In-situ upgrading and transformation of low-maturity shale: Economic feasibility and efficiency enhancement approaches from the perspective of energy consumption ratio

doi:10.13745/j.esf.sf.2022.8.33

Abstract

Abstract:

There are few doubts about the technical applicability of in-situ upgrading technology in developing the enormous oil and gas resource potential of low-maturity shale. However, due to the enormous energy consumption required in shale heating, its economic feasibility is still in doubt for lack of quantitative evidence. On the basis of energy conservation law, this paper quantitatively evaluates energy gained from oil and gas generation and energy consumed by organic matter cracking, shale heating, and wallrock cooling during in-situ heating. The energy consumption ratios under different conditions are obtained and the influencing factors are analyzed. The results show that the energy consumption ratio increases rapidly with increasing TOC. For oil-prone shales, energy consumption ratio corresponding to TOC of ~4.2% is 3, indicating shale with high TOC is expected to lower cost through large-scale operation to make energy consumption ratio greater than 1, so that in-situ heating and upgrading technology can achieve economic benefits. Considering the factors influencing the energy consumption ratio, the main ways to improve economic feasibility include (1) explore technologies for efficient shale heating while reducing heat dissipation from wallrock. (2) Explore technologies for efficient organic matter transformation into oil and gas, that is, shorten in-situ heating time through catalysis. (3) Establish a comprehensive horizontal-well deployment technology that takes a comprehensive consideration of the energy consumption ratio, time cost, and engineering cost.

Key words: shale oil and gas, in-situ upgrading, energy consumption ratio, high-efficiency heating, efficient transformation of organic matter

CLC Number:

P618.12

LU Shuangfang, WANG Jun, LI Wenbiao, CAO Yixin, CHEN Fangwen, LI Jijun, XUE Haitao, WANG Min. In-situ upgrading and transformation of low-maturity shale: Economic feasibility and efficiency enhancement approaches from the perspective of energy consumption ratio[J]. Earth Science Frontiers, 2023, 30(1): 187-198.

Figures/Tables 14

References 55

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分子式及键型	数量
分子式及键型	原始干酪根	残余干酪根		轻质油分子
分子式	C₁₄₃₉H₂₃₆₀O_86.3N_4.3S_1.4	C₃₀₅H₂₅₃O₄N_0.92S_0.92		C₈H_15.4O_0.026N_0.03S_0.015
碳碳单键	1 251	109		5.975
苯环- 碳原子键	40	20
碳碳双键	4			0.7
碳碳三键				0.3
芳键	96	42
碳氮键	12	2		0.03
碳氧键	263	8		0.03
碳氧双键	78			0.01
碳硫键	2	2		0.001 5
酚羟基碳氧键	20
碳氢键	1 770	210		15.32
苯环- 氢原子键	80	42
氮氢键		1		0.06
二硫键	1
氧氢键	65		0.01
硫氢键			0.001 5
酚羟基氧氢键	20
分子总键能/ (kJ·mol^-1)	1 604 190.18	241 314.86	9 120.35

分子式及键型	数量
分子式及键型	原始干酪根	残余干酪根		轻质油分子
分子式	C₁₄₃₉H₂₃₆₀O_86.3N_4.3S_1.4	C₃₀₅H₂₅₃O₄N_0.92S_0.92		C₈H_15.4O_0.026N_0.03S_0.015
碳碳单键	1 251	109		5.975
苯环- 碳原子键	40	20
碳碳双键	4			0.7
碳碳三键				0.3
芳键	96	42
碳氮键	12	2		0.03
碳氧键	263	8		0.03
碳氧双键	78			0.01
碳硫键	2	2		0.001 5
酚羟基碳氧键	20
碳氢键	1 770	210		15.32
苯环- 氢原子键	80	42
氮氢键		1		0.06
二硫键	1
氧氢键	65		0.01
硫氢键			0.001 5
酚羟基氧氢键	20
分子总键能/ (kJ·mol^-1)	1 604 190.18	241 314.86	9 120.35

分子种类	占比/%	碳碳单键数	碳氢键数	分子总键能/ (kJ·mol^-1)
甲烷	70		4	1 652.60
乙烷	20	1	6	2 816.38
丙烷	7	2	8	3 980.16
丁烷	2	3	10	5 143.94
戊烷	1	4	12	6 307.72
湿气分子总键能 (kJ·mol^-1)	2 164.66

分子种类	占比/%	碳碳单键数	碳氢键数	分子总键能/ (kJ·mol^-1)
甲烷	70		4	1 652.60
乙烷	20	1	6	2 816.38
丙烷	7	2	8	3 980.16
丁烷	2	3	10	5 143.94
戊烷	1	4	12	6 307.72
湿气分子总键能 (kJ·mol^-1)	2 164.66

键型	键型数量
键型	二氧化碳	氧气	氮气
氧氧双键		1
碳氧双键	2
氮氮三键			1
分子总键能/(kJ·mol^-1)	1 448.38	498.00	946