Tubular column for clamping and sealing oil layer by double packers

Abstract

The utility model relates to the technical field of negative pressure oil extraction integration, in particular to a tubular column with double packers for clamping and sealing an oil layer, which comprises an oil pipe, a hydraulic setting packer and a mechanical setting packer are respectively arranged at the upper end and the lower end of the oil pipe, four groups of cavities are respectively arranged in the hydraulic setting packer and the mechanical setting packer, and the cavities are communicated with the oil pipe. And sealing-enhancing wear-resisting mechanisms are arranged in the four groups of cavities. The hydraulic setting packer and the mechanical setting packer are arranged on the oil pipe in a layered mode, the structure is simple, after-treatment of failure is simple, and repeatability and modifiability are achieved; four sets of cavities composed of arc cavities and arc grooves are formed in the hydraulic setting packer and the mechanical setting packer, and sealing-increasing wear-resisting mechanisms are arranged in the cavities, so that the main arc plate and the auxiliary arc plate can be flexibly adjusted in a telescopic mode according to requirements, meanwhile, the sealing performance of the main arc plate and the auxiliary arc plate in contact with the inner wall of an oil well is enhanced, and the wear-resisting strength is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of integrated negative pressure oil production technology, and in particular to a tubing string with double packers for sealing oil layers. Background Technology

[0002] In the later stages of oilfield development, multi-layer simultaneous production is common. However, when problems arise in some or all oil layers during this phase, it is necessary to seal or plug the problematic layers. Common methods include sealing the top layer while producing the bottom layer, sealing the bottom layer while producing the top layer, and cement sealing. Existing methods have several drawbacks: high cost, long operation cycle, short effective time, difficulty in post-treatment, and the potential for gaps to form between the packer and the wellbore wall, leading to gas leakage due to incomplete sealing. Furthermore, the uneven surface of the wellbore makes it easy for protruding gravel to cause severe wear to the packer, significantly shortening its service life. Utility Model Content

[0003] The purpose of this invention is to solve the problem of insufficient wear resistance and sealing performance of packers in the prior art, and to propose a tubing string with a double packer for sealing the oil layer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A tubing string for sealing an oil layer with dual packers includes tubing, with a hydraulically set packer and a mechanically set packer respectively installed at the upper and lower ends of the tubing. Both the hydraulically set packer and the mechanically set packer have four sets of cavities, and each of the four sets of cavities is equipped with a sealing and wear-resistant mechanism corresponding to the inner wall of the oil well.

[0006] Preferably, the cavity includes an arc cavity located inside the hydraulically set packer and the mechanically set packer, and the cavity also includes an arc groove located outside the hydraulically set packer and the mechanically set packer.

[0007] Preferably, the arc cavity and the arc groove are concentrically arranged, and the hydraulic setting packer and the mechanical setting packer correspond one-to-one.

[0008] Preferably, the wear-resistant sealing mechanism includes a load-bearing sleeve fixedly fitted in the arc cavity and communicating with the inside of the oil pipe, and a load-bearing inner tube extending into the arc groove is slidably fitted in the load-bearing sleeve. A main arc plate and a first piston are integrally connected to the load-bearing inner tube, and a first spring is fixedly connected between the first piston and the load-bearing sleeve.

[0009] The wear-resistant sealing mechanism also includes a load-bearing bracket fixedly installed inside the load-bearing sleeve, and a pump body fixedly installed on the load-bearing bracket. A corrugated hose that extends movably into the load-bearing inner tube is fixedly installed at the output end of the pump body. A central arc hole is opened at the middle position of the main arc plate, and receiving arc chambers that connect to the central arc hole are symmetrically opened at both ends of the main arc plate. A telescopic crank is slidably fitted in the central arc hole and the receiving arc chamber. A second piston and a secondary arc plate are fixedly installed at both ends of the telescopic crank, and a second spring is fixedly connected between the second piston and the main arc plate.

