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High-temperature water-based drilling fluid and preparation method thereof

A water-based drilling fluid and high-temperature technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as mud cake thickening, high-temperature thickening, and filtration loss increase

Active Publication Date: 2020-07-28
BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the deep development of oil drilling, the bottom hole temperature is getting higher and higher (>180°C), conventional drilling fluids are prone to high-temperature degradation, cross-linking, and dehydration, resulting in high-temperature thickening, mud cake thickening, and filtration loss. rising etc.

Method used

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  • High-temperature water-based drilling fluid and preparation method thereof
  • High-temperature water-based drilling fluid and preparation method thereof
  • High-temperature water-based drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1a

[0034] High-temperature water-based drilling fluid, including: 103 parts by weight of base slurry, 1 part of fluid loss additive I, 1.5 parts of fluid loss additive II, 2 parts of fluid loss additive III, 2 parts of polyethylene glycol, 1 1 part of aminosilanol, 3 parts of potassium chloride, 2 parts of lubricant, 0.6 part of 600-800 mesh calcium carbonate powder, 1.2 parts of 400-500 mesh modified diatomite, and the addition amount is to increase the weight of high-temperature water-based drilling fluid to 1.4g / cm 3barite;

[0035] Wherein, the base slurry includes water, calcareous bentonite, sodium carbonate, and sodium hydroxide with a mass ratio of 100:2:0.15:0.2;

[0036] Fluid loss reducer I is a graft copolymer with corrosive acid as the skeleton;

[0037] Fluid loss reducer II is a composition composed of fluid loss reducer I, 1000-2000 mesh calcium carbonate powder as the core, and medium softening point asphalt as the shell, wherein the softening point of the medi...

Embodiment 1b

[0040] The preparation method of high-temperature water-based drilling fluid comprises the following steps according to the dosage of :

[0041] S1. Preparation of fluid loss reducer II: Add medium softening point asphalt into the asphalt tank and heat until dissolved, stir and mix evenly, add fluid loss reducer I, 1000-2000 mesh calcium carbonate powder, stir until fully mixed, then cool and grind to 400-500 mesh, that's all;

[0042] S2. Preparation of fluid loss additive III: add high softening point asphalt into the asphalt tank and heat until dissolved, pave to form an asphalt layer with a height (thickness) of 2-3 μm, spread fluid loss additive I evenly on the asphalt layer, Cool and pulverize to 600-800 mesh to obtain half-coated fluid loss reducer I; add asphalt with medium softening point into the asphalt tank and heat until dissolved, add half-coated fluid loss reducer I, stir until fully mixed, cool and grind to 400-500 mesh, that's all;

[0043] S3, in parts by w...

Embodiment 2a

[0048] High-temperature water-based drilling fluid, including: 104 parts by weight of base slurry, 1.5 parts of fluid loss control agent I, 2 parts of fluid loss control agent II, 2.5 parts of fluid loss control agent III, 2 parts of polyethylene glycol, 1.5 parts 1 part of aminosilanol, 5 parts of potassium chloride, 2.5 parts of lubricant, 1 part of 600-800 mesh calcium carbonate powder, 1.5 parts of 400-500 mesh modified diatomite, and the addition amount is to increase the weight of high-temperature water-based drilling fluid to 1.4g / cm 3 barite;

[0049] Wherein, the base slurry includes water, calcareous bentonite, sodium carbonate, and sodium hydroxide with a mass ratio of 100:2:0.15:0.2;

[0050] Fluid loss reducer I is a graft copolymer with corrosive acid as the skeleton;

[0051] Fluid loss reducer II is a composition composed of fluid loss reducer I, 1000-2000 mesh calcium carbonate powder as the core, and medium softening point asphalt as the shell, wherein the ...

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Abstract

The invention discloses a high-temperature water-based drilling fluid. The high-temperature water-based drilling fluid comprises, by weight, 103 to 104 parts of base slurry, 1 to 1.5 parts of a filtrate reducer I, 1.5 to 2 parts of a filtrate reducer II, 2 to 2.5 parts of a filtrate reducer III, 2 parts of polyethylene glycol, 1 to 1.5 parts of aminosilanol, 3 to 5 parts of potassium chloride, 2 to 2.5 parts of a lubricant, 0.6 to 1 part of calcium carbonate powder with a size of 600 to 800 meshes, 1.2 to 1.5 parts of modified diatomite with a size of 400 to 500 meshes and barite with an addition amount that allows the high-temperature water-based drilling fluid to be weighted to 1.4-1.7 g / cm<3>. The invention also discloses a preparation method of the high-temperature water-based drillingfluid. The drilling fluid has the beneficial effects of resisting high temperature and reducing the permeability and the filter loss of the drilling fluid.

Description

technical field [0001] The invention relates to the field of water-based drilling fluid preparation. More specifically, the present invention relates to a high-temperature water-based drilling fluid and a preparation method thereof. Background technique [0002] Rotary drilling is the most commonly used drilling technology in today's oilfields. During the drilling process, cuttings will accumulate. In order to facilitate the continuation of drilling, the cuttings must be continuously removed from the vicinity of the drill bit at the bottom of the hole. Drilling fluid is pumped into the downhole through the drill pipe, and is pumped out through the nozzle on the drill bit, carrying the cuttings through the annular space between the formation and the drill pipe and discharged from the downhole to the surface. According to different fluid media, drilling fluid can be divided into water-based, oil-based, synthetic-based, foam-based, gas-based, etc. For reasons of economy and e...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12
Inventor 孟虎刘亚东朱国伟吴骏峰
Owner BEIJING DADE GUANGYUAN PETROLEUM TECH SERVICE
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