Application of MFO Injections Procedure for MSF Packers Integrity Diagnostic

Nugraha, Ikhsan; Said, Rifat

doi:10.2118/172218-ms

All Days 2014

DOI: 10.2118/172218-ms

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Application of MFO Injections Procedure for MSF Packers Integrity Diagnostic

Ikhsan Nugraha

Rifat Said

Abstract: In recent years, multistage fracturing completion has been adopted by many operators across the globe as a primary means to maximize reservoir contact. To succeed, this completion strategy must be complemented with good understanding on petrophysical and geomechanical properties of the reservoir; which resulted in a better understanding of fracture orientation and decisions on open hole length, number of fracturing stages, packers and frac ports placement.When dealing with a low permeability environment, for a… Show more

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Cited by 3 publications

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Stimulating Low Permeability Carbonate Reservoirs by Applying Acid Fracturing with Open-Hole Multi-Stage Completions Combining Sliding Sleeves and Swellable Packers for Effective Fracture Placement

Guizada

Nugraha

Alrashed

et al. 2016

Day 3 Fri, August 26, 2016

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Low permeability oil and gas-bearing carbonate formations are routinely completed with open hole horizontal laterals and multistage fracturing treatments to achieve maximum reservoir contact and enhance production of the formations. This completion technique has been successfully used in previously non-economical reservoirs — in North America and around the globe — to make them commercial. Open hole multistage fracturing technologies have been deployed in tight gas carbonate reservoirs to improve well productivity while using reservoir simulations to optimize the fracture design. When applying multi-stage fracturing one of the key aspects is to assure the isolation between the stages to induce independent fractures. This goal becomes even more challenging to achieve when the process is an acid fracturing treatment. Hydraulic communication between the fracture stages has been previously observed, which has prevented the creation of separate fractures transverse to the wellbore, thereby resulting in fewer and shorter fractures, mostly created along the wellbore plane. In many cases, new fractures could not even initiate and only matrix acid treatments could be conducted. To overcome the isolation challenge during an acid treatment, a multistage completion assembly based on sliding sleeves and swellable packers has been devised and implemented to conduct selective acid fracturing in low permeability carbonate reservoirs. This combined system has mechanically simplified the multistage fracturing job, reducing costs and complexity compared with traditional cement and perforating methods. The system provides excellent isolation between consecutive treatments by providing positive annular barriers. The technology ensures that the entire lateral is treated uniformly and according to the design, enhances proper fracture placement, increases reservoir contact area, and improves well productivity. This paper describes and addresses the successful deployment of this completion and fracturing technology. The success resulted from careful planning, fluid testing, and a comprehensive completion design that was fit-for-purpose to provide optimal stimulation treatment and productivity enhancement.

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Stimulating Low Permeability Carbonate Reservoirs by Applying Acid Fracturing with Open-Hole Multi-Stage Completions Combining Sliding Sleeves and Swellable Packers for Effective Fracture Placement

Guizada

Nugraha

Alrashed

et al. 2016

Day 3 Fri, August 26, 2016

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Acid Fracturing of Low Permeability Carbonate Formation Lessons Learned

et al. 2018

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This paper provides information on the journey and lessons learned from one well’s acid MSF from the required lab design, through on-site fluids’ QA/QC findings, to the 4 days of flow back sample analyses indication. Several pre-job lab assessments were conducted to: Optimize the diversion fluids rheology, assure sufficient acid corrosion inhibition, and eliminate the incompatibility issue between all pumped fluids and the reservoir acid sensitive crude oil. Additionally, on-site QA/QC critical findings for each stage fluid resulted in taken corrective actions for assured acceptable concentration and stability of mixed acid recipes and the adequacy of fracturing fluid viscosity. The 4 days of flow back samples analyses revealed the need for a longer cleanup time. In addition, ion composition of flowback samples were used to identify areas of improvement and enhancement in fracturing fluid design. The successful massive multistage acid fracturing was achieved with over a two-fold increase in production rate. A major part of the success is attributed to a scheme of the fluid’s optimization, quality control, on-site QA/QC and cleanup monitoring progress. In addition, on-site fracture treatment evaluation for each stage individually has a major impact on operational success utilizing pressure sensors response and fracturing simulation software. Finally, a comprehensive analysis for an acid fracture job and the lessons learned from this operation will be shared. The journey of lessons learned started from the lab to the field, and back to the lab, with strong guidelines for all future acid fracturing jobs in similar oil fields

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Self-Degradable Particles Mitigate Communication Between Stages in Multistage Acid Fracturing Completion

Alabdulmuhsin

Al-Kulaib

Hansen

et al. 2020

Day 4 Thu, November 12, 2020

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Openhole multistage fracturing (OH MSF) completions consisting of openhole packers and ball-activated sleeves have become common to maximize reservoir contact in carbonate formations in Saudi Arabia. However, multiple cases have experienced communication between stages while performing acid fracturing treatments, caused by leaks at the openhole isolation packers. Consequently, sizeable portions of the target reservoir remain unstimulated. The loss of isolation between stages can be detected during ball landing, followed by an injection test in the subsequent zone. When treating pressure remains essentially the same as before, and after landing the stage ball, the treating fluid is likely bypassing the openhole packer into the previously stimulated interval. To solve this problem, a small volume of fluid carrying degradable multimodal particles and fibers have been pumped at a low rate ahead of the acid fracturing treatment to stop fluid flowing behind the packers. Subsequent treating fluids are injected into the intended interval, thus evenly stimulating the entire lateral. It was observed that when the pill arrived at the leak, pressure built rapidly, indicating effective bridging of the concentrated particulate pill. The total pressure increase was evaluated to confirm the performance of the pill material and that stage isolation had been restored. Afterward, pressure behavior during the acid fracturing treatments indicated that a new fracture was created in the target openhole interval. In several cases, the pill sustained more than 5,600-psi pressure buildup to successfully plug the leaks. Also, all materials used to form the pill are fully degradable, and no damage is left in the formation. Therefore, the entire wellbore is effectively stimulated with improved reservoir contact, resulting in higher production rates and enhanced reservoir drainage. Degradable particulate diverters have been widely used in recent years as an effective way to increase stimulated rock volume by diverting at the fracturing face in the near-wellbore region. The cases described in this paper show the first application of this technology as temporary isolation to mitigate interstage communication inside the wellbore.

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Application of MFO Injections Procedure for MSF Packers Integrity Diagnostic

Cited by 3 publications

References 5 publications

Stimulating Low Permeability Carbonate Reservoirs by Applying Acid Fracturing with Open-Hole Multi-Stage Completions Combining Sliding Sleeves and Swellable Packers for Effective Fracture Placement

Stimulating Low Permeability Carbonate Reservoirs by Applying Acid Fracturing with Open-Hole Multi-Stage Completions Combining Sliding Sleeves and Swellable Packers for Effective Fracture Placement

Acid Fracturing of Low Permeability Carbonate Formation Lessons Learned

Self-Degradable Particles Mitigate Communication Between Stages in Multistage Acid Fracturing Completion

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