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Lower completion in openhole horizontal well is known to improve oil sweep, aid water control and water shut-off in carbonate reservoir. In a marginal oil field of onshore Abu Dhabi, lower completion is an important role to achieve the long-term recovery and production sustainability. The lower completion candidate selection process for marginal field is unique due to economic indicators are stringent than large field's application. In this paper, we will present an integrated approach of lower completion screening to solve both technical challenges and economic consideration in a green marginal oil field. We incorporated a multi-domain screening approach where findings from comprehensive set of data and analysis are integrated. Multi-level analysis was performed to obtain a weighting factor or indicator for lower completion need per well. The evaluation includes production history, logs, borehole image, reservoir compartmentalization analysis, well trajectory, drilling losses history, surveillance such as pressure transient analysis and production logging and other data. One of the considerations of lower completion is to remove accessibility issue. Indicator was gathered based on historical coil tubing accessibility evaluation and review of well with high dogleg trajectory. Lower completion need for water control is evaluated through multiple analysis such as water conformance analysis and evaluation of preferential communication between producer and injector. The analysis is complemented with study of oil and water influx distribution based on production logging, permeability-thickness log, borehole image interpretation, drilling losses history, and pressure transient analysis. Indicator were also collected per well for potential influx mitigation and water shut off need due to natural fractures and fault. Additionally, reservoir compartmentalization analysis was also performed to identify if horizontal wells are located at multiple compartments and can be benefiting from lower completion. Around 20 wells were included during the study. A standardized matrix scoring and ranking were generated. From the screening result, 12 wells have been selected as best candidates for lower completion deployment. Few wells were selected due to well accessibility issues and trajectory challenges and remaining wells selected due to non-conformance water breakthrough and or due to strong preferential communication with water injector. That candidate was further studied through numerical simulation and subsequently economic indicator were generated to support the decision making and implementation priority. From this study, 3 Pilot implementation of inflow control device complemented with sliding sleeve door mechanism are due for implementation in the near term. In a green field, lower completion candidate screening is a continuous process and will need to be updated when new findings or surveillance are obtained. It may also be adjusted along with evolution of field development plan. The screening practice presented in this paper may be adopted by other asset for an effective lower completion screening study.
Lower completion in openhole horizontal well is known to improve oil sweep, aid water control and water shut-off in carbonate reservoir. In a marginal oil field of onshore Abu Dhabi, lower completion is an important role to achieve the long-term recovery and production sustainability. The lower completion candidate selection process for marginal field is unique due to economic indicators are stringent than large field's application. In this paper, we will present an integrated approach of lower completion screening to solve both technical challenges and economic consideration in a green marginal oil field. We incorporated a multi-domain screening approach where findings from comprehensive set of data and analysis are integrated. Multi-level analysis was performed to obtain a weighting factor or indicator for lower completion need per well. The evaluation includes production history, logs, borehole image, reservoir compartmentalization analysis, well trajectory, drilling losses history, surveillance such as pressure transient analysis and production logging and other data. One of the considerations of lower completion is to remove accessibility issue. Indicator was gathered based on historical coil tubing accessibility evaluation and review of well with high dogleg trajectory. Lower completion need for water control is evaluated through multiple analysis such as water conformance analysis and evaluation of preferential communication between producer and injector. The analysis is complemented with study of oil and water influx distribution based on production logging, permeability-thickness log, borehole image interpretation, drilling losses history, and pressure transient analysis. Indicator were also collected per well for potential influx mitigation and water shut off need due to natural fractures and fault. Additionally, reservoir compartmentalization analysis was also performed to identify if horizontal wells are located at multiple compartments and can be benefiting from lower completion. Around 20 wells were included during the study. A standardized matrix scoring and ranking were generated. From the screening result, 12 wells have been selected as best candidates for lower completion deployment. Few wells were selected due to well accessibility issues and trajectory challenges and remaining wells selected due to non-conformance water breakthrough and or due to strong preferential communication with water injector. That candidate was further studied through numerical simulation and subsequently economic indicator were generated to support the decision making and implementation priority. From this study, 3 Pilot implementation of inflow control device complemented with sliding sleeve door mechanism are due for implementation in the near term. In a green field, lower completion candidate screening is a continuous process and will need to be updated when new findings or surveillance are obtained. It may also be adjusted along with evolution of field development plan. The screening practice presented in this paper may be adopted by other asset for an effective lower completion screening study.
Drilling of long lateral sections enables operators to execute development schemes that require fewer wells with a lower overall carbon footprint. Water injection wells help sustain reservoir pressure and provide sweep to maximize field commercial recovery. A key challenge is to divert the water along the drain length to achieve uniform injection profile. In this paper, we compare different completion and stimulation techniques with special emphasis on wellbore accessibility and injection conformance along the lateral. We first group the wells according to the completion type, which can be either open-hole or cased hole. Cased hole completions are then subdivided into slotted liners, Smart Liners, and completions with zonal control. The type of completion dictates the options available for acid stimulation, which can involve either high-rate bull-heading, coiled-tubing deployed techniques or no stimulation. The analysis of conformance involves injection logging tool results as well as the reported percentage of the wellbore accessible for intervention tools. Most of the existing well stock consists of wells completed open-hole with limited or no stimulation. Abrasive jetting can provide effective stimulation but often deliver a skewed injectivity profile. Bull-heading of acid from surface, on the other hand, is not usually applied in water injectors due to higher stimulation equipment and chemical costs. Furthermore, undulating trajectories can substantially reduce the wellbore accessibility in open-hole completions. Installing a liner improves accessibility significantly. Our analysis of injectivity profile logs shows that a lower completion with zonal compartmentalization provides a more uniform injection profile compared to a barefoot completion. A uniform injection profile is achieved by either ICD (with associated SSD) or Smart Liner Completion. Injectivity data suggest that the pre-and post-stimulation injectivity index is comparable between ICD and Smart Liner Completions, which is not surprising since both techniques rely on the limited-entry principle for fluid diversion. This paper offers a comprehensive comparison of completion-stimulation techniques for carbonate reservoirs and offers some guidelines for selecting a suitable method depending on the well and reservoir characteristics, such as well length, permeability, permeability variation, and anticipated need for future interventions. We also provide results from a simple 2D finely gridded numerical simulation model using a producer-injector pair to illustrate the impact of high permeability streak on early time water breakthrough. Results indicate that blocking the high-streak either at the producer or at the injector leads to similar water-cut evolution. Blocking the interval in both wells from day one is better and blocking a 50ft interval on both sides of the streak is even better.
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