High-temperature-resistant drilling fluid as well as preparation method and application thereof

A technology of high temperature resistance and drilling fluid, which is applied in chemical instruments and methods, earthwork drilling, and flushing of wellbore, etc. It can solve the problems of water loss, wall building and inhibition, high temperature dispersion of bentonite, and rheological control of drilling fluid. Difficulty and other issues

Pending Publication Date: 2020-06-16
CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using bentonite to prepare high-temperature drilling fluid, because bentonite is prone to high-temperature dispersion, it is difficult to control the rheology of the drilling fluid, and the water loss and wall-building properties need to be further improved.

Method used

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  • High-temperature-resistant drilling fluid as well as preparation method and application thereof
  • High-temperature-resistant drilling fluid as well as preparation method and application thereof
  • High-temperature-resistant drilling fluid as well as preparation method and application thereof

Examples

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preparation example Construction

[0041] The raw materials for the preparation of the high temperature resistant drilling fluid provided by the present invention preferably further include a weighting agent for increasing the density of the drilling fluid. The present invention has no special requirements on the amount of the weighting agent, and those skilled in the art can add it according to the density requirement of the high temperature resistant drilling fluid. The drilling fluid density of the present invention has strong adaptability and can be increased to 1.5g / cm 3 The above can effectively deal with high geostress formations. In the present invention, the weighting agent is preferably barite, and the present invention has no special limitation on barite, and any barite conforming to GB / T 5005-2010 drilling fluid material specification is applicable to the present invention. For example, barite powder produced by Hubei Longhai Chemical Co., Ltd., Puyang Longze Chemical Construction General Factory, ...

Embodiment 1

[0052] Add 2 grams of attapulgite, 4 grams of inorganic tackifier (select sepiolite soil powder) and 0.1 gram of alkalinity regulator (select NaOH) to 100 mL of water, and leave it for 24 hours after high-speed shearing for 20 minutes to make the soil powder fully water disperse to obtain a base slurry, recorded as 2% attapulgite + 4% inorganic tackifier + 0.1% NaOH. Among them, the meaning of 2% is: add 2 grams of slurry mixing materials to 100 mL of water, and the percentages appearing in subsequent formulas all have the same meaning. Keep stirring the base slurry, and add 0.6% high temperature resistant polymer fluid loss reducer SO-1, 4% high temperature resistant sulfonated fluid loss reducer OCL-JA, 4% high temperature resistant anti-slump agent Soltex, 5% high temperature stable agent HCOOK, 0.5% oxygen scavenger Na 2 SO 3 After stirring evenly, the high temperature resistant drilling fluid can be obtained.

[0053] The formula is recorded as: 2% attapulgite + 4% ino...

Embodiment 2

[0055] The difference from Example 1 is that the formula is: 2% attapulgite+4% inorganic tackifier+0.1%NaOH+0.6%SO-1+4%OCL-JA+3%Soltex+5%HCOOK+0.5 %Na 2 SO 3 +110% Barite.

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Abstract

The invention relates to a high-temperature-resistant drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The high-temperature-resistant drilling fluid is prepared from the following preparation raw materials in parts by mass: 100 parts of water, 2-4 parts of attapulgite, 3-6 parts of an inorganic tackifier, 0.05-0.15 partof an alkalinity regulator, 0.4-1.0 part of a high-temperature-resistant polymer filtrate reducer, 3-6 parts of a high-temperature-resistant sulfonated filtrate reducer, 2-5 parts of a high-temperature-resistant anti-collapse agent, 3-8 parts of a high-temperature stabilizer and 0.3-1.0 part of a deoxidant. The drilling fluid provided by the invention has good rheological property, and can maintain stable performance under a long-term high-temperature condition; besides, the drilling fluid has good wall-building property, inhibition property and anti-pollution capability under the conditions of high temperature and high pressure, is beneficial to well wall stability, can overcome the possible influence of abnormal temperature and pressure, complex stratums and the like in deep wells and construction on the performance of the drilling fluid, and can be suitable for various drilling engineering.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a high temperature resistant drilling fluid and its preparation method and application. Background technique [0002] Drilling fluid is an important engineering slurry used in the drilling process. It has many important functions such as carrying cuttings, stabilizing the well wall, and lubricating drilling tools. In recent years, with the development of oil and gas exploration and production toward deeper formations, the vigorous advancement of my country's scientific drilling projects, and the rapid development of new high-temperature thermal energy storage such as hot dry rocks, more high-temperature-resistant drilling fluids suitable for high-temperature environments have been proposed. high demands. Drilling fluid is an important part of drilling engineering, and its performance directly affects the drilling quality, drilling cost and drilling cycle of high-temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24E21B21/00
CPCC09K8/24E21B21/00
Inventor 乌效鸣郑文龙许洁朱永宜朱旭明王稳石张恒春林朋皓
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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