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Selective plugging agent for horizontal well and preparation method thereof

A water shutoff agent and selective technology, applied in the field of horizontal well selective water shutoff agent and its preparation, can solve the problems of narrow applicable environment range, poor selectivity, high price, etc., and achieve enhanced oil recovery and convenient synthesis and production , Improve the effect of spreading efficiency

Inactive Publication Date: 2011-06-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor selectivity, high price and narrow applicable environment range of existing horizontal well water shutoff agents, the present invention provides a selective water shutoff agent for horizontal wells, the parts by weight of each component are:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, Jidong G41-P1 well water blocking core experiment:

[0027] Add 4.75 parts of surface active intermediates into water, then add 6.75 parts of polymer monomers, and stir until uniform; after 4 hours of reaction at 50 ° C, add 0.925 parts of regulator, and then stir and react for 1 hour; Drying, pulverizing into particles of about 0.25mm, and screening to obtain the granular material of selective water plugging agent for horizontal wells; dissolving 0.75 part of the granular material of the selective water plugging agent in 99.25 parts of formation water uniformly to prepare a concentration of 0.75% Selective water blocking agent solution. In practical applications, the polymer monomer can be modified methylaminoethyl methacrylate; the surface active intermediate can be a pyridinium cationic compound quaternized with halogenated hydrocarbons, such as Regulators can be nitro compounds such as

[0028] Two cores No. 1 and No. 2 were filled, and the porosi...

Embodiment 2

[0030] Embodiment 2, Jidong G160-P6 well water blocking core experiment:

[0031] Add 5 parts of surface-active intermediates into water, then add 7 parts of polymer monomers, stir until uniform; add 0.925 parts of regulator after 4 hours of reaction at 50°C, and then stir and react for 1 hour; Drying, pulverizing into particles of about 0.25mm, and screening to obtain the granular material of the selective water plugging agent for horizontal wells; 1.0 part of the granular material of the selective water plugging agent is uniformly dissolved in 99 parts of formation water, and the concentration is 1%. Selective water blocking agent solution. In practical applications, the polymer monomer can be modified methylaminoethyl methacrylate; the surface active intermediate can be a pyridinium cationic compound quaternized with halogenated hydrocarbons, such as Regulators can be nitro compounds such as

[0032] Two cores No. 1 and No. 2 were filled, and the porosity of the sand-f...

Embodiment 3

[0034] Embodiment 3, Jidong M36-P3 well water blocking core experiment:

[0035] Add 5.25 parts of surface-active intermediates into water, then add 7.25 parts of polymer monomers, and stir until uniform; after 4.5 hours of reaction at 50°C, add 0.95 parts of regulator, and then stir and react for 1 hour; Drying, pulverizing into particles of about 0.25mm, and screening to obtain the granular material of the selective water plugging agent for horizontal wells; 1.25 parts of the granular material of the selective water plugging agent are uniformly dissolved in 98.75 parts of formation water, and the concentration is 1.25%. Selective water blocking agent solution. In practical applications, the polymer monomer can be modified methylaminoethyl methacrylate; the surface active intermediate can be a pyridinium cationic compound quaternized with halogenated hydrocarbons, such as Regulators can be nitro compounds such as

[0036] Two cores No. 1 and No. 2 were filled, and the po...

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Abstract

The invention discloses a selective plugging agent for a horizontal well and a preparation method thereof, which belong to the technical field of oil field chemistry. The plugging agent comprises the following components in part by weight: 6.50 to 7.50 parts of polymer monomer, 4.50 to 5.75 parts of surface active intermediate, 0.85 to 1.00 part of modifier, 85.75 to 88.15 parts of water. The method comprises the following steps of: adding the surface active intermediate into water, adding the polymer monomer and uniformly stirring; making the surface active intermediate react with the polymer monomer, adding the modifier and stirring to react; and drying a reaction product, grinding the dry product into particles, and screening to obtain selective plugging agent particles for the horizontal well. The plugging agent provided by the invention has the advantages of high oil and water selectivity, convenience in synthesizing and producing, stable chemical properties, high adaptability and simple construction technology; simultaneously, the sweep efficiency of the development of a high-water-cut old oilfield horizontal well is improved, the swept volume is expanded, and the petroleum recovery ratio is increased.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a selective water blocking agent for horizontal wells and a preparation method thereof. Background technique [0002] With the deepening of oilfield development, the number of horizontal wells continues to increase, the comprehensive water cut of horizontal well developed oilfields is increasing year by year, the water production of high-permeability oil layers is serious, and the production potential of low-permeability oil layers is difficult to realize. Effective water plugging technology for horizontal production wells needs to be developed urgently. Selective water plugging technology utilizes the characteristics of water plugging agents that have different chemical properties in oil and water environments to achieve the purpose of plugging water without plugging oil, or reducing oil plugging. In foreign countries, RPM phase permeability regulators are mostly used...

Claims

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Application Information

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IPC IPC(8): C09K8/42C08F120/34
Inventor 李宜坤胡频魏发林周燕熊春明刘玉章许寒冰张娜张建存
Owner PETROCHINA CO LTD
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