A Sustainable Approach to Production Increase in the Zawtika Field: Sand Control Assisted with Hydrofluoric Acidizing
- Colin William (PTTEP) | Graham Grant (PTTEP) | Attawit Choodesh (PTTEPI) | Cristian Ramirez (Halliburton) | Ahmad Nusyirwan (Halliburton) | Doffie Cahyanto Santoso (Halliburton)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 27-29 August, Bangkok, Thailand
- Publication Date
- Document Type
- Conference Paper
- 2018. IADC/SPE Asia Pacific Drilling Technology Conference
- 7.2.1 Risk, Uncertainty and Risk Assessment, 4.1.2 Separation and Treating, 6.5.4 Naturally Occurring Radioactive Materials, 2 Well completion, 3.2.3 Produced Sand / Solids Management and Control, 3.2 Well Operations and Optimization, 1.8 Formation Damage, 4 Facilities Design, Construction and Operation, 5.1.1 Exploration, Development, Structural Geology, 5.1 Reservoir Characterisation, 1.8.3 Fines Migration, 4.1 Processing Systems and Design, 2.2 Installation and Completion Operations, 7.2 Risk Management and Decision-Making, 2.4 Sand Control, 2.6 Acidizing, 5 Reservoir Desciption & Dynamics, 3 Production and Well Operations, 7 Management and Information
- SUSTAIN, HF, PRODUCTION, ACID, SANDCONTROL
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Sand and fines production in oil and gas wells are a major challenge that can result in production system failures. In unconsolidated sand reservoirs, proper sand-control practices are necessary to help prevent reservoir sand production. To remove formation damage and control fines migration, acid treatments are pumped ahead of sand-control treatments, which can be challenging because variations in mineralogy determine fluid performance and require a customized fluid selection. For this case, improvements in cased hole sand-control completions were initially sought by switching to high-rate water pack (HRWP) or fracture for placement of gravel (FPG) techniques; however, obtaining fracture conductivity and minimizing out-of-zone fracture growth was challenging. To accomplish the latter, fluid selection was optimized with linear-gel systems and relative permeability modifiers as prepad systems. Operators should know the formation's composition at the treatment point for a successful acidizing treatment to be performed. The dominant mineral component and temperature of the target formation determines the most effective preflush, hydrofluoric (HF)/hydrochloric (HCl) acid treatment blend, and preflush/treatment volume.
The successful implementation of HRWP and FPG techniques produced excellent results with regards to skin minimization and production maximization. The HRWP technique was applied when gas/water contact was nearby, allowing flow from a moderate to high payzone kh (permeability × net pay), and FPG was used to produce a proper flow in low kh formations.
The goal of sandstone-matrix acidizing is to remove siliceous microparticles blocking or bridging pore throats by injecting acid formulations containing HF acid. The presence of potassium feldspars, sodium feldspars, illite, and zeolites is a concern because these compounds can form or contribute to forming significant matrix-blocking precipitates, such as sodium or potassium fluosilicates and aluminum fluorides, during HF/HCl treatments. Variations in mineralogy determine fluid performance and make customized fluid selection necessary. The goal is to minimize the risk of over acidizing the near-wellbore region and to extend the reaction for deeper penetration when possible. In some cases, the acid systems with the equivalent strength of up to 1.5% HF acid were used.
This paper describes the planning process, acid treatment selection based on laboratory testing, placement and diversion techniques, sand-control completions selection, operation summary, and evaluation of treatment success.
|File Size||1 MB||Number of Pages||12|
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