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Modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid and preparation method thereof, and ultra-high temperature water-based drilling fluid

A water-based drilling fluid, barium sulfate technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor suspension performance, achieve stable performance, improve dispersion stability, and be easy to industrialize.

Active Publication Date: 2022-07-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid and its preparation in order to overcome the problem of poor dispersion and suspension performance of the weighting agent for water-based drilling fluid in the prior art under ultra-high temperature conditions method and ultra-high temperature water-based drilling fluid, the modified barium sulfate weighting agent still has excellent dispersion stability after high-temperature rolling at 220°C, and the absolute value of the zeta potential of the modified barium sulfate weighting agent is significantly improved

Method used

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  • Modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid and preparation method thereof, and ultra-high temperature water-based drilling fluid
  • Modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid and preparation method thereof, and ultra-high temperature water-based drilling fluid
  • Modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid and preparation method thereof, and ultra-high temperature water-based drilling fluid

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preparation example Construction

[0042] The second aspect of the present invention provides a preparation method of the aforementioned modified barium sulfate weighting agent, wherein the preparation method comprises the following steps:

[0043] (1) sulfate and barium salt are contacted in ammonia-rich solvent to obtain barium sulfate;

[0044] (2) in the presence of an acid and a catalyst, hydrothermally react the barium sulfate, biomass and solvent to obtain a modified barium sulfate weighting agent.

[0045] In the present invention, the surface of the modified barium sulfate weighting agent prepared by hydrothermal reaction is rich in oxygen-containing functional groups such as hydroxyl group, carboxyl group and sulfonic acid group, which can significantly improve the dispersion stability of the modified barium sulfate weighting agent at high temperature.

[0046] According to the present invention, in step (1), the sulfate is selected from one or more of sodium sulfate, ammonium sulfate, potassium sulfa...

Embodiment 1

[0087] This example is to illustrate the modified barium sulfate weighting agent prepared by the method of the present invention.

[0088] (1) take by weighing 30g sodium sulfate, be dissolved in 200mL ammonia water (concentration is 20 mass %) with high-speed stirring, adopt peristaltic pump to slowly drip 288mL 25% anhydrous barium chloride solution therein with the speed of 5mL / min, by reaction The temperature was set at 10°C and stirred at 5000rpm for 40min; after the reaction, the suspension was centrifuged at 10000rpm for 20min to obtain off-white precipitate, which was washed 3 times with deionized water and dried at 80°C to obtain barium sulfate with an average particle size of 318.2nm .

[0089] (2) Weigh 30 g of barium sulfate and disperse it into 300 mL of deionized water at high speed. Add 100g glucose, 80g fructose, 18g citric acid, 9g FeCl in turn 2 and disperse it evenly. It was transferred to a hydrothermal reactor lined with Teflon and placed in a roller he...

Embodiment 2

[0095] This example is to illustrate the modified barium sulfate weighting agent prepared by the method of the present invention.

[0096] (1) take by weighing 24g sodium sulfate, be dissolved in 200mL ammonia water (concentration is 10 mass %) with high-speed stirring, adopt peristaltic pump to slowly drip 160mL 25% anhydrous barium chloride solution therein with the speed of 7mL / min, by reaction The temperature was set to 10°C and stirred at 4000rpm for 30min; after the reaction, the suspension was centrifuged at 10000rpm for 20min to obtain an off-white precipitate, washed three times with deionized water, and dried at 80°C to obtain barium sulfate with an average particle size of 512.4nm .

[0097] (2) Weigh 20 g of barium sulfate and disperse it into 300 mL of deionized water at high speed. Add 20g lignin, 15.6g acrylic acid, 7.2g FeCl in turn 3 and disperse it evenly. It was transferred to a hydrothermal reactor lined with Teflon and placed in a roller heating furnace...

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Abstract

The invention relates to the field of oilfield chemistry, and discloses a modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid, a preparation method thereof, and the ultra-high temperature water-based drilling fluid. The modified barium sulfate weighting agent includes barium sulfate and amorphous carbon supported on the barium sulfate, and based on the total weight of the modified barium sulfate weighting agent, the amorphous carbon is calculated in terms of carbon element. The content is 2-20% by weight. The modified barium sulfate weighting agent has excellent dispersion stability and high absolute value of zeta potential.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a modified barium sulfate weighting agent for ultra-high temperature water-based drilling fluid, a preparation method thereof, and an ultra-high temperature water-based drilling fluid. Background technique [0002] At present, the oil resources in the middle and shallow layers of the world are gradually depleted, and the oil and gas resources in the deep and ultra-deep layers have become an important replacement area. During the drilling of deep and ultra-deep oil and gas resources, higher performance requirements are placed on drilling fluids. Among them, the regulation of water-based drilling fluid rheology and settlement stability under ultra-high temperature and high density conditions is the most prominent problem. Conventional API barite often has serious problems such as difficult to control rheology during use, sedimentation and sticking caused by the failure of the tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/16
CPCC09K8/16
Inventor 钟汉毅高鑫邱正松黄维安孔祥政王帝单锴
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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