Preparation method of drilling-fluid-use high-temperature-resistant saturated-salt-resistant filtrate loss reducer

A filtrate reducer and anti-high temperature technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of increasing resistance to high temperature shear damage, improving difficulty, and stabilizing the performance of resistance to salt and calcium intrusion

Active Publication Date: 2013-06-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some researches on copolymer fluid loss additives have been carried out at home and abroad in recent years, so far there is no fluid loss additive product that can resist saturated salt at high temperature above 220°C, so it is necessary to develop a fluid loss additive A new type of fluid loss reducer with a temperature resistance above 220°C and resistance to saturated salt

Method used

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  • Preparation method of drilling-fluid-use high-temperature-resistant saturated-salt-resistant filtrate loss reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: A high-temperature protective glue anti-slump fluid loss agent for drilling fluid, the preparation method of which is:

[0016] 1) Add 35 grams of water to the reaction kettle, add 30 grams of acrylamide, 10 grams of 2-acrylamido-2-methylpropanesulfonic acid, and 3 grams of polyvinylpyrrolidone into the reaction kettle and stir to dissolve to the total mass percentage concentration For a 55% mixed aqueous solution, raise the temperature to 40°C;

[0017] 2) Add 4 grams of dimethyl diallyl ammonium chloride and stir to dissolve;

[0018] 3) Add an aqueous solution of potassium hydroxide with a mass percentage concentration of 20%, and adjust the pH value to be between 8;

[0019] 4) Nitrogen protection for 20 minutes;

[0020] 5) Add 1 gram of an initiator with a mass percent concentration of 10%——azobisisobutyronitrile initiator;

[0021] 6) Heat the above solution to 40°C to initiate detonation, keep the temperature for 20 minutes, and obtain a whi...

Embodiment 2

[0023] Embodiment 2: A high-temperature protective glue anti-slump fluid loss agent for drilling fluid, the preparation method of which is:

[0024] 1) Add 40 grams of water to the reaction kettle, add 35 grams of acrylamide, 13 grams of 2-acrylamido-2-methylpropanesulfonic acid, and 4 grams of polyvinylpyrrolidone into the reaction kettle, stir and dissolve to the total mass percentage concentration For a 56% mixed aqueous solution, raise the temperature to 35°C;

[0025] 2) Add 5 grams of dimethyl diallyl ammonium chloride and fully stir to dissolve;

[0026] 3) Add potassium hydroxide aqueous solution with a mass percentage concentration of 20%, and adjust the pH value to 7.5;

[0027] 4) Nitrogen protection for 25 minutes;

[0028] 5) Add 1.5 grams of an initiator with a mass percent concentration of 10%——azobisisobutyronitrile initiator;

[0029] 6) Heat the above solution to 45°C to initiate detonation, keep the temperature for 15 minutes, and obtain a white elastic s...

Embodiment 3

[0031] Embodiment 3: A high-temperature protective glue anti-slump fluid loss agent for drilling fluid, the preparation method of which is:

[0032] 1) Add 45 grams of water to the reaction kettle, add 40 grams of acrylamide, 15 grams of 2-acrylamido-2-methylpropanesulfonic acid, and 5 grams of polyvinylpyrrolidone into the reaction kettle and stir to dissolve to the total mass percentage concentration For a 57% mixed aqueous solution, raise the temperature to 40°C;

[0033] 2) Add 6 grams of dimethyl diallyl ammonium chloride and fully stir to dissolve;

[0034] 3) Add an aqueous solution of potassium hydroxide with a mass percentage concentration of 20%, and adjust the pH value to between 7;

[0035] 4) Nitrogen protection for 30 minutes;

[0036] 5) Add 2 grams of an initiator with a mass percent concentration of 10%——azobisisobutyronitrile initiator;

[0037] 6) Heat the above solution to 40°C to initiate detonation, keep the temperature for 10 minutes, and obtain a whi...

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Abstract

The invention discloses a preparation method of a drilling-fluid-use high-temperature-resistant saturated-salt-resistant filtrate loss reducer. According to the invention, acrylamide, 2-acrylamido-2-methyl propanesulfonic acid, and polyvinyl pyrrolidone are dissolved into a mixed water solution; a temperature is increased to 30-40 DEG C, and dmethyl diallyl ammonium chloride is added; the mixture is sufficiently stirred until dissolved; a potassium hydroxide water solution is added, and a pH value is regulated to 7-8; nitrogen gas is fed for protection; an azodiisobutyronitrile initiator is added and is dissolved by sufficient stirring; implosion is initiated by heating; constant-temperature reaction is carried out; a white elastic solid product is obtained; the product is cut and crushed; constant-temperature drying is carried out; and crushing and sieving are carried out, such that the drilling-fluid-use high-temperature-resistant saturated-salt-resistant filtrate loss reducer is obtained. The product can be used as a saturated brine drilling fluid filtrate loss reducer in a deep well under a high temperature of 220 DEG C. Temperature resistance of the product is improved. High-temperature high-pressure filtrate loss wall building property and salt-calcium corrosion resistance of the drilling fluid are stabilized. The product is suitable to be used in drilling fluids of high-temperature deep-well salt rock strata, gypsum salt beds, and high-water-sensitive shale strata.

Description

technical field [0001] The invention relates to the preparation of an oil field drilling fluid treatment agent, in particular to a preparation method of a high temperature and saturated salt fluid loss reducer for drilling fluid. Background technique [0002] With the deepening of oil and gas drilling, the drilling depth is getting deeper, the formation temperature is getting higher and higher, and the formations encountered are becoming more and more complex, especially the highly water-sensitive mud shale formations, salt rock formations, and salt-gypsum formations. The more it is, the more difficult it is to drill, and higher requirements are placed on the performance of the drilling fluid, especially the temperature resistance and inhibition. In order to effectively solve the problem of wellbore stability during deep well drilling in complex formations, high temperature resistant brine or saturated brine drilling fluids are often used. This requires that the drillin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/02C09K8/035
Inventor 王富华王志遵
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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