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Collaborating Authors
Abstract The deep carbonate reservoir formation on this field has proven to be an extreme High-temperature (HT) environment for downhole equipment. While drilling the 5000 - 6500 ft 5-7/8" slim long laterals across this formation, very high bottom-hole circulating temperatures is encountered (310-340 degF) which exceeds the operating limitation for the downhole drilling/formation evaluation tools. This resulted in multiple temperature-related failures, unplanned trips and long non-productive-time. It became necessary to provide solution to reduce the BHCT-related failures. Performed offset-wells-analysis to identify the BHT regime across the entire-field, create a heat-map and correlate/compare actual formation-temperatures with the formation-temperature-gradient provided by the operator (1.4-1.8 degF/100-ft). Drilling reports and MWD/LWD/wireline logs were reviewed/analyzed. Reviewed tools-spec-sheets, discovered most of the tools had a maximum-temperature-rating of 300-302 degF and were run outside-technical-limits. Observed temperature-related-failures were predominant in very long slim-laterals, which indicated that some of the heat was generated by high flow rate/RPM and solids in the system. Tried drilling with low-RPM/FR, did not achieve meaningful-temperature-reduction. After detailed risk-assessment and analysis on other contributing factors in the drilling process, opted to incorporate mud-chiller into the surface circulating-system to cool-down the mud going into the well. Upon implementation of the mud chiller system, observed up to 40 degF reduction in surface temperature (i.e. temperature-difference between the mud entering/leaving mud chiller). This was achieved because the unit was set-up to process at least twice the rate that was pumped downhole. Also observed reduction in the bottom-hole circulating temperature to below 300 degF, thus ensuring the drilling environment met the tool specifications. The temperature-related tools failure got eliminated. On some of the previous wells, wireline logging tools have been damaged due to high encountered downhole temperature as circulation was not possible prior-to or during logging operation. The implementation of the mud-chiller system has made it possible for innovative logging thru-bit logging application to be implemented. This allows circulation of cool mud across the entire open hole prior to deployment of tools to perform logging operation. This has made it possible for same logging tool to be used for multiple jobs without fear of tool electronic-components failure die to exposure to extreme temperatures. The long non-productive time due to temperature-related tool failures got eliminated. The numerous stuck pipes events due to hole deterioration resulting from multiple round trips also got eliminated. Overall drilling operations became more efficient. The paper will describe the drilling challenges, the systematic approach implemented to arrive at optimized solution. It will show how good understanding of drilling challenges and tailored-solutions delivers great gains. The authors will show how this system was used to provide a true step-change in performance in this challenging environment.
asia government, case study, circulation, DEGF, Directional Drilling, drilling fluid management & disposal, drilling fluids and materials, drilling operation, europe government, exchanger, geothermal gradient, high bottom-hole circulating temperature challenge, lateral, log analysis, Petroleum Engineer, presented, slim long horizontal well, uae government, united states government, Upstream Oil & Gas, well logging
Country:
- Europe (1.00)
- North America > United States > Texas (0.28)
- Asia > Middle East > UAE > Abu Dhabi > Abu Dhabi (0.15)
Oilfield Places: Asia > Middle East > Israel > Southern District > Southern Levant Basin > Efe Field (0.97)
SPE Disciplines:
Abstract The deep carbonate reservoir formation on this field has proven to be an extreme High-temperature (HT) environment for downhole equipment. While drilling the 5000 − 6500 ft 5-7/8" slim long laterals across this formation, very high bottom-hole circulating temperatures is encountered (310-340 degF) which exceeds the operating limitation for the downhole drilling/formation evaluation tools. This resulted in multiple temperature-related failures, unplanned trips and long non-productive-time. It became necessary to provide solution to reduce the BHCT-related failures. Performed offset-wells-analysis to identify the BHT regime across the field, create a heat-map and correlate/compare actual formation-temperatures with the formation-temperature-gradient provided by the operator (1.4-1.8 degF/100-ft). Drilling reports/MWD/LWD/wireline logs were reviewed/analyzed. Discovered the tools had a maximum-temperature-rating of 300-302 degF and were run outside-technical-limits. Temperature-related-failures were predominant in long slim-laterals, which indicated that some of the heat was generated by high flow rate/RPM and solids in the system. Tried drilling with low-RPM/FR, without meaningful-temperature-reduction. After detailed risk-assessment and analysis on other contributing factors in the drilling process, opted to incorporate mud-chiller into the surface circulating-system to cool-down the drilling mud. Upon implementation of the mud chiller system, observed up to 40 degF reduction in surface temperature (i.e. temperature-difference between the mud entering/leaving mud chiller). This was achieved because the unit was set-up to process at least twice the rate that was pumped downhole. Also observed reduction in the bottomhole circulating temperature to below 300 degF, thus ensuring the drilling environment met the tool specifications. The temperature-related tools failure got eliminated. On some of the previous wells, wireline logging tools have been damaged due to high encountered downhole temperature as circulation was not possible prior-to or during logging operation. The implementation of the mud-chiller system has made it possible for innovative logging through-the-bit logging application to be implemented. This allows circulation of cool mud across the entire open hole prior to deployment of tools to perform logging operation. This has made it possible for same logging tool to be used for multiple jobs without fear of tool electronic-components failure die to exposure to extreme temperatures. The long non-productive time due to temperature-related tool failures got eliminated. The numerous stuck pipes events due to hole deterioration resulting from multiple round trips also got eliminated. Overall drilling operations became more efficient. The paper will describe the drilling challenges, the systematic approach implemented to arrive at optimized solution. It will show how good understanding of drilling challenges and tailored-solutions delivers great gains. The authors will show how this system was used to provide a true step-change in performance in this challenging environment.
