TY  - EJOU
AU  - Wang, Meng 
AU  - Yao, Jun 
AU  - Fan, Dongyan 

TI  - Analysis	of	Production	Dynamics of	Fractured	Horizontal	Well with	CO<sub>2</sub> Huff and	Puff	in	Shale	Reservoirs
T2  - The International Conference on Computational \& Experimental Engineering and Sciences

PY  - 2023
VL  - 26
IS  - 2
SN  - 1933-2815

AB  - In	 view	 of	 the	 current	 situation	 of	 the	lack	 of	 suitable	 calculation	models	 for	 the	analysis	 of	production	
dynamics	of	fractured	horizontal	well	with	CO<sub>2</sub> huff	and	puff	in	shale	reservoirs，based	on	the	process	and	
mechanism	of	CO<sub>2</sub> huff	and	puff,	an	analytical	model	for	the	production	dynamics	of	fractured	horizontal	
well	with	CO<sub>2</sub> huff	and	puff	in	shale	reservoirs	was	proposed,	in	which	took	into	account	the	changes	in	crude	
oil	viscosity	and	volume	caused	by	the	difference	in	CO<sub>2</sub> concentration	at	different	locations	in	the	formation	
after	 soaking	 and	 the	 adsorption	 and	 desorption	 process	 of	 CO<sub>2</sub> in	 the	 shale	 matrix.	 The	 solution	 was	
performed	 by	 Laplace	 transform	 and	 the	 factors	 affecting	 pressure	 and	 production	 rate	 during	 the	
production	of	 fractured	horizontal	well	with	CO<sub>2</sub> huff	and	puff	were	analyzed.	The	results	show	 that	 the	
seepage	 flow	 of	 fractured	 horizontal	 well	 with	 CO<sub>2</sub> huff	 and	 puff	 included	 seven	 flow	 stages:	 wellbore	
storage,	hydraulic	fracture	radial	flow,	hydraulic	fracture	linear	flow,	laminar	fracture	to	hydraulic	fracture	
flow,	matrix	to	laminar	fracture	unsteady	flow,	two-three-four	zone	transition	flow,	and	boundary	control	
flow;	bedding	fracture	had	a	significant	effect	on	pressure	and	production	early,	and	the	greater	the	inflow	
capacity,	the	smoother	the	pressure	derivative,	the	higher	the	production	rate;	the	greater	the	amount	of	
CO<sub>2</sub> adsorbed	in	the	matrix,	the	slower	the	pressure	front	propagates,	the	lower	the	required	differential	
pressure,	the	greater	the	production	rate	of	fractured	horizontal	well,	and	the	longer	the	stable	production	
time;	 the	 CO<sub>2</sub> diffusion	 coefficient	 mainly affected	 the	 flow	 of	 bedding	 fracture	 and	 matrix	 to	 bedding	
fracture,	 the	 larger	 the	 diffusion	 coefficient,	 the	 smaller	 the	 differential	 pressure	 required	 for	 constant	
production,	and	the	larger	the	production	rate;	with	the	increase	of	throughput	rounds, the	production	rate	
of	fractured	horizontal	well	increased,	but	the	increase	decreased.
KW  - Shale	oil;	fractured	horizontal	well;	CO<sub>2</sub> huff	and	puff;	concentration	distribution;	analytical	model

DO  - 10.32604/icces.2023.08913