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Low permeability pore type oil reservoir double-slug deep profile control agent and use method thereof

A deep profile control and profile control agent technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of reducing the sweep efficiency of injected water, difficult to adapt to the complexity of reservoirs, and water flooding sweep efficiency Low-level problems, to achieve the effects of inhibiting the formation of dead oil zones, increasing water injection pressure, and increasing water flooding sweep coefficient

Inactive Publication Date: 2017-10-20
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The overall level of water flooding recovery in onshore oilfields in my country is low, generally lower than 50%. One of the important reasons is that the sweep efficiency of water flooding is low; an important factor affecting the sweep efficiency of water flooding is heterogeneity; low Pore-channel reservoirs are characterized by low permeability, wide pore throats, and micro-fractures. Due to the complexity of pore structure and rock surface properties, low-permeability channel-type reservoirs also have heterogeneity; The propulsion of the pump cannot be uniformly piston-like, causing the injected water to rush along the high-permeability layer, and local water channeling occurs, thereby reducing the sweep efficiency of the injected water and restricting the water flooding recovery.
[0003] The traditional method is to plug the pores and then carry out water flooding. In this method, simple profile control and subsequent water flooding are often difficult to adapt to the complexity of the reservoir, resulting in small-scale water channeling and fingering after plugging. and other phenomena, making it more difficult to further improve the degree of water drive utilization

Method used

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  • Low permeability pore type oil reservoir double-slug deep profile control agent and use method thereof
  • Low permeability pore type oil reservoir double-slug deep profile control agent and use method thereof
  • Low permeability pore type oil reservoir double-slug deep profile control agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. How to use the profile control agent: (1) First, carry out the oxygen blast treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3 mg / L; (2) Add the agent to the prepared water at a temperature of 15 °C, and at a constant speed Stir for 4 hours to obtain a profile control agent; (3) directly inject the profile control agent into the core after the preparation is completed.

[0037] 2. To prepare water, adjust the salinity to 500mg / L by adding NaCl to distilled water to simulate the water source water used in production.

[0038] 3. The specific dosage of the drug is:

[0039] Slug A: sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid, aluminum citrate mass ratio of 1.5%: 0.1%: 0.3%: 0.5%: 0.2%: 0.2% The component is preparation water.

[0040] Slug B: The compound polymer is composed of three kinds of partially hydrolyzed polyacrylamides with different molec...

Embodiment 2

[0067] 1. How to use the profile control agent: (1) First, carry out the oxygen blast treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to less than 3 mg / L; (2) Add the agent to the prepared water at a temperature of 35 °C, and at a constant speed After stirring for 5 hours, the profile control agent is obtained; (3) the profile control agent is directly injected into the core after the preparation is completed.

[0068] 2. To prepare water, adjust the salinity to 8000mg / L by adding NaCl to distilled water to simulate the oilfield sewage used in actual production.

[0069] 3. The specific dosage of the drug is:

[0070] Slug A: Sodium Silicate, Partially Hydrolyzed Polyacrylamide, Sodium Hexametaphosphate, Sodium Sulfite, Salicylic Acid, Aluminum Citrate The component is preparation water.

[0071] Slug B: The compound polymer is composed of three kinds of partially hydrolyzed polyacrylamides with different molecular weights, and th...

Embodiment 3

[0098] 1. How to use the profile control agent: (1) First, carry out the oxygen surge treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3 mg / L; (2) Add the agent to the prepared water at a temperature of 55 °C, at a constant speed After stirring for 6 hours, the profile control agent is obtained; (3) after the preparation is completed, the profile control agent is directly injected into the core.

[0099] 2. Prepare water, adjust the salinity by adding soluble salts to distilled water, the final salinity is 35000mg / L, which is used to simulate the oilfield sewage used in actual production.

[0100] 3. The specific dosage of the drug is:

[0101] Slug A: Sodium Silicate, Partially Hydrolyzed Polyacrylamide, Sodium Hexametaphosphate, Sodium Sulfite, Salicylic Acid, Aluminum Citrate The component is preparation water.

[0102] Slug B: The compound polymer is composed of three kinds of partially hydrolyzed polyacrylamides with ...

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Abstract

Relating to the field of oilfield applied chemistry, the invention provides a low permeability pore type oil reservoir double-slug deep profile control agent and a use method thereof. The profile control agent provided by the invention is injected into a low permeability pore type oil reservoir, in a pre-slug, sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid and aluminum citrate are mixed, so that the pre-slug can have the characteristics of low viscosity, strong fluidity and anti-shear capacity, and can block a high permeability pore in the oil reservoir. In a post-slug, a compounded polymer is mixed with a chromium aluminum ion crosslinking agent, so that the post-slug can have the characteristics of low viscosity and strong fluidity, after effective blockage by the pre-slug, the post-slug is injected into the oil reservoir to implement profile control and flooding so as to reduce the residual oil content and increase the water absorption index of the oil reservoir. The double-slug combination way can improve the nonhomogeneity of the oil reservoir, increase the subsequent waterflooding water flooding sweep coefficient, suppress the formation of a low permeability pore type oil reservoir dead oil area, and improve the disadvantages of low recovery rate, poor economic benefits and the like for low permeability pore type oil reservoirs in traditional oil production methods.

Description

technical field [0001] The invention relates to a low-permeability pore-channel type oil reservoir double slug deep profile control agent and a method for using the same. The profile-control agent can improve the adaptability of the reservoir, and further can improve the oil-increasing effect of the low-permeability pore-channel type oil reservoir, belonging to oil field applications field of chemicals. Background technique [0002] The overall level of waterflooding recovery in my country's onshore oilfields is low, generally lower than 50%, one of the important reasons is the low sweep efficiency of waterflooding; an important factor affecting the sweep efficiency of waterflooding is heterogeneity; Permeable channel reservoirs are characterized by low permeability, wide pore throats and well-developed micro-fractures. Due to the complexity of pore structure and rock surface properties, low permeability channel reservoirs also have heterogeneity; The propulsion of the water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512E21B33/13E21B43/22
CPCC09K8/512E21B33/13E21B43/16
Inventor 张晓丽袁鹏飞白玉杰王磊
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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