Gharavi, Amir;
Mohamaed, Hassan;
Ghoochaninejad, Hesam;
Kenomore, Michael;
Fianu, Hohn;
Shah, Amjad;
Buick, Hames;
(2022)
Rejuvenation of a Mature Tight Sandstone Oil Reservoir through
Multistage Hydraulic Fracturing: A Case Study of a North African
Basin.
Journal of Petroleum Geomechanics
, 4
(3)
pp. 50-70.
10.22107/jpg.2021.215847.1115.
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Abstract
Development of mature oil fields has been increasingly attractive in recent years as a significant amount of world oil and gas production is being extracted from these formations. Hydraulic fracturing (either as a selective corrective stimulation method or as a preliminary completion approach) is a well-established technique in mature oil field rejuvenation to improve productivity and deliverability of such a diminishing field. After many years of successful production in A1 and A2 reservoirs, A3 and A4 reservoirs were developed with only one hydraulically fractured vertical well (Well #1). As the production from well #1 in A3/A4 reservoirs was below the expectation, the well was shut down after 3 years of production. Therefore, the main objective of this research paper is to investigate re-development options for A3/A4 reservoirs due to the low deliverability and productivity of the vertical well #1. Sensitivity analysis for history matching, critical conductivity, and optimum dimensionless fracture conductivity (Cfd) was performed followed by forecasting and multistage hydraulic fracturing. Numerical results showed that there is a critical conductivity beyond which production is insensitive to the conductivity, for a specific propped length and production time. Results also showed that critical conductivity increased with propped length and decreased with production time. After 25 years of forecasting, the recovery factor for the 900m lateral with eight fractures and 110m spacing was the highest at 2.65%. The corresponding values for the 300m and 600m laterals were 2.37% and 2.42%. Therefore, the study suggests that horizontal wells with a longer length and optimized number of fractures and spacing will provide maximum well recovery.
| Type: | Article |
|---|---|
| Title: | Rejuvenation of a Mature Tight Sandstone Oil Reservoir through Multistage Hydraulic Fracturing: A Case Study of a North African Basin |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.22107/jpg.2021.215847.1115 |
| Publisher version: | https://doi.org/10.22107/jpg.2021.215847.1115 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Unconventional Resources, Mature Field, Tight Sandstone, Multistage Hydraulic Fracturing, Fracture Conductivity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10187772 |
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