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Water-based drilling fluid with high suppression and lubrication performance and preparation method thereof

A water-based drilling fluid and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high biological toxicity, application restrictions, poor compatibility, etc., achieve low solid content, reduce drill mud Packing and lubricating performance excellent effect

Inactive Publication Date: 2012-05-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the cationic drilling fluid system is mainly composed of low molecular weight quaternary ammonium salts and high molecular weight cationic polymer coating agents, it has poor compatibility with traditional anionic treatment agents and has high biological toxicity, so its application is limited

Method used

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  • Water-based drilling fluid with high suppression and lubrication performance and preparation method thereof
  • Water-based drilling fluid with high suppression and lubrication performance and preparation method thereof
  • Water-based drilling fluid with high suppression and lubrication performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] To prepare water-based drilling fluid without heavy suppression and high lubrication: add 400mL seawater to the high-speed mixing cup, turn on the mixer, add 20g sodium chloride, 1.2g polyacrylamide (PAM), and 12g amines while stirring at 3000r / min Strong inhibitor (PCHA), 1.2g xanthan gum (XC), 4g low viscosity polyanionic cellulose (PAC-L), 8g water-based lubricant (SD-506) and 12g ultrafine calcium carbonate. Each treatment agent was added at intervals of 10 minutes, and stirred for 30 minutes after all were added.

[0035] The above-mentioned strong amine inhibitor (PCHA) is a product obtained by mixing cycloalkylamine and hydrochloric acid according to a molar ratio of 1:1.

Embodiment 2

[0037] The preparation density is 1.3g / cm 3 For strong suppression and high lubricating water-based drilling fluid, add 400mL of fresh water into the high-speed mixing cup, turn on the mixer, add 40g of potassium chloride, 1.2g of cationic polyacrylamide (CPAM), and 12g of amines for strong suppression while stirring at 3000r / min Agent (PMCHA), 1.2g xanthan gum (XC), 4g low viscosity carboxymethyl cellulose (CMC-L), 8g extreme pressure lubricant (SD-505), 12g ultrafine calcium carbonate and 170g barite. Each treatment agent was added at intervals of 10 minutes, and stirred for 30 minutes after all were added.

[0038] The aforementioned strong inhibitor of amines (PMCHA) is a product obtained by mixing N-methylcyclohexylamine and formic acid in a molar ratio of 1:1.

Embodiment 3

[0040] Preparation of non-intensive strong suppression, high-lubrication water-based drilling fluid: add 400mL seawater into the high-speed mixing cup, turn on the mixer, add 9g sodium chloride and 20g potassium chloride, 1.2g zwitterionic polymer while stirring at 3000r / min FA367), 1.2g strong amine inhibitor (PDMCHA), 1.2g xanthan gum (XC), 4g hydroxyethyl cellulose (HEC), 8g nanoemulsion, 12g ultrafine calcium carbonate. Each treatment agent was added at intervals of 10 minutes, and stirred for 30 minutes after all were added.

[0041] The aforementioned strong inhibitor of amines (PDMCHA) is a product obtained by mixing N,N-dimethylcyclohexylamine and citric acid according to a molar ratio of 1:1.

[0042] Effects in the examples will be described below.

[0043] First, in order to evaluate the inhibitory performance of the strong amine inhibitors as shale inhibitors, the performance of the strong amine inhibitors was compared with the traditional inorganic salt inhibitor...

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Abstract

The invention relates to a water-based drilling fluid with high suppression and lubrication performance and a preparation method thereof. The water-based drilling fluid mainly comprises 100 parts of fresh or sea water, 2 to 10 parts of inorganic salt, 0.2 to 5 parts of amine strong suppressant which is a product of reaction of a naphthenic amine compound and a bronsted acid, 0.1 to 1 part of coating inhibitor, 0.1 to 1 part of tackifier, 0.1 to 1.5 parts of filtrate reducer, 0.5 to 5 parts of anti-mud-coating lubricating agent, 1 to 10 parts of temporary plugging agent and a proper amount of weighting agent (added according to requirements). The drilling fluid provided by the invention has high suppression performance and lubrication performance, can effectively protect an oil gas layer and is a novel drilling fluid system which can replace oil-based drilling fluid.

Description

technical field [0001] The invention relates to a drilling fluid for petroleum drilling. Background technique [0002] With the expansion of exploration fields and the advancement of drilling technology, conventional water-based drilling fluids cannot meet the requirements of drilling fluid inhibition and lubricity for directional wells, complex wells, and branch wells. Oil-based drilling fluid has always been an ideal choice for complex and difficult wells due to its excellent inhibitory properties, high temperature stability and excellent lubricating properties. However, its adverse impact on the environment and high cost limit its widespread use. For this reason, developing a water-based drilling fluid with excellent properties of oil-based drilling fluid has become a common goal of drilling fluid workers. In recent years, a series of strongly inhibited water-based drilling fluid systems have been developed, such as KCl / polymer drilling fluid, positive gel drilling flui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/22
Inventor 钟汉毅邱正松黄维安江琳曹杰张现斌张世锋王富伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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