Preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer

A technology for cementing cement slurry and fluid loss reducer, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of low reaction temperature and no guidance scheme is given, and achieves lower reaction temperature and water locking. "Strong ability and high efficiency

Active Publication Date: 2018-09-25
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above technologies have not given specific guidance on how to further improve the high temperature resistance and salt resistance of the fluid loss reducer, and its preparation method is simple, the reaction temperature is low, energy saving and environmental protection

Method used

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  • Preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer
  • Preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer
  • Preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: The preparation method of the micro-crosslinked high-temperature and salt-resistant cementing slurry fluid loss reducer of the present invention includes the following process steps: ① Weigh 2 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (itaconic acid), N-vinylpyrrolidone, these four kinds of raw materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted value to 7 (mass percent concentration can be used to adjust the pH value of 30% NaOH solution), add 0.2% of the crosslinking agent N, N-methylenebisacrylamide and the total amount of reaction monomers 0.5% molecular weight regulator sodium methacryl sulfonate, prepared into a solution with a monomer concentration of 20%. ② Afterwards, pour this solution into a three-neck flask equipped with a thermometer and a stirring device, heat (react) in an oil bath, and raise the temperature to 45°C. ③ After the temperature stabiliz...

Embodiment 2

[0023] Example 2: The preparation method of the micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer of the present invention includes the following process steps: ① Weigh 2 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (maleic acid), N-vinylpyrrolidone, these four kinds of raw materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted value to 6.5 (mass percent concentration can be used to adjust the pH value of 30% NaOH solution), add 0.13% of the crosslinking agent N, N-methylenebisacrylamide and the total amount of reaction monomers It is 0.45% molecular weight regulator thioglycolic acid, and it is prepared into a solution with a monomer concentration of 18%. ②Pour this solution into a three-neck flask equipped with a thermometer and a stirring device, heat it in an oil bath, and raise the temperature to 48°C. ③ After the temperature stabilizes, add an i...

Embodiment 3

[0024] Example 3: The preparation method of the micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer of the present invention includes the following process steps: ① Weigh 2 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (fumaric acid), N-vinylpyrrolidone, these four kinds of raw materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted value to 7.5 (mass percentage concentration can be used to adjust the pH value of 30% NaOH solution), add the crosslinking agent N that accounts for 0.18% of the total amount of reaction monomers, N-methylenebisacrylamide and the total amount of reaction monomers It is 0.58% molecular weight regulator mercaptopropionic acid, and it is prepared into a solution with a monomer concentration of 23%. ②Pour this solution into a three-neck flask equipped with a thermometer and a stirring device, heat it in an oil bath, and raise the t...

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Abstract

The invention provides a preparation method of a micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer. The preparation method includes following steps: respectively weighing 2-acrylamido-2-methyl propanesulfonic acid, acrylamide, unsaturated polybasic carboxylic acid and N-vinyl pyrrolidone, and dissolving in deionized water to obtain a solution; adjusting pH value of the solution to 6-8, adding a crosslinking agent and a molecular weight regulator, and finally preparing a solution of 15-25% in monomer concentration, wherein the crosslinking agent is N, N-methylene bisacrylamide, and the molecular weight regulator is one of sodium methallyl sulfonate, thioglycollic acid and thiohydracylic acid; heating the finally-prepared solution; after temperature is stable, adding an initiator into the solution, and continuing to react to obtain a liquid final product, wherein the initiator is composed of ammonium persulfate and L-ascorbic acid according to a mass ratio of 1.8-2.2:1. High-temperature resistance and salt resistance of the filtrate loss reducer prepared by the method are further improved, and the preparation method is simple in process, easy to operate, low in reaction temperature, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a cement slurry fluid loss reducer, in particular to a preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer. Background technique [0002] During cementing construction, the cement slurry is squeezed into the annular space, and when it flows through the permeable formation, filtration will occur, causing part of the liquid phase to leak into the formation. This process is called "water loss". If the water loss cannot be controlled, the pH value will be as high as 11.3-13.2, and the fluid lost by filtration will cause serious damage to the production layer, block the rock pores, and lead to the destruction of permeability, which will directly affect the production of oil wells; at the same time, after water loss The density of cement slurry increases, the consistency increases, the flow ability becomes worse, the thickening time is shortened, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F220/56C08F222/02C08F226/10C09K8/487
CPCC08F220/58C08F220/585C09K8/487C08F220/56C08F222/02C08F226/10
Inventor 夏亮亮刘昭洋倪涛
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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