Tackifying and shear strength improving agent for oil-based drilling fluid, preparation method for tackifying and shear strength improving agent and use of tackifying and shear strength improving agent

A technology of oil-based drilling fluid and shear lifting agent, which is applied in the field of drilling fluid, and can solve the problems of poor shear dilution, low viscosity and shear force, and large frictional resistance of oil-based drilling fluid.

Active Publication Date: 2017-04-19
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 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.

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 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.

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PUM

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Abstract

The invention discloses a tackifying and shear strength improving agent for oil-based drilling fluid, a preparation method for the tackifying and shear strength improving agent and use of the tackifying and shear strength improving agent. The tackifying and shear strength improving agent is prepared through carrying out a reaction on polyfatty acid and amino-terminated polyether under the conditions of heating and nitrogen protection atmosphere. The method comprises the steps of charging the polyfatty acid and the amino-terminated polyether in accordance with the mole ratio of carboxyl groups to amino groups being 1: (0.3 to 0.5), controlling the reaction temperature to 160 DEG C to 200 DEG C, carrying out heating until no water is produced, and then, continuing to carry out heating for 30 minutes to complete the reaction, thereby obtaining the tackifying and shear strength improving agent. The tackifying and shear strength improving agent disclosed by the invention is good in suspension property in the oil-based drilling fluid, and the ratio of dynamic shear force to plastic viscosity and shearing force of a system are improved obviously.

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 Applications(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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