Drilling fluid for shale hydrocarbon reservoir exploration

A technology for shale oil and gas and drilling fluid, applied in the field of drilling fluid, can solve the problems of no improvement in system lubricity, easy development of micro-cracks, poor plugging performance, etc., achieve good lubricity, increase impermeability, improve prevention The effect of the corrosion effect

Inactive Publication Date: 2015-05-13
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages or deficiencies of these technologies are: ① Micro-fractures are easy to develop in shale oil and gas reservoir formations, and wellbore collapses are likely to occur after water intrusion
The above-mentioned technologies have not carried out research work on wellbore stability in the exploration and development of shale oil and gas reservoirs, and the plugging performance is not strong; The problem of not being able to provide excellent lubricity for a long time was studied, and the lubricity of the system did not improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of drilling fluid used for the exploration and development of shale oil and gas reservoirs, on the basis of water, the weight percentage of different additives is added: 4% bentonite, 2% potassium silicate, 0.2% polyacrylamide, 0.1% polyanionic cellulose and 0.1% % xanthan gum, 2% humic acid fluid loss reducer and 2% sulfonated phenolic resin, 2% sulfonated pitch, 2% 20nm silicon dioxide, 0.5% hydrophobic starch, zinc dialkyldithiophosphate 2%, caustic soda 0.4%. After the preparation is completed, the measured performance is: density 1.06g / cm 3 , viscosity 42s, API fluid loss 2.8ml, pH value 10.

Embodiment 2

[0024] A kind of drilling fluid for the exploration and development of shale oil and gas reservoirs, the percentage by weight of adding different additives on the basis of water is: 6% of bentonite, 5% of potassium silicate, 0.5% of polyacrylamide, 1% of polyanionic cellulose and 0.5% xanthan gum, 3% humic acid fluid loss reducer, 3% sulfonated phenolic resin, 3% sulfonated pitch, 3% 100nm silicon dioxide, 1% hydrophobic starch, dialkyl dithiophosphoric acid Zinc 4%, caustic soda 0.6%. After the preparation is completed, the measured performance is: density 1.06g / cm 3 , viscosity 47s, API fluid loss 2.0ml, pH value 11.

Embodiment 3

[0026] A kind of drilling fluid used for the exploration and development of shale oil and gas reservoirs, the percentage by weight of adding different additives on the basis of water is: 5% bentonite, 3% potassium silicate, 0.3% polyacrylamide, 0.5% polyanionic cellulose and 0.2% xanthan gum, 3% humic acid fluid loss reducer, 2% sulfonated phenolic resin, 2% sulfonated pitch, 2.5% 20nm silicon dioxide, 0.5% hydrophobic starch, dialkyl dithiophosphoric acid Zinc 3%, caustic soda 0.5%. After the preparation is completed, the measured performance is: density 1.06g / cm 3 , viscosity 44s, API fluid loss 2.6ml, pH value 10.5.

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Abstract

The invention provides a drilling fluid for shale hydrocarbon reservoir exploration. The drilling fluid is based on water, and comprises 4-6wt% of bentonite, 2-5wt% of potassium silicate, 0.2-0.5wt% of a coating inhibitor, 0.2-1.5wt% of a flow pattern regulator, 4-6wt% of a fluid loss additive, 2-3wt% of a shale caving inhibitor, 2-3wt% of a plugging agent, 0.5-1wt% of a filter cake surface modifier, 2-4wt% of a lubricant and 0.4-0.6wt% of a pH value regulator. The drilling fluid has the characteristics of good plugging property, strong inhibition, good lubricity and stable high temperature performances to shale hydrocarbon reservoir stratums, and is suitable for the exploration of shale hydrocarbon reservoirs.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a drilling fluid used in the exploration and development of shale oil and gas reservoirs. Background technique [0002] The exploration and development of shale gas in foreign countries, especially the United States, has formed a commercial scale. The United States is at the forefront of shale gas development in the world and has entered a stage of rapid development of shale gas development. Drilling fluid systems commonly used abroad are mainly oil-based drilling fluids, strongly inhibited amine-based drilling fluids, organic or inorganic salt drilling fluids, etc. Although there are differences between shale formations in different regions, oil-based drilling fluids have wide applicability and can be applied to the development of most shale oil and gas reservoirs. It has many advantages, such as: excellent shale stability, lubricity and anti-pollution ability, but the environmental and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/22
CPCC09K8/16C09K8/206C09K8/22C09K2208/34
Inventor 刘振东乔军李公让周守菊成冠琪
Owner CHINA PETROCHEMICAL CORP
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