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High-temperature-resistant tackifying rheology modifier for drilling fluids, and preparation method thereof, and drilling fluid

A drilling fluid and high temperature resistance technology, which is applied in the field of oil field drilling fluid, can solve the problems of insufficient temperature resistance of viscosifiers, achieve excellent thermal stability, improve drilling efficiency, and reduce friction and torque

Inactive Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to overcome the problem of insufficient temperature resistance of the commonly used viscosifiers in the existing soil-free water-based drilling fluids. This application applies calcium alginate microgel as a high temperature resistant viscosifier to drilling fluids

Method used

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  • High-temperature-resistant tackifying rheology modifier for drilling fluids, and preparation method thereof, and drilling fluid

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Experimental program
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Effect test

Embodiment 1

[0056] Place a 500mL beaker in a constant temperature water bath, add 200g of a 1% weight concentration sodium alginate solution, stir with a shear emulsifying mixer at 1500 rpm, and simultaneously raise the temperature to 40°C. After the temperature rises to the specified value, slowly add 50 g of calcium chloride solution with a concentration of 0.5% by weight to the flask through a peristaltic pump while stirring. 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 powdered calcium alginate microgel. The product calcium alginate microgel was determined as spherical particles with an average particle diameter of 535 nm by transmission electron microscopy (TEM).

Embodiment 2

[0058] Place a 500mL beaker in a constant temperature water bath, add 200g of a 2% weight concentration sodium alginate solution, stir with a shear emulsifying stirrer at 1500 rpm, and simultaneously raise the temperature to 40°C. After the temperature rises to the specified value, slowly add 50 g of calcium chloride solution with a concentration of 0.5% by weight to the flask through a peristaltic pump while stirring. 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 powdered calcium alginate microgel. The product calcium alginate microgel was determined to be spherical particles with an average particle diameter of 458 nm by transmission electron microscopy (TEM).

Embodiment 3

[0060] Place a 500mL beaker in a constant temperature water bath, add 200g of a 4% weight concentration sodium alginate solution, stir with a shear emulsifying mixer at 1500 rpm, and simultaneously raise the temperature to 40°C. After the temperature rises to the specified value, slowly add 50 g of calcium chloride solution with a concentration of 0.5% by weight to the flask through a peristaltic pump while stirring. 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 powdered calcium alginate microgel. The product calcium alginate microgel was determined as spherical particles with an average particle diameter of 286 nm by transmission electron microscopy (TEM).

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Abstract

The invention relates to a high-temperature-resistant tackifying rheology modifier for drilling fluids, and a preparation method thereof, and a drilling fluid, and belongs to the technical field of oil field drilling fluids. According to the present invention, the high-temperature-resistant tackifying rheology modifier is a calcium alginate micro-gel, which is spherical particles, wherein the calcium alginate micro-gel has an average particle size (D50) of 200-1000 nm, preferably 200-800 nm, more preferably 200-400 nm, and is prepared by carrying out a cross-linking reaction on sodium alginateand calcium chloride; the use amount of the high-temperature-resistant tackifying rheology modifier is 0.1-5 parts by weight, preferably 0.2-3 parts by weight, more preferably 0.5-1 part by weight byusing the water in the high-temperature-resistant soilless phase water-based drilling fluid as 100 parts by weight; and the high-temperature-resistant soilless phase water-based drilling fluid has excellent thermal stability, can resist a temperature of 160 DEG C, is suitable for deep horizontal well drilling operations, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluids, and more particularly, relates to a high-temperature viscosity-increasing and shear-reducing agent for drilling fluids, a preparation method thereof, and drilling fluids. 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 pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/12C09K8/90C09K8/88C08B37/04
CPCC08B37/0084C09K8/035C09K8/12C09K8/887C09K8/90C09K2208/10C09K2208/12C09K2208/34
Inventor 宣扬林永学杨小华陈铖钱晓琳徐江
Owner CHINA PETROLEUM & CHEM CORP
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