Lubricating and plugging filtrate reducer for drilling fluid and preparation method of lubricating and plugging filtrate reducer

A technology of fluid loss control agent and drilling fluid, which is applied in the field of drilling fluid, can solve the problems of ineffective fluid loss control, poor environmental protection, environmental impact, etc., to improve temperature resistance and salt resistance, easy to control, and enhance plugging performance Effect

Pending Publication Date: 2022-07-01
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent authorization number ZL 201510249404.9 proposes a lubricating and plugging agent for drilling fluid, which is composed of water, bentonite, lubricant, stabilizer, asphalt, antifreeze, surfactant, and defoamer. The product has good Plugging performance, lubricity and certain fluid loss reduction effect, but the temperature resistance is only up to 120°C, the fluid loss reduction effect is not outstanding, and asphalt and asphalt modifier have a great impact on the environment, and the environmental protection is poor

Method used

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  • Lubricating and plugging filtrate reducer for drilling fluid and preparation method of lubricating and plugging filtrate reducer
  • Lubricating and plugging filtrate reducer for drilling fluid and preparation method of lubricating and plugging filtrate reducer
  • Lubricating and plugging filtrate reducer for drilling fluid and preparation method of lubricating and plugging filtrate reducer

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0017] The lubricating plugging fluid loss control agent for drilling fluid is prepared according to the following method:

[0018] (1) Oil phase preparation:

[0019] Under normal temperature conditions, add 70 parts of white oil and 30 parts of paraffin into the reaction kettle, slowly add 15 parts of compound emulsifier under stirring at 90 r / min, and stir for 50 min to obtain an oil phase, which is for later use;

[0020] (2) Water phase preparation:

[0021] Add 80 parts of water to another reaction kettle, turn on stirring, the rotating speed is 90r / min, stir for 30min, then slowly add 8 parts of acrylic acid, 9 parts of acrylamide, 8 parts of 2-acrylamido-2-methylpropanesulfonic acid parts, 6 parts of styrene, 0.6 part of graphene oxide, adjust the pH value to 7, stir for 50min to obtain an aqueous phase, for subsequent use;

[0022] (3) Aggregation:

[0023] The water phase obtained in step (2) was slowly added to the oil phase obtained in step (1), the stirring spe...

specific Embodiment 2

[0024] The lubricating plugging fluid loss control agent for drilling fluid is prepared according to the following method:

[0025] (1) Oil phase preparation:

[0026] Under normal temperature conditions, add 70 parts of white oil and 30 parts of paraffin into the reaction kettle, slowly add 20 parts of compound emulsifier under stirring at 90 r / min, and stir for 50 min to obtain an oil phase, which is for later use;

[0027] (2) Water phase preparation:

[0028] Add 80 parts of water to another reaction kettle, turn on stirring, the rotating speed is 90r / min, stir for 30min, then slowly add 9 parts of acrylic acid, 10 parts of acrylamide, 9 parts of 2-acrylamido-2-methylpropanesulfonic acid parts, 7 parts of styrene, 0.8 parts of graphene oxide, adjust the pH value to 7, stir for 50min to obtain an aqueous phase, for subsequent use;

[0029] (3) Aggregation:

[0030] The water phase obtained in step (2) was slowly added to the oil phase obtained in step (1), the stirring spe...

specific Embodiment 3

[0031] The lubricating plugging fluid loss control agent for drilling fluid is prepared according to the following method:

[0032] (1) Oil phase preparation:

[0033] Under normal temperature conditions, add 80 parts of white oil and 20 parts of paraffin into the reaction kettle, slowly add 15 parts of compound emulsifier under stirring at 90 r / min, and stir for 50 min to obtain an oil phase, which is for later use;

[0034] (2) Water phase preparation:

[0035] Add 90 parts of water to another reaction kettle, turn on stirring, the rotating speed is 90r / min, stir for 40min, then slowly add 8 parts of acrylic acid, 9 parts of acrylamide, 8 parts of 2-acrylamido-2-methylpropanesulfonic acid parts, 6 parts of styrene, 0.6 part of graphene oxide, adjust the pH value to 7, stir for 60min to obtain an aqueous phase, for subsequent use;

[0036] (3) Aggregation:

[0037] The water phase obtained in step (2) was slowly added to the oil phase obtained in step (1), the stirring spe...

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Abstract

The invention relates to the field of treating agents for drilling fluids, in particular to a lubricating and plugging filtrate reducer for a drilling fluid and a preparation method of the lubricating and plugging filtrate reducer. Comprising 31 to 35 parts of a functional monomer, 0.6 to 0.8 part of graphene oxide, 80 to 100 parts of water, 70 to 80 parts of an oil phase dispersion medium, 20 to 30 parts of paraffin, 15 to 20 parts of a composite emulsifier and 1.0 to 1.5 parts of an initiator. The functional monomers comprise acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and styrene. The compound emulsifier is formed by mixing Span80 and Tween 80; the weight ratio of the Span80 to the Tween 80 is 1: 1. And the oil phase medium is white oil or diesel oil. The initiator is a composition of ammonium persulfate and sodium hydrogen sulfite. The preparation method of the lubricating plugging filtrate reducer for the drilling fluid is a reverse emulsion polymerization method. The lubricating plugging agent has a wide particle size distribution range, can effectively plug microcracks with different sizes to form a high-lubricity isolating membrane, has lubricating performance, plugging performance and filtrate loss reduction performance, can resist the temperature of 220 DEG C, can resist NaCl to be saturated, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a lubricating plugging fluid loss control agent for drilling fluids and a preparation method thereof. Background technique [0002] The drilling fluid lubricant is used to improve the lubricity of the drilling fluid, reduce the friction between the well wall and the drilling tool, reduce the rotational torque of the drill string and the tripping resistance, thereby reducing the occurrence of stuck pipe accidents. The lubricants currently used are mostly made of graphite, plastic pellets, mineral oil or vegetable oil, but usually do not have the ability to block and reduce filtration. [0003] The plugging agent for drilling fluid is a kind of drilling fluid treatment agent used to block formation pores and cracks, prevent drilling fluid and its filtrate from invading the formation, and maintain wellbore stability. At present, various plugging agents used in drilling flui...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/42
CPCC09K8/03C09K8/426C09K2208/34
Inventor 李琼李秀灵刘均一王宝田严波郑成胜赵怀珍王莉萍葛庆颖
Owner SINOPEC SSC
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