Study on Critical Parameters of Nitrogen Injection during In Situ Modification in Oil Shale

被引:0
|
作者
Tao, Shilin [1 ,2 ]
Cen, Xueqi [2 ,3 ]
Yu, Xiaocong [1 ]
Hu, Junqing [4 ]
Kan, Changbin [1 ]
机构
[1] China Univ Geosci, Sch Petr Engn, Wuhan 430074, Peoples R China
[2] SINOPEC, State Key Lab Shale Oil & Gas Enrichment Mech & E, Beijing 102206, Peoples R China
[3] SINOPEC, Petr Explorat & Prod Res Inst, Beijing 102206, Peoples R China
[4] CNPC, Oil Prod Plant Daqing Oilfield Corp Ltd 1, Daqing 163000, Peoples R China
基金
美国国家科学基金会;
关键词
in situ modification of oil shale; thermal injection well; nitrogen insulation; critical nitrogen displacement; thermal insulation process; SUPERHEATED STEAM; WELLHEAD UPLIFT; PRESSURE; FLOW;
D O I
10.3390/en15218034
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
During in situ modification, inappropriate thermal insulation measures applied in annulus of injection wells will cause injection technical problems such as tremendous heat loss, wellhead lifting, serious casing damages, and corrosion. Continuous nitrogen injection into annulus is an effective measure to realize thermal insulation of injection wells. The critical displacement parameters of nitrogen injection in annulus are a key factor in the process of continuous nitrogen injection. However, the critical nitrogen injection rate under various working conditions, such as different well types, different wellhead steam parameters, and insulation pipe parameters, was not fully considered and studied. In this paper, the annular critical nitrogen injection displacement model was established based on the completion structure of injection well by applying the basic principles of heat transfer and fluid mechanics comprehensively. The influencing factors of critical nitrogen injection displacement were calculated and analyzed. The results show that the annular thermal resistance of horizontal wells is larger than that of directional wells for different well types, and the critical nitrogen injection displacement required is higher. The parameter sensitivity analysis shows that with the increase of pressure, steam displacement, and steam dryness, the required critical nitrogen injection displacement rate increases nearly quadratically. However, with the increase of the length and thermal conductivity of insulation pipe, the critical nitrogen injection displacement decreases cubically. The critical nitrogen injection can be reduced by reducing the annular area of the casing annulus and lowering the string deeply. The research results can provide key basic theoretical guidance for improving the heat utilization efficiency of in situ modified wells and reducing the casing damage rate for hot injection wells.
引用
收藏
页数:14
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