Synergist for water-based drilling fluid and preparation method thereof, water-based drilling fluid and application

A technology of water-based drilling fluid and synergist, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc. It can solve reservoir damage, wellbore instability, difficulty in drilling effective oil and gas layers, etc. problem, to achieve the effect of reducing pressure and free energy

Active Publication Date: 2022-04-29
BEIJING SHIDABOCHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when drilling mud shale formations during drilling, mud shale is easy to hydrate and swell and disperse when encountering traditional drilling fluids, making it difficult to drill effective oil and gas layers, resulting in problems such as wellbore instability and reservoir damage

Method used

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  • Synergist for water-based drilling fluid and preparation method thereof, water-based drilling fluid and application
  • Synergist for water-based drilling fluid and preparation method thereof, water-based drilling fluid and application
  • Synergist for water-based drilling fluid and preparation method thereof, water-based drilling fluid and application

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preparation example Construction

[0039] An embodiment of the present invention also proposes a method for preparing a synergist, including the following steps,

[0040] 1) Mix didodecyldimethylammonium bromide with distilled water and ethanol, heat up to 65-75°C, add nano-silica, n-octyltriethoxysilane, and paraffin, and react to obtain surface modification. sexual products;

[0041] 2) Cool down the above-mentioned surface modified product, add sodium styrene sulfonate, allyl trimethyl ammonium chloride, disodium lauryl sulfosuccinate, propyl triethoxysilane, and heat up to 50-75 ℃, react to get synergist.

[0042] The synergist that the embodiment of the present invention proposes, at first, utilizes dodecyl dimethyl ammonium bromide, paraffin, n-octyltriethoxysilane to carry out surface modification to nano-scale silicon dioxide, and then, with Sodium styrene sulfonate, allyl trimethyl ammonium chloride, disodium lauryl sulfosuccinate, and propyl triethoxysilane are polymerized to obtain an ester emulsio...

Embodiment 1

[0068] Example 1 A kind of preparation method of synergist for water-based drilling fluid

[0069] In the reaction kettle, add 30 parts of distilled water, 5 parts of ethanol, and 5 parts of didodecyldimethylammonium bromide, stir evenly, raise the temperature to 75°C, and add nano-SiO with a particle size of 100-500nm 2 15 parts, 10 parts of paraffin, 2 parts of n-octyltriethoxysilane, for SiO 2 Carry out surface modification for 2-3 hours, cool down to room temperature; add 20 parts of sodium styrene sulfonate, 10 parts of allyltrimethylammonium chloride, 1 part of disodium lauryl sulfosuccinate, propyl triethoxy 2 parts of base silane, stir evenly, raise the temperature to 50-75°C, and react for 8-16h to obtain the ester emulsion product.

Embodiment 2

[0070] Example 2 A kind of preparation method of synergist for water-based drilling fluid

[0071] Same as Example 1, except that there are 5 parts of n-octyltriethoxysilane and 5 parts of propyltriethoxysilane.

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Abstract

The present invention proposes a synergist for water-based drilling fluid and its preparation method, water-based drilling fluid and application, and belongs to the technical field of drilling fluid. The synergist is prepared from raw materials including the following parts by weight: sodium styrene sulfonate 15-25 parts, 8-15 parts of allyltrimethylammonium chloride, 2-8 parts of didodecyldimethylammonium bromide, 1-5 parts of n-octyltriethoxysilane, propyl 1-5 parts of triethoxysilane, 1-5 parts of disodium lauryl sulfosuccinate, 10-20 parts of nano silicon dioxide, 8-15 parts of paraffin, etc. The synergist can be used in the preparation of water-based drilling fluid and in the field of shale gas development. It can reduce the free energy of the rock surface, change the contact angle between the water phase or oil phase and the rock reservoir surface, and prevent the water phase or oil phase from entering the reservoir. , And, it can be used as inhibitor, lubricant and oil and gas layer protection agent at the same time. In addition, the synergist has a micro-nano structure, which can achieve full-scale plugging of micro-cracks of different sizes.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and in particular relates to a synergist for water-based drilling fluid and a preparation method thereof, water-based drilling fluid and application. Background technique [0002] With the increasing development of drilling technology, difficult wells such as ultra-deep wells and extended-reach wells have become the main research direction of oil and gas drilling. However, when drilling mud shale formations during drilling, mud shale is prone to hydration, swelling and dispersion when encountering traditional drilling fluids, making it difficult to drill effective oil and gas layers, resulting in problems such as wellbore instability and reservoir damage. [0003] After 2000, Professor Jiang Guancheng and others put forward the "Basic Theory System of Gas Wetness of Porous Media Oil and Gas Reservoirs" for the first time, and established the theory of amphiphobic properties of rock surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/42C09K8/22C09K8/24C09K8/504C09K8/506E21B21/00
CPCC09K8/03C09K8/032C09K8/035C09K8/426C09K8/5045C09K8/506C09K8/22C09K8/24E21B21/00C09K2208/10C09K2208/34C09K8/04C09K8/508C09K8/516C09K2208/12
Inventor 全晓虎曹宇尤维志杨静王义虎马洪礼黄耀存尤志良刘志华倪长宇余加水刘鹏王亚超黄凯杜庆福吴义成刘祖磊
Owner BEIJING SHIDABOCHENG TECH
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