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Stimulation of reservoir and induced microseismicity - Zurich, Switzerland, Workshop3
Stimulation of reservoir and induced microseismicity - Zurich, Switzerland, Workshop3
from 29 June 2006 to 01 July 2006 Kartause Ittingen, Switzerland
Hydraulic fracturing in the hydrocarbon industry
This presentation will give some recent developments in the hydraulic fracturing 
design, application and evaluation procedures in the oil and gas industry. 

Depending on the reservoir, hydraulic fracture treatments have as a goal either to 
bypass damaged permeability close to the well, or to create additional contact area 
between the reservoir and the well. While for the first goal the key is to maximize 
the fracture conductivity and thus the fracture width in the vicinity of the 
wellbore, the second goal requires large fractures, preferably connecting to an 
already existing network of natural fractures. Typically, such massive hydraulic 
fractures are placed in low-permeability reservoir. 

The successful placement of a propped hydraulic fracture depends critically on the 
quality of the design input data. Such data contain knowledge about the in-situ 
stresses, the reservoir permeability, the elastic parameters, and the fracture 
propagation criteria. Minifrac tests are designed to disclose such parameters. To 
this end, the time-dependent behaviour of the pressure after a short injection test 
above the fracture pressure is analysed with specially designed software. Further 
important knowledge is the containing capacity of different layers in the 
subsurface, as these determine the height / length ratio of the fracture. A profile 
of the parameters, required to assess this, is still often difficult to obtain. 

Even with good design input data and a properly operated fracturing treatment, the 
results are not always in line with the predictions. Knowledge is usually built up 
in specific areas during subsequent hydraulic fracturing treatments and their 
careful evaluation. One method that can help considerably in this evaluation is 
tiltmeter mapping, by which the non-seismic displacements during the fracturing 
operation are measured and inverted determine the dimensions of the created fracture.
Id: 24
Place: Kartause Ittingen, Switzerland
CH-8532 Warth TG
Starting date:
29-Jun-2006   14:40
Duration: 20'
Primary Authors: FOKKER, Peter A. (TNO)
Presenters: FOKKER, Peter A.
Material: paper Paper
slides Slides

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