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Water shutoff agent applicable to high-temperature high-salt oil reservoir water shutoff profile control

A high-temperature, high-salt, water-plugging and profile-modifying technology is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve problems such as low strength, limited field application, and short gelation time, and achieves good stability and high productivity. The effect of long glue time and high gel strength

Active Publication Date: 2015-01-21
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation is convenient and the price is low, its disadvantages are low strength, short gelation time at high temperature, and limited field application

Method used

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  • Water shutoff agent applicable to high-temperature high-salt oil reservoir water shutoff profile control
  • Water shutoff agent applicable to high-temperature high-salt oil reservoir water shutoff profile control
  • Water shutoff agent applicable to high-temperature high-salt oil reservoir water shutoff profile control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 2.5g of sulfonated tannin extract, 1g of urotropine, 1g of hydroquinone, 1g of water glass and 0.03g of non-ionic polyacrylamide in 44.47g of clear water while stirring, and stir to obtain a water blocking agent into a gel. . Its composition by mass fraction is 5% sulfonated tannin extract, 2.0% urotropine, 2.0% hydroquinone, 2.0% water glass, 0.06% nonionic polyacrylamide, 89.94% Water, the gelling time at 90°C is 27.3h, and the gel strength is 0.068MPa.

Embodiment 2

[0035] Add 2.5g of sulfonated tannin extract, 1g of urotropine, 1g of hydroquinone, 1g of water glass and 0.03g of non-ionic polyacrylamide in 44.47g of clear water while stirring, and stir to obtain a water blocking agent into a gel. . Its composition by mass fraction is 5% sulfonated tannin extract, 2.0% urotropine, 2.0% hydroquinone, 2.0% water glass, 0.06% nonionic polyacrylamide, 89.94% water, the gelling time at 110°C is 18.2h, and the strength of the gel is 0.073MPa.

Embodiment 3

[0037]While stirring in 44.47g of clear water, add 2.5g of sulfonated tannin extract, 1g of urotropine, 1g of hydroquinone, 1g of water glass and 0.03g of non-ionic polyacrylamide in turn, and wait until the water blocking agent is gelled liquid. Its composition by mass fraction is 5% sulfonated tannin extract, 2.0% urotropine, 2.0% hydroquinone, 2.0% water glass, 0.06% nonionic polyacrylamide, 89.94% water, the gelling time at 130°C is 10.8h, and the gelling strength is 0.075MPa.

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Abstract

The invention relates to a water shutoff agent applicable to high-temperature high-salt oil reservoir water shutoff profile control. The water shutoff agent consists of a main agent, a cross-linking agent, a stabilizing agent and water, wherein the main agent is sulfonated tannin or sodium humate; the cross-linking agent is the combination of an aldehyde cross-linking agent and a phenolic cross-linking agent; and the stabilizing agent is sodium silicate and non-ionic polyacrylamide. The water shutoff agent applicable to the high-temperature high-salt oil reservoir water shutoff profile control provided by the invention is applicable to the oil reservoir water shutoff profile control at the temperature of 90 to 150 DEG C and with the mineralization degree of greater than 2.0*10<5> mg / L; the gelation time is between 5 to 28 hours; and the strength of the formed gel is 0.060 to 0.085 MPa. The water shutoff agent has high integrity; and the plugging ratio to a rock core can be over 92 percent.

Description

technical field [0001] The invention relates to a technology for further enhancing crude oil recovery in the technical field of oil and gas field development engineering, in particular to a water shutoff agent for water shutoff and profile control in high-temperature and high-salt oil reservoirs. technical background [0002] With the deepening of oilfield water injection development and the breakthrough of injected water, edge water and bottom water, excessive water production has become a common problem faced by many oilfields. Excessive water production will cause a series of problems such as decreased oil well production, wellbore corrosion, well wall scaling, and increased sewage treatment costs. Therefore, solving the problem of excessive water production has become a key issue for oilfields to increase oil recovery and reduce costs. Among the many measures for water control and oil stabilization, chemical water shutoff has attracted more and more attention due to its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C09K8/588
Inventor 戴彩丽由庆付阳赵明伟赵光崔亚赵福麟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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