Multistage Refracture in a Horizontal Well Using Flow-Diverting Technology

Astafyev, Vladimir; Lahman, Matthew; Chaburdo, Pavel; Mast, Michael; Mazitov, Marat; Makienko, Vladimir; Valiullin, A. S.

doi:10.2118/182112-ms

All Days 2016

DOI: 10.2118/182112-ms

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Multistage Refracture in a Horizontal Well Using Flow-Diverting Technology

Vladimir Astafyev

Matthew Lahman

Pavel Chaburdo

et al.

Abstract: Summary Development of hard-to-recover reserves in Russia necessitates the development of new technologies and use of those technologies for efficient production of hydrocarbons. One such technology is multistage fracturing in horizontal wells. Beginning in 2010, such technologies have been widely used in many regions. A liner with swellable or hydraulic packers for separation of intervals and fracture ports opened with balls or actuated with the help of coiled tubing is the simplest and most ec… Show more

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Selecting a Horizontal Well Candidate in the Black Sea for Refracturing with Flow Diverting Technology

Janiczek

Makar

Reilly

et al. 2018

SPE Europec Featured at 80th EAGE Conference and Exhibition

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This paper identifies restimulation opportunities in existing multistage completed horizontal wells with plans for a customized refracturing solution applying breakthrough stimulation and diversion processes to increase oil production in a tight carbonate formation, offshore Black Sea. Because operators are shifting strategy in a low oil price environment from new well drilling toward well interventions, refracturing is gaining more focus, particularly for tight and less conventional reservoirs. Many potential candidates also have suboptimal completions for refracturing, so the challenge for operators is selecting the best candidates and designing a refracturing treatment for improved well performance in these complex situations. This paper describes the well screening and selection process for the restimulation of existing horizontal wells with multistage openhole completions. During Phase 1 of the project, pilot candidates were ranked using a weighted average score of specific decision criteria for evaluating the refracturing potential. The goal of the screening process was to identify wellbores with the most bypassed reserves and to determine the root cause. Top candidates demonstrated bypassed reserve potential because of large completion spacing and lower average permeability than was originally estimated. The design process emphasized identifying areas where incremental oil could be accessed by substantially increasing total exposed conductive surface area and placing new fractures between existing using novel approaches to refracturing incorporating flow diverting technology. The application of an engineered pressure-managed design approach optimized proppant cycles, and flow diverting refracturing methods were a fundamental component in recognizing that the restimulation pilot was realistic, achievable, and justified economically. By dynamically managing and adapting proppant schedules, diverter volume fractions, and total materials pumped over time, new induced fracture surface areas can be reliably created in the most economic manner. Phase 2 consisted of executing the refracturing operation on the selected pilot well, which had been originally hydraulically fractured in 2009. A repressurization procedure of the reservoir was performed before the main treatment to equalize pressure depletion along the lateral and ultimately enhance the coverage of newly fractured zones along the wellbore. The refracturing treatment on the pilot well consisted of four proppant cycles with application of engineered pressure management to improve fracture initiations and flow distribution. A degradable particulate diverter technology was used as primary isolation of each fracturing cycle. Restimulation results of the pilot well demonstrated technical and production success, with huge potential to implement this technology during the next phase of field revitalization (Phase 3). This pilot project has proved that the combination of a well selection process aimed at finding unstimulated and bypassed reservoir volume and the application of customized technical solutions for refracturing can be successfully applied to increase recovery factors and identify new opportunities in mature field redevelopment.

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Selecting a Horizontal Well Candidate in the Black Sea for Refracturing with Flow Diverting Technology

Janiczek

Makar

Reilly

et al. 2018

SPE Europec Featured at 80th EAGE Conference and Exhibition

View full text Add to dashboard Cite

show abstract

Case History of a Successful Hydraulic Restimulation Pilot: The Story from Pilot Candidate Selection to Post-job Evaluation and Rollout

Janiczek

Dragomir

Stojkovski

et al. 2019

Day 2 Tue, November 12, 2019

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This work presents the entire case history process from the recognition and identification of a potential candidate for multistage hydraulic re-stimulation. This includes operational preparations, execution, and how post-treatment results influenced the rollout of a pilot. While the recognition of the potential candidate was a coincidence by intersecting a stimulated area from one well to a neighboring well, resulting in sustainable higher production, the study phase to identify the full field potential and candidate well identification was executed in a structured way. A primary challenge was the proper preparation of the well, while keeping the overall costs manageable. Dedicated supply vessel has been used to accommodate stimulation equipment which was used to execute hydraulic stimulation treatments in Black Sea. Hybrid designs have been designed to carry 20/40 RCP proppant, which was pumped in four cycles. Since reservoir has been accessed by originally opened sleeves with addition of new hydrajet cuts along horizontal section the need of special degradable diverter was required to ensure good lateral coverage and proppant distribution. Together with the treatment, hydrocarbon and water sensitive tracers were pumped, allowing an allocation of flow per cycle. After shutting in the well to allow the resin coated proppant to cure, the well was cleaned out with energized fluid and returned to production Within four hydraulic re-stimulation cycles, a total of 300 tons of proppant with approximately 2,000 m3 of fluid were pumped and successfully diverted. End of cycle ISIPs rose by more than 20 bars and back-calculation of volume of the diverter stages allowed identifying the diversion effect. During the initial flow phase, very high water cut was observed, exhibiting good cleanup of the treatment. After 2 weeks, the rate stabilized at double the pre-treatment rate and slightly above the conservative prediction. Multistage hydraulic re-stimulation is not well utilized in Europe thus far and has not been applied offshore. In this mature field, the entire process from study to execution and post-job analysis was strongly cost driven, but resulted in the potential for six more hydraulically stimulated wells in this field.

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A Decade of Multi-Zone Fracturing Treatments in Russia

Astafyev

Samoilov

Fayzullin

et al. 2020

Day 2 Wed, September 23, 2020

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Multistage hydraulic fracturing (MSHF) has given new impulse to the development of hydraulic fracturing market in Russia. This paper illustrates the evolution of horizontal well multi-zone stimulation methods for the past decade in Russia. Examples of multi-zone treatments using various technologies in different fields are given. Analysis of the work performed shows how the integration of modern drilling, completion, stimulation, control and production methods allowed cost-effective development of hard-to-recover reserves. The development of multi-zone well stimulation brought to the market new horizontal well completion, fracture mapping, production and field development control technologies. The article also evaluates potential development and application of multi-zone technologies.

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Multistage Refracture in a Horizontal Well Using Flow-Diverting Technology

Cited by 3 publications

References 3 publications

Selecting a Horizontal Well Candidate in the Black Sea for Refracturing with Flow Diverting Technology

Selecting a Horizontal Well Candidate in the Black Sea for Refracturing with Flow Diverting Technology

Case History of a Successful Hydraulic Restimulation Pilot: The Story from Pilot Candidate Selection to Post-job Evaluation and Rollout

A Decade of Multi-Zone Fracturing Treatments in Russia

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