Xinjiang Oil & Gas ›› 2022, Vol. 18 ›› Issue (2): 26-32.DOI: 10.12388/j.issn.1673-2677.2022.02.005

Previous Articles     Next Articles

CO2Separate Injection and Matching Testing and Adjustment Technologies in Low-Permeability Reservoirs#br#

  

  1. 1. Research Institute of Oil Production Technology,Daqing Oilfield Co.,Ltd. 2. Key Laboratory of Heilongjiang Province for Oil and Gas Reservoir Stimulation
  • Online:2022-06-24 Published:2022-06-30

低渗透油藏二氧化碳分注工艺及配套测调技术

  

  1. 1.大庆油田有限责任公司采油工程研究院 2.黑龙江省油气藏增产增注重点实验室
  • 作者简介:李海成(1979-),2004年毕业于大庆石油学院石油工程专业,高级工程师,现从事三次采油工艺研究工作。(Tel)13845921787(E-mail)lihaicheng@petrochina.com.cn
  • 基金资助:
    中国石油天然气股份有限公司科技项目“CCUS注采工艺、产出气循环利用及高效防腐关键技术研究”(2021ZZ01-04);中国石油天然气股份有限公司科技项目“松辽盆地(大庆、吉林)CCUS技术集成与工业化试验”(2021ZZ01-08)

Abstract: Regarding the problems encountered during general CO2  injection for low-permeability reservoirs,such as water excessive advancement along a single layer,uneven gas absorption and failure to produce some reserves,CO2  separate injection and matching testing and adjustment technologies are developed. With a corrosion-resistant rubber selected,the packer has a temperature resistance  of 120 ℃ ,and a pressure resistance of 35 MPa. A single-pipe multi-layer technology is developed for CO2 injection. Multi-stage streaming nozzles are also developed. With a throttling differential pressure greater than 5 MPa,the nozzles can meet the demand for multi-layer separate injection in the field. By studying the characteristics of multi-stage streaming nozzles under working conditions, charts are plotted to guide field testing. In addition,matching CO2  sealing detection and separate-layer flow testing technologies are de- veloped to achieve separate-layer adjustment. With this technology and its matching technologies,inter-layer problems can be mitigat- ed,gas channeling can be postponed,and the production degree of thin and poor reservoirs can be improved.

Key words: low-permeability reservoir, CO2 separate injection, multi-stage streaming nozzles, separate-layer flow adjustment, CO2 corrosion-resistant rubber

摘要: 针对低渗透油藏CO2驱笼统注气存在单层突进,吸气不均,部分储量无法动用等问题,研发了CO2分层注入及配套测试技术。优选耐CO2腐蚀橡胶,封隔器耐温120 ℃、承压35 MPa,形成了CO2单管多层注气工艺。研制多级绕流气嘴,节流压差大于5 MPa,满足现场多层分注需求。研究实际工况条件下绕流气嘴特性,绘制图版指导现场测调,同时形成配套CO2验封及分层流量测试技术,实现分层调配。该技术能够缓解层间矛盾,延缓气窜,提高薄差储层动用程度。

关键词: 低渗透油藏, CO2分层注入, 绕流气嘴, 分层流量调配, CO2腐蚀橡胶