Viscoelastic weak gel profile control agent

A viscoelastic, weak gel technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced oil recovery, residual oil retention, inability to reduce oil-water interfacial tension, etc. Efficiency, the effect of improving oil washing efficiency

Active Publication Date: 2010-05-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the conventional weak gel control and flooding technology used in oilfields has achieved good results in practical applications, but there are still some problems. Although the weak gel has a certain gel strength, it will change the water-oil mobility ratio and increase the sweep of injected water. Efficiency, however, the weak gel cannot reduce the oil-water interfacial tension and improve the oil washing efficiency, resulting in a large amount of residual oil remaining in the reservoir pores, reducing the recovery of crude oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The viscoelastic surface-active polymer is composed of 25 parts of acrylamide, 1 part of 3,3-dimethacrylic acid, 1.5 parts of 2-acrylamido-2-dodecylethanesulfonic acid, 2 parts of N, Add N-dimethyl-allyl-hexadecyl ammonium chloride and 71 parts of deionized water into a four-necked bottle, blow nitrogen at 15°C for 30 minutes, add 0.5 parts of initiator, and copolymerize A viscoelastic surface-active polymer is obtained.

[0037] The initiator is composed of ammonium persulfate and sodium sulfite, and the parts by weight of each component of the initiator are: 2.6 parts of ammonium persulfate and 1 part of sodium sulfite, which are uniformly mixed.

[0038] Add 0.12 parts of viscoelastic surfactant polymer, 0.1 part of crosslinking agent chromium acetate, and 0.005 parts of regulator oxalic acid to 100 parts of Daqing simulated salt water, and stir at high speed for 120 minutes to obtain viscoelastic weak gel modifier.

[0039] Take the sample and put it in a jar with ...

Embodiment 2

[0041] The viscoelastic surface-active polymer is composed of 23 parts of acrylamide, 1.5 parts of 3,3-dimethacrylic acid, 3 parts of 2-acrylamido-2-dodecylethanesulfonic acid and 72 parts of deionized water , put into a four-necked bottle, blow nitrogen gas for 30 minutes at 15° C., add 0.5 part of initiator, and copolymerize to obtain a viscoelastic surface-active polymer.

[0042] The parts by weight of each component of the initiator are: 2.8 parts of ammonium persulfate; 1 part of sodium sulfite, mixed uniformly.

[0043] Add 0.15 parts of viscoelastic surfactant polymer, 0.10 part of crosslinking agent chromium acetate, 0.1 part of phenolic resin, and 0.01 part of modifier oxalic acid to 100 parts of Daqing simulated salt water, and stir at high speed for 120 minutes to obtain a weak viscoelastic gel. Repellant.

[0044] Take the sample and put it in a jar with a stopper in the laboratory, and observe the gelation situation in a 45°C constant temperature drying oven. Th...

Embodiment 3

[0046] The viscoelastic surface-active polymer is composed of 25 parts of acrylamide, 1 part of 3,3-dimethacrylic acid, 2.5 parts of N,N-dimethyl-allyl-hexadecyl ammonium chloride and 70.5 parts Add deionized water into a four-necked bottle, blow nitrogen gas for 30 minutes at 15°C, add 1 part of initiator, and copolymerize to obtain a viscoelastic surface-active polymer.

[0047] The parts by weight of each component of the initiator are: 3 parts of ammonium persulfate; 1 part of sodium sulfite, mixed uniformly.

[0048] Add 0.15 parts of viscoelastic surfactant polymer, 0.05 part of cross-linking agent chromium acetate, 0.05 part of chromium lactate, and 0.005 part of regulator oxalic acid to 100 parts of Daqing simulated salt water, and stir at high speed for 120 minutes to obtain viscoelastic weak gel tone. Repellant.

[0049] Take the sample and put it in a jar with a stopper in the laboratory, and observe the gelation situation in a 45°C constant temperature drying oven...

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Abstract

The invention discloses a viscoelastic weak gel profile control agent which is applied in oil field and oil well water injection operation. The viscoelastic weak gel profile control agent comprises the following components in parts by weight: 0.15-0.25 part of viscoelastic surface activity polymer, 0.05-0.15 part of cross-linking agent, 0.001-0.005 part of conditioning agent, and 99.8-99.6 parts of water. The viscoelastic surface activity polymer comprises the following components in parts by weight: 20-30 parts of acrylic amide, 1-2 parts of 3,3-dimethylacrylic acid, 1.5-3.5 parts of 2-acrylamido-2-dodecyl ethanesulfonic acid and/or 1-4 parts of N,N-dimethyl-allyl-hexadecyl ammonium chloride, 60-75 parts of deionized water and 0.3-1 part of initiating agent. The initiating agent comprises the following components in parts by weight: 2.5-3.5 parts of ammonium persulphate and 1 part of sodium sulfite. The viscoelastic weak gel profile control agent of the invention has a certain gel strength, capacity for lowering oil-water surface tensility and adjustable gel forming time, can improve water injection profile, lower oil-water surface tensility, wash away residual oil in a pore canal and improve water injection recovery ratio.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a treatment agent added to injected water during oil well water injection operations. It is mainly a new type of weak gel control and displacement agent invented for the low recovery rate of a large amount of residual oil still lingering in the pores in the late stage of water flooding oilfield development. Background technique [0002] In oilfield water flooding, what is injected is a weakly cross-linked system. Weak gel is a weakly cross-linked system with a non-three-dimensional network structure formed by a low concentration of polymer and cross-linking agent. Such a weakly cross-linked system will slowly "drift" forward as a whole driven by the subsequent injection of water. Therefore, it has the dual functions of deep profile control and oil displacement. [0003] Weak gel control and flooding is one of the techniques for oil stabilization and water con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
Inventor 王洪关刘平德张松熊春明
Owner PETROCHINA CO LTD
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