CN201650207U - High temperature resistant packer with automatic return capability - Google Patents

Abstract

The utility model relates to a packer used for acidizing and fracturing in oil and gas fields, in particular a high-temperature-resistant packer with automatic return capability, which is characterized in that it at least includes an upper joint, a first center pipe, a slip seat collar, a second Center pipe, upper center collar, third center pipe, lower center collar, and lower joint. The upper joint is connected to the threaded upper end of the first central pipe through a screw thread. The end of the upper joint is close to the trapezoidal packing. The end sleeve has a pressure cap, the lower end of the first center tube, the slip seat collar, the second center tube, the upper center collar, the third center tube, the lower center collar, and the lower joint are connected to each other; one end of the upper joint is processed with oil pipe threads , can be connected with tubing or downhole tools processed with tubing threads, and the lower joint is sleeved with a lower joint centralizing cap. It provides a high-temperature-resistant packer with automatic return ability, which is not easy to be blocked in the middle of the drilling process, and the compression hydraulic cylinder can return well after the packer is unsealed.

Description

High temperature resistant packer with automatic return capability

technical field

The utility model relates to a packer used for acidizing and fracturing in oil and gas fields, in particular to a high-temperature-resistant packer with automatic return capability.

Background technique

At present, there are many types and models of downhole packers used for acidizing and fracturing gas wells, mainly including Y344 series packers and K344 series packers. From the effect of use, the two series of packers all have deficiencies. K344 series packers have low temperature resistance and low pressure, and are suitable for gas wells between 2000-3000M. The Y344 series packers have high temperature resistance and high pressure, and are suitable for gas wells above 3000M. However, the Y344 packer is prone to blockage and sealing phenomenon during the drilling process. The second is that the thrust compression fluid cylinder cannot return well after the packer is unsealed, so that the unsealed effect of the packer is not perfect.

Contents of the invention

The purpose of this utility model is to provide a kind of high temperature resistant packer with automatic return ability, which is not easy to be blocked in the middle of the drilling process, and the compression fluid cylinder can return well after the packer is unsealed. .

The purpose of this utility model is achieved in this way, the high temperature resistant packer with automatic return ability: it is characterized in that it at least includes an upper joint, a first center pipe, a slip seat collar, a second center pipe, an upper center joint hoop, the third center pipe, the lower center collar, the lower joint, the upper joint is connected to the upper end of the first central pipe thread through a threaded thread, the end of the upper joint is close to the trapezoidal packing, and the outer end of the trapezoidal packing is covered with a pressure cap. The lower end of the first center pipe, the slip seat collar, the second center pipe, the upper center collar, the third center pipe, the lower center collar, and the lower joint are connected to each other; one end of the upper joint is processed with oil pipe thread, which can be connected with oil pipe or processed Downhole tools with tubing threads are connected, and the lower joint is sleeved with a lower joint centralizing cap.

The bushing on the outside of the first central pipe is sequentially connected with the upper rubber tube, upper spacer ring, middle rubber tube, lower spacer ring, lower rubber tube and rubber tube seat of the packer. The return bushings are connected together and form a blocking step so that the cartridge seat cannot pass freely over the outer ring of the return bushing.

The rubber cylinder seat is connected with the anti-slip cylinder liner, the spring seat piston and the upper cylinder liner through threaded threads; a ring groove is processed on the upper part of the inner cavity of the anti-slip cylinder liner as a locking step for slips; one end of the slips It is placed on the collar of the slip seat through threaded screw connection, and the other end is stuck at the limit step of the ring groove processed on the upper part of the inner cavity of the anti-slip cylinder liner.

A spring seat is sleeved on the second central tube, and a spring is arranged in the spring seat.

The utility model has the advantages that: due to the addition of a return mechanism to the internal structure of the original Y344 series packers, the original Y344 series packers are freed from the original Y344 series packers. The phenomenon that the spacer is not completely unsealed at the end of the fracturing construction.

Description of drawings

The following is a further description of the high temperature resistant packer with automatic return capability of the present invention in conjunction with the accompanying drawings.

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Upper joint; 2. Pressure cap; 3. Trapezoidal packing; 4. First central tube; 5. Bushing; , Rubber cartridge seat; 10, Spring seat piston; 11, Upper center collar; 12, Upper cylinder liner; 13, Third center tube; 14, Lower piston; 15, Lower center collar; 16, Lower cylinder liner; 17 , lower joint; 18, lower joint righting cap; 19, return bushing; 20, slips; 21, slip seat collar; 22, spring seat; 23, anti-slip cylinder liner; 24, spring; 25, the first Two central tubes; 26, the lower spacer ring; 27, the lower rubber tube.

Detailed ways

As shown in Figure 1, it at least includes an upper joint 1, a first center pipe 4, a slip seat collar 21, a second center pipe 25, an upper center collar 11, a third center pipe 13, a lower center collar 15, a lower Joint 17, the upper joint 1 is connected with the threaded upper end of the first central pipe 4 through a threaded thread, the end of the upper joint 1 is close to the trapezoidal packing 3, the outer end of the trapezoidal packing 3 is covered with a pressure cap 2, and the lower end of the first central pipe 4 , the slip seat collar 21, the second center pipe 25, the upper center collar 11, the third center pipe 13, the lower center collar 15, and the lower joint 17 are connected to each other. An oil pipe thread is processed at one end of the upper joint 1, and can be connected with an oil pipe or a downhole tool processed with an oil pipe thread. One end of the lower joint 17 is processed with oil pipe thread, which can be connected with the oil pipe or the downhole tool processed with oil pipe thread. The lower joint 17 is sleeved with a lower joint centralizing cap 18 .

