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Viscosity-increasing and shearing agent for oil-based drilling fluid, preparation method and application thereof

A technology of oil-based drilling fluid and shearing agent, applied in the field of drilling fluid, can solve the problems of high frictional resistance, low viscosity and shear force of drilling fluid, poor shear dilution of oil-based drilling fluid, etc.

Active Publication Date: 2021-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing commonly used viscosifying and shearing agents mainly include oil-based soil, oxidized asphalt and oil-based lignite, etc., and the oil-based drilling fluid obtained from these viscosifying and shearing agents has poor shear thinning properties, and the drilling fluid is Higher viscosity will be shown at high speed, which will lead to greater frictional resistance of drilling fluid during drilling. Therefore, a new type of viscosity-increasing and shearing agent has been developed to make oil-based drilling fluid have higher viscosity and shear force at low speed. , while having lower viscosity and shear force at high shear rates is of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In a 500mL four-neck flask equipped with a stirrer, heating device, thermometer, dropping funnel and dehydration device, add 250g (containing 0.8mol carboxyl group) polymeric acid, start stirring and feed nitrogen, then start heating, and heat to At 160°C, put 86.4g (containing 0.4mol amine) of D400 (the structural formula is NH 2 CH (CH 3 ) CH 2 (OR) m CH 2 NH 2 , where R is isopropyl, m is 6.1) put it into the dropping funnel, add D400 dropwise into the four-necked flask under stirring and at a temperature of 160°C, and continue to heat up to 180°C for reaction after the dropwise addition is completed , keep this temperature until no more water is produced, continue to react for 30 minutes, and then cool down to 50°C after the reaction, to obtain a viscosity-increasing and shear-increasing agent for oil-based drilling fluid.

Embodiment 2

[0014] In a 500mL four-neck flask equipped with a stirrer, heating device, thermometer, dropping funnel and dehydration device, add 250g (containing 0.8mol carboxyl group) polymeric acid, start stirring and feed nitrogen, then start heating, and heat to At 160°C, put 51.84g (containing 0.24mol amine) of D400 (the structural formula is NH 2 CH (CH 3 ) CH 2 (OR) m CH 2 NH 2 , where R is isopropyl, m is 6.1) put it into the dropping funnel, add D400 dropwise into the four-necked flask under stirring and at a temperature of 160°C, and continue to heat up to 180°C for reaction after the dropwise addition is completed , keep this temperature until no more water is produced, continue to react for 30 minutes, and then cool down to 50°C after the reaction, to obtain a viscosity-increasing and shear-increasing agent for oil-based drilling fluid.

Embodiment 3

[0016] Add 125g (containing 0.4mol carboxyl group) polymeric acid into the four-necked flask described in Example 1, start stirring and feed nitrogen, then start heating, when heated to 160°C, put 200g (containing 0.2mol amine group) D2000 (structural formula is NH 2 CH (CH 3 ) CH 2 (OR) m CH 2 NH 2 , where R is isopropyl, m is 33) put it into the dropping funnel, add D2000 dropwise into the four-necked flask under stirring and at a temperature of 160°C, and continue to heat up to 200°C for reaction after the dropwise addition is completed , keep this temperature until no more water is generated, continue to react for 30 minutes, and then cool down to 50°C after the reaction, to obtain a viscosity-increasing and shear-increasing agent for oil-based drilling fluid.

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PUM

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Abstract

The invention discloses a viscosity-increasing and shear-increasing agent for oil-based drilling fluid, a preparation method and application thereof. The thickening and cutting agent is formed by the reaction of poly fatty acid and amino-terminated polyether under the conditions of heating and nitrogen protection atmosphere, and the molar ratio of poly fatty acid and amino-terminated polyether is 1:03 to amine group 0.5 feed, the reaction temperature is controlled at 160-200 ° C, heated until no water is formed, and then continue to heat for 30 minutes to complete the reaction to obtain the viscosity-increasing and shearing agent. The viscosity-increasing and shear-increasing agent of the present application has good suspension performance in oil-based drilling fluid, and the dynamic-plastic ratio and shear force of the system are obviously improved.

Description

technical field [0001] The invention relates to a viscosity-increasing and shear-increasing agent for oil-based drilling fluids in the field of drilling fluids, a preparation method and application thereof. Background technique [0002] Oil-based drilling fluid has obvious advantages in stabilizing the wellbore, lubricating and preventing shale hydration, inhibiting shale hydration and expansion, formation slurry, and rapid drilling. means. There are also some problems in the oil-based drilling fluid system, mainly manifested in the small shear force of the system, and the shear force is one of the key rheological parameters determining the performance of oil-based drilling fluid, which directly affects the rock-carrying effect, barite settlement, Equivalent circulation density and suction pressure etc. Complex wells can only be successfully drilled if shear forces are properly controlled and maintained. Generally, the shear force of the drilling fluid system is increased...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/34C08G65/332C07C233/20C07C231/02
CPCC07C231/02C08G65/332C09K8/34C07C233/20
Inventor 王康袁俊秀杨智中封心领靳志超徐冬梅
Owner CHINA PETROLEUM & CHEM CORP
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