A geomechanical analysis of the influence of orientation and placement of jet slots on terrigenous reservoir permeability

S. G. Ashikhmin, S. E. Chernyshov, Yu A. Kashnikov, D. I.M. MacDonald

Research output: Contribution to journalReview article

Abstract

The paper presents the results of a geomechanical analysis of the effects of the placement and orientation of jet slot channels on the well-bore area permeability of terrigenous reservoir in producing oil wells in the Perm region. Various scenarios for the formation of jet slot channels in the reservoir were outlined and assessed; the stress-strain state of the rocks was determined; and the effect of "unloading" on the permeability of rocks and the stability of the slot channels was assessed. The unloading of the rock mass near the jet slots was estimated from changes of average effective pressure. It was established that the best placement scheme for jet slot channels is a system of four slot channels with a phasing of 90°. The height difference between jet slots channels does not appear to be significant, because the slot channels interact with each other very weakly in the vertical direction. The influence of unloading of the rocks on the permeability of the reservoir at a pressure drawdown of 5 MPa was calculated. Functional dependence of all-round effective pressure on the permeability was based on the results of rock tests of the terrigenous reservoirs of the Shershnevskoye oil field. It is demonstrated that without additional work, reservoir permeability is significantly reduced during well exploration under specified conditions; however, the abrasive jet perforation effectively contributes to preservation of the initial permeability. It was also found that jet slot channels in the productive layers with the correct physicomechanical properties and the depression of 5 MPa are stable, since zones of inelastic deformations are very rare. Thus, in addition to increasing the filtration area in the well-bore-reservoir system, the abrasive jet perforation ensures the preservation of the reservoir permeability due to unloading of rocks from the operating stresses. The additional positive effect of the proposed technology is the possibility of azimuth orientation of the jet slots channels for different stress scenarios.

Original languageEnglish
Pages (from-to)132-135
Number of pages4
JournalNeftyanoe khozyaystvo - Oil Industry
Volume2018
Issue number6
DOIs
Publication statusPublished - 1 Jun 2018

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Rocks
Unloading
Petroleum reservoirs
Abrasives
Well perforation
Oil wells
Oil fields

Keywords

  • Hydro-geomechanics of reservoir rocks
  • Perforation work
  • Producing oil well
  • Stress strain state of rocks

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

A geomechanical analysis of the influence of orientation and placement of jet slots on terrigenous reservoir permeability. / Ashikhmin, S. G.; Chernyshov, S. E.; Kashnikov, Yu A.; MacDonald, D. I.M.

In: Neftyanoe khozyaystvo - Oil Industry, Vol. 2018, No. 6, 01.06.2018, p. 132-135.

Research output: Contribution to journalReview article

Ashikhmin, S. G. ; Chernyshov, S. E. ; Kashnikov, Yu A. ; MacDonald, D. I.M. / A geomechanical analysis of the influence of orientation and placement of jet slots on terrigenous reservoir permeability. In: Neftyanoe khozyaystvo - Oil Industry. 2018 ; Vol. 2018, No. 6. pp. 132-135.
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abstract = "The paper presents the results of a geomechanical analysis of the effects of the placement and orientation of jet slot channels on the well-bore area permeability of terrigenous reservoir in producing oil wells in the Perm region. Various scenarios for the formation of jet slot channels in the reservoir were outlined and assessed; the stress-strain state of the rocks was determined; and the effect of {"}unloading{"} on the permeability of rocks and the stability of the slot channels was assessed. The unloading of the rock mass near the jet slots was estimated from changes of average effective pressure. It was established that the best placement scheme for jet slot channels is a system of four slot channels with a phasing of 90°. The height difference between jet slots channels does not appear to be significant, because the slot channels interact with each other very weakly in the vertical direction. The influence of unloading of the rocks on the permeability of the reservoir at a pressure drawdown of 5 MPa was calculated. Functional dependence of all-round effective pressure on the permeability was based on the results of rock tests of the terrigenous reservoirs of the Shershnevskoye oil field. It is demonstrated that without additional work, reservoir permeability is significantly reduced during well exploration under specified conditions; however, the abrasive jet perforation effectively contributes to preservation of the initial permeability. It was also found that jet slot channels in the productive layers with the correct physicomechanical properties and the depression of 5 MPa are stable, since zones of inelastic deformations are very rare. Thus, in addition to increasing the filtration area in the well-bore-reservoir system, the abrasive jet perforation ensures the preservation of the reservoir permeability due to unloading of rocks from the operating stresses. The additional positive effect of the proposed technology is the possibility of azimuth orientation of the jet slots channels for different stress scenarios.",
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AB - The paper presents the results of a geomechanical analysis of the effects of the placement and orientation of jet slot channels on the well-bore area permeability of terrigenous reservoir in producing oil wells in the Perm region. Various scenarios for the formation of jet slot channels in the reservoir were outlined and assessed; the stress-strain state of the rocks was determined; and the effect of "unloading" on the permeability of rocks and the stability of the slot channels was assessed. The unloading of the rock mass near the jet slots was estimated from changes of average effective pressure. It was established that the best placement scheme for jet slot channels is a system of four slot channels with a phasing of 90°. The height difference between jet slots channels does not appear to be significant, because the slot channels interact with each other very weakly in the vertical direction. The influence of unloading of the rocks on the permeability of the reservoir at a pressure drawdown of 5 MPa was calculated. Functional dependence of all-round effective pressure on the permeability was based on the results of rock tests of the terrigenous reservoirs of the Shershnevskoye oil field. It is demonstrated that without additional work, reservoir permeability is significantly reduced during well exploration under specified conditions; however, the abrasive jet perforation effectively contributes to preservation of the initial permeability. It was also found that jet slot channels in the productive layers with the correct physicomechanical properties and the depression of 5 MPa are stable, since zones of inelastic deformations are very rare. Thus, in addition to increasing the filtration area in the well-bore-reservoir system, the abrasive jet perforation ensures the preservation of the reservoir permeability due to unloading of rocks from the operating stresses. The additional positive effect of the proposed technology is the possibility of azimuth orientation of the jet slots channels for different stress scenarios.

KW - Hydro-geomechanics of reservoir rocks

KW - Perforation work

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KW - Stress strain state of rocks

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SN - 0028-2448

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