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Method for improving thick oil recovery ratio

A recovery factor and heavy oil technology, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve problems such as insufficient capacity increase capacity, unsatisfactory heavy oil effect, poor development effect, etc. , to achieve the effect of increasing formation energy, improving viscosity reduction and improving effect

Active Publication Date: 2010-10-27
SUNCOO PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, steam huff and puff and steam flooding technologies are mostly used in China to exploit heavy oil, but in recent years, steam huff and puff mining technology has generally entered the stage of high-round and follow-up exploitation. Due to the decline of formation pressure, the development effect has deteriorated and the output has decreased
[0003] CO2 is also used in some high-accumulation oil reservoir areas in China 2 +N 2 The mixed gas flooding method, but the effect of simple gas flooding is not good, and it will consume a lot of energy to press the gas into the formation from the surface, and the CO 2 Compatibility with crude oil has not been fully utilized, and conventional chemical agent huffing and puffing is not ideal for heavy oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. Inject a crude oil extractant aqueous solution with a mass concentration of 5% into the well first. The injection rate should be tested according to the conditions of the field string to ensure that the pipeline does not puncture or leak. The injection volume is Q=∑ξhπr 2 , where ξ represents the porosity of the oil layer, h represents the thickness of the oil layer, and r represents the radius to be treated;

[0030] Step 2, then inject mass concentration again and be 50% urea aqueous solution 20m 3 , the injection speed should be tested according to the situation of the pipe string on site to ensure that the pipeline does not puncture or leak;

[0031] Step 3: Inject steam at the end, the temperature of the steam is 280°C, and the injection volume is 1500m 3 , the injection rate is 150 cubic meters per day, and 2 tons of crude oil extractant stock solution is injected dropwise during the process of injec...

Embodiment 2

[0034] This embodiment includes the following steps:

[0035] Step 1. Inject a crude oil extractant aqueous solution with a mass concentration of 90% into the well first. The injection rate should be tested according to the conditions of the field string to ensure that the pipeline does not puncture or leak. The injection volume is Q=∑ξhπr 2 , where ξ represents the porosity of the oil layer, h represents the thickness of the oil layer, and r represents the radius to be treated;

[0036] Step 2, then inject mass concentration and be 40% urea aqueous solution 40m 3 , the injection speed should be tested according to the situation of the pipe string on site to ensure that the pipeline does not puncture or leak;

[0037] Step 3: Inject steam at the end, the temperature of the steam is 200°C, and the injection volume is 3500m 3 , the injection rate is 100 cubic meters per day, and 6 tons of crude oil extractant stock solution is injected dropwise during the process of injecting ...

Embodiment 3

[0040] This embodiment includes the following steps:

[0041] Step 1. Inject a mixed aqueous solution of crude oil extractant with a mass concentration of 50% and a reservoir protection agent with a mass concentration of 1% into the well first. The injection rate should be tested according to the conditions of the field string to ensure that the pipeline is not punctured or leaked. The total amount of injection is Q=∑ξhπr 2 , where ξ represents the porosity of the oil layer, h represents the thickness of the oil layer, and r represents the radius to be treated; the mass ratio between the crude oil extractant and the aqueous solution of the reservoir protection agent is 2:1;

[0042] Step 2, then inject mass concentration again and be 40% urea aqueous solution 50m 3 , the injection speed should be tested according to the situation of the pipe string on site to ensure that the pipeline does not puncture or leak;

[0043] Step 3, finally inject steam, the temperature of the ste...

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Abstract

The invention discloses a method for improving thick oil recovery ratio. The method comprises the followings steps of: first, injecting 5 to 10 mass percent crude oil extracting agent aqueous solution; then, injecting 10 to 50 m<3> of 40 to 50 mass percent urea aqueous solution; and finally, injecting steam, and simultaneously injecting an crude oil extracting agent dropwise in the process of injecting the 20 to 80 percent of steam or injecting an oil deposit protective agent accomplished with the injection of the crude oil extracting agent each time. By utilizing the characteristics of the crude oil extracting agent, the crude oil extracting agent can search thick oil automatically; because the composition particles of the crude oil extracting agent are close to nano-scale, the functionsof compatibilization and catalysis of the thick oil are derived; and the crude oil extracting agent can rapidly search the thick oil and oil dirt, adsorb on the surfaces of the thick oil and the oil dirt, penetrate and decompose the thick oil and the oil dirt so as to be brought out of the stratum.

Description

technical field [0001] The invention relates to a new process for increasing the recovery rate of petroleum industry, in particular to a method for increasing the recovery rate of heavy oil. Background technique [0002] At present, steam huff and puff and steam flooding technologies are mostly used in China to exploit heavy oil. However, in recent years, steam huff and puff mining technology has generally entered the stage of high-round and follow-up exploitation. Due to the decrease of formation pressure, the development effect has deteriorated and the production has decreased. [0003] CO2 is also used in some high-accumulation reservoir areas in China 2 +N 2 The mixed gas flooding method, but the effect of simple gas flooding is not good, and it will consume a lot of energy to press the gas into the formation from the surface, and the CO 2 Compatibility with crude oil has not been fully utilized, and the effect of conventional chemical agent huffing and puffing on heav...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/20C09K8/584
Inventor 陈军斌王俊奇屈展盖海防
Owner SUNCOO PETROLEUM TECH
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