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High-efficiency oil-based flushing spacer liquid and preparation method thereof

A flushing isolation fluid and oil-based technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor interface cementation quality, fluid interface contact pollution, etc., achieve good flushing ability, reduce design difficulty, and good The effect of suspension stability

Inactive Publication Date: 2014-02-05
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a flushing and isolation fluid for oil-based drilling fluid and its preparation method, so as to solve the problems of fluid interface contact pollution and poor interface cementation quality in cementing operations.

Method used

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  • High-efficiency oil-based flushing spacer liquid and preparation method thereof
  • High-efficiency oil-based flushing spacer liquid and preparation method thereof
  • High-efficiency oil-based flushing spacer liquid and preparation method thereof

Examples

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Effect test

preparation example Construction

[0018] The preparation method of the flushing spacer is as follows: divide 100 parts of clear water into two equal parts, add 2.0 to 4.0 parts (calculated according to the total amount of clear water, the same below) of suspension stabilizer to one part of the clear water, stir for 30 minutes, place at room temperature for 24 hours, and then Add 0.5-0.75 parts of viscosifying agent, 4.0-5.0 parts of chelating agent, and 1.0-1.5 parts of surfactant in sequence, and stir evenly. Add 0.6-0.8 parts of thickening agent to another part of clear water, stir for 30 minutes, mix the two parts of the solution and stir evenly, add 25-150 parts of weighting agent to the required density, and then add 1.0-5.0 parts of pH value regulator to make washing and isolation The pH value of the liquid is 8-11, stir for 1 hour, and finally add 0.2-0.4 part of defoamer according to the actual situation.

[0019] In the preparation method of the flushing spacer, 100 parts of clear water are divided in...

Embodiment 1

[0023] Example 1. Prepare 1# (with a density of 1.12g / cm 3 ) flush the spacer. According to the standard SY / T5374-2000 oil and gas well cementing prefluid usage method, the flushing effect of the flushing isolation fluid is tested. The instrument used in the experiment is a six-speed rotational viscometer with a set speed of 200 rpm, and the oil-based drilling fluid used is self-made. The flushing time is 5 minutes, and the flushing efficiency is 100%.

Embodiment 2

[0024] Example 2, according to the preparation method of the above-mentioned flushing spacer and the distribution ratio of each component in the attached table 1, 4# (density 1.40g / cm 3 ) flush the spacer. According to the standard SY / T5374-2000 oil and gas well cementing prefluid usage method, the flushing effect of the flushing isolation fluid is tested. The instrument used in the experiment is a six-speed rotational viscometer with a set speed of 200 rpm, and the oil-based drilling fluid used is self-made. The flushing time is 4.5min, and the flushing efficiency is 100%.

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Abstract

The invention relates to a high-efficiency oil-based flushing spacer liquid. The flushing spacer liquid is prepared from the following components in parts by weight: 100 parts of clear water, 1.0-1.5 parts of a surfactant, 4.0-5.0 parts of a chelating agent, 2.0-4.0 parts of a suspension stabilizer, 0.6-0.8 part of a tackifier, 0.5-0.75 part of a viscosity enhancer, 25-15 parts of a weighting agent, 1.0-5.0 parts of a pH regulator, and 0.2-0.4 part of a defoaming agent. The invention provides a special high-efficiency flushing spacer liquid for oil-based drilling fluid, which has dual functions of flushing and spacing, is high in flushing efficiency, wide in density adjusting range and good in suspension stability, and can effectively improve the conditions of interfacial cementation and improve the quality of well cementation.

Description

Technical field: [0001] The invention relates to the cementing technology of oilfield drilling engineering, and belongs to the field of cementing prefluid technology, and relates to a high-efficiency oil-based flushing spacer fluid and a preparation method thereof. Background technique: [0002] For a well (especially a development well), the quality of cementing directly affects whether the well can continue to be drilled, whether it can be produced smoothly, and directly affects the life of the oil well and the recovery rate of the oil and gas reservoir. [0003] In cementing operations, in order to improve the efficiency of cement slurry replacing drilling fluid and improve the cement sheath cementation quality, a liquid is often injected between the drilling fluid and the cement slurry, which is called preflush. Prefluid can be divided into flushing fluid and spacer fluid according to its properties. Flushing fluid is usually prepared by adding surfactants to water or d...

Claims

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Application Information

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IPC IPC(8): C09K8/40C09K8/52
CPCC09K8/40C09K8/52
Inventor 梁吉艳孟静王松崔菊梅吴心雨王海燕
Owner SHENYANG POLYTECHNIC UNIV
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