Hongfu Shi
Senior Reservoir Engineer
CNOOC
Hongfu Shi is a senior reservoir engineer (T8) of CNOOC China. He got bachelor's and master's degree from China University of Petroleum (East China).Seven years study has equipped him with the multidisciplinary theories of the oil&gas fields development. From 2012 to 2025，he has been working in Bohai oilfield. He focus on fine reservoir description, development of fluvial reservoirs, adjustment of mature reservoirs with high water cut , distribution of remaining oil, optimization of smart wells, optimization of water injection plans, etc.
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TECHNICAL PROGRAMME | Primary Energy Supply
Advances in Geoscience
Forum 05 | Digital Poster Plaza 1
30
April
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12:00
UTC+3
Horizontal wells are widely used in oilfields because of its high initial productivity, large drainage area and the ability to connect multiple remaining oil rich areas. Mature oilfields in Bohai Bay are facing with the problem of high-water cut 95%, scattered remaining oil, and the thinner potential sand-bodies, which led to challenges in the implementation of horizontal wells. Detailed reservoir description can boost the confidence and success probability of horizontal well drilling. This paper presents a fine reservoir classification method to improve the accuracy of reservoir description in multi-layer sandstone reservoirs.
We have established a workflow for hierarchical reservoir description. Firstly, according to sand thickness, permeability and oil saturation, the sands are divided into three categories: I, II and III.(Fig.1)
For category I -sand thickness 8m~20m which is basically in the critical region seismic resolution 1/4λ , but the internal configuration of the composite sand body is unclear. With the discontinuous interface analysis technology of the accumulated energy of the ant body, the braided river channel can be accurately located. Moreover, by using the discontinuous interface analysis method of the minimum curvature of the root mean square amplitude, the impermeable boundary channels and the internal small channels can be clearly distinguished.(Fig.2)
For category II -sand thickness 4m~8m which is much less than seismic resolution 1/4λ. The waveform indication simulation method is used to predict the reservoir distribution based on the actual acoustic logging curve and seismic waveform matching.(Fig.3)
For category III-sand thickness 1m~4m, the seismic signals only have a certain response to the thin layer groups. Therefore, an intelligent method driven by massive seismic-geological models is used to predict the favorable areas of the thin layer groups.(Fig.3).
A pilot area for tapping potential of mature field with large-scale maximum reservoir contact (MRC)wells has been developed. 53 wells include horizontal-wells, multilateral-wells and multi-bottom wells have been drilled. The initial water cut of new wells is less than30%. F38H1 is the first high inclination horizontal-well in Bohai Bay Basin with 72°hole inclination angle. F10H1 was the first horizontal well drilled in a category II -sand (4m) with a 246m length with an initial oil production of 300 barrels per-day.(Fig.4).
This paper demonstrates a new method to improve the accuracy of reservoir description by means of multidisciplinary collaboration among seismic, logging, geology, and reservoir disciplines. It can not only broaden engineers' horizons and boost the confidence of horizontal wells, but also increase the recovery factor of mature oilfields and serve as a reference for the similar reservoir.
We have established a workflow for hierarchical reservoir description. Firstly, according to sand thickness, permeability and oil saturation, the sands are divided into three categories: I, II and III.(Fig.1)
For category I -sand thickness 8m~20m which is basically in the critical region seismic resolution 1/4λ , but the internal configuration of the composite sand body is unclear. With the discontinuous interface analysis technology of the accumulated energy of the ant body, the braided river channel can be accurately located. Moreover, by using the discontinuous interface analysis method of the minimum curvature of the root mean square amplitude, the impermeable boundary channels and the internal small channels can be clearly distinguished.(Fig.2)
For category II -sand thickness 4m~8m which is much less than seismic resolution 1/4λ. The waveform indication simulation method is used to predict the reservoir distribution based on the actual acoustic logging curve and seismic waveform matching.(Fig.3)
For category III-sand thickness 1m~4m, the seismic signals only have a certain response to the thin layer groups. Therefore, an intelligent method driven by massive seismic-geological models is used to predict the favorable areas of the thin layer groups.(Fig.3).
A pilot area for tapping potential of mature field with large-scale maximum reservoir contact (MRC)wells has been developed. 53 wells include horizontal-wells, multilateral-wells and multi-bottom wells have been drilled. The initial water cut of new wells is less than30%. F38H1 is the first high inclination horizontal-well in Bohai Bay Basin with 72°hole inclination angle. F10H1 was the first horizontal well drilled in a category II -sand (4m) with a 246m length with an initial oil production of 300 barrels per-day.(Fig.4).
This paper demonstrates a new method to improve the accuracy of reservoir description by means of multidisciplinary collaboration among seismic, logging, geology, and reservoir disciplines. It can not only broaden engineers' horizons and boost the confidence of horizontal wells, but also increase the recovery factor of mature oilfields and serve as a reference for the similar reservoir.
