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Oil-gas drilling concrete bridge leaking stoppage process method

A technology of oil and gas drilling and process method, which is applied in the direction of earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve problems such as repeated leakage, karst caves are difficult to play the role of plugging, and plugging failure, etc., to achieve good application Prospects, the effect of reducing the risk of re-leakage

Inactive Publication Date: 2021-02-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new method to solve the problems of existing bridge construction and plugging, such as the failure of plugging due to the collapse of the bridge and the occurrence of re-leakage, as well as the difficulty in performing plugging for centimeter-sized cracks and karst caves. Oil and gas drilling concrete bridging plugging process method capable of improving the reliability of bridging plugging and widening the application range of bridging plugging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The oil and gas drilling concrete bridging plugging process method of this embodiment is suitable for the situation that the concrete required for plugging cannot be bridging in the pumping drilling tool, wherein the maximum particle size of the crushed stone is not more than 10 mm.

[0019] The specific steps are:

[0020] A. Concrete preparation: Use a mixer truck or a mixer to prepare the concrete required for plugging with gravel;

[0021] B. Concrete pumping: Use a concrete pump truck or a concrete pump to pump the prepared concrete through the drilling tool to the location of the well leakage and squeeze it into the leakage channel to stop the leakage.

Embodiment 2

[0023] The oil and gas drilling concrete bridging plugging process method of this embodiment is suitable for preventing the concrete from blocking the drilling tool and causing complicated situations, wherein the maximum particle size of the crushed stone does not exceed 30 mm, and the specific steps are as follows:

[0024] A. Use a mixer truck or a mixer to prepare drilling fluid thick slurry and gravel to form bridging plugging slurry;

[0025] B. Use a concrete pump truck or a concrete pump to send the bridging plugging slurry into the leakage channel through the drilling tool to form a bridge and reduce the leakage speed;

[0026] C. Prepare sand and cement slurry, send the sand and cement slurry to the lost channel through the drilling tool through the concrete pump, pressurize the wellhead and replace the drilling fluid thick slurry in the original bridging plugging slurry in the gaps of the bridging gravel particles, form a concrete structure.

Embodiment 3

[0028] The oil and gas drilling concrete bridging plugging process method of this embodiment is applicable to the situation that the concrete required for plugging cannot be pumped by pumping drilling tools, and the specific steps are:

[0029] A. Use a mixer truck or a mixer to prepare the concrete required for plugging;

[0030] B. Concrete pump truck or concrete pump is continuously pumped into the wellbore at the wellhead of the drilling well, and then the drilling fluid is pumped into the drilling fluid through the drilling pump to send the concrete to the leaking position and squeeze into the leaking layer to stop the leaking.

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Abstract

The invention discloses an oil-gas drilling concrete bridge leaking stoppage process method. According to the oil-gas drilling concrete bridge leaking stoppage process method, a concrete structure isformed in a leakage channel at a well leakage position to perform leakage stoppage. The oil-gas drilling concrete bridge leaking stoppage process method has the advantages that concrete capable of being solidified is used for replacing bridge leaking stoppage slurry, a leaking stoppage body forms a rigid whole, the re-leakage risk is reduced, the concrete is formed through step-by-step implementation according to working conditions for leaking stoppage construction, the complex situation caused by drilling tool plugging during leaking stoppage concrete pumping is effectively prevented, the sizes of leaking stoppage cracks and karst caves can be greatly increased, the reliability of bridge leaking stoppage is greatly improved, the application range of bridge leaking stoppage is broadened, and the oil-gas drilling concrete bridge leaking stoppage process method has a good application prospect.

Description

technical field [0001] The invention relates to a leak-stopping method in oil-gas drilling, in particular to a process method for oil-gas drilling concrete bridging and leak-stopping. Background technique [0002] In the process of oil and gas drilling, fractured zones, fractures, karst caves, etc. are often drilled, so lost circulation is relatively common; lost circulation not only prolongs the drilling construction period, but also has a low success rate of plugging construction and high cost. The existing plugging methods include: There are many kinds, and bridging plugging is a commonly used plugging method. [0003] In the prior art, the bridging and plugging methods for lost circulation mainly include: adding rigid particles and filler materials into the drilling fluid to form a plugging slurry, and pumping the plugging slurry to the location of the lost circulation through a drilling pump to stop the leak at a static or lax position. Squeeze the leaking layer to sto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 王宗敏胡进科邹宽袁明进
Owner CHINA PETROLEUM & CHEM CORP