Process method for preventing oil well leakage

A streamlined oil well technology, applied in wellbore/well components, drilling equipment and methods, drilling equipment, etc., can solve the problems of oil well leakage, chemical substances and shale gas mixed into groundwater, etc., to achieve simple use and avoidance Oil well lost circulation problem, practical effect

Inactive Publication Date: 2018-06-01
CHENGDU LAIBAO PETROLEUM EQUIP
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fracking fluid can cause chemicals and shale gas to mix into groundwater, which can easily cause oil wells to leak
A

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] A flow-through method for preventing lost circulation in oil wells of the present invention comprises the following steps:

[0019] S1, clean the outer ring of the drill pipe before drilling; if the outer ring of the drill pipe is not clean, the effective drilling time will be shortened, and at the same time, it is easy to cause oil well lost circulation due to different shear forces.

[0020] S2, using specific gravity less than 1.8cm 3 The mud can be circulated to remove cuttings and blocks in the well; the specific gravity is less than 1.8cm 3 The mud used is low specific gravity mud with low viscosity. Although the removal efficiency is low, it can effectively avoid the occurrence of lost circulation in oil wells.

[0021] S3, using specific gravity greater than 1.8cm 3 The mud is used for drilling operations; this step provides sufficient well strength for drilling operations and prevents the well wall from being too thin to cause lost circulation in oil wells. ...

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PUM

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Abstract

The invention discloses a process method for preventing oil well leakage, and relates to the field of method of preventing oil well leakage. The process method comprises the following steps that S1, adrill pipe outer ring is cleaned before well drilling; S2, mud with specific gravity which is less than 1.8 cm <3> is used, and rock debris and drop pieces in the well is circularly cleaned; S3, mudwith specific gravity which is greater than 1.8cm<3> is used for drilling operation; and S4, every 24 hours of the drilling operation, mud drum on a drill or a centralizing machine is cleaned, the process method for preventing oil well leakage is circularly executed from the step S1, meanwhile, the drilling environment needs be avoided near a pumping well, and the step S2 is executed after crushing and acidizing treatment of the well after a drilling. The process method for preventing oil well leakage can realize and effectively evade the oil well leakage problem only by using existing conditions of drilling, and process method for preventing oil well leakage has the advantages of simple operation and high practicability.

Description

technical field [0001] The invention relates to a method for preventing lost circulation of an oil well, in particular to a process-based method for preventing lost circulation of an oil well. Background technique [0002] Conventional shale gas extraction technology is mainly hydraulic fracturing technology. The so-called hydraulic fracturing is to inject the fracturing hydraulic pressure into the oil well, fracturing the rock formation, and then inject the proppant into the fracture channel with high conductivity, mainly quartz sand to support the fracture, thereby improving oil and gas recovery. Mining process. Fracking fluid can cause chemicals and shale gas to mix into groundwater, which can easily cause oil wells to lose circulation. At the same time, acidification and other environments can easily lead to oil well leakage problems. How to prevent lost circulation in oil wells has always been a difficult problem in field drilling. Contents of the invention [000...

Claims

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Application Information

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IPC IPC(8): E21B7/00E21B21/00
CPCE21B7/00E21B21/00
Inventor 谭正怀
Owner CHENGDU LAIBAO PETROLEUM EQUIP
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