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Novel complex surface active degradation agent used for releasing the blocking of Polymer/Surfactant flooding

A composite surface and surface active technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., to achieve the effects of long validity period, meeting the requirements of on-site construction, and extensive economic and social benefits

Inactive Publication Date: 2009-10-07
大庆开发区东油新技术有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The present invention aims at overcoming the problem in the background technology that the clogging of polymer injection surface agent wells affects the oil reservoir recovery, and provides a novel composite surface active degrading agent for removing the clogging of polymer surface agent flooding, the composite surface active degrading agent It has the characteristics of good compatibility with the formation, no pollution, and good fluidity

Method used

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  • Novel complex surface active degradation agent used for releasing the blocking of Polymer/Surfactant flooding

Examples

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Embodiment 1～11

[0034] Artificial rock core is used, the specification is Φ2.5cm×10.0~10.3cm, and the gas permeability is 335×10 -3 ~393×10 -3 μm 2 , the high-concentration (3500mg / L) polysurfactant prepared by using sewage was injected into the rock core up to 5PV to simulate formation blockage, causing about 80% of its pores to be blocked, and the composite surface-active degradation agents of various concentrations in Table 1 were used Blocking removal, under the condition of 45°C, the reaction time is 24h, the experimental results are shown in Table 2:

[0035] Table 1

[0036]

[0037] Table 2 Plugging removal experiment of polymeric surface agent plugged core (injection of polymeric surface agent 5PV, flow rate 1mL / min)

[0038] the rock

[0039] From all the examples, it can be seen that the composite surface-active degradation agent is used in tertiary oil recovery to remove plugging in flooding water wells with polysurfactants, and has the effect of unblocking ...

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Abstract

The present invention relates to a novel complex surface active degradation agent used for releasing the blocking of surfactant flooding. The invention mainly settles a problem that the well blocking of polymer / surfactant affects the recovery rate of oil accumulation. The invention is characterized in that the components and matching ratio are as follows by weight: 0.03-3.0% of surface activity degradation agent, 0.1-3.0% of weak degradation agent, and the balance of water. The complex active degradation agent is used for deblocking oil-water well of polymer / surfactant flooding in tertiary oil recovery. The oil layer can be excellently protected. Furthermore the complex surface active degradation agent used for releasing the blocking of surfactant flood further has the following advantages of good compatibility with stratum, no pollution, excellent fluidity, good safety, good environment-protecting property, long effective period and satisfaction to the field construction requirement.

Description

Technical field: [0001] The invention relates to a degradation agent used in the field of tertiary oil recovery in oil fields, in particular to a novel composite surface active degradation agent used for removing clogging by polymer surface agent flooding. Background technique: [0002] With the increasing shortage of energy, how to displace the remaining oil in the oil field to ensure the continuous and stable production of crude oil has become an important issue in the current national energy strategy. Now the tertiary oil recovery method is mainly polymer injection and ASP flooding, which can increase the oil recovery rate by more than 30%. Since the polysurfactant is a high-molecular polymer surfactant, its molecular structure has the characteristics of both polymers and surfactants, and its oil-increasing effect is stronger than that of polymers. Therefore, my country has begun to use polysurfactant instead of polymer flooding. Oil. Polysurfactant flooding is a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/78
Inventor 李福军曹广胜孙志巍夏慧芬任庆宇
Owner 大庆开发区东油新技术有限公司
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