Packer capable of improving upper pressure bearing capacity

Abstract

The invention relates to the technical field of oil exploitation, in particular to a packer capable of improving the upper pressure bearing capacity, and aims to solve the problem that the setting force of the packer is insufficient when the upper layer of the packer is constructed. The device comprises an upper joint, a first central pipe, a second central pipe and a rubber sleeve, the first central pipe is inserted into the second central pipe; the upper connector is sequentially connected with the first center pipe and the second center pipe in a sleeved mode. The rubber sleeve is sleeved with the second central pipe and is propped against the upper joint; a first liquid channel communicated with an external pipe in series is arranged between the first central pipe and the second central pipe; a second liquid channel communicated with the upper pipe series is arranged in the first central pipe; the first liquid channel and the second liquid channel can apply pressure to the lower portion of the rubber sleeve, so that the rubber sleeve is expanded, the rubber sleeve obtains sufficient setting force all the time, and the sealing effect is maintained.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a packer that improves the ability to withstand pressure. Background Technology

[0002] Packers are commonly used for interlayer sealing in oil and gas well fracturing, acidizing, and other operations. As a key tool for interlayer sealing, the sealing effect of packers is crucial to the success or failure of the operation.

[0003] The packers currently in use have a single setting inlet. Setting is achieved by pressurizing through the inlet, and the packer is then locked in place by a locking mechanism. When working below the packer, pressure is transmitted through the setting inlet to the thrust piston on the packer sleeve, which then applies force to the sleeve, maintaining sufficient setting force. However, when working above the sleeve, the pressure cannot be transmitted to the setting inlet due to the presence of a sliding sleeve and a temporary plug ball within the tubing. The packer's setting force is then fixed, and if the pressure at the top of the packer increases, it will face loss of seal, leading to construction failure. Summary of the Invention

[0004] This invention provides a packer with improved ability to withstand pressure, thereby alleviating the problem of insufficient packer setting force during upper layer construction.

[0005] To alleviate the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The present invention provides a packer with improved ability to withstand pressure, comprising an upper connector, a first central tube, a second central tube, and a rubber sleeve;

[0007] The first central tube and the second central tube are connected together;

[0008] The upper connector is sequentially sleeved with the first central tube and the second central tube;

[0009] The rubber sleeve is connected to the second central tube and abuts against the upper connector;

[0010] There is a first liquid channel between the first central tube and the second central tube, which is connected in series with an external tube;

[0011] The first central tube has a second liquid channel that is connected to the upper tube;

[0012] The first liquid channel and the second liquid channel can respectively apply pressure to the lower part of the rubber tube, causing the rubber tube to expand.

[0013] Furthermore,

[0014] Includes the thrust piston and the separator ring;

[0015] The thrust piston and the separator ring are sequentially sleeved onto the second central tube from top to bottom;

[0016] The second central tube, the thrust piston and the separator ring have a first liquid storage chamber;

[0017] The upper connector has a first pressure-transmitting hole that communicates with the first liquid channel;

[0018] The first liquid storage chamber and the first liquid channel are connected by a second pressure transmission hole.

[0019] Furthermore,

[0020] Including the locking piston;

[0021] The locking piston is sleeved with the first central tube and threadedly connected to the thrust piston;

[0022] A retaining ring is provided on the upper part of the locking piston;

[0023] The retaining ring is sleeved with the first central tube and threadedly connected to the thrust piston;

[0024] A second liquid storage chamber is located between the first central tube, the locking piston, and the retaining ring;

[0025] The first central tube and the second liquid storage chamber are connected by a third pressure transmission hole.

[0026] Furthermore,

[0027] Including clipper nails;

[0028] The shear pin is inserted into the locking piston and snapped into the first central tube.

[0029] Furthermore,

[0030] Including locking rings;

[0031] The locking ring is sleeved with the first central tube and engaged with the locking piston.

[0032] Furthermore,

[0033] A sealing gasket is provided between the retaining ring, the thrust piston, and the locking piston.

[0034] Furthermore,

[0035] The rubber tube includes a first rubber tube and a second rubber tube;

[0036] The first and second rubber tubes are connected by a spacer ring.

