Approaches to planning multi-stage fracking operation on the example of Jurassic formation of Uryevskoye field
Key words: acoustic logging, Poisson's coefficient, geomechanical model
Authors: M.V. Chertenkov (LUKOIL-Engineering LLC, RF, Moscow)
With the deterioration of the structure of reserves,
the development of new types of complicated reservoir with permeability
heterogeneity both along strike and vertically, the irregularity of placement
remaining oil reserves increases. To enhance the coverage and improve the
uniformity of reserves development technology of horizontal wells is applied.
The practice shows that drilled horizontal stems not completely work over its
entire length. Multi-zone fracturing technology allows to involve not previously
drained oil reserves. According to the experience of multi-zone fracturing the
orientation of the hydraulic fracture (subparallel to the trunk or
subperpendicularly to wellbore) determines the success of the operation is.
When designing multi-zone fracturing it very important to use geomechanical
models for monitoring the direction of propagation of cracks. Period of
water-free operations depends on location of cracks relative to the front of
flooding. Analysis of microseismic monitoring data shows cracks shielding
effect during the multi-zone fracturing operations. This effect is based on the
change in hydraulic fractures direction as a consequence of the presence of
perturbed stress field from the first operations. This effect is especially
intensive in formations with little contrast between the minimum and maximum
stress, as well as in case the of significant tectonic component absence. These
properties characterize the majority of fields in Western Siberia. In this
article on the example of field Uryevskoye the author shows the approaches to
reduce the effect of turning the cracks when multi-zone fracturing.
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