Analiza testa porasta tlaka hidraulički frakturirane bušotine primjenom programa Saphir

master's thesis

• Title: Analiza testa porasta tlaka hidraulički frakturirane bušotine primjenom programa Saphir : diplomski rad
• Title (english): Pressure build-up test analysis of hydraulically fractured well using the Saphir software : master's thesis
• Author: Andrea Valjak
• Mentor: Sonja Koščak Kolin (mentor)
• Committee member: Sonja Koščak Kolin (predsjednik povjerenstva)
• Committee member: Vladislav Brkić (član povjerenstva)
• Committee member: Borivoje Pašić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Petroleum and Gas Engineering and energy); Zagreb
• Defense date and country: 2021-09-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Petroleum Mining

Abstract

U radu je obrađena analiza testa porasta tlaka hidraulički frakturirane bušotine na odabranom naftnom ležištu. U tu svrhu najprije je teoretski opisana analiza testa porasta vertikalne bušotine iz koje su razvijeni analogni modeli za analizu tlaka frakturiranih bušotina. Glavna svrha ovakvih testova jest određivanje ležišnih svojstava, kao što su propusnost stijene i skin faktor, odnosno poluduljina pukotine i njezina vodljivost. Za analizu se upotrebljavao program Saphir, te se na temelju deset različitih slučajeva istog testa porasta tlaka odabrana analiza u kojoj se model frakturirane bušotine i ležišnog fluida najbolje podudara s krivuljom mjerenog tlaka i s krivuljom njegove derivacije. S obzirom da se radi o bušotini koju se planira refrakturirati, jer je nakon duljeg perioda proizvodnje došlo do smanjenja pukotine, što se očitovalo u opadajućim proizvodnim karakteristikama, glavni cilj mjerenja porasta tlaka jest interpretirati njezinu stvarnu poluduljinu. Ovaj podatak jedan je od ključnih za dizajn postupka novog frakturiranja, kao i za postavljanje novog proizvodnog modela. Na temelju deset provedenih analiza slučajeva, zaključeno je da najtočniji rezultat poluduljine daje model frakturirane bušotine s višefaznim protokom, u iznosu od oko 13 metara.

Abstract (english)

The thesis studies the analysis of a pressure build-up test of the hydraulically fractured well at the selected oil reservoir. For this purpose, the analysis of the build-up test for a vertical well was first theoretically described and then the compliant models for the pressure analysis of fractured wells were developed. The main objective of these tests is to determine the reservoir properties, such as rock permeability and skin factor, but also fracture half-length and conductivity. The Saphir software was used for the analysis. Based on 10 different cases of the same pressure build-up test, the analysis in which the model of a fractured well and reservoir fluid best matches the measured pressure curve and the derivative curve was selected. There is a plan to refracture the well since a reduction in the fracture size was noticed after a long period of production. This reduction was reflected in the declining production characteristics, therefore the main goal of measuring the pressure build-up is to interpret its actual half-length. This is one of the key information necessary for the design of the new fracturing process and for setting up a new production model. Based on 10 conducted case analyses, it was concluded that the most accurate result for fracture half-length is provided by the fractured well model with the multiphase flow, and it is approximately 13 meters.

• Keywords: analiza testa porasta tlaka; hidraulički frakturirana bušotina; program Saphir
• Keywords (english): pressure build-up test analysis; hydraulically fractured well; Saphir software
• Language: croatian
• URN:NBN: urn:nbn:hr:169:517093
• Study programme: Title: Petroleum engineering; specializations in: Petroleum engineering, Energy production and supply, Environmental protection in petroleum engineering; Course: Petroleum engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka naftnog rudarstva (magistar/magistra inženjer/inženjerka naftnog rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-09-20 13:16:18