High-temperature-resistant oil-based foam drilling fluid and preparation method thereof

A technology for high temperature resistance and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of short half-life of oil-based foam drilling fluid, etc., and achieve strong rock-carrying ability, prevent lost circulation and stable performance Effect

Active Publication Date: 2022-05-06
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oil-based foam drilling fluid still has the problem of short half-life

Method used

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  • High-temperature-resistant oil-based foam drilling fluid and preparation method thereof
  • High-temperature-resistant oil-based foam drilling fluid and preparation method thereof
  • High-temperature-resistant oil-based foam drilling fluid and preparation method thereof

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Effect test

preparation example Construction

[0045] An embodiment of the present invention provides a method for preparing the above-mentioned high temperature resistant oil-based foam drilling fluid, comprising: mixing a foaming agent, a foam stabilizer, an emulsifier, water and a base oil according to the proportion, Stir to form foam to obtain high temperature resistant oil-based foam drilling fluid.

[0046] Specifically, the preparation method of the oil-based foam drilling fluid is:

[0047] Add 100-120mL of base oil into the high stirring cup, then add a small amount of foaming agent, foam stabilizer, emulsifier and a small amount of water in turn, and stir for 5-10 minutes at high speed for each treatment agent added, at a speed of 10000-12000r / min After adding all the ingredients, keep stirring until the volume of the foam no longer increases, that is to say.

[0048] In the embodiment of the present invention, the above-mentioned high stirring cup can be removed, the foam drilling fluid is poured into a 1000mL...

Embodiment 1

[0058] Take 120mL of diesel oil, add the amount of treating agent according to the volume percentage of base oil, add 1% YF-10, 1% YF111, 1% span80, 1% silicone 2235 surfactant in sequence, and stir at 12000r / min until The foam volume does not increase any more.

[0059] The specific operation steps are as follows:

[0060] (1) Use a graduated cylinder to measure 120mL of diesel oil and add it to a high stirring cup, add 1% YF-10 to the high stirring cup, then place it in a water bath at 60°C and heat it, stirring constantly to completely disperse the solid in the diesel oil, stirring at high speed for 5 minutes , no large amount of foam was found.

[0061] (2) Continue to add 1% YF111 to (1), stir at high speed for 5 minutes, the foam will increase, but the foam will not be fine and fine, and the foam will disappear quickly.

[0062] (3) Add 1% span80 to (2), stir at high speed for 5 minutes, the foam is delicate and the foam quality is improved.

[0063] (4) Continue to a...

Embodiment 2

[0069] Take 120mL of diesel oil and pour it into a high stirring cup, then add 1% silicone 4018 surfactant, 1% YF-10, 1% span80, 1% YF-111 in sequence, the preparation process is as in Example 1. The volume of the foam no longer increases, pour it into a graduated cylinder to measure the volume, and press the stopwatch to record the time to obtain its half-life.

[0070] The result of foaming is: the volume of foam is 736mL, the half-life is 15min, and the quality of foam is 83.7%.

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Abstract

The invention provides a high-temperature-resistant oil-based foam drilling fluid and a preparation method thereof. The drilling fluid comprises the following components in parts by volume: 100 parts of a continuous medium; 1-2 parts by mass of a foaming agent; 1-3 parts by mass of a foam stabilizer; 0-2 parts by mass of an emulsifier; the continuous medium comprises 90-95 parts of base oil and 0-5 parts of water; the foaming agent is selected from one or more of a fluorocarbon cationic surface active agent and a methyl organic silicon surface active agent. The oil-based foam drilling fluid provided by the invention is stable in performance and good in temperature resistance, and is suitable for unbalanced drilling, low-pressure hydrocarbon reservoirs and exhausted water-sensitive stratums for transformation of gas storages and the like. The oil-based foam drilling fluid can realize safe and rapid drilling in unbalanced drilling, and can effectively inhibit the problems of collapse, hole shrinkage and the like caused by a water-sensitive effect in the drilling process; in addition, the system can especially meet the requirements of drilling of hydrated stratums with low pressure coefficients and special construction of oil and gas depleted stratums for transformation of gas storages and the like.

Description

technical field [0001] The invention belongs to the technical field of oil-gas well process drilling fluids, and in particular relates to a high-temperature resistant oil-based foam drilling fluid and a preparation method thereof, which are suitable for unconventional oil and gas reservoirs with low formation pressure coefficients. Background technique [0002] In recent years, with the development of low-pressure oil and gas and the construction of gas storages, depleted formations, low-pressure formations, and low-pressure and strong water-sensitive formations have emerged, all of which pose great challenges to low-density or ultra-low-density drilling fluids. At present, most of the conventional foam drilling fluids use the water phase as the continuous medium, rely on the action of the foaming agent, and form foam by mixing with air. Due to the high density of the base fluid, the degree of reduction of the system density is limited by objective conditions. Water-based fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36C09K8/38
CPCC09K8/36C09K8/38C09K2208/12
Inventor 梁庆磊孙举王旭谢建宇苏雪霞杨朝光
Owner 中石化石油工程技术服务有限公司
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