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Top packer for sand control

A packer and sand control technology, applied in sealing/isolation, wellbore/well components, earthwork drilling and production, etc., can solve the problems of casing inner wall bite damage, setting, small hanging load, etc., and achieve simple assembly procedures , On-site operation is simple, the effect of strong suspension ability

Active Publication Date: 2015-09-23
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The top packer for sand control is a necessary sand control tool in gravel packing sand control operations. Although there are many kinds of packers on the market, after long-term research, it is found that they all have different technical bottlenecks. First, our company The top packer developed in the first phase has the phenomenon of scratching the casing during the setting process, and the serious damage to the inner wall of the casing after the packer is set in place, which affects the strength of the casing body to a certain extent. Bring some operational risks to subsequent production
Second, the working condition parameters of the traditional top packer are set on the low side, the packer has poor pressure bearing capacity, small suspension load, and no recovery function. During the run-in process, the slips accidentally protruded out, causing the packer to be set in advance. risk
Third, the bearing torque is small, and it is impossible to realize the casing milling operation of packer salvage recovery

Method used

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  • Top packer for sand control
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  • Top packer for sand control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see Figure 1 to Figure 3 , a top packer for sand control, including an upper joint 3 and a lower joint 30, a central pipe 7 is arranged below the slit through the slit in the middle of the upper joint in the upper joint, and also includes a setting mechanism, a locking mechanism, an anchor Fixing mechanism, sealing mechanism and unsealing mechanism.

[0035] The setting mechanism includes a pressure sleeve 1 sleeved on the outside of the upper joint and a first shear pin 9 radially provided on the outside of the bottom of the upper joint for blocking the downward movement of the connecting sleeve.

[0036] The locking mechanism includes a connecting sleeve 8 which is threadedly connected with the pressure sleeve below the pressure sleeve, and a lock ring 5 connected with the upper joint with a sawtooth thread 5-1 is arranged in the space between the outer side of the upper joint and the inner side of the pressure sleeve.

[0037] The sealing mechanism is located under...

Embodiment 2

[0046] see Figures 6 to 8 , this embodiment is mostly the same as Embodiment 1, the only difference is that each slip 19 includes two outward protrusions, the protrusions are provided with slip teeth, and the slip sleeve is provided with a number of accommodating clips at intervals. A hole through which the protruding part of the shoe passes outwards and whose shape and size match the tangential section of the protruding part of the slip. The two protruding parts of each slip protrude or retract from the adjacent hole. The middle of the two protruding parts It is a groove extending in the axial direction. There is a spring piece inside the groove. The spring piece is bow-shaped. in the slot. On the top of the slips in the slip sleeve, an open ring 31 is also fixed by rivets.

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Abstract

The invention relates to a top packer used for preventing sand. The top packer used for preventing the sand comprises an upper connector and a lower connector, wherein a central pipe is arranged on the lower portion of a sealing piece and in the upper connector through the sealing piece which is arranged in the middle of the upper connector. The top packer used for preventing the sand is characterized by further comprising a setting mechanism, a locking mechanism, an anchoring mechanism, a sealing mechanism and an unsealing mechanism. The top packer used for preventing the sand has the advantages of being capable of effectively sealing space in a casing pipe and keeping the space fixed and suitable for series application of different casing pipes of different pound classes, meanwhile, optimizing the anchoring mechanism, guaranteeing that the casing pipe is not scraped and damaged by the slips in a setting process, and being slight in damage to the casing pipe when anchoring of slips is in place, and shallow in bite mark. In addition, the top packer used for preventing the sand is simple in assembling procedure and convenient, safe and reliable in the spot operation process.

Description

technical field [0001] The invention belongs to the technical field of oil field development and production, in particular to a top packer for sand control. Background technique [0002] In the current well-known oilfield development, with the increase of drilling and production of deep wells and complex wells, especially the continuous innovation of well completion technology, higher requirements are put forward for the functions and use of well completion tools. The top packer for sand control is a necessary sand control tool in gravel packing sand control operations. Although there are many kinds of packers on the market, after long-term research, it is found that they all have different technical bottlenecks. First, our company The top packer developed in the first phase has the phenomenon of scratching the casing during the setting process, and the serious damage to the inner wall of the casing after the packer is set in place, which affects the strength of the casing b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/128E21B33/1295
Inventor 杨立平刘传刚于海永杨学贵苏杰谭峻松
Owner CHINA NAT OFFSHORE OIL CORP
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