Successful Coiled Tubing Open-Hole Notching Technique: A Novel Approach to Enhance Multiple Fracture Initiation
- Frank Fakuen Chang (Saudi Aramco) | Danish Ahmed (Schlumberger) | Mohammad Arifin (Schlumberger) | Devesh Pathak (Schlumberger) | Adzlan Ayob (Schlumberger)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 13-15 January, Dhahran, Kingdom of Saudi Arabia
- Publication Date
- Document Type
- Conference Paper
- 2020. International Petroleum Technology Conference
- Fracture Initiation, Real-time, Coiled tubing, Circular Notching, Injectivity
- 2 in the last 30 days
- 2 since 2007
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Coiled tubing (CT) notching can help create controllable fracture initiation sites along a long horizontal openhole wellbore. It can also be used as a standalone stimulation technique in carbonate reservoirs. This paper describes a CT notching with acid to enhance fracturing initiation. Prior to fracturing, the well injectivity was significantly increased by the notching process.
A CT-conveyed and hydraulically driven rotatable jetting bottom hole assembly was used to cut notches in a horizontal openhole lateral in a carbonate reservoir. Hydrochloric acid was used as a jetting fluid to dissolve and penetrate the rock away from the wellbore to result in deep notches into the reservoir. CT with fiber-optic real-time telemetry system was utilized for conducting the depth correlation using gamma ray (GR) measurements and ensuring notches are created at the desired depths. These deep notches reduced fracture initiation pressure and controlled fracture locations. Fiber-optic temperature sensing was used to determine the injection profile before and after the acid notching with CT.
Real-time bottom-hole temperature measurements were utilized as an indication of notches creation, whereas the real-time pressure measurements helped optimize the abrasive hydraulic jetting tool functionality and to compare the pre and post notching injectivity.
The notch fracturing was implemented in a multi-lateral water injection well completed in a tight carbonate reservoir. To create effective and deep notches, 15% HCl was jetted into the formation, with rotating jetting nozzles, the penetrating acid tunnels intersected the wellbore with deep notches. Four notches were created at 4 different well depths, which were selective based on the Gamma Ray log. Each notch required the CT to station at the depth for 30-mins to create the notch. After the successful notch creation, the well injectivity was seen to increase significantly and a caliper log clearly identified the locations where the notches were generated.
This paper describes a part of the notch fracturing treatment process. It focused on the CT notching aspect of the full technology. Another paper is written to describe the openhole multiple fracturing without mechanical isolation utilizing the CT notching. The CT notching was demonstrated to enhance well injectivity, reduce the fracture breakdown pressure, and lower the multi-stages fracturing operational cost.
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Chang, F.F., Bartko, K.. 2014. Multiple Fracture Initiation in Openhole Without Mechanical Isolation: First Step to Fulfill an Ambition. Presented at the SPE Hydraulic Fracturing Technology Conference, The Woodlands, Texas, USA., 4-6 February. SPE-168638-MS. https://doi.org/10.2118/168638-MS.
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