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Polymer oil layer protective agent for drilling fluid and preparation method

A technology for oil layer protection and polymers, which is applied in the field of preparation of polymer oil layer protective agents for oilfield drilling fluids, can solve the problems of poor plugging effect of polymeric alcohols, great impact on drilling fluid performance, and inelastic deformability, etc., to achieve Enhanced plugging ability, mild and controllable preparation conditions, and improved temperature and salt resistance

Active Publication Date: 2013-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used protective agents still have some defects, such as ① cationic emulsified asphalt has a great influence on the performance of drilling fluid, large deformability, poor elasticity and rigidity, poor plugging performance, and low pressure bearing capacity; ② polymerized alcohols ③ The plugging performance of non-permeable or ultra-low-permeable products is good, but the viscosity-increasing effect is significant and the inhibition is poor; ④ Ultra-fine calcium carbonate is inelastic and deformable, and has no Poor adaptability, narrow blocking range, no inhibition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation method of the present invention is carried out as follows:

[0024] (1) Preparation of raw materials: Calculated based on the amount added per 80 ml of water: 95 ml of styrene, 5 ml of butyl acrylate, 40 ml of 2-acrylamido-2-methylpropanesulfonic acid, and 0.01 g of ammonium persulfate;

[0025] (2) Preparation of mother liquor: Add styrene, butyl acrylate, and 2-acrylamido-2-methylpropanesulfonic acid into water according to the ratio of raw materials in step (1), and mix well to form a primary mother liquor;

[0026] (3) Mother liquor emulsification: Add 5 grams of any type of allyl ether sulfonate (such as allyl ether sodium sulfonate) to the mother liquor obtained in step (2) to obtain a mixed solution A, A solution The mass concentration is 6%;

[0027] (4) Polymerization reaction: first pass nitrogen gas into the mixed solution in step (3) for 25 minutes, then heat to 70°C, add ammonium persulfate according to the raw material ratio in step (1), and t...

Embodiment 2

[0032] Preparation method of the present invention is carried out as follows:

[0033] (1) Preparation of raw materials: Calculated based on the amount added per 120 ml of water: 85 ml of styrene, 65 ml of butyl acrylate, 5 ml of 2-acrylamido-2-methylpropanesulfonic acid, and 0.2 g of ammonium persulfate;

[0034] (2) Preparation of mother liquor: Add styrene, butyl acrylate, and 2-acrylamido-2-methylpropanesulfonic acid into water according to the ratio of raw materials in step (1), and mix well to form a primary mother liquor;

[0035] (3) Mother liquor emulsification: Add 5 grams of any type of allyl ether sulfonate (such as allyl ether sodium sulfonate) to the mother liquor obtained in step (2) to obtain a mixed solution A, A solution The mass concentration is 20%;

[0036] (4) Polymerization reaction: first pass nitrogen gas into the mixed liquid in step (3) for 35 minutes, then heat to 70°C, add ammonium persulfate according to the raw material ratio in step (1), and th...

Embodiment 3

[0041] Preparation method of the present invention is carried out as follows:

[0042] (1) Preparation of raw materials: Calculated based on the amount added per 100 ml of water: 90 ml of styrene, 50 ml of butyl acrylate, 25 ml of 2-acrylamido-2-methylpropanesulfonic acid, and 0.1 g of ammonium persulfate;

[0043] (2) Preparation of mother liquor: Add styrene, butyl acrylate, and 2-acrylamido-2-methylpropanesulfonic acid into water according to the ratio of raw materials in step (1), and mix well to form a primary mother liquor;

[0044] (3) Mother liquor emulsification: Add 5 grams of any type of allyl ether sulfonate (such as allyl ether sodium sulfonate) to the mother liquor obtained in step (2) to obtain a mixed solution A, A solution The mass concentration is 35%;

[0045] (4) Polymerization reaction: first pass nitrogen gas into the mixed liquid in step (3) for 30 minutes, then heat to 70°C, add ammonium persulfate according to the raw material ratio in step (1), and t...

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Abstract

The invention provides a polymer oil layer protective agent for a drilling fluid and a preparation method. The method is carried out according to the following steps of (1) adding 85-95 parts by volume of styrene, 5-65 parts by volume of butyl acrylate and 5-40 parts by volume of 2-acrylamido-2-methyl propanesulfonic acid to water, mixing uniformly, and then adding 5 parts by volume of an emulsifier to obtain a mixed liquid; (2) passing nitrogen into the mixed liquid obtained by the step (1) for 25-35 min, heating to a temperature of 70 DEG C, adding 0.01-0.2 part by weight of an initiator, and then reacting for 5-7 h by controlling the temperature at 70-80 DEG C to obtain a reaction liquid; (3) cooling the reaction liquid obtained by the step (2) to a room temperature, then adjusting a pH value of the liquid to 9-10 with a sodium hydroxide solution, putting the obtained solution in methanol with stirring, and precipitating to obtain a white precipitate; and (4) drying the white precipitate obtained by the step (3) at a temperature of 95-105 DEG C, and smashing the dried precipitate to obtain a product.

Description

technical field [0001] The invention relates to a preparation method of a polymer oil layer protective agent for oil field drilling fluid. Background technique [0002] In the process of oil and gas extraction, all aspects of exploration and development can cause damage to oil and gas layers, and any slight pollution damage will lead to a significant reduction in production capacity. Therefore, the problem of oil and gas layer pollution has been gradually recognized by people, and the oil and gas layer protection technology has also developed rapidly. Various single and composite oil layer protection materials have played an active role in the process of drilling. However, the currently used protective agents still have some defects, such as ① cationic emulsified asphalt has a great influence on the performance of drilling fluid, large deformability, poor elasticity and rigidity, poor plugging performance, and low pressure bearing capacity; ② polymerized alcohols ③ The plug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F212/08C08F220/18C08F220/58C08F2/24
Inventor 宫新军李秀灵陈二丁袁丽王海锋杨龙波杨倩云陈宝强张景红张衍喜蔡勇
Owner CHINA PETROLEUM & CHEM CORP
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