Optimization of Acid Fracturing Design in Yubei Fractured Reservoir

Abstract

This paper recommends the application of acidic fracturing technology for horizontal wells in Yubei region basing on its fractured reservoir’s characteristics, and the numerical simulation method is used to optimize the parameters of acidic fracturing. According to the results of optimization, the proper acid system is selected, and the construction parameters of acidic fracturing are optimized. According to the results of numerical simulation, we recommend the fracture half-length to be 120m, the fracture conductivity to be 30D.cm, and the fracture number to be 5. According to the properties of reservoir in Yubei region and the optimization results of fracture half-length and fracture conductivity, the alternative injection of crosslinked acid and ordinary gelled acid is recommend. The injection rate of crosslinked acid is 5m3/min, with volume 300m3. The injection rate of ordinary gelled acid is 6m3/min, with volume 300m3.

Experimental Study on the Autogenic Acid Fluid System of a High-Temperature Carbonate Reservoir by Acid Fracturing

“…In order to solve these difficulties, technicians at home and abroad have carried out in-depth research on the unconventional acid system. The thickener and crosslinking agent in crosslinking acid can generate high strength stereoscopic network gel through crosslinking, which can effectively reduce the reaction speed of acid rock, improve the penetration depth and the conductivity of acid erosion fracture, and prolong the validity period of acid compression. − Emulsified acid is a multiphase system composed of an oil phase and acid phase. It has high viscosity, good filtration reduction, slow speed effect, strong corrosion ability, and small corrosion and does little damage to the strength of pipe string.…”