TOPICS OF INTEREST
Diagnostic Tool Identifies Factors in Well-Productivity Decline
Wells in deepwater reservoirs show significant rate decline with time as the result of various causes. A diagnostic tool for quantification of factors influencing well-productivity decline is presented in this paper.
Test Methodology Optimizes Selection of Fluids for Gasfield Development
For the development of the Dvalin high-pressure/high-temperature (HP/HT) gas field in the Norwegian Sea, a completion scheme using standalone screens is planned.
One of the frustrating aspects of well-productivity analysis is identifying the causes of lower-than-expected production/injection during initial well lifetime. Our task is to evaluate the multivariate aspects of well design.
Integrated Approach Identifies Formation Damage in Unfavorable Conditions
The success of water-conformance operations often depends on clear identification of the water-production mechanism. Such assessment can be complicated significantly when formation damage is also occurring.
Study Investigates Formation Damage Induced by Water Reinjection in Unconsolidated Sands
This paper describes a coreflooding program performed with sandpacks at different permeabilities, water qualities, and injection conditions.
Flow-Simulation Model Improves Analysis of Perforated-Rock Cleanup and Productivity
Because of inherent complexities, understanding the characteristics of perforations in downhole environments is a significant challenge. Perforation-flow laboratories have been used to provide insight into cleanup and productivity mechanisms around perforation tunnels.
Study of Carbonate Reservoirs Examines Fines Migration in CO2-Saturated-Brine Flow
A high-carbon-dioxide (CO2) carbonate gas field offshore Sarawak, Malaysia, is scheduled for development. Reservoirs in this region have an average clay content of 8%; more than 50% of this clay content is migratory illite, and 15% is migratory kaolinite.
Formation damage: Do we always need to have a high focus on its prevention, or do occasions exist when it really does not matter?
Chemical Stimulation at a Heavy-Oil Field: Key Considerations, Work Flow, and Results
This paper presents the planning and execution of a matrix-stimulation pilot project in the heavy-oil Chichimene Field in Colombia.
Coreflooding is one of the principal tools through which we qualify drilling and completion fluids and assess the potential for formation damage, but is it relevant? By “relevant,” I mean does it give an accurate portrayal of the likely performance of the selected fluids.
Maintaining Injectivity of Disposal Wells: From Water Quality to Formation Permeability
An extensive laboratory study was carried out with two objectives: to evaluate the effect of water quality on injectivity of disposal wells with reservoir core plugs and to restore injectivity of damaged wells.
Modeling of Production Decline Caused by Fines Migration in Deepwater Reservoirs
The complete paper presents a numerical work flow to simulate the effect of flow-induced fines migration on production decline over time in deepwater reservoirs.
New Methods Analyze Asphaltene Deposition and Fouling in Reservoirs
Asphaltene precipitation and deposition in production tubing and surface facilities are well-documented issues, and different methods are available to manage them.
Formation Damage: A Novel Approach in Evaluating Zonal-Productivity Loss
The paper describes a novel methodology to construct distributed formation damage across openhole wells in carbonate reservoirs and to evaluate the effects of damage on zonal productivity.
Removing Fines-Migration Formation Damage in the Putumayo Basin in Colombia
This paper summarizes a wide variety of sandstone-acid-stimulation case histories, highlighting aspects such as mechanical conditions and operational practices.
Integrated Approach To Managing Formation Damage in Waterflooding
Understanding of formation damage is a key theme in a waterflood project. An integrated multidisciplinary approach is required to determine an optimal design and strategy.
One of the challenges for those involved with understanding an unexpected decline in well performance is identifying the exact causes for the reduced productivity. Consideration of all data available can eventually point toward one factor that could explain productivity decline.
Method for Monitoring Mud Contamination in Wireline-Formation-Tester Sampling
The wireline formation tester (WFT) is a well-developed technology used to collect representative downhole fluid samples. The authors introduce a simple but effective method for monitoring WFT sampling when targeting the low levels of contamination needed for asphaltene-onset-pressure analysis.
Filtrate and Mudcake Characterization: Implications for Formation-Damage Control
This paper focuses on experimental methods quantifying water-based muds and investigating effects on particle bridging, filtrate invasion, and permeability.
Does formation-damage coreflooding give a good representation of damage that occurs downhole? For those of us who are actively involved in coreflooding, this is a common question to be asked.
Controlling Losses When Recompleting Low-Pressure Reservoirs
A challenge in many permeable, water-sensitive, subhydrostatic reservoirs is avoiding the loss of completion fluid when completing or working over wells.
Formation-Damage Diagnosis Facilitates Successful Remediation in Sandstone
Well-control fluids were used during a routine overbalanced workover operation in an offshore well completed in high-permeability sandstone.
Modeling Formation Damage and Completion Geometry in the Gyda Reservoir
This study concerns the mature Gyda reservoir, where some recent production wells have underperformed relative to equivalent initial wells.
In order to avoid some of the detrimental effects of formation damage, a key aspect is laboratory testing of representative core material under representative downhole conditions.
Improving the Interpretation of Formation-Damage Laboratory Tests
The paper presents a new approach that uses X-ray-microcomputed-tomography (micro-CT) scanning to produce high-resolution data of entire core samples.
Fines Migration in Fractured Wells: Integrating Modeling With Field and Laboratory Data
Production and drawdown data from 10 subsea deepwater fractured wells have been modeled with an analytical model for unsteady-state flow with fines migration.
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22 July 2020
23 July 2020