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Method of controlling production of excess water and aqueous fluids in oil and gas wells

A water-based fluid and water-soluble salt technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult recovery operations and increased operating costs.

Pending Publication Date: 2022-03-18
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to increased operating costs and difficulties in recovery operations

Method used

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  • Method of controlling production of excess water and aqueous fluids in oil and gas wells
  • Method of controlling production of excess water and aqueous fluids in oil and gas wells
  • Method of controlling production of excess water and aqueous fluids in oil and gas wells

Examples

Experimental program
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Effect test

example 1-

[0264] Example 1 - Preparation of active ionic polymer dispersants (first step (i))

[0265] The polymer dispersant was prepared according to the following procedure: 250.03 g of 2-acrylamide-2-methylpropanesulfonic acid sodium salt (50 wt %), 0.05 g of A1 (radical polymerization control agent, purchased from Solvay) and 250.11 g of deionized water were injected into a 1-liter reactor equipped with a mechanical stirrer, and the mixture was stirred at 200 rpm for 30 minutes to form a homogeneous solution. The solution was first bubbled with 800cc / min nitrogen for 40 minutes, then heated to 35°C, and then added 0.5g of 5wt% sodium persulfate (SPS) aqueous solution and 1.3g of 5wt% sodium formaldehyde sulfoxylate (NaFS ) aqueous solution. After every hour, the same amount of SPS and NaFS was added. After 3 hours, the resulting viscous solution was heated to 45-50°C and 0.5 g of a 10 wt% solution of 2,2'-azobis(2-methylpropionamide) dihydrochloride was added. After aging for 1...

example 2

[0266] Example 2 - Preparation of polymer emulsion (second step (ii))

[0267] 71.66 g of ammonium sulfate, 12.58 g of sodium sulfate, 0.05 g of EDTA, and 213.2 g of deionized water were injected into a 1 liter resin reactor and stirred for 15 minutes. Subsequently, 95.12 g of acrylamide (50 wt %), 8.6 g of glycerol, 53.09 g of sodium 2-acrylamide-2-methylpropanesulfonate (50 wt %) and 44.6 g of the polymer prepared in Example 1 were added Disperse and stir to form a homogeneous solution. The solution was sparged with 800 cc / min of nitrogen for 40 minutes, then heated to 40° C., followed by the addition of 0.75 g of a 10 wt % aqueous solution of 2,2′-azobis(2-methylpropionamide) dihydrochloride . After every 30 minutes, an equal amount of 2,2'-azobis(2-methylpropionamide) dihydrochloride was added. During the polymerization, the whole mixture became milky. After 3 hours, 3 g of 10 wt % 2,2'-azobis(2-methylpropionamide) dihydrochloride solution was added and aged for 1 hour...

example 3

[0268] Example 3 - Preparation of polymer emulsion (second step (ii))

[0269] 71.65 g of ammonium sulfate, 12.61 g of sodium sulfate, 0.05 g of EDTA, and 213.0 g of deionized water were injected into a 1 liter resin reactor and stirred for 15 minutes. Subsequently, 118.45 g of acrylamide (50 wt %), 4.3 g of glycerin, 29.59 g of sodium 2-acrylamide-2-methylpropanesulfonate (50 wt %) and 44.63 g of the polymer prepared in Example 1 were added Disperse and stir to form a homogeneous solution. The solution was sparged with 800 cc / min of nitrogen for 40 minutes, then heated to 40° C., followed by the addition of 0.75 g of a 10 wt % aqueous solution of 2,2′-azobis(2-methylpropionamide) dihydrochloride . After every 30 minutes, an equal amount of 2,2'-azobis(2-methylpropionamide) dihydrochloride was added. During the polymerization, the whole mixture became milky. After 3 hours, 3 g of 10 wt % 2,2'-azobis(2-methylpropionamide) dihydrochloride solution was added and aged for 1 ho...

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Abstract

Methods of modifying the permeability of subterranean formations for selectively reducing the excess production of water and aqueous fluids in oil and gas wells are provided, where the methods utilize an emulsion comprising a copolymer, typically prepared in an aqueous salt medium.

Description

technical field [0001] The present invention relates to compositions and methods for modifying the permeability of subterranean formations for the selective reduction of overproduction of water and aqueous fluids in oil and gas wells. The present invention utilizes an emulsion comprising: (a) a copolymer in an amount of 10 wt% to 30 wt%; (b) a water-soluble salt in an amount of 10 wt% to 50 wt%; (c) optionally, a polyol; ( d) Water as the remainder; weight percents are based on the total weight of the emulsion. Typically, the emulsions are prepared in an aqueous saline medium. Background technique [0002] The production of water and aqueous fluids from oil and gas wells is a common phenomenon. Water and aqueous fluids often coexist with oil or gas in the same or adjacent formations. During oil or gas recovery, water and aqueous fluids are often co-produced with the desired oil or gas, causing operational problems. As hydrocarbons are removed from producing wells, water ...

Claims

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Application Information

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IPC IPC(8): C08F120/54C09K8/02
CPCC08F120/54C09K8/5045C09K8/508C08F120/56C09K8/5083
Inventor 陈齐飞张志华程振兴A·拉比H·V·乐
Owner RHODIA OPERATIONS SAS