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Prestressed Safety Completion String and Method for the Whole Hole Section of Thermal Recovery Horizontal Well

A completion pipe string and prestressing technology, applied in wellbore/well components, drill pipe, casing, etc., can solve the problems of no effective compensation in the horizontal section and inability to pull prestressing, etc. The effect of well quality and strong righting force

Active Publication Date: 2020-12-01
CHINA PETROLEUM & CHEM CORP +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 prestressed safety completion pipe string and method for the whole well section of a thermal recovery horizontal well, so as to solve the problems that the current thermal recovery horizontal well completion cannot pull the prestress and the horizontal section has no effective compensation

Method used

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  • Prestressed Safety Completion String and Method for the Whole Hole Section of Thermal Recovery Horizontal Well

Examples

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Effect test

Embodiment 1

[0020] Example 1, xx horizontal well is completed with 7in casing + sand filter pipe, the well depth is 1500m, and the vertical section is 800m deep. The compensator 5 is respectively installed between the casing 1 and the sand filter pipe 6, and the well flushing valve 7 is installed at the rearmost end of the entire well completion string. Run the completion string into the well, pressurize 10MPa and set the hydraulic centralizer 3, and the upper arm of the centralizer is supported on the open hole wall to ensure that the casing is centered in the well. Press 12MPa to open the anchor fluke of the hollow prestressed ground anchor 2. The anchor fluke is supported on the open hole wall, and the lifting pipe string is used to lift the prestress to 40 tons, and then continue to press to 14MPa to seal the plug-free grading hoop 4 rubber tube. Afterwards, pressurize to 16MPa to open the drill-free grading collar 4 circulation channel, and perform cement injection and cementing to t...

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Abstract

The invention discloses a horizontal well thermal recovery full well section prestress safe completion pipe string and a method. The horizontal well thermal recovery full well section prestress safe completion pipe string comprises a hollow prestress ground anchor, a hydraulic centralizer, a drill-plug-free grading hoop and a sand screening pipe assembly which are sequentially connected from front to back. The sand screening pipe assembly comprises at least two sand screening pipes and thermosensitive compensators, and the thermosensitive compensators are connected between every two sand screening pipes. The rearmost end of the sand screening pipe assembly is connected with a well washing valve. The upper end of the hollow prestress ground anchor is connected with a casing pipe. According to the horizontal well thermal recovery full well section prestress safe completion string and the method, the problems that at present, prestress cannot be pulled during horizontal well thermal recovery completion, and effective compensation does not exist in a horizontal section are solved; and pipe string thermal stress protection of a full well section is achieved, the influence brought by high-temperature steam injection is counteracted, and safe production of the completion pipe string is ensured.

Description

technical field [0001] The invention relates to a horizontal well completion technology for an oil field, in particular to a prestressed safety well completion pipe string and a method for the whole well section of a thermal recovery horizontal well. Background technique [0002] Thermal recovery of horizontal wells has gradually become an important means to improve the recovery rate of heavy oil reservoirs and single well production. When steam above 300 °C is injected into the well, the completion string will become unstable and deformed due to heat. It will go up and out of the wellhead, causing damage to the cement sheath between the casing and the open hole, and problems such as gas channeling are prone to occur. The sand filter pipe in the horizontal section elongates and cannot be released after being heated, which makes the sand filter pipe unstable and deformed, easily deformed and broken, and seriously affects the life of the oil well. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B17/10E21B23/01E21B33/12E21B43/08
CPCE21B17/00E21B17/1078E21B23/01E21B33/12E21B43/08
Inventor 王增林张峰伊西锋李敢董建国李玉宝李明刘永顺吕玮
Owner CHINA PETROLEUM & CHEM CORP
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