A microemulsion type lubricant used for a drilling fluid and a preparing method thereof

A lubricant and drilling fluid technology, applied in the field of drilling engineering chemical additives, can solve the problems of high lubricant cost, poor compatibility of water-based drilling fluid, and no environmental performance evaluation involved

Inactive Publication Date: 2017-05-10
SINOPEC SSC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages or deficiencies of these technologies are: there is no research on microemulsion lubricants for drilling fluids in the petroleum industry; the cost of lubri

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First pour 38% water into the reactor, then slowly add sodium dodecylbenzenesulfonate and Span 80 into the reactor at a stirring speed of 2000r / min-3000r / min in a ratio of 5:2, the total After mixing evenly, slowly add 2% sodium chloride, after completely dissolving, add 20% n-butanol and 30% mineral oil, and let stand for 5-10 hours.

Embodiment 2

[0019] First pour 41% water into the reactor, then slowly add sodium lauryl sulfate and Span 80 into the reactor at a stirring speed of 2000r / min-3000r / min in a ratio of 4:1, the total amount is 15 %, after mixing evenly, slowly add 4% potassium chloride, but after it is completely dissolved, add 10% n-butanol and 30% refined waste oil, and let stand for 5-10 hours.

Embodiment 3

[0021] First pour water into the reactor, then slowly add alkyl polyoxyethylene ether sodium sulfate and Span 80 into the reactor at a stirring speed of 2000r / min-3000r / min in a ratio of 4:1, the total amount is 15 %, after mixing evenly, slowly add 4% ammonium chloride, but after it is completely dissolved, add 10% n-butanol and 10% refined waste oil, and let stand for 5-10 hours.

[0022] Refined waste oil is heated and filtered, and then 15% by weight of calcium carbonate and 10% by weight of brine are added to it, stirred at a low speed, left for 3-8 hours, then added with activated clay for decolorization, and then filtered. Waste oil.

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Abstract

The invention relates to a microemulsion type lubricant used for a drilling fluid and a preparing method thereof. The lubricant includes mineral oil or refined gutter oil, a surfactant, an inorganic salt, n-butanol and water. The method includes firstly adding water into a reaction kettle, slowly adding the surfactant into the reaction kettle with the stirring speed being 2000-3000 r/min; after the water and the surfactant are fully mixed, slowly adding the inorganic salt; after the inorganic salt is fully dissolved, adding the n-butanol and the mineral oil or refined gutter oil; and allowing the mixture to stand for 5-10 h. The lubricant and the method are advantageous in that industrial production of the lubricant can be achieved and the environment protection problem of the gutter oil is solved; the lubricant has good compatibleness with a water-based drilling fluid, has low influences on rheological properties of the drilling fluid, and can effectively reduce the frictional resistance coefficient and the mud cake adhesion coefficient; and by adding the lubricant into the drilling fluid, the mud cake adhesion coefficient can be effectively reduced. Experiment measurement shows that the highest reduction rate of the mud cake adhesion coefficient is 52.3%.

Description

technical field [0001] The invention relates to a microemulsion lubricant for drilling fluid in the field of chemical additives for drilling engineering, in particular to a microemulsion lubricant with stable thermodynamic performance for water-based drilling fluid and a preparation method thereof. Background technique [0002] Water-based drilling fluid is the most widely used type of drilling fluid, and has always occupied a dominant position in actual field applications. However, in the construction process of horizontal wells and highly deviated wells, its friction coefficient is difficult to control, so it is necessary to develop efficient Lubricants for stable water-based drilling fluids are necessary. [0003] At present, a lot of research work has been done on improving the lubricity of drilling fluids in China, but there is a lack of research on microemulsion lubricants with thermodynamic stability systems that can be widely used in a wide temperature range. In "Re...

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/34
Inventor 夏晔蓝强黄志远王俊涛张敬辉陈健于雷周晓蕾李卉
Owner SINOPEC SSC
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