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Low-permeability crack oil reservoir multi-element double-slug type profile control agent and using method thereof

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling and production, and production fluids, etc., can solve problems such as easy water channeling, increased difficulty in oil field development, and accelerated water cut rise, and achieve increased water flooding Sweep coefficient, suppression of dead oil zone generation, and effect of improving heterogeneity

Inactive Publication Date: 2017-10-24
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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  • Low-permeability crack oil reservoir multi-element double-slug type profile control agent and using method thereof
  • Low-permeability crack oil reservoir multi-element double-slug type profile control agent and using method thereof
  • Low-permeability crack oil reservoir multi-element double-slug type profile control agent and using method thereof

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: cetyltrimethylammonium bromide and sodium dodecylsulfonate ...

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: cetyltrimethylammonium bromide and sodium dodecylsul...

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: cetyltrimeth...

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Abstract

The invention provides a low-permeability crack oil reservoir multi-element double-slug type profile control agent and a using method thereof and relates to the field of oil-field applied chemistry. The profile control agent is injected into a low-permeability crack oil reservoir in a double-slug mode, a front-arranged slug has delayed gel forming performance, the viscosity is low in oil reservoir injection at the initial stage, and the front-arranged slug can enter cracks of oil reservoir near-well zones, middles and deep portions, and stable block is formed after gel forming. A rear-arranged slug is a compound surfactant, and after the front-arranged slug is effectively blocked, the front-arranged slug is injected in the oil reservoir, unblocked hole passages are subjected to surfactant driving so as to reduce the content of residual oil in the oil reservoir, increase the water absorption index and improve the phenomenon of sedimentation of waxiness, gelatine and asphaltene in near well zones. Through the double-slug combined mode, the nonhomogeneity of the oil reservoir is improved, the subsequent water drive waves and coefficients are increased, and forming of a dead oil area of the low-permeability crack oil reservoir is inhibited, and the disadvantages that in a traditional oil extraction method, the extraction rate of a low-permeability crack oil reservoir is low, and the economic benefits are poor are overcome.

Description

technical field [0001] The invention relates to a multi-component double-slug type profile control agent for low-permeability fractured reservoirs and its application method. The profile-control agent can improve reservoir adaptability and further improve the oil recovery rate of low-permeability fractured reservoirs, and belongs to oilfield applications Chemical field. 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): E21B43/16E21B33/13C09K8/514C09K8/506
CPCE21B43/16C09K8/506C09K8/514E21B33/13
Inventor 袁鹏飞张晓丽李天民王培龙高超白玉杰
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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