[0037] Furthermore,

[0038] Including sealing rings;

[0039] The sealing ring is located at the connection between the separator ring and the second central tube and the thrust piston, as well as at the connection between the second central tube and the first central tube, the thrust piston, and the retaining ring.

[0040] The beneficial effects of this invention are analyzed as follows:

[0041] When constructing the lower layer of the packer, the liquid in the second liquid channel provides sufficient setting force to the rubber sleeve. When constructing the upper layer of the packer, the construction pressure is used to transmit the pressure to the lower part of the rubber sleeve through the first liquid channel, providing sufficient setting force to the rubber sleeve. The first liquid channel and the second liquid channel, as two independent channels, can provide setting force to the rubber sleeve respectively, thereby ensuring that the rubber sleeve always has sufficient setting force to maintain the sealing effect. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure before the packer is set.

[0044] Figure 2 This is a partially enlarged schematic diagram of the packer before setting;

[0045] Figure 3 This is a partially enlarged schematic diagram of the packer after it has been set.

[0046] icon:

[0047] 100 - Upper connector; 110 - First pressure transmission hole;

[0048] 200 - First central tube; 210 - Second liquid channel; 220 - Second liquid storage chamber; 230 - Third pressure transmission hole;

[0049] 300 - Second central tube; 310 - First liquid channel; 320 - First liquid storage chamber; 330 - Second pressure transmission hole;

[0050] 400 - Glue cartridge; 410 - Spacer ring;

[0051] 500-Thrust Piston;

[0052] 600-Separator ring;

[0053] 700 - Locking piston; 710 - Retaining ring; 720 - Sealing gasket;

[0054] 800-Cut staples;

[0055] 900-locking ring. Detailed Implementation

[0056] The packer currently in use has a single setting inlet. The packer is set by pressurizing the inlet. After the packer is set, it is locked by a locking mechanism. It works well when working on layers below the packer, but when working on layers above the packer, if the pressure in the working area increases, the packer is prone to failure, which can lead to construction failure.

[0057] In view of this, such as Figures 1 to 3 As shown, this solution provides a packer with improved ability to withstand pressure, including an upper connector 100, a first central tube 200, a second central tube 300, and a rubber sleeve 400;

[0058] The first central tube 200 and the second central tube 300 are connected;

[0059] The upper connector 100 is sequentially connected to the first central tube 200 and the second central tube 300;

[0060] The rubber sleeve 400 is sleeved with the second central tube 300 and abuts against the upper connector 100;

[0061] A first liquid channel 310, which is connected in series with an external pipe, is provided between the first central pipe 200 and the second central pipe 300.

[0062] The first central tube 200 has a second liquid channel 210 that is connected in series with the upper tube;

[0063] The first liquid channel 310 and the second liquid channel 210 can respectively apply pressure to the lower part of the rubber tube 400, causing the rubber tube 400 to expand.

[0064] The outlet directions of both the first liquid channel 310 and the second liquid channel 210 are located at the lower part of the rubber sleeve 400. When constructing the lower layer of the packer, by injecting liquid into the second liquid channel 210 and pressurizing it, the pressure can be directly applied to the lower part of the rubber sleeve 400, pushing the rubber sleeve 400 to move upward. The upper part of the rubber sleeve 400 abuts against the upper connector 100, causing the rubber sleeve 400 to expand laterally, filling the sleeve annulus and separating the upper and lower parts of the sleeve. When constructing the upper layer of the packer, the construction pressure is transmitted to the thrust piston 500 through the first liquid channel 310, so that the rubber sleeve 400 always obtains sufficient setting force, thereby ensuring the reliability of the rubber sleeve seal.

[0065] Regarding the principle that the rubber sleeve 400 always has sufficient setting force when constructing on the upper layer of the packer, such as... Figure 1 and Figure 3 As shown:

[0066] Includes thrust piston 500 and separator ring 600;

[0067] The thrust piston 500 and the separator ring 600 are sequentially sleeved onto the second central tube 300 from top to bottom;

[0068] A first liquid storage chamber 320 is provided between the second central tube 300, the thrust piston 500 and the separator ring 600;

[0069] The upper connector 100 has a first pressure transmission hole 110 communicating with the first liquid channel 310;

[0070] The first liquid storage chamber 320 and the first liquid channel 310 are connected by the second pressure transmission hole 330.