The upper rubber cylinder 6, upper spacer ring 7, middle rubber cylinder 8, lower spacer ring 26, lower rubber cylinder 27 and rubber cylinder seat 9 of the packer are sequentially installed on the bushing 5 outside the first center pipe 4. The bushing 5 is connected with the return bushing 19 through a screw thread, and forms a blocking step, so that the rubber cartridge seat 9 cannot freely pass through the outer ring of the return bushing 19 and is blocked.

The rubber cartridge seat 9 is effectively connected together with components such as the anti-sliding cylinder liner 23, the spring seat piston 10 (upper piston), the upper cylinder liner 12 through threaded threads.

An annular groove is processed on the upper part of the inner cavity of the anti-slip cylinder liner 23 as a locking step for slips 20 .

One end of the slip 20 is placed on the slip seat collar 21 through a screw thread connection, and the other end is stuck at the limit step of the annular groove processed on the upper part of the inner cavity of the anti-slip cylinder liner 23 to prevent the anti-slip liner 23 from moving upward.

The spring seat 22 is placed on the second central tube 25, and there is a spring 24 in the spring seat 22, and the spring 24 is used as the bushing 5, the upper rubber tube 6, the upper spacer ring 7, the middle rubber tube 8, the lower spacer ring 26, and the lower rubber tube 27. The return power source of rubber cartridge seat 9, anti-slip cylinder liner 23, spring seat piston 10 (upper piston), upper cylinder liner 12, lower piston 14, lower cylinder liner 16 and other components.

During the process of running down the fracturing drilling tool, due to the large outer diameter of the packer, resistance often occurs, which makes running in difficult. When the original Y344 series packer is running in the fracturing drilling tool, the packer rubber tube is automatically compressed and set after encountering resistance, and the phenomenon that the drill cannot be run in often occurs. In the past, although the performance of Y344 series packers has been improved many times, it is not ideal, and it cannot completely solve the phenomenon that the packer is automatically compressed and set when it encounters a blocking rubber tube when it is drilled down. Therefore, the positioning system of slips 20 and anti-sliding cylinder liner 23 internal cavity locking steps is added to the original Y344 series packer structure to solve the problem of automatic compression and setting of the rubber cylinder when drilling is blocked.

During fracturing construction, the pressure passes through the pressure guide hole inside the third center tube 13 and the upper center collar 11, pushing the lower piston 14 and the spring seat piston 10 (upper piston), driving the lower cylinder liner 16, upper cylinder liner 12 and Anti-slip cylinder liner 23 goes up together. First overcome the limit of the slips 20, then compress the spring and push the upper rubber cylinder 6, upper spacer ring 7, middle rubber cylinder 8, lower spacer ring 26, and lower rubber cylinder 27 on the rubber cylinder seat 9 and bushing 5 to go up together , when the bushing 5 goes up to the trapezoidal packing 3, the upper rubber sleeve 6, upper spacer ring 7, middle rubber sleeve 8, lower spacer ring 26, and lower rubber sleeve 27 of the packer start to compress and expand to set. At this time, the whole system will enter the normal fracturing operation procedure. When the fracturing operation is over, the compression spring will push the entire compression expansion system back to its original position during the pressure relief process. Make the lower piston 14, the spring seat piston 10 (upper piston), the lower cylinder liner 16, the upper cylinder liner 12, the anti-slip cylinder liner 23, the rubber tube seat 9, the upper rubber tube 6 on the bushing 5, the upper spacer ring 7, The middle rubber tube 8, the lower spacer ring 26, and the lower rubber tube 27 return to the initial state together, and the fracturing operation is completed.

Claims (4)

1. the thermal packer that has the self-return ability: it is characterized in that: comprise top connection (1) at least, first central tube (4), slip spider box cupling (21), second central tube (25), last center box cupling (11), the 3rd central tube (13), following center box cupling (15), lower contact (17), top connection (1) is connected with first central tube (4) threaded upper end by the screw thread screw thread, top connection (1) end is near trapezoidal packing (3), trapezoidal packing (3) outer end is with pressure cap (2), first central tube (4) lower end, slip spider box cupling (21), second central tube (25), last center box cupling (11), the 3rd central tube (13), following center box cupling (15), lower contact (17) interconnects; Top connection (1) one end is processed with tubing round thread, can be connected with oil pipe or the downhole tool that is processed with tubing round thread, and lower contact (17) is socketed with lower contact and sets upright cap (18).

2. the thermal packer with self-return ability according to claim 1: it is characterized in that: the last packing element (6), upper isolating ring (7), middle packing element (8), lower isolating ring (26), the lower rubber cylinder (27) and glue tube base (9) that connect packer on the lining (5) in described first central tube (4) outside successively, lining (5) links together by screw thread screw thread and return lining (19), and form one and stop step, glue tube base (9) can not freely be passed through from the outer ring of return lining (19).

3. the thermal packer with self-return ability according to claim 2: it is characterized in that: described glue tube base (9) links together by screw thread screw thread and anti-slip cylinder sleeve (23), spring base piston (10), last cylinder sleeve (12); Anti-slip cylinder sleeve (23) inner chamber top is processed with annular groove one, as the locking step of slips (20); Slips (20) one ends are placed on the slip spider box cupling (21) by the screw thread screwed connection, and the other end is stuck in the annular groove limited step place of anti-slip cylinder sleeve (23) inner chamber top processing.

4. the thermal packer with self-return ability according to claim 1: it is characterized in that: described second central tube (25) is gone up socket spring base (22), and spring (24) is arranged in the spring base (22).

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