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ISSN Печать: 1091-028X
ISSN Онлайн: 1934-0508
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PERFORMANCE ANALYSIS MODEL FOR MULTISTAGE FRACTURING HORIZONTAL WELL IN SHALE GAS RESERVOIR BASED ON COUPLED MECHANISMS
Краткое описание
Not only can multistage fracturing horizontal well technology activate the natural fracture system defined as stimulated reservoir volume (SRV) but it can also connect the remaining region similarly defined as unstimulated reservoir volume (USRV). In this article, a new performance analysis model for multifractured horizontal wells considering coupled mechanisms, including desorption, viscous flow, stress sensitivity, and dual-depletion mechanisms, is established, originally based on the assumption that the SRV zone and USRV zone are simplified, respectively, as cubic triple-porosity and slab dual-porosity media. Different flow regimes can be identified using related type curves. The whole flow process can be divided into eight regimes: linear flow in SRV, bilinear flow, pseudo-elliptic flow, dual interporosity flow, transition flow, linear flow in USRV, pseudo-interporosity flow, and boundary-dominated flow. The stress sensitivity has a negative influence on the whole production period. The less the value of Langmuir volume and the larger the value of Langmuir pressure, the more late the interporosity flow and boundary-dominated flow occur. It is concluded that the USRV zone enhances production and cannot be ignored when the reservoir properties reach certain values. Numerical simulation and two real field cases are selected to validate the proposed new model and show promising application.
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Ren Junjie, Guo Ping, A general analytical method for transient flow rate with the stress-sensitive effect, Journal of Hydrology, 565, 2018. Crossref