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Water-based drilling fluid composition and water-based drilling fluid

A technology for water-based drilling fluid and composition, applied in the field of water-based drilling fluid composition and water-based drilling fluid, can solve problems such as wellbore instability, achieve the effects of increasing drilling speed, excellent performance, and promoting wellbore stability

Pending Publication Date: 2022-08-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a water-based drilling fluid composition and water-based drilling fluid to solve the problem of wellbore instability existing in the drilling process of shale formations in the prior art

Method used

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  • Water-based drilling fluid composition and water-based drilling fluid
  • Water-based drilling fluid composition and water-based drilling fluid

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Effect test

preparation example Construction

[0025] The preparation of the above-mentioned nano-silica blocking agent can refer to the technology of silane coupling agent and polymerized monomer in the prior art to modify the surface of inorganic nanoparticles, in order to reduce the cost of nano-silica blocking agent, and Make the obtained nano-silica plugging agent more suitable for the water-based drilling fluid of the present application, preferably adopt the following preparation method to obtain the nano-silica plugging agent:

[0026] (1) put 4-10 parts by weight of nano-silicon dioxide powder in a 100°C vacuum drying oven to dry to constant weight, and dry the dried nano-silicon dioxide powder and 3-6 parts by weight of silane coupling agent It is sequentially added to 80-120 parts by weight of absolute ethanol, and the mixture is dispersed in a supersonic emulsification disperser for 1-1.5 hours.

[0027] (2) Transfer the mixed solution prepared in step (1) into a three-necked flask, continue to flow nitrogen at...

Embodiment 1

[0046] Preparation of nano-silica plugging agent:

[0047] (1) put 4 parts by weight of nano-silicon dioxide powder (20nm) in a 100°C vacuum drying oven and dry to constant weight, and dry the nano-silica powder after drying and 10 parts by weight of vinyl tri(β) -Methoxyethoxy)silane was sequentially added to 80 parts by weight of absolute ethanol, and the mixture was dispersed in a ultrasonic emulsification disperser for 1.5h.

[0048] (2) The mixed solution prepared in step (1) was transferred into a three-necked flask, and nitrogen was continuously passed through at 70° C. for 10 hours, and the reaction product was purified and dried with acetone.

[0049] (3) in 100 parts by weight of deionized water, successively add the isopropanol of 1 weight part, the methyl methacrylate of 2 weight parts, the obtained emulsifier solution is stirred for 8 minutes at light speed, and the emulsion is transferred to four in the flask.

[0050] (4) The reaction product dried in step (2)...

Embodiment 2

[0060] The difference between Example 2 and Example 1 is that the particle size of the nano-silica powder is 10 nm, and a water-based drilling fluid is finally obtained.

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Abstract

The invention provides a water-based drilling fluid composition and a water-based drilling fluid. The water-based drilling fluid composition comprises the following components in parts by weight: 100 parts of water, 4-10 parts of a filtrate reducer, 2-7 parts of a cationic polyacrylamide polymer inhibitor and 2-9 parts of a nano silicon dioxide blocking agent. On one hand, positive charges carried by the electropositive drilling fluid system containing the cationic polyacrylamide polymer inhibitor can reduce negative potentials of clay minerals and drilling cuttings, and well wall stability is promoted. And on the other hand, the nano-sized silicon dioxide blocking agent can reduce filtrate invasion and pressure transfer effect, so that the water-based drilling fluid can effectively solve the problem of borehole wall instability in the shale formation drilling process based on the two effects. Meanwhile, the electropositive drilling fluid system containing the cationic polyacrylamide polymer inhibitor can inhibit dispersion of drilling cuttings, so that the drilling speed is increased, and the raw materials are wide in source and low in cost.

Description

technical field [0001] The present invention relates to the technical field of water-based drilling fluids, in particular to a water-based drilling fluid composition and water-based drilling fluids. Background technique [0002] Shale gas is characterized by large reserves, long production cycle, well-developed micro-fractures and matrix nano-pores in most shale formations, strong water sensitivity, obvious bedding distribution, and rich organic matter such as kerogen. In the process of drilling shale formations, a series of problems such as falling off blocks and oil well collapse are prone to occur, that is, the difficulty of drilling shale formations is the problem of wellbore instability when drilling, especially when drilling horizontal wells. Borehole instability will slow down the drilling speed and prolong the drilling cycle, which will lead to increased drilling costs, complicated downhole accidents, and even the failure of drilling operations and the scrapping of t...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/035C09K8/24C09K8/504C09K8/508C09K8/42
CPCC09K8/03C09K8/032C09K8/035C09K8/24C09K8/5045C09K8/5083C09K8/426C09K2208/12C09K2208/34
Inventor 霍进滕卫卫叶成徐生江路宗羽赵廷峰
Owner PETROCHINA CO LTD
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