Emulsifying and flushing spacer fluid for improving cementing quality of oil-based drilling fluid and preparation method of emulsifying and flushing spacer fluid

A technology of oil-based drilling fluid and flushing spacer fluid, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of inability to efficiently remove filter cake on the wellbore wall, unable to meet the needs of cementing, and single role of spacer fluid, etc. problems, achieve good interface flushing and wetting reversal capabilities, improve displacement efficiency, and solve the effects of high-temperature flushing performance degradation

Active Publication Date: 2015-10-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for oil-based drilling fluid cementing in China, the adjusted oil-based drilling fluid is often used as the flushing fluid, and the spacer fluid in use has a single function, poor effect and is not systematic
E

Method used

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  • Emulsifying and flushing spacer fluid for improving cementing quality of oil-based drilling fluid and preparation method of emulsifying and flushing spacer fluid
  • Emulsifying and flushing spacer fluid for improving cementing quality of oil-based drilling fluid and preparation method of emulsifying and flushing spacer fluid
  • Emulsifying and flushing spacer fluid for improving cementing quality of oil-based drilling fluid and preparation method of emulsifying and flushing spacer fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 100 parts of water in the slurry cup, add 5-10 parts of surfactant, add 0.05 parts of sodium carboxymethyl cellulose, stir at 8000r / min for 10min, then add 70-75 parts of base oil, and then add 8000r / min Stir for 5 minutes at a speed of / min to form an emulsion; put 100 parts of water in another slurry cup, add 8 parts of sodium bentonite, and stir for 3 hours; then add 0.6 parts of sodium humate, 0.5 parts of sodium carboxymethyl cellulose, and 0.5 1 part of sodium sulfomethyl gallate, stir evenly to adjust the performance to meet the requirements, and then put in 90 parts of barite powder; mix the above two solutions, add 0.05 part of tributyl phosphate and stir for 1 hour to obtain an emulsified flushing isolation solution with a density of 1.3g / cm3 .

Embodiment 2

[0031] Put 100 parts of water in the slurry cup, add 5-10 parts of surfactant, add 0.05 parts of sodium carboxymethyl cellulose, stir at 8000r / min for 10min, then add 70-75 parts of base oil, and then add 8000r / min / min speed and stir for 5 minutes to form an emulsion; put 100 parts of water in another slurry cup, add 10 parts of sodium bentonite, and stir for 3 hours; then add 2.0 parts of sodium humate, 1.3 parts of sodium carboxymethyl cellulose, 2.5 1 part of sodium sulfomethyl gallate, stir evenly to adjust the performance to meet the requirements, and then put 220 parts of barite powder; mix the above two solutions, add 0.05 part of tributyl phosphate and stir for 1 hour to obtain an emulsified flushing isolation solution with a density of 1.7g / cm3 .

Embodiment 3

[0033] Put 100 parts of water in the slurry cup, add 5-10 parts of surfactant, add 0.05 parts of sodium carboxymethyl cellulose, stir at 8000r / min for 10min, then add 70-75 parts of base oil, and then add 8000r / min / min speed and stir for 5 minutes to form an emulsion; put 100 parts of water in another slurry cup, add 15 parts of sodium bentonite, and stir for 3 hours; then add 3.0 parts of sodium humate, 1.5 parts of sodium carboxymethyl cellulose, 3.5 365 parts of barite powder after stirring evenly to adjust the performance to meet the requirements; mix the above two solutions, add 0.05 parts of tributyl phosphate and stir for 1 hour to obtain a density of 2.2g / cm 3 Emulsified flushing isolation fluid.

[0034] 2. Performance test of emulsified flushing spacer fluid to improve the cementing quality of oil-based drilling fluid

[0035] (1) Stability test of emulsion:

[0036] The preparation method of the emulsion is: put 100 parts of water in the slurry cup, add 5 to 10 p...

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PUM

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Abstract

The invention discloses an emulsifying and flushing spacer fluid for improving the cementing quality of an oil-based drilling fluid and a preparation method of the emulsifying and flushing spacer fluid. The spacer fluid is prepared from the following components in parts by weight: 200 parts of water, 5-10 parts of a surfactant, 70-75 parts of base oil, 4-15 parts of a suspension stabilizer, 0.2-3.0 parts of a fluid loss agent, 0.2-2.0 parts of a tackifier, 0.2-5.0 parts of a diluent, 80-400 parts of a weighting agent and 0.05 part of a defoamer, wherein the surfactant is prepared from cocoanut fatty acid diethanolamide CDEA and alkyl glycoside APG in a weight ratio of 1: 2. The emulsifying and flushing spacer fluid which has an emulsifying structure with permeating, dissolving, volume-increasing, carrying functions and the like has a preferable flushing capacity to the oil-based drilling fluid and mud cakes adhered to a casing wall. The surfacant molecules in the spacer fluid can be adsorbed on the surfaces of a casing and a well wall to improve the interfacial wettability, so that cement slurry and the casing and the well wall are better contacted and cemented, and therefore, the first and second interfacial cementation qualities for well cementation are improved.

Description

technical field [0001] The invention relates to an emulsified flushing spacer fluid and a preparation method thereof for improving the bonding strength of the cementing primary and secondary interfaces and the cementing quality under oil-based drilling fluid drilling conditions. Background technique [0002] Due to the oil-based drilling fluid has stable performance and strong anti-pollution ability, it can inhibit the water absorption and expansion of clay minerals in shale and other reservoirs, which is conducive to maintaining the stability of the wellbore wall. The liquid has been widely used in complex formations such as mud shale and salt-gypsum layers, and in special drilling techniques such as extended-reach wells and high-temperature deep wells. However, the oil-based drilling fluid has high viscosity and strong adhesion, which makes it difficult to flush the casing and the well wall, so that there is a certain thickness of uncurable layer between the cement slurry ...

Claims

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Application Information

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IPC IPC(8): C09K8/40
CPCC09K8/40
Inventor 李早元柳洪华郭小阳程小伟张兴国李明刘健辜涛黄盛欧红娟
Owner SOUTHWEST PETROLEUM UNIV
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