First Successful Openhole Lateral Multistage Acid Frac in a Complex Unconventional Carbonate Reservoir North Kuwait

Al-Enezi, Badriya; Al-Mufarej, Mishal; Ashqar, Ayham; Navia, Alejandro

doi:10.2118/188170-ms

Cited by 8 publications

References 8 publications

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Acid Fracturing Was Selected to Stimulate the Potential Production in Low Permeability Reservoirs in Ahdeb Oilfield, Iraq

Xiao

Wang

Guo

et al. 2019

Day 3 Wed, March 20, 2019

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The low permeability reservoir of Ahdeb field discovered in the 80's, has more than 250 active wells with low initial production and rapid decline compared to other reservoirs. Matrix acidizing is the main stimulation method to recover and enhance production performance in Ahdeb oilfield, but short-distance deblocking acidizing can't communicate with the deep reservoir, and it is impossible to expand the effective seepage radius. Therefore, High reservoir heterogeneity, low permeability, poor pore pressure necessitates the move from conventional matrix stimulation to acid fracturing technology targeting better fracture conductivity and deep penetration for effective productivity and recovery enhancement. The acid fracturing feasibility research shows that the interlayer characteristics, lithologic barrier, stress barrier and oil-water relationship of the low permeability reservoirs are favorable for fracture initiation, expansion and geometry control. Acid fracturing is one of the best ways to stimulate the potential production in low-permeability reservoirs of the Ahdeb oilfield. The acid fracturing optimization includes fracture conductivity, fluid system and fracturing parameters. Pad acid fracturing and gel acid with multi-stage alternating and closed acid fracturing are the suitable technologies for low permeability reservoir stimulation. An experiment well has been simulated and designed, and the expected production increase is 1.5 times. Base on this paper's research, a wide-scale development strategy will be planned, and many wells will be stimulated for increase the production performance.

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Acid Fracturing Was Selected to Stimulate the Potential Production in Low Permeability Reservoirs in Ahdeb Oilfield, Iraq

Xiao

Wang

Guo

et al. 2019

Day 3 Wed, March 20, 2019

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High-Resolution Ultrasonic Borehole Imaging Enhances Reservoir Evaluation in Oil-Based Muds

Taher

Coates

et al. 2019

Day 2 Tue, October 01, 2019

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Obtaining high-resolution borehole images in oil-based mud (OBM) from logging-while-drilling (LWD) tools has been made possible through the recent development of ultrasonic imaging technologies. High-resolution acoustic impedance images enable reservoir evaluation through the identification of faults and fractures, bedding and laminations, and assessment of rock fabric. This paper presents examples of high-resolution images from a 4¾-in. ultrasonic imaging tool in OBM applications and discusses their value in assessing reservoir quality. This paper provides details of field trials of an LWD ultrasonic imaging tool for use in boreholes ranging from 5¾ to 6¾ in. High-resolution images detailing both borehole caliper and acoustic impedance in both vertical and horizontal wellbores are shown, illustrating the high level of formation evaluation now available when OBM is used. The methodology used to address the impact of tool motion on the impedance images will also be covered. The value of real-time data on borehole stability assessment will be discussed, along with additional applications made possible from the real-time data, such as wellbore placement enhancement. Both real-time and recorded data from field trials show the potential applications for the ultrasonic imaging tool. High-resolution impedance images covering different formations and lithologies show bedding planes and laminations and enable the calculation of stratigraphic dip, while the identification and assessment of fractures show the potential to aid operators during the development of their hydraulic fracturing program. Borehole caliper and shape assessment in real time can be used to modify the drilling parameters and to adjust mud weight, while providing an input into geomechanics assessment. The LWD logs presented illustrate the factors that influence data quality and the methodology used to ensure high-resolution images are available in both vertical and high-angle wellbores using OBM. A direct comparison between data acquired while drilling and while re-logging sections is shown, highlighting the repeatability of the measurement while also illustrating the impact of time-since-drilled on the borehole. A comparison with wireline measurements highlights the potential for using the high-resolution LWD images as an alternative to wireline, where cost and risk of deploying the wireline may be high. The ability to collect high-resolution images in OBM in wellbores ranging from 5¾ to 6¾ in. ensures that increased reservoir characterization is possible, leading to significant improvements in determining the viability of unconventional and other challenging reservoirs. The high-resolution amplitude images are comparable with those available on wireline technologies, and the real-time application of borehole size and shape for input into wellbore stability and geomechanics analysis ensures that common drilling hazards can be avoided.

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Enhancing Fracturing of Tight Carbonate Using Plug and Perf Technique- Case Study

Awad,

Sajer,

Qamber

et al. 2023

SPE/IATMI Asia Pacific Oil &Amp; Gas Conference and Exhibition

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The 1st oil in Kuwait was discovered in Bahrah in 1936. However, it was found uneconomical to develop this field due to complicated geological structure, formation tightness, cost and lack of technology at that time. In 2016, KOC has accomplished subsurface evaluation study to re-develop Bahrah field utilizing advanced fracturing technique. In last 5 years, the outcome of this study was applied successfully and resulted in remarkable production incremental from from ~3 MBOPD to more than 40 MBOPD. Multi-stage fracturing helped to unlock potential in most tightness carbonate formation in North Kuwait fields. Nevertheless, more studies was conducted to optimize the fracturing and completion design to improve well productivity as well as uniform production profile through well bore. Multi stage fracturing in open hole was the common technique since new development plan started. Although this technique had positive impact on overall field production, but it was observed uneven flow through wellbore. An approach using Plug and Perforation technique was implemented successfully to reduce dissipate of fracturing energy during pumping and improve acid propagation. Multi-stage fracturing completion in open hole horizontal wells has negative impact on acid propagation in comparison to the same for Plug and Perforation (PnP) Technique. The production logs was run in both cases and proved uniform production contribution in Plug and Perforation (PnP) technique. The paper will discuss results of applied cases with two different fracturing techniques. In addition, it will share practical operation experience including upsides and downsides of each technique to reduce risk of execution.

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First Successful Openhole Lateral Multistage Acid Frac in a Complex Unconventional Carbonate Reservoir North Kuwait

Cited by 8 publications

References 8 publications

Acid Fracturing Was Selected to Stimulate the Potential Production in Low Permeability Reservoirs in Ahdeb Oilfield, Iraq

Acid Fracturing Was Selected to Stimulate the Potential Production in Low Permeability Reservoirs in Ahdeb Oilfield, Iraq

High-Resolution Ultrasonic Borehole Imaging Enhances Reservoir Evaluation in Oil-Based Muds

Enhancing Fracturing of Tight Carbonate Using Plug and Perf Technique- Case Study

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