... Abstract The performance of acid fractured wells depends on the conductivity distribution along the acid penetration length, which is a function of reservoir properties, treatment design and execution. The previously published models for fractured well performance assume constant fracture...

... Abstract The classical theoretical framework of fracture conductivity for rough acid-etched surfaces is the Nierode and Kruk correlation, given by an exponential equation of two parts: the conductivity under zero closure stress and the rate of conductivity change with closure stress. The first...

... Abstract Acid fracturing is a stimulation process in which the dissolution of formation rock leaves unevenly etched fracture faces that creates lasting conductivity after fracture closure. The success of acid fracturing depends on the conductivity created and retained under overburden stress...

... Predicating the conductivity of acid fracture is not possible using analytical or numerical models due to stochastic nature of acid reaction with rock and complex leak-off behavior of acid. Other alternatives are either empirical correlations or conducting experiments mimicking field treatments...

... Abstract While experimental studies have shown acid type significantly influences resulting fracture conductivity, there has been limited work on how fluid properties relate to etched fracture faces and hence the resulting conductivity. The effects of acid solutions injected into hydraulic...

...Analysis Techniques. Abstract In acid fracturing, while the near wellbore area of the fracture receives fresh, unspent acid, sections of the fracture further down the length receive partially spent acid due to reaction of acid. As a result, there is a distribution of acid concentration along...

... Abstract In the acid fracturing process, the fracture conductivity created by acid etching of the fracture walls is due to the surface roughness created by the acid's non-uniform dissolution of the fracture surfaces. The acid fracture conductivity is dependent on surface etching patterns, which...

... in vertical depth from the original surface after acid injection, and also to characterize the etching patterns (wormholes and channels) on the fracture surface. Rock embedment strength was carefully measured before and after each experiment, and the strength change was then related to the resulting...

... Abstract This paper will present the development novel temperature control viscosity acid (TCA) technique that uses for acid fracturing in Ordovician formation in TZ region of TARIM, China. The Ordovician formation in TZ field is extreme heterogeneous carbonate with naturally fractures...

... ). Finally, rock samples were moved to the fracture conductivity test apparatus ( Fig. 5 ) for acid fracture conductivity determination. The load frame applied closure stress to the rock samples while nitrogen flowed through the acid fracture. A flowmeter was used to monitor the nitrogen rate. Median...

... tubulars. materials and corrosion magnesium acid concentration driweesh acidizing corrosion management flowline corrosion spe 84925 flowback sample oilfield chemistry iron concentration gelled acid hydraulic fracturing production chemistry upstream oil & gas hcl 9 subsurface...

... Abstract TARIM is the largest basin abundant in carbonate reservoirs in China. Acid fracturing is the main technology for exploration and development in TARIM carbonate reservoirs, which featured with great depth (4500–7200m), high temperature (250–320F Degrees) and extreme heterogeneity due...

... Abstract The effects of acid solutions injected into hydraulic fractures created in carbonate formations can be assessed at the laboratory scale in acid fracture conductivity tests that mimic the conditions in an actual acid fracture treatment. We conducted a series of acid fracture...

... Abstract In an acid fracturing treatment, fracture conductivity is created by differential etching of the fracture surface by the acid – without non-uniform dissolution along the fracture face, the fracture will close after pumping ceases, and little lasting conductivity is created. In spite...

... the production rates were rapidly decreased after a short time because the near-wellbore basement was re-damaged of producer wells. To eliminate the above problems, this study has presented the optimal acid fracture treatment design with an acid HCl concentration of 15%. The program of acid fracture treatment...

... Abstract Modeling of acid fracturing process is challenging because of the coupled complex effects of flow through porous media and fractures, chemical reaction in a geostatistical base, wormhole propagation, and reservoir heterogeneity. To avoid the complexity, decoupled approaches...