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Self-crosslinking polymer, oil field profile control and flooding agent and preparation method

A polymer and self-crosslinking technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of irreversible gelation, the strength of the gel system of coagulation and polymerization reactants, and the long-term stability of plugging integrity. , achieve excellent temperature and salt resistance, improve temperature and salt resistance and aging stability

Active Publication Date: 2022-05-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After the polymer coagulation reactant gel system provided by the prior art is injected into the formation, after shearing, retention adsorption, chromatographic separation, and water invasion and dilution, the strength, plugging integrity, and long-term stability of the polymer coagulation reactant gel system Both are significantly reduced, and the gelation is irreversible, and it is difficult to drive the remaining oil at the blind end of the fine-pore throat after gelation

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  • Self-crosslinking polymer, oil field profile control and flooding agent and preparation method
  • Self-crosslinking polymer, oil field profile control and flooding agent and preparation method
  • Self-crosslinking polymer, oil field profile control and flooding agent and preparation method

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preparation example Construction

[0041] On the other hand, the embodiment of the present invention also provides a preparation method of the above self-crosslinking polymer, wherein the preparation method includes:

[0042] The acrylamide monomer and the allyl quaternary ammonium salt are polymerized under the action of an initiator to obtain a polymerized reactant.

[0043] Among them, the acrylamide monomer and the allyl quaternary ammonium salt monomer open the double bond under the condition of the initiator to form a polymer, which is the process of forming a macromolecule from a small molecule.

[0044] Under the action of the alkali metal salt of the hydrolyzing agent, the polymerized reactants are hydrolyzed at high temperature to obtain the self-crosslinked polymer.

[0045] Wherein, hydrolysis is a process in which acrylamide monomer units are hydrolyzed to form acrylate units. For example, the acrylate units can be sodium acrylate units, which can increase the electrostatic repulsion between macrom...

Embodiment 1

[0062] This embodiment provides a kind of self-crosslinking polymer, and its preparation method is as follows:

[0063] Water, acrylamide, and N,N-dimethyl-(p-octadecylbenzene)-allyl ammonium chloride (that is to say, the R group is octadecyl) are sequentially added to the reaction vessel, wherein, The molar ratio of acrylamide:N,N-dimethyl-(p-octadecylbenzene)-allyl ammonium chloride is 99.0:1.0, and the total monomer concentration in the polymerization system is controlled to be 25%. At 5°C, Add a composite initiator composed of potassium persulfate and sodium bisulfite to the polymerization system to initiate polymerization, wherein the mass ratio of potassium persulfate to sodium bisulfite is 1:1, and the mass of potassium persulfate is 0.015% of the total mass of monomers. %. Place the polymerization system in an adiabatic environment, and stop the reaction when the central temperature of the polymerization system rises to the highest and remains unchanged. After the co...

Embodiment 2

[0067] This embodiment 2 provides a self-crosslinking polymer, the preparation method of the self-crosslinking polymer is the same as the polymerization method involved in embodiment 1, the difference is: acrylamide: N,N-dimethyl-( Octadecylbenzene)-allyl ammonium chloride molar ratio is 99.9:0.1.

[0068] Ubbelohde viscometer (0.55 mm diameter) was used to test the polymer molecular weight of the self-crosslinking polymer obtained in Example 2 according to GB / T 12005.10-92, and the viscosity-average molecular weight was 18.15 million.

[0069] The dry powder of the self-crosslinking polymer obtained in Example 2 was dissolved at 45°C in a solution with a total salinity of 4.0×10 4 mg / L, the total concentration of calcium and magnesium ions is 1500mg / L, and the polymer solution with a concentration of 10000mg / L is prepared, and the polymer dissolution time is 1.5h, 90°C, 7.34s -1 The viscosity test under the DV-II viscometer is 340.5mPa·s, and the viscosity retention rate is ...

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Abstract

The invention discloses a self-crosslinking polymer, an oil field profile control and flooding agent and a preparation method, and belongs to the field of oil field profile control and flooding. The chemical structural formula of the self-crosslinking polymer is shown in the following formula (I), in the formula, R is carbon chain alkyl with the carbon atom number of 15-25, and X is Cl <-> or Br <->; x is equal to 0.01-0.3, y is equal to 0.01-0.3, z is equal to 0.001-0.05, and x + y + z is equal to 1. The polymer is reversible in gelling, has an effect of deep profile control, and is particularly suitable for being used as an oil field profile control agent.

Description

technical field [0001] The invention relates to the field of oil field control and displacement, in particular to a self-crosslinking polymer, an oil field control and displacement agent and a preparation method. Background technique [0002] After the middle and late stages of oilfield water injection development, the remaining oil in the near-wellbore area of ​​the injection well is less, the oil-water distribution relationship is becoming more and more complex, the phenomenon of multi-layer high water cut is becoming more and more common, and the contradictions in layers are becoming more and more prominent. The traditional steering method in the near-wellbore area can no longer Significantly increase the formation recovery rate. Therefore, in the late stage of oilfield development, deep steering technology is generally used as a development method. Deep profile control and flooding technology is an effective technical measure to control the contradiction between injecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/02C09K8/588
CPCC08F220/56C09K8/588C08F226/02
Inventor 熊英周华兴张杰张勇林云邓鲁强许红恩李冉郭志强巩磊
Owner PETROCHINA CO LTD
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