Modeling fracturing pressure parameters in predicting injector performance and permeability damage in subsea well completion multi-reservoir system

Abstract

The significance of fracturing parameters which are aquifer integrity, rock properties, thermal stress, fracturing pressure and produced water quality to alter permeability damage, cake formation and injectivity performance was highlighted in a robust improved internal filtrationhydraulic model and permeability reduction model incorporating a R AT ðcÞ function. The studied system is an injection well multi-reservoir formations. Field data obtained from the log and field reports and improved model were used to simulate injector, fracturing and permeability damage performance. Thus, data requirements in the R AT ðcÞ function which are rock properties, water quality, aquifer integrity, fractures rates and pressures parameters were assessed for its impact on injector performance and permeability damage simulated in MATHLAB and COMSOL multi physics environment. The profile of injector performance and damage reservoir permeability to changes in rock properties and aquifer integrity were demonstrated to have a profound influence on both fracturing phenomena. Thus, sustainable re-injection scheme was shown as a direct consequence of rock mechanics parameters, well hydraulics aquifer integrity that largely depends on the initial concentration of active constituents of the produced water as well as physic-chemical properties of the host aquifer.

A virtual autodesk-simulink reference plant for wastewater treatment

“…The reference plant was simulated with collected data. Its results were validated by [8], in line with [12]. Figure 9 shows a sample outcome of stagewise water treatment as processed by the reference plant.…”

“…In the grit chamber, the governing equations transform grit concentration from its value when water enters the chamber to the outflow value. For sustainability, at this stage, sand concentration should be optimum [12], and its relationships with the performance of aeration sub system are indicated in Figure 6. However, the primary objective of aeration is to separate wastes that are denser than water by pumping sufficient amount of air via the orifice/shower cap.…”

New Mathematical Technique for Step Rate Test Analysis Aids Determination of Fracture Pressure and Overcomes the Uncertainty of Conventional Analysis

“…It becomes increasingly challenging to sustain successful long-term matrix injection as injection water quality cannot be maintained rigorously due to facility hiccups, membrane clogging, source of water, , and other management factors, leading to near well bore plugging . Around the globe, most oil field operators have resolved this problem of injectivity decline by increasing the surface injection pressure to part the formation and inject above fracture gradient, , with strict offtake management for zonal conformance. ,− This is challenging as injection much above fracture opening pressure can lead to water fingering and poor sweep, resulting in uneconomical waterflood recovery. The operators thus strive to inject at a pressure so that the reservoir fractures, which is the fracture opening pressure (FOP) and then maintains the pressure just above the fracture closing pressure (FCP).…”