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Profile control agent used for oil field and preparation method thereof

A profile control agent, configuration method technology, applied in chemical instruments and methods, drilling composition, etc., to achieve the effect of reducing the use concentration

Active Publication Date: 2013-10-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a profile control agent for oilfields and its preparation method, using the profile control agent and its configuration method for the configuration of hydrogen sulfide-containing sewage in the oil field, breaking through the previous use of hydrogen sulfide-containing sewage for profile control agent liquid preparation, The problem of the need to remove hydrogen sulfide from sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In September 2011, in the control and flooding well of Qizhong District of Karamay, the hydrogen sulfide content in the sulfur-containing sewage of the oil field was 20mg / L. , 1500mg / L of polymer. Sampling of the prepared solution was carried out. The viscosity of the profile control agent solution was 197.1mPa.s at 24h, 1839mPa.s after 48h, and 2701mPa.s at 10d. The gelling of the profile control agent was obvious. Good stability.

Embodiment 2

[0016] In October 2011, in the control and displacement well of the seventh central district of Karamay, the sulfur-containing sewage of the oil field was 30mg / L. polymer. Sampling of the prepared solution was carried out. The viscosity of the profile control agent solution was 197.1mPa.s at 24h, 1839mPa.s after 48h, and 2701mPa.s at 10d. The gelling of the profile control agent was obvious. Good stability.

Embodiment 3

[0018] When the oil field sewage contains hydrogen sulfide concentration of 40mg / L, the sewage is exposed to oxygen, and the hydrogen sulfide content is reduced to the range of 5mg / L, and 50mg / L of sodium dichromate and 1500mg / L of polymer are added.

[0019] Sampling of the prepared solution was carried out. The viscosity of the profile control agent solution was 197.1mPa.s at 24h, 1839mPa.s after 48h, and 2701mPa.s at 10d. The gelling of the profile control agent was obvious. Good stability.

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PUM

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Abstract

The invention relates to a profile control agent used for an oil field. The profile control agent used for the oil field is composed of oil filed sewage containing hydrogen sulphide, a polymer and sodium dichromate, concentration of the oil field sewage containing hydrogen sulphide is 0.1-20mg / L, added amount of sodium dichromate is 30-50mg / L, the added amount of the polymer is 1500mg / L; when the concentration of sewage containing hydrogen sulphide in the oil field is 20-50mg / L, the sewage is aerated, and when hydrogen sulphide content is reduced to 0.1-20mg / L, 30-50mg / L sodium dichromate and 1500mg / L polymer are added. The profile control agent used for the oil field solves the problems that the sewage containing hydrogen sulphide can not be utilized for preparing a profile control agent taking the polymer as a main agent and gel can not be formed when the profile control agent is prepared by utilizing the sewage containing hydrogen sulphide in the prior art, working concentration of sodium dichromate is reduced, and no reducing agent component such as thiourea is needed to be used.

Description

Technical field: [0001] The invention relates to a profile control agent for oil fields and a preparation method thereof; in particular, the profile control agent is prepared by using hydrogen sulfide-containing sewage in oil fields and the preparation method thereof. Background technique: [0002] At present, there are many types of profile control agents with polymer as the main agent in oilfields, which are widely used in oilfields. However, in order to save water resources in the current oil field, most of the water injection wells use oilfield reinjection sewage, some of which contain hydrogen sulfide, which has a great influence on the viscosity of the polymer, resulting in the viscosity of the polymer not meeting the requirements, and the profile control agent cannot be used. into glue. In the prior art, in order to make the oilfield sewage meet the requirements of polymer formulation, the sewage is generally used to stir and oxygenate the hydrogen sulfide in the mix...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/44
Inventor 宫兆波吴运强李东文娄清香原风刚
Owner PETROCHINA CO LTD