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Pressure Pumping and Transient Analysis for Detecting Open/Closure of Hydraulic Fracture Stage

IP.com Disclosure Number: IPCOM000240614D
Publication Date: 2015-Feb-12
Document File: 2 page(s) / 15K

Publishing Venue

The IP.com Prior Art Database

Abstract

Hydraulic fracture stages may close at the perforation zones due to overflusing or sinking of propants. The closed fracture stages will have no contribution to the production of hydrocarbons in unconventional reservoirs. To optimize the gas/oil production in unconventional reservoirs, reservoir engineers need to detect the status of propped fractures. To detect the disconnection between the perforation zone and a hydraulic fracture stage we propose the new ideas of pressure pumping and pressure transient analysis. The idea of the pressure pumping is to use the straddle packers to isolate the target perforation zone, which is associated with the fracture stage. A certain amount of fluid is pumped into the isolated perforation zone. After the pressure pumping, it will take the time to wait for the establishment of the drawdown transient. Both the buildup and drawdown transients are measured. The measured transients will be analyzed with the single well model to determine the well skin. If the estimated well skin is negative, the hydraulic fracture stage is open. If the estimate well skin is positive, the fracture stage is closed. This idea is applicable to a vertical/slant/horizontal/multi-lateral well in tight gas sand, or shale gas, or shale oil reservoirs.

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SMP4-55958

Title:

Pressure Pumping and Transient Analysis for Detecting Open/Closure of Hydraulic Fracture Stage

Abstract:

Hydraulic fracture stages may close at the perforation zones due to overflusing or sinking of propants.  The closed fracture stages will have no contribution to the production of hydrocarbons in unconventional reservoirs.  To optimize the gas/oil production in unconventional reservoirs, reservoir engineers need to detect the status of propped fractures.  To detect the disconnection between the perforation zone and a hydraulic fracture stage we propose the new ideas of pressure pumping and pressure transient analysis.  The idea of the pressure pumping is to use the straddle packers to isolate the target perforation zone, which is associated with the fracture stage.  A certain amount of fluid is pumped into the isolated perforation zone.  After the pressure pumping, it will take the time to wait for the establishment of the drawdown transient.  Both the buildup and drawdown transients are measured.  The measured transients will be analyzed with the single well model to determine the well skin.  If the estimated well skin is negative, the hydraulic fracture stage is open.  If the estimate well skin is positive, the fracture stage is closed.  This idea is applicable to a vertical/slant/horizontal/multi-lateral well in tight gas sand, or shale gas, or shale oil reservoirs.

Description:

The traditional production logging and pressure transient analy...