Oil-in-water drilling fluid with vegetable oil as internal phase and preparation method of oil-in-water drilling fluid

A technology of oil-in-water drilling fluid and vegetable oil, which is applied in the field of petroleum exploration, can solve the problems of high biotoxicity and difficult biodegradation of mineral oil, and achieve the effects of ultra-low treatment cost, high permeability recovery value, and less dosage

Active Publication Date: 2015-05-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil phase mainly adopts mineral oil with high flash point, high fire point and high aniline point, such as diesel oil, white oil, crude oil, etc., but mineral oil has high biological toxicity and is difficult to biodegrade. The more stringent, the more urgent the demand for vegetable oil-based oil-in-water systems that can be directly discharged

Method used

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  • Oil-in-water drilling fluid with vegetable oil as internal phase and preparation method of oil-in-water drilling fluid
  • Oil-in-water drilling fluid with vegetable oil as internal phase and preparation method of oil-in-water drilling fluid
  • Oil-in-water drilling fluid with vegetable oil as internal phase and preparation method of oil-in-water drilling fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing oil-in-water drilling fluid with vegetable oil as the internal phase, and the specific steps are as follows:

[0035] The oil-water volume ratio is 60 / 40, first measure 240mL coconut oil, add 12g sodium dodecylbenzenesulfonate, 7.2g alkanolamide (RCON(CH 2 CH 2 Oh) 2 , where R is C 12 Alkyl), 4g of oxidized pitch, stirred at a high speed of 11000r / min for 30 minutes to obtain an oil phase.

[0036] Measure 160mL of clear water, add 6g carboxymethyl starch, 1g NaOH, 0.4g xanthan gum respectively, stir at 11000r / min at high speed for 20 minutes, then add 16g sulfomethyl phenolic resin in turn, and stir at 11000r / min at high speed After 20 minutes, an aqueous phase was obtained.

[0037] Finally, slowly add the oil phase to the water phase while stirring at high speed, and continue to stir at a high speed of 11000r / min for 30 minutes, so that the emulsion is completely emulsified, the formed interface film is stable, and ...

Embodiment 2

[0039] This embodiment provides a method for preparing oil-in-water drilling fluid with vegetable oil as the internal phase, and the specific steps are as follows:

[0040] The oil-water volume ratio is 50 / 50, first measure 200mL soybean oil, add 10g tween-60 (Shanghai Hushi Chemical Co., Ltd.), 6gOP-4 (Tianjin Xiongguan Technology Development Co., Ltd.), 6g natural asphalt in turn, at 11000r / Stir at high speed for 30 minutes under min to obtain an oil phase.

[0041] Measure 200mL of clear water, add 5g of hydroxyethyl starch, 1g of NaOH, and 0.6g of bentonite respectively, stir at a high speed of 11000r / min for 20 minutes, then add 14g of sulfonated lignite resin in turn, and stir at a high speed of 11000r / min for 20 minutes, An aqueous phase is obtained.

[0042] Finally, slowly add the oil phase to the water phase while stirring at high speed, and continue to stir at a high speed of 11000r / min for 30 minutes, so that the emulsion is completely emulsified, the formed inte...

Embodiment 3

[0044] This embodiment provides a method for preparing oil-in-water drilling fluid with vegetable oil as the internal phase, and the specific steps are as follows:

[0045] The volume ratio of oil to water is 40 / 60, first measure 160mL rapeseed oil, then add 8g cetyltrimethylammonium bromide, 4.8g oleic acid diethanolamide, 14g humic acid amide in sequence, at 11000r / min at high speed Stir for 25 minutes to obtain an oily phase.

[0046] Then measure 240mL of clear water, add 4g hydroxyethyl cellulose, 1.2g NaOH, 0.4g xanthan gum respectively, stir at a high speed of 11000r / min for 20 minutes, then add 6g of sulfonated asphalt in turn, and stir at a high speed of 11000r / min Stir for 20 minutes to obtain an aqueous phase.

[0047] Finally, slowly add the oil phase to the water phase while stirring at high speed, and continue to stir at a high speed of 11000r / min for 30 minutes, so that the emulsion is completely emulsified, the formed interface film is stable, and the emulsion...

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Abstract

The invention provides an oil-in-water drilling fluid with vegetable oil as an internal phase and a preparation method of the oil-in-water drilling fluid. The drilling fluid is prepared from the vegetable oil, water and a treating agent, wherein the volume ratio of the vegetable oil and water is 40:60 to 60:40; the treating agent comprises a main emulsifier, an auxiliary emulsifier, a filtrate loss reducer I, a thickening agent, NaOH, a thickening and shear strength improving agent, and a filtrate loss reducer II; based on 100 ml of vegetable oil and water, the content of the main emulsifier is 2-3.5 g, the content of the auxiliary emulsifier is 1-2.5 g, the content of the filtrate loss reducer I is 1-3.5 g, the content of the thickening agent is 1-1.5 g, the content of NaOH is 0.25-0.3 g, the content of the thickening and shear strength improving agent is 0.1-0.2 g, and the content of the filtrate loss reducer II is 1.5-4 g. The oil-in-water drilling fluid with the vegetable oil as the internal phase, provided by the invention, is stable in performance, high in drilling cutting resistance and clay pollution capacity, safe and environment-friendly, and can be directly discharged.

Description

technical field [0001] The invention relates to an oil-in-water drilling fluid with vegetable oil as an internal phase and a preparation method thereof, belonging to the field of petroleum exploration. Background technique [0002] Drilling fluid refers to the circulating working fluid used in the drilling process. The oil-in-water drilling fluid system is an oil-in-water emulsion with water as the continuous phase and oil as the dispersed phase. It is mainly used to solve reservoir protection problems with low porosity and low permeability, well-developed fractures and caves, and low formation pressure coefficient Deep well underbalanced technical problems. The oil phase mainly adopts mineral oil with high flash point, high fire point and high aniline point, such as diesel oil, white oil, crude oil, etc., but mineral oil has high biological toxicity and is difficult to biodegrade. The more stringent, the more urgent the demand for vegetable oil-based oil-in-water systems ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/28
CPCC09K8/265C09K8/28
Inventor 张洁赵志良王双威李丛俊刘继亮李龙张志磊李爽杨峥冯杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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