Environmentally-friendly high-temperature-resistant synthetic base foam drilling fluid and preparation method thereof

A high-temperature resistant, synthetic-based technology, applied in the field of drilling, can solve the problems of poor temperature resistance, weak anti-pollution ability, unstable foam system, etc., and achieve good effect and excellent performance

Inactive Publication Date: 2012-07-11
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although water-based foam drilling fluids have been widely used in controlling fluid loss, reducing differential pressure sticking, and preventing and plugging leaks, they still cannot effectively solve the problem of reservoir damage when drilling into water-sensitive formations. The study of fluid is of great significance to effectively solve problems such as shale hydration and reservoir protection during drilling
[0004] At present, the research on oil-based foam drilling fluid has just started at home and abroad, and some progress has been made. Generally speaking, there are still problems such as unstable foam system, poor temperature resistance, and weak anti-pollution ability. In addition, many foam base fluids are used. It is a highly toxic diesel, which is not easy to biodegrade in the environment, causing environmental pollution

Method used

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  • Environmentally-friendly high-temperature-resistant synthetic base foam drilling fluid and preparation method thereof
  • Environmentally-friendly high-temperature-resistant synthetic base foam drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The preparation steps of high-temperature oil-based foam stabilizer (oil-soluble polymer polybasic fatty acid alkanolamide ether) specifically include:

[0021] (1) Add 200g of dibasic acid (M=260), 80g of anhydrous methanol, and 1g of concentrated sulfuric acid in a 500mL glass reactor in sequence, and slowly raise the temperature to 85-90°C under stirring conditions, keep the temperature for 0.5h, and then add to the reaction Add 70g of anhydrous methanol to the vessel, keep the temperature constant for 1h, raise the temperature to 100°C, keep the temperature constant for 20min, cool down to 50°C, and discharge. Washing the reaction product with water until the pH value reaches neutrality to obtain polybasic fatty acid methyl esters;

[0022] (2) Add 100 g of the polybasic fatty acid methyl ester prepared in (1) into the aforementioned reactor, vacuum dehydrate, then add 100 g of diesel oil, 38 g of diethanolamine, and 0.8 g of NaOH, raise the temperature to 120 ° C, ...

Embodiment 2

[0025] (1) Weigh 92g of α-olefin into a 100mL beaker, add 3g of the polybasic fatty acid alkanolamide ether synthesized in Example 1 and stir to dissolve, then add 3g of organic soil () under stirring to disperse the organic soil evenly, and then add 2g octadecylsulfonic acid, stirred gently to dissolve;

[0026] (2) Transfer the above-mentioned foam liquid to a high-speed stirrer, and stir the foam base liquid at a high speed of 12000r / min for 1 min to obtain the synthetic base foam drilling fluid.

Embodiment 3

[0028] (1) Weigh 95g of α-olefin in a 100mL beaker, add 2g of the polybasic fatty acid alkanolamide ether synthesized in Example 1 and stir to dissolve, then add 2g of organic soil under stirring to make the organic soil evenly dispersed, then add 1.5g Eicosylsulfonic acid, stirred gently to dissolve;

[0029] (2) Transfer the above-mentioned foam liquid to a high-speed stirrer, and stir the foam base liquid at a high speed of 12000r / min for 1 min to obtain the synthetic base foam drilling fluid.

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Abstract

The invention discloses environmentally-friendly high-temperature-resistant synthetic base foam drilling fluid and a preparation method thereof. The drilling fluid comprises the following components in parts by weight: 1-3 parts of organic soil, 1-2 parts of high-temperature oil-based foaming agent, 1-3 parts of self-made high-temperature oil-based foam stabilizer and 92-97 parts of synthetic base liquid namely alpha-olefin. The dispersion medium of the synthetic base foam drilling fluid is foam liquid using alpha-olefin as the main component, the dispersed phase is air, and the drilling fluid is prepared through high-speed stirring. The drilling liquid system has stable performance, good heat resistance and antipollution capability and good compatibility to the reservoir; and the drilling fluid can be used in deep well underbalanced drilling and can be used to effectively inhibit the hydration and expansion of the shale, stabilize the well wall, prevent well leakage and protect the oil and gas formation. In addition, the synthetic base liquid namely alpha-olefin and the foaming agent are both non-toxic, are biodegradable and have no harmful effect on the environment.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to an environment-friendly high temperature resistant synthetic base foam drilling fluid and a preparation method thereof. Background technique [0002] With the increasing demand for oil and gas resources, coalbed methane, shale gas, ultra-low pressure formations and mature oil and gas fields in the middle and later stages have also become important targets for exploration and development, and it is necessary to develop low-density drilling fluids. At present, the main low-density drilling fluids are mist fluid and water-based foam. The use of low-density drilling fluid can effectively reduce fluid loss, reduce pressure differential sticking accidents, prevent lost circulation, increase ROP, and minimize drilling fluid loss. Damage to oil and gas reservoirs. The liquid phase of water-based foam drilling fluid is generally fresh water or brine, and the gas phase is generally air, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38
Inventor 王富华王瑞和张德文张德武谭学超张忻
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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