Research on a new kind of CO<sub>2</sub> flooding injection string and its application in Subei oilfield

Cao Liyuan

doi:10.13809/j.cnki.cn32-1825/te.2019.03.014

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Research on a new kind of CO₂ flooding injection string and its application in Subei oilfield

更新时间：2025-12-05

- Research on a new kind of CO₂ flooding injection string and its application in Subei oilfield
- Petroleum Reservoir Evaluation and Development Vol. 9, Issue 3, Pages: 73-76(2019)
- 作者机构：
  
  中国石化华东油气分公司采油厂,江苏,泰州,225300
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2019.03.014
  CLC： TE357
- Published：2019
- 稿件说明：
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Cao Liyuan. Research on a new kind of CO₂ flooding injection string and its application in Subei oilfield[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 73-76.
DOI：

Cao Liyuan. Research on a new kind of CO₂ flooding injection string and its application in Subei oilfield[J]. Petroleum Reservoir Evaluation and Development, 2019, 9(3): 73-76. DOI： 10.13809/j.cnki.cn32-1825/te.2019.03.014.

摘要

驱油是有效提高原油采收率的手段之一。苏北油田自2005年开始注CO

驱油试验

前期注气管柱采用Y221封隔器密封管柱

基本满足注气的要求

但也存在注气管柱气密封性能差、反洗阀打不开、无法循环更换油套环空缓蚀剂等问题

导致油管、油层套管腐蚀严重

后期施工困难。从2014年起

在研制采用Y445J封隔器的基础上

对油管材质等进行改进优化

设计了新型CO

驱油注气管柱（

73.02 mm N80-3Cr-BGT1扣气密封油管+滑套开关+Y445J封隔器+

73.02 mm N80外加厚油管+多功能注气阀）。现场试验8井次

试验井均能够保证套压长期为零的良好状态。试验表明

该管柱具有气密封性能良好、可以循环更换油套环空缓蚀剂、防返吐等优点

各项性能符合设计要求

值得推广。

Abstract

flooding is one of the effective methods for EOR. CO

flooding test has been started in Subei（northern Jiangsu province） oilfield since 2005. Y221 packer was used to seal pipe column in the early stage

which basically met the requirements of gas injection. But there still existed problems such as the poor gas sealing performance of gas injection pipe string

the backwashing valve could not be opened

or the casing annulus corrosion inhibitor could not be replaced in circulation

which led to serious corrosion of tubing and casing

and it brought difficulties to the later operation. Since 2014

by improving and optimizing the tubing materi

a new CO

flooding pipe string （

73.02 mm N80-3Cr-BGT1 gas sealing tubing+sliding sleeve switch+Y445J packer+

73.02 mm N80 thickening tubing+gas admittance valve of multi-function） has been designed based on the development and application of Y445J packer. And field tests have been conducted for 8 wells

all of which can ensure the good condition of casing pressure being zero for a long time. The experiment shows that the pipe string has the advantages of good gas sealing performance

circulating replacement of oil casing annulus corrosion inhibitor

and preventing back flow. The performance meets the design requirements

and is worth popularizing.

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Related Institution

Research Institute of Oil and Gas Technology, PetroChina Changqing Oilfield Company

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AI问答

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Research on a new kind of CO2 flooding injection string and its application in Subei oilfield

DOI：10.13809/j.cnki.cn32-1825/te.2019.03.014

摘要

Abstract

关键词

Keywords

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Research on a new kind of CO₂ flooding injection string and its application in Subei oilfield