asia government, biggest gas field, case study, circulation, DEGF, Directional Drilling, drilling operation, europe government, exchanger, geothermal gradient, high bottom-hole temperature challenge, lateral, log analysis, Petroleum Engineer, presented, slim long horizontal well, uae government, united states government, Upstream Oil & Gas, well logging
Country:
- Europe (1.00)
- North America > United States > Texas (0.28)
- Asia > Middle East > UAE > Abu Dhabi > Abu Dhabi (0.15)
Oilfield Places: Asia > Middle East > Israel > Southern District > Southern Levant Basin > Efe Field (0.97)
SPE Disciplines:
Mud Cooler and Chiller Packages in High-Temperature Deep Horizontal Gas Wells: A Case Study from Saudi Arabia
Javay, Alexandre (Schlumberger) | Schmidt, Anderson (Schlumberger) | Franco, Nata (Schlumberger) | Aljuzayri, Mohammed (Schlumberger) | Sarbaoui, Nabil (Schlumberger) | Bansal, Sarvodaya (Schlumberger) | Redrup, John Philip (Schlumberger)
Abstract The temperature gradient in a giant gas field in the Middle East shows wide differences from one location to another. The drilling environment in slim single-lateral wells is challenging due to the substantial temperature anomalies resulting to multiple drilling tool failures where recorded downhole temperature exceeded 320 degF. This paper focuses on the first implementation of mud cooler with chiller packages in a gas drilling project and how it affected downhole temperature and well delivery performance. The process that led to the successful implementation of the technology can be summarized in four phases: the analysis of business drivers, preliminary temperature simulations and package design, and compatibility analysis, installation and operation. The identified business drivers included prevention of tool failures, optimization of drilling parameters, reduction of additional trips and the removal of the time-consuming staging procedure. To address these business needs importing HT tools did not seem to be the optimal solution as the temperature anomalies are not experienced in every well; the mud cooler and chiller offered the needed flexibility and cost-efficient solution. The mud cooler and chiller packages were implemented in a series of high-temperature gas wells and proved to be highly effective in rapidly decreasing the temperature of the mud at surface and substantially cooling down the downhole drilling tools. Maintaining a low downhole temperature throughout the section enabled the reservoir laterals to be drilled more efficiently, with less runs, and with no temperature-related tool failure. At surface, the mud temperature was lowered by more than 40 degF. Downhole temperature reduction measured by the drilling and measurement tools was up to 21 degF. Remarkable performance was achieved, such as the drilling of more than 3,000 ft of 5-7/8″ lateral in a single run while keeping the downhole temperature below 280 degF which was decisive in preserving the downhole tools. This project is a notable illustration of successful collaboration between different business units within the integrated service provider's organization to design and implement a fit-for-purpose solution to enhance tools’ reliability in high-temperature environments. The key elements which made the implementation successful in extending the runs and eliminating non-productive time for improved well delivery performance will be presented and described in length in the paper. Integration of the different technologies involved proved to be a key driver of innovation in the project and allowed for faster trials and deployment of new technologies and ways of working. Both the operator and the integrated services provider joined their efforts to achieve step changes in performance in high-temperature gas wells which can be successfully implemented elsewhere with all the main IOCs and NOCs.
