Measuring and testing – Borehole or drilling – Downhole test
Patent
1992-10-05
1994-06-21
Warden, Robert J.
Measuring and testing
Borehole or drilling
Downhole test
250254, 250262, 250266, 250267, 250270, 364422, 367 33, E21B 4500, G01V 100, G01V 500
Patent
active
053219821
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a device for measuring the true rate of penetration of an equipment progressing in a well. The invention can be applied in the petroleum field for determining the true rate of penetration of any well equipment, be it a drill bit or a measuring sonde for example. Knowing the true rate of penetration is of great importance for drillers, but also for geologists who need to know with precision the strata of the subsoil crossed through by a well.
2. Description of the Prior Art
Examples of the prior art in the field of determination of the measurement of the rate of penetration of a tool in a well are described in U.S. Pat. Nos. 2,688,871, 3,746,102 and 4,567,759, in European patent application EP-289,068 and in French patents 2,038,700 and 2,593,606, etc.
The rate of penetration of a tool in a well is often obtained indirectly through measurements performed at the surface. In the case of a drill bit, a standard method consists in measuring at the surface the rate of penetration into the ground of the string which supports the drill bit, as well as another parameter such as stress in the string or else, at the well bottom, the weight applied to the drill bit.
The results obtained with these type of methods are generally not very accurate. In fact, the string consists of more or less flexible drillpipes or tubes. It is therefore relatively elastic and the tension varies as a function of the length thereof. Consequently, corrections have to be introduced so as to take into account the length variations thereof, which are all the more considerable since the well is deep. The large friction between the string and the walls, as well as the influence of the different thrust loads exerted on the the equipment as a whole penetrating into the well should also be taken into account. Determining the rate of penetration therefore becomes very complex if all the factors which are likely to alter the values of the parameters introduced in the calculation are taken into account, insofar as they are known with precision.
Another method used with drilling operations consists of including in the equipment at the bottom of the hole several accelerometers for measuring the components of the acceleration of the equipment. The accelerations are integrated to obtain the rate of penetration according to the direction of the well. This method actually allows a direct measurement of the rate of penetration to be obtained. However, the implementing thereof is made difficult by the very large vibrations of the bit at the bottom of the hole, and also by the fact that the the signals provided by the accelerometers are subject to drift which if not compensated distorts the results.
SUMMARY OF THE INVENTION
Accordingly it is an object of the present invention to provide a method for measuring the true rate of displacement of an equipment in a well by avoiding the drawbacks mentioned above.
The method according to the invention thereto comprises the following steps :
the transmission of signals by transmitting means associated with the equipment;
the reception of the signals sent back by the wall of the, well by at least two receiving units associated with the equipment and disposed at different places along the well and at a determined distance from each other;
the storage of the signals respectively received by the two receiving units;
the recognition of the identical parts of the well wall which have sent back signals successively towards the two receiving units by comparing the stored signals received respectively by the two receiving units; and
the measurement of the time interval between passage of the two receiving units in front of each wall portion recognized through the comparison, the rate of displacement of the equipment depending on said measured time interval.
The method preferably comprises the explicit determination of the rate of displacement as a function of the measured time interval.
The method comprises for example stori
REFERENCES:
patent: 3302166 (1967-01-01), Zemanek, Jr.
patent: 4355378 (1982-10-01), Dennis et al.
patent: 4597067 (1986-06-01), Bockhorst et al.
patent: 4610005 (1986-09-01), Utasi
patent: 4662209 (1987-05-01), Brown
patent: 4675853 (1987-06-01), Bourgeouis et al.
patent: 4736297 (1988-04-01), Le Jeune
patent: 4901289 (1990-02-01), Cretin et al.
patent: 5206835 (1993-04-01), Beauducel
Clot Jean
Fay Hubert
Crawford L. M.
Institut Francais du Pe'trole
Warden Robert J.
LandOfFree
Method for measuring the rate of penetration of an equipment pro 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 for measuring the rate of penetration of an equipment pro, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for measuring the rate of penetration of an equipment pro will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2214666