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Evaluating Hydraulic Fracturing In Open Holes Using Proppant Doped With NMR Relaxation Agent

IP.com Disclosure Number: IPCOM000239432D
Publication Date: 2014-Nov-06
Document File: 1 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database

Abstract

Hydraulic fracturing is widely used in the petroleum industry to produce desired hydrocarbons from formations with low permeability, such as shale formations. It is of great interest to understand the injection profile and to determine the fracture locations. Conventionally, to detect the induced fractures in the near wellbore region, nuclear or acoustic technologies are used. Small amount of radioactive tracers were added to the proppant slurry for nuclear detection. These radioactive materials may bring concerns for the environmental and safety issues. We propose here a viable alternative, utilizing proppant doped with NMR relaxation agent for the fracture detection using NMR in open holes. NMR logging has been extensively used for the determination of porosity and permeability via relaxation measurements, and relaxation agents such as Manganese Oxide were introduced to kill the water signal by altering its relaxation rate. We propose to incorporate these paramagnetic agents such as Gd2O3, MnCl2 and MnO into conventional proppant for NMR detection. Once the modified proppants stay within a fracture, the relaxation rate of the fluid around them will be dramatically increased. This change will be an indicator of the fracture when comparing the logging data acquired before and after hydraulic fracturing. Moreover, since NMR is a powerful tool of fluid typing, the proposed method could be potentially applied to determining if the fractures locate within areas of interest for hydrocarbon production. The proposed method includes 1) first NMR logging pass. 2) hydraulic fracturing using proppants doped with NMR relaxation agent. 3) second NMR logging pass. 4) analyzing NMR data from the two passes before and after fracking to determine the fracture location and fluid types around fractures . The outcome method will be a safe and reliable alternative for hydraulically induced fracture evaluations.

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Title:

Evaluating hydraulic fracturing in open holes using proppant doped with NMR relaxation agent

Description:

Hydraulic fracturing is widely used in the petroleum industry to produce desired hydrocarbons from formations with low permeability, such as shale formations. It is of great interest to understand the injection profile and to determine the fracture locations. Conventionally, to detect the induced fractures in the near wellbore region, nuclear or acoustic technologies are used. Small amount of radioactive tracers were added to the proppant slurry for nuclear detection. These radioactive materials may bring concerns for the environmental and safety issues. We propose here a viable alternative, utilizing proppant doped with NMR relaxation agent for the fracture detection using NMR in open holes. NMR logging has been extensively used for the determination of porosity and permeability via relaxation measurements, and relaxation agents such as Manganese Oxide were introduced to kill the water signal by altering its relaxation rate. We propose to incorporate these paramagnetic agents such as Gd2O3, MnCl2 and MnO into conventional proppant for NMR detection. Once the modified proppants stay within a fracture, the relaxation rate of the fluid around them will be dramatically increased. This change will be an indicator of the fracture when comparing the logging data acquired before and after hydraulic fracturing. Moreover, since NMR is a powerful tool of fluid...