Isobaric expansion casing leakage stopping method

A technology of expanding casing and plugging method, applied in drilling equipment and methods, drilling equipment, earth-moving drilling, etc., can solve the problems of leakage and inability to ensure the integrity of the wellbore, so as to improve the drilling speed, avoid the risk of leakage, Effectiveness without loss of wellbore size

Inactive Publication Date: 2019-01-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings that the existing equal-diameter expansion casing plugging technology cannot ensure the integrity of the wellbore and there is a risk of leakage

Method used

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  • Isobaric expansion casing leakage stopping method
  • Isobaric expansion casing leakage stopping method
  • Isobaric expansion casing leakage stopping method

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Embodiment Construction

[0030] A method for leak plugging with an expansion casing of equal diameter, the steps of the method are as follows:

[0031] 1. When lowering the upper casing, the casing shoe with bell-mouth structure is lowered to the design position along with the upper casing in advance. The inner diameter of the bell-mouth structure at the lower end of the casing shoe is larger than the inner diameter of the upper casing. After the well, the drill bit is drilled through the casing shoe to form the overlapping bell mouth I1, such as figure 1 shown;

[0032] 2. After lost circulation occurs when drilling in complex formations, run the reaming tool to perform sizing and reaming on the unreamed formation 2 in the drilled section, such as figure 2 shown;

[0033] 3. Run the expansion casing of the outer string and the expansion tool of the inner string, and send them to the bottom of the open hole section, such as image 3 shown;

[0034] The expansion casing of the outer pipe string in...

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Abstract

The invention relates to the technical field of leakage stopping operation for multi-pressure-system strata and malignant leaking strata, in particular to an isobaric expansion casing leakage stoppingmethod. The method comprises the following steps that 1, when an upper-layer casing body is put down into a designed position, casing shoes of a horn-mouth structure follow the upper-layer casing body to be put down into the design position in advance, and after well cementation is conducted according to construction design, a lower drill drills the casing shoes to form a first lap-joint horn mouth, wherein the inner diameter of the horn-mouth structure of the lower ends of the casing shoes is larger than the inner diameter of the upper-layer casing body; 2, after a complex stratum has well leaking during drilling, a reaming tool is put down into a well for fixed-diameter reaming on a to-be-drilled section. According to the method, the borehole size is not damaged, the well depth structure is not changed, the integrity of a well shaft is guaranteed, the leaking risk is avoided, the drilling speed is effectively increased, and the drilling period is shortened.

Description

Technical field: [0001] The invention relates to the technical field of plugging operations in multi-pressure system formations and malignant leakage formations, in particular to a plugging method for equal-diameter expansion casings. Background technique: [0002] At this stage, oil exploration and development are gradually developing towards deep, ultra-deep and complex formations. During the drilling process, well leakage problems will inevitably be encountered. Different plugging measures are adopted for different types of leakage. For multi-pressure systems and malignant loss formations, the plugging technology of solid expansion casing with equal diameter can better solve this problem. This technology is to run the solid expansion pipe into the reamed lost well section, use the expansion tool to expand the expansion pipe radially, and the outer wall of the expanded casing is close to the formation to form a layer of "artificial well wall" to realize the sealing of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B7/20E21B7/28E21B29/00
CPCE21B7/20E21B7/28E21B29/00E21B33/13
Inventor 王磊朱太辉王春杰高玮陈思路钟勇夏方杰张铁铭张昕冉薛志永罗欢霍爱莉杨行王帅齐伟刘文程
Owner BC P INC CHINA NAT PETROLEUM CORP
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