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Emulsifier with oil base for drilling well liquid

An oil-based drilling fluid and emulsifier technology, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in cleaning oil-containing drilling cuttings

Inactive Publication Date: 2006-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of drilling fluid belongs to oil-based drilling fluid, and the conventional water-in-oil emulsifier is used, which has the problem of difficult cleaning of oily cuttings
Existing other types of emulsifiers cannot effectively solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The oil-based drilling fluid emulsifier of the present invention includes emulsifier C, and one or two of emulsifiers A and B. Among them, emulsifier A is polyolefin carboxylate, emulsifier B is polyolefin carboxylate polyoxyethylene ether, and emulsifier C is polyolefin carboxylate polyoxyethylene ether sulfonate or polyolefin carboxylate polyoxyethylene ether phosphate After selecting a suitable emulsifier, simply mixing to obtain the composite emulsifier of the present invention. The viscosity of the emulsifier of the present invention is 20~3000 (100℃mm 2 / s), the amount of emulsifier in the oil-based drilling fluid ranges from 10 to 60 w%, preferably 30 to 50 w%.

[0008] Emulsifier A is obtained by esterification reaction of polyolefin carboxylic acid or polyolefin acid anhydride and hydroxy compound. The optional hydroxy compound is monohydric alcohol, polyhydric alcohol, alcohol amine, etc., such as HO-(CH 2 CH 2 O) n -H where n=1-80, preferably n=5-10, monoethanola...

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PUM

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Abstract

The invention relates to a variable-phase emulsifier, especially used in drilling fluid, compounded of two or three kinds of emulsifiers with VB value less than 1, easy to form water-in-oil emulsion and under alkali condition, the VB value is greater than 1 so that it is easy to form oil-in-water emulsion. It can generate water-in-oil emulsion because the VB value is less than 1. It can form water-in-oil emulsion as used in the drilling fluid and thus has all the advantages of oil-base drilling fluid, and can convert to oil-in-water emulsion through alkali processing, thus having the easy-to-wash advantage of water-base drilling fluid, and can also be used in other proper industry.

Description

Technical field [0001] The invention relates to an emulsifier, particularly an emulsifier for oil-based drilling fluids. Background technique [0002] Emulsifiers are widely used in many fields. Drilling fluids in the drilling industry need to use emulsifiers. Drilling fluids can be divided into many types, including water-based drilling fluids, oil-based drilling fluids and gas drilling fluids. Commonly used is water-based drilling fluid, which has the characteristics of low price and low pollution. The advantages of oil-based drilling fluids are: excellent hole stability, thin filter cake formed by low fluid loss of drilling fluid, excellent drilling lubricity, and protection of oil and gas formations. The cost of oil-based drilling fluid is higher than that of water-based drilling fluid, but if the formation is shale, rock salt, gypsum or high-temperature formation, oil-based drilling fluid is the only choice. In addition to the high cost of oil-based drilling fluids, oil-bear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36
Inventor 王鼎聪
Owner CHINA PETROLEUM & CHEM CORP