Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and cementing technology, which is applied in the field of oil and gas well cementing, can solve the problems of poor interface cementation quality and low flushing efficiency, and achieve the effects of reducing interfacial tension, increasing flushing capacity, and increasing interface area

Inactive Publication Date: 2016-03-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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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 cementing flushing fluid system suitable for oil-based drilling fluid and its preparation method in order to overcome the disadvantages of low flushing efficiency and poor interface cementation quality of existing cementing flushing fluids for oil-based drilling fluids

Method used

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  • Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof
  • Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof
  • Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Composition of a cementing flushing fluid system suitable for oil-based drilling fluids

[0029] A cementing flushing fluid system suitable for oil-based drilling fluid can be composed of the following substances, the mass parts of each substance are: 100 parts of clear water, 1 part of anionic surfactant sodium dodecylbenzene sulfonate, non-ionic surfactant Active agent fatty alcohol polyoxyethylene ether AEO-90.7 parts, co-surfactant n-butanol 0.7 parts, oil phase n-heptane 7 parts, saline phase potassium chloride aqueous solution 9 parts, polymer carboxymethyl hydroxyethyl cellulose 3 parts, 32 parts of weighting agent quartz sand, 2 parts of potassium chloride, the density of the washing liquid is 1.2g / cm 3 .

Embodiment 2

[0030] Embodiment 2: A kind of composition that is suitable for the cementing flushing fluid system of oil-based drilling fluid

[0031] A cementing flushing fluid system suitable for oil-based drilling fluid can be composed of the following substances, the mass parts of each substance are: 100 parts of clear water, 0.8 parts of anionic surfactant sodium dodecylsulfonate, nonionic surfactant Agent polyol ester Tween800.6 parts, co-surfactant propylene glycol butyl ether 0.8 parts, oil phase cyclohexane 6 parts, brine phase sodium chloride aqueous solution 8 parts, polymer polyvinyl alcohol 5 parts, weighting agent barite 94 1 part, 2 parts of sodium chloride, the density of the washing liquid is 1.7g / cm 3 .

Embodiment 3

[0032] Example 3: Compatible rheological evaluation of flushing fluid system

[0033] Taking the flushing fluid system of Example 1 as the test object, first prepare the flushing fluid, and then evaluate the compatible rheology according to the Petroleum and Natural Gas Industry Standard SY / T5374-2000 of the People's Republic of China "Methods for Using the Pre-fluid for Cementing in Oil and Gas Wells", and the drilling fluid / The flushing fluid is mixed according to the ratio of 95 / 5, 75 / 25, 50 / 50, 25 / 75, and 5 / 95, and the rheological properties are measured with a six-speed viscometer, and compared with the drilling fluid without flushing fluid, the test temperature 70°C. The oil-based drilling fluid formula used is: white oil + 1.5% VG-69 organic soil + 0.5% LCR-01D main emulsifier + 3% fluid loss reducer + 25% water + 5% calcium chloride + 0.5% auxiliary Emulsifier, the drilling fluid density is 1.30g / cm 3 . The test results are shown in Table 1.

[0034] Table 1 Compa...

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Abstract

A well cementation flushing liquid system suitable for an oil-based drilling fluid and a preparation method thereof. The invention mainly solves the defects of low flushing efficiency, poor wetting conversion capability and poor interface cementing quality in the flushing liquids in the prior art. The flushing liquid system comprises the following components, by weight: 100 parts of clear water, 0.8-1.2 parts of an anionic surfactant, 0.6-0.8 parts of a nonionic surfactant, 0.7-1.0 part of a cosurfactant, 6.0-10.0 parts of an oil phase, 8.0-12.0 parts of a salt water phase, 0.15-5.0 parts of a polymer, 0.0-150 parts of a weighting agent and 1.0-2.5 parts of salt. The flushing liquid system is adjustable in density within 1.01-1.90 g/cm<3> and is 20-130 DEG C in available temperature range. The flushing liquid system can quickly remove residual oil-based drilling fluid, is strong in wetting conversion capability, ensures cementation between cement rings and an annular space, and is wide in application prospect.

Description

technical field [0001] The invention relates to the field of oil and gas well cementing, in particular to a cementing flushing fluid system suitable for oil-based drilling fluid and a preparation method, especially suitable for flushing the oil-based drilling fluid before cementing to improve the cementation quality of the cementing interface. Background technique [0002] Oil-based drilling fluid has strong anti-pollution ability, stable performance, strong inhibition and good lubricity, which is conducive to maintaining the stability of the borehole wall and can protect the oil and gas layers to the greatest extent. The application in special drilling construction such as displacement wells is increasing year by year. However, in the cementing of oil and gas wells, the oil-based drilling fluid will have an adverse effect on the cementing quality: the oil-based drilling fluid has high viscosity and strong adhesion, which makes it difficult to flush the casing and the well w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524
CPCC09K8/524
Inventor 王成文孟仁洲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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