Neog Dhrubajyoti
Department of Petroleum Technology, Dibrugarh University, Assam, 786004, India.
Heliyon. 2023 Jun 27;9(7):e17466. doi: 10.1016/j.heliyon.2023.e17466. eCollection 2023 Jul.
Despite minimal formation damage or water-cut, the majority of oil wells in brown oil fields cease to flow naturally. The current study looks into and analyses what caused a self-flowing well in the upper Assam basin to become non-flowing. The non-flow condition of the well was investigated in the current work as a function of water cut, reservoir pressure, reservoir rock permeability, and GOR. The effect of WHP and WHT on these functions was investigated. This work incorporates innovative methodology that uses the PROSPER simulation model for assessing the possibility of establishing flowability in a dead well based on inflow (IPR) and vertical lift performance (VLP). Subsequent analysis was carried out to examine the scope of producing this dead well under continuous flow gas lift. For this, the current work first examined the tubing diameter and reservoir temperature as standalone parameters to find out if they have any role to play in the flowability of the dead well. Following this, sensitivity analysis was done taking four parameters into account, i.e., reservoir pressure, reservoir rock permeability, water cut, and total GOR. In the current work, surface equipment correlation was established using Beggs and Brill correlation, while vertical lift performance was established using correlation from Petroleum Expert. The results of the current work highlight that a well's production rate under continuous flow gas lift can be enhanced by employing an optimised gas injection rate. The findings of this work conclude that higher reservoir pressure enables an oil well to produce with a high water cut under a continuous flow gas lift system, provided there are no formation damage issues on the well.
尽管地层损害极小或含水率很低，但稠油油田中的大多数油井都停止了自喷。本研究调查并分析了阿萨姆邦上部盆地一口自喷井变为非自喷井的原因。在当前工作中，研究了该井的非自喷状态与含水率、油藏压力、油藏岩石渗透率和油气比的关系。研究了井口流动压力和井口温度对这些关系的影响。这项工作采用了创新方法，即使用PROSPER模拟模型，根据流入动态（IPR）和垂直举升性能（VLP）评估在死井中建立流动性的可能性。随后进行了分析，以研究在连续气举条件下开采这口死井的可能性。为此，当前工作首先将油管直径和油藏温度作为独立参数进行研究，以确定它们是否对死井的流动性有任何影响。在此之后，考虑了四个参数进行敏感性分析，即油藏压力、油藏岩石渗透率、含水率和总油气比。在当前工作中，使用Beggs和Brill关联式建立地面设备关联，而使用Petroleum Expert的关联式建立垂直举升性能。当前工作的结果突出表明，通过采用优化的注气速率，可以提高连续气举条件下油井的产量。这项工作的结果得出结论，在连续气举系统中，只要油井没有地层损害问题，较高的油藏压力能使油井在高含水率下生产。
