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Strongly inhibiting cationic polymer drilling fluid

A cationic polymer and drilling fluid technology, which is applied in the field of oil drilling and drilling fluid, can solve the problems of weakening inhibition performance, achieve the effects of reducing expansion and dispersion, inhibiting well wall collapse, and weakening the hydration effect

Inactive Publication Date: 2018-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the usual practice is to add one or two cationic substances to the existing anionic drilling fluid system, but when other properties in the drilling fluid are controlled by anionic treatment agents, the cationic groups in the system have been offset. Few, its inhibitory performance is also greatly weakened

Method used

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  • Strongly inhibiting cationic polymer drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: 3% bentonite + 0.6% polyamine + 0.2% cationic polyacrylamide (cationic degree 3.5%, number average molecular weight 500,000, cationic monomer is DMC) + 0.5% cationic starch + 5% cationic glycoside + 0.2% Xanthan gum+15%BaSO 4 .

Embodiment 2

[0020] Example 2: 1.5% bentonite + 2% polyamine + 0.3% cationic polyacrylamide (cationic degree 5%, number average molecular weight 350,000, cation is C 18 DMAAC) + 0.5% cationic starch + 2% triethanolamine oleate + 0.2% xanthan gum + 2% methyl oleate + 0.02% defoamer + 11% BaSO 4 .

Embodiment 3

[0021] Example 3: 3% bentonite + 0.5% polyamine + 0.2% cationic polyacrylamide (cationic degree 6%, number average molecular weight 800,000, cation is DMAEME) + 0.3% cationic starch + 1.0% low viscosity-polyanionic cellulose +3% Diethanolamine Oleate+0.3%Xanthan Gum+1%Methyl Oleate+0.05%Defoamer+20%BaSO 4 ;

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Abstract

The invention relates to a strongly inhibiting cationic polymer drilling fluid system. The system mainly contains four characteristic treatment agents such as a cationic polymer coating agent, a cationic polymer inhibitor, a fluid loss control agent and a lubricant. The system also comprises conventional additives such as clay, a weighting agent, a defoamer, a pH regulator and a plugging agent. The drilling fluid system has strong inhibition effects, good rheological properties, lubricity and high temperature resistance and can be used for the drilling operation of a horizontal section of a shale gas horizontal well.

Description

technical field [0001] The invention relates to a cationic polymer water-based drilling fluid system with strong inhibitory properties, which is mainly used in the preparation and preparation of drilling fluids in current oil drilling, and belongs to the technical field of oil drilling drilling fluids. Background technique [0002] Wellbore stability has always been a technical problem in drilling in water-sensitive formations with high shale content. Especially in the drilling of horizontal wells and extended reach wells, the borehole wall problem is particularly prominent. The drilling fluid performance requirements for horizontal wells and extended reach wells are: strong suppression and low friction. [0003] At present, the water-based drilling fluid systems commonly used at home and abroad are almost all anionic treatment agents. These treatment agents themselves have strong anionic groups, and most of them disperse clay in water to form a negatively charged dispersion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12C09K2208/34
Inventor 庞雨微袁俊秀逯贵广徐冬梅
Owner CHINA PETROLEUM & CHEM CORP
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