Numerical Simulation of Draining and Expanding of Gas Storage Based on Mechanism Model
1. Research Institute of Liaohe Oilfield, CNPC, Panjin 124010, China
2. School of Earth Resources, China University of Geosciences, Wuhan 430074, China
| Abstract: | There are precedents for the construction of flooded hydrocarbon reservoir into gas storage abroad, but there is no successful experience of the same type of gas storage in China. This paper takes the reconstruction of gas-cap oil reservoir with strong water flooded layer into gas storage in Block M19 of Liaohe Oilfield as an example to carry out numerical simulation research on drainage and expansion of gas storage, so as to solve how to optimize well pattern design and peak timing under the strong water flooding conditions, and to solve the technical difficulties of efficient drainage and gradually form effective gas storage space. This paper by means of gas reservoir numerical simulation technology, establishes a numerical model of drainage and expansion of gas storage by applying the mechanism model. Through a variety of alternatives, discusses the influence of well pattern, horizontal well location, perforating horizon, Injection timing, injection volume and other factors on water discharge and crude oil recovery. And conduct a simulation study of various factors affecting the movement of gas liquid interface and displacement effect. The simulation results show that the cumulative water production, cumulative oil production and final oil recovery are the largest under the conditions of nine-spot pattern, gas injection at the high point of formation, perforation at the upper level of the horizontal well and perforation at the lower level of the vertical well, and the accumulated oil production rate and accumulated water production rate are positively correlated with the gas injection rate. It shows that under this well pattern, the displacement efficiency is higher, the sweep volume is larger, and it is more conducive to air-driven drainage. Gas injection and drainage for 4 months, gas injection and pressure holding for 3 months, equilibrium period for 1 month, gas production for 4 months, nine-spot well pattern, gas injection at the high point of formation, perforation and drainage at the lower level of the production well, after six cycles of circular injection and production, the drainage effect is the best, which can increase the final oil recovery by 5%.The gas injection rate can be increased to 1.2 times within the permitted operating pressure. The research results will further guide the design of efficient drainage construction method for M19 gas storage, which can not only achieve the purpose of gas storage construction, but also improve crude oil recovery and achieve win-win benefits, and provide reference for the construction of similar gas storage. |
| Keywords: | Gas-Cap Oil Reservoir with Strong Water Flooded Layer; Mechanism Model; Gas Storage; Numerical Simulation |
| DOI: | 10.57237/j.jest.2022.01.002 |
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Received: 3 October 2022
Accepted: 7 November 2022
Published Online: 1 December 2022
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