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Expandable self-generated gas foam gel and preparation method and application thereof

A technology of expanding foam and self-gassing, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of high application cost, and achieve the effects of simple construction, good volume expansion and stability, and good sealing performance.

Active Publication Date: 2015-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of high application cost due to the high-dose and multi-slug plugging adjustment methods currently used in oil fields, the present invention provides a kind of self-generating expandable foam jelly and its preparation method, which is mainly used for the adjustment of oil reservoirs with active edge and bottom water. Cutting plugging water treatment, the prepared foam jelly can expand spontaneously, and is low in cost and easy to use

Method used

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  • Expandable self-generated gas foam gel and preparation method and application thereof
  • Expandable self-generated gas foam gel and preparation method and application thereof
  • Expandable self-generated gas foam gel and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Main drug: polyacrylamide, with a relative molecular mass of 18 million and a degree of hydrolysis of 23%; Na 2 SO 3 , analytically pure; Na 2 Cr 2 o 7 , analytically pure; dilute hydrochloric acid, mass fraction 15%, analytically pure; NH 4 Cl, analytically pure; NaNO 2 , analytically pure. Embodiment 1: prepare the self-gas expandable foam jelly of different PAM concentrations

[0053] Prepare 4 groups of self-gasifying expandable foam jelly solutions, the PAM concentrations are 0.3%, 0.4%, 0.5%, 0.6%, and the cross-linking agent is 0.5% Na 2 Cr 2 o 7 +0.6%Na 2 SO 3 , the heat generating agent is 1mol / L NH 4 Cl+1mol / L NaNO 2 , the pH value is 6.8, and the preparation method is as follows:

[0054] (1) Weigh 0.3g, 0.4g, 0.5g, 0.6g of PAM respectively, add them into 4 groups of beakers filled with 100g of distilled water, stir until uniform; add 0.5g of Na to each group 2 Cr 2 o 7 and 0.6gNa 2 SO 3 , stir until uniform;

[0055] (2) Weigh 4 groups of ...

Embodiment 2

[0067] Embodiment 2: Preparation of self-gas expandable foam jelly with different crosslinking agent concentrations

[0068] Prepare 4 groups of self-generated expandable foam jelly liquid, crosslinking agent (chromium jelly Cr 2 (SO 4 ) 3 Reaction formula such as Ⅰ, mass ratio Na 2 Cr 2 o 7 : Na 2 SO 3 : Cr 2 (SO 4 ) 3 0.5:0.6:0.6) concentrations are 0.15%, 0.3%, 0.6%, 0.9%, PAM concentration is 0.6%, heat generating agent is 1mol / LNH 4 Cl+1mol / LNaNO 2 , the pH value is 6.8, and the preparation method is as follows:

[0069] Cr 2 o 7 2- +3SO 3 2- +8H + →Cr 2 (SO 4 ) 3 +4H 2 o

[0070] I

[0071] (1) Weigh 4 groups of PAM, each group of PAM is 0.6g, respectively add it into 4 groups of beakers filled with 100g distilled water, stir until uniform; weigh 4 groups of Na 2 Cr 2 o 7 、Na 2 SO 3 , respectively added to the above-mentioned 4 groups of PAM solutions, and stirred until uniform, the concentrations of the cross-linking agents in the 4 groups of...

Embodiment 3

[0079] Embodiment 3: Preparation of self-gas expandable foam jelly with different heat generating agent concentrations

[0080] Prepare 4 groups of self-generating expandable foam jelly solutions, the concentrations of heat generating agents are 0.5mol / L, 1mol / L, 1.5mol / L, and 2mol / L, the concentration of PAM is 0.6%, and the concentration of crosslinking agent is 0.5% Na 2 Cr 2 o 7 +0.6%Na 2 SO 3 , the pH value is 6.8, and the preparation method is as follows:

[0081] (1) Weigh 4 groups of PAM, each group of PAM is 0.6g, respectively add it into 4 groups of beakers containing 100g of distilled water, stir until uniform; add 0.5gNa 2 Cr 2 o 7 and 0.6gNa 2 SO 3 , stir until uniform;

[0082] (2) Weigh 4 groups of NH in proportion 4 Cl, NaNO 2 , respectively added in the 4 groups of solutions in step (1), and stirred evenly, the concentrations of heat generating agents in the 4 groups of solutions were respectively 0.5mol / L, 1mol / L, 1.5mol / L, and 2mol / L;

[0083] (...

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Abstract

The invention relates to expandable self-generated gas foam gel and a preparation method and application thereof. The expandable self-generated gas foam gel consists of the following components in percentage by mass in water: 0.4 to 0.6 weight percent of polyacrylamide, 0.4 to 0.6 weight percent of cross-linking agent Na2Cr2O7, 0.5 to 0.7 weight percent of cross-linking agent Na2SO3 and 1mol / L thermogenic agent NH4Cl and 1mol / L thermogenic agent NaNO2; the pH value of solution is regulated to 6.5-7 by hydrochloric acid, and the foam gel is formed at the temperature of 20-50DEG C. The foam gel has the best performance when the pH is 6.5-7, and the gel forming time is 20-90 hours and is controllable. The invention also provides application of the expandable self-generated gas foam gel, the foam gel has the characteristics of high underground volume expansion coefficient, high plugging performance and selective water plugging and can achieve multiple effects of treating edge-bottom water invasion, plugging and blocking.

Description

technical field [0001] The invention relates to a self-generating expandable foam jelly, a preparation method and application thereof, and belongs to the technical field of plugging adjustment agents for oil fields. Background technique [0002] Water production from oil wells is a common phenomenon encountered in the middle and late stages of water flooding oilfield development. Due to the heterogeneity of oil layers, improper development plans and production measures, etc., the water will advance unevenly, resulting in premature water flooding of individual well layers and comprehensive oil field failure. The rapid rise of water cut reduces production and recovery. Oilfield profile control and water shutoff operation is a commonly used and effective measure to solve the problem of water production in oil wells. As the water flooding oil field enters the late stage of high water cut development, the heterogeneity difference of the reservoir further increases, and the water...

Claims

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Application Information

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IPC IPC(8): C09K8/518C09K8/512
CPCC09K8/512C09K8/518
Inventor 齐宁汪洋刘帅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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