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Method for improving producible oil index by use of starch wastewater

A starch wastewater and recovery technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problem of high cost of activators, and achieve the effect of simple operation, cost reduction and good effect

Active Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency of the high cost of the existing activators, provide a method of turning waste into wealth and utilizing starch wastewater to enhance oil recovery, which not only effectively reduces the cost of microbes to enhance oil recovery, but also solves the problem of Environmental Problems Caused by Discharge of Starch Wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, taking a certain block A of Shengli Oilfield as an example

[0030] A block A in Shengli Oilfield is a high-salinity, medium-high-viscosity unconsolidated sandstone reservoir. The reservoir temperature is 65°C, the reservoir pressure is 15MPa, the permeability variation coefficient is 0.518, the porosity is 34.0%, and the pore volume is 3.6×10 4 m 3 , recoverable reserves 3.6×10 4 t, the formation water salinity is 16000mg / L. Utilize the method of the present invention to improve this block recovery rate, concrete implementation steps are:

[0031] (1) Starch wastewater pretreatment

[0032] First, the starch wastewater is filtered to remove solid waste and residues, and secondly, the pH of the starch wastewater is adjusted to 6.0.

[0033] (2) Determination of the volume concentration of nitrogen source and phosphorus source

[0034] The determination of the volume concentration of nitrogen source and phosphorus source adopts the static culture metho...

Embodiment 2

[0044] Embodiment 2, taking a block B of Shengli Oilfield as an example:

[0045] In a block B of Shengli Oilfield, the reservoir temperature is 70°C, the reservoir pressure is 12MPa, the permeability variation coefficient is 0.426, the porosity is 35.0%, and the pore volume is 5.8×10 4 m 3 , recoverable reserves 7.3×10 4t, the formation water salinity is 9600mg / L. Utilize the method of the present invention to improve this block recovery rate, concrete implementation steps are:

[0046] (1) Starch wastewater pretreatment

[0047] Firstly, the starch wastewater is filtered to remove solid waste and residues, and secondly, the pH of the starch wastewater is adjusted to 7.0.

[0048] (2) Determination of the volume concentration of nitrogen source and phosphorus source

[0049] The determination of the volume concentration of nitrogen source and phosphorus source adopts the static culture method, the specific method is as follows: ① take 100mL of pretreated starch wastewate...

Embodiment 3

[0059] Embodiment 3, taking a block C in Shengli Oilfield as an example:

[0060] The temperature of reservoir C in a block of Shengli Oilfield is 75°C, and the reservoir pressure is 10MPa. The coefficient of variation of permeability is 0.336, the porosity is 30.0%, and the pore volume is 2.1×10 4 m 3 , recoverable reserves 5.2×10 4 t, the formation water salinity is 12000mg / L. Utilize the method of the present invention to improve this block recovery rate, concrete implementation steps are:

[0061] (1) Starch wastewater pretreatment

[0062] Firstly, the starch wastewater is filtered to remove solid waste and residues, and secondly, the pH of the starch wastewater is adjusted to 8.0.

[0063] (2) Determination of the volume concentration of nitrogen source and phosphorus source

[0064] The determination of the volume concentration of nitrogen source and phosphorus source adopts the static culture method, the specific method is as follows: ① take 100mL of pretreated s...

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Abstract

The invention discloses a method for improving a producible oil index by use of starch wastewater. The method comprises the following steps: performing starch wastewater pretreatment, namely regulating the PH value of starch wastewater to 6.0-8.0; determining volumetric concentrations of a nitrogen source and a phosphorus source, wherein the volumetric concentrations of the nitrogen source and the phosphorus source are 0.2%-0.5% and 0.01%-0.03% respectively; determining the air injection allocation quantity, wherein the air injection allocation quantity is that the volume rate of air to the starch wastewater is (5-10):1; determining the injection quantity of the starch wastewater, wherein the injection quantity of the starch wastewater is 0.5PV-1.0PV; tracking and analyzing a field test and a field test result. The method is simple in construction process, is capable of effectively reducing the cost of improving the producible oil index by use of microorganisms and avoiding environment pollution caused by discharge of the starch wastewater and thus can be widely applied to a field test of improving the producible oil index.

Description

technical field [0001] The invention relates to a method for increasing oil recovery in oil exploitation, in particular to a method for improving crude oil recovery by using starch wastewater. Background technique [0002] Microbial enhanced oil recovery is a comprehensive technology that uses the beneficial activities and metabolites of microorganisms in oil reservoirs to change the physical and chemical properties of crude oil and improve the fluidity of crude oil, thereby enhancing oil recovery. As long as the right amount of nutrients are provided, the microorganisms that are beneficial to the enhanced oil recovery can be selectively activated and metabolized to produce products that are beneficial to the flow of crude oil. Compared with other enhanced oil recovery technologies, this technology has the advantages of wide application range, simple operation, and no pollution to the formation and the environment. The activators currently used mainly include glucose, sucro...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/58
Inventor 王增林冯云林军章王静宋欣段传慧巴燕刘涛徐登霆徐鹏王刚曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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