Development of a trip time for bit exchange simulator for drilling time estimation. (January 2018)

• Record Type: Journal Article
• Authors: Lee, Seung Soo; Kim, Kwang Yeom; Seo, Jong Won
• Is Part Of: Geothermics. Volume 71(2018)
• Page Start: 24
• Page End: 33
• Publication Date: 2018-01
• Subjects: Engineered geothermal system -- Drilling -- Rate of penetration -- Trip time for bit exchange -- Bourgoyne and Young model; Hydrogeology -- Periodicals; Geothermal resources -- Periodicals; Énergie géothermique -- Périodiques; GEOTHERMAL ENGINEERING; GEOTHERMAL ENERGY; GEOTHERMAL EXPLORATION; Geothermal resources; Hydrogeology; Periodicals; Electronic journals; 621.44
• DOI: 10.1016/j.geothermics.2017.07.006
• Languages: English
• ISSNs: 0375-6505

Abstract

Highlights: A methodology for predicting the time required for a trip for bit exchange was devised. A simulation algorithm for the optimal selection of trip occurrence point to increase the productivity of drilling operation was developed. The wear conditions of drilling bits are determined by tooth geometry, bit weight, rotation speed, and rock conditions based on Bourgoyne and Young model. Abstract: The development of geothermal power generation technologies for applications in non-volcanic areas, based on artificial reservoir creation, has prompted numerous studies on the efficient and economic execution of costly deep subsurface drilling operations. However, the difficulties in predicting the duration and cost of boring work with acceptable reliability make the efficient and organized management of drilling operations very difficult. The trip time for drill bit (i.e., the time taken to withdraw the drill stem to replace bits worn-out, followed by its re-entry into the borehole) that is required because of the abrasion and replacement of bits has a large impact on drilling time and performance. Therefore, a methodology for predicting the time required for a trip for bit exchange at a given depth will enable reliable drilling time and cost estimation for better drilling production management. This study divided the abrasion condition of roller bits into eight steps and used bit life expectancy time for developing a simulation algorithm for Trip Time for Bit Exchange (TTBE). A methodology that can classify the depth of drilling well based on the characteristics of the formation and drilling parameters has also been suggested based on the Bourgoyne and Young model to forecast drilling rates and the extent of bit abrasion.