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Biological self-healing deep profile control slug combination and using method thereof

A self-healing, biopolymer technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling and mining, etc., can solve the problem of low gel strength at the front end, large amount of chemical polymers, and no self-healing function and other problems, to achieve the effect of good reservoir shear resistance, good rheological properties, and avoid water injection circumvention

Active Publication Date: 2016-07-06
高立红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many disadvantages in the current deep control and flooding that need to be further solved and improved: chemical polymers have poor formation shear resistance, and after long-distance formation migration, the molecules are repeatedly sheared and the viscosity decreases, resulting in poor gelling effect; considering High injection pressure at the wellhead increases the hidden danger of formation fracture. Generally, the concentration of chemical polymer in the front-end slug of chemical deep profile control is low, resulting in low jelly strength at the front end and poor plugging adjustment performance; the chemical polymer cross-linking system is sheared by the reservoir The gel breaking time is shortened, once the gel is broken, the profile control will fail, and there is no self-repair function; the amount of chemical polymer used for deep profile control is large, and the production fluid output will bring adverse effects on production and environmental pollution, which will increase the cost of subsequent treatment

Method used

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  • Biological self-healing deep profile control slug combination and using method thereof
  • Biological self-healing deep profile control slug combination and using method thereof
  • Biological self-healing deep profile control slug combination and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The biological slug is composed of living microorganisms that produce polymer and its fermentation product biopolymer and fermentation nutrients. The living microorganisms are Sphingomonas that can reproduce and multiply at the temperature of the oil reservoir at 40°C. The strain is sucrose 38g / L, peptone 1.6g / L, and beef extract 0.6g. / L, K 2 HPO 4 Fermented in an environment of 0.4g / L and NaCl0.1g / L, the biopolymer content is 3% (w / v), the viscosity is 4000mPa·s; the bacterial cell content in the fermentation broth is 0.1% (w / v).

[0025] The mass percentage of scleroglucan in the biopolymer cross-linking system slug is 0.08% and the cross-linking agent is composed, the mass percentage of sodium dichromate in the cross-linking agent is 0.3%, and the mass percentage of sodium dithionite The percentage content is 0.15%. The gelation time is 264h, and the gelation strength is D (gel code). The biopolymer has strong shear resistance. The crosslinking system has basically th...

Embodiment 2

[0029] The biological slug is composed of living microorganisms that produce polymer and its fermentation product biopolymer and fermentation nutrients. The living microorganisms are Bacillus spores that can reproduce and multiply at the oil reservoir temperature of 60°C. The fermentation nutrient of the bacteria is: sucrose 20g / L, peptone 1g / L, yeast powder 1g / L, KH 2 PO 4 4g / L, K 2 HPO 4 1g / L, NaNO 3 1g / L, MgSO 4 0.4g / L, pH 7.0-7.2, biopolymer content of 0.05% (w / v), viscosity of 2000mPa·s; bacterial cell content in the fermentation broth is 0.05% (w / v).

[0030] The mass percentage of scleroglucan in the biopolymer cross-linking system slug is 0.1% and the cross-linking agent is composed, the mass percentage of sodium dichromate in the cross-linking agent is 0.4%, and the mass of sodium dithionite is The percentage content is 0.2%. Two cross-linking systems with the same volume, one of which is passed through a sand bed to simulate formation adsorption and shear, and then plac...

Embodiment 3

[0039] The biological slug is composed of living microorganisms that produce polymer and its fermentation product biopolymer and fermentation nutrients. The living microorganism is a polymer-producing Sphingomonas that can reproduce and multiply at the temperature of the oil reservoir at 40°C. The strain is 38g / L sucrose, peptone 1.6g / L, and beef extract 0.6g / L. L, K 2 HPO 4 Fermented in an environment of 0.4g / L and NaCl0.1g / L, the biopolymer content is 3% (w / v), scleroglucan is added 2% (w / v), and the viscosity is 7000mPa·s; fermentation broth The bacterial content in the medium is 10% (w / v).

[0040] The mass percentage of scleroglucan in the biopolymer cross-linking system slug is 5% and the cross-linking agent is composed, the mass percentage of sodium dichromate in the cross-linking agent is 1%, and the mass percentage of sodium dithionite The percentage content is 1%.

[0041] The chemical polymer cross-linking system slug is composed of polyacrylamide with a concentration ...

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Abstract

A biological self-healing deep profile control slug combination comprises biological slugs, a biopolymer cross-linking system slug, a chemical polymer cross-linking system slug and isolation slugs.The biological slugs comprise microorganism living bodies, a biopolymer and a fermentation nutritional agent.A using method of the biological self-healing deep profile control slug combination comprises the steps that injection is carried out at the low injection speed lower than the water injection amount, and front-end slugs, middle slugs and a tail slug are injected in sequence; the front-end slugs include the corresponding biological slug and the corresponding isolation slug; the middle slugs include the biopolymer cross-linking system slug, the corresponding isolation slug, the corresponding biological slug and the corresponding isolation slug in sequence; the tail slug is the chemical polymer cross-linking system slug, and plugging near a wellbore is carried out.According to the biological self-healing deep profile control slug combination and the using method thereof, the oil deposit shearing resistance is good, the glue forming quality is high, and the profile control effect is good; the deep profile control radius is large, and water injection winding streaming is effectively avoided; all the slugs are reasonably combined, and can carry out biological regeneration self-repairing in a staged mode, the service life of a total slug is effectively prolonged, and the validity period is long.

Description

Technical field [0001] The invention relates to the technical field of oil field development, in particular to a biological self-repairing depth profile control slug combination and a use method thereof. Background technique [0002] Oilfield water production is a common problem in the oilfield development process. The heterogeneity of the reservoir and the unfavorable oil-water mobility ratio cause the injected water to rush along the high permeability layer, which greatly reduces the sweep efficiency of the injected water. The profile control technology of water injection wells is One of the effective solutions to water effluent from oil fields. However, after the oilfield enters the high water cut or ultra-high water cut production period, the conventional profile control and water shutoff effect is relatively limited. This is due to the high concentration of chemical agents in the system and the fast gelling speed, which limits its injection volume and effective Distance, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/506C09K8/508E21B33/13
CPCC09K8/506C09K8/5083C09K8/512E21B33/13
Inventor 高立红
Owner 高立红
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