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High efficiency oil displacement cleaning fluid suitable for use in oil-based drilling fluid environment

A technology of oil-based drilling fluid and cleaning fluid, which is applied in the direction of cleaning equipment, earthwork drilling, wellbore/well parts, etc., and can solve the problems of cementing quality, oil-based drilling fluid interface cleaning difficulty, Improve the cementing bond strength, high cementing bond strength and good compatibility to solve problems such as poor rheological properties of mixed slurry

Inactive Publication Date: 2019-11-15
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problems brought by oil-based drilling fluid to cementing are: difficulty in oil-based drilling fluid replacement and interface cleaning, poor rheological properties of mixing slurry, and serious decrease in mixing slurry strength, etc.
In particular, there is oily mud cake on the well wall, oil-based drilling fluid adheres to the casing wall, and the open hole section is long, and the water-based completion fluid has poor flushing effect on the oil film, which affects the bonding strength of the cement sheath and the primary and secondary interfaces. cementing quality, which further makes it difficult to improve the cementing quality

Method used

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  • High efficiency oil displacement cleaning fluid suitable for use in oil-based drilling fluid environment
  • High efficiency oil displacement cleaning fluid suitable for use in oil-based drilling fluid environment
  • High efficiency oil displacement cleaning fluid suitable for use in oil-based drilling fluid environment

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Effect test

Embodiment 1

[0025] Example 1, see Figure 1 to Figure 3 :

[0026] The invention provides a high-efficiency oil-displacement cleaning fluid suitable for use in an oil-based drilling fluid environment, comprising the following components: 500ml of water, surfactants (polysorbate, coconut oil diethanolamide, sodium dodecylbenzenesulfonate The mass ratio is 0.5:1:1) 60g, cosolvent 40g, xypurine gum release agent 2g, iron ore powder weighting agent 475g; Its preparation method is:

[0027] Weigh the surfactant and co-solvent and place them in a beaker, stir them evenly with a glass rod to form the oil displacement cleaning liquid base liquid; take water from the slurry cup, add Cypurine gum release agent under the condition of variable speed stirring (not more than 1200rpm) to form Spacer: Add iron ore powder weighting agent to form a weighted spacer under variable speed stirring conditions (not greater than 2000rpm); add the prepared oil displacement cleaning liquid base liquid to the weigh...

Embodiment 2

[0035] The invention provides a high-efficiency oil-displacement cleaning fluid suitable for use in an oil-based drilling fluid environment, comprising the following components: 500ml of water, surfactants (polysorbate, coconut oil diethanolamide, sodium dodecylbenzenesulfonate The mass ratio is 1:1:1) 60g, cosolvent 35g, xypurine gum release agent 2g, iron ore powder weighting agent 500g; Its preparation method is the same as embodiment 1.

Embodiment 3

[0037] The invention provides a high-efficiency oil-displacement cleaning fluid suitable for use in an oil-based drilling fluid environment, comprising the following components: 500ml of water, surfactants (polysorbate, coconut oil diethanolamide, sodium dodecylbenzenesulfonate The mass ratio is 1:1:1.5) 70g, cosolvent 40g, xypurine gum release agent 3g, iron ore powder weighting agent 600g; Its preparation method is the same as embodiment 1.

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Abstract

The invention provides a high efficiency oil displacement cleaning fluid suitable for use in an oil-based drilling fluid environment. The high efficiency oil displacement cleaning fluid comprises thefollowing components by mass: 500 parts of water, 40-70 parts of a surfactant, 35-55 parts of a co-solvent, 2.0-3.0 parts of a separant, and 0-1000 parts of a weighting agent. The surfactant is formedby mixing of two or three of a non-ionic surfactant polysorbate, coconut oil diethanolamide and an anionic surfactant sodium dodecylbenzene sulfonate, and has a density of 1.00g / cm<3>-1.90g / cm<3>. The oil displacement cleaning fluid provided by the invention has good oil-based filter cake cleaning ability, has good compatibility with oil-based drilling fluid and cement slurry, can effectively remove oil-based filter cake on a well wall and casing wall, and improve the displacement efficiency in the cement injection process, thus improving the well cementation quality, and is a high-quality oil displacement cleaning fluid suitable for cement injection operation under an oil-based drilling fluid condition.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a high-efficiency oil-displacement cleaning fluid suitable for use in an oil-based drilling fluid environment. Background technique [0002] With the continuous exploration and development of deep oil and gas beds and unconventional oil and gas beds, the number of complex deep wells and shale gas wells has increased year by year, and the application of oil-based drilling fluids has become more and more extensive. The use of oil-based drilling fluid will make the well wall and casing surface oil-wet, which plays an important role in increasing the penetration rate and reducing the complexity of downhole operations. However, the main problems brought by oil-based drilling fluid to cementing are: difficulty in oil-based drilling fluid replacement and interface cleaning, poor rheological properties of mixing slurry, and serious decrease in mixing slurry strength. In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52E21B37/06
CPCC09K8/52E21B37/06
Inventor 刘俊君张家瑞屈勇何吉标卞江郝海洋周涛
Owner CHINA PETROCHEMICAL CORP