Combined Huff-and-Puff With Oxygen-Reduced Air and Nano-Sized Oil Displacement Agent for Horizontal Well Depletion-Drive Development in Ultra-Low Permeability Reservoirs

doi:10.7657/XJPG20260410

Abstract

Abstract:

CO₂ huff-and-puff is considered as the most promising and effective enhanced oil recovery technique for depletion-drive development of ultra-low permeability reservoirs. Nonetheless, due to the limitations such as injection modes, gas costs, and safety/environmental concerns, it is urgent to find new huff-and-puff strategies for horizontal well depletion-drive development of these reservoirs. The alternating injection of nano-sized oil displacement agent and oxygen-reduced air not only leverages the oil displacement mechanisms of nanoparticles and gas, but also generates a distinctive synergistic effect. In this study, laboratory experiments were conducted to evaluate the oil displacement mechanisms of oxygen-reduced air and nano-sized oil displacement agent, and molecular simulation was employed at the microscopic level to investigate the synergistic effect of the combined huff-and-puff with oxygen-reduced air and nano-sized oil displacement agent. Then, reservoir engineering methods and numerical simulations were adopted to optimize key parameters including huff-and-puff timing, injection volume, injection rate, and soaking time. Finally, field tests were performed at horizontal wells C-H1 and D-H2 in the Z area. The tests revealed a cumulative incremental oil production of 4,526.7 tons and an input-output ratio exceeding 1∶2.5, demonstrating satisfactory huff-and-puff and displacement performance. The proposed combined huff-and-puff with oxygen-reduced air and nano-sized oil displacement agent provides a practical guidance for late-stage energy replenishment in horizontal well depletion-drive development of ultra-low permeability reservoirs.

Key words: ultra-low permeability reservoir, depletion-drive development, oxygen-reduced air, nano-sized oil displacement agent, combined huff-and-puff, displacement, field test

CLC Number:

TE348

LI Gang, MENG Baofeng, JIA Zhiwei. Combined Huff-and-Puff With Oxygen-Reduced Air and Nano-Sized Oil Displacement Agent for Horizontal Well Depletion-Drive Development in Ultra-Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2026, 47(4): 466-471.

Figures/Tables 6

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发泡体积/倍	发泡体积标准/倍	评价结果
520	≥350	合格
780	≥350	合格
800	≥350	合格

稳泡剂浓度/%	析液半衰期/s	半衰期指标/s	评价结果
0.5	280	≥320	不合格
1.0	460	≥320	合格
1.5	490	≥320	合格

黏度/ mP·s	渗透率/ mD	水驱采收率/%	水驱后纳米驱油剂驱油采收率/%	提高采收率/%
25	2.5	53.33	70.00	16.67
	25.0	52.35	70.45	18.10
	250.0	52.35	66.47	14.12
	2 500.0	55.47	67.19	11.72
100	2.5	47.62	62.12	14.50
	25.0	47.50	63.75	16.25
	250.0	50.00	63.75	13.75
	2 500.0	49.41	62.35	12.94

段塞	C-H1水平井					D-H2水平井					备注
	配液用水/ m³	化学药品用量/kg			减氧空气/m³	配液用水/ m³	化学药品用量/kg			减氧空气/m³
	配液用水/ m³	发泡剂	稳泡剂	纳米驱油剂	减氧空气/m³	配液用水/ m³	发泡剂	稳泡剂	纳米驱油剂	减氧空气/m³
预处理段塞	200			10		200			10
前置泡沫段塞	50	750	500	131	5 200	50	750	500	115	5 250	气液比为1∶1
泡沫段塞	2 573	38 595	25 730	131	267 592	2 263	33 945	22 630	115	237 615	气液比为1∶1
注气段塞					249 742					219 398	气驱
后置液	20					20					顶替液

井名	分类	水平段长度/m	含油砂岩段长度/m	油压变化/MPa	日增油量/t	有效期/月	累计增油量/t
C-H1水平井	注入井	1 177	1 109.0	+5.6	4.6	477	980.0
D-H2水平井	注入井	1 135	1 135.0	+6.7	5.1	477	888.9
Z23井	周边受效井	1 123	1 090.0	+3.2	4.6	517	477.9
Z23-H1水平井	周边受效井	1 184	1 024.0	+3.8	10.4	546	801.0
Y63井	周边受效井	123	7.6	+4.2	3.5	551	823.4
ZH22井	周边受效井	769	354.0	+2.5	6.5	326	555.5