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Biological plugging regulator, preparation method and application

A plugging control agent and biological technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of direct intrusion or channeling of bacterial liquid, poor formation homogeneity, poor application effect, etc., and achieve non-degradation. , Good salt tolerance, increase the effect of sweep volume

Active Publication Date: 2018-07-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, both of the above two methods require the injection of bacterial fermentation liquid or dilution liquid. In view of the poor homogeneity of the formation, the bacterial liquid is easy to directly rush or channel along the large pores to the non-effective area during the injection process, and the actual application effect is not good.

Method used

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  • Biological plugging regulator, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The biological clogging agent in this embodiment is composed of the following components in mass percentage: 10% dry powder of encapsulated strains, 10% nutrient base, 1% hydrogen peroxide, and the balance is water.

[0026] The preparation steps of the encapsulated strain dry powder are as follows:

[0027] 1) Xanthomonas campestris (purchased from China Center for Type Culture Collection, strain preservation number: CCTCCAB96030, genus name: Xanthomonas, species name: campestris, other preservation unit number: ATCC 9924, preservation date: August 1996 10 days) After activation, inoculate into conventional LB medium (or potato medium), ferment and cultivate for 36 hours to the logarithmic phase, centrifuge at a speed of 3000r / min for 20min, discard the supernatant, and take sediment and glycerol according to the volume ratio of 1 : 1 mix evenly, the mixture is first allowed to stand at a temperature of 4°C for 60min, then at a temperature of -30°C and -80°C for 90min,...

Embodiment 2

[0037] The biological clogging agent in this embodiment is composed of the following components in mass percentage: 5% of encapsulated strain dry powder, 0.4% of nutrient base, 0.1% of hydrogen peroxide, and the balance is water. The preparation method is the same as in Example 1.

Embodiment 3

[0039] The biological clogging agent in this embodiment is composed of the following components in mass percentage: 5% of encapsulated strain dry powder, 5% of nutrient base, 0.5% of hydrogen peroxide, and the balance is water. The preparation method is the same as in Example 1.

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Abstract

The invention discloses a biological profiling and plugging agent, a preparation method and an application, which belongs to the technical field of oil field chemistry. The biological profiling and plugging agent consists of the following components by weight percent: 5 to 20 percent of capsulation strain dry powder, 0.4 to 16 parts of nutrient medium, 0.1 to 2 percent of bacteria amount adjusting agent and the balance of water. The biological profiling and plugging agent has characteristics of good salt resistance and good cutting resistance; moreover, the biological profiling and plugging agent is unlikely to degrade, and after the biological profiling and plugging agent is injected into deep stratum, a purpose of depth profile control can be realized. By adopting the capsule particles, the survival rate of the strain can be increased; the capsule particles pass through large pores along with injection liquid and are remained in an area with a pore radius smaller than the radius of the particle so as to form effective plugging, and the swept volume of the injection liquid can be increased; meanwhile, by adjusting the injection amount of the nutrient medium and strain adjusting agent, the growth situation of the flora can be controlled, the profile control or plugging controllable requirement can be met, and the plugging effect is kept effective for a long time.

Description

technical field [0001] The invention relates to a biological plugging regulating agent, and also relates to a preparation method and application of the biological plugging regulating agent, belonging to the technical field of oil field chemistry. Background technique [0002] As the oilfield development enters the late stage, due to the heterogeneity of the oil layer, there will be water breakthrough or channeling in the oil layer, resulting in a sharp increase in water production and a rapid decline in oil production, especially in fractured reservoirs. class questions. Fractured reservoirs have complex structures, heterogeneous reservoir space development and distribution, poor permeability average, and extremely high permeability in fractured zones. It is easy to cause the injected water or groundwater to rush along the fracture, so that the water content of the production well rises sharply in a short period of time, causing the oil well to flood and the production to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/516C09K8/514
CPCC09K8/501C09K8/514C09K8/516C09K2208/18
Inventor 李克智罗懿魏开鹏邓学峰符伟兵张永刚梅洁方群杨欢斯容王薇王萍熊佩刘学全隋冬梅
Owner CHINA PETROLEUM & CHEM CORP
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