[0071] Specifically, when using a packer for setting, the operation is carried out in the order of first working on the lower layer of the packer and then working on the upper layer of the packer. Before working on the upper part of the packer, liquid has been injected and pressurized into the lower part of the rubber sleeve 400 through the second liquid channel 210 to make the rubber sleeve 400 set. At this time, liquid is injected into the first liquid channel 310 through the first pressure transmission hole 110. The liquid flows from the second pressure transmission hole 330 to the first liquid storage chamber 320 and acts directly on the lower part of the rubber sleeve 400, so that the rubber sleeve 400 always has sufficient setting force.

[0072] The outer wall of the separator ring 600 is slidably connected to the thrust piston 500, and the inner wall is fixedly connected to the second central tube 300. When the liquid enters the first liquid storage chamber 320, the pressure can directly push the thrust piston 500 upward, so that the rubber sleeve 400 obtains sufficient setting force.

[0073] Regarding the principle that the 400 rubber sleeve always has sufficient setting force when constructing below the packer, such as... Figure 2 and Figure 3 As shown:

[0074] Including locking piston 700;

[0075] The locking piston 700 is sleeved with the first central tube 200 and threadedly connected to the thrust piston 500;

[0076] A retaining ring 710 is provided on the upper part of the locking piston 700;

[0077] The retaining ring 710 is sleeved with the first central tube 200 and threadedly connected to the thrust piston 500;

[0078] A second liquid storage chamber 220 is provided between the first central tube 200, the locking piston 700 and the retaining ring 710;

[0079] The first central tube 200 and the second liquid storage chamber 220 are connected through the third pressure transmission hole 230;

[0080] Includes 800 clippers;

[0081] The shear pin 800 is inserted into the locking piston 700 and snapped into the first center tube 200;

[0082] Including locking ring 900;

[0083] The locking ring 900 is sleeved with the first central tube 200 and engaged with the locking piston 700.

[0084] Specifically, after the packer is lowered to the designed position along with the tubing string, the tubing string begins to inject fluid and pressurize the second fluid channel 210. The fluid enters the second storage chamber 220 through the third pressure transmission hole 230 and applies pressure to the retaining ring 710. When the pressure exceeds the bearing capacity of the shear pin 800, the shear pin 800 breaks, and the locking piston 700, the retaining ring 710, and the thrust piston 500 move upward together, applying pressure to the bottom of the rubber sleeve 400. The outer wall of the locking ring 900 is fixedly connected to the locking piston 700, and the inner wall is movably connected to the first central tube 200. The locking ring 900 is installed before being lowered into the well, such as... Figure 1 At the initial position, the first central tube 200 has a barbed structure that cooperates with the locking ring 900. The locking ring 900 can move upward together with the locking piston 700. After the setting is completed, the barbed structure on the locking ring 900 will lock onto the first central tube 200, so that the locking ring 900 cannot be pushed back to the initial position.

[0085] The upper part of the locking piston 700 is at a certain distance from the first central tube 200 to form the second liquid storage chamber 220, and the lower part is in contact with the first central tube 200 to prevent liquid from overflowing. More preferably, a sealing body can also be provided between the first central tube 200 and the locking piston 700. The sealing body is located at the lower part of the second liquid storage chamber 220, with one end fixedly connected to the first central tube 200 and the other end movably connected to the locking piston 700. This can prevent the downward force of the liquid from acting on the locking piston 700, thereby improving the setting force of the rubber sleeve 400 and also improving the sealing effect.

[0086] More preferably, one or more sets of first pressure transmission holes 110, second pressure transmission holes 330 and third pressure transmission holes 230 can be provided to increase the liquid injection speed and thus improve work efficiency.

[0087] A sealing gasket 720 is provided between the retaining ring 710, the thrust piston 500 and the locking piston 700.

[0088] like Figure 1 As shown, the glue cartridge 400 includes a first glue cartridge and a second glue cartridge;

[0089] The first and second rubber tubes are connected by a spacer ring 410.

