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
CN111963135AInactive Publication Date: 2020-11-20CNPC BOHAI DRILLING ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNPC BOHAI DRILLING ENG
Publication Date
2020-11-20
Estimated Expiration
Not applicable · inactive patent

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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.
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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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