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Hypotonic duct type oil deposit double-slug profile control agent and use method thereof

A profile control agent and oil reservoir technology, applied in the field of double-slug composite profile control agent in low-permeability pore-type reservoirs, can solve the problems of reducing the sweep efficiency of injected water, difficulty adapting to reservoir complexity, and low water flooding sweep efficiency, etc. problems, to achieve the effects of inhibiting the formation of dead oil zones, improving hydrophilicity, and improving plugging effects

Inactive Publication Date: 2017-11-24
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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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  • Hypotonic duct type oil deposit double-slug profile control agent and use method thereof
  • Hypotonic duct type oil deposit double-slug profile control agent and use method thereof
  • Hypotonic duct type oil deposit double-slug profile control agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 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.

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

[0038] 3. The specific application dosage is:

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

[0040] Slug B: The mass ratio of coconut oil fatty acid diethanolamide and sodium dodecy...

Embodiment 2

[0067] 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.

[0068] 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.

[0069] 3. The specific application dosage is:

[0070] Slug A: Sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid, aluminum citrate with a mass ratio of 1%: 0.05%: 0.2%: 0.4%: 0.1%: 0.15%, and the rest The component is the preparation water.

[0071] Slug B: The mass ratio of coconut oil fatty acid diethanolamide and sodiu...

Embodiment 3

[0098] 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.

[0099] 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.

[0100] 3. The specific application dosage is:

[0101] Slug A: Sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid, aluminum citrate with a mass ratio of 2%: 0.15%: 0.4%: 0.6%: 0.3%: 0.25%, and the rest The component is the preparation water.

[0102] Slug B: The mass ratio ...

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Abstract

A double-slug composite profile control agent for low-permeability pore-type reservoirs and its application method relate to the field of oilfield applied chemistry. The present invention injects into low-permeability pore-type oil reservoirs in the form of double slugs, and the pre-slugs are mixed with sodium silicate, partially hydrolyzed polyacrylamide, sodium hexametaphosphate, sodium sulfite, salicylic acid, and aluminum citrate, and have low viscosity, With the characteristics of strong fluidity and strong shear resistance, it can block the high-permeability pores inside the reservoir; the rear slug is a compound surfactant, and the unplugged pores are flooded with surfactant to reduce Remaining oil content in the reservoir, increase the water absorption index of the reservoir, and improve the deposition of wax, colloid, and asphaltene in the near-wellbore zone; improve the heterogeneity of the reservoir through the combination of double slugs, and increase the follow-up water flooding sweep coefficient , to suppress the formation of dead oil zones in low-permeability pore-type reservoirs, so as to improve the disadvantages of traditional oil recovery methods such as low recovery and poor economic benefits for low-permeability pore-type reservoirs.

Description

technical field [0001] The invention relates to a double-slug composite profile control agent for low-permeability pore-type oil reservoirs and a method for using the same. The profile-control agent can improve the adaptability of reservoirs and further improve the oil-increasing effect of low-permeability pore-type oil reservoirs, belonging to oil fields field of applied chemicals. Background technique [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 ...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/584E21B33/13E21B43/22
CPCC09K8/512C09K8/5083C09K8/584E21B33/13E21B43/16
Inventor 袁鹏飞张晓丽
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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