Advanced Multizone Stimulation Technology

Lonnes, Steve Bruce; Hall, Timothy J.; Nygaard, Kris; Sorem, William A.; Tolman, Randy C.

doi:10.2523/95778-ms

Cited by 6 publications

(2 citation statements)

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“…Additionally, a coil tubing system known as the CT Frac stimulation method relies upon the performance of various operations. In addition to firing the perforating guns and activating the slips, these operations include 1) circulating fluid from the coil tubing to the annulus while the BHA is moved uphole or downhole (without inflating the packer); 2) inflation and deflation of the packer; 3) opening and closing of pressure/flow equalization pathways through the packer at appropriate times during the packer inflation and deflation process to prevent the BHA from being pushed uphole via uphole/downhole cross flow; 4) maintenance of the packer pressure; 5) packer over pressure protection; 6) initiation of wash flow at the end of a stimulation treatment with the packer still inflated (Lonnes 2005).…”

Section: Historical Completion Techniquesmentioning

confidence: 99%

Improved Single-Trip Multistage Completion Systems for Unconventional Gas Formations

Durst

Harris²,

Contreras

et al. 2008

All Days

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Cost-effective development of unconventional gas resources depends upon strategic application of advancing technologies. By employing efficient fracturing techniques with an appropriate multi-stage fracturing completion, operators can achieve higher initial gas rates, increased recovery rates and reduced completion costs. The completion process employs a single-trip multi-stage isolation completion system which is driving the cost-effective exploitation of difficult reservoirs. Operational issues, case studies and system improvements, such as the means to isolate water producing zones, will be covered.Key factors to be reviewed include reserve estimates, selection of number of fractures, production behavior analysis, production forecast analysis, risk analysis, fracture design, and economic evaluation.Installation strategy issues will be addressed regarding equipment and operations such as quantity and spacing of packers and sleeves as well as the fracturing process. These strategies are critical relative to achieving mechanical, volumetric and economic success which is established by the efficiency of each fracture and total gas production rate when compared to initial evaluations.The one-trip multi-stage isolation fracturing completion process reduces rig time and cost for hydraulic fracturing services, accelerates production and improves reservoir drainage. When coupled with effective fracturing strategies and best practice procedures, the system provides improved production from unconventional gas formations. Unconventional FormationsGrowing energy demand coupled with higher depletion rates of existing reserves compared to new discoveries are creating a unwanted supply/demand gap. This gap has driven the need to increase focus on exploration and development of unconventional resources of gas. A large percentage of the world's future energy demands will be fulfilled by unconventional gas resources, with the greatest interest being in tight gas fields. The so-called unconventional natural gases are tight gas, coalbed methane (CBM), shale gas, deep earth gas, geo-pressured gas and methane hydrates (Zahid 2007). In terms of the distribution, North America, the Former Soviet Union and Centrally Planned Asia and China have large resources for CBM, shale gas, and tight sand gas. As for methane hydrate, North America, Latin, America, and the Former Soviet Union have immense resources (Kawata 2001). To produce these resources economically and efficiently, well stimulation plays a major role in achieving the optimal target production form these reservoirs. Unconventional gas reservoirs require the formation to be fractured by hydraulic means to improve the formation productivity by providing a conductive path and joining the existing fractures and cleats in the reservoir (Zahid 2007).Typical problems associated with these types of reservoirs are low permeability and reservoir compartmentalization for tight gas and shale gas and for coalbeds and the finding of suitable permeable coals that contain a large volume of sorb...

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Section: Historical Completion Techniquesmentioning

confidence: 99%

Improved Single-Trip Multistage Completion Systems for Unconventional Gas Formations

Durst

Harris²,

Contreras

et al. 2008

All Days

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“…This technique has been used for multizone fracturing operations while pumping proppant past a perforating gun. 11 The decentralizer arm likely prevented the tool from spinning uncontrollably about its own axis. TABS was positioned above the perforations during pumping and clamped across the perforated intervals for monitoring.…”

Section: Case #4: Treatment-well Job With Upgraded Telemetrymentioning

confidence: 99%

Logging Tool Enables Fracture Characterization for Enhanced Field Recovery

Bailey

Sorem

2005

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractExxonMobil has developed a fracture mapping tool that uses acoustic methods to infer the geometry of induced hydraulic fractures. This tool may be run in the treatment well during fracturing, or it can be used in one or more offset monitoring wells. This tool, "TABS" for Triaxial Borehole Seismic, consists of an array of three triaxial geophone receivers, a telemetry sub to transmit the data to surface in real time on conventional 7-strand wireline, and an interface to a Gyrodata survey tool to provide the tool orientation when clamped. The tool subs are interconnected with "flex links" that are rigid in rotation but flexible in bending to allow each clamp arm to make independent coupling to the wellbore casing. The overall design is that of a logging tool, facilitating application via wellhead lubricators.The geometry of the stimulated fracture has a significant impact on well productivity and recovery.In many applications, the reservoir depletion pattern is highly dependent on this geometry. Some key interactions between productivity and fracture geometry include:• Well spacing is determined by the fracture length, formation properties, and depletion plan.• Within this spacing constraint, well locations are determined by the induced fracture azimuth. Wells are placed to reduce interference among producers and to maximize conformance.• Fracture height growth out of zone may lead to more costly stimulation treatments and lower well productivity.Modifications to the treatment design and adjustments to the selection of perforated intervals may increase well performance.Working with the ExxonMobil Production Company, the TABS tool has been used to monitor 32 fracture treatments in 16 well entries.Results from several of these field applications will be used to describe the TABS technology and to demonstrate fracture geometry measurements.

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Multi-zone stimulation technology

Desai

Jajal

2014

Journal of Unconventional Oil and Gas Resources

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Advanced Multizone Stimulation Technology

Cited by 6 publications

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Improved Single-Trip Multistage Completion Systems for Unconventional Gas Formations

Improved Single-Trip Multistage Completion Systems for Unconventional Gas Formations

Logging Tool Enables Fracture Characterization for Enhanced Field Recovery

Multi-zone stimulation technology

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