer side of the threaded pipe 62 is threadedly connected to the mounting sleeve 61. The threaded pipe 62 can rotate and be screwed into the inner side of the mounting sleeve 61 along with the connecting box 51. The mounting sleeve 61 is connected to the external water pipe 64 that delivers water through the metal stainless steel mounting flange 63.

[0028] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A washable well packer, comprising a washable well packer body (1), a packer portion (2), and a lower connector (3), wherein the packer portion (2) is movably connected to the middle of the washable well packer body (1), characterized in that: The end of the washable well packer body (1) is fixedly connected to an upper connector (4). One end of the upper connector (4) is provided with a water pressure resistant docking structure (5) for the washable well packer. The water pressure resistant docking structure (5) for the washable well packer includes a connecting box (51) and a sealing pipe (52). The sealing pipe (52) is fixedly inserted into the inner side of the upper connector (4). The other end of the sealing pipe (52) is fixedly connected to the connecting box (51). Multiple docking bolts (53) are threadedly connected to the outer side of the sealing pipe (52). A connecting cavity (54) is fixedly opened at both ends of the connecting box (51). Multiple buffer plates (55) are fixedly installed inside the connecting box (51). A water passage groove (56) is fixedly installed on the inner side of the multiple buffer plates (55).

2. The washable well packer according to claim 1, characterized in that: The end of the connecting cavity (54) is connected to the inner side of the upper connector (4).

3. The washable well packer according to claim 2, characterized in that: The other side of the connecting box (51) is provided with an external water supply pipe structure (6). The external water supply pipe structure (6) includes an installation sleeve (61) and a threaded pipe (62). The threaded pipe (62) is fixedly connected to the other side of the outer wall of the connecting box (51). The outer side of the threaded pipe (62) is threadedly connected to the installation sleeve (61). The other end of the installation sleeve (61) is fixedly connected to an installation flange (63). The other end of the installation flange (63) is fixedly installed with an external water pipe (64).

4. The washable well packer according to claim 3, characterized in that: The interior of the threaded tube (62) is connected to the cavity (54).

5. The washable well packer according to claim 4, characterized in that: The lower connector (3) is fixedly connected to the other end of the packer body (1) for washable wells, and the rear side of the lower connector (3) is connected to the inner side of the upper connector (4) through the packer body (1).

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