Low-cost and sustainable utilization of geothermal resources in oilfields to achieve carbon neutrality

doi:10.3969/j.issn.1674-1951.2021.11.008

Abstract

Abstract:

Carbon neutrality and carbon peaking will bring extensive and profound systematic transformations to economic and social fields and limits to conventional fossil energy development as well.As a clean,low-carbon,stable and sustainable non-carbon energy,geothermal energy is indispensable to achieve the goal of carbon peak and carbon neutrality. There are a large number of inactive oil wells in China,and some of them are of abundant hydro-geothermal resources expecting to be explore scientifically,economically and sustainably.The exploration will be of great significance to realizing carbon neutrality.By summarizing the transformation ways of inactive oil wells into geothermal wells,and analyzing the existing engineering examples of transformed geothermal wells in China and the advantages and bottlenecks of geothermal energy utilization in oil fields,the application prospect of this transformation is made,which provides a reference for subsequent engineering researches.

Key words: carbon neutrality, carbon peak, oil field, geothermal resources, inactive oil well, engineering application, clean and low-carbon

CLC Number:

TE09：TK529

SONG Chaofan, ZHAO Jun, YIN Hongmei, LI Yang, WANG Guiling, ZOU Hongli. Low-cost and sustainable utilization of geothermal resources in oilfields to achieve carbon neutrality[J]. Huadian Technology, 2021, 43(11): 66-73.

Figures/Tables 6

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方法	成本	适用条件	主要步骤
开天窗侧钻法	较高	原井未钻穿馆陶组地层或地层结构完好,但井内有堵塞物	开窗位置导破、取出油层套管;进行开窗作业;钻探施工、下管
直接射孔法	较低	原井已钻穿馆陶组地层,泵室符合要求	下钻杆通井;在取水层下部加人工井底;射孔
改造泵室射孔法	适中	原井已钻穿馆陶组地层,不符合下潜水泵要求	下钻杆通井;在取水层下部加人工井底;针对泵室进行结构性改造,对原井中技术套管和油管之间的环形空间进行封堵;射孔

油田	地温/℃							平均地温梯度/ [℃·(hm)^-1]
油田	1.0 km	1.5 km	2.0 km	2.5 km	3.0 km	3.5 km	4.0 km	平均地温梯度/ [℃·(hm)^-1]
华北油田(含北京)	—	—	66.2~86.6	—	86.8~101.0	—	—	4.0~7.0
大港油田(含天津)	—	—	—	97.5	126.0	140.0	154.0	3.3~4.0
冀东油田	—	56.0	70.0	84.0	99.0	110.0	124.0	2.5~3.3
辽河油田	—	—	85.0	—	100.0	—	141.8	3.2~4.5
胜利油田	48.0~65.0	63.0~80.0	—	—	98.0	—	—	3.7
中原油田	—	—	—	96.7	—	123.0	145.0	3.3
大庆油田	30.0~60.0	—	65.0~118.0	—	90.0~174.0	—	130.0~230.0	1.4~5.7

油田区	井名称	井类型	改造方法
华北	晋14井	报废井	改造泵室射孔法
	霸9井	报废井	酸化洗井后改造泵管
	晋古2-4、晋古2-7井	停产油井	—
大港	GS43井,GX307井,XH24-28井	报废井	开天窗侧钻法
	TR3井	套损井	射孔法
	T38-1,T38-2井	报废井	射孔、防砂技术
大庆	松页油1井	勘探井	螺旋布孔射孔技术
辽河	黄06-6井	废弃井	—
辽河	锦 260 井	报废井	改造泵室射孔法
胜利	牛85、辛65井	报废井	射孔技术
冀东	N34×1井	废弃井	—
江苏	真31井	勘探井	—
吉林	御龙温泉井	勘探井	—