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Drill-feeding plugging agent

A technology of plugging while drilling and shell powder, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting the rheology of drilling fluid, increasing drilling costs, reducing drilling speed, etc., to achieve guaranteed performance, The effect of low production cost and increased drilling speed

Active Publication Date: 2012-05-23
COSL CHEM TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] U.S. patent usp303206 invented a granular lost circulation agent processed from waste plants. This patent has the following disadvantages in the process of use: it is easy to generate foam in the drilling fluid, which affects the rheology of the drilling fluid. The formed plugging layer is relatively loose, and it is necessary to stop drilling for plugging during use. In fact, it does not belong to the category of plugging while drilling
[0007] Some plugging agents such as bridging plugging agent and liquid casing have the function of plugging while drilling, but the production cost is high and the process is complicated. During the plugging process, it is easy to cause foaming and paste vibrating sieve slippage, which reduces the Drilling speed, increasing drilling cost
[0008] Chinese patent CN200410037657 has invented a new LWD plugging agent whose main raw material is waste plants. Remove the colloid and lignin in it, and then dry and pulverize it before use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh the components according to the following ratio: 60 parts of nut shell powder, 30 parts of limestone powder, and 10 parts of oil-soluble resin; among them, walnut shell powder is selected for the above-mentioned nut shell powder, and synthetic acrylic oil-soluble resin is selected for the oil-soluble resin; The components are mixed uniformly on a general mixing equipment such as a mixer or a kneader.

[0035] The above walnut shell powder is prepared by crushing the walnut shell, and then passing through a 100-mesh sieve. The effect of using other types of husk powder is the same, for example, apricot husks, jujube husks, and jasmine husks, and mixed husks of more than one kind of these husks are selected. The specific preparation method is the same as above.

[0036] The above-mentioned limestone powder is prepared as follows: select limestone with a calcium carbonate content of more than 92%, pass through a 200-mesh sieve after crushing, and the sieve residue is at ...

Embodiment 2

[0060] Weigh the components according to the following ratio: 50 parts of nut shell powder, 40 parts of limestone powder, and 2 parts of oil-soluble resin; among them, apricot shell powder is used for the above-mentioned nut shell powder, and phenolic resin is used for the oil-soluble resin; the preparation method is the same as the implementation. example 1.

Embodiment 3

[0062] Weigh the components according to the following proportions: 70 parts of fruit shell powder, 60 parts of limestone powder, and 20 parts of oil-soluble resin; among them, the above-mentioned fruit shell powder is selected from wild jujube shell powder, and the oil-soluble resin is selected from epoxy resin; the preparation method is the same as the implementation. example 1.

[0063] The above-mentioned apricot shell powder is prepared by crushing the apricot shell and then passing it through a 100-mesh sieve. Using other types of nutshell powder has the same effect, and the preparation method is the same as above.

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Abstract

The invention discloses a follow-drilling plugging agent, which comprises the following compositions: 50 to 70 portions of fruit shell powder, 20 to 60 portions of limestone powder and 2 to 20 portions of oil-soluble resin. The follow-drilling plugging agent can be well applied to follow-drilling plugging in a drilling well and does not require stopping drilling and stopping a vibrating screen.

Description

Technical field [0001] The invention relates to a drilling fluid treatment agent used in petroleum drilling engineering, in particular to a plugging agent while drilling and a preparation method thereof. Background technique [0002] In the process of drilling, leakage occurs from time to time. Lost circulation is one of the common downhole complex situations during drilling and completion. At present, the leakage prevention and plugging in the drilling process at home and abroad are parallel. Leak prevention is mainly to predict formation pressure gradient, balanced pressure drilling or underbalanced drilling. There are dozens of plugging technologies at home and abroad at present, including bridge plugging, fractured leakage, gel plugging and some traditional plugging methods. In order to plug the leaking layer, various plugging materials must be used to build a blocking partition wall in the leakage channel very close to the wellbore to block the flow path of the leakage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/42
Inventor 李银素陈俊生高冬梅袁梅黄晶赵静
Owner COSL CHEM TIANJIN
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