Packer pressure test rubber sleeve restraint device

Abstract

The utility model relates to a fluid sealing performance test of a structural component, in particular to a packer pressure test rubber sleeve restraining device which comprises a radial limiting sleeve used for being arranged on a rubber sleeve of a packer in a sleeved mode to limit the deformation quantity of the rubber sleeve from the periphery, and hoops are arranged at the two ends of the radial limiting sleeve respectively. The hoop is used for fixing a corresponding piston sleeve of the packer, and a supporting matching face used for being matched with the limiting sleeve is arranged at the end, close to the radial limiting sleeve, of the hoop. According to the utility model, the problems that only the low-pressure sealing performance in a packer cavity can be tested and the effectiveness of a packer setting system under a high-pressure condition after entering a well cannot be ensured when the packer is subjected to a pressure test on the ground are solved.

Description

Technical Field

[0001] The utility model relates to a test of the fluid tightness of a structural component, in particular to a packer pressure test rubber tube restraint device. Background Art

[0002] Packers are important tools for oil and gas field exploitation. They are often used in oil production wells and water injection wells in oil fields, providing effective mechanical means for the smooth production of oil and gas wells or water injection wells, and occupy a very important position in the exploration and development of oil and gas fields.

[0003] "Basics of Downhole Operation Construction Technology" (Wang Xinchun. [M] Beijing, Petroleum Industry Press, ISBN978-7-5021-5048-8, 2005) Pages 143-144 disclose the structure and working principle of the Y-type packer: The Y-type packer is composed of an upper joint, an O-ring, a piston sleeve, a vulcanized core, a rubber tube, a central tube and other parts, wherein the piston sleeve is fixedly connected to the rubber tube and fixed to the central tube by shear pins. When the packer is in the packing position, hydraulic pressure is added from the oil pipe, and the hydraulic pressure enters the piston cavity through the upper and lower central tube holes. Under the action of the hydraulic pressure, the piston sleeve is pushed to cut the pin, and the rubber tube is stretched outward to seal the oil and sleeve annular space.

[0004] Before the packer is put into the well, the sealing performance needs to be pressure tested to ensure that the packer can be set smoothly after being lowered into the well, and the annular space of the casing can be isolated to protect the casing. During the pressure test, one end of the packer needs to be connected to the plug, and the other end needs to be connected to the variable buckle joint with the pressure test pipeline. The inner cavity of the packer needs to be pressure tested using a pressure test pump. After stopping the pressurization, if the pressure remains unchanged, it means that the packer has good sealing performance. If the pressure drops, it means that the packer is not tightly sealed.

[0005] However, in order to avoid the rubber cylinder being squeezed and damaged by the piston sleeve due to excessive hydraulic pressure in the packer during the pressure test, and to prevent the shear nails from being cut off, only a pressure lower than the starting pressure of the packer is introduced into the packer during the pressure test (the starting pressure of the packer is about 4-8MPa. In order to avoid damage to the packer, the overall low pressure of the inner cavity of the packer is generally tested at 2-3MPa). It cannot be guaranteed that the sealing system of the packer after entering the well is effective under high pressure conditions. Utility Model Content

[0006] The utility model aims to provide a pressure test rubber tube restraint device for a packer, so as to solve the problem that in a high-pressure test, the rubber tube of the packer will be squeezed and damaged by a piston sleeve, making it impossible to perform high-pressure verification and ensuring that the sealing of the sealing system is effective under high-pressure conditions after the packer enters the well.

[0007] In order to achieve the above-mentioned purpose, a packer pressure test rubber cylinder restraint device of the utility model adopts the following technical scheme:

[0008] A pressure test rubber cylinder restraint device for a packer, the restraint device comprising a radial limit sleeve for being sleeved on the rubber cylinder of the packer and limiting the deformation of the rubber cylinder from the periphery, clamps are respectively provided at both ends of the radial limit sleeve, the clamps are used to fix the corresponding piston sleeve of the packer, and one end of the clamp close to the radial limit sleeve is provided with a supporting mating surface for cooperating with the limit sleeve.

