Multi-Interval, Horizontal-Completion Strategies Minimize Water Usage and Deliver Increased Production

Palidwar, Troy; Tucker, R. C.; Noble, Vic

doi:10.2118/137442-ms

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…In cases such as this, it is best to run a mill through the well first to clean up some of these potential problems. The treatment design can also limit the use of this method; however, this method has been successfully applied in Canada for applications to reduce the amount of water required for stimulation treatments (Palidwar et al 2010) and has been used internationally since 2001 (Velasquez et al 2009). Depending on the tool size, treatment pressure, differential pressure, bottomhole temperature (BHT), and chemicals to be used, there might not be a packer configuration that is capable of satisfying all requirements.…”

Section: Pinpointmentioning

confidence: 99%

Challenges of Refracturing Horizontal Wells in Unconventional and Tight Reservoirs

et al. 2013

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The use of horizontal wells and multistage fracturing that is currently common in unconventional reservoirs first became popular during the early 2000s. Since then, the effectiveness and efficiency of horizontal wells has continued to be recognized. Because of the large number of these horizontal wells, significant opportunities for refracturing exist. Restimulation of these wells can allow the operator to increase production, as well as recoverable reserves, generally more economically than by installing new laterals or by infill drilling. An important challenge in refracturing these wells is to understand the rock system in which the well and the hydraulic fracture system are placed.The major hurdle for net returns on any restimulation is effective candidate selection. This process involves not only choosing the right well, but also choosing the best zones within that well. Often, either a well (or zone) has not produced adequately or has been prolific and is in decline. However, there is no model that can predict production as accurately from unconventional reservoirs as from conventional ones. There are, however, measurable parameters that, when analyzed together, can indicate the relative potential of one zone to another. Therefore, to perform this analysis, any available data on the reservoir should be gathered. Then, well diagnostics are run to fill in the inevitable gaps in these data.This paper discusses using a novel combination of cased-hole logging tools to gather these data. Using this combination to log the well after the first hydraulic fracturing treatment, the optimum restimulation candidate(s) can be determined. Then, whether to use existing perforation locations or to perforate new areas to cover non-stimulated rock can be decided; thus, optimizing the refracturing process. This selectivity of both candidates and zones during the refracture design can save time, costs, and resources, increasing the economic efficiency of the operation.

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Section: Pinpointmentioning

confidence: 99%

Challenges of Refracturing Horizontal Wells in Unconventional and Tight Reservoirs

et al. 2013

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Two Novel Multistage Fracturing Processes for Unconventional Reservoirs: Unique Approach for Branch-Fracturing Stimulation

Stanojcic

Rispler

2010

SPE Latin American and Caribbean Petroleum Engineering Conference

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Shales, tight-gas reservoirs, and coal beds are the main sources of what are generally known as unconventional oil and gas reservoirs. Unconventional oil and gas are now a core business of many large, independent producers and a growing number of major operating companies. The reservoirs are becoming more complex and well designs are becoming more complicated and costly. The need to develop and commercialize new, more effective wellsite technologies that can help meet the increasing demand for energy, despite the dwindling domestic resource base, has been pursued by many operators. A number of unique technologies and methods have been developed to help operators produce unconventional oil and gas profitably. The objective of this work was to assess each existing stimulation technology and seek ways of combining the best available capabilities into a new stimulation technique capable of setting a new level of multizone-stimulation efficiency and effectiveness. The successful development and exploitation of unconventional reservoirs has relied on innovative technologies, such as horizontal drilling, multistage completions, modern multistage fracturing, and fracture mapping to pursue economic completions. Simulations demonstrate that shale reservoirs with ultralow permeability require an interconnected fracture network of moderate conductivity (branch fractures) with a relatively small spacing between fractures to obtain reasonable recovery factors. In this paper, two new methods and two existing methods for a wide variety of unconventional-reservoir applications are presented, to include:• Fracturing preperforated, cemented horizontal liners, and isolating intervals with straddle packers. (The straddle-packer method has advantages that include the opportunity to fracture stimulate a large number of closely spaced, preperforated intervals in a horizontal well.) • Hydrajet perforating with annular path (HPAP) fracturing with a more efficient method of providing sand-plug diversion.(A new BHA increases efficiencies of current application of this technique.) • Using the HPAP method for high-rate, slickwater techniques. (Using the HPAP method for high-rate, slickwaterfracturing treatments can improve the effectiveness of unconventional-reservoir stimulation.) • Fracturing using a method of mechanically shifted sleeves that use an unconventional approach to interval sequence to maximize fracture-network complexity. • An overview of a newly developed hybrid rig that can extend reach and improve efficiencies for all of the above methods using both jointed and coiled tubing (CT).

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Technology Challenges and Emerging Solutions

Day¹,

Purkis²,

Mason³

et al. 2012

All Days

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Traditional fracture completion systems are often inefficient. They suffer from friction and pressure losses, large hydraulic horsepower requirements, premature openings with frequent screen-outs, and time-consuming multiple downhole operations. A monobore, or a single size ball system with disappearing seats, addresses many of the drawbacks to a traditional fractured completion. By minimizing friction losses and pressure drops, monobore systems increase fracture effectiveness throughout the well while decreasing hydraulic horsepower requirements at the surface by up to 60%. The system delivers higher flow rates, lower stimulation pressures, reduced surface pressures, less equipment, smaller pad sizes and higher safety at less cost. In this paper the authors will describe the design and advantages of a monobore system with one size ball and disappearing seats.

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Multi-Interval, Horizontal-Completion Strategies Minimize Water Usage and Deliver Increased Production

Cited by 3 publications

References 6 publications

Challenges of Refracturing Horizontal Wells in Unconventional and Tight Reservoirs

Challenges of Refracturing Horizontal Wells in Unconventional and Tight Reservoirs

Two Novel Multistage Fracturing Processes for Unconventional Reservoirs: Unique Approach for Branch-Fracturing Stimulation

Technology Challenges and Emerging Solutions

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