[0090] Specifically, the sliding connection between the spacer ring 410 and the second central tube 300 can balance the setting force on the two rubber tubes, allowing the first rubber tube and the second rubber tube to obtain the same expansion effect, thereby increasing the contact area with the sleeve and further enhancing the setting effect.

[0091] like Figure 2 As shown, it includes a sealing ring;

[0092] Preferably, the sealing rings are provided at the connection between the separator ring 600 and the second central tube 300 and the thrust piston 500, and at the connection between the second central tube 300 and the first central tube 200, the thrust piston 500 and the retaining ring 710. One or more sets of sealing rings can be provided at each connection to maximize the sealing performance of the packer.

[0093] This solution has at least the following beneficial effects:

[0094] This solution provides a packer with improved pressure resistance. Through the design of the liquid channel and piston structure, sufficient setting force is maintained on the rubber sleeve 400 during both the lower and upper layers of the packer, ensuring the packer's reliability and sealing performance. Furthermore, the sealing performance is further enhanced by incorporating sealing rings and sealing bodies, ensuring stability and safety during construction. This improved packer design effectively addresses situations of increased pressure in the construction area, preventing packer failure and subsequent construction failure.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A packer with improved resistance to pressure, characterized in that: It includes an upper connector (100), a first central tube (200), a second central tube (300), and a rubber sleeve (400); The first central tube (200) is inserted into the second central tube (300); The upper connector (100) is sequentially sleeved with the first central tube (200) and the second central tube (300); The rubber sleeve (400) is sleeved with the second central tube (300) and abuts against the upper connector (100); The first central tube (200) and the second central tube (300) have a first liquid channel (310) that is connected in series with an external tube; The first central tube (200) has a second liquid channel (210) that is connected in series with the upper tube; The first liquid channel (310) and the second liquid channel (210) can respectively apply pressure to the lower part of the rubber tube (400) to cause the rubber tube (400) to expand.

2. The packer for improving the ability to withstand upward pressure according to claim 1, characterized in that: Includes a thrust piston (500) and a separator ring (600); The thrust piston (500) and the partition ring (600) are sequentially sleeved with the second central tube (300) from top to bottom; A first liquid storage chamber (320) is provided between the second central tube (300), the thrust piston (500) and the partition ring (600); The upper connector (100) has a first pressure-transmitting hole (110) communicating with the first liquid channel (310); The first liquid storage chamber (320) is connected to the first liquid channel (310) through the second pressure transmission hole (330).

3. The packer with improved pressure resistance according to claim 2, characterized in that: Including the locking piston (700); The locking piston (700) is sleeved with the first central tube (200) and threadedly connected to the thrust piston (500); A retaining ring (710) is provided on the upper part of the locking piston (700); The retaining ring (710) is sleeved with the first central tube (200) and threadedly connected to the thrust piston (500); A second liquid storage chamber (220) is provided between the first central tube (200), the locking piston (700), and the retaining ring (710); The first central tube (200) and the second liquid storage chamber (220) are connected through a third pressure transmission hole (230).

4. The packer with improved pressure resistance according to claim 3, characterized in that: Includes clippers (800); The shear pin (800) is inserted into the locking piston (700) and engaged with the first central tube (200).

5. The packer for improving the ability to withstand upward pressure according to claim 4, characterized in that: Includes locking ring (900); The locking ring (900) is sleeved with the first central tube (200) and engaged with the locking piston (700).

6. The packer for improving the ability to withstand upward pressure according to claim 5, characterized in that: A sealing gasket (720) is provided between the retaining ring (710), the thrust piston (500), and the locking piston (700).

7. The packer with improved pressure resistance according to claim 6, characterized in that: The rubber tube (400) includes a first rubber tube and a second rubber tube; The first rubber tube and the second rubber tube are connected by a spacer ring (410).

8. The packer for improving the ability to withstand upward pressure according to claim 7, characterized in that: Including sealing rings; The sealing ring is disposed at the connection between the separator ring (600) and the second central tube (300) and the thrust piston (500), and at the connection between the second central tube (300) and the first central tube (200), the thrust piston (500) and the retaining ring (710).

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