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Unthrottled self-service deblocking two-layer fracturing string and fracturing method thereof

A fracturing string without throttling technology, which is applied in the direction of production fluid, earthwork drilling, sealing/isolation, etc., and can solve problems such as fracture of fracturing string, inability to meet large-scale fracturing construction, sand sticking, etc. To meet the needs of large-scale fracturing construction, improve safety and sand delivery efficiency, and avoid flow restriction

Inactive Publication Date: 2020-11-20
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a non-throttling self-service unsealing two-layer fracturing string to solve the problem that the conventional "K344 packer + sandblasting sleeve" two-layer fracturing string can only achieve delamination from the oil pipe. Fracturing; the K344 packer needs to be set through the throttling generated by the throttle bottom valve and the sandblasting hole of the sandblasting sleeve, which cannot meet the needs of large-scale fracturing construction. Hole throttling may cause accidents such as fracturing string fracture and production casing deformation; during the process of lowering the fracturing string, the K344 packer is prone to unnecessary early setting; and after the fracturing operation is completed, the K344 packer Incomplete unsealing of the packer, sand stuck, resulting in difficulty or failure to pull out the pipe string

Method used

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  • Unthrottled self-service deblocking two-layer fracturing string and fracturing method thereof
  • Unthrottled self-service deblocking two-layer fracturing string and fracturing method thereof
  • Unthrottled self-service deblocking two-layer fracturing string and fracturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the unthrottled self-unpacking two-layer fracturing string includes the bell mouth A, the first tubing B, the sand control hydraulic anchor C, the unthrottled self-unpacking packer D, the second The second oil pipe B, the hydraulic safety joint E and the third oil pipe B; where,

[0028] The length of the first oil pipe and the second oil pipe is adapted to the distance between the first reservoir section and the second reservoir section, so that the bell mouth is located above the first reservoir section, sand control hydraulic anchor and unthrottled self-unsealing The spacer is located between the first reservoir section and the second reservoir section, and the hydraulic safety joint is located above the second reservoir section; the first oil pipe, the second oil pipe and the third oil pipe all use 2-7 / 8" oil pipe;

[0029] Such as figure 2 and image 3 As shown, the unthrottle self-unpacking packer includes an upper joint 1, an upper ...

Embodiment 2

[0041] A fracturing method using the unthrottled self-service unsealing two-layer fracturing string of embodiment 1, the specific implementation steps are as follows:

[0042] S1. According to the reservoir conditions in the oil and gas well, assemble the two-layer fracturing string without throttling self-unpacking, and run it into the production casing F to the target position, so that the unchoke self-unpacking packer D can be set at the set position Located between two fracturing intervals and avoiding casing collars;

[0043] S2. Open the casing valve, and close the casing valve after replacing the pre-fluid in the third tubing B at the top of the string; wherein, the amount of pre-fluid is consistent with the internal volume of the tubing, and the displacement is ≤0.5m 3 / min;

[0044] S3. Pressurize the third oil pipe B, and the pressure acts on the power piston 71 through the pressure transmission hole on the lower center pipe 6 in the unthrottle self-service unpackin...

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Abstract

The invention discloses an unthrottled self-service deblocking two-layer fracturing string, comprising a bell mouth, a sand-prevention hydraulic anchor, a throttling-free self-service deblocking packer and a hydraulic safety joint which are sequentially connected through oil pipes from bottom to top. According to the unthrottled self-service deblocking two-layer fracturing string, when fracturingis carried out, prepad fluid is positively replaced in an oil pipe; the packer is set between two reservoir sections; balanced pressure is applied to an annular pipeline and fracturing construction iscarried out on a first reservoir section; the hydraulic pressure of the oil pipe is kept to maintain the setting and the fracturing construction is carried out on a second reservoir section; and after the construction is completed, the string is taken out. According to the fracturing string and a fracturing construction method, two-layer fracturing construction can be completed without placing asand blasting sliding sleeve and throttling is not generated in the string, so the overflow and the overflow speed are almost close to the full drift diameter of the oil pipe, further the flow limitation is effectively avoided, the requirement for large-scale fracturing construction is satisfied, the safety and the sand conveying efficiency of the fracturing string are improved, and the lifting safety of the fracturing string is effectively improved.

Description

technical field [0001] The invention relates to the technical field of fracturing operations in oil and gas fields, in particular to a non-throttling self-unsealing two-layer fracturing string and a fracturing method thereof. Background technique [0002] In recent years, with the deepening of domestic oil and gas field development, the "K344 packer + sandblasting sliding sleeve" layered fracturing technology has become the main technology to improve the single well production of oil and gas fields. For the interlayer isolation of the section, the corresponding sandblasting sliding sleeve is opened through the throttling bottom valve and the pitching ball to carry out the fracturing construction step by step. However, for two-layer fracturing strings, this technology can only achieve layered fracturing from inside the tubing. First, the first layer of fracturing is performed through the throttle bottom valve, and then the ball is thrown to open the sandblasting sliding sleev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/128E21B43/14
CPCE21B33/128E21B43/14E21B43/26
Inventor 韩永亮冯强丁柯宇刘志斌周后俊王玥詹鸿运杨晓勇宗庆伟任正军
Owner CNPC BOHAI DRILLING ENG
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