Method of determining position and dimensions of a subsurface st

Details Method of determining position and dimensions of a subsurface st Method of determining position and dimensions of a subsurface st

1990-04-04

1993-04-27

Swann, Tod R.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181105, 73 405R, 73155, G01V 140

Patent

active

052068366

ABSTRACT:
The growth of a hydraulic fracture increases the period of free oscillations in the well connected to the fracture. Simultaneously, the decay rate of free oscillations decreases. The properties of forced oscillations in a well also change during fracture growth. All of these effects result from the changing impedance of the hydraulic fracture that intersects the well. Hydraulic fracture impedance can be defined in terms of the hydraulic resistance and the hydraulic capacitance of a fracture. Fracture impedance can be determined directly by measuring the ratio of down hole pressure and flow oscillations or indirectly from well head impedance measurements using impedance transfer functions. Well head pressure measurements can also be used to evaluate fracture impedance by comparing them to pressure oscillations computed with hydraulic models that include fractures with different impedances. Because impedance is a function of fracture dimensions and the elasticity of the surrounding rock, impedance analysis can be used to evaluate the geometry of the fracture by analyzing the data which results from free and forced oscillations in the well, and looking for a match between the data and theoretical models of projected shapes of the fracture.

REFERENCES:
patent: 4372380 (1980-02-01), Smith et al.
patent: 4393933 (1983-07-01), Nolte et al.
patent: 4458245 (1984-07-01), Crosnier et al.
patent: 4779200 (1988-10-01), Bradbury et al.
patent: 4783769 (1988-11-01), Holzhausen et al.
G. R. Holzhausen et al; "Impedance of Hydraulic Fractures"; SPE/DOE 13892 May 19-22, 1985 Conference pp. 411-422.
G. R. Holzhausen et al., "Fracture Diagnostics in E. Texas & W. Colorado Using Hydraulic-Impedance"; May 18, 1986 Conference pp. 97-109 SPE 15215.

Affiliated with

Also associated with

Rating

Method of determining position and dimensions of a subsurface st does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of determining position and dimensions of a subsurface st, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of determining position and dimensions of a subsurface st will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2333187