Oil-based mud flushing fluid suitable for high temperature high salt environment and preparation method of oil-based mud flushing fluid

A technology of oil-based mud, high temperature and high salt, applied in the field of mud flushing fluid, to achieve the effect of simple preparation and low cost

Active Publication Date: 2014-02-05
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problem that the existing oil-based mud flushing fluid is not suitable for harsh environments such as high temperature and high salt, and has limitations in practical application, the present invention provides an oil-base

Method used

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  • Oil-based mud flushing fluid suitable for high temperature high salt environment and preparation method of oil-based mud flushing fluid
  • Oil-based mud flushing fluid suitable for high temperature high salt environment and preparation method of oil-based mud flushing fluid
  • Oil-based mud flushing fluid suitable for high temperature high salt environment and preparation method of oil-based mud flushing fluid

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Based on 100 parts by weight, weigh out the following components: 55 parts of clear water, inorganic salt CaCl 2 40 parts, 2.5 parts of ionic surfactant AES, 2.5 parts of non-ionic surfactant (mixture of C12EO4 and C12EO23 by weight ratio of 1:1). The above components are mixed, heated to 80°C under stirring to make the mixture uniform, and then naturally cooled to room temperature to obtain an oil-based mud rinse.

[0032] Investigate the washing effect of the oil-based mud washing solution: (1) Immerse the inner cylinder of the six-speed rotary viscometer in water for 30 minutes, take it out and dry it at room temperature (25°C) for 40 minutes, and weigh W1; The inner cylinder of the rotational viscometer was immersed in oil-based drilling fluid for 30 minutes, and after taking it out, it was dried at room temperature for 40 minutes and weighed W2; (3) Push the inner cylinder up slowly and hang it, and pour the flushing fluid with a temperature of 75-85℃...

Example Embodiment

[0037] Example 2

[0038] Based on 100 parts by weight, weigh out the following components: 53 parts of clear water, inorganic salt CaCl 2 40 parts, 3.5 parts of ionic surface active agent AES, 3.5 parts of non-ionic surface active agent (a mixture of C12EO4 and C12EO23 by weight ratio of 1:1). The above components are mixed, heated to 80°C under stirring, mixed uniformly, and then naturally cooled to room temperature to obtain an oil-based mud rinse. According to the method of Example 1, the washing efficiency of the oil-based mud washing liquid and the contact angle after washing were investigated. Data are as follows:

[0039] Rinse temperature

Example Embodiment

[0040] Example 3

[0041] Based on 100 parts by weight, weigh the following components: 60 parts of water, inorganic salt CaCl 2 35 parts, 2.5 parts of ionic surfactant AES, 2.5 parts of non-ionic surfactant (a mixture of C12EO4 and C12EO23 in a weight ratio of 2:3). The above components are mixed, heated to 80°C under stirring, mixed uniformly, and then naturally cooled to room temperature to obtain an oil-based mud rinse. According to the method of Example 1, the washing efficiency of the oil-based mud washing liquid and the contact angle after washing were investigated. Data are as follows:

[0042] Rinse temperature

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Abstract

The invention discloses an oil-based mud flushing fluid suitable for high temperature high salt environment and a preparation method of the oil-based mud flushing fluid. The oil-based mud flushing fluid comprises the following components based on 100 parts by weight: 35-40 parts of inorganic salt CaCl2, 2.5-3.5 parts of ionic surfactant, 2.5-3.89 parts of nonionic surfactant, and the balance of clear water; the nonionic surfactant is a mixture of C12EO4 and C12EO23 in a lauric alcohol ethoxylate nonionic surfactant in a weight ratio of 2: 3-3: 2; the preparation method comprises the following steps: mixing above components; heating to 80 DEG.C under stirring, uniformly mixing, naturally cooling to room temperature to obtain the oil-based mud flushing fluid. The prepared oil-based mud flushing fluid is suitable for high temperature and high salt environments and other severe rugged environments, capable of effectively changing wettability of sleeve wall and well wall interface, the contact angle after flushing is less than 27 DEG, the flushing efficiency is more than 95%, the preparation is simple, the cost is low, and the environment-friendly and various industrial requirements are satisfied.

Description

technical field [0001] The invention relates to an oil-based mud flushing fluid capable of effectively changing the wettability of casing wall and borehole wall interface in harsh environments such as high temperature and high salt and having high flushing efficiency and a preparation method thereof, belonging to mud flushing fluid technology field. Background technique [0002] The flushing fluid belongs to the pre-cementing fluid. It is used before cementing and cementing. It is mainly used to clean the oil on the well wall and gel the drilling fluid, improve the hydrophilic property of the cementing interface, and improve the cementing performance and displacement of the cement ring interface. Efficiency, thus ensuring the quality of cementing. There are many types of oil-based mud flushing fluids currently used, and a large number of literatures have reported their compositions and preparation methods. [0003] CN1174075C discloses a flushing fluid for oil-based mud ce...

Claims

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Application Information

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IPC IPC(8): C09K8/524
CPCC09K8/52
Inventor 孙德军刘潇冰王辉李超李怀科罗健生耿铁
Owner SHANDONG UNIV
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