[0009] Beneficial effects: The utility model is a pioneering invention. The utility model includes a radial limit sleeve that can be sleeved on the rubber cylinder to limit the shape variation of the rubber cylinder. Clamps for fixing the piston sleeve of the packer are provided at both ends of the limit sleeve, and a support mating surface for cooperating with the radial limit sleeve is provided at one end of the clamp close to the radial limit sleeve. During high-pressure testing, the cooperation of the radial limit sleeve, the clamp and the support mating surface of the clamp not only prevents the sealing components on both sides of the rubber cylinder from squeezing the rubber cylinder during the pressure test to protect the rubber cylinder, but also performs an internal cavity high-pressure inspection according to the actual internal pressure index of the packer to verify the sealing of the packer under high-pressure environment after entering the well. At the same time, it can also prevent the packer sealing shear nails from being damaged during high-pressure testing, ensure the safety of the packer during entering the well, and reduce the risk of mis-sealing.

[0010] Furthermore, the radial limiting sleeve comprises an upper limiting sleeve and a lower limiting sleeve, the upper limiting sleeve and the lower limiting sleeve form a telescopic sleeve, and an axial locking structure is arranged between the upper limiting sleeve and the lower limiting sleeve.

[0011] Furthermore, the upper limit sleeve is threadedly connected to the lower limit sleeve, and the threads therebetween form the axial locking structure.

[0012] Furthermore, one of the upper limit sleeve and the lower limit sleeve is installed in the other to form an inner sleeve, and the other forms an outer sleeve, and an annular step opposite to the corresponding end of the other is provided on the outer wall of one end of the inner sleeve.

[0013] Furthermore, the annular step is formed by expanding the corresponding end of the inner sleeve.

[0014] Furthermore, both ends of the radial limiting sleeve are respectively provided with plug-in positioning sections for plugging with corresponding clamps.

[0015] Furthermore, the opening of the clamp is connected by a locking bolt.

[0016] Furthermore, an end of the clamp away from the radial limiting sleeve is provided with an inner clamping edge for clamping the annular groove between the outer center tube of the packer and the rubber sleeve.

[0017] Furthermore, the side surface of the inner clamping edge close to the radial limiting sleeve is an inclined surface, and the inclined surface is consistent with the corresponding side groove wall of the annular groove between the outer center tube of the packer and the rubber sleeve.

[0018] Furthermore, the clamp comprises two half-ring clamps which are hingedly connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 for Figure 1 A top view of

[0021] Figure 3 It is a schematic diagram of the working state of the utility model.

[0022] Figure 1-3 Middle: 1. Upper clamp; 11. Half-ring clamp; 12. Inner clamp edge of upper clamp; 2. Radial limit sleeve; 21. Upper limit sleeve; 22. Lower limit sleeve; 3. Lower clamp; 31. Inner clamp edge of lower clamp; 4. Rotating shaft; 5. Locking bolt; 6. Packer; 61. Outer center pipe; 62. Rubber sleeve; 63. Press ring; 7. Shoulder; 8. Step surface. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] The specific implementation of the packer pressure test rubber cylinder restraint device of the utility model is as follows:

[0025] The packer is an important tool for oilfield exploitation. It has the function of isolating the upper and lower annular channels of the target layer underground. Before the packer is put into the well, the sealing performance of the packer needs to be pressure tested. The general testing method is to connect one end of the packer to the plug and the other end to the variable buckle joint with the pressure test pipeline, and then use the pressure test pump to pressure test the inner cavity of the packer.

[0026] However, in order to prevent the packer setting rubber tube from being squeezed and damaged by the piston sleeve during high-pressure testing and the setting shear nail performance from being damaged, the inner cavity of the packer is generally only tested at low pressure, and it is impossible to ensure whether the sealing of the packer setting system is effective under high pressure after entering the well. In view of the above problems, the utility model designs a packer pressure test rubber tube constraint device. The core concept of the scheme is that a radial limit sleeve for limiting the shape variable of the rubber tube is mounted on the rubber tube, and clamps for fixing the packer piston sleeve are arranged at both ends of the radial limit sleeve.

[0027] Based on the above invention concept, Figure 1 In a specific embodiment shown, the packer pressure test rubber tube restraint device includes a radial limit sleeve 2 and a clamp.

