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A kind of oil-based mud flushing liquid suitable for high-temperature and high-salt environment and preparation method thereof

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

Active Publication Date: 2015-12-09
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-based mud flushing fluid with high flushing efficiency and low cost, which is suitable for high temperature and high salt environments. Mud flushing liquid, and a preparation method of the oil-based mud flushing liquid is provided at the same time

Method used

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  • A kind of oil-based mud flushing liquid suitable for high-temperature and high-salt environment and preparation method thereof
  • A kind of oil-based mud flushing liquid suitable for high-temperature and high-salt environment and preparation method thereof
  • A kind of oil-based mud flushing liquid suitable for high-temperature and high-salt environment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In 100 parts by weight, respectively take by weighing the following components: 55 parts of clear water, inorganic salt CaCl 2 40 parts, 2.5 parts of ionic surfactant AES, and 2.5 parts of non-ionic surfactant (a mixture of C12EO4 and C12EO23 in a weight ratio of 1:1). The above components are mixed, heated to 80° C. under stirring to make the mixing uniform, and then naturally cooled to room temperature to obtain the oil-based mud flushing liquid.

[0032] Investigate the flushing effect of the prepared oil-based mud flushing solution: (1) Immerse the inner cylinder of the six-speed rotational viscometer in water for 30 minutes, take it out and dry it at room temperature (25°C) for 40 minutes, and weigh W1; Immerse the inner cylinder of the rotational viscometer in oil-based drilling fluid for 30 minutes, take it out, dry it at room temperature for 40 minutes, and weigh W2; (3) Slowly push the inner cylinder up and hang it, and pour the flushing fluid with a temperatur...

Embodiment 2

[0038] In 100 parts by weight, respectively take by weighing the following components: 53 parts of clear water, inorganic salt CaCl 2 40 parts, 3.5 parts of ionic surfactant AES, and 3.5 parts of non-ionic surfactant (a mixture of C12EO4 and C12EO23 in a weight ratio of 1:1). The above components are mixed, heated to 80° C. under stirring, mixed evenly, and then cooled to room temperature naturally to obtain the oil-based mud flushing liquid. According to the method of Example 1, the flushing efficiency and the contact angle after flushing of the oil-based mud flushing liquid were investigated. Data are as follows:

[0039] rinse temperature

Embodiment 3

[0041] In 100 parts by weight, respectively take by weighing the following components: 60 parts of clear water, inorganic salt CaCl 235 parts, 2.5 parts of ionic surfactant AES, 2.5 parts of nonionic surfactant (a mixture of C12EO4 and C12EO23 in a weight ratio of 2:3). The above-mentioned components are mixed, heated to 80°C under stirring, mixed evenly, and then naturally cooled to room temperature to obtain an oil-based mud flushing fluid. According to the method of Example 1, the flushing efficiency of the oil-based mud flushing fluid and the contact angle after flushing 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 and a preparation method thereof, which can effectively change the wettability of the casing wall and the well wall interface under harsh environments such as high temperature and high salt, and has high flushing efficiency and a preparation method thereof, belonging to the mud flushing fluid technology field. Background technique [0002] Flushing fluid is a cementing pre-fluid. It is used before cementing and cementing. It is mainly used to clean wellbore oil stains and cement drilling fluid, improve the hydrophilic performance of the second cementing interface, and improve the cementing performance and replacement of the cement ring interface. efficiency, so as to ensure the cementing quality. 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 flushin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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