[0010] Preferably, the main arc plate is fixedly connected to the outer end of the load-bearing inner tube located in the arc groove, and the first piston is fixedly connected to the inner end of the load-bearing inner tube located in the arc cavity.

[0011] Preferably, the load-bearing bracket and the pump body are installed in the inner end of the load-bearing sleeve leading to the oil pipe, and the corrugated hose is fixedly inserted through the first piston.

[0012] Preferably, the second piston is installed on one end of the telescopic crank located in the central arc hole, and the auxiliary arc plate is installed on the other end of the telescopic crank located in the receiving arc chamber.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. This utility model features a hydraulic setting packer and a mechanical setting packer arranged in layers on the oil pipe. It has a simple structure, is easy to construct, shortens the operation time, reduces the operation cost, has a long effective sealing time, and is easy to handle after failure. It also has repeatability and modifiability.

[0015] 2. This utility model provides four sets of cavities composed of arc cavities and arc grooves in the hydraulic setting packer and the mechanical setting packer, and sets a sealing and wear-resistant mechanism in the cavities, so that the main arc plate and the auxiliary arc plate can be flexibly extended and retracted according to the needs, while enhancing the sealing performance in contact with the inner wall of the oil well and ensuring wear resistance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a tubing column for sealing an oil layer with a double packer, as proposed in this utility model.

[0017] Figure 2 This is a front sectional view of a tubing string with a double packer sealing the oil layer according to the present invention;

[0018] Figure 3 This is an enlarged schematic diagram of part A of the tubing column for sealing the oil layer with a double packer, as proposed in this utility model.

[0019] Figure 4 This is a top cross-sectional view of a tubing string with a double packer for sealing the oil layer, as proposed in this utility model.

[0020] Figure 5 This is an enlarged schematic diagram of part B of a tubing column for sealing an oil layer with a double packer, as proposed in this utility model.

[0021] In the diagram: 1. Oil pipe; 2. Hydraulic setting packer; 3. Mechanical setting packer; 4. Arc cavity; 5. Arc groove; 6. Load-bearing sleeve; 7. Load-bearing inner tube; 8. Main arc plate; 9. First piston; 10. First spring; 11. Load-bearing bracket; 12. Pump body; 13. Corrugated hose; 14. Central arc hole; 15. Arc storage chamber; 16. Telescopic crank; 17. Second piston; 18. Second spring; 19. Secondary arc plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figures 1-5 A tubing string with dual packers for sealing oil layers includes an oil tubing 1, with a hydraulically set packer 2 and a mechanically set packer 3 installed above and below the oil tubing 1, respectively. The length of the oil tubing 2 is determined based on actual data from the construction site to ensure that the hydraulically set packer 1 and the mechanically set packer 3 cover all the sealed oil layers. It should be noted that the hydraulically set packer 2 is a Y445 packer, which can be dropped or retrieved, while the mechanically set packer 3 is a Y221 packer or a Y211 packer, and the unsealing method is to lift the tubing string to unseal it.

[0024] Please refer to the instruction manual for details. Figure 4 Both the hydraulic setting packer 2 and the mechanical setting packer 3 have four sets of cavities, and each of the four sets of cavities is equipped with a sealing and wear-resistant mechanism to facilitate the installation of circumferentially equidistant main arc plates 8 and secondary arc plates 19, thereby increasing the sealing between the hydraulic setting packer 2, the mechanical setting packer 3 and the inner wall of the oil well, and preventing direct contact between the hydraulic setting packer 2, the mechanical setting packer 3 and the inner wall of the oil well.

[0025] The cavity includes an arc cavity 4 located inside the hydraulically set packer 2 and the mechanically set packer 3, and also includes an arc groove 5 located outside the hydraulically set packer 2 and the mechanically set packer 3. The arc cavity 4 and the arc groove 5 are concentrically arranged, and the hydraulically set packer 2 and the mechanically set packer 3 correspond one-to-one. The arc groove 5 is located on the periphery of the arc cavity 4.

