Drillable Perforating System Saves Effort and Rig Time

摘要

This case-history paper presents accounts of several fieldapplications of a drillable perforating system (DPS) that hasbeen used on 400 jobs in the Gulf of Mexico, with a near-100% success rate.Components of the drillpipe-conveyed system are bothdrillable and disposable. The aluminum gun is mounted belowa drillable packer. After perforating, the packer and gun can bedrilled out by conventional drilling methods. There are nomobilization or demobilization charges such as thoseassociated with use of wireline units. Because no mud systemis needed for the operation, clear fluids can remain in place forworkover operations. Once in place, the firing head is actuatedby pump pressure applied through the tubing.The paper describes use of the system to perforateunderbalanced, perform plug-to-abandon operations, performblock squeezes, and perform other operations. The DPS can beused to cement and perforate in underbalanced conditions,limited-entry in-flow testing, cementing with clear fluids, andplugging and abandoning wells.The paper presents results that show the DPS to be aneffective alternative to conventional perforation and squeezingmethods now followed in the oil and gas industry. In casehistories presented, significant rig time was saved, along withsavings in material and time to first sale after application. DPSoffers several advantages over conventional equipment andtechniques.1. Clear fluids can remain in place during workoveroperations because no mud system is needed for wellcontrol.2. The DPS is a cost-effective and safe alternative totraditional methods of squeeze perforating.3. The DPS assembly is a one-trip perforating, packerplacement,and squeeze-cementing method that caneliminate a great amount of rig-time expense.