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Method for using sea water or salt water to oil field water injection and collecting process

A technology for oil field water injection and brackish water, which is used in earth-moving drilling, fluid production, wellbore/well components, etc. It can solve the problem that the water quality is difficult to meet the requirements of water injection and chemical flooding, the high cost of drilling wells in aquifers, and the high cost of water extraction. The water volume is difficult to meet the requirements and other problems, to achieve the effect of improving the oilfield water injection development efficiency and recovery rate, facilitating popularization and application, and easy operation

Inactive Publication Date: 2008-03-26
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of my country's major onshore oil fields are located in areas where fresh water resources are scarce. Brackish water is the main water resource in the area, but it cannot be directly used for oil displacement; the preferred water source for offshore oil fields is sea water, but sea water has high salinity and contains relatively There are many suspended solids, organic matter, microorganisms, colloids and other substances, and the water quality is difficult to meet the requirements of water injection and chemical flooding
[0005] In the existing water injection and polymer blending process, the amount of water provided for treating the produced sewage is often difficult to meet the requirements, and the cost of drilling wells for water-bearing formations is very high, so it is urgent to develop new water supply methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a) Seawater first passes through the hydrocyclone separator, solid suspended particles with a particle size of 5 μm or more in the feed water and a specific gravity greater than water are discharged from the lower end of the hydrocyclone separator, and water and other lighter components are discharged from the upper end of the hydrocyclone separator discharge;

[0025] b) After removing solid suspended particles, the effluent of the hydrocyclone separator is introduced into the ultrafiltration membrane separation device to remove colloids and residual oil in the water and reduce turbidity. The ultrafiltration membrane separation device adopts a molecular weight cut-off of 80,000 Dal Dayton's polysulfone ultrafiltration membrane, the operating pressure is 0.2Mpa, and the operating temperature is 25°C;

[0026] c) The permeated water from the ultrafiltration membrane separation device is introduced into the nanofiltration membrane separation device to reduce the degree of...

Embodiment 2

[0034] The cyclone-membrane separation process is the same as that of Example 1, except that the final effluent of the cyclone-membrane separation process is used to prepare the polymer solution for oil displacement. The polymer is a high molecular weight polyacrylamide with a molecular weight of 30 million, and the concentration of the polymer aqueous solution is 1500 mg / L.

[0035] The changes of polymer solution viscosity after different preparation time were detected, and the results are listed in Table 2.

[0036] The impact of table 2 preparation time on the viscosity of polymer solution

[0037] time min

[0038] When the effluent obtained by the cyclone-membrane separation method is used to prepare polyacrylamide aqueous solution, the viscosity of the solution changes little and is relatively stable, and there is no significant decrease in viscosity, and the viscosity retention effect is better than that of polyacrylamide prepared with formation water An aqu...

Embodiment 3

[0040] a) Seawater first passes through the hydrocyclone separator, solid suspended particles with a particle size of 5 μm or more in the feed water and a specific gravity greater than water are discharged from the lower end of the hydrocyclone separator, and water and other lighter components are discharged from the upper end of the hydrocyclone separator discharge;

[0041] b) After removing solid suspended particles, introduce the effluent of the hydrocyclone separator into the ultrafiltration membrane separation device to remove colloids and residual oil in the water and reduce turbidity. The ultrafiltration membrane separation device adopts a molecular weight cut-off of 100,000 dahl Dayton's polyethersulfone ultrafiltration membrane, the operating pressure is 0.2Mpa, and the operating temperature is 25°C;

[0042] c) Introduce the permeated water from the ultrafiltration membrane separation device into the nanofiltration membrane separation device to reduce the salinity a...

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Abstract

The process of utilizing sea water or bittern for oil field water flooding and compounding polymer solution includes the following steps: the first separating in the hydraulic cyclonic separator to eliminate suspended solid particle, the subsequent ultrafiltering with ultrafiltering membrane to eliminate colloid and residual oil and lower turbidity, and final nanometer filtering or filtering in reverse osmosis membrane to lower the mineralization degree and organic matter content, eliminate trace amount of oil and obtain water product. The water output from the cyclonic and membrane separating system is applied in oil reservoir displacement. The present invention applies integrated cyclonic and membrane separating technology in providing water for oil reservoir displacement, and has the advantages of small floor space, low power consumption, high efficiency and broad application foreground.

Description

technical field [0001] The invention relates to a method for using seawater or brackish water in oilfield water injection and polymerisation processes, and belongs to a technique for increasing oil recovery. Background technique [0002] With the development of our country's society and economy, the domestic demand for oil is increasing; how to improve the drilling technology, improve the recovery rate of oil fields as much as possible, and increase crude oil production are very urgent tasks at present. [0003] Injection of water or water-soluble polymer oil displacement agent into the ground is an important means of increasing production in the process of oil recovery, but the water flooding or polymer flooding technology has high requirements on water quality: if the reinjection water is not compatible with the formation water, it is easy to cause Scale and block the formation; or reduce the viscosity of the prepared polymer aqueous solution, which cannot meet the injecti...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/20E21B43/22
Inventor 王铎成怀刚高学理高从堦
Owner OCEAN UNIV OF CHINA
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