Pushing the Limits for Field Development

Hoch, Esbern; Ohrt, Henrik Bjerre; Brink, David Ian; Flikkema, Johan; Norman, Rashed

doi:10.2118/138301-ms

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…The predominant types of wells drilled by Maersk Oil in Qatar are horizontal, with very long reach reservoir sections (Thomasen et al 2005, Hoch et al 2010). The bulk of the data presented in this paper is based on the most recent, uncompensated processing alogithm.…”

Section: Data Validation Processmentioning

confidence: 99%

Sourceless Neutron-Density Porosity Determination: Fit-for-Purpose Formation Evaluation with Significant HS&E Benefits

Gjerdingen

Hilton

Bounoua

et al. 2012

SPE Annual Technical Conference and Exhibition

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Chemical radioactive sources are commonly deployed in logging-while-drilling (LWD) assemblies to measure formation bulk density and neutron porosity. These measurements are widely used in porosity evaluation, lithology determination, clay volume estimates and fluid identification. Deploying logging tools with chemical sources poses Health, Safety and Environment (HS&E) risks requiring specific procedures throughout the entire process of planning, logistics and execution of well construction. Obtaining similar, identically equal or better formation bulk density and neutron porosity measurements without chemical sources has many advantages, particularly from the HS&E perspective in both standard and high-risk developments. Advances in LWD technology have enabled the neutron porosity measurement to be obtained by employing an electronic neutron generator instead of a chemical source. These electronic neutron generators have been used for many years in different wireline tools and are now also available in LWD tools. The bulk density measurement has, until recently, only been measured utilizing a chemical source. Recent developments use the gamma rays induced by the interaction of high-energy neutrons (from the electronic neutron generator) with the formation as an "in-situ" source for subsequent derivation of bulk density. Studies of the sourceless neutron-gamma-density (SNGD) data acquired in 15 to 20 horizontal and vertical wells have shown the accuracy obtained is within the specified limits, as compared to the traditional gamma-gamma-density (GGD) data. The typical density differentials observed in these environments are in the 0.01 to 0.02 g/cm3 range, which results in a porosity and saturation "error" in the order of 0.002 to 0.004 V/V. This level of accuracy is probably acceptable in a number of applications (e.g., infill drilling in mature fields), but may not be acceptable in other scenarios (e.g., more complex lithologies, extremely tight reservoirs), unless the HS&E considerations are overriding. The HS&E benefits are important to keep in focus as they have a direct human benefit through the entire process of equipment preparation, transportation, wellsite operation and potential bottomhole assembly abandonment. Associated with this there is also the economic benefits related to less rig time required for source handling, and the potentially large savings in a lost-in-hole (LIH) abandonment scenario, in the locations where this is applicable. All these different aspects, HS&E, financial and technical, associated with the SNGD system need to be evaluated from a holistic viewpoint to ensure the most appropriate, fit-for-purpose acquisition program is selected in each case.

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Section: Data Validation Processmentioning

confidence: 99%

Sourceless Neutron-Density Porosity Determination: Fit-for-Purpose Formation Evaluation with Significant HS&E Benefits

Gjerdingen

Hilton

Bounoua

et al. 2012

SPE Annual Technical Conference and Exhibition

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“…For the ultra-long horizontal well, the efficient placement of conventional acids is critical. The difficulty of applying acid (HCl) in long horizontal wells to uniformly remove drilling damage has been identified by several authors (Brink et al 2010;Hoch et al 2010;Ritchie et al 2010). In the long horizontal well completion type, due to the limitation of Coiled Tubing (CT), acid diversion, or foam technology application, Controlled Acid Jetting (CAJ) and Acid Jetting methods are considered as the effective solution to stimulate the well.…”

Section: Acknowledgementsmentioning

confidence: 99%

“…Several papers have been published showing that well completions and intervention methods including future well stimulation techniques are an important component in field development concept (Brink et al 2010;Hoch et al 2010;Ritchie et al 2010).…”

