渝东南构造复杂区常压页岩气生产特征及开发技术政策

doi:10.11743/ogg20210119

Abstract

Abstract:

The normal-pressure shale gas reservoirs in some structurally complex areas of southeastern Chongqing is characterized by low pressure coefficient, high proportion of adsorbed gas and complex in-situ stress.Difficulties in forming complex fracture networks in these reservoirs are also frequently experienced during frac operations.Based on the analysis of drilling results and production characteristics of more than 60 horizontal shale gas wells in the areas, we summarized the production law, delineated the production stages, clarified the main factors controlling production capacity, and proposed an optimized technology combination for the reservoir development.It shows that the reservoirs produce mainly fracturing fluids with only a small amount of gas during the initial stage after fracturing and start to yield more gas as the flowback rate of frac fluids increases.At the later stage, gas production gradually stabilizes (depletes slowly) but features relatively high gas production per MPa of pressure drop and limited reserve covered by single wells.The whole production process can be divided into four stages: the liquid (flowback fluid only) stage, transition stage, stable production stage and low-pressure gas drainage stage.The formation pressure coefficient plays a critical role in all of the stages.During the liquid stage, higher pressure coefficient helps to shorten the liquid producing time and to initiate gas production when the flowback rate is still low.In the transition stage, it maintains a longer gas-liquid equilibrium time at lower flowback rate.In the stable production stage, it ensures a stronger gas production capacity that yields more gas with each unit of pressure drop and recover more reserves from a single well.Apart from formation pressure coefficient, the productivity of the reservoirs after fracturing operations is also conditioned by the stimulated reservoir volume (SRV) of frac operations.SRV is in turn controlled mainly by optimal hit ratios of target window, length and orientation of laterals and stimulated areas.Higher formation pressure coefficient and optimal target window drilling rate, longer lateral length, and wider stimulated areas generally signify higher single-well production and more commercially recoverable reserves.Given the above-mentioned understandings, we put forward an optimized technology combination and related fracturing parameters for the normal-pressure shale gas development in the complex areas of southeastern Chongqing.

Key words: production characteristics, factor affecting productivity, optimized development technology, normal-pressure shale gas, Longmaxi Formation, structurally complex area in southeastern Chongqing

CLC Number:

TE321

Xipeng He, Bi Lu, Guisong He, Jianhua Ren, Wei Wang, Zuhua Chen, Yuqiao Gao, Dazhi Fang. Production characteristics and optimized development technologies for normal-pressure shale gas in the structurally complex areas of southeastern Chongqing[J]. Oil & Gas Geology, 2021, 42(1): 224-240.

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类别	评价参数	涪陵地区	南川地区	武隆地区	彭水地区
沉积特征	优质页岩厚度/m	38~40	30~35	32~35	24~25
地化特征	TOC/%	3.0~4.0	3.1~3.6	4.0~5.0	3.0~3.5
地化特征	R_o/%	2.65	2.58	2.62	2.63
岩矿特征	石英含量/%	40~50	45~50	55~65	40~50
岩矿特征	粘土含量/%	25~40	25~40	15~30	20~38
储集特征	孔隙度/%	4.0~6.0	3.5~4.0	4.5~5.0	2.5~3.5
储集特征	裂缝发育情况	高角度缝相对不发育	高角度缝及层理缝发育	高角度缝及层理缝发育	高角度缝及层理缝发育
保存条件	地层压力系数	＞1.50	1.10~1.35	1.05~1.15	0.90~1.10
赋存特征	吸附气占比/%	25~40	40~55	45~60	50~60
应力特征	最大水平主应力/MPa	50~70	50~95	30~70	30~70
应力特征	水平应力差异系数	0.08~0.12	0.10~0.12	0.22~0.25	0.22~0.36

主要指标		压力系数
主要指标		0.9~1.0	1.0~1.1	1.1~1.3	1.3~1.4
地质特征	水平段中深/m	2 000~2 500	2 800~3 300	3 000~3 300	2 800~3 800
压裂改造	水平段长/m	1 000~1 400	1 200~1 500	1 500~2 000	1 600~1 900
	总液量/m³	16 000~21 000	34 000~47 000	43 000~53 000	37 000~43 000
	总砂量/m³	800~1 300	1 200~2 100	2 000~2 400	1 300~1 700
	施工排量/(m³·min^-1)	10~14	14~16	16~18	16~18
试气情况	无阻流量/(10⁴ m³·d^-1)	3~10	7~15	15~30	20~45
试气情况	稳定日产气/(10⁴ m³)	2~3	3~4	4~6	6~10
试采情况	套压5 MPa时累产气/(10⁴ m³)	800~1 500	1 500~2 500	2 500~4 000	4 000~8 000
	套压5 MPa时返排率/%	50~80	25~40	20~25	10~20
	初期年递减率/%	20~25	25~30	30~35	35~45
	单位压降产气量/(10⁴ m³·MPa^-1)	40~60	80~120	120~150	150~240
	EUR/(10⁸ m³)	0.35~0.50	0.50~0.70	0.70~0.90	0.90~1.20

生产阶段	压力系数	0.9~1.0	1.0~1.1	1.1~1.3	1.3~1.4
纯液阶段	生产时间/d	10~15	0~10	< 1	< 1
	日产液量/m³	120~500	90~120	60~90	20~60
	阶段返排率/%	5.0~15.0	2.0~5.0	0.5~2.0	< 0.5
过渡阶段	生产时间/d	>150	50~150	5~10	0~5
	日产气量/(10⁴ m³)	2~3	3~4	4~10	6~10
	阶段返排率/%	15.0~40.0	5.0~15.0	2.0~10.0	0.5~5.0
稳定阶段	日产气量/(10⁴ m³)	2~3	3~4	4~10	6~10
	阶段递减率/%	20~25	25~30	30~40	>40
	单位压降产气量/(10⁴ m³·MPa^-1)	40~60	80~120	120~150	>150
	阶段累产气量/(10⁴ m³)	700~1 000	1 000~2 500	2 500~4 500	4 500~8 000
低压排采阶段	日产气量/(10⁴ m³)	1.0~1.5	1.5~2.0	3.0~5.0	4.0~6.0
	阶段递减率/%	5~10	10~20	20~30	25~35
	单井EUR/(10⁸ m³)	0.35~0.50	0.50~0.70	0.70~0.90	0.90~1.20

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Production characteristics and optimized development technologies for normal-pressure shale gas in the structurally complex areas of southeastern Chongqing

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