High-temperature-resistant oil-based drilling fluid shear strength improving agent as well as preparation method and application thereof

An oil-based drilling fluid and cutting agent technology, applied in chemical instruments and methods, earthwork drilling, wellbore flushing, etc., can solve the problems of easy sedimentation of drilling fluid, unsmooth drilling, poor suspension stability, etc. Excellent rheology and sedimentation stability, excellent cutting effect, small viscosity change effect

Pending Publication Date: 2021-09-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scholars at home and abroad have invented oil-based shear-lifting agents. Although they have a good shear-lifting effect, they generally have poor shear force and poor suspension stability, and the drilling fluid is prone to subsidence when it is not in use; Rock-carrying performance is poor, often leading to poor drilling

Method used

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  • High-temperature-resistant oil-based drilling fluid shear strength improving agent as well as preparation method and application thereof
  • High-temperature-resistant oil-based drilling fluid shear strength improving agent as well as preparation method and application thereof
  • High-temperature-resistant oil-based drilling fluid shear strength improving agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: oil-based drilling fluid cutting agent 1#

[0035] 1) Take 80ml of deionized water in a beaker, add 5g of SDBS, emulsify at 2000r / min for 10min, add 10g of styrene and 30g of isoprene, stir at 2000r / min for 20min, then transfer to a high temperature and high pressure reactor , keep the pressure at 4.5MPa.

[0036] 2) Add 0.025g of ammonium persulfate dropwise to the reaction kettle, under the condition of 80°C, the stirring speed is 300r / min, react for 3h, add 0.12g of dodecanethiol to terminate the reaction.

[0037] 3) Keeping the pressure constant, reduce the temperature of the product in step 2) to 70°C, blow in nitrogen gas for 20 minutes, discharge excess gaseous diene monomers, add 10ml of itaconic acid solution containing 3g to it, and use a mass fraction of 20 % sodium hydroxide solution to adjust the pH to 7, 0.025BPO was added dropwise, the stirring speed was 300 r / min, and the reaction was carried out for 2 hours.

[0038] 4) Add 5g of N-meth...

Embodiment 2

[0040] Embodiment 2: oil-based drilling fluid cutting agent 2#

[0041]1) Take 80ml deionized water in a beaker, add 2.5g SDBS and 2.5g2A1, emulsify at 2000r / min for 10min, add 10g styrene and 30g isoprene, stir at 2000r / min for 20min, then transfer to In the high temperature and high pressure reactor, keep the pressure at 4.5MPa.

[0042] 2) Add 0.025g of ammonium persulfate dropwise to the reaction kettle, under the condition of 80°C, the stirring speed is 300r / min, react for 3h, add 0.12g of dodecanethiol to terminate the reaction.

[0043] 3) Keeping the pressure constant, reduce the temperature of the product in step 2) to 70°C, blow in nitrogen gas for 20 minutes, discharge excess gaseous diene monomers, add 10ml of itaconic acid solution containing 3g to it, and use a mass fraction of 20 % sodium hydroxide solution to adjust the pH to 7, 0.025BPO was added dropwise, the stirring speed was 300 r / min, and the reaction was carried out for 2 hours.

[0044] 4) Add 5g of N...

Embodiment 3

[0046] Embodiment 3: oil-based drilling fluid cutting agent 3#

[0047] 1) Take 80ml of deionized water in a beaker, add 5g of SDBS, emulsify at 2000r / min for 10min, then transfer to a high temperature and high pressure reactor, add 10g of styrene, stir at 2000r / min for 20min, then transfer to high temperature and high pressure In the reactor, inject 30g of butadiene gas into the reactor, pressurize and keep 4.5MPa to keep it in a liquid state.

[0048] 2) Add 0.025g of ammonium persulfate dropwise to the reaction kettle, under the condition of 80°C, the stirring speed is 300r / min, react for 3h, add 0.12g of dodecanethiol to terminate the reaction.

[0049] 3) Keeping the pressure constant, reduce the temperature of the product in step 2 to 70°C, feed nitrogen gas for 20 minutes, discharge excess gaseous diene monomers, add 10ml of itaconic acid solution containing 3g, and use a mass fraction of 20% The sodium hydroxide solution was adjusted to PH=7, 0.025BPO was added dropwi...

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PUM

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Abstract

The invention provides a preparation method of a high-temperature-resistant oil-based drilling fluid shear strength improving agent, which comprises the following steps: 1) emulsifying an emulsifier aqueous solution, adding a high-temperature-resistant monomer and a diene monomer, uniformly mixing, and transferring into a high-temperature and high-pressure reaction kettle; (2) dropwise adding an initiator into the high-temperature and high-pressure reaction kettle under the pressure of 4.5 MPa, stirring and reacting the mixture at a low speed under the condition of 80-110 DEG C, and then adding a reaction terminator to obtain a first product; 3) keeping the pressure unchanged, reducing the temperature of the first product to 60-80 DEG C, introducing inert gas for 20 minutes to discharge redundant gaseous diene monomers, adding carboxylic acid monomers, dropwise adding an initiator, and stirring the mixture at a low speed to react for 2-3 hours; and 4) adding a nitrogen-containing functional monomer, and carrying out low-speed stirring reaction at the temperature of 60-80 DEG C, thereby obtaining the product. The invention also provides the oil-based drilling fluid shear strength improving agent and application thereof. The oil-based drilling fluid shear strength improving agent can resist the high temperature of 240 DEG C; besides, even in a high-temperature environment, the cutting-improving effect is still achieved.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a block-structured anti-high temperature oil-based drilling fluid cutting agent and its preparation method and application. Background technique [0002] In recent years, with the continuous development of drilling technology in my country, more and more technical problems are faced by oil and gas exploration, such as: ultra-deep high-temperature and high-pressure wells, extended-reach horizontal wells and water-sensitive formations and other complex formations . Oil-based drilling fluids are widely used in the complex formations mentioned above. Oil-based drilling fluids have some advantages that water-based drilling fluids cannot compare to, such as: excellent lubricity, strong temperature resistance, strong inhibition, less damage to reservoirs, wide range of density adaptability, high temperature The stability can be maintained in the state and the drilling fluid can be rec...

Claims

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Application Information

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IPC IPC(8): C08F279/02C08F222/02C08F8/30C09K8/035C09K8/32E21B21/00
CPCC08F279/02C08F8/30C09K8/035C09K8/32E21B21/00C08F222/02
Inventor 李茂孙金声黄贤斌姚如钢张现斌吕开河刘峰报白英睿刘敬平王金堂
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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