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Water-based drilling fluid applicable to horizontal shale and preparation method thereof

A water-based drilling fluid and mud shale technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in low cost, backward supporting technologies, and water-based drilling fluids that cannot meet the needs of drilling. , to reduce friction, improve inhibition performance, and enhance the ability to carry cuttings

Inactive Publication Date: 2014-07-23
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of drill bit uses special chemical compounds called plugs or antisettling agents instead of regular coatings on its surface when it works well at different types of rock layers such as sandstone strata. These plugged materials help prevent cracks from forming while still allowing liquor circulation through them during drilling operations. Additionally, they also make sure there will always have enough liquid to transport cutted material away without getting stuck up again. Overall, this technology improves efficiency and reduces damage caused by drills compared to traditional methods like lining pores together.

Problems solved by technology

The technical problem addressed by this patented method relates to improving the efficiency at which crude oils or natural gases flow through underground rock layers without causing damage due to imperfections like cracks caused when drilling horizontally along these paths.

Method used

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  • Water-based drilling fluid applicable to horizontal shale and preparation method thereof
  • Water-based drilling fluid applicable to horizontal shale and preparation method thereof
  • Water-based drilling fluid applicable to horizontal shale and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare water-based drilling fluid suitable for horizontal shale formations without adding weight: add 400g fresh water to a high mixing cup, turn on the mixer, and add 8g sodium bentonite, 0.16g sodium carbonate, 0.8g XC-60 while stirring at 10000r / min ( Shengda Cellulose Factory, Dongying City, Shandong Province), 2g organic amine (produced by Shengli Oilfield Shengli Chemical Co., Ltd.), 12g sulfomethyl phenolic resin (SMP-I), 2g small molecule coating agent, 8g modified asphalt (Beijing Hongqin Petroleum Additive Co., Ltd. produces HQ-1), 4g aluminum-based polymer, 12g calcium carbonate, 12g vegetable oil lubricant, 2g sorbitan monooleate.

Embodiment 2

[0032] Prepare water-based drilling fluid suitable for horizontal shale formations without adding weight: add 400g of fresh water to a high mixing cup, turn on the mixer, add 12g of sodium bentonite, 0.16g of sodium carbonate, 1.2g of XC-60 ( Products produced by Shengda Cellulose Factory in Dongying City, Shandong Province), 2g organic amines (products produced by Shengli Oilfield Shengli Chemical Co., Ltd.), 8g sulfomethyl phenolic resin (SMP-I), 8g hyperbranched phenolic resin (SPC ), 6g small molecule coating agent, 12g sulfonated pitch (produced by Shengli Oilfield Shengli Chemical Co., Ltd.), 4g aluminum-based polymer, 12g calcium carbonate, 18g vegetable oil lubricant, 2g sorbitan monooleate.

Embodiment 3

[0034] Prepare water-based drilling fluid suitable for horizontal shale formations without adding weight: add 400g of fresh water to a high mixing cup, turn on the mixer, add 24g of sodium bentonite, 1.2g of sodium carbonate, 4g of XC-60 (Shandong Dongying Shengda Cellulose Factory), 8g organic amine (produced by Shengli Oilfield Shengli Chemical Co., Ltd.), 32g hyperbranched phenolic resin (SPC), 8g small molecule coating agent, 20g sulfonated pitch, 8g aluminum-based polymer material, 24g calcium carbonate, 24 glass pellets, 4g sorbitan monooleate.

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Abstract

The invention relates to water-based drilling fluid applicable to horizontal shale and a preparation method thereof. The drilling fluid consists of the following components in parts by weight: 1000 parts of water, 20-60 parts of bentonite for drilling fluid, 0.4-3 parts of sodium carbonate, 2-10 parts of tackifier, 5-20 parts of shale inhibitor, 30-80 parts of filtrate reducer, 5-20 parts of small molecular coating agent, 20-50 parts of asphalt blocking anti-collapse agent, 10-20 parts of aluminum-base polymer, 30-60 parts of rigid blocking anti-collapse agent, 30-60 parts of lubricant, 5-10 parts of emulsifying agent and 100-1200 parts of weighting agent. The drilling fluid disclosed by the invention, for characteristics of a horizontal shale stratum, is excellent in inhibiting property, blocking performance and lubricating property, and is capable of effectively blocking micro-cracks and inhibiting clay hydration and swelling; even though little filtrate enters into the shale stratum along with drilling, the drilling fluid can delay hydration and swelling of the shale due to a relatively strong inhibiting property; meanwhile, due to excellent lubricating property, the drilling fluid can meet a demand of horizontal drilling.

Description

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Claims

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Application Information

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Owner CHINA PETROCHEMICAL CORP
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