The fracture-hole description method of carbonate reservoir is different from that of
conventional sandstone reservoir, the reservoir understanding, exploration and development
are very difficult. This project abandons the traditional well testing interpretation, and
intends to study a new set of theories and methods of well testing interpretation for
fracture-hole reservoir. Starting from the three conservation laws satisfied by continuum
mechanics (mass conservation, momentum conservation and energy conservation), fully
considering the characteristics of bedrock, fracture and hole in formation, establishing the
corresponding flow equation and finding the solution method of flow equation. The well
testing analysis method of Ordovician fracture-hole reservoir in Tahe Oilfield is carried
out, which provides a theoretical basis for well testing interpretation of fracture-hole
reservoir.
The flow equations of wellbore, hole and formation are
established by using three conservation laws, and the problem of well testing analysis of
fracture reservoir that wellbore-hole connected is solved.
The theory pressure change in the hole is the coupling of flow
and pressure fluctuation is presented for the first time, the equation of pressure
satisfaction under the coupling of flow and pressure fluctuation is given, and the
expression of pressure difference between hole and wellbore is obtained.
The hole in the formation is considered as the source sink term,
and the strength of the source sink and the distance to the wellbore are explained by well
testing analysis. The source and sink strength is transformed into the volume of the hole by
reservoir engineering method.
The well testing interpretation method of fracture-hole reservoir
is put forward. The well testing models of well-hole, well-hole-hole and
well-hole-fracture-hole are established, and the well testing analysis char/method are
obtained.
With the development and production of carbonate reservoirs, well testing analysis and
productivity evaluation of fracture-hole reservoirs have attracted more and more attention,
and related research papers have emerged. Although a large number of academic research has
been carried out on well testing and productivity of carbonate reservoirs domestic and
abroad, it can not solve the problem of carbonate pressure recovery well testing analysis in
actual oil fields at present, and there is only a partially simplified triple medium model
in commercial software.
In this project, the flow in the hole is regarded as the coupling of wave and flow; because
the radius of the hole is much larger than the radius of the wellbore, the energy
conservation is adopted when fluid flow from the hole to the wellbore; the hole in the
formation is treated as the source and sink, so that the well testing problem of carbonate
reservoir is simplified as "Well-hole", "Well-hole-hole" and "Well-hole-fracture-hole".
The research results and technical policies are suitable for the well testing analysis of the
whole carbonate fracture-hole reservoir, which has important guiding significance and high
popularizing value for understanding the fracture-hole structure and distribution of
carbonate fracture-hole reservoir, reasonable and effective productivity prediction, and
reforming low (no) effective well.
