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Membrane treatment process for oilfield reinjection water

A technology for oil field re-injection and treatment process, applied in the field of oil-field re-injection water treatment, can solve the problems of complex composition of oil field produced water, failure to reach the water injection precision of ultra-low permeability oil layers, complex treatment process, etc., and achieve one-time investment reduction and simplification The effect of re-injection process and short process flow

Active Publication Date: 2011-10-26
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the problem that the composition of the produced water in the oil field is complex, the traditional process can not reach the water injection accuracy of the ultra-low permeability oil layer, and the general treatment process is relatively complicated, and proposes the oil field reinjection water membrane treatment process with the ceramic membrane as the core technology. Ensure that the filtered effluent quality meets the reinjection water requirements of ultra-low permeability oilfields

Method used

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  • Membrane treatment process for oilfield reinjection water
  • Membrane treatment process for oilfield reinjection water
  • Membrane treatment process for oilfield reinjection water

Examples

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Effect test

Embodiment 1

[0031] Such as Figure 6 Shown, a kind of oilfield reinjection water membrane treatment process comprises the following steps:

[0032] (1) After the oily sewage is naturally settled to remove most of the suspended solids and oil, it is input into the circulation tank, and then enters the ceramic membrane equipment through the feed pump and the circulation pump in turn. On-line detection equipment is installed at the water inlet of the ceramic membrane ultrafiltration equipment to realize on-line monitoring of the incoming water quality, and automatically adjust the frequency of the circulating pump according to the change of the incoming water quality to change the flow rate of the membrane surface. In this embodiment, the incoming water oil content is 15.3mg / l, and the ceramic membrane in the ceramic membrane equipment is a high-flux ceramic membrane (such as figure 2 As shown), the ceramic membrane adopts symmetric or asymmetrical film formation with an average pore diame...

Embodiment 2

[0035] Such as Figure 6 Shown, a kind of oilfield reinjection water membrane treatment process comprises the following steps:

[0036] (1) After the oily sewage is naturally settled to remove most of the suspended solids and oil, it is input into the circulation tank and then enters the ceramic membrane equipment through the feed pump and the circulation pump in turn. On-line detection equipment is installed at the water inlet of the ceramic membrane ultrafiltration equipment to realize on-line monitoring of the incoming water quality, and automatically adjust the frequency of the circulating pump according to the change of the incoming water quality to change the flow rate of the membrane surface. In this embodiment, the incoming water oil content is 53.1mg / l, and the ceramic membrane in the ceramic membrane equipment is a high-flux ceramic membrane (such as figure 2 As shown), the ceramic membrane adopts symmetrical or asymmetrical film formation with an average pore size...

Embodiment 3

[0039] Such as Figure 6 Shown, a kind of oilfield reinjection water membrane treatment process comprises the following steps:

[0040] (1) After the oily sewage is naturally settled to remove most of the suspended solids and oil, it is input into the circulation tank, and then enters the ceramic membrane equipment through the feed pump and the circulation pump in turn. On-line detection equipment is installed at the water inlet of the ceramic membrane ultrafiltration equipment to realize on-line monitoring of the incoming water quality, and automatically adjust the frequency of the circulating pump according to the change of the incoming water quality to change the flow rate of the membrane surface. In this embodiment, the incoming water oil content is 81.4mg / l, and the ceramic membrane in the ceramic membrane equipment is a high-flux ceramic membrane (such as figure 2 As shown), the ceramic membrane adopts symmetric or asymmetrical film formation with an average pore diame...

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Abstract

The invention relates to a membrane treatment process for oilfield reinjection water, which comprises the specific steps of: firstly introducing oil-containing wastewater into a settling tank for naturally settling to remove part of large suspended solid granules and waste oil; directly introducing the settled water into a ceramic membrane ultrafiltration device for internal circulating filtration, directly using the liquid penetrating through the membrane for reinjection, introducing the circulating liquid containing large amounts of suspended solid granules and waste oil which do not penetrate through the membrane into the settling tank for continuing settlement, mixing with inflow water and introducing into the ceramic membrane ultrafiltration device for filtration again; automatically discharging pollutants when the wastewater in a circulation tank reaches a certain concentration ratio; and automatically adjusting the membrane surface flow rate of an online detection device according to the inflow water quality conditions, so as to achieve the purpose of energy conservation. The membrane treatment process provided by the invention has the advantages of simple process, low investment cost, high filtering precision, no need for the introduction of any reagents during the treatment process, no secondary pollution, etc.

Description

technical field [0001] The invention relates to a method for oilfield reinjection water treatment, belonging to the field of water treatment. Background technique [0002] Among my country's currently developed petroleum geological reserves, ultra-low permeability reserves account for 10% of the total developed reserves. With the further development of oilfields, the proportion of ultra-low permeability oilfields will gradually increase. Taking Daqing Oilfield as an example, during the "Eleventh Five-Year Plan" period, Daqing Oilfield plans to develop about 30,000 new oil and water wells, of which the ultra-low permeability oilfield infrastructure wells account for 40%. According to the "Recommended Injection Water Quality Index for Clastic Reservoirs" (SY5329-94), the injection water quality should meet the requirements for A1-level ultra-low permeability reservoirs. The main indicators are: oil content ≤ 5mg / L, suspended solid content ≤ 1mg / L, grain Median diameter ≤ 1μm....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F1/40C02F1/52C02F1/44
Inventor 张宏张斯凡彭文博王志高
Owner JIANGSU JIUWU HITECH
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