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Ultrahigh-temperature high-density drilling fluid, preparation method and application thereof

A drilling fluid and ultra-high temperature technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult adjustment and maintenance, barite settlement, large water loss, etc.

Pending Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the first aspect of the present invention provides an ultra-high temperature and high-density drilling fluid system with excellent performance, using ultra-high temperature fluid loss reducer and high-temperature resistant high-density dispersant as the core treatment agent, the density reaches 2.40g / cm 3 , and the temperature resistance can reach 240℃, which can realize the regulation of high temperature rheology and settlement stability of drilling fluid and the effective control of high temperature and high pressure filtration loss, and solve the problems of poor rheology and difficulty in drilling fluid in deep ultra-high temperature and high pressure formation environment. Control and maintenance, high temperature and high pressure water loss, barite settlement and other issues, to avoid complex underground

Method used

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  • Ultrahigh-temperature high-density drilling fluid, preparation method and application thereof
  • Ultrahigh-temperature high-density drilling fluid, preparation method and application thereof
  • Ultrahigh-temperature high-density drilling fluid, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The density is 2.40g / cm 3 The ultra-high-temperature high-density drilling fluid component distribution ratio is as follows with water as 100 parts by weight:

[0059]

[0060] Prepare sodium bentonite slurry according to the above component ratio, after aging for 24 hours, add ultra-high temperature fluid loss reducer SMPFL-UP under high stirring, and add dispersant SMS-H, sulfonated lignite, lignite resin, lubricant SMJH after dissolving evenly -1. Anti-slump agent SMNA-1, sodium hydroxide, stir until dissolved evenly, add barite powder under stirring, and test the performance of the drilling fluid before aging after stirring at high speed for 20 minutes. The ultra-high temperature and high density drilling fluid prepared according to the above method was put into a high temperature aging tank, rolled at 220°C, and cooled to 55°C to test the performance of the drilling fluid after aging. The performance of the ultra-high temperature and high density drilling fluid...

Embodiment 2

[0065] The density is 2.20g / cm 3 The ultra-high-temperature high-density drilling fluid component distribution ratio is as follows with water as 100 parts by weight:

[0066]

[0067]

[0068] Prepare sodium bentonite slurry according to the above component ratio, after aging for 24 hours, add ultra-high temperature fluid loss reducer SMPFL-UP under high stirring, and add dispersant SMS-H, sulfonated lignite, lignite resin, lubricant SMJH after dissolving evenly -1. Anti-slump agent SMNA-1, sodium hydroxide, stir until dissolved evenly, add barite powder under stirring, and test the performance of the drilling fluid before aging after stirring at high speed for 20 minutes. The ultra-high temperature and high-density drilling fluid prepared by the above method was put into a high-temperature aging tank, rolled at 240°C, and cooled to 55°C to test the performance of the drilling fluid after aging. The performance of the ultra-high temperature and high density drilling flu...

Embodiment 3

[0073] The density is 2.40g / cm 3 The ultra-high-temperature high-density drilling fluid component distribution ratio is as follows with water as 100 parts by weight:

[0074]

[0075]

[0076] Prepare sodium bentonite slurry according to the above component ratio, after aging for 24 hours, add ultra-high temperature fluid loss reducer SMPFL-UP under high stirring, and add dispersant SMS-H, sulfonated lignite, lignite resin, lubricant SMJH after dissolving evenly -1. Anti-slump agent SMNA-1, sodium hydroxide, stir until dissolved evenly, add barite powder under stirring, and test the performance of the drilling fluid before aging after stirring at high speed for 20 minutes. The ultra-high temperature and high-density drilling fluid prepared by the above method was put into a high-temperature aging tank, rolled at 240°C, and cooled to 55°C to test the performance of the drilling fluid after aging. The performance of the ultra-high temperature and high density drilling flu...

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Abstract

The invention relates to an ultrahigh-temperature high-density drilling fluid, which comprises a high-temperature-resistant dispersing agent, an ultrahigh-temperature filtrate reducer, a lubricating agent and an anti-collapse agent. The drilling fluid can resist a temperature of 240DEG C at the density of 2.4g / cm<3>, has good sedimentation stability and rheological property, is low in high-temperature and high-pressure water loss and good in high-temperature stability, and can be used for drilling construction of high-temperature and high-pressure stratums.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development drilling, and in particular relates to an ultra-high-temperature high-density drilling fluid and a preparation method and application thereof. Background technique [0002] As the world's energy demand continues to increase, drilling targets are gradually shifting to deep formations, and during the drilling process of deep formations, there is a greater chance of encountering ultra-high temperature and high pressure formations. In the deep ultra-high temperature and high pressure formation environment, drilling fluid generally has problems such as poor rheology and difficult control, increased high temperature and high pressure water loss, and barite subsidence, which lead to downhole complications. [0003] In foreign countries, in terms of high-temperature-resistant and high-density water-based drilling fluid technology, the maximum application temperature is 243°C, and the...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 杨小华金军斌王琳李雄林永学杨帆王海波
Owner CHINA PETROLEUM & CHEM CORP
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