Horizontal Well Volumetric Fracturing Technology Integrating Fracturing-Energy Enhancement for Tight Oil in Daqing Oilfield

Abstract

The elastic development or water flooding of tight oil reservoir in Daqing oilfield is not effective, and it is difficult to establish an efficient displacement percolation system after production, and the reservoir energy cannot be effectively supplemented, leading to rapid production decline and low stage recovery. Based on the understanding of imbibition mechanism and the analysis of the main influencing factors, the technology and method of increasing reservoir energy and improving fracture-controlled volume are put forward. By referring to the core concept of volumetric fracturing technology, through the combination of laboratory experiments and numerical simulation, with the goal of increasing EUR of a single well, personalized fracture placement strategy was developed according to the fine division of reservoir types, the enhanced energy fracturing fluid system was optimized and evaluated, and the key parameters of the volumetric fracturing technology for fracturing and energy Enhancement were optimized. An integrated fracturing energy enhancement and production enhancement technology with the core of pre-frac energy supplement, multi-stage temporary plugging steering during fracturing, and post frac imbibition replacement is formed. The average daily oil gain in the initial stage of horizontal Wells tested in field is 19.0t, and the application effect is remarkable. This technology can provide technical reference for the efficient development of the same type of unconventional tight oil.

Copyright 2023, IFEDC Organizing Committee. 

This paper was prepared for presentation at the 2023 International Field Exploration and Development Conference in Wuhan, China, 20-22 September 2023.

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