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Water control agent for oil well and preparation method thereof

A water control agent and oil well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of strong sensitivity, short water control period, high injection pressure, etc., and achieve easy control of reaction conditions, adsorption and Effect of low friction and good shear resistance

Inactive Publication Date: 2011-06-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of using low-permeability oilfields, there are mainly the following problems: (1) Low-permeability reservoirs have poor physical properties, strong sensitivity, and start-up pressure gradients, while polymers or cross-linked systems have high viscosity and injection pressures High, easy to block crude oil seepage channels and cause reservoir damage; (2) Wetting reversal technology has high construction costs, short water control period, and the effect is difficult to control; (3) Most of the research on relative permeability improvement systems at home and abroad focuses on high-permeability reservoirs Selective water shutoff and field or indoor test effect evaluation

Method used

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  • Water control agent for oil well and preparation method thereof
  • Water control agent for oil well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 40ml of kerosene, 3.2g of Span80 and 0.6g of methyl acrylate into a 250ml four-neck flask equipped with a stirrer, dropping funnel, nitrogen pipe, and thermometer. After the dissolution is complete, nitrogen is used to remove oxygen for 5 hours to prepare a continuous phase.

[0033] Put the beaker in the ice-water mixture, measure 60ml of deionized water and pour it into the beaker, weigh 0.3g of 2-acrylamido-2-methylpropanesulfonic acid into the beaker, stir until it is completely dissolved, and adjust the pH value 7-9, then weigh 11.1g of acrylamide and add it to the beaker and stir until it is completely dissolved, measure 0.9ml of 2% ammonium persulfate solution and add it to the beaker, stir to make it evenly mixed, and deoxygenate with nitrogen for 5 hours to prepare a dispersion Mutually.

[0034] Under the condition that the stirring speed is 1000-1200r / min, the dispersed phase is added dropwise to the continuous phase, and the dropwise addition is complete...

Embodiment 2

[0040]As described in Example 1, the difference is that 1.2ml of 2% ammonium persulfate solution was added, and 6ml of 0.1% sodium bisulfite solution was added to obtain a product yield of 72%, and the intrinsic viscosity of the product was 343ml / g. Elemental analysis shows that the mass percentages of hydrophobic groups and hydrophilic groups in the product are 3.0% and 7..2%, respectively.

Embodiment 3

[0042] As described in Example 1, the difference is that the reaction temperature is 50°C. The yield of the final product was 80%, and the intrinsic viscosity of the product was 843ml / g. Elemental analysis showed that the mass percentages of hydrophobic groups and hydrophilic groups in the product were 3.4% and 7.6%, respectively.

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Abstract

The invention relates to a water control agent for an oil well and a preparation method thereof. The method comprises the steps of: mixing sorbitan monooleate, a hydrophobic monomer and an oil phase solvent to form a continuous phase; adding ammonium persulfate serving as an oxidant into acrylamide and 2-acrylamido-2-methyl propane sulfonic acid serving as comonomers, and dissolving into water together to form a dispersed phase; adding the dispersed phase into the continuous phase to form inverse emulsion; and dripping a reducing agent, namely sodium hydrogen sulfite into the inverse emulsion step by step, and raising the temperature to initiate polymerization, wherein a generated terpolymer can be taken as the water control agent for the oil well and can also be taken as a water control fracturing thickener for the oil well. The product is simple in preparation technology; reaction conditions are easy to control; and the water control agent for the oil well is particularly suitable for water control and oil production increase of waterside or high-water-content and low-permeability oil reservoirs.

Description

technical field [0001] The invention relates to an oil well water control agent and a preparation method thereof, in particular to an oil well water control agent or a fracturing water control agent for near water or high water content and low permeability reservoirs. Background technique [0002] It has always been a difficult problem to implement water control or production stimulation measures and effectively control water production in near-water and high water-cut reservoirs. Production wells produce a large amount of water, which usually leads to a rapid decline in oil production and increased energy consumption for oil production. A large amount of water treatment increases production costs, and also causes other problems such as sand production, corrosion, and scaling. The well was forced to shut down early and stop production due to no economic value of exploitation. Since 1997, the United States has carried out fracturing stimulation measures for wells with a wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/88C08F220/58C08F220/56
Inventor 罗明良温庆志刘洪见贾自龙孙厚台刘佳林
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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