我国CO2驱油注采工艺技术现状及下步研究方向

Abstract

Abstract:

In view of the technical difficulties of CO₂ flooding completion string, the research process and development situation of completion string of CO₂ flooding injection-production well were systematically expounded. It was concluded that the sealing performance of the completion string of injection well and anti corrosion and gas proof performance of production well were the key technologies for the normal production of CO₂ flooding injection-production well. The pilot test of CO₂ flooding in domestic oilfield showed that the continuous optimization of packer and the gas tightness detection of tubing contributed to improve sealing of injection wells, and the technologies like CO₂ corrosion inhibitor formulation, injection strengthening, tube controlling by gas lifting, downhole oil and gas separation were helpful to improve the pumping efficiency of the production wells. Meanwhile, in view of the technical problems faced by the injection and production wells on site, the further research direction of production by CO₂ flooding injection and production technology was pointed out.

Key words: CO₂ flooding, air tightness, anti corrosion and gas, matching technology

CLC Number:

TE357

Qian Weiming,Cao Liyuan,Hu Wendong,Zhang Jinhuan,Zhang Luman,Han Chao. Present situation and further research direction of CO₂ flooding injection-production technology and in China[J].Reservoir Evaluation and Development, 2019, 9(3): 66-72.

Figures/Tables 10

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References 36

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空白腐蚀速率/ （mm·a^-1）	不同浓度下腐蚀速度/（mm·a^-1）			缓蚀率,%
空白腐蚀速率/ （mm·a^-1）	油溶性/ 300 mg·L^-1	水溶性/ 100 mg·L^-1		油溶性	水溶性
1.748 7	0.035 0	0.031 1		89.5	98.2

加注阶段	目的	加注浓度
预膜	使用高浓度缓蚀剂与金属表面充分接触,形成一层较好的缓蚀剂吸附膜	正常加注浓度的10倍
补膜	通过不断加入缓蚀剂使得腐蚀速度维持在一个较低水平,修补吸附膜	依据室内实验制定

井号	检测数/ 扣	一次性合格数/扣	一次性合格率, %	最终合格率, %
C21	326	319	97.85	100
C37B	288	279	96.88	100
CZ1	322	303	94.10	100

井号	注气井段/ m	注气日期	油压/MPa	日注量/ t	累注量/ t
C21	3 122.3~3 179.1	201801	26	25	6 732.97
C37B	2 747.5~2 950.9	201710	13	15	2 381
CZ1	3 087.4~3 132	201711	26	20	5 321.51

Present situation and further research direction of CO₂ flooding injection-production technology and in China

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Present situation and further research direction of CO2 flooding injection-production technology and in China

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Present situation and further research direction of CO₂ flooding injection-production technology and in China