E&P Case Study: Impact of Autonomously Controlling Injection Fluids Conformance

Tendeka and Petroleum Expert performed an extensive dynamic reservoir simulation study evaluating the impact of pressure, temperature and flow variations of injection fluids on the performance of injection wells with various completions.

(Source: Hart Energy, Tendeka, Shutterstock.com)

Editor’s note: this is an abridged version of SPE-200177-MS, which was presented at the SPE Conference at Oman Petroleum & Energy Show, 21-23 March 2022, Muscat, Oman.

The change in the injectivity of an injection well could result from several phenomena that alter initial reservoir properties, especially near-wellbore conditions. Above all, the development of thermal fractures and/or dilating natural fractures’ apertures pose significant impacts on injection well performance and subsequently, conformance of the injected fluid.

To increase water/polymer flooding performance and eventually, field oil recovery, several techniques have been applied to improve fluid conformance of injection wells. Several operators have used conventional passive nozzle-type outflow control devices (OCDs) or inflow control devices (ICDs), while others have used more flexible, complex interval control valve completion options (References 1-3).

Tendeka developed FloFuse, an autonomous OCD (AOCD) that freely chokes the injection fluid into the propagating fractures crossing the well to maintain a balanced/prescribed injection distribution. Figure 1 shows the AOCD installed along with the lower completion string in horizontal/vertical injection wells.

To find the optimum completion design and demonstrate its added value, Tendeka and Petroleum Expert Ltd. performed an extensive dynamic reservoir simulation study. This evaluated the impact of pressure, temperature and flow variations of injection fluids near the wellbore on the performance of injection wells completed with various completions. To understand the initiation and propagation of fractures, the dynamic reservoir matrix conditions were coupled with a finite element solution of fracture mechanics and the injection well model to simulate the impact of the thermal fractures.

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