[0028] Specifically, Figure 1-3 As shown, the radial limiting sleeve 2 is used to limit the deformation of the rubber sleeve 62 , and clamps are provided at both ends of the radial limiting sleeve 2 , and the clamps are used to fix the corresponding piston sleeves of the packer 6 .

[0029] like Figure 1 As shown, one end of the clamp close to the radial limiting sleeve 2 is provided with a supporting mating surface for mating with the limiting sleeve 2, and both ends of the radial limiting sleeve 2 are provided with plug-in positioning sections for plugging with the corresponding clamp.

[0030] Specifically, both ends of the adjustment sleeve 2 are provided with a step surface 8, and the upper and lower clamps are provided with shoulders 7 corresponding to the step surface 8. Through the cooperation of the shoulders 7 and the step surface 8, not only can the upper and lower clamps be quickly assembled on the radial adjustment sleeve 2, but also the overall structural strength of the anti-slip device can be improved, providing a better protection effect for the rubber cylinder 62. In other embodiments, other matching devices such as bosses and grooves or buckles and slots for supporting, positioning, and increasing structural strength can also be used.

[0031] like Figure 1 As shown, the radial limiting sleeve 2 is composed of an upper limiting sleeve 21 and a lower limiting sleeve 22 .

[0032] Specifically, one of the upper limit sleeve 21 and the lower limit sleeve 22 is installed in the other, thereby forming an inner sleeve, and the other is an outer sleeve. In this embodiment, the upper adjustment sleeve 21 is an outer sleeve, and the lower adjustment sleeve 22 is an inner sleeve. The outer wall of one end of the lower adjustment sleeve 22 is provided with an annular step for positioning the upper adjustment sleeve 21, and the annular step is formed by the expansion of the threaded bottom end of the lower adjustment sleeve 22. In other embodiments, a boss, a slot or other positioning device for the corresponding end of the other inner sleeve can also be used on the outer wall of one end of the inner sleeve. Similarly, in this embodiment, in order to facilitate the application to the packer 6 of different lengths of the rubber cylinder 62, the inner sleeve and the outer sleeve are telescopic sleeve structures, but in other embodiments, there is no need to stick to this. The radial limit sleeve 2 can also be an integrated type, which is only used for testing the same style of packer.

[0033] like Figure 1 As shown, the upper limit sleeve 21 is connected to the lower limit sleeve 22 by threads.

[0034] Specifically, an axial locking structure is provided between the upper limit sleeve 21 and the lower limit sleeve 22, and the axial locking structure is the thread between the upper limit sleeve 21 and the lower limit sleeve 22. In other embodiments, the upper limit sleeve and the lower limit sleeve can also be slidably matched. At this time, a row of corresponding holes can be arranged axially on the two, and the length of the radial limit sleeve can be adjusted by inserting pins in different holes. At this time, the pins and the holes constitute an axial locking structure.

[0035] like Figure 2 As shown, the clamp is divided into an upper clamp 1 and a lower clamp 3, and both the upper and lower clamps are formed by hingedly connecting two half-ring clamps 11.

[0036] Specifically, when the half-ring clamp 11 is buckled, the opening on one side of the half-ring clamp 11 is connected by the rotating shaft 4, and the opening on the other side is connected by the locking bolt 5. In other embodiments, screws, latches and other fixing parts can also be used instead.

[0037] like Figure 2 As shown, one end of the clamp away from the radial limiting sleeve 2 is provided with an inner clamping edge for clamping the annular groove between the outer center pipe 61 of the packer and the rubber sleeve 62.

[0038] Specifically, the end of the upper clamp 1 away from the radial limiting sleeve 2 is provided with a corresponding upper clamp inner edge 12, and similarly, the lower clamp 3 is provided with a lower clamp inner edge 31. The inner edge of the clamp enables the clamp to be installed on the outer center pipe 61 of the packer 6 and the pressure ring 63, preventing the clamp from moving relative to the center pipe. In this embodiment, in order to facilitate the installation of the clamp on the pressure ring 63, the side surface of the inner edge close to the radial limiting sleeve 2 is set as an inclined surface, and the inclined surface is in contact with the corresponding side groove wall of the annular groove between the outer center pipe 61 of the packer and the rubber tube 62. In other embodiments, the inner edge can be designed as any matching surface without restriction.

