The process design: The numerical simulation of the composite
perforation in different cases is carried out to obtain the wellbore pressure and the
reagent combustion time to the peak pressure and the sustained action time of the pressure
(p-t curve), the safety condition and the fracturing condition of the wellbore are
determined, and the theoretical basis for the design of the perforation process is provided.
Steady-state capacity: The parameters such as perforation depth,
the perforation density, the perforation phase angle, the anisotropy of each phase of the
formation, the radius of the perforation hole, etc., are known, the productivity of the
actual oil and gas well is calculated, and the skin factor (the perforation skin, the
damaged skin, the total skin and so on) are given.
Transient production capacity: For dense oil and gas well, the
production capacity is unstable, and the production capacity curves at different time are
Bottom hole pressure: Under the condition of known flow, the
bottom hole pressure changes with time according to different geological conditions and
production mode is calculated.
Calculate the output: Given the bottom-hole flow pressure, the
change of the oil-gas well flow over time is calculated.
Perforation optimization: A certain perforating gun is given, and
the perforation optimization design is carried out, namely, oil/gas well productivity with
different perforation density, perforation phase angle and perforation format are calculated
under the condition that the perforation depth, the anisotropy of each phase of the
formation and the radius of the perforation hole are known, So as to select the best
economic benefit perforation scheme.
Sensitive analysis: The parameters such as the perforation depth
are known, and the curve of the flow over time under different pressures is calculated, and
the effect of different perforation parameters on the perforation production ratio
(sensitive parameter analysis) is also given.
Dynamic negative pressure perforation: Through the rapid
absorption of the residual detonation energy in the well bore, the pressure in the well bore
can be reduced instantly after the perforation, resulting in an instantaneous impact reflux,
the flushing of the perforation tunnel and the surrounding compact belt of the channel,
thereby releasing the compaction and improving the oil and gas well production.
Logging curve: The oil and gas section is determined according to
the logging curve, and the perforation is carried out, and the perforation section and the
logging curve are plotted on the same graph.