Abstract
In hydraulic fracturing operations, pressure pumping companies have long required a mechanism to relieve overpressure events prior to damage occurring to the systems. Traditionally, pressure pumpers have used mechanical or hydro-mechanical devices that are either one-time use, such as burst disc, or springs under compression. Both systems have fundamental disadvantages in the context of efficient and cost effective operations. There is also the case that if the well requires pressure operations within the setting tolerances of these systems, they are not employed at all, risking overpressure damage to frac iron or wellhead equipment.
This paper introduces a new method of pressure threshold assurance, with a pressure monitoring system that is responsive enough to control a new design of rapid acting hydraulic valve actuator. In this application, this is mated with a standard gate valve that is installed on a bleed off leg from the frac flow lines. This allows very fast acting pressure relief, proactively protecting the system against costly over pressure events and potentially averting screen outs.
A discussion of the design and function of the new solution, with due regard to limitations, best practices and workflows will be demonstrated, providing an examination of the results of operational case histories. Some of the benefits that have already been realized, and the potential for further implementation are proposed, as well as highlighting operational differences vs current technology that deliver value to pressure pumpers and operators.
With a proven ability to relieve pressure within very tight tolerances, this new system allows for operational gains associated with resetting the system and retaining system integrity, but also allows operators to pump jobs in a much tighter pressure window than before. Unexpected benefits are that lower pressure wellhead equipment can be safely used without risk of costly integrity issues. Other examples of how this system provides surety to pressure pumping operations are examined.
