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Biological self-repair depth profile control slug combination and its application method

A self-healing, biopolymer technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling, etc., can solve problems such as poor formation shear resistance, adverse impact on the environment, and increased costs

Active Publication Date: 2021-06-15
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-repair depth profile control slug combination and its application method
  • Biological self-repair depth profile control slug combination and its application method
  • Biological self-repair depth profile control slug combination and its application method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The bio-slug consists of living microorganisms that produce biopolymers and their fermentation products, biopolymers, and fermented nutrients. The living microorganism is Sphingomonas sphingomonas, which can reproduce and reproduce polymers at a reservoir temperature of 40°C. The fermentation nutrient is 38g / L sucrose, 1.6g / L peptone, and 0.6g beef extract / L,K 2 HPO 4 0.4g / L, fermented in the environment of NaCl0.1g / L, the biopolymer content produced is 3% (w / v), the viscosity is at 4000mPa·s; the bacterial cell content in the fermented liquid is 0.1% (w / v).

[0025]The mass percentage of scleroglucan in the biopolymer crosslinking system slug is 0.08% and the composition of crosslinking agent, the mass percentage of sodium dichromate in the crosslinking agent is 0.3%, the mass percent of sodium dithionite The percentage content is 0.15%. The gelling time is 264 hours, and the gelling strength is D (gel code). This biopolymer has strong shear resistance. The impac...

Embodiment 2

[0029] The bio-slug consists of living microorganisms that produce biopolymers and their fermentation products, biopolymers, and fermented nutrients. The living microorganisms are Bacillus bacillus, which can reproduce and reproduce at the oil reservoir temperature of 60°C. 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. , the biopolymer content produced is 0.05% (w / v), the viscosity is 2000mPa·s; the bacterial cell content in the fermentation broth is 0.05% (w / v).

[0030] The mass percentage of scleroglucan in the biopolymer crosslinking system slug is 0.1% and the composition of crosslinking agent, and the mass percentage of sodium dichromate in the crosslinking agent is 0.4%, and the mass percent of sodium hydrosulfate The percentage content is 0.2%. Two cross-linking systems with the same volume, one of which was simulated formation adsorption shear through the sand bed, was then placed under the same stability for cross-linking experiments,...

Embodiment 3

[0040] The bio-slug consists of living microorganisms that produce biopolymers and their fermentation products, biopolymers, and fermented nutrients. The living microorganism is the polymer-producing Sphingomonas that can reproduce at 40°C oil reservoir temperature, and its strain is 38g / L of sucrose, 1.6g / L of peptone, and 0.6g / L of beef extract in the fermentation nutrient. L, K 2 HPO 4 0.4g / L, fermented in the environment of NaCl0.1g / L, the biopolymer content produced is 3% (w / v), adding scleroglucan 2% (w / v), the viscosity is 7000mPa·s; The bacterial cell content is 10% (w / v).

[0041] The mass percent content of scleroglucan in the biopolymer crosslinking system slug is 5% and the composition of crosslinking agent, and the mass percent composition of sodium dichromate in the crosslinking agent is 1%, and the mass percent content of sodium hydrosulfate The percentage content is 1%.

[0042] The chemical polymer crosslinking system slug is composed of polyacrylamide wi...

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Abstract

A combination of biological self-repairing depth profile control slugs, including biological slugs, biopolymer crosslinking system slugs, chemical polymer crosslinking system slugs and isolation slugs; wherein, the biological slugs include living microorganisms, biological Polymers and fermentation nutrients. A method for using a combination of biological self-repairing depth profile control slugs, injecting at a low injection rate lower than the water injection volume, the sequence of injection slugs is: front end slug, middle slug and end slug; the front end slug is biological Slug and isolation slug; the sequence of middle slugs is biopolymer cross-linking system slug, isolation slug, biological slug and isolation slug; the ending slug is chemical polymer cross-linking system slug, for near-wellbore blockage. The invention has good reservoir shear resistance, high gelling quality, and good profile control effect; the deep profile control radius is large, which can effectively avoid water injection circumvention; the combination of each slug is reasonable, and the slug can perform biological regeneration and self-repair in sections. Effectively prolong the life of the total slug, and the validity period is long.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a biological self-repairing deep profile control slug combination and a method for using the same. Background technique [0002] Oilfield water discharge is a common problem in the process of oilfield development. 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 injection well profile control technology is It is one of the means to effectively solve the oilfield water discharge. However, after the oilfield enters the high water-cut or ultra-high water-cut production period, the effect of conventional profile control and water shutoff is relatively limited. distance, it can only improve the water absorption profile and fluid production profile near the wellbore. Moreover, with the increase of the num...

Claims

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Application Information

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Patent Type & Authority Patents(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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