A low-permeability and high-water-cut oil field potential difference oil and water collection process

Abstract

The invention belongs to the technical field of oilfield produced water treatment and particularly relates to a low permeability high water content oilfield potential difference type oil and water collection process. The process includes the following steps of 1) oil collection which includes conducting preliminary sedimentation on produced oil from a single well by adopting a dirty oil tank, adopting a transporting device to pull the water-cut oil on the upper part obtained after preliminary sedimentation to the nearby combination station to be subjected to purification and then transported out; 2) water collection which includes discharging oily sewage on the lower part and obtained after preliminary sedimentation of a single well into a low level water tank and then enabling the oily sewage in the low level water tank to flow into a water collection station by connecting a water collection pipeline; 3) produced water treatment and reinjection: delivering the oily sewage collected in the water collection station into the reinjection station through the water supply pipeline and delivering the treated oily sewage back to the single well through a reinjection pipeline for reinjection. By means of the process, the produced oil is treated and transported away, the water is collected, treated and re-injected, the built facilities are fully utilized, and operation cost is saved.

Description

technical field

[0001] The invention belongs to the technical field of oilfield produced water treatment, and in particular relates to a low-permeability and high-water-content oilfield potential difference oil-collection and water-collection process. Background technique

[0002] Due to the special layout and status of some oilfields in northern Shaanxi and Longdong, at present, when there is no gathering pipeline network or the single well production is too low to reach the minimum delivery volume, the existing process is to transfer all liquids in the well site ( Oil and water) are transported by car to the nearest oil station for treatment and then transported to the joint station. In this way, the cost of transportation is virtually increased, especially in oil fields with high water content (above 80%) In some cases, the vehicle haulage medium is basically oily sewage, which increases the subsequent treatment load. Contents of the invention

[0003] The purpose of t...

Images