Journey of Hydraulic Fracturing Improvement to Increase Oil Recovery from Sandstone Formation in Rimau Block

Priyantoro, Tri A.; Prakoso, Noke Fajar; Kahfie, Rizky Muhammad

doi:10.2118/156550-ms

Cited by 4 publications

(1 citation statement)

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“…In layered sedimentary rocks, opening-mode fractures have been observed to abut against bedding contacts, causing fractures to terminate (abutment) at contacts or step over at bedding contacts (Cooke and Underwood 2001). Microseismic-monitoring technology has been used to study the fracture geometry (Quirk et al 2012;Liu et al 2006;Fischer et al 2008). But these studies do not integrate the fracture-geometry distribution into the reservoir-simulation process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fracture Geometry on Well Production in Hydraulic-Fractured Tight Oil Reservoirs

Lin

Chen

Ding³

et al. 2015

Journal of Canadian Petroleum Technology

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Tight oil production is emerging as an important new source of energy supply and has reversed a decline in US crude-oil production and western Canadian light-oil production. At present, the combination of the multistage hydraulic fracturing and horizontal wells has become a widely used technology in stimulating tight oil reservoirs. However, the ideal planar fractures used in the reservoir simulation are simplified excessively. Effects of some key fracture properties (e.g., fracture-geometry distributions and the permeability variations) are not usually taken into consideration during the simulation. Oversimplified fractures in the reservoir model may fail to represent the complex fractures in reality, leading to significant errors in forecasting the reservoir performance. In this paper, we examined the different fracture-geometry distributions and discussed the effects of geometry distribution on well production further. All fracture-geometry scenarios were confined by microseismic-mapping data. To make the result more reliable and relevant, a geomodel was first constructed for a tight oil block in Willesden Green oil field in Alberta, Canada. The simulation model was then generated on the basis of the geomodel and history matched to the production history of vertical production wells. A horizontal well was drilled in the simulation model, and different fracture-geometry scenarios were analyzed. Results indicated that the simulation results of simple planar fractures overestimated the oil rate and led to higher oil recoveries. In addition, if the secondary fracture can achieve the same permeability as the main fracture, a hydraulic fracture with branches can increase the well production (e.g., Scenario 2 under the conductivity ratio of 1:2) because of a larger effective contact area between matrix and fracture. Secondary fractures with low permeability can decrease the well productivity compared with wells with biwing planar fractures. Furthermore, the effect of hydraulic-fracture geometries on the cumulative production of the wells with higher main-fracture conductivity was more significant compared with those with lower main-fracture conductivity.

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Section: Introductionmentioning

confidence: 99%

Effect of Fracture Geometry on Well Production in Hydraulic-Fractured Tight Oil Reservoirs

Lin

Chen

Ding³

et al. 2015

Journal of Canadian Petroleum Technology

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Utilization of Excess Flared Gas from Gas Lift System as a Gas Injection -An Innovative Method to Reduce Emissions and to Save Energy

2012

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Kaji-Semoga fields in South Sumatra, Indonesia, are oil fields with a gas lift population of almost 50%. Since there is no gas source available in Kaji-Semoga fields, both the gas lift and fuel system are dependent on produced gas from oil producing wells. Based on an overall review of the gas lift system, the flare is inefficient. Pressure Control Valve (PCV), which controls the flare, is opened when the gas lift pressure reaches 815 psig, yet only 800 psig is needed for a normal operation. The gas lift pressure usually exceeds 815 psig, hence gas is flared. On the other hand, compressor suction often drops below the safety level. To overcome this problem, KS-X (Telisa gas cap) is produced around 1-2 MMSCFD. The production of Telisa gas cap has a very negative impact on this formation, causing a decrease in reservoir pressure of 60% in just 4 years. Since Telisa reservoir pressure has depleted from 900 psig to 400 psig, it is easy to inject excess gas from the flaring system. PCV is added to the gas lift system and is set at 805 psig to open. The current gas lift line at KS-X has also been modified to be able to inject the excess gas to the well via the installed gas lift valve. Based on the daily record, the injection system is able to save flared gas and reduce produced gas from Telisa Kaji by up to 1 MMSCFD. Both gas lift system and compressor suction pressure are also relatively more stable after injection. It is concluded that the recycle-injection system is a proven and practical method to use in mature fields where there is no gas reservoir available as a fuel source. The system is able to save up to 1 MMSCFD of flared gas worth $8,000 per day (based on the local market gas price).

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Fractured Reservoir Modeling: Effects of Hydraulic Fracture Geometries in Tight Oil Reservoirs

Lin

Chen

et al. 2014

Day 2 Wed, February 26, 2014

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Tight oil production is emerging as an important new source of energy supply and has reversed a decline in U.S. crude oil production and Western Canadian light oil production. At present, combination of the multistage hydraulic fracturing and horizontal wells has become a widely used technology in stimulating tight oil reservoirs. However, the ideal planar fractures used in the reservoir simulation are excessively simplified. Effects of some key fracture properties, such as facture geometry distributions and permeability change, are usually not taken into consideration during the simulation. Over simplified fractures in the reservoir model may fail to represent the complex fractures in reality, leading to significant errors in forecasting the reservoir performance. In this paper, we examined the different fracture geometry distributions and further discussed the effects of geometry distribution on well productions. All fracture geometry scenarios are confined by the microseismic mapping data. To make the result more reliable and relevant, a geo-model was first constructed for a tight oil block in Willesden Green oil field, AB, Canada. The simulation model was then generated based on the geo-model and history-matched. A horizontal well was drilled in the simulation model and different fracture geometry scenarios were analyzed. Results indicate that the simulation results of simple planar fractures overestimate the oil rate and lead to relatively higher oil recoveries. In addition, the effect of hydraulic fracture geometries under the higher fracture conductivity is more significant compared to those under lower fracture conductivity.

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Journey of Hydraulic Fracturing Improvement to Increase Oil Recovery from Sandstone Formation in Rimau Block

Cited by 4 publications

References 0 publications

Effect of Fracture Geometry on Well Production in Hydraulic-Fractured Tight Oil Reservoirs

Effect of Fracture Geometry on Well Production in Hydraulic-Fractured Tight Oil Reservoirs

Utilization of Excess Flared Gas from Gas Lift System as a Gas Injection -An Innovative Method to Reduce Emissions and to Save Energy

Fractured Reservoir Modeling: Effects of Hydraulic Fracture Geometries in Tight Oil Reservoirs

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