Filtrate reducer zwitterionic polymer for drilling fluid

A technology of fluid loss reducer and zwitterion, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temperature resistance, easy decomposition of fluid loss reducer, and high price of fluid loss reducer.

Inactive Publication Date: 2020-10-27
ANHUI LUHAI PETROLEUM AUX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing fluid loss control agents for drilling fluids generally have the following deficiencies: 1. The temperature resistance is poor, and the fluid loss agents are prone to decompose at higher temperatures, resulting in weakening of the fluid loss control effect. In order to increase its fluid loss control effect, It is necessary to increase the dosage of fluid loss additives, resulting in increased production cos...

Method used

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  • Filtrate reducer zwitterionic polymer for drilling fluid
  • Filtrate reducer zwitterionic polymer for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Drilling fluid fluid loss reducer zwitterionic polymer, including the following raw materials in parts by weight: 90 parts of polyacrylamide, 30 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of dimethyl propyl ammonium chloride , 10 parts of sodium styrene sulfonate, 0.3 parts of initiator, 200 parts of deionized water, 50 parts of sodium hydroxide solution with a mass fraction of 40%, 20 parts of modified tapioca starch, 10 parts of modified conch shell powder, ethylene glycol 300 copies;

[0033] The preparation method of the fluid loss reducer zwitterionic polymer for this drilling fluid is as follows:

[0034] The first step is to divide the deionized water into two parts a and b according to the volume ratio of 1:3, and dissolve 2-acrylamide-2-methylpropanesulfonic acid and deionized water of part a in the reactor. Stir at 100r / min for 30min, then cool for 1h, then gradually add 40% sodium hydroxide solution to the reactor to adjust the pH to 7 to ob...

Embodiment 2

[0051] Drilling fluid fluid loss reducer zwitterionic polymer, including the following raw materials in parts by weight: 100 parts of polyacrylamide, 35 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10 parts of dimethyl propyl ammonium chloride , 13 parts of sodium styrene sulfonate, 0.7 parts of initiator, 250 parts of deionized water, 55 parts of 40% sodium hydroxide solution by mass fraction, 35 parts of modified tapioca starch, 15 parts of modified conch shell powder, ethylene glycol 350 copies;

[0052] The preparation method of the fluid loss reducer zwitterionic polymer for this drilling fluid is as follows:

[0053] The first step is to divide the deionized water into two parts a and b according to the volume ratio of 1:3, and dissolve 2-acrylamide-2-methylpropanesulfonic acid and deionized water of part a in the reactor. Stir at 150r / min for 40min, then cool for 1.5h, then gradually add 40% sodium hydroxide solution to the reactor to adjust the pH to 7 to obtai...

Embodiment 3

[0070] Drilling fluid fluid loss reducer zwitterionic polymer, including the following raw materials in parts by weight: 110 parts of polyacrylamide, 40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 15 parts of dimethyl propyl ammonium chloride , 15 parts of sodium styrene sulfonate, 1 part of initiator, 300 parts of deionized water, 60 parts of sodium hydroxide solution with a mass fraction of 40%, 50 parts of modified tapioca starch, 20 parts of modified conch shell powder, ethylene glycol 500 copies;

[0071] The preparation method of the fluid loss reducer zwitterionic polymer for this drilling fluid is as follows:

[0072] The first step is to divide the deionized water into two parts a and b according to the volume ratio of 1:3, and dissolve 2-acrylamide-2-methylpropanesulfonic acid and deionized water of part a in the reactor. Stir at 200r / min for 50min, then cool for 2h, then gradually add 40% mass fraction of sodium hydroxide solution to the reactor to adjust p...

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Abstract

The invention discloses a filtrate reducer zwitterionic polymer for a drilling fluid. The filtrate reducer zwitterionic polymer is prepared from the following raw materials: polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, dimethyl propyl ammonium chloride, sodium p-styrenesulfonate, an initiator, deionized water, a sodium hydroxide solution with the mass fraction of 40%, modified cassava starch, modified shellfish shell powder and ethylene glycol. A hydration group and an adsorption group are arranged on a molecular chain of the acrylamide copolymer, so that the adsorption capacityis high; 2-acrylamide-2-methylpropanesulfonic acid contains sulfonate radicals of ionizable groups, the hydration effect with clay particles is improved, and the tolerance to salt and calcium can be improved, so that the drilling fluid is stabilized; a cationic group is introduced into a molecular chain of dimethyl propyl ammonium chloride, so that the improvement of the blocking inhibition effectwith clay particles is facilitated. The filtrate reducer provided by the invention has good temperature resistance and salt resistance, is suitable for fresh water and saline water drilling fluid systems with various concentrations, is biodegradable, and has no pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of additives for drilling fluids, and in particular relates to a fluid loss control amphoteric ion polymer for drilling fluids. Background technique [0002] Drilling fluid is the circulating medium used in the drilling process. During the drilling process, the drilling fluid mainly completes the tasks of suspension, pressure control, rock formation stability, buoyancy, lubrication and cooling. During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the wellbore wall, causing the drilling fluid to lose water. [0003] In the prior art, fluid loss control is mostly realized by adding a fluid loss reducer to the drilling fluid. At present, there are many kinds of fluid loss control agents used in drilling sites, such as minerals, natural organic substances and their modified substances, and synthetic organic substances. Howe...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/24C08F265/10C08F220/58C08F212/14
CPCC08F265/10C09K8/03C09K8/24C08F220/585C08F212/30
Inventor 柳云涛
Owner ANHUI LUHAI PETROLEUM AUX TECH
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