[0026] The wear-resistant sealing mechanism includes a load-bearing sleeve 6 fixedly fitted in the arc cavity 4 and connected to the inside of the oil pipe 1. It should be noted that the oil pipe 1 has an opening corresponding to the inner end of the load-bearing sleeve 6 to facilitate the input of gas into the load-bearing sleeve 6. The load-bearing inner tube 7 extending into the arc groove 5 is slidably fitted in the load-bearing sleeve 6. The main arc plate 8 and the first piston 9 are integrally connected to the load-bearing inner tube 7. The first spring 10 is fixedly connected between the first piston 9 and the load-bearing sleeve 6. The first spring 10 is a tension spring. In the initial state, it causes the load-bearing inner tube 7 to retract into the load-bearing sleeve 6. When gas is input from the oil pipe 1 into the load-bearing sleeve 6, the load-bearing inner tube 7 extends outward from the load-bearing sleeve 6.

[0027] The wear-resistant sealing mechanism also includes a load-bearing bracket 11 fixedly installed inside the load-bearing sleeve 6, and a pump body 12 fixedly installed on the load-bearing bracket 11. A corrugated hose 13 extending movably into the load-bearing inner tube 7 is fixedly installed at the output end of the pump body 12. It should be noted that the corrugated hose 13 can flexibly accommodate the extension and retraction of the load-bearing inner tube 7. Regardless of the extension and retraction of the load-bearing inner tube 7, gas can be introduced into or extracted from the load-bearing inner tube 7 through the corrugated hose 13. A central arc hole 14 is provided at the middle position of the main arc plate 8, and... The main arc plate 8 has symmetrically arranged arc storage chambers 15 at both ends, which are connected to the central arc hole 14. Telescopic crank rods 16 are slidably fitted in the central arc hole 14 and the arc storage chambers 15. A second piston 17 and a secondary arc plate 19 are fixedly installed at both ends of the telescopic crank rod 16, and a second spring 18 is fixedly connected between the second piston 17 and the main arc plate 8. The second spring 18 is a tension spring. In the initial state, the secondary arc plate 19 is stored in the arc storage chamber 15. When the second piston 17 is pressurized by gas, the secondary arc plate 19 can extend out of the arc storage chamber 15.

[0028] The main arc plate 8 and the load-bearing inner tube 7 are fixedly connected at their outer ends in the arc groove 5, and the first piston 9 is fixedly connected at their inner ends in the arc cavity 4. By driving the load-bearing inner tube 7 to extend and retract, the main arc plate 8 can achieve the extension and retraction movement in the arc groove 5.

[0029] The load-bearing bracket 11 and the pump body 12 are installed in the inner end of the load-bearing sleeve 6 leading to the oil pipe 1, and the corrugated hose 13 is fixedly inserted through the first piston 9, and the first piston 9 has an opening for fitting the corrugated hose 13.

[0030] The second piston 17 is installed on one end of the telescopic crank 16 located in the central arc hole 14, and the auxiliary arc plate 19 is installed on the other end of the telescopic crank 16 located in the receiving arc chamber 15. The extension and retraction adjustment of the auxiliary arc plate 19 can be achieved by adjusting the air pressure inside the load-bearing inner tube 7 and the main arc plate 8.

[0031] It should be noted that the specific models and specifications of the oil pipe 1, hydraulic setting packer 2, and mechanical setting packer 3 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated here.

[0032] The functional principle of this utility model can be explained through the following operation methods:

[0033] Confirm the length of oil pipe 1 based on actual data from the construction site to ensure that hydraulic setting packer 2 and mechanical setting packer 3 cover all the stuck oil layers;

[0034] After the sealing string is lowered to the design depth, the oil pipe 1 is pressurized to set the mechanically set packer 3. Then, the oil pipe 1 is inserted into the matching steel ball of the hydraulically set packer 2. The oil pipe 1 is pressurized to set the hydraulically set packer 2. The oil pipe 1 continues to pressurize or rotates forward to release the hydraulically set packer 2, and the sealing is completed.

