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Modified barium sulfate weighting agent for ultrahigh-temperature water-based drilling fluid, preparation method thereof and ultrahigh-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, and achieve the effects of stable performance, slowing down settling tendency, and easy control of reaction conditions

Active Publication Date: 2020-11-10
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 ultrahigh-temperature water-based drilling fluid, preparation method thereof and ultrahigh-temperature water-based drilling fluid
  • Modified barium sulfate weighting agent for ultrahigh-temperature water-based drilling fluid, preparation method thereof and ultrahigh-temperature water-based drilling fluid
  • Modified barium sulfate weighting agent for ultrahigh-temperature water-based drilling fluid, preparation method thereof and ultrahigh-temperature water-based drilling fluid

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preparation example Construction

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

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

[0044] (2) In the presence of an acid and a catalyst, the barium sulfate, biomass and solvent are subjected to a hydrothermal reaction 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, carboxyl, and sulfonic acid groups, 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 sul...

Embodiment 1

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

[0088] (1) Take 30g of sodium sulfate, stir and dissolve it in 200mL of ammonia water (concentration is 20% by mass), and slowly add 288mL of 25% anhydrous barium chloride solution dropwise at a speed of 5mL / min by using a peristaltic pump to react Set the temperature at 10°C and stir at 5,000rpm for 40min; after the reaction, centrifuge the suspension at 10,000rpm for 20min to obtain an off-white precipitate, wash it with deionized water three times, and dry it at 80°C to obtain barium sulfate with an average particle size of 318.2nm .

[0089] (2) Weigh 30g of barium sulfate and disperse it into 300mL of deionized water at high speed. Add 100g glucose, 80g fructose, 18g citric acid, 9g FeCl 2 and spread it evenly. It was transferred to a polytetrafluoroethylene-lined hydrothermal reactor and placed in a roller furnace. Set the heating tem...

Embodiment 2

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

[0096] (1) Weigh 24g of sodium sulfate, stir and dissolve it in 200mL of ammonia water (concentration is 10% by mass), and slowly add 160mL of 25% anhydrous barium chloride solution dropwise at a speed of 7mL / min using a peristaltic pump to react Set the temperature at 10°C and stir at 4,000rpm for 30min; after the reaction, centrifuge the suspension at 10,000rpm for 20min to obtain an off-white precipitate, wash it with deionized water three times, and dry it 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 3 and spread it evenly. It was transferred to a polytetrafluoroethylene-lined hydrothermal reactor and placed in a roller furnace. Set the heating temperature of...

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Abstract

The invention relates to the field of oilfield chemistry, and discloses a modified barium sulfate weighting agent for an ultrahigh-temperature water-based drilling fluid, a preparation method thereofand the ultrahigh-temperature water-based drilling fluid. The modified barium sulfate weighting agent comprises barium sulfate and amorphous carbon loaded on the barium sulfate, and based on the totalweight of the modified barium sulfate weighting agent, the content of the amorphous carbon in terms of carbon element is 2-20 wt%. The modified barium sulfate weighting agent has excellent dispersionstability and a high zeta potential absolute value.

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 being exhausted day by day, and the oil and gas resources in the deep and ultra-deep layers have become an important replacement field. In the process of drilling deep and ultra-deep oil and gas resources, higher performance requirements are put forward for drilling fluids. Among them, the regulation of rheology and settlement stability of water-based drilling fluid under ultra-high temperature and high density conditions is the most prominent problem. During the use of conventional API barite, rheology is difficult to control, and serious problems such as settlement and pipe sticking cau...

Claims

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Application Information

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Patent Type & Authority Applications(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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