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
View PDF0 Cites 3 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A double-slug deep profile control agent for low-permeability pore-type oil 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, The characteristics of strong fluidity and strong shear resistance can block the high-permeability pores inside the reservoir; the rear slug is mixed with compound polymer and chromium-aluminum ion cross-linking agent, which has the characteristics of low viscosity and strong fluidity , after the front slug is effectively blocked, it is injected into the reservoir, and the reservoir is controlled and flooded to reduce the remaining oil content in the reservoir and increase the water absorption index; improve the heterogeneity of the reservoir through the combination of double slugs, increase Subsequent water flooding sweep coefficient can inhibit the formation of dead oil areas 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 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap