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Water Hammer Re-Frac for Shale

IP.com Disclosure Number: IPCOM000247870D
Publication Date: 2016-Oct-07
Document File: 2 page(s) / 265K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention relates to a tool for re-fracking existing depleted shale wells. The difficulty with re-fracking these wells is isolating the perforations to be fracked. Today packers are used to straddle the targeted perforations. However, these systems are very complex. The new system uses a water hammer to force fluid into the target perforations and also draw debris out of adjacent perforations. The tool consists of a valve which blocks annular flow when a pre-determined flow rate is reached. The valve is run into the well on tubing such that the valve straddles the target perforations then fluid is pumped down the annulus. The valve closes at a predetermined flow rate which creates a water hammer. The water hammer creates a high pressure pulse upstream of the valve and a low pressure pulse downstream. The high pressure pulse forces fluid into the perforations upstream of the valve and the low pressure pulse draws debris out of the perforations downstream adjacent to the valve. Only the perforations directly adjacent to the valve will be effected by the water hammer. The valve opens after the fluid flow is stopped then closes again when the predetermined flow rate is reached. This cycle repeats continually

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Water Hammer Re-Frac for Shale

    This invention relates to a tool for re-fracking existing depleted shale wells. The difficulty with re-fracking these wells is isolating the perforations to be fracked. Today packers are used to straddle the targeted perforations. However, these systems are very complex. The new system uses a water hammer to force fluid into the target perforations and also draw debris out of adjacent perforations. The tool consists of a valve which blocks annular flow when a pre-determined flow rate is reached. The valve is run into the well on tubing such that the valve straddles the target perforations then fluid is pumped down the annulus. The valve closes at a predetermined flow rate which creates a water hammer. The water hammer creates a high pressure pulse upstream of the valve and a low pressure pulse downstream. The high pressure pulse forces fluid into the perforations upstream of the valve and the low pressure pulse draws debris out of the perforations downstream adjacent to the valve. Only the perforations directly adjacent to the valve will be effected by the water hammer. The valve opens after the fluid flow is stopped then closes again when the predetermined flow rate is reached. This cycle repeats continually.

    The tool consists of a valve which blocks annular flow when a pre-determined flow rate is reached. The valve is run into the well on tubing such that the valve straddles the target perforations then fluid is pumped down the ann...