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Water-erosion-proof plugging agent and preparation method and application thereof

A technology of plugging agent and anti-scour, applied in the field of oil drilling, can solve the problems of strong cohesion of the lost formation, high pressure bearing strength, erosion of the lost circulation agent, etc., and achieves effective plugging of lost channels and high pressure bearing strength. , the effect of stable state

Active Publication Date: 2017-09-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a plugging agent and its preparation method and application, which can solve the problem of plugging failure due to the erosion and dilution of high water content and water-containing formation water on the plugging agent, and has high pressure bearing strength , deformability and strong adhesion with lost formation

Method used

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  • Water-erosion-proof plugging agent and preparation method and application thereof
  • Water-erosion-proof plugging agent and preparation method and application thereof
  • Water-erosion-proof plugging agent and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0032] The waterproof erosion plugging agent of the present embodiment comprises the following components in parts by weight:

[0033] Solid water glass powder: 35 parts by weight

[0034] Acrylate: 8 parts by weight

[0035] Grade G cement: 30 parts by weight

[0036] Sodium hydroxide: 0.5 parts by weight

[0037] Cement early strength agent: 0.2 parts by weight.

[0038] The waterproof erosion plugging agent of the present embodiment is prepared as follows:

[0039] 1) In parts by weight, 35 parts by weight of solid water glass powder is added to 140 parts by weight of water at 80° C., fully stirred and hydrated under a pressure of 5 MPa to make the first aqueous solution;

[0040] 2) Mix 30 parts by weight of grade G cement, 0.5 parts by weight of sodium hydroxide, and 0.2 parts by weight of cement reinforcing agent to obtain the second part of the mixture.

[0041] 3) Add 8 parts by weight of acrylate to 20 parts by weight of water at room temperature and normal press...

Embodiment 2

[0044] The waterproof erosion plugging agent of the present embodiment comprises the following components:

[0045] Solid water glass powder: 35 parts by weight

[0046] Acrylate: 10 parts by weight

[0047] Grade G cement: 30 parts by weight

[0048] Sodium hydroxide: 0.5 parts by weight

[0049] Cement early strength agent: 0.2 parts by weight.

[0050] The waterproof erosion plugging agent of the present embodiment is prepared as follows:

[0051] 1) Add 35 parts by weight of solid water glass powder to 140 parts by weight of water at 80° C., fully stir and hydrate under a pressure of 5 MPa to prepare the first aqueous solution;

[0052]2) Mix 30 parts by weight of grade G cement, 0.5 parts by weight of sodium hydroxide, and 0.2 parts by weight of cement reinforcing agent to obtain the second part of the mixture.

[0053] 3) Add 10 parts by weight of acrylate to 25 parts by weight of water at room temperature and normal pressure, fully stir, and thoroughly emulsify to ...

Embodiment 3

[0056] The waterproof erosion plugging agent of the present embodiment comprises the following components:

[0057] Solid water glass powder: 38 parts by weight

[0058] Acrylate: 10 parts by weight

[0059] Grade G cement: 50 parts by weight

[0060] Sodium hydroxide: 0.7 parts by weight

[0061] Cement early strength agent: 0.4 parts by weight.

[0062] The waterproof erosion plugging agent of the present embodiment is prepared as follows:

[0063] 1) Add 38 parts by weight of solid water glass powder to 152 parts by weight of water at 100° C., fully stir and hydrate under a pressure of 6 MPa to prepare the first aqueous solution;

[0064] 2) Mix 50 parts by weight of grade G cement, 0.7 parts by weight of sodium hydroxide, and 0.4 parts by weight of cement reinforcing agent to obtain the second part of the mixture.

[0065] 3) Add 10 parts by weight of acrylate to 25 parts by weight of water at room temperature and pressure, fully stir and thoroughly emulsify to make t...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B111/27C04B111/70C04B111/74
CPCC04B28/02C04B2111/00724C04B2111/275C04B2111/70C04B2111/74C04B2201/50C04B22/00C04B22/062C04B24/045C04B2103/12
Inventor 蒙华军高云文吴学升欧阳勇黄占盈段志锋李治君王彦博周文军艾磊陈春宇余世福张燕娜赵巍王勇茗李波
Owner PETROCHINA CO LTD
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