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Method for improving oil-water displacement recovery ratio of low-permeable oil reservoir

A technology of oil recovery and water flooding, which is applied in chemical instruments and methods, production fluids, earth drilling and production, etc., and can solve problems such as geological reserves that cannot be converted into crude oil production, difficulties, and crude oil that cannot be recovered

Active Publication Date: 2012-01-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing water injection development method of ultra-low permeability water injection development reservoirs, the water flooding recovery rate is below 25%, and there are still a large amount of geological reserves that cannot be converted into crude oil production, resulting in a huge waste of oil resources
Polymer flooding is currently a relatively advanced enhanced oil recovery technology, which can increase oil recovery by more than 10%, but there is still a large amount of crude oil left in the ground that cannot be recovered, and it can only be used for oil recovery with a permeability greater than 50×10 -3 um 2 The middle and high permeability reservoirs are not suitable for ultra-low permeability reservoirs. How to improve the water flooding effect of ultra-low permeability reservoirs and improve the water flooding recovery of reservoirs is a very difficult task. It is urgent to develop new Technical method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a. Alkyl polyoxyethylene ether sodium sulfate, carboxymethyl cellulose sodium salt, coconut oil amidopropyl sulfobetaine and water are formulated to contain alkyl polyoxyethylene ether sodium sulfate 2000mg / L, coconut oil amidopropyl A mixed aqueous solution of hydroxysulfobetaine 1000mg / L and carboxymethylcellulose sodium salt 2000mg / L.

[0013] b. Mix according to the ratio of mixed aqueous solution:air=1:1 (underground volume) and simultaneously inject into the oil reservoir through the water injection well.

[0014] c. The total injection volume of mixed aqueous solution and air (underground volume) is 5000m 3 , The injection time is 90 to 120 days, and it can also be injected continuously. After the injection is completed, the water injection is resumed. Generally, after the water injection well group takes effect, the average production increase of the corresponding oil production well is 30%, and the validity period is more than 6 months.

[0015] The method fo...

Embodiment 2

[0017] a. Alkyl polyoxyethylene ether carboxylate sodium, carboxymethyl cellulose sodium salt, coconut oil amidopropyl sulfobetaine and water are formulated to contain alkyl polyoxyethylene ether carboxylate sodium 2000mg / L, coconut oil Mixed aqueous solution of amidopropyl sulfobetaine 1000mg / L and polyacrylamide 1500mg / L.

[0018] b. Mix according to the ratio of mixed aqueous solution: air = 1:0.5 (subterranean volume) and inject into the oil reservoir through the water injection well at the same time.

[0019] c. The total injection volume of mixed aqueous solution and air (underground volume) is 5000m 3 , the injection time is 120 days, continuous injection. After the injection is completed, the water injection is resumed. Generally, after the water injection well group takes effect, the average production increase of the corresponding oil production well is 30%, and the validity period is more than 6 months.

[0020] The method for improving the water flooding oil reco...

Embodiment 3

[0022] a. Fatty alcohol ether sodium sulfate, carboxymethylcellulose sodium salt, coconut oil amidopropyl sulfobetaine and water are formulated to contain fatty alcohol ether sodium sulfate 2000mg / L, coconut oil amidopropyl sulfobetaine 1000mg / L, a mixed aqueous solution of polyacrylamide 1500mg / L.

[0023] b. Mix according to the ratio of mixed aqueous solution: air = 1:0.1 (subterranean volume) and simultaneously inject into the oil reservoir through the water injection well.

[0024] c. The total injection volume of mixed aqueous solution and air (underground volume) is 5000m 3 , The injection time is 90 to 120 days, and it can also be injected continuously. After the injection is completed, the water injection is resumed. Generally, after the water injection well group takes effect, the average production increase of the corresponding oil production well is 30%, and the validity period is more than 6 months.

[0025] The method for improving the water flooding oil recov...

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Abstract

The invention relates to a method for improving the oil-water displacement recovery ratio of a low-permeable oil reservoir, which comprises the following steps of: preparing a mixed aqueous solution containing 400-4000mg / L of surfactant and 200-2000mg / L of foam stabilizer from the surfactant, the foam stabilizer and water; and mixing the mixed aqueous solution and a gas according to a volume ratio of the solution to the gas of 1: (0.1-2), and injecting into the oil reservoir through a water injection well, wherein the injection time is 90-120 days. The surfactant is selected from one or two of branched sodium alkybenzenesulfonate, alkyl polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether sodium carboxylate, fatty alcohol ether sodium sulfate and cocoamido propyl hydroxy sulfobetaine; the foam stabilizer is sodium carboxymethylcellulose; and the gas is air. According to the invention, after the water content of the extracted solution reaches 60 percent, the oil displacement efficiency is improved by 20 percent compared with waterflooding, and the water content is reduced by 13-27 percent.

Description

Technical field: [0001] The invention relates to an ultra-low permeability (permeability 1~10×10 -3 um 2 ) water flooding to develop oilfields with medium and high water cut periods to stabilize oil and control water (or increase oil and reduce water), improve the effect of water flooding, and increase the recovery factor of water flooding. Background technique [0002] Ultra-low permeability and low pressure reservoirs have low permeability (1~10×10 -3 um 2 ), the reservoir pressure is low (the pressure coefficient is about 0.7), and the water injection development method is adopted. After entering the medium-high water-cut development period of the oil field, how to improve the effect of water flooding, increase the production of a single well, stabilize oil and control water (or increase oil and reduce water), and improve the recovery rate of water flooding of reservoirs have always been the research and tackling problems of oilfield development technicians. question....

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/594
Inventor 高春宁庞岁社武平仓王丽莉杜朝锋
Owner PETROCHINA CO LTD
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