Rationale for the Application of Wells with a Wave-Shaped Horizontal Termination for the Conditions of the Srednebotuobinskoye Field

Introduction. Currently, most of the developed oil deposits are classified as complex fields. The specificity and main difficulties in the development of such deposits are determined by the conditions of occurrence in the productive horizon, which differ sharply in the formation anisotropy, as well as the presence of underlying formation water. The issue of operating wells of complex geometry is especially acute. As a model, a mathematical model developed by the authors is proposed, which makes it possible to describe the inflow to a production well of complex geometry. The results obtained when applying the author’s model and comparing the data with the known formulas for the inflow to a horizontal well showed good convergence. The proposed single-phase inflow model makes it possible to predict the potential flow rate of an undulating well during the development of the Srednebotuobinskoye field.
Materials and methods of research. The paper considers a mathematical model developed by the authors, which makes it possible to describe the inflow to a production well of complex geometry. The results obtained when applying the author’s model and comparing the data with the known formulas for the inflow to a horizontal well showed good convergence. The dependence of well productivity with a wavy trajectory on the anisotropy and the number of sinusoid cycles is shown. The area of application of wells with an undulating trajectory and the application of the proposed single-phase filtration model for predicting the productivity of a undulating well that has penetrated the oil rim of the Botuobinsky horizon with a gas cap and bottom water are determined.
Results and Discussion. The joint solution of the equation for the distribution of reservoir pressure and pressure in the wellbore makes it possible to obtain a system of equations, the solution of which is the flow rates of the well segments. A horizontal well can be considered as a special form of undulating well as the undulation index is zero. The paper proposes a numerical-analytical model for predicting and evaluating the productivity of undulating wells. The results obtained when applying the author’s model and comparing the data with the known formulas for the inflow to a horizontal well showed good convergence. The dependence of well productivity with a wavy trajectory on the anisotropy and the number of sinusoid cycles is shown. A numerical-analytical model is also proposed for predicting and evaluating the productivity of undulating wells.

1. Sokhoshko S.K., Kolev Zh.M. Inflow to a well with a complex wellbore trajectory in a layered reservoir // Oil industry, 2014 No 10 P. 110–112.

2. Mulyavin S.F., Kolev Zh.M., Rogozina T.V. Numerical-analytical model for calculating the productivity of an oil well of complex geometry // Natural and technical sciences, 2021 No 11 P.255–259.

3. Joshi S.D. Augmentation of well productivity with slant and horizontal wells // J of Petrol Techn June, 1988. Р.729–739.

4. Economides M.J., Brand C.W., Frick T.P. Well Configurations in Anisotropic Reservoirs // SPE Formation Evaluation, 1996 No 11(4) Р.257–262 DOI: http://dx.doi.org/10.2118/27980-PA.

5. Butler R.M. Horizontal Wells for the Recovery of Oil, Gas and Bitumen, Petroleum Monograph // Petroleum Society of CIM, 1994. Р.228–235.

6. Furui K., Zhu D., Hill A.D. A Rigorous Formation Damage Skin Factor and Reservoir Inflow Model for a Horizontal Well // SPE Production and Facilities, 2003. No 3. P.151–157.

7. Babu D.K., Odeh A.S. Productivity of Horizontal Well SPE Reservoir Engineering, 1989. No 4(4). Р.417–421 SPE-18334

8. Yula T. Optimization of horizontal well competition Ph.D. dissertation. The university of Tulsa, 2001. Р.233.

9. Penmatcha V.R., Aziz K. A comprehensive reservoir /wellbore model for horizontal wells, SPE India Oil and Gas Conference, New Delhi, India, 1998. SPE 39521. Р.191–204.

10. Elizabeth G.A. Horizontal well productivity and wellbore pressure behavior incorporating wellbore hydraulics. Ph.D. dissertation. Norman, Oklahoma, 2001. 85 p.

11. Goktas B., Ertekin T. A comparative analysis of pressure transient behavior of undulating and horizontal wells // SPE paper 81067 presented at SPE Latin American and Caribbean Petroleum Engineering Conference, Port-of-Spain, Trinidad and Tobago, 27–30 April, 2003. Р.1–8 http://dx.doi.org/10.2118/81067-MS.

12. Grachev S.I., Samoilov A.S. Development of oil fields by horizontal wells: monograph. Tyumen: Tsogu, 2015. 144 p.

13. Kamkom R. Modeling performance of horizontal, undulating, and multilateral wells, Ph.D. dissertation. Texas A&M University, 2007. 69 p.