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Double-slug compound profile control agent for low-permeability fractured reservoir and use method of profile control agent

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling, production fluids, etc., can solve the problems of easy water channeling, increased difficulty in oil field development, and high technical difficulty, and achieve increased water flooding Sweep coefficient, suppression of dead oil zone generation, and improvement of low recovery

Inactive Publication Date: 2017-11-10
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One is that the development effect of the developed oil and gas fields becomes worse, the water cut rises faster, and the production decline accelerates; the other is the impact of the fracture system, especially the structural fractures intensify the heterogeneity of the reservoir. During the process of water injection development, the injected water is easy to follow The fracture system advances forward, so oil wells along the direction of the fractures have quick results, but the water cut also rises rapidly, which is easy to form water channeling and even violent water flooding, which reduces the utilization rate of reserves and increases the difficulty of oilfield development; the third is The grade of undeveloped reserves is getting lower and lower, mainly concentrated in ultra-low abundance and ultra-low permeability reservoirs, and the technical difficulty of optimizing blocks and water injection development is becoming more and more difficult; fourth, the development potential and effective measures are gradually decreasing, and the cost is rising , the contradiction between input and output is increasing
[0004] Under such circumstances, the traditional mining methods and methods are difficult to meet the development needs of low-permeability fractured reservoirs. In particular, it is necessary to carry out supporting and practical development technology research on effective ways to reduce investment, cost and energy consumption, with a view to research and development. Solve the problems of increasing oil recovery rate, recovery factor and economic benefits in oilfield development, thereby promoting the effective production and commercial development of low-permeability fractured reservoirs

Method used

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  • Double-slug compound profile control agent for low-permeability fractured reservoir and use method of profile control agent
  • Double-slug compound profile control agent for low-permeability fractured reservoir and use method of profile control agent
  • Double-slug compound profile control agent for low-permeability fractured reservoir and use method of profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a constant speed at a temperature of 15°C. Stir for 4 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0035] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, to simulate the source water used in oil field production.

[0036] 3. The specific application dosage is:

[0037] Slug A: hydroxypropyl methylcellulose, sodium gluconate, triethanolamine, sodium hexametaphosphate, ammonium chloride, aluminum citrate with a mass ratio of 0.15%: 0.15%: 0.15%: 0.15%: 0.3%: 0.15 %, and the remaining components are water for preparation.

[0038] Slug B: the mass ratio of coconut oil fatty acid diethanolamide and...

Embodiment 2

[0065] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a constant speed at a temperature of 35°C. Stir for 5 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0066] 2. Prepare water, adjust the salinity to 8000mg / L by adding NaCl to the distilled water, to simulate the oil field sewage used in actual production.

[0067] 3. The specific application dosage is:

[0068] Slug A: Hydroxypropylmethylcellulose, sodium gluconate, triethanolamine, sodium hexametaphosphate, dodecyltrimethylammonium chloride, aluminum citrate with a mass ratio of 0.1%: 0.1%: 0.1%: 0.1%: 0.2%: 0.1%, the remaining components are the preparation water.

[0069] Slug B: The mass ratio of coconut oil fatty acid diethanolam...

Embodiment 3

[0096] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a temperature of 55°C, Stir for 6 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0097] 2. To prepare water, adjust the degree of salinity by adding soluble salts to the distilled water, and the final degree of salinity is 35000mg / L, which is used to simulate the oilfield sewage used in actual production.

[0098] 3. The specific application dosage is:

[0099] Slug A: hydroxypropyl methylcellulose, sodium gluconate, triethanolamine, sodium hexametaphosphate, ammonium chloride, aluminum citrate with a mass ratio of 0.2%: 0.2%: 0.2%: 0.2%: 0.4%: 0.2 %, and the remaining components are water for preparation.

[0100] Slug B: The mass rat...

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Abstract

A double-slug composite profile control agent for low-permeability fractured reservoirs and its application method relate to the field of oilfield applied chemistry. The present invention injects into low-permeability fractured reservoirs in the form of double slugs. The front slugs have delayed gelation, and the viscosity is low when initially injected into the reservoirs, and can enter the near-well zone, middle and deep fractures of the reservoir, and form after gelling Stable plugging; the rear slug is a compound surfactant, which is injected into the oil reservoir after the front slug is effectively blocked, and the unplugged pores are flooded with surfactant to reduce the remaining oil content in the reservoir, Increase the water absorption index, improve the deposition of wax, colloid, and asphaltene in the near-wellbore area; improve the heterogeneity of the reservoir through the combination of double slugs, increase the follow-up water flooding sweep coefficient, and inhibit the death of low-permeability fractured reservoirs. Oilfields are formed to improve the disadvantages of traditional oil recovery methods such as low recovery rate and poor economic benefits for low-permeability fractured reservoirs.

Description

technical field [0001] The invention relates to a double-slug composite profile control agent for low-permeability fractured reservoirs and its application method. The profile-control agent can improve the adaptability of reservoirs and further increase the oil recovery rate of low-permeability fractured reservoirs, belonging to oil fields field of applied chemicals. Background technique [0002] With the continuous deepening of oil and gas exploration and the improvement of exploration level year by year, the difficulty of oil and gas exploration is also becoming more and more difficult. Unconventional oil and gas resources have become a hot spot in exploration and development. Low-permeability fractured reservoirs are characterized by low permeability, narrow pore throats and developed micro-fractures, and have certain heterogeneity; due to the influence of temperature, pressure and other factors, it is easy to cause water channeling and fingering during water flooding. ,...

Claims

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Application Information

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IPC IPC(8): C09K8/506C09K8/512E21B33/13E21B43/22
CPCC09K8/506C09K8/512E21B33/13E21B43/16
Inventor 袁鹏飞张晓丽王磊宋鑫李新
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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