A kind of waterproof erosion plugging agent and its preparation method and application

A technology of plugging agent and waterproof flushing, which is applied in the field of oil drilling, which can solve the problems of strong cohesive force of lost formation, erosion of plugging agent, high bearing strength, etc., and achieve effective sealing of lost channels, high bearing strength, The effect of simple ingredients
CN107216086BActive Publication Date: 2019-11-08PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2019-11-08

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Abstract

A water-erosion-proof plugging agent and a preparation method and application thereof are disclosed, 35-40 parts by weight of water glass powder are added to 140-160 parts by weight of water, and stirred to hydrate to obtain a first water solution; 30-65 parts by weight of G-grade cement, 0.5-1 part by weight of sodium hydroxide and 0.1-0.5 part by weight of a cement reinforcing agent are mixed evenly to obtain a second mixture; 8-12 parts by weight of acrylate are added into 18-30 parts by weight of water, stirred and emulsified to obtain a third water solution; the second mixture is added into the first water solution, stirred evenly, then added into the third water solution, and mixed evenly to prepare the water-erosion-proof plugging agent. The water-erosion-proof plugging agent has good water-erosion-proof performance, and can block cracks of a water layer, at room temperature, initial setting time can be delayed by 25-60 minutes, the water-erosion-proof plugging agent can achive the effects of orthogonal instantaneous thickening and solidifying and sustainable increase of compressive strength, and the plugging effect of loss of large recurrent leakage is good.
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Description

technical field

[0001] The invention relates to a waterproof erosion plugging agent and a preparation method and application thereof, belonging to the technical field of petroleum drilling. Background technique

[0002] Lost circulation refers to various working fluids (including mud, cement slurry, completion fluid and other liquids, etc.) flowing into the formation under the action of pressure difference during various downhole operations such as drilling, cementing, testing or workover. A downhole complex situation (not counting percolation filtrate) is one of the most common and common technical problems in drilling engineering. In recent years, with the further deepening of oil and gas exploration and development, lost circulation occurred to varying degrees in the process of oilfield drilling, and the occurrence rate of lost circulation in individual blocks was as high as 43.2%. The average lost time of lost wells was 4.9 days, and the longest plugging time was 88 days...

Claims

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