Improvement of formation hydraulic fracturing technologies for development of the upper Jurassic deposits in the Western Siberia
UDC: 622.276.66
DOI: -
Authors:
REVYAKIN ODISSEY V.
1,
ANKUSHEV YAROSLAV E.1,
KAZAK ROMAN P.1,
PARSHIN NIKOLAY V.1
1 LUKOIL-Engineering, Moscow, Russia
Keywords: the Western Siberia, hard-to-recover reserves, multi-stage hydraulic fracturing, "beaded injection" technology, pilot projects, monitoring and analysis of efficiency, graphical risk analysis method
Annotation:
The results of the activities on the development of the most effective methods of multi-stage hydraulic fracturing (MSHF) of hard-to-recover oil reserves in the Western Siberian region were analyzed.
As part of the pilot program (PP), MSHF was performed in 19 wells with horizontal completion in the form of a non-cemented liner with a sliding sleeve system. Each well had an average of 15 stages. Depending on the goals set, a total of four different hydraulic fracturing options were implemented at the wells:
– using a linear gel as the main fluid;
– using a cross-linked gel as the main fluid;
– "beaded injection";
– "beaded injection" with Combo-slag.
Based on the PP results, the optimal MSHF designs for the object being developed, implementation examples, the obtained geometric parameters of the MSHF fractures and the production characteristics of the wells after treatments are presented.
Wells with hydraulic fracturing performed using the "beaded" injection technology prove stable performance characteristics; the oil flow rate stabilizes and reaches a "plateau" with further preservation of production characteristics during the first six months after well commissioning. The "beaded" injection technology is safer than the linear gel injection due to the possibility of maintaining the hydraulic width of the fracture by supplying cross-linked gel packs as well as by varying its volumes, if necessary, in real time. At the same time, it is possible to preserve the geometric parameters of the fracture, creating a half-length that exceeds the half-length obtained by pumping only cross-linked gel by 3...4 times.
An approach to improving the quality of monitoring the multi-stage hydraulic fracturing implementation in real time is presented. A method for graphical risk analysis is presented, based on a set of small-volume test injections, without increasing time and resource costs.
At present, it is planned to develop full-fledged software for experimental implementation in the support process and further improvement of the monitoring program functionality.
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