Positive rhythm reservoir combined polymer type profile control agent and using method thereof

A technology of profile control agent and polymer, which is applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc. It can solve the problem of low efficiency of positive rhythm reservoirs, weak energy of water bodies in low permeability zones, and low degree of recovery and other problems, to achieve the effects of suppressing the viscosity-reducing effect, prolonging the gel breaking time, and improving heterogeneity

Inactive Publication Date: 2017-10-10
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] The actual recovery degree of a large number of positive rhythm reservoirs is 7.8%-10.8%, which is relatively low, indicating that the efficiency of water flooding in positive rhythm reservoirs is low; The high-permeability zone in the low part of the reservoir has

Method used

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  • Positive rhythm reservoir combined polymer type profile control agent and using method thereof
  • Positive rhythm reservoir combined polymer type profile control agent and using method thereof
  • Positive rhythm reservoir combined polymer type profile control agent and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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.

[0036] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, to simulate the source water used in actual production.

[0037] 3. The specific application dosage is:

[0038] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular weights, the molecular weights are 800*10 4 、1200*10 4 、2000*10 4 , its mass ratio is 25:35:40, and the mass ratio of complex polymer, chromium acetate, sodium sulfite, resorcinol and urotropine is 0.26%: 0.047%: 0.3%: 0...

Embodiment 2

[0064] 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.

[0065] 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.

[0066] 3. The specific application dosage is:

[0067] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular weights, the molecular weights are 800*10 4 、1200*10 4 、2000*10 4 , its mass ratio is 25:35:40, and the mass ratio of complex polymer, chromium acetate, sodium sulfite, resorcinol and urotropine is 0.2%:0.04%:0.2%:0...

Embodiment 3

[0093] 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.

[0094] 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.

[0095] 3. The specific application dosage is:

[0096] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular weights, the molecular weights are 800*10 4 、1200*10 4 、2000*10 4 , its mass ratio is 25:35:40, and the mass ratio of complex polymer, chromium acetate, sodium sulfi...

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Abstract

The invention discloses a composite polymer type profile control agent for positive rhythm oil reservoirs and a method for using the same, relating to the field of oilfield applied chemistry. The present invention is injected into positive rhythm oil reservoirs in the form of double slugs, and the pre-slug is mixed with polyacrylamide and additives of different molecular weights to form a polymer in the form of molecular coils, which can implement a stable seal for the high permeability area at the bottom of the reservoir plugging; the post-slug has delayed gelation, and is injected into the reservoir after the front-slug is effectively blocked. The initial injection into the reservoir has a low viscosity, which can effectively selectively plug the middle and low permeability layers. After it is gelled, it is combined with the front slug to complete the plugging of the positive rhythm reservoir, and the heterogeneity of the reservoir is improved through the combination of double slugs, and the follow-up water flooding sweep coefficient is increased, thereby improving the profile control of the positive rhythm reservoir Poor effect and invalid water circulation to improve the economic benefits of positive rhythm reservoirs.

Description

technical field [0001] The invention relates to a compound polymer type profile control agent for positive rhythm oil reservoirs and its application method. The profile control agent can improve reservoir adaptability, and further improve the oil displacement effect of positive rhythm oil reservoirs, and belongs to oil field application chemical agents field. Background technique [0002] Reservoir heterogeneity refers to the heterogeneity inside the reservoir, mainly manifested as anisotropy in reservoir lithology, physical properties, oiliness, etc., which is the main reason affecting the distribution of remaining oil; according to the vertical direction of the reservoir The changing law of microscopic petrological characteristics of the rock can be divided into positive rhythm, reverse rhythm and compound rhythm reservoirs; positive rhythm reservoirs are the common characteristics of various fluvial sedimentary sand bodies, the grain size changes from coarse to fine from ...

Claims

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Application Information

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IPC IPC(8): C09K8/508C09K8/512E21B33/13E21B37/06
CPCC09K8/512C09K8/5083C09K8/5086E21B33/13E21B37/06
Inventor 黄岩张晓丽袁鹏飞李天民王培龙高超白玉杰付小坡
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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