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METHOD TO MEASURE THE PROPPED DIMENSIONS OF HYDRAULIC FRACTURES

IP.com Disclosure Number: IPCOM000249119D
Publication Date: 2017-Feb-07
Document File: 4 page(s) / 98K

Publishing Venue

The IP.com Prior Art Database

Abstract

[0001] The subject disclosure relates to the field of well stimulation by hydraulic fracturing, more precisely with the imaging of the propped dimensions of a hydraulic fracture using highly conductive materials.

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METHOD TO MEASURE THE PROPPED DIMENSIONS OF HYDRAULIC FRACTURES

[0001] The subject disclosure relates to the field of well stimulation by hydraulic fracturing,

more precisely with the imaging of the propped dimensions of a hydraulic fracture using highly

conductive materials.

[0002] The subject disclosure relates to using high conductive graphitic materials (e.g. carbon

nanotubes and/or carbon fiber and/or graphene) in combination with conventional proppant (e.g.

sand, ceramic proppant etc.), or as a sole propping agent during a hydraulic fracturing job. Once

such highly conductive slurry has been placed downhole an electromagnetic measurement (single

well wireline tool such as the CHFR or cross-well EM techniques) is performed in order to image

the EM anomaly created by the placed highly conductive proppant and perform an inversion to

determine the dimensions of the propped fracture. Note that a baseline measurement prior to the

hydraulic fracturing job may be required in order to better image the fracture.

[0003] Steps of the proposed method

1. Baseline EM measurements (logs, prior X-well survey) for better imaging (optional).

2. Mixing of high conductive materials with or without conventional propping agents in a

fracturing fluid (Note that the proppant blend could be prepared off location, or even the

complete slurry).

3. Pumping of the created slurry in a typical fluid pumping sequence of a fracturing job.

4. Repeat steps 1-2 in the context of a multi-stage stimulation of a well if desired.

5. Measure the EM response post fracturing job using either a wireline measurements or X-

well EM measurements.

6. QC and Analysis of the acquired EM data, perform data inversion to determine the

dimensions of the propped fracture

[0004] A similar method is where the EM measurements (step 6) are performed continuously

during the fracturing job (during step 3 & 4) therefore producing a time-lapse image (by means of

an inversion) of the propped part of the growing fracture.

[0005] The method can be used in vertical, horizontal and deviated wells. The use of cross-

well EM technology would require one or more monitoring wells near the stimulated well.

[0006] Graphene and carbon nanotubes are two allotropic forms of carbon. Graphene is a

single planar sheet of carbon atoms bonded, via sp2 hybrid orbitals, to give a 6 atoms rings

honeycomb. Carbon nanotubes (CNTs) can be described as sheets of graphene rolled up in a

cylindrical shape (diameter in the range of 0.8-100 nm, length from few nanometers up to

centimeters). In the case of an individual tube these are single wall carbon nanotubes (SWCNTs),

otherwise, if there are several concentric tubes these are multi wall carbon nanotubes (MWCNTs).

Both graphene and carbon nanotubes have exceptional chemo-physical and mechanical properties.

From an electrical point of view both graphene and CNTs behave as metal conductors (SWCNTs

can behave as semiconductors as well depending on diameter and chirality). Moreov...