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A kind of fluorine-containing oil-based drilling fluid cutting agent and preparation method thereof

An oil-based drilling fluid and cutting agent technology, applied in the chemical field, can solve problems such as difficult cutting force, formation of cuttings bed, high plastic viscosity, etc., and achieve simple post-processing of products, mild reaction conditions, and high monomer conversion rate Effect

Active Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of using oil-based drilling fluid, it is found that the shear force of the system is often too small, especially under the condition of controlling the plastic viscosity, it is very difficult to increase the shear force, which will lead to the settlement of barite and the formation of cuttings bed, which seriously Affects achieving high quality drilling
At present, people mainly increase the shear force of the system by adding organic clay, small molecule organic clay activator, polyamide or polyether compound to the oil-based drilling fluid. The plastic viscosity of the system is too much, the temperature resistance of some cutting agents is not enough, and some cutting agents are only suitable for full oil-based systems, etc.

Method used

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  • A kind of fluorine-containing oil-based drilling fluid cutting agent and preparation method thereof
  • A kind of fluorine-containing oil-based drilling fluid cutting agent and preparation method thereof
  • A kind of fluorine-containing oil-based drilling fluid cutting agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 150g octadecyl acrylate and 10g perfluorohexylethyl acrylate, dissolve in 1000mL dimethyl sulfoxide (DMSO) solvent, stir at room temperature until completely dissolved, then add to the A four-necked flask with a nitrogen tube and a thermometer. Then add 1g of azobisisobutyronitrile (AIBN), stir until dissolved, place in a constant temperature water bath at 25°C, stir and blow nitrogen for 30min, then add a condenser tube with anhydrous calcium chloride drying tube on the top of the flask , the temperature of the system was raised to 60°C and reacted for 12 hours to obtain a uniform viscous mixture. The viscous liquid was added to a mixture of anhydrous ether and anhydrous acetone in the same volume ratio to precipitate a solid, which was dried and pulverized to obtain 143 g of the product.

Embodiment 2

[0036] Weigh 100g of octadecyl acrylate and 1g of perfluorohexylethyl acrylate, dissolve in 1000mL dimethyl sulfoxide (DMSO) solvent, stir at room temperature until completely dissolved, then add to the A four-necked flask with a nitrogen tube and a thermometer. Then add 1g of azobisisobutyronitrile (AIBN), stir until dissolved, place in a constant temperature water bath at 25°C, stir and blow nitrogen for 25min, then add a condenser tube with anhydrous calcium chloride drying tube on the top of the flask , the temperature of the system was raised to 50°C and reacted for 4 hours to obtain a uniform viscous mixture. The viscous liquid was added to a mixture of anhydrous ether and anhydrous acetone at the same volume ratio to precipitate a solid, which was dried and pulverized to obtain 93 g of the product.

Embodiment 3

[0038] Weigh 300g octadecyl acrylate and 60g perfluorohexyl ethyl acrylate, dissolve in 1000mL dimethyl sulfoxide (DMSO) solvent, stir at room temperature until completely dissolved, then add to the A four-necked flask with a nitrogen tube and a thermometer. Then add 10g of azobisisobutyronitrile (AIBN), stir until dissolved, place in a constant temperature water bath at 25°C, stir and pass nitrogen gas for 35min, and then add a condenser tube with anhydrous calcium chloride drying tube on the top of the flask , the temperature of the system was raised to 80°C and reacted for 36 hours to obtain a uniform viscous mixture. The viscous liquid was added to a mixture of anhydrous ether and anhydrous acetone at the same volume ratio to precipitate a solid, which was dried and pulverized to obtain 310 g of the product.

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Abstract

The invention provides a fluorine-containing oil-based drilling fluid extracting and cutting agent and a preparation method thereof. The preparation method comprises the following steps according to the ratio: a, adding 10-300g of acrylic ester and 0.1-60g of perfluoroalkyl ethyl acrylic ester into 1L of dimethyl sulfoxide solvent, and stirring at room temperature until acrylic ester and perfluoroalkyl ethyl acrylic ester are completely dissolved; b, adding 0.1-10g of azodiisobutyronitrile into a dissolved solution obtained in the step a, stirring until azodiisobutyronitrile is dissolved, then placing the dissolved solution in a thermostatic waterbath at the temperature of 25 DEG C, stirring and introducing nitrogen for 25-35 minutes; c, increasing temperature of a solution obtained in the step b to 50-80 DEG C, and reacting for 4-36 hours to obtain a polymer solution; and d, placing the polymer solution obtained in the step c into a mixed solution of absolute acetone and absolute ether in volume ratio of 1:1, and drying and smashing sediments to obtain the fluorine-containing oil-based drilling fluid extracting and cutting agent product.

Description

Technical field: [0001] The invention relates to the field of chemical technology, in particular to a fluorine-containing oil-based drilling fluid cutting agent and a preparation method thereof. Background technique: [0002] Oil-based drilling fluid has the advantages of strong inhibition, anti-corrosion, anti-pollution, good lubricity, good wellbore stability, good temperature resistance and protection of oil layers, and has been widely used. Shear force is one of the key rheological parameters that determine the performance of oil-based drilling fluids. It directly affects rock-carrying properties, anti-subsidence, equivalent circulation density, excitation and suction pressure, etc. Only when the shear force is properly controlled and kept stable can successful drilling of complex drilling fluids be achieved. Wells, especially deep sea wells, high temperature and high pressure wells and wellbore with narrow safety window. In the process of using oil-based drilling fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/32C08F220/18C08F220/24
Inventor 曹杰郭保雨邱正松宫新军王宝田王彦玲何兴华郭祥鹃蒋莉刘佑云肖党林肖林通
Owner CHINA PETROLEUM & CHEM CORP