Optimization of perforated liner parameters in horizontal oil wells

Abstract

Nowadays, horizontal wells play a vital role in the production from thin heavy oil reservoirs. Designing a suitable completion for this kind of reservoirs is a decisive factor to boost the efficiency of durable production. This study deals with the optimization of perforated liner design for horizontal wells in Sarvak oil reservoir, which is located in the southwest of Iran. Sarvak is a carbonate oil reservoir, but it contains shale and mudstone. To avoid solid production and formation collapse, the screen liner was selected as a cost-effective solution. There were two choices, either perforated liner or slotted liner. The perforated liner was selected by finite element analysis and strength checking, which was proven by laboratory experiments. Sensitivity analysis was performed on various perforated parameters such as phase angle, hole density, hole diameter and hole distribution to determine the pattern of the holes so that enough strength of the liner was maintained while maintaining the maximum hole density. Then, parameters of perforated liner were determined by calculated loss of the flowing path, collapse resistance strength and tensile strength of casing pipes after perforated. As a result, hole density, hole size and perforated pattern were selected 100 HPM, 10 mm and 4-thread-line, respectively, in 4 ½” liner with 13.5 ppf. The ratio of the strength of the optimized perforated liner was less than 8% for collapse and 5% for tensile compared to the same specification casing.

Application of underbalanced tubing conveyed perforation in horizontal wells: A case study of perforation optimization in a giant oil field in Southwest Iran

“…The black oil from reservoir X has viscosities up to 4 cp. The primary driving mechanism of the reservoirs is rock and fluid expansion, and the formation is mainly homogeneous (Dastgerdi et al, 2020). The reservoir characteristics of the field is shown in Table 1.…”

“…Perforations are holes in the formation that establish a connection between the wellbore and production zone to achieve optimum productivity (Dastgerdi et al, 2020). Perforation operation typically involves creating several openings from the wellbore through the casing and the cement behind it into the hydrocarbon-bearing zone.…”

Numerical Analysis of Residual Strength in the Perforated Casing of Ultra Deep Wells

“…Zachary et al [5] proposed a novel method for the acquisition of yield strength in the hoop direction and carried out an experimental study through the determination of the tubular yield strength in the hoop direction. In addition, related studies [6][7][8] have analyzed the strength of perforated casings under different working conditions. However, due to different analysis objects, working conditions, experimental conditions and simulation methods, they cannot be closely integrated with actual field data.…”