Tackifying and filtrate reducing agent for low soil phase and high density drilling fluid, and preparation method thereof

A fluid loss additive, high-density technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of reduced drilling fluid viscosity and shear force, inability to meet drilling needs, and reduced ability to carry cuttings, etc. Achieve the effect of reducing fluid loss, improving wellbore stability, and increasing liquid viscosity

Inactive Publication Date: 2015-11-04
山东得顺源石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction of soil phase leads to the decrease of viscosity and shear force of drilling fluid, and the decrease of cuttings carrying capacity, especially high-density drilling fluid needs to suspend a large amount of weighted materials, and if the rheology is not well controlled, complex situations such as settlement and sticking will occur
Biopolymers represented by xanthan gum and high-viscosity cellulose derivatives are currently widely used viscosity-increasing and shear-increasing agents, but their temperature resistance is generally poor and cannot meet the drilling needs of deep and ultra-deep wells

Method used

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  • Tackifying and filtrate reducing agent for low soil phase and high density drilling fluid, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Weigh 10.34g of acrylic acid, 3.45g of 2-acrylamido-2-methylpropanesulfonic acid, 31.02g of acrylamide, 3.45g of acrylonitrile and 1.72g of N-isopropylacrylamide in a three-necked flask;

[0019] (2) Add a certain amount of distilled water to dissolve the monomer, add 0.05g of silane coupling agent, stir evenly, adjust the pH to 6 with a measured sodium hydroxide aqueous solution, and then add distilled water to adjust the mass concentration of the system to 20%;

[0020] (3) At 30°C, after 30 minutes of driving oxygen with nitrogen, add 0.25 g of initiator ammonium persulfate and sodium bisulfite each, and react for 4 hours to obtain a viscous product;

[0021] (4) Dry and pulverize the viscous product to obtain the product fluid loss control agent.

Embodiment 2

[0023] (1) Weigh 5.0g of acrylic acid, 7.5g of 2-acrylamido-2-methylpropanesulfonic acid, 30.0g of acrylamide, 5.0g of acrylonitrile and 2.5g of N-isopropylacrylamide in a three-necked flask;

[0024] (2) Add a certain amount of distilled water to dissolve the monomer, add 0.125g of silane coupling agent, stir evenly, adjust the pH to 7 with a measured sodium hydroxide aqueous solution, and then add distilled water to adjust the system to a 30% aqueous solution;

[0025] (3) At 60°C, after driving oxygen with nitrogen for 30 minutes, add 0.1 g of initiator potassium persulfate and sodium bisulfite each, and react for 6 hours to obtain a viscous product;

[0026] (4) Dry and pulverize the viscous product to obtain the product fluid loss control agent.

Embodiment 3

[0028] (1) Weigh 14.29g of acrylic acid, 5.71g of 2-acrylamido-2-methylpropanesulfonic acid, 22.86g of acrylamide, 5.71g of acrylonitrile and 1.43g of N-isopropylacrylamide in a three-necked flask;

[0029] (2) Add a certain amount of distilled water to dissolve the monomer, add 0.15g of silane coupling agent, stir evenly, adjust the pH to 8 with a measured sodium hydroxide aqueous solution, and then add distilled water to adjust the system to a 40% aqueous solution;

[0030] (3) At 80°C, after 30 minutes of driving oxygen with nitrogen, add 0.15 g of initiator ammonium persulfate and sodium metabisulfite, and react for 8 hours to obtain a viscous product;

[0031] (4) Dry and pulverize the viscous product to obtain the product fluid loss control agent.

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Abstract

The invention provides a tackifying and filtrate reducing agent for a low soil phase and high density drilling fluid, and a preparation method thereof. The tackifying and filtrate reducing agent is a polymer formed through appropriate cross-linking polymerization of an olefin monomer and a silane coupling agent. The preparation method comprises the following steps: 1, mixing acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylonitrile, N-isopropylacrylamide and the coupling agent in water; 2, adjusting the pH value to 5-10; 3, introducing nitrogen to remove oxygen, adding an initiator at 20-90DEG C, and reacting for 1-10h to obtain a viscous product; and 4, drying the viscous product, and crushing. The tackifying and filtrate reducing agent for the low soil phase and high density drilling fluid has good temperature and salt resistance; the tackifying and filtrate reducing agent has good tackifying and shear strength improving effects in the low soil phase and high density drilling fluid, and is in favor of suspending a weighting material and carrying rock debris; and channels in mud cakes are plugged to improve the viscosity of a liquid phase, effectively reduce the filtrate loss and improve the wellbore stability.

Description

technical field [0001] The invention relates to a viscosity-increasing fluid loss reducer for low soil phase and high-density drilling fluid and a preparation method thereof, belonging to the technical field of drilling fluid treatment agents. Background technique [0002] Low soil phase drilling fluid has the characteristics of low soil phase content and coarsely dispersed clay particles, which can reduce the damage of soil phase particles to oil and gas channels, and improve reservoir permeability and oil and gas recovery efficiency. The decrease of soil phase leads to the decrease of viscosity and shear force of drilling fluid, and the decrease of cuttings-carrying ability. Especially, high-density drilling fluid needs to suspend a large amount of weighted materials. If rheological control is not good, complex situations such as subsidence and stuck pipe will occur. Biopolymers represented by xanthan gum and high-viscosity cellulose derivatives are currently widely used v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F220/44C08F220/54C09K8/035
Inventor 臧运刚王树永康乃静吕本正
Owner 山东得顺源石油科技有限公司
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