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A polymer degradation agent

A technology of degrading agent and polymer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as clogging, and achieve the effect of simple process, recovery of seepage capacity, and good application effect.

Active Publication Date: 2016-01-13
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polymer degradation agent to solve the plugging problem of polymer injection wells

Method used

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  • A polymer degradation agent
  • A polymer degradation agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0010] Polymer Degradant for Polymer Degradation Test

[0011] 70% ammonium sulfate, 10% ammonium persulfate, 3% ATMP, 2% EDTA, 3% OP, 2% dodecyl dimethyl benzyl ammonium chloride and 10% water were mixed to prepare a polymer degradation agent. After preparing the polymer solid powder and on-site sewage into a viscous system of 4000ppm, the viscosity measured by Brookfield viscometer at room temperature is above 3600mpa. As shown in Table 1 below:

[0012] Table 1 Polymer degradation experiment data table

[0013]

[0014] It can be seen from Table 1 that after adding 2% to 4% polymer degradation agent, the degradation rate can reach more than 99% after standing for 24 hours, and the degradation effect is very good. Unblocking caused by polymer is feasible.

Embodiment 2

[0016] Polymer Degradant for Particle Degradation Test

[0017] 70% ammonium sulfate, 5% ammonium persulfate, 1% ATMP, 2% EDTA, 3% OP, 2% dodecyl dimethyl benzyl ammonium chloride and 17% water were mixed to prepare a polymer degradation agent. Add 2% of the above-mentioned polymer degradation agent to the blockage of the profile control oil well, stir it, and observe it for 34 hours. It is found that the blockage is dispersed into many small blocks, and the small blocks are suspended after stirring, indicating that the polymerization The biodegradant is also suitable for plugging removal of profile control wells.

Embodiment 3

[0019] Polymer Degradant Used in Crosslinker Degradation Test

[0020] 70% ammonium sulfate, 5% ammonium persulfate, 3% ATMP, 1% EDTA, 3% OP, 2% dodecyl dimethyl benzyl ammonium chloride and 16% water were mixed to prepare a polymer degradation agent. After the cross-linking agent is compatible with the sewage polymer system, the cross-linking viscosity reaches more than 25000mpa.s, and different amounts of polymer degradation agents are added to observe for 30 hours. After degradation, the viscosity is between 4589mpa s and 35.1mpa s, and the degradation rate is 82.3% to 99.9%. The experimental data are shown in Table 2 below:

[0021] Table 2 Cross-linking agent degradation experiment data table

[0022]

[0023] It can be seen from Table 2 that the degradation effect of the polymer degradation agent on the series of crosslinking agents is obvious.

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Abstract

The present invention provides a polymer degradation agent, which comprises, by mass, 70% of ammonium sulfate, 5-10% of ammonium persulfate, 1-3% of amino trimethylene phosphonic acid, 1-2% of ethylenediaminetetraacetic acid, 3% of an emulsifying agent, 2% of a surfactant, and the balance of water, wherein the emulsifying agent is OP, and the surfactant is dodecyl dimethyl benzyl ammonium chloride. With the polymer degradation agent, free radicals can be produced at a lower temperature, the polymer solution with the high viscosity can be rapidly degraded into the solution with the viscosity close to the viscosity of water, pollution and damage of the polymer solution on the stratum can be effectively relieved, and the seepage capability of the polluted stratum can be recovered. In addition, the polymer degradation agent has characteristics of good site application effect, simple process, and low condition and equipment requirement, and is easy to promote and apply.

Description

technical field [0001] The invention belongs to the field of petroleum development, in particular to a polymer degradation agent. Background technique [0002] When the water cut in the oil field rises to the economic limit at the end of secondary oil recovery, new technologies other than water injection must be used for production, mainly injecting chemical agents, gas solvents or thermal recovery into the oil layer to perform tertiary recovery of the oil layer, which is what we usually call tertiary production. oil recovery. At present, most oil fields at home and abroad are in the process of or gradually turning to tertiary oil recovery. At present, polymers are usually injected into the oil formation according to the difference in the mobility ratio of oil and water in the rock formation during the tertiary oil recovery process. The viscosity of the polymer is very high, which can block large pores, prevent formation water from flowing to the oil well, and can drive an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/524
CPCC09K8/524
Inventor 胡玉国梁海臣李靖张冠洲张有强肖劲松赵兴君
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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