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Plugging agent and preparation method thereof

A technology of plugging agent and curing agent, applied in chemical instruments and methods, drilling composition, etc., can solve problems such as adverse effects of curing strength, effect of monomers, slurry preparation water or drilling fluid that does not have curing effect, etc. , to improve the retention capacity, reduce the free water content and increase the viscosity

Active Publication Date: 2020-01-31
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leakage plugging agent mainly relies on the solidification of cement or blast furnace slag to seal the leaky layer. The effect is simple, and the water for mixing slurry or drilling fluid does not have the curing effect or has a negative impact on the curing strength.

Method used

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  • Plugging agent and preparation method thereof
  • Plugging agent and preparation method thereof

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preparation example Construction

[0043] The present invention also provides a preparation method of the above-mentioned leakage stoppage agent, comprising: S1) mixing 100 parts by weight of water, 5-20 parts by weight of curing agent, 1-6 parts by weight of activator and 1-5 parts by weight of The gelling agent is mixed to obtain a gel; S2) The gel is mixed with 40-120 parts by weight of a structural base material to obtain a plugging agent.

[0044] Wherein, the water, curing agent, activator, gelling agent and structural base material are all the same as above, and will not be repeated here.

[0045] In the present invention, the step S1) specifically includes: mixing water with a curing agent, adding an activator after being completely dissolved, adding a gelling agent after being completely dissolved, and continuing to stir to obtain a gel; The preferred time is 0.5-10 min; the gel is a colorless or white viscous gel; the viscosity of the gel is preferably 100-1000 mPa.s. This step is to use silicate and...

Embodiment 1

[0050] In parts by mass, add 20 parts by mass of sodium silicate, 1 part by mass of sodium hydroxide, and sodium metaaluminate of 3 parts by mass to 100 parts by mass of water to form a viscous gel, then add 40 parts by mass of Blast furnace slag is used as a plugging agent.

Embodiment 2

[0052] In parts by mass, add 10 parts by mass of sodium silicate, 3 parts by mass of sodium hydroxide, and sodium metaaluminate of 4 parts by mass to 100 parts by mass of water to form a viscous gel, then add 50 parts by mass of Blast furnace slag is used as a plugging agent.

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Abstract

The invention provides a plugging agent, which comprises, by weight, 100 parts of water, 5-20 parts of a curing agent, 1-6 parts of an activator, 1-5 parts of a gelatinizing agent, and 40-120 parts ofa structural base material, wherein the curing agent is silicate, and the gelatinizing agent is an aluminum salt. Compared with the plugging agent in the prior art, the plugging agent of the invention has the following characteristics that the silicon-aluminum gel formed by the silicate and the aluminum salt is used as the base slurry, the free water can be bound in the whole gel system structureso as to reduce the content of the free water and improve the viscosity of the gel system, and the liquid filtered out in the plugging process contains high-concentration silicate ions so as to reactwith the formation water and various minerals in the stratum to strengthen the plugging effect; the activator reacts with the structural base material to form a high-strength solidifying body, and the curing agent and the gelatinizing agent participate in the solidification reaction, so that the plugging agent filtrate, the filter cake and the plugging agent can participate in the solidificationand cementation of the leakage channel and the stratum rock mass so as to increase the plugging treatment radius; and the plugging agent is wide in density adjustment range.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a plugging agent and a preparation method thereof. Background technique [0002] With the deepening of oil and gas exploration and development, the occurrence of complex leakage during drilling operations has gradually increased. Difficulty in judging the leakage layer and the size of the leakage channel, the small leakage pressure difference at the bottom of the well, the frequent leakage, and the difficulty in processing the leakage have become the main technical problems that hinder the smooth implementation of oil and gas exploration and development. [0003] At present, the plugging technologies widely used in the field are bridge plugging and cement slurry plugging. Bridge plugging is the most widely used plugging method at present. In field application, it is necessary to accurately judge the type and size of the leakage channel, so as to select the...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B28/26
CPCC09K8/467C04B28/26C04B2111/00724C04B22/062C04B22/0093C04B18/141Y02W30/91
Inventor 张麒麟孙善刚刘云飞田军黄宁贾启高
Owner SINOPEC SSC
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