Artificial Intelligence, chiller, DEGF, Directional Drilling, downhole temperature, drilling operation, drilling tool, Effectiveness, flow rate, heat exchanger, high-temperature well, Implementation, intermediate tank, mud cooler, mud cooler system, mud temperature, reduction, sensitivity, service provider, tool failure, Upstream Oil & Gas
Drilling Operations in HP/HT Environment
Ahmad, Izhar (Baker Hughes Inc) | Akimov, Oleg (Baker Hughes Inc) | Bond, Paul (Baker Hughes Inc) | Cairns, Paul (Baker Hughes Inc) | Gregg, Thomas (Baker Hughes Inc) | Heimes, Thomas (Baker Hughes Inc) | Russell, Greig (Baker Hughes Inc) | Wiese, Frank (Baker Hughes Inc)
Copyright 2014, Offshore Technology Conference This paper was prepared for presentation at the Offshore Technology Conference Asia held in Kuala Lumpur, Malaysia, 25-28 March 2014. This paper was selected for presentation by an OTC program committee following review of information contained in an abstract submitted by the author(s). Contents of the paper have not been reviewed by the Offshore Technology Conference and are subject to correction by the author(s). The material does not necessarily reflect any position of the Offshore Technology Conference, its officers, or members. Electronic reproduction, distribution, or storage of any part of this paper without the written consent of the Offshore Technology Conference is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of OTC copyright. Abstract The development of oil and gas assets is becoming more complex with reserves being found in more challenging environments. Wells are being drilled to greater depths and in areas where the temperature gradient is higher, requiring downhole equipment to withstand temperatures in excess of 302 F (150 C) and pressures in excess of 30,000 psi. Directional wells require measurement while drilling (MWD) and a suitable drive system, such as a positive displacement mud motor or rotary steerable system (RSS), which can operate reliably in these challenging environments. High-pressure environmental challenges are successfully addressed using seals to isolate the inner equipment from the wellbore fluid, protecting it from variations in material properties and geometrical dimensions.
application, BHA, Circulate, complex reservoir, directional drilling systems and equipment, downhole tool, drilling data acquisition, Drilling Equipment, drilling fluid management & disposal, drilling fluids and materials, drilling measurement, drilling operation, electronics, failure mode, high pressure high temperature, HPHT, HPHT well, knowledge management, mud cooler, mwd lwd service, Operation Procedure, procedure, static temperature, Technology Conference, Upstream Oil & Gas, utilization, vibration
Country:
- North America > United States (0.46)
- Asia > Middle East > UAE (0.28)
- Asia > Malaysia > Kuala Lumpur > Kuala Lumpur (0.24)
Oilfield Places:
- North America > Cuba > Gulf of Mexico (0.89)
- Africa > South Africa (0.89)
SPE Disciplines:
Drilling in hot-hole applications results in additional time and care spent to ensure the integrity of temperature sensitive downhole tools. Rotary steerable systems, monitoring while drilling equipment, mud motors, drilling jars, and electronic sensor packages measuring vibration, loads, temperature, and pressure all have temperature limitations that, when met, require drilling ahead to halt so that the fluid system can be cooled down sufficiently enough to prevent damage to these tools. Conventional approaches such as circulating to cool and evaporative cooling systems are slow and costly. This paper will detail a solution that is capable of extending the running life of these temperature sensitive tools while reducing the overall cost of the well. An innovative technology is now available to facilitate the rapid cooling of drilling fluids. The design departs from the nonproductive time spent simply circulating to cool and surpasses the economic capabilities of evaporative cooling systems. This closedloop system has been proven on multiple wells with a variety of configurations and operational parameters to confirm the nature of the system's performance abilities. Downhole tool life was monitored and reliability data gathered to show the improved functional life of these components relative to the performance of the fluid conditioning system. Performance testing proved directly that run life of electronics can be increased by a factor as high as 43%. This extended run life resulted in reduced trips for changing out tools and in turn improved the overall drilling rate. The reduction in drilling fluid temperatures of up to 45 °F (at surface) and 21 °F at bottomhole in a single pass allowed a reduction in nonproductive time spent circulating to cool of more than a full day. This paper focuses on the mud chiller performance data and for the overall operations on multiple wells drilled as part of a case study in hot-hole applications. Data presented in this paper will show that the system has the ability to shorten time to depth and reduce the overall cost of drilling operations.
ambient temperature, directional drilling systems and equipment, Drilling Equipment, drilling fluid management & disposal, drilling fluids and materials, drilling operation, DSMC, Efficiency, electronics, flow rate, fluid conditioning technology reduce day, heat exchanger, Offshore Technology Conference, reduction, suction tank, temperature drop, temperature gradient, Upstream Oil & Gas, wellbore
Country:
- South America > Brazil (0.29)
- North America > United States > Texas (0.28)
Oilfield Places:
SPE Disciplines:
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