[0039] The following describes the packer pressure test process in combination with the above embodiments:

[0040] Before the pressure test, the radial limit sleeve 2 is put from top to bottom onto the rubber sleeve 62 position on the packer 6, and the upper clamp 1 is clamped at the outer center tube 61 of the packer 6, so that the inner clamping edge 12 of the upper clamp is in contact with the outer center tube 61; then the lower clamp 3 is clamped at the pressure ring 63 of the packer 6, so that the inner clamping edge 31 of the lower clamp is in contact with the pressure ring 63, and finally, the radial limit sleeve 2 is rotated so that the insertion and positioning end of the radial limit sleeve 2 corresponds to the supporting matching surfaces of the upper clamp 1 and the lower clamp 3, and the installation of the device is completed at this time.

[0041] During the pressure test, the upper end of the packer 6 is connected to high-pressure water through a reducer, and the lower end is sealed with a wire plug. After the pressurization is stopped, if the pressure remains unchanged, the packer has good sealing. If the pressure drops, it means that the packer 6 is not tightly sealed. During the pressure test, the utility model is mounted outside the rubber cylinder 62. Through the cooperation of the upper and lower clamps and the radial limit sleeve 2 of the utility model, the piston sleeves on both sides of the rubber cylinder 62 are prevented from squeezing the rubber cylinder 62, avoiding the replacement of the rubber cylinder 62 and the sealing ring, and greatly reducing the operation of the staff.

Claims

1. A packer pressure test rubber tube restraint device, characterized in that: The restraint device includes a radial limit sleeve for being sleeved on the rubber sleeve of the packer to limit the shape variation of the rubber sleeve from the periphery. Clamps are respectively provided at both ends of the radial limit sleeve. The clamps are used to fix the corresponding piston sleeve of the packer. The end of the clamp close to the radial limit sleeve is provided with a supporting mating surface for cooperating with the limit sleeve.

2. The packer pressure test rubber tube restraint device according to claim 1, characterized in that: The radial limiting sleeve comprises an upper limiting sleeve and a lower limiting sleeve, wherein the upper limiting sleeve and the lower limiting sleeve form a telescopic sleeve, and an axial locking structure is arranged between the upper limiting sleeve and the lower limiting sleeve.

3. The packer pressure test rubber tube restraint device according to claim 2 is characterized in that: The upper limit sleeve is threadedly connected to the lower limit sleeve, and the threads therebetween form the axial locking structure.

4. The packer pressure test rubber tube restraint device according to claim 3 is characterized in that: One of the upper limit sleeve and the lower limit sleeve is installed in the other to form an inner sleeve, and the other forms an outer sleeve. An annular step opposite to the corresponding end of the other is provided on the outer wall of one end of the inner sleeve.

5. The packer pressure test rubber tube restraint device according to claim 4, characterized in that: The annular step is formed by expanding the corresponding end of the inner sleeve.

6. The packer pressure test rubber tube restraint device according to claim 1, characterized in that: Both ends of the radial limiting sleeve are respectively provided with plug-in positioning sections for plugging with corresponding clamps.

7. The packer pressure test rubber tube restraint device according to claim 1, 2 or 3, characterized in that: The opening of the clamp is connected by a locking bolt.

8. The packer pressure test rubber tube restraint device according to claim 7, characterized in that: An end of the clamp away from the radial limiting sleeve is provided with an inner clamping edge for clamping the annular groove between the outer center tube of the packer and the rubber cylinder.

9. The packer pressure test rubber tube restraint device according to claim 8, characterized in that: The side surface of the inner clamping edge close to the radial limiting sleeve is an inclined surface, and the inclined surface is consistent with the corresponding side groove wall of the annular groove between the outer center tube of the packer and the rubber sleeve.

10. The packer pressure test rubber tube restraint device according to claim 1, characterized in that: The clamp comprises two half-ring clamps which are hingedly connected.

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