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Chromium and aluminum ion compound type profile control agent for positive rhythm oil deposit and application method thereof

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling, cleaning tools, etc., can solve the problems of low efficiency of positive rhythm oil reservoirs, weak water energy in low permeability zones, and low recovery degree, etc. Achieve the effect of inhibiting viscosity reduction effect, long glue breaking time and improving oil recovery

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

[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 been displaced by water many times, and the degree of water washing is high, which is the main oil-water contribution zone. The low-permeability zone in the high part has weak water body energy and low degree of water flooding, resulting in low oil displacement efficiency

Method used

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  • Chromium and aluminum ion compound type profile control agent for positive rhythm oil deposit and application method thereof
  • Chromium and aluminum ion compound type profile control agent for positive rhythm oil deposit and application method thereof
  • Chromium and aluminum ion compound type profile control agent for positive rhythm oil deposit and application 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 actual production.

[0036] 3. The specific application dosage is:

[0037] 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, the mass ratio of compound polymer, chromium acetate, aluminum citrate, sodium sulfite, resorcinol, triethanolamine, potassi...

Embodiment 2

[0063] 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.

[0064] 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.

[0065] 3. The specific application dosage is:

[0066] 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, the mass ratio of compound polymer, chromium acetate, aluminum citrate, sodium sulfite, resorcinol, triethanolamine, po...

Embodiment 3

[0092] 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.

[0093] 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.

[0094] 3. The specific application dosage is:

[0095] 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, the mass ratio of compound polymer, chromium acetate, aluminum citrat...

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Abstract

The invention discloses a chromium-aluminum ion composite profile control agent for positive rhythm oil reservoirs and a method for using the same, relating to the field of oilfield applied chemistry. In the present invention, the profile control agent is injected into the positive rhythm reservoir in the form of double slugs, and the pre-slug uses partially hydrolyzed polyacrylamide and chromium-aluminum ion cross-linking agent with different molecular weights to form a compound with a skeleton cross-linking structure. Polymer, which can implement stable plugging of the high-permeability area at the bottom of the reservoir; the post-slug is a plugging agent with delayed gelation, which is injected into the formation after the front-slug is effectively blocked. Small, it can effectively selectively seal the middle and low permeability layers, and after it is gelled, it can be combined with the front slug to complete the plugging of positive rhythm reservoirs; the reservoir heterogeneity can be improved by the combination of double slugs To increase the follow-up water flooding sweep coefficient, thereby improving the poor profile control effect and ineffective water circulation in positive rhythm reservoirs, so as to improve the economic benefits of positive rhythm reservoirs.

Description

technical field [0001] The invention relates to a profile control agent compounded with chromium-aluminum ions in positive rhythm oil reservoirs and its application method. The profile control agent can improve the adaptability of reservoirs and further increase the oil recovery rate of positive rhythm oil reservoirs, and belongs to oilfield applications Chemical 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/508C09K8/584E21B33/13E21B37/06
CPCC09K8/512C09K8/5083C09K8/5086C09K8/584E21B33/13E21B37/06
Inventor 张晓丽袁鹏飞李新张志群宋鑫王磊马骁付小坡
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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