A water-based drilling fluid anti-high temperature viscosity increasing and shearing agent and its preparation method and drilling fluid

A technology for water-based drilling fluid and high temperature resistance, applied in the field of oilfield drilling fluids, can solve the problems of insufficient temperature resistance, and achieve the effects of improving drilling efficiency, reducing sticking, and excellent resistance to temperature and oxidation.

Active Publication Date: 2021-06-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water-based drilling fluid anti-high temperature viscosity increasing and shearing agent of the present invention selects a kind of starch microgel, which overcomes the problem of insufficient temperature resistance of the conventional viscosity increasing and shearing agent commonly used in the existing soil-free water-based drilling fluid

Method used

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  • A water-based drilling fluid anti-high temperature viscosity increasing and shearing agent and its preparation method and drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 100 g of 0.25 mol / L NaOH aqueous solution in the beaker, then add 20 g of potato starch. Stir the dispersion at high speed at 50°C until all the starch is dissolved, then add 1 g of epichlorohydrin to the beaker. After fully mixing and standing still, the water phase in the mixed solution was poured into a three-necked flask, and 5 g of Span-80 and 100 g of cyclohexane were added to the flask. The obtained white emulsion was stirred at high speed (20000 rpm) for 10 min at 35° C., and then continued to react at room temperature with low speed stirring (800 rpm) for 20 h. After the reaction was complete, the emulsion was transferred to a separatory funnel, and the aqueous phase containing the starch microgel was separated with 250 mL of acetic acid. The obtained product aqueous solution was centrifuged to separate the solid phase, washed repeatedly with deionized water and ethanol several times, and then vacuum-dried at 60° C. for 16 hours to finally obtain powdery s...

Embodiment 2

[0056] Add 100 g of 0.25 mol / L NaOH aqueous solution in the beaker, then add 20 g of potato starch. Stir the dispersion at high speed at 50 °C until all the starch is dissolved, then add 2 g of epichlorohydrin to the beaker. After fully mixing and standing still, the water phase in the mixed solution was poured into a three-necked flask, and 5 g of Span-80 and 100 g of cyclohexane were added to the flask. The obtained white emulsion was stirred at high speed (20000 rpm) for 10 min at 35° C., and then continued to react at room temperature with low speed stirring (800 rpm) for 20 h. After the reaction was complete, the emulsion was transferred to a separatory funnel, and the aqueous phase containing the starch microgel was separated with 250 mL of acetic acid. The obtained product aqueous solution was centrifuged to separate the solid phase, washed repeatedly with deionized water and ethanol several times, and then vacuum-dried at 60° C. for 16 hours to finally obtain powdery ...

Embodiment 3

[0058] Add 100 g of 0.25 mol / L NaOH aqueous solution in the beaker, then add 20 g of potato starch. Stir the dispersion at high speed at 50°C until all the starch is dissolved, then pour 6g of epichlorohydrin into the beaker. After fully mixing and standing still, the water phase in the mixed solution was poured into a three-necked flask, and 5 g of Span-80 and 100 g of cyclohexane were added to the flask. The obtained white emulsion was stirred at high speed (20000 rpm) for 10 min at 35° C., and then continued to react at room temperature with low speed stirring (800 rpm) for 20 h. After the reaction was complete, the emulsion was transferred to a separatory funnel, and the aqueous phase containing the starch microgel was separated with 250 mL of acetic acid. The obtained product aqueous solution was centrifuged to separate the solid phase, washed repeatedly with deionized water and ethanol several times, and then vacuum-dried at 60° C. for 16 hours to finally obtain powdery...

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Abstract

The invention relates to a water-based drilling fluid anti-high temperature viscosity-increasing and shearing-lifting agent in the technical field of oilfield drilling fluid, a preparation method thereof and drilling fluid. The water-based drilling fluid anti-high temperature viscosity increasing and cutting agent is starch microgel; the average particle diameter of the starch microgel is 100-500nm, preferably 100-300nm, more preferably 100-200nm; the starch microgel Microgels are preferably spherical particles. The high temperature resistant soil-free water-based drilling fluid of the present invention uses the starch microgel as a high-temperature viscosity-increasing and shearing agent, which overcomes the temperature resistance of the conventional viscosity-increasing and shearing agents in the existing soil-free water-based drilling fluid. The problem of insufficient performance. The drilling fluid containing the viscosity-increasing and shear-increasing agent of the present invention can play a good role in increasing viscosity and increasing shear at a high temperature of 150°C, so that the clay-free drilling fluid system can be applied to horizontal wells with a well temperature of about 150°C, and has a good application prospects.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluids, and more particularly, relates to a water-based drilling fluid anti-high temperature viscosity increasing and cutting agent, a preparation method thereof and drilling fluid. Background technique [0002] With the depletion of oil and gas resources, deep horizontal well drilling has gradually become an important technical means to develop deep oil and gas reservoirs. Due to the deep burial of oil and gas reservoirs and deep build-up points, there are high friction and torque during the drilling process of the build-up section and horizontal section of deep horizontal wells, which not only seriously affects the drilling speed and wellbore trajectory control, but also threatens the drilling process. The safety of operation is the core problem restricting the extension length of the horizontal section of deep horizontal wells, which puts forward higher requirements on the lubricating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/08C08J3/24C08J3/075C08L3/02
CPCC08J3/075C08J3/24C08J2303/02C09K8/035C09K8/08C09K2208/34
Inventor 钱晓琳宣扬林永学徐江王海波高伟
Owner CHINA PETROLEUM & CHEM CORP
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