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High water phase oil-based drilling fluid applicable to long horizontal section of shale gas and preparation method of high water phase oil-based drilling fluid

An oil-based drilling fluid and horizontal section technology, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the instability of shale wellbore in long horizontal sections, the rising cost of oil-based drilling fluid, and the loss of oil-based drilling fluid. and other problems, to achieve the effect of shale wellbore stability, strong shale stability, and reduction of oil phase content

Inactive Publication Date: 2017-05-10
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current oil-based drilling fluid system, the ratio of oil to water is relatively high, generally above 80:20, which greatly increases the cost of oil-based drilling fluid; after increasing the content of the water phase, limited by the type of emulsifier, there are poor fluidity, loss of The problems of high water rate, low electrical stability, and instability of shale wellbore in long horizontal section, and the leakage of oil-based drilling fluid have always plagued drilling production. It is urgent to develop a set of high-water-phase oil-based drilling fluid suitable for long horizontal section shale To solve the above problems, so as to achieve the purpose of developing shale gas with environmental protection, high efficiency and low cost

Method used

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  • High water phase oil-based drilling fluid applicable to long horizontal section of shale gas and preparation method of high water phase oil-based drilling fluid
  • High water phase oil-based drilling fluid applicable to long horizontal section of shale gas and preparation method of high water phase oil-based drilling fluid
  • High water phase oil-based drilling fluid applicable to long horizontal section of shale gas and preparation method of high water phase oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present invention provides a high water-phase oil-based drilling fluid suitable for long horizontal sections of shale gas and a preparation method thereof:

[0025] Measure 200mL of No.0 diesel oil, add 12g of alkyl primary amine under high-speed stirring (10000r / min), stir for 20min, then add 200mL of clear water, stir for 40min; then add 8g of asphalt emulsion, stir for 20min; then add 4g of organic Add 12g of oxidized pitch and stir for 20min; then add 60g of calcium chloride and stir for 20min; then add 8g of lime and stir for 10min; finally add 320g of barite (density 1.50g / cm 3 ) and stirred for 20min to obtain the product.

[0026] The performance of the product in this example is shown in Table 1, and all parameters are measured at room temperature. Among them, the pre-rolling state is to measure the performance after preparation, and the post-rolling state is to heat the prepared drilling fluid at 120 ° C. 16h, then cooled to room temperature to measure pe...

Embodiment 2

[0035] The present invention provides a high water-phase oil-based drilling fluid suitable for long horizontal sections of shale gas and a preparation method thereof:

[0036] Measure 200mL of No.0 diesel oil, add 6g of alkanolamide and 6g of polyester amide under high-speed stirring (10000r / min), stir for 20min, then add 200mL of clear water, stir for 40min; then add 10g of nanopolymer, stir for 20min; Then add the mixture of phosphoric acid ester of 6g and aluminum chloride, stir 20min; Add 16g superfine asphalt powder again, stir 20min; Then add 60g sodium formate, stir 20min; Add 8g lime again, stir 10min; Finally add 320g barite ( Density 1.50g / cm 3 ) and stirred for 20min to obtain the product.

[0037] The performance of the product of this embodiment is as shown in Table 2, and the meaning of each parameter and the test method are the same as in Example 1.

[0038] Table 2 embodiment 2 product performance experiment data

[0039]

[0040]

[0041] Note: Hot ro...

Embodiment 3

[0043] The present invention provides a high water-phase oil-based drilling fluid suitable for long horizontal sections of shale gas and a preparation method thereof:

[0044] Measure 200mL No. 0 diesel oil, under high-speed stirring (10000r / min), add 6g carboxylic acid polyamide and 6g polyamide fatty acid soap, stir for 20min, then add 200mL clear water, stir for 40min; then add 4g nano-graphite, 4g Superfine calcium carbonate, 4g superfine calcined kaolin, stir for 20min; then add 6g of coumarone resin, stir for 20min; then add 16g of oxidized pitch, stir for 20min; then add 60g of potassium formate, stir for 20min; add 8g of lime, stir for 10min ; Finally add 320g barite (density 1.50g / cm 3 ) and stirred for 20min to obtain the product.

[0045] The product performance of this embodiment is as shown in Table 3, and the meaning of each parameter and test method are identical with embodiment 1.

[0046]Table 3 embodiment 3 product performance experiment data

[0047]

...

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Abstract

The invention provides a high water phase oil-based drilling fluid applicable to a long horizontal section of shale gas and a preparation method of the high water phase oil-based drilling fluid. The drilling fluid is prepared from oil, water, a high-efficiency emulsifier, a nanometer plugging agent, a tackifying and shear strength improving agent, a filtrate reducer, an activity control agent, an alkalinity regulator and a weighting agent, wherein a volume ratio of oil to clear water is 40:60-70:30, 3-5 g of the high-efficiency emulsifier, 2-4 g of the nanometer plugging agent, 1-3 g of the tackifying and shear strength improving agent, 3-5 g of the filtrate reducer, 15-20 g of the activity control agent, 2-5 g of the alkalinity regulator and 20-200 g of the weighting agent are added to every 100 mL of an oil and clear water mixed solution. A product of the drilling fluid has the characteristics of low oil-water ratio, high inhibition property, low shear rate, high viscosity, high electrical stability, high sealing property, good lubricity, low filtration loss, simple formula composition, and has the advantages of being environment-friendly, efficient, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of chemical product manufacturing, in particular to a high water-phase oil-based drilling fluid suitable for long horizontal sections of shale gas and a preparation method thereof. Background technique [0002] With the promulgation of relevant new environmental protection laws and regulations such as the Environmental Protection Law, more attention has been paid to environmental protection and ecological construction, the requirements for the prevention and control of environmental pollution have become increasingly stringent, and the corresponding punishment measures have also become more stringent. In the process of shale gas exploitation, conventional water-based drilling fluids cannot solve the problems of wellbore stability and lubrication friction in long horizontal sections, and the cost of oil-based drilling fluids can only be reduced by increasing the water phase content of oil-based drilling fluids...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14C09K8/467C09K8/487C09K8/48
CPCC09K8/14C09K8/467C09K8/48C09K8/487C09K2208/10
Inventor 梁文利游云武宋金初陈智源彭小平刘静刘俊君梅露强
Owner 中石化石油工程技术服务有限公司
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