Fractured volcanic rock stratum return-loss leakage plugging method

A plugging method and volcanic rock technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as poor plugging effect, and achieve the effect of solving poor plugging effect.

Pending Publication Date: 2022-02-22
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The main purpose of the present invention is to provide a method for leak plugging of lost-return leakage in fractured volcanic rock formations to solve the problem of poor plugging effect of lost-return leakage in fractured volcanic rock formations

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  • Fractured volcanic rock stratum return-loss leakage plugging method
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  • Fractured volcanic rock stratum return-loss leakage plugging method

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Embodiment Construction

[0023] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs.

[0025] In the present invention, unless stated otherwise, the used orientation words such as "upper, lower, top, bottom" are usually for the directions shown in the drawings, or for the parts themselves in the vertical, In terms of vertical or gravitational direction; similarly, for the convenience of understanding and description, "inner and outer" refer to the inner and outer relative to the outline of each component itself, but the above orientation words ...

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Abstract

The invention provides a fractured volcanic rock stratum return-loss leakage plugging method. The invention discloses a fractured volcanic rock stratum return-loss leakage plugging method. The method comprises the following steps of collecting leakage data of a leakage well, and determining a leakage type of the leakage well according to the leakage data; plugging slurry being prepared; evaluating the indoor leaking stoppage effect by using a leaking stoppage instrument; pulling out a hole and putting a polished drill rod, putting a drilling tool to the bottom of a leakage layer of the leakage well, filling drilling fluid in an annular space, and pumping leakage stopping slurry; and pulling out the hole to the upper liquid level of the special plugging slurry, closing the blowout preventer, and pressurizing to squeeze the plugging slurry into the leakage layer till the drilling parameters all meet the drilling design requirements. The method effectively solves a problem of poor return-loss leakage stoppage effect of volcanic fractured formation in the prior art.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a method for plugging lost leakage in fractured volcanic rock formations. Background technique [0002] Lost circulation is one of the major technical problems in drilling engineering. Most of the lost circulation is related to fractures. The cost of leak prevention and plugging caused by fractured lost circulation accounts for more than 90% of the total cost of loss control. For volcanic rock formations, the fracture system is more complex than conventional fractured formations. Various types of fractures such as filling fractures, oblique fractures, reticular fractures, straight splitting fractures, and induced fractures are mixed in volcanic rock formations. The fracture system can easily lead to the complicated situation of the fractured leakage of the drilling fluid. The return loss is one of the important manifestations of the fractured leakage of leaking volcanic rocks, and...

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Application Information

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IPC IPC(8): E21B33/138C09K8/42
CPCE21B33/138C09K8/426
Inventor 徐生江叶成巩加芹鲁铁梅
Owner PETROCHINA CO LTD
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