Section: Acid Jetting Stimulation Treatmentmentioning

confidence: 99%

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

Sasongko

Zhu

Hill

2011

SPE European Formation Damage Conference

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In the Middle East, extended reach horizontal wells (on the order of 25,000 feet of horizontal displacement) are commonly acid stimulated by jetting acid out of drill pipe. The acid is jetted onto the face of the openhole wellbore as the drill pipe is withdrawn from the well. The jetting action helps to remove the drilling fluid filter cake and promote the acid to penetrate into the formation and form wormholes to stimulate the well. However, with very long sections of wellbore open to flow, the acid placement and subsequent wormhole distribution and penetration depths are uncertain. We have modeled this process using a comprehensive model of acid placement and wormhole propagation in a horizontal well. We presume that the acid jetting tool removes the drilling mud filter cake, so that no filter cake exists between the end of the drill pipe and the toe of the well. Correspondingly, we assume that there is an intact, low-permeability filter cake on the borehole wall between the end of the drill pipe and the heel of the well. The drill pipe is modeled as being withdrawn from the well during the acid jetting treatment, as is done in practice. The acidizing simulator predicts the distribution of acid and the depths of wormholes formed as functions of time and position during the acid jetting treatment. The model shows that the acid jetting process as typically applied in these wells preferentially stimulates the toe region of the horizontal well. Comparisons of the simulation predictions with published data for acid jetting treatments in such wells showed good general agreement. Based on the simulation study, we present recommendations for improved acid jetting treatment procedures to improve the distribution of acid injected into the formation.

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Engineered Reinforced Composite Mat Pills to Effectively Combat Losses While Drilling in Qatar

Muhammad

Karajagi

Pallapothu

et al. 2021

Day 1 Tue, June 08, 2021

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Drilling into fractures and fissures in carbonate reservoirs with lateral pore pressure variations is a major challenge. Accurately predicting and managing fracture initiation and fracture closure pressure is not practically feasible in naturally fractured carbonate rocks. Local fracture closure pressure (FCP, minimum in situ stress) around fractures are much lower than the mean value of FCP for the area, as observed in the Al Shaheen field. Drilling operators are experiencing massive lost circulation resulting in potential formation damage; and cost overruns. To address these lost circulation instances, modern lost circulation pills must be implemented. Drilling through the natural fractures within parts of the Shuaiba limestone reservoir usually results in significant drilling fluid losses, up to 50 m3/h. Lateral pore pressure variation causes dynamic inflow conditions within the wellbore, which make plugging fractures difficult. In addressing these lost circulation challenges, various approaches were previously used, notably reducing the hydrostatic pressure of fluids column, utilizing lighter weight drilling fluids, reducing the penetration of fluids into fractures with the use of various lost circulation materials, and the use of thixotropic cement slurries and lightweight high-solids-content cement slurries. Conventional lost circulation treatments provided very limited success under these conditions. An engineered composite fiber-based lost circulation pill with an innovative blend of fibers and sized solids to bridge and plug thief zones has been developed to address these lost circulation challenges. This pill was designed to be pumped through either a dummy bottomhole assembly (BHA) or through bypass circulation ports above the BHA with total flow area of 1.571 in2. These pills have been successfully used to mitigate losses while drilling as well as to achieve an incremental equivalent static density up to 144 kg/m3 to drill and cement the section. An impermeable grid created by this system was able to withstand the additional pressures. As a result, all the wells treated with these pills in the field were successfully drilled and cemented. After establishing the field specific guidelines over 2 years, continuous success was replicated in other wells for all the operator's rigs in Qatar.

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Pushing the Limits for Field Development

Cited by 5 publications

References 6 publications

Sourceless Neutron-Density Porosity Determination: Fit-for-Purpose Formation Evaluation with Significant HS&E Benefits

Sourceless Neutron-Density Porosity Determination: Fit-for-Purpose Formation Evaluation with Significant HS&E Benefits

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

Engineered Reinforced Composite Mat Pills to Effectively Combat Losses While Drilling in Qatar

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