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

Practical problems solved during special geophysical studies to optimize hydraulic fracturing

UDC: 622.276.66
DOI: -

Authors:

¹ LUKOIL Engineering LLC, Kogalym, Russia

Keywords: hydraulic fracturing, well logging, direction of hydraulic fracturing crack propagation, anisotropy, stress state of rock, azimuth of crack propagation, cross-dipole acoustic logging

Annotation:

High degree of reserves development, accompanied by increased water-flooding of recoverable products as well as an increase of hard-to-recover hydrocarbons share are complicating factors when implementing hydraulic fracturing operations (HF) – the main type of geological and technical measures (GTM) that provides maximum increases of hydrocarbon production.

HF not only helps to intensify oil flow from low-permeable reservoirs, but also, with correct and thoughtful planning, makes it possible to connect previously non-drained reserves to filtration processes, while avoiding breakthroughs of the HF crack into undesirable water-saturated areas of the productive formation.

The authors of the article analyze the results of geophysical well logging using the cross-dipole broadband acoustic logging (CDAL) method, carried out at the fields of LUKOIL-Western Siberia LLC. Geophysical studies were conducted to determine the direction of man-made cracks development, formed during hydraulic fracturing, changes of anisotropy indices after hydraulic fracturing, as well as other tasks aimed at increasing the efficiency of hydraulic fracturing operations.

The results of the performed analytical work proved the fact that the application of special well logging technologies using the cross-dipole broadband acoustic logging methods allow for the most optimal design and implementation of hydraulic fracturing, minimization of undesirable risks during its implementation and the use of a rational approach when planning hydraulic fracturing operations in the future for each specific section of the reservoir.

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