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Coiled tubing operations
This topic presents the basic elements of a coiled tubing well intervention and outlines the steps involved in pre-job planning, job execution, and post-job activities from a field engineering/operations standpoint. The general surface and subsurface equipment used in coiled tubing operations are discussed, as well as downhole tools provided by the major service companies and used by coiled tubing operators. In addition, this topic describes general operating procedures for carrying out coiled tubing operations, with an emphasis on HSE considerations.
Underbalanced Coiled Tubing Drilling: Delivering Well Production Safely in High H2S and Tight Gas Reservoirs, UAE
Khan, Rao Shafin Ali (SLB (Corresponding author)) | Molero, Nestor (SLB) | Alam, Shah Sameer (SLB) | Mishael, Mohammad Basim (SLB) | Basha, Maged (SLB) | Zia, Arslan (SLB) | Zhylkaidarova, Sholpan (SLB) | Abd El-Meguid, Mohamed Osama (ADNOC Onshore) | Al Ali, Abdulrahman Hasan (ADNOC Onshore) | Saleh, Abdalla (ADNOC Onshore) | Almazrouei, Saeed Mohamed (ADNOC Onshore) | El Shahat, Ayman (ADNOC Onshore) | Bin Sumaida, Ali Sulaiman (ADNOC Onshore) | Al Mutawa, Ahmed Abdulla (ADNOC Onshore) | Yousfi, Fawad Zain (ADNOC Onshore) | Almteiri, Nama Ali (ADNOC Onshore) | Baslaib, Mohamed Ahmed (ADNOC Onshore) | Mantilla, Alfonso (ADNOC Upstream) | Ladmia, Abdelhak (ADNOC Upstream)
Summary United Arab Emirates (UAE) is seeking to become self-sufficient in gas supply by 2030. This has led the country to initiate several exploratory and appraisal projects to achieve this goal. This study covers one such pilot project targeting production from tight gas reservoirs in three wells through a coiled-tubing (CT) underbalanced drilling (UBD) project in ADNOC Onshore. CT pressure control equipment (PCE) was rigged up on top of production trees with wells already completed and cemented. A CT tower was used to accommodate the drilling bottomhole assembly (BHA) and eliminate risks related to its deployment. CT strings were designed to reach target intervals with sufficient weight on bit (WOB), suitable for sour environments, and able to withstand high pumping rates with mild circulating pressures. To address the hazards of H2S handling at the surface, a custom-fit closed-loop system was deployed. The recovered water was treated on the surface and reused for drilling to decrease the water consumption throughout the operations. The plan was to drill 3 3/4-in. horizontal laterals in all candidate wells. Each well was completed with a combination of a 4 1/2-in. and a 5 1/2-in. tubing and a 7-in. liner. Five laterals were drilled across the three candidate wells targeting carbonate reservoirs with each lateral having an average length of ~4,000 ft. The achieved rates of penetration varied significantly from 15 ft/min to 30 ft/min while drilling through the various formations. Over the course of the pilot project, several challenges had to be addressed, such as material accretion on the CT string during wiper trips, treatment of return fluids having high H2S content and rock cuttings, and ensuring the integrity of the CT pipe while operating in severe downhole environments. Solutions and lessons learned from each well were implemented subsequently in the campaign, such as the use of increased concentrations of H2S inhibitor to coat the CT string, the use of nitrified fluids based on changing well parameters to maintain underbalance, thorough pipe management through real-time CT inspection, and adding a fixed quantity of fresh water to the drilling system every day to avoid chemical reactions between the drilling fluid additives and hydrocarbons. The wells completed with this method exceeded production expectations by 35–50% across the project while reconfirming the value of the technology. The use of CT for UBD is still considered a challenging intervention worldwide. Such cases in high H2S environments are rare. This study outlines best practices for a CT UBD and a setup that can be replicated in other locations to implement this methodology with high H2S and when rig sourcing is a concern.
Engineered Ultra-Low Invasion Loss Control Solution Allows Circulation, Ensuring Cement Placement and Zonal Isolation in Liner Cementing Jobs and Through Coiled Tubing – Case Studies
Fazal, Muhammad Adnan (Sprint Oil and Gas Services FZC) | Ahmad, Syed Hamza (Sprint Oil and Gas Services FZC) | Yousuf, Arif (Sprint Oil and Gas Services FZC) | Rehman, Aziz ur (Sprint Oil and Gas Services FZC) | Noor, Sameer Mustafa (Oil & Gas Development Company Limited) | Nazir, Irfan (Oil & Gas Development Company Limited)
Abstract The conventional loss cure techniques are largely reactive and include addition of coarse grade particle, fibrous material and other viscous pills that are lost into formation during loss cure attempts. Being highly invasive, these loss cure solutions block pore throats and line producing fractures causing considerable formation damage and loss of net asset value. Moreover, these techniques pose additional challenges while placing thru slim liners and coiled tubing (in rigless applications) due to elevated risk of getting the circulation ports plugged. Moreover, during the era of technological revolution and decarbonization, an effective and efficient solution aids to promote the practices producing low carbon emission. The proactive wellbore shielding loss cure is a particle size distribution-based LCM solution having excellent fluid loss properties and exhibiting low permeability barrier at the fluid-rock interface. The low permeable shielding effect offers less invasion across a broad range of pores (1microns to 4,000microns) and thereby protecting formation from any permanent impairment. The solution covers the wide range applications of loss cure throughout well life ensuring zonal isolation and saving significant rig time. Customized particle size distribution does allow LCM solution to be pumpable thru liner complying the allowable particle sizes (less than 1,000microns) and concentrations (upto 18 lbs/bbl) and for coiled tubing specialized applications with allowable particles size of 100 microns while maintaining rheological properties (Fluid Loss<50 ml/30 min, 5lbs/100ft2>Ty<10lbs/100ft2 & PV<90 cp). This paper demonstrates the working principle and practical applications of engineered solution for loss cure and successfully achieving zonal isolation in 7" liner being placed as pre-cement spacer in naturally fractured formation. The wellbore shielding pre-cement spacer ensured the cement rise above loss point thus achieving zonal isolation in partial to complete losses environment and helps in minimizing formation's impairment. The same approach was adopted to cure losses in rigless with coiled tubing in both carbonate and sandstone reservoirs for well killing and zonal isolation without plugging the CT BHA and circulation ports while complying design requirements.
- South America (0.68)
- Asia > Middle East (0.28)
- Well Drilling > Wellbore Design > Wellbore integrity (1.00)
- Well Drilling > Pressure Management > Well control (1.00)
- Well Drilling > Drilling Operations (1.00)
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Coiled Tubing string manufacturing and history Coiled Tubing Design-Execution-Evaluation cycle CT operating categories by pressure rating as per API – well control stack configuration Job design basics and calculations Coiled Tubing Equipment TFM design and simulation scenarios CT Applications - Sand Clean out design. Objectives: Attendees will gain a basic knowledge of the Coiled Tubing equipment, and string, its capabilities and basics of job design and operation planning. Day 2: This day will aim toward deepening your knowledge on the technical design and specific applications.
Coiled Tubing string manufacturing and history Coiled Tubing Design-Execution-Evaluation cycle CT operating categories by pressure rating as per API – well control stack configuration Job design basics and calculations Coiled Tubing Equipment TFM design and simulation scenarios CT Applications - Sand Clean out design. Objectives: Attendees will gain a basic knowledge of the Coiled Tubing equipment, and string, its capabilities and basics of job design and operation planning.