«Geology, geophysics and development of oil and gas fields»

Prospects for horizontal wells construction in the fields with a complex geological structure

UDC: 622.276.1/.4.001.57+622.276.342
DOI: 10.33285/2413-5011-2022-3(363)-46-53

Authors:

¹ PJSC TATNEFT named after V.D. Shashin, Almetyevsk, Republic of Tatarstan, Russia
² Ufa State Petroleum Technological University, Branch of the University in the City of Oktyabrskiy, Oktyabrskiy, Republic of Bashkortostan, Russia

Keywords: carbonate rocks, horizontal well, forecast, modeling, multistage hydraulic fracturing, injection, reservoir pressure maintenance system

Annotation:

Today, more and more attention is paid to the development of fields with deteriorated reservoir properties and complex geological structure. The effective development of such fields requires application of the most modern technologies, in particular, drilling of wells with horizontal completion. As a pilot project, two wells with a horizontal section length of 800 and 400 m accordingly were drilled in the Vereiskiy horizon of the considered field using multistage acid fracturing. The pilot project results proved high efficiency of this technology. During the operation of the wells, a high rate of production decline was revealed due to a decrease of reservoir pressure due to the lack of injection and weak connection with the aquifer. Further development of the field requires introduction of injection wells and determine the arrangement of production and injection wells. The optimal location of wells in fields with a complex geological structure is impossible without using geological and hydrodynamic modeling tools. One of the methods applied to determine the optimal placement of production and injection horizontal wells in the Vereiskiy horizon is considered. A set of calculations was carried out on the built hydrodynamic model and three variants were calculated with a different arrangement of production and injection wells and with different grid densities. Based on the results of the work performed, recommendations were given for the further design of the field development.

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