Oil-based drilling fluid as well as preparation method and application thereof

An oil-based drilling fluid and oil phase technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of oil-based drilling fluid viscosity and shear force increase, not suitable for operation in cold areas, oil-based drilling fluid flow It can improve the flow performance, prevent the complicated situation in the well, and prevent the pipeline blockage problem.

Active Publication Date: 2022-01-07
JINGZHOU JIAHUA TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Oil-based drilling fluid systems are commonly used in the development of complex formations such as deepwater wells and unconventional oil and gas reservoirs such as shale gas at home and abroad. Oil-based drilling fluids are greatly affected by temperature. Especially when drilling in complex areas such as deep water and harsh climates, the operating temperature is as low as 0. ~15°C, some extremely cold regions or seawater temperatures are even as low as -30°C; low temperature tends to significantly increase the viscosity and shear force of oil-based drilling fluid, resulting in excessively high equivalent circulation density, and even the obvious occurrence of oil-b

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  • Oil-based drilling fluid as well as preparation method and application thereof

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preparation example Construction

[0050] In the present invention, the preparation method of the solid emulsifier comprises:

[0051] In the present invention, the first rosin and the first maleic anhydride are mixed to carry out the Diels-Alder reaction to obtain the addition product.

[0052] In the present invention, the mass ratio of the first rosin to the first maleic anhydride is preferably 40-50:15-20, more preferably 50:15, 45:18 or 40:20. In the present invention, the first rosin preferably includes one or more of gum rosin, wood rosin and tall oil rosin, more preferably gum rosin.

[0053] In the present invention, the temperature of the Diels-Alder reaction is preferably 180-220° C., more preferably 200-210° C., and the time is preferably 2-4 h, more preferably 2-3 h. In the process of the Diels-Alder reaction, the double bond of the first rosin is isomerized into L-pimorosin at 180-220°C, forming a conjugated double bond in the same alicyclic ring, and then with maleic The acid anhydride undergoe...

Embodiment 1

[0087] (1) 50 parts by weight of gum rosin was heated to melting, 15 parts by weight of maleic anhydride was added with stirring, and the temperature was raised to 220° C. Diels-Alder reaction occurred, and the reaction time was 2h to generate an addition product;

[0088] (2) 10 parts by weight of ethylenediamine was slowly added dropwise to the generated addition product (dropping was completed in 5 minutes), and an acylation reaction occurred, and the reaction was carried out for 4 h, and the product was the initial reaction material; Add 10 parts by weight of maleic anhydride to the material, react for 1.5h;

[0089](3) adding 15 parts by weight of calcium oxide to the product of step (2), at a temperature of 80 ° C, a neutralization reaction occurs for 2 h, and the solid after cooling to room temperature is pulverized to obtain a yellow powdery intermediate product;

[0090] (4) Mix 80 parts by weight of the intermediate product, 15 parts by weight of sodium dodecylbenzen...

Embodiment 2

[0103] (1) 45 parts by weight of gum rosin was heated to melting, stirred and added 18 parts by weight of maleic anhydride, heated to 180° C., Diels-Alder reaction occurred, and the reaction time was 4h to generate addition product;

[0104] (2) Slowly add 12 parts by weight of ethylenediamine dropwise to the resulting addition product (dropping is completed in 10 minutes), and an acylation reaction occurs. The reaction is performed for 1 h, and the product is the initial reaction material; after cooling to 100 ° C, at the beginning of the reaction Add 8 parts by weight of maleic anhydride to the material, and react for 1h;

[0105] (3) adding 17 parts by weight of calcium oxide to the product obtained in step (2), at a temperature of 100° C., a neutralization reaction occurs for 1 h, and the solid after cooling to room temperature is pulverized to obtain a yellow powdery intermediate product;

[0106] (4) Mix 75 parts by weight of intermediate product, 17 parts by weight of s...

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Abstract

The invention provides an oil-based drilling fluid as well as a preparation method and application thereof, and belongs to the field of petroleum and natural gas drilling. The oil phase is used as a continuous phase in the water-in-oil drilling fluid and has a certain freezing resistance; the water phase is used as an inner phase of the water-in-oil drilling fluid, so that the stability and activity balance of a well wall are ensured; the solid emulsifier plays an emulsifying role, forms stable water-in-oil drilling fluid, improves the viscosity of the drilling fluid at a low flow rate, enhances the suspension and slag-carrying capacity of the drilling fluid, is slightly influenced by the environment, and can be directly added into the oil-based drilling fluid during operation in a cold region; the organic soil can improve the stability of the water-in-oil emulsion, and can improve the viscosity and dynamic shearing force of the system; a filtrate reducer is used for reducing the filter loss of the drilling fluid; the alkalinity regulator is used for regulating the alkalinity of the drilling fluid. The oil-based drilling fluid provided by the invention still keeps a certain viscosity, shearing force and electrical stability at -10 DEG C, maintains better flowing property, and can meet the use requirements of the oil-based drilling fluid for operation in cold regions.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to an oil-based drilling fluid and a preparation method and application thereof. Background technique [0002] Oil-based drilling fluid systems are commonly used in the development of complex formations such as deepwater wells, unconventional oil and gas reservoirs, shale gas, etc. at home and abroad. Oil-based drilling fluids are greatly affected by temperature, especially when drilling in complex areas such as deep water and harsh climates, the operating temperature is as low as 0 ~15°C, some extremely cold regions or seawater temperatures are even as low as -30°C; low temperatures tend to significantly increase the viscosity and shear force of oil-based drilling fluids, resulting in excessively high equivalent circulating density, and even cause oil-based drilling fluids to appear obvious. The phenomenon of gelation causes the oil-based drilling fluid to be u...

Claims

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Application Information

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IPC IPC(8): C09K8/36
CPCC09K8/36
Inventor 由福昌许明标高阳吴娇
Owner JINGZHOU JIAHUA TECH
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