Ensuring the sustainability of the clay deposits in horizontal wells Samaraneftegaz

Authors: A.S. Nechaev, A.V. Semin (Samaraneftegas JSC, RF, Samara), B.A. Rastegaev, O.V. Nozhkin, V.A. Kapitonov (SamaraNIPIneft LLC, RF, Samara), I.V. Dorovskikh (Samara State Technical University, RF, Samara)

Key words: horizontal well, stability clay deposits, abnormally high reservoir pressure, horizontal tension.

The article sets out the methodology for determining pore pressure intervals clay deposits. The authors present results of research of dispersing power and influence of the inhibiting additives by Chenevert’s method. Comparison of the inhibitory potency of the studied drilling fluids systems is given. The rock pressure, the minimum and maximum horizontal stress is calculated. The results obtained allowed to optimize the parameters of the washing (density, rheology, filtration, the inhibitory properties of drilling fluids), to offer optimal well trajectories that eventually allowed to propose regulations for accident-free drilling of horizontal wells Samaraneftegas JSC in unstable clay sediments.

References

1. Rastegaev B.A., Kapitonov V.A., Inhibition of hydration of clay deposits

(In Russ.), Proceedings of International scientific-practical conference

“Ashirovskie chteniya”, Samara: Publ. of SamSTU, 2012, V. 2, pp. 5-12.

2. Certificate of authorship no. 1222670 MKI S09K7/00, Sposob otsenki ingibiruyushchikh svoystv burovykh rastvorov (A method of evaluating the inhibitory properties of drilling fluids), authors: Pen'kov A.I., Penzhoyan A.A., Koshelev V.N.

3. Chenevert V.E., Glycerol mud additive provides shale stability, Oil and

Gas J., 1987, no. 29, pp. 60-64.

4. Maas A.F., Andresson B.A., Penkov A.I. et al., Complex inhibitor drilling mud for drilling deep wells in complicated conditions, Petroleum Engineer International, 1999, August, pp. 51-57.

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