Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid as well as preparation method and application of tackifier

A water-based drilling fluid, an environmentally friendly technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as insufficient high temperature stability, achieve excellent temperature and salt resistance, increase steric resistance, The effect of increasing thermal stability

Active Publication Date: 2022-07-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses different alkenyl-containing monomers as main raw materials to prepare a water-soluble high-temperature-resistant polymer tackifier with a certain network structure through the inverse emulsion polymerization method. The obtained tackifier is resistant to water in a high-temperature environment of 180°C The base drilling fluid has excellent viscosity-increasing performance and is non-toxic and easy to biodegrade, which overcomes the shortcomings of insufficient high-temperature stability of existing water-based drilling fluid polymer viscosifiers

Method used

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  • Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid as well as preparation method and application of tackifier
  • Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid as well as preparation method and application of tackifier
  • Environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid as well as preparation method and application of tackifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of an environment-friendly high-temperature and salt-resistant tackifier for water-based drilling fluid, comprising the following steps:

[0041] (1) 5g N,N-dimethylacrylamide, 17g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3g methacryloyloxyethyltrimethyl chloride were successively added to a 250mL beaker Ammonium chloride (DMC) and 100 mL of water were used for stirring at a stirring speed of 300 r / min for 20 min using a magnetic stirrer to obtain aqueous phase A.

[0042] (2) Add 0.1g of N-methylol acrylamide, 1g of emulsifier Tween80 and 100mL of white oil to a 250mL beaker, then, weigh 4.25g of butyl acrylate and add it to the beaker, use a shear emulsifier at 2000r / min The oil phase B was obtained by shearing and emulsification at a stirring speed for 20 min.

[0043] (3) Mix the water phase A obtained in step (1) and the oil phase B obtained in step (2), use a shear emulsifier to continue emulsification at a stirring speed of 2000 r / m...

Embodiment 2

[0045] A preparation method of an environment-friendly high-temperature and salt-resistant tackifier for water-based drilling fluid, comprising the following steps:

[0046] (1) 10g N,N-dimethylacrylamide, 17g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3g methacryloyloxyethyltrimethyl chloride were successively added to a 250mL beaker Ammonium chloride (DMC) and 100 mL of water were used for stirring at a stirring speed of 300 r / min for 20 min using a magnetic stirrer to obtain aqueous phase A.

[0047] (2) Add 0.1g of N-methylol acrylamide, 1g of emulsifier Tween80 and 100mL of white oil to a 250mL beaker, then, weigh 4.25g of butyl acrylate and add it to the beaker, use a shear emulsifier at 2000r / min The oil phase B was obtained by shearing and emulsification at a stirring speed for 20 min.

[0048] (3) Mix the water phase A obtained in step (1) and the oil phase B obtained in step (2), use a shear emulsifier to continue emulsification at a stirring speed of 2000 r / ...

Embodiment 3

[0050] A preparation method of an environment-friendly high-temperature and salt-resistant tackifier for water-based drilling fluid, comprising the following steps:

[0051] (1) 5g acrylamide, 22g 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3g methacryloyloxyethyltrimethylammonium chloride (DMC) and 100mL were sequentially added to a 250mL beaker water, using a magnetic stirrer to stir at a stirring speed of 300 r / min for 20 min to obtain water phase A.

[0052] (2) Add 0.1g of N-methylol acrylamide, 1g of emulsifier Tween80 and 100mL of white oil to a 250mL beaker, then, weigh 4.25g of butyl acrylate and add it to the beaker, use a shear emulsifier at 2000r / min The oil phase B was obtained by shearing and emulsification at a stirring speed for 20 min.

[0053] (3) Mix the water phase A obtained in step (1) and the oil phase B obtained in step (2), use a shear emulsifier to continue emulsification at a stirring speed of 2000 r / min for 15 min, and use a 40% NaOH solution...

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Abstract

The invention provides an environment-friendly high-temperature-resistant salt-resistant tackifier for water-based drilling fluid as well as a preparation method and application of the environment-friendly high-temperature-resistant salt-resistant tackifier. The preparation method comprises the following steps: adding an alkene monomer, an anionic monomer and a cationic monomer into water, and uniformly stirring to obtain a water phase A; adding a crosslinking monomer, an emulsifier and an ester monomer into white oil, and emulsifying to obtain an oil phase B; mixing the water phase A and the oil phase B, emulsifying, and adjusting the pH value of the system to 6-9 to obtain an emulsion; adding an initiator aqueous solution in a nitrogen atmosphere for reaction; and after the reaction is completed, precipitating by using acetone, filtering, washing and drying to obtain the product. The water-soluble high-temperature-resistant polymer tackifier with a certain network structure is prepared through an inverse emulsion polymerization method, the obtained tackifier has excellent tackifying performance on water-based drilling fluid in a 180-DEG C high-temperature environment, is non-toxic and is easy to biodegrade, and the defect that an existing water-based drilling fluid polymer tackifier is insufficient in high-temperature stability is overcome.

Description

technical field [0001] The invention relates to an environment-friendly high-temperature-resistant and salt-resistant viscosity-increasing agent for water-based drilling fluid, a preparation method and application thereof, and belongs to the field of oilfield chemistry of the petroleum industry. Background technique [0002] With the continuous growth of energy demand in my country's economic development, the exploration and development of oil and natural gas has begun to develop from the middle and shallow layers to the deep layers. The bottom hole temperature in deep formations is high, and salt-gypsum layers are generally drilled, which puts forward higher and higher requirements for the temperature resistance and salt resistance of drilling fluids. Water-based drilling fluid is one of the key technologies for high-temperature formation drilling. However, when drilling in deep reservoirs, with the increase of formation temperature, various components in the drilling fluid...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/54C08F220/34C08F220/18C08F2/32C09K8/035
CPCC08F220/585C08F2/32C09K8/035C08F220/54C08F220/34C08F220/58C08F220/1804
Inventor孙金声李海潮黄贤斌吕开河黎剑白英睿
OwnerCHINA UNIV OF PETROLEUM (EAST CHINA)