Preparation method of high-temperature high-density water-based drilling fluid filtrate reducer composition

A technology of water-based drilling fluid and fluid loss reducing agent, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problems of high temperature and high density drilling fluid, fluid loss reduction, viscosity increase and flocculation, and drilling fluid system. Limited and other problems, to achieve the effect of being beneficial to rheology, improving motion resistance, and preventing curling

Pending Publication Date: 2022-07-12
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of polymer is a linear polymer compound, and its main chain and the connection between the hydrophilic group and the main chain are all C-C bonds. It has good thermal stability, but it can increase viscosity and flocculate while reducing fluid loss, which cannot meet the requirements. High-temperature and high-density drilling fluid needs, currently mainly suitable for low-solid low-density drilling fluid system
In recent years, organosilicon fluorine fluid loss reducers formed by modification with methyl chlorosilane as the main composition have been applied in the drilling of high temperature wells in Liaohe, Shengli and Daqing oilfields successively, but this type of fluid loss The cost of the agent is high, and the applicable drilling fluid system is limited

Method used

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  • Preparation method of high-temperature high-density water-based drilling fluid filtrate reducer composition
  • Preparation method of high-temperature high-density water-based drilling fluid filtrate reducer composition
  • Preparation method of high-temperature high-density water-based drilling fluid filtrate reducer composition

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Embodiment 1

[0038] Embodiment 1: a kind of preparation method of high temperature and high density water-based drilling fluid fluid loss control agent composition, the steps are as follows:

[0039] S1, low molecular weight linear polymer preparation: respectively weigh 85 parts of acrylamide (AM), 5 parts of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 5 parts of N-vinylpyrrolidone, 5 parts of methyl Acryloyloxyethyltrimethylammonium chloride (DMC) (the total mass of the four monomers accounts for 30% of the mass of the reaction system), azobisisobutyronitrile (0.5% of the total mass of the monomers) (decomposition temperature 45~ 65°C), 5% isopropanol was used as the polymerization inhibitor, and the rest was deionized water.

[0040] First, acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), N-vinylpyrrolidone, methacryloyloxyethyltrimethylammonium chloride (DMC) were added to the condenser pipe, mechanical stirring and constant pressure dropping funnel; then add dei...

Embodiment 2

[0046] Embodiment 2: a kind of preparation method of high temperature and high density water-based drilling fluid fluid loss control agent composition, the steps are as follows:

[0047] S1. Preparation of low molecular weight linear polymer: Weigh 90 parts of acrylic acid, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid (AMPS), 5 parts of divinylpyridine, 5 parts of dimethyldiallyl respectively Ammonium chloride (DMDAAC) (the total mass of the four monomers accounts for 40% of the mass of the reaction system), the dibenzoyl peroxide initiator accounts for 0.5% of the mass of the reaction system, the polymerization inhibitor is 10% of ethanol, and the rest is deionized water.

[0048] First, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), divinylpyridine, and dimethyldiallylammonium chloride (DMDAAC) were added to the equipment equipped with a condenser, mechanical stirring and constant pressure. Add it to the three-necked flask of the dropping funnel, th...

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Abstract

The invention discloses a preparation method of a high-temperature and high-density water-based drilling fluid filtrate reducer composition, which belongs to the technical field of oilfield chemical agents, and is characterized in that the filtrate reducer composition is formed by combining a low-molecular-weight linear polymer and temperature-sensitive polymer particle microspheres, the preparation method of the low-molecular-weight linear polymer comprises the following steps: reacting an acrylamide hydrophilic monomer, a sulfonic acid group-containing temperature-resistant monomer, a rigid hydrophobic monomer, a cationic monomer, an initiator I and a polymerization inhibitor under a deoxidizing condition, washing a reaction product, drying and crushing to obtain the low-molecular-weight linear polymer. The preparation method of the temperature-sensitive polymer particle microspheres comprises the following steps: dissolving a temperature-sensitive monomer, a cationic monomer, a dispersing agent, a cross-linking agent and an initiator II in a mixed solution of deionized water and polyethylene glycol, reacting under a deoxidizing condition, and washing and drying a reaction product to obtain the polymer particle microspheres. The method is mainly used for synthesizing the high-temperature high-density water-based drilling fluid filtrate reducer composition.

Description

technical field [0001] The invention relates to a drilling fluid additive in the technical field of oilfield chemicals, in particular to a preparation method of a high temperature and high density water-based drilling fluid fluid loss control agent composition. Background technique [0002] As the exploration and development of oil and gas resources in my country gradually develops into deep and ultra-deep layers, the technology of high-temperature and high-density water-based drilling fluids has become one of the key technologies in drilling engineering. Due to the high drilling pressure and temperature, the density of the drilling fluid is required to be high (density at least 2.50g / cm 3 ), strong temperature resistance (at least above 200 ℃), low filtration loss (high temperature and high pressure water loss less than 10ml). If the high temperature and high density drilling fluid fluid loss reducer does not meet the requirements of temperature resistance, the high temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/58C08F226/10C08F220/34C08F220/54C08F220/06C08F226/02C08F226/06
CPCC09K8/035C08F220/56C08F220/54C08F220/06C08F220/585C08F226/10C08F220/34C08F226/02C08F226/06
Inventor 马超周会利谢龙龙
Owner YANGTZE UNIVERSITY
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