Wells – Processes – Repairing object in well
Patent
1993-04-08
1994-06-07
Dang, Hoang C.
Wells
Processes
Repairing object in well
166 50, 166250, 166301, E21B 4700, E21B 3100
Patent
active
053181255
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for continuing measurements which have been interrupted or which have not started yet, when the measuring sonde is immobilized in a well into which it has been lowered at the end of a maneuvering and measure transmission cable.
BACKGROUND OF THE INVENTION
There are several well-known methods for trying to grapple a measuring sonde whose handling is no longer possible through the cable, but none allows measurements to be continued at the place where they have been stopped following the immobilization of the sonde or its sticking.
A first method is common to all operations for fishing tubular parts stuck or lost in a wellbore. The well is first cleared of the measuring cable so that it does not hinder later operations. To that effect, the cable is pulled until it breaks at the brittle point which is located on the fixing device on the upper part of the sonde. After taking up the cable by means of its winch, a fishing string mainly consisting of an "overshot", as it is commonly called in the profession, adapted to clutch the top of the sonde, is run down into the well. The other components are conventionally pipes and drill collars. In this method, the difficulty consists of covering the sonde with the overshot in the absence of guiding and while groping along from the surface. This operation may actually only succeed at a slight depth and in instances where the drill hole is well calibrated and where the axis of the tubular to be fished is almost parallel to the axis of the well. Concerning measuring sondes, most of them have a small diameter with respect to the hole and these conditions are scarcely present, except in small-diameter boreholes.
The most common method is called the "cut and thread" method. It consists of cutting the cable at the level of the derrick floor without dropping the part of the cable linked with the sonde into the well. Thus, the two ends of the cut cable are provided with two half-elements constituting a quick coupling. Assemblage of the overshot and of the first drill collars is started in the derrick. The end of the cable connected to the winch is passed through these first elements when they hang on the pipe hook. The two ends of the cable are connected through the quick coupling. The cable may then be maintained taut by its winch while the overshot and the first pipes are lowered around the latter into the well. After hanging them onto the rotary table, the cable is maintained before the quick coupling is opened so as to pass the end of the cable connected to the winch through new tubular elements assembled and hung on the pipe hook, as previously. The lowering maneuver is continued by repeating this operation until the overshot, guided by the coaxial cable, covers and clutches the top of the sonde. The fishing operation is ended, as in the previous method, after the cable has been broken.
This operation is long because passing the cable through each assembled length of tubular elements causes a waste of time which is relatively considerable in relation to the usual maneuver time. In case of sticking in a borehole, it is an accepted fact that speed is a preponderant factor for the success of the fishing operation.
None of the two methods described above allows measurements to be achieved or continued with the sonde in said well.
The method in accordance with the present invention reduces the maneuver time by limiting the number of operations for running the cable through the length of tubular elements, by using advantageously a side-entry sub.
With the "cut and thread method", the sonde is never connected electrically to the surface and it has never been attempted to keep the use of the sensors of the sonde once the latter is stuck. In fact, the use of a quick coupling including sealed connections for the conductors is of no interest here since the cable will be broken after the sonde has been clutched. Furthermore, the cable being coaxial to the string of tubular elements over its total length, it is not poss
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patent: 5180011 (1993-01-01), Wittrisch et al.
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Dang Hoang C.
Institut Francais du Pe'trole
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