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High-performance water-based polymer drilling fluid system

A water-based polymer, high-performance technology, applied in the field of oil drilling drilling fluids, can solve problems such as weakening of inhibition performance, and achieve the effects of reducing swelling and dispersion, strengthening wellbore collapse, and inhibiting wellbore collapse

Inactive Publication Date: 2018-05-11
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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  • High-performance water-based polymer drilling fluid system

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 3% bentonite + 0.6% NH-1 + 0.2% cationic polyacrylamide (cationic degree 3.5%, number average molecular weight 500,000, cation is DA) + 0.5% polyanionic cellulose + 5% cationic glycoside + 0.2 %Xanthan Gum+15%BaSO 4 .

Embodiment 2

[0019] Example 2: 1.5% bentonite + 0.5% polyamine inhibitor + 0.3% cationic polyacrylamide (cationic degree 5%, number average molecular weight 350,000, cation is DMDAAC) + 1.5% sodium carboxymethylcellulose + 4% NH -EPJ extreme pressure lubricant + 0.2% xanthan gum + 0.02% defoamer + 11% BaSO 4 .

Embodiment 3

[0020] Example 3: 3% bentonite + 0.8% NH-1 + 0.2% cationic polyacrylamide (cationic degree 6%, number average molecular weight 800,000, cation is DAC) + 1.0% polyanionic cellulose + 5% methyl glucoside + 0.3% xanthan gum + 0.05% defoamer + 0.3% fungicide + 20% BaSO 4 .

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Abstract

The invention relates to a high-performance water-based polymer drilling fluid system. The high-performance water-based polymer drilling fluid system is mainly applied to the petroleum drilling industry and strong inhibition of a cationic polymer drilling fluid system. The high-performance water-based polymer drilling fluid system mainly contains a cationic polymer coating agent, a cationic polymer inhibitor, a fluid loss additive and a lubricant, and also contains other assistants forming the water-based drilling fluid system, such as bentonite, a tackifier, a weighting agent, a defoamer, a pH regulator and a plugging agent, and the balance of water. The drilling fluid system prepared in the invention has the advantages of strong inhibition property, good rheological performances, good lubricity and good resistance to the high temperature, and can be used for drilling the horizontal segment 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 are negatively charged dispersion systems formed by dispersing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C09K8/508
CPCC09K8/035C09K8/24C09K8/5083C09K8/5086C09K8/882C09K8/885C09K2208/12
Inventor 袁俊秀庞雨微逯贵广靳志超
Owner CHINA PETROLEUM & CHEM CORP
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