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High-performance water-based drilling fluid suitable for long horizontal section of shale gas, and preparation method thereof

A technology of water-based drilling fluid and horizontal sections, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems of stability and lubricity of the borehole wall of extended-reach horizontal wells, and difficulties in guaranteeing the quality of oil sludge and cement cement , insufficient environmental performance of oil-based drilling fluids, etc., to achieve the effects of improving wellbore stability, improving drilling efficiency, and reducing water intrusion

Inactive Publication Date: 2018-02-02
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increasingly strengthened environmental protection laws and regulations, as well as high leakage risks in newly developed areas have brought huge environmental protection and cost pressures to the overall development plan of subsequent shale gas blocks
[0005] The disadvantages of oil-based drilling fluid, such as insufficient environmental performance, high cost, and complicated process, are more prominent in this context, and it is difficult to cement shallow gas wells under the condition of oil-based drilling fluid. Using oil-based drilling fluid to drill wells, two There is oil sludge at the interface, and the quality of cement bonding is difficult to guarantee
At the same time, the conventional ordinary water-based drilling fluid system cannot solve the technical needs of wellbore stability and lubricity required for extended-reach horizontal well drilling during the drilling process

Method used

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  • High-performance water-based drilling fluid suitable for long horizontal section of shale gas, and preparation method thereof
  • High-performance water-based drilling fluid suitable for long horizontal section of shale gas, and preparation method thereof
  • High-performance water-based drilling fluid suitable for long horizontal section of shale gas, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The invention provides a high-performance water-based drilling fluid suitable for a long horizontal section of shale gas and a preparation method thereof:

[0037] Measure 300ml of produced water, add 2.1g of loose bentonite powder under high-speed stirring (10000r / min), stir for 20min, then add 2.1g of caustic soda, stir for 20min; then add 3.0g of nano silica, 1.5g of nano Graphite, stir for 20min; then add 2.1g low-viscosity polyanionic cellulose, stir for 20min; add 0.3g cationic polyacrylamide, stir for 20min; then add 6g sulfonated asphalt potassium salt, stir for 20min; add 3g oxidized asphalt, 3g Sulfomethyl brown coal resin, stir for 10min; 9g aminosilanol, stir for 10min; 9g styrene-acrylic latex, stir for 10min; 9g polyether polyol, stir for 10min, and finally add 560g barite (density 1.50g / cm 3 ) Stir for 20 minutes to obtain the product.

[0038] The performance of the product in this example is shown in Table 1. The parameters are measured at room temperature. ...

Embodiment 2

[0049] The invention provides a high-performance water-based drilling fluid suitable for a long horizontal section of shale gas and a preparation method thereof:

[0050] Measure 300ml of produced water, add 2.1g of loose bentonite powder under high-speed stirring (10000r / min), stir for 20min, then add 2.1g of caustic soda, stir for 20min; then add 3.0g sodium methyl silicate, 1.5g Nano graphite, stir for 20min; then add 2.1g carboxymethyl starch, stir for 20min; then add 0.3g anionic polyacrylamide, stir for 20min; then add 6g rubber latex modified emulsified asphalt, stir for 20min; then add 3g graphene oxide, 3g sulfomethyl phenolic resin, stirred for 10min; 9g amino-terminated polyether, stirred for 10min; 9g styrene latex, stirred for 10min; 9g polycaprolactone polyol, stirred for 10min, and finally added 560g barite (density 1.50g / cm 3 ) Stir for 20 minutes to obtain the product.

[0051] The performance of the product in this example is shown in Table 2, and the meaning of...

Embodiment 3

[0056] The invention provides a high-performance water-based drilling fluid suitable for a long horizontal section of shale gas and a preparation method thereof:

[0057] Measure 300ml of produced water, add 2.1g of loose bentonite powder under high-speed stirring (10000r / min), stir for 20min, then add 2.1g of caustic soda, stir for 20min; then add 3.0g sodium methyl silicate, 1.5g Nano graphite, stir for 20min; then add 2.1g of low-viscosity carboxymethylcellulose sodium salt and stir for 20min; add 0.3g of non-ionic polyacrylamide and stir for 20min; then add 6g of polystyrene modified asphalt and stir for 20min; Add 3g sulfomethyl brown coal resin, 3g sulfomethyl phenolic resin and stir for 10min; 9g polyethylene glycol, stir for 10min; 9g nitrile latex, stir for 10min; 9g alkyl glycoside, stir for 10min, and finally add 560g barite ( Density 1.50g / cm 3 ) Stir for 20 minutes to obtain the product.

[0058] The performance of the product in this embodiment is shown in Table 3, a...

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Abstract

The invention provides a high-performance water-based drilling fluid suitable for the long horizontal section of shale gas and a preparation method thereof. agent, anti-slump lubricant, plugging fluid loss reducer, inhibitor, nano plugging agent and speed-increasing lubricant. 1.0g, multifunctional composite agent 1.5-2g, medium molecular weight fluid loss reducer 0.7g-1.5g, high-efficiency coating agent 0.1g-0.3g, anti-slump lubricant 2g-4g, plugging fluid loss reducer 1g-2g , inhibitor 2g-4g, nano-blocking agent 2g-4g, speed-up lubricant 2g-4g, barite 30g-200g. The drilling fluid product of the present invention has shale well wall stability in long horizontal sections, high viscosity at low shear rates, strong sand-carrying ability, strong ability to plug micro-cracks, good lubricity, low filtration loss, low cost, and on-site preparation and maintenance Simple and efficient, low biological toxicity, water-based cuttings can be directly discharged and other characteristics.

Description

Technical field [0001] The invention relates to the technical field of chemical product manufacturing, in particular to a high-performance water-based drilling fluid suitable for a long horizontal section of shale gas and a preparation method thereof. Background technique [0002] With the implementation of the new Environmental Protection Law, the requirements for the environmental impact of oil-based drill cuttings have become stricter. Oil-bearing cuttings are included in the list of hazardous wastes according to the "National Directory of Hazardous Wastes", and their management and disposal shall be implemented in accordance with relevant regulations on hazardous wastes. [0003] Obviously, regardless of environmental risks or cost deficiencies, oil-based drilling fluids are destined to become an "unbearable weight" for the sustainable development of shale gas. To achieve the sustainable development of shale gas, water-based drilling fluids must be overcome. [0004] For the Sin...

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/16
CPCC09K8/24C09K8/16C09K2208/10C09K2208/12C09K2208/34
Inventor 梁文利宋金初彭小平陈智源刘俊君梅露强
Owner SINOPEC SSC
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