Unconventional Resources

Tech Paper: Eagle Ford Horizontal Drilling Optimization in Karnes and DeWitt Counties

Optimized drilling methods lead to increased success rate and reductions in rig time The drilling of Eagle Ford horizontal wells in Karnes and DeWitt counties traditionally requires at least two bottomhole assembly (BHA) configurations to drill from surface casing to reach total depth (TD). After a few initial successful attempts at drilling from surface casing to TD using a single BHA (one-run), several...

Is it Shale or not Shale? That is the Question.

In a previous blog on unconventionals, ”Conventional vs. Unconventional Shale: What is my Reservoir?,” Richard Day wrote about the nontrivial problem of classifying reservoirs as conventional or unconventional formations. I would like to continue this topic, as, in Europe, this issue has made it into the headlines of local newspapers. People in small villages have become “experts” in the field of geology, and...

All Perforations Should Be Treated the Same

Good formation access is the key to expanding stimulated reservoir volume and increasing production from hydraulic fractured, unconventional wells. In Europe, using long perforated intervals for these treatments in tight-gas operations in wells has led to perforation “screenouts.” Higher fluid viscosities in combination with larger pad volumes were often used to avoid these screenouts, as they were thought to be related to the...

Tech Paper: Successful Application of Plug and Hydrajetting Technique during Multistage Fracture for Horizontal Wells with Coiled Tubing

Reducing NPT up to 30%, this Coiled Tubing method allows for continuous completion of fracturing stages This paper presents an alternative for operators regarding tools and methods using coiled tubing (CT) during the implementation of horizontal completions. To help address challenges faced developing horizontal completions, both cemented liners and open holes have been widely used in conventional and unconventional reservoirs. Various completion techniques have...

Tech Paper: Successful Utilization of E-line Tractor in Horizontal, High Pressure and High Temperature Gas Wells

This state-of-the-art technology helps meet the technical objectives of large rigless production enhancement Growing gas resource exploitation in Saudi Arabia has increased activity in drilling deep, high pressure gas reservoirs with marginal to low permeability. Such wells generally require stimulation operations to induce production. To increase the reservoir contact area, a significant number of wells are constructed with long reach horizontal sections. Multistage fracture...

Tech Paper: Completion Design Optimization for Barnett Oil Producing Area

Focus on subsurface insight and collaboration are essential to helping discover and produce more oil and gas Throughout the past several years, economic and technological advancements in the North American shale market with respect to drilling and hydraulic fracturing operations have helped create a “typical” operating scheme for producing from the multiple shale formation reservoirs currently being exploited. This typical scheme focuses on...

Tech Paper: Refracturing Design for Underperforming Unconventional Horizontal Reservoirs

Comparison of different Haynesville shale refracturing design treatments, results, and diagnostics This paper discusses refracturing design considerations to increase the estimated ultimate recovery (EUR) on underperforming wells in a refracturing scenario. A method for, and case histories of, using an environmentally acceptable, self-removing particulate diverter that has proven to be successful in the refracturing efforts of horizontal unconventional reservoirs are provided. This method is...

Tech Paper: Facies Architecture, Channel System and Paleoflow Pattern of a Young Sandstone Reservoir using Borehole Resistivity Images

Integrating resistivity images and openhole logs provides facies architecture to enhance recovery to the optimal production The Miocene age shallow unconsolidated sandstone formation in Kuwait contains viscous oil whose distribution is primarily controlled by depositional facies and their diagenetic modifications. This study integrates core-calibrated resistivity images with openhole logs to obtain high-resolution facies logs with continuous array of oriented depositional structures, facies types,...

Understanding the Right Methods for Evaluating Unconventional Reservoirs

For unconventional reservoirs, it is critical to analyze production data and know the selective productivity of the completed horizons When we think about dynamic reservoir evaluation, the first things that come to mind are traditional pressure transient methods such as wireline formation testers, drillstem testing (DST), pressure buildup (PBU) tests, and conventional or modified isochronal tests. Unconventional reservoirs exhibit unique flow behaviors due...

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