Abstract
Well completion is the process of construction a well geared up for production or injection. This mainly involves preparing the bottom of the hole to the required conditions, running the production tubing and associated downhole tools. Production from a multizone well can be obtained from a single tubing string as well as from dual tubing strings but it depends on pressure difference, depth and fluid present in the formation. This paper is based on the optimum well completions design for a multizone well of the Tal block region which contains four reservoirs of different formations: Lockhart (limestone), Hangu and Lumshiwal (sandstone), Samanasuk (limestone) & Datta (sandstone) having pressures of 7432psia, 7563psia, 7843psia, and 7982psia respectively. The well is producing four zones (multilayer well) and the generated numerical model for each completion (single string multizone completion and dual string multizone completion) shows better performance and economic feasibility.
Highlights
Tal Block is an oil and gas field, located in Kohat District, Pakistan
The inflow performance relationship (IPR) curves were generated with the help of the Prosper software, and show the performance of reservoirs of Tal Block and the production from multizone wells
When an IPR curve meets the vertical lift performances (VLPs) curve, the operating point is indicated, which shows that the well will flow
Summary
Tal Block is an oil and gas field, located in Kohat District, Pakistan. The field accounts for 20% of Pakistan's oil production, amounting to 17,000 barrels per day [1]. In Tal block region, four reservoirs can be produced from one well due to low pressure, depth differences between the layers, and similar properties of the fluid present in the formations. The purpose of well completion is to connect the reservoir to the surface so that fluid can be produced or injected securely. The production from a multizone well can be either taken from single tubing string or dual tubing string, depending on the conditions. If the pressure difference is low and fluid compositions are similar, production can be taken from a single tubing string. Intelligent well completion known as smart well completion, which contains inflow control devices and permanent gauges which control the zonal flow and permanent gauges exclude the need of conventional wireline gauges [9]
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