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Positive rhythm reservoir poly-surfactant double-slug profile modification agent and utilization method thereof

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling, production fluids, etc., can solve the problems of low efficiency of positive rhythm reservoirs, weak energy of water body in low permeability zone, and low recovery degree, etc. Achieve the effects of inhibiting the formation of dead oil zones, long gel breaking time, and increasing water flooding sweep coefficient

Inactive Publication Date: 2017-11-21
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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  • Positive rhythm reservoir poly-surfactant double-slug profile modification agent and utilization method thereof
  • Positive rhythm reservoir poly-surfactant double-slug profile modification agent and utilization method thereof
  • Positive rhythm reservoir poly-surfactant double-slug profile modification agent and utilization 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, to simulate the source water used in actual production.

[0038] 3. The specific application dosage is:

[0039] 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

[0065] 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.

[0066] 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.

[0067] 3. The specific application dosage is:

[0068] 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

[0094] 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.

[0095] 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.

[0096] 3. The specific application dosage is:

[0097] 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 profile control agent with poly-surface double-slug type 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-slugs are mixed with different molecular mass partially hydrolyzed polyacrylamide and chromium-aluminum ion cross-linking agents to form a polymer with a skeleton cross-linked structure, which can The high-permeability zone at the bottom of the reservoir is firmly blocked; the post-slug is a compound surfactant, which is injected into the reservoir after the front-slug is effectively blocked, and the high-position low-permeability zone is flooded with surfactant to reduce oil Increase the remaining oil content in the reservoir, increase the water absorption index of the oil layer; improve the heterogeneity of the reservoir by means of double slug combination, increase the follow-up water flooding sweep coefficient, and inhibit the formation of dead oil areas in positive rhythm reservoirs, so as to improve the positive rhythm of traditional oil production methods. Rhythmic reservoirs have disadvantages such as low recovery factor and poor economic benefits.

Description

technical field [0001] The invention relates to a profile control agent with poly-surface double-slug type for 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 fi...

Claims

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Application Information

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IPC IPC(8): C09K8/588C09K8/584C09K8/44E21B43/22E21B33/13
CPCC09K8/588C09K8/44C09K8/584E21B33/13E21B43/16
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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