Experience in microseismic monitoring of multi-stage fracturing by RN-Yuganskneftegas LLC (Russian)

Abstract

The pdf file of this paper is in Russian.

In 2016, RN-Yuganskneftegas LLC performed numerous surveys of various types in the areas developed by horizontal wells with multi-stage fracturing (MSF HW) including a series of downhole microseismic monitoring studies. Fracture propagation information obtained from downhole microseismic monitoring is of great interest due to the lack of alternate direct fracturing monitoring methods, and lack of similar studies in Russia. This paper presents the results of three microseismic investigations at Prirazlomnoye and Priobskoye fields. It demonstrates effectiveness and feasibility of commercial application of microseismic monitoring during fracturing aimed at optimization of horizontal drilling, fracturing designs and field development in general. Microseismic monitoring of fracturing operations in horizontal wells of Priobskoye and Prirazlomnoye fields enabled the determination of the actual directions of fracture propagation, achievable fracture sizes and interaction of fractures developing from neighboring frac ports. The first in Russia successful fracturing monitoring in two observation wells simultaneously was performed at Prirazlomnoye field, which enabled to increase the fracture mapping area and determine the significant influence of offset wells on the fracture pattern symmetry. Fracturing monitoring operations at Priobskoye field were record-breaking for Russia: over 1,200 microseismic events were registered and located during 5 fracturing stages. The paper also provides recommendations on the selection of optimum candidate wells, well preparation, and noise reduction for improved seismic data quality.