Successfully Planning Horizontal Well Completions Using Advanced Workflows in a Tight Gas Reservoir in the Sultanate of Oman

Briner, Andreas; Moiseenkov, Alexey; Nadezhdin, Sergey; Zeidi, Omar Al; Batmaz, Taner

doi:10.2118/173611-ms

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…3. Cluster location was selected with the use of an advanced reservoir evaluation workflow (Briner et al 2015). The position of the clusters in the lateral was selected based on the stress profile in such way to breakdown the bottom cluster in stage 3, cluster 5, first.…”

Section: Hydraulic Fracturing and Monitoring Setupmentioning

confidence: 99%

Microseismic Monitoring Reveals Hydraulic Fracture Development in Clustered Horizontal Well Completed in High-Temperature Tight Gas Reservoir, Sultanate of Oman

et al. 2015

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Since 2012, Petroleum Development Oman (PDO) has attempted several hydraulic fracture monitoring (HFM) evaluations in deep, high-temperature, tight gas wells in the Amin Formation of the Fahud salt basin. The first successful job was executed in late 2014 for treatments placed in a horizontal wellbore. Following this job, in-depth HFM analyses were conducted that led to recommendations on well completion and fracturing treatment improvements. The purpose of the HFM trial in this challenging tight gas Amin reservoir of the Fahud salt basin was evaluating hydraulic fracture geometries, fracture propagation, and orientation. The horizontal well had been purposely drilled in the vicinity of an earlier completed vertical well to enable execution of the HFM job. Microseismic monitoring provided a direct measurement of the rock-failure coordinates and helped in gauging the effectiveness of the hydraulic fracture treatment placed in two clusters of the same fracturing stage. A large set of raw data representing 52,000 triggers was recorded and processed through different filtering methods including processing noise generated from gas flow in the monitoring well behind the casing. The evaluation suggested that the fractures have grown upward. It also revealed fracture length dimensions and stimulated reservoir volume along with the previously unmeasured fracture azimuthal orientation. The HFM job provided insight on how the hydraulic fractures propagate when two perforation clusters are placed in different stress zones, and if it is possible to place comparable hydraulic fractures in both. HFM results were coupled with geomechanics work and post-fracturing production logging to develop recommendations for future well completion improvements.

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Section: Hydraulic Fracturing and Monitoring Setupmentioning

confidence: 99%

Microseismic Monitoring Reveals Hydraulic Fracture Development in Clustered Horizontal Well Completed in High-Temperature Tight Gas Reservoir, Sultanate of Oman

et al. 2015

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Pressure Drop Calculation Models of Wellbore Fluid in Perforated Completion Horizontal Wells

Li¹,

Lü²,

Peng³

et al. 2016

IJHT

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Perforated completion is a main method of horizontal well completion. Based on the mass conservation equation, the momentum conservation equation and the variable mass flow in the horizontal wellbore, pressure drop calculation models of the wellbore fluid are established in perforated completion of horizontal wells. The results of calculation and analysis show that the frictional pressure drop, acceleration pressure drop and mixing pressure drop have different effects on total pressure drop of the wellbore fluid, and the frictional pressure drop plays a major role while the acceleration pressure drop and mixing pressure drop have little influence. The liquid viscosity, production and horizontal wellbore length also have different effects on various kinds of pressure drop. When liquid viscosity is smaller and the length of the horizontal wellbore is shorter, the effects of the acceleration pressure drop and mixing pressure drop cannot be neglected. The theoretical basis and the calculation model of the variable mass flow pressure drop of horizontal wellbore are provided.

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An Advanced Workflow for Determining Fracture Geometry in Complex, Tight Oil Formations in the Sultanate of Oman

Atanayev¹,

Nadezhdin

Zeidi

et al. 2016

Day 2 Wed, January 27, 2016

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Exploration drilling indicated that the Natih B formation in Oman may have a significant amount of oil locked in a challenging low-permeability, laminated, carbonate reservoir. The first completed vertical wells suggested that stimulation treatments were required for economic production. The operator applied acid fracturing stimulation techniques to establish baseline production. To further improve well performance, proppant fracturing stimulations were scheduled for several vertical and horizontal wells. Mechanical earth models were constructed to help improve understanding of fracture geometry. The earth models revealed stress inversion between layers, differentiating stress regimes into strike-slip and thrust. Areas of different stresses within the same formation would lead to different hydraulic fracture shapes (e.g., regular planar fractures in the case of strike-slip mode or horizontal fractures in the case of thrust mode). Predicting these geometries would impact the fracture design and completion strategies. In addition, the pay zone was bounded by water-bearing zones at the top and bottom, introducing a risk of water production if any of the wells exhibited excessive fracture-height growth. Several measures helped survey fracture-height extension during initial diagnostic treatments. In the formation's first horizontal well, uncertain stress regimes and lateral unconformities, such as natural fractures, complicated the hydraulic fracturing treatments. To overcome these uncertainties and optimize stimulation, we needed to accurately model natural and hydraulic fracture interaction. A mechanical earth model from vertical wells in the vicinity, and the horizontal wellbore itself, were combined with natural fracture network data and the staging and perforation design.

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Successfully Planning Horizontal Well Completions Using Advanced Workflows in a Tight Gas Reservoir in the Sultanate of Oman

Cited by 6 publications

References 4 publications

Microseismic Monitoring Reveals Hydraulic Fracture Development in Clustered Horizontal Well Completed in High-Temperature Tight Gas Reservoir, Sultanate of Oman

Microseismic Monitoring Reveals Hydraulic Fracture Development in Clustered Horizontal Well Completed in High-Temperature Tight Gas Reservoir, Sultanate of Oman

Pressure Drop Calculation Models of Wellbore Fluid in Perforated Completion Horizontal Wells

An Advanced Workflow for Determining Fracture Geometry in Complex, Tight Oil Formations in the Sultanate of Oman

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