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

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...