Preparation method of cross-linkable and curable casing damage plugging agent

A technology of cross-linking, curing and plugging agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of high labor intensity, easy sticking of plugging agent, and finding out the loss point of casing, etc. The effect of saving work time and cost

Inactive Publication Date: 2014-03-05
YANCHANG OIL FIELD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a preparation method of a cross-linked and solidified casing loss plugging agent, which solves the problems that the existing plugging agent is easy to get stuck, labor-intensive, and cannot find the point of casing loss in the casing variable well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] That is, the preparation of the plugging fluid is completed.

[0030] In step b, the amount of ammonium chloride added accounts for 0.35% to 1% of the mass ratio of the mixture of bentonite, fly ash, G-grade cement and water, and the mass of citric acid added is 0.02% to 0.03% of the G-grade cement . Example 1

Embodiment 1

[0031] Weigh 240g of urea, 70g of rice flour, and 460g of formaldehyde with a concentration of 36%, and then mix 17 / 24 of the weighed urea with all the rice flour and formaldehyde at 29°C, and then use a concentration of 50% Sodium hydroxide aqueous solution adjusts the pH value of the mixture to 7.8, heats it at a constant speed to 90°C and keeps stirring, keeps it warm at 90°C for 30 minutes, then adjusts the pH value of the mixture to 6.5 with formic acid, within 12 minutes after the acid adjustment, use Check whether the mixture has reached the end of the reaction with clean water at room temperature. When the mixed solution that has reached the end of the reaction drops into the water, it will form a white mist. When the test reaches the end of the reaction, immediately cool down to 75°C, and then use 50% sodium hydroxide aqueous solution Adjust the ph value of the mixed solution to 7.8, then add the remaining urea and stir evenly, and keep the temperature to form a gel. A...

Embodiment 2

[0035] Weigh 210g of urea, 100g of rice flour, and 490g of formaldehyde with a concentration of 37%, and then mix 17 / 27 of the weighed urea with all the weighed rice flour and formaldehyde at 31°C, and then use a concentration of 50% Sodium hydroxide aqueous solution adjusts the pH value of the mixture to 7.7, heats it to 91°C at a constant speed and keeps stirring, keeps it at 91°C for 29 minutes, then adjusts the pH value of the mixture to 6.6 with formic acid, within 10 minutes after the acid adjustment, use Check whether the mixture has reached the end of the reaction with clean water at room temperature. When the mixture that has reached the end of the reaction is dripped into the water, it will form a white mist. When the test reaches the end of the reaction, immediately cool down to about 70°C, and then use 50% sodium hydroxide Adjust the ph value of the mixed solution to 7.6 with the aqueous solution, then add the remaining urea and stir evenly, and form a gel at a cons...

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PUM

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Abstract

The invention discloses a preparation method of a cross-linkable and curable casing damage plugging agent. The preparation method comprises the following steps: preparing an agent A, and then preparing an agent B, and finally, mixing the agent A with the agent B to form the plugging agent. The plugging agent prepared by the method provided by the invention is applicable to either blast hole plugging of a conventional oil-water well or casing damage well repair; the plugging agent is capable of plugging wherever the plugging agent goes; and therefore, lots of operating time and cost are saved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation technology, and in particular relates to a preparation method of a cross-linked and solidified casing loss plugging agent. Background technique [0002] Casing damaged well repair is a professional technology, which is often used in the repair of old well casings after corrosion and damage, as well as in the transformation of oil wells to improve production. In recent years, casing damage repair has mainly been performed by using a series of plugging agents such as conventional G-grade cement, superfine cement plugging agent, JS-1 low fluid loss cement, TC-1 thixotropic cement plugging agent, and high water expansion agent. oil-increasing effect. However, some problems were also found in the process of field process application, mainly in: [0003] (1) When drilling cement plugs, it is easier to get stuck and break the drill, causing downhole accidents. [0004] (2) The casing va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
CPCC04B28/00C09K8/426C09K8/428C09K8/467C04B18/08C04B14/10C04B24/12C04B24/008
Inventor 田东恩李杨勇赵进义潘祥陈红印李小平葛芷渊王平
Owner YANCHANG OIL FIELD
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