Novel drilling fluid for exploring oil shale

A drilling fluid and oil shale technology, applied in the field of new drilling fluids for oil shale exploration, can solve the problems of low drilling efficiency and low core extraction rate, and achieve the effects of improving the core extraction rate and preventing the collapse of the hole wall.

Inactive Publication Date: 2015-01-21
CHANGCHUN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As oil shale resources are paid attention to, the pace of its exploitation is also accelerating. Traditional drilling fluids cannot meet the requirements of oil shale formations well, and there are problems such as low core recovery rate and low drilling efficiency. Therefore, a new type of oil shale is developed. Rock exploration drilling fluid is very necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Sodium bentonite, sodium carbonate (Na 2 CO 3 ), low viscosity sodium carboxymethylcellulose (Na-CMC), hydrolyzed polyacrylamide (PHP), sulfonated pitch. First add the calculated water into the mixing tank, then add sodium bentonite and sodium carbonate and stir for 30-40 minutes; add pre-dissolved low-viscosity carboxymethyl cellulose sodium and stir for 15 minutes; add pre-dissolved hydrolyzed polyacrylamide Stir for 15 minutes; add sulfonated asphalt and stir for 15 minutes. According to the percentage of solid mass and liquid volume, the formula is: water + sodium bentonite 4.0% + sodium carbonate 0.04% + Na-CMC 0.9% + PHP 0.06% + sulfonated asphalt 1.0%; among them, sodium bentonite has hygroscopicity and can absorb 8 ~15 times the volume of water, after absorbing water, it can expand up to more than 30 times, and can be dispersed in the water medium to form a colloidal suspension. This suspension has certain viscosity and thixotropy, and is a good pulp maker. M...

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PUM

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Abstract

The invention relates to a novel drilling fluid for exploring oil shale. The novel drilling fluid for exploring the oil shale is characterized by being prepared from the following components according to a ratio of solid mass to liquid volume in percent: 4.0% of sodium bentonite, 0.04% of sodium carbonate, 0.9% of low-viscosity sodium carboxymethylcellulose, 0.06% of hydrolyzed polyacrylamide, 1.0% of sulfonated bitumen and the balance of water. The novel drilling fluid for exploring the oil shale has strong protecting wall anti-sloughing property and good flowing deformation property, has functions of blocking small cracks and preventing sticking and has the characteristics that preparation is simple, operation is easy and cost is low.

Description

technical field [0001] The invention relates to a new type of drilling fluid for oil shale exploration, which belongs to a method for punching holes and retaining walls in drilling engineering of geological exploration. Background technique [0002] At present, most of the oil shale distribution areas in the world have a low degree of geological exploration, and it is difficult to correctly predict the global oil shale resources (the predicted shale oil resources are 411 billion tons). Only some countries have carried out oil shale deposits in their countries Detailed exploration and appraisal work. As an unconventional oil and gas resource, oil shale is second only to coal in reserves. Its pyrolysis can produce shale oil similar to crude oil and gas that can replace natural gas, which can supplement conventional energy and has very important strategic significance for changing my country's energy structure. ! [0003] Oil shale is a kind of saprolite, which is prone to hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/02C09K2208/28C09K2208/34
Inventor 吴景华谢俊革谢俊来李长雨高成梁郎秋玲杜兆成王伟刘秧彭第黄非刘莉莎黄静莉
Owner CHANGCHUN INST OF TECH
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