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

A low-permeability, water-collecting technology, applied in grease/oily/floating matter removal devices, liquid separation, chemical instruments and methods, etc., can solve the problems of high operating costs and difficult processing, save costs and reduce processing load , the effect of saving operating costs

Active Publication Date: 2017-03-15
XIAN CHANGQING TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems in the prior art that the well site oil and water are pulled together, the operating cost is high and the follow-up treatment is difficult

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In order to overcome the problems in the prior art that oil and water are pulled together at the well site, the operating cost is high and the follow-up treatment is difficult, this embodiment provides a method such as figure 1 The shown low-permeability and high-water-cut oilfield potential differential oil and water collection process includes the following steps:

[0023] 1) Oil collection: the oil produced from a single well is preliminarily settled in the dirty oil tank 1, and the water-containing oil in the upper part after the preliminary settlement is transported to the nearest combined station 4 by the handling device 3 after purification and treatment.

[0024] 2) Water collection: Drain the oily sewage in the lower part of the single well after preliminary settlement into the low-level water tank, and then flow the oily sewage in the low-level water tank into the water collection station 5 through the water collection pipeline 2 connection.

[0025] 3) Produc...

Embodiment 2

[0030] On the basis of Example 1, the water collection system makes full use of the terrain height difference. The water collection station 5 is set at the place where 3-5 single well water collection pipelines 2 are concentrated. Different from the conventional oil collection process, according to the oil Due to the characteristics of high water cut in the area, more water and less oil, water collection pipelines and stations are set up instead of oil collection pipelines and stations; the reinjection station 7 is set at the center of the oil area.

[0031] In the above step 2) during the water collection process, in some remote and low-lying well sites, the oily sewage in the low-level water tank cannot flow into the water collection station 5 by itself, and the booster device 8 can be used to temporarily pressurize and then pass through the water collection pipeline 2 sent to the water collection station, and the booster 8 is a skid-mounted booster (comprising a water tank, ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/40B01D17/00
Inventor 王国柱夏政郭志强张帆潘新建张超查广平熊超薛洁单巧丽
Owner XIAN CHANGQING TECH ENG
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