Single-trip multizone perforation doubles productivity target

Overview

An operator of a development well with multiple sand layers separated by shale of various thickness wanted to perforate all intervals in one run (10 zones with a gross interval of 650 ft). 

Challenge

Long perforation intervals introduce the potential for shock damage to the gun and bottom hole assembly. To mitigate this risk, multiple runs with shorter gun strings might be required. This was not preferable because the first perforation interval would be soaked for a longer period and the operator would incur additional costs associated with rig time. To optimize production potential, the operator wanted the most optimal shaped charge for downhole conditions inside 9 5/8-in. casing to achieve connectivity between the reservoir and wellbore. 

Solution

Halliburton proposed the 450 RockJet™ perforating shaped charge with a single-trip, multizone, 7-in., 12-spf tubing-conveyed perforation (TCP) gun. This shaped charge is optimal for downhole conditions and provides up to 22% deeper penetration, 32% larger EHD, and 83% more area open flow than alternative systems. The perforation program was designed in underbalanced conditions to improve the connectivity between the reservoir and wellbore. Pulsfrac® simulation and the Halliburton Perforating Tool Kit (HPTK) software were used to assess the risk of gun shock during perforation and charge performance in downhole conditions.

Result

With predevelopment perforating design and planning, the operator’s objectives were met without any delay to rig operation. Job execution was flawless with zero HSE or service quality issues. The initial production target was 2,000 BOPD. After perforation and well tests, the maximum productivity was 4,000 BOPD, double the initial target.