Low permeability fracture oil deposit double-segment plug-type profile modifier and using method thereof

A profile control agent and oil reservoir technology, which is applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve the problems of easy formation of water channeling, increase the difficulty of oilfield development, and accelerate the rise of water content, and achieve increased water flooding. Sweep coefficient, suppression of dead oil area generation, effect of improving heterogeneity

Inactive Publication Date: 2017-09-29
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 fracture oil deposit double-segment plug-type profile modifier and using method thereof
  • Low permeability fracture oil deposit double-segment plug-type profile modifier and using method thereof
  • Low permeability fracture oil deposit double-segment plug-type profile modifier 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: the mass ratio of coconut oil fatty acid diethanolamide, la...

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: coconut oil fatty acid diethanolamide, lauryltrimeth...

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

The invention discloses a low permeability fracture oil deposit double-segment plug-type profile modifier and a using method thereof, and relates to the field of oil-field applied chemistry. According to the technical scheme, the low permeability fracture oil deposit double-segment plug-type profile modifier is injected into a low permeability fracture oil deposit through a double-segment plug-type, a front-arranged segment plug has delayed gelatability, when the front-arranged segment plug is injected into the oil deposit at the early stage, the viscosity is low, the front-arranged segment plug can enter near-bore zones, middles and deep cracks of the oil deposit, and stable encapsulation is formed after the front-arranged segment plug is gelatinized; a rear-arranged segment plug is a compound surfactant, after the front-arranged segment plug conducts effective encapsulation, the front-arranged segment plug is injected into the oil deposit, the surfactant is applied to pores which are not encapsulated to reduce remaining oil content in the oil deposit and increase the water-absorption index, and the phenomenon that wax, colloid and asphaltene are deposited in the near-bore zones is avoided; through the mode of combining the two-segment plugs, the heterogeneity of the oil deposit is improved, by increasing subsequent water drive waves and coefficients, forming of a low permeability fracture oil deposit dead oil area is inhibited, so that the shortcomings in the traditional oil recovery method that the low permeability fracture oil deposit is low in recovery rate, poor in economic benefit and the like are solved.

Description

technical field [0001] The invention relates to a double-slug type profile control agent for low-permeability fractured reservoirs and a method for using the same. The profile-controlling agent can improve the adaptability of reservoirs and further increase the oil recovery rate of low-permeability fractured reservoirs, and belongs to oilfield applied chemistry. drug 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 flood...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B33/13C09K8/514C09K8/506
CPCE21B43/16C09K8/506C09K8/514E21B33/13
Inventor 张晓丽袁鹏飞黄岩李春成付强曹广胜刘继颖
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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