[0035] When it fails: Connect the lower hydraulic setting packer 2 to the top of the fish using the salvage short section, and lift the tubing string to release the seal and remove the stuck tubing string.

[0036] During this process;

[0037] First, gas is introduced into the load-bearing sleeve 6 through the oil pipe 1 to pressurize the first piston 9, causing the first spring 10 to contract under force, which in turn drives the main arc plate 8 to extend to the arc groove 5 through the load-bearing inner tube 7.

[0038] Secondly, gas is introduced into the load-bearing inner pipe 7 through the pump body 12 to pressurize the second piston 17, causing the second spring 18 to contract under force. This causes the auxiliary arc plate 19 to extend out of the receiving arc chamber 15 through the telescopic crank 16, until the main arc plate 8 and the auxiliary arc plate 19 come into contact with the inner wall of the oil well.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tubing string for sealing an oil layer with a double packer, comprising an oil tubing (1), characterized in that, The oil pipe (1) is provided with a hydraulic setting packer (2) and a mechanical setting packer (3) at its upper and lower ends, respectively. Both the hydraulic setting packer (2) and the mechanical setting packer (3) have four sets of cavities, and each of the four sets of cavities is provided with a sealing and wear-resistant mechanism.

2. The tubing string with a double packer sealing oil layer according to claim 1, characterized in that, The cavity includes an arc cavity (4) located inside the hydraulically set packer (2) and the mechanically set packer (3), and the cavity also includes an arc groove (5) located outside the hydraulically set packer (2) and the mechanically set packer (3).

3. The tubing string with a double packer sealing oil layer according to claim 2, characterized in that, The arc cavity (4) and the arc groove (5) are concentrically arranged, and the hydraulic seated packer (2) and the mechanical seated packer (3) correspond one-to-one.

4. The tubing string with a double packer sealing oil layer according to claim 3, characterized in that, The wear-resistant sealing mechanism includes a load-bearing sleeve (6) fixedly fitted in the arc cavity (4) and connected to the inside of the oil pipe (1), and a load-bearing inner tube (7) extending into the arc groove (5) is slidably fitted in the load-bearing sleeve (6). A main arc plate (8) and a first piston (9) are integrally connected on the load-bearing inner tube (7), and a first spring (10) is fixedly connected between the first piston (9) and the load-bearing sleeve (6). The wear-resistant sealing mechanism also includes a load-bearing bracket (11) fixedly installed in the load-bearing sleeve (6), and a pump body (12) fixedly installed on the load-bearing bracket (11). A corrugated hose (13) that extends movably into the load-bearing inner tube (7) is fixedly installed at the output end of the pump body (12). A central arc hole (14) is opened at the middle position of the main arc plate (8), and a receiving arc chamber (15) communicating with the central arc hole (14) is symmetrically opened at both ends of the main arc plate (8). A telescopic crank (16) is slidably fitted in the central arc hole (14) and the receiving arc chamber (15). A second piston (17) and a secondary arc plate (19) are fixedly installed at both ends of the telescopic crank (16), and a second spring (18) is fixedly connected between the second piston (17) and the main arc plate (8).

5. The tubing string with a double packer sealing oil layer according to claim 4, characterized in that, The main arc plate (8) is fixedly connected to the outer end of the load-bearing inner tube (7) located in the arc groove (5), and the first piston (9) is fixedly connected to the inner end of the load-bearing inner tube (7) located in the arc cavity (4).

6. The tubing string with a double packer sealing oil layer according to claim 4, characterized in that, The load-bearing bracket (11) and the pump body (12) are installed in the inner end of the load-bearing sleeve (6) leading to the oil pipe (1), and the corrugated hose (13) is fixedly inserted through the first piston (9).

7. The tubing string with a double packer sealing oil layer according to claim 4, characterized in that, The second piston (17) is installed on one end of the telescopic crank (16) located in the central arc hole (14), and the auxiliary arc plate (19) is installed on the other end of the telescopic crank (16) located in the storage arc chamber (15).

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