Metal deforming – By pulling workpiece through closed periphery die – Producing a non-uniform product
Patent
1990-07-20
1992-06-09
Larson, Lowell A.
Metal deforming
By pulling workpiece through closed periphery die
Producing a non-uniform product
72278, B21C 104, B21C 308
Patent
active
051196611
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to working of metals by application of pressure, and more particularly it relates to a method of manufacturing profile pipes of the kind used in oil and gas well construction, and to an apparatus capable of performing this method.
The present invention can be employed to the utmost effect in the production of profile pipes used for patching off troublesome zones in well-drilling.
PRIOR ART
It frequently occurs in the drilling of deep wells that some of the exposed rock formations either intensely absorb the drilling mud or discharge their own formation fluid into the borehole. When such formations are being isolated by conventional cementing techniques, more often than not this fails to produce the desired results. The approaches used nowadays in such cases involve setting pre-reeled holder-type metal patchers, or else intermediate pipe strings--either complete (i.e. starting at the well head) or curtailed.
However, patchers have failed to find broad fields of application on account of their not ensuring adequate fluid-tightness in isolating a troublesome zone; besides, they cannot be made of relatively great lengths, so that they are not suitable for high-effect isolation of troublesome zones whose extent is several tens or even hundreds of meters.
When intermediate pipe strings, whether complete or curtailed, are used for the purpose, the troublesome zones are reliably patched off. However, the operations involved incur considerable costs of cementing such strings in the well and of the excessive input of the metal, cement and time. Furthermore, with every new intermediate string installed in the well, the well diameter becomes smaller, which adversely affects the production conditions.
There is known a method of manufacturing profile pipes including the operation of profiling the central portion of a cylindrical pipe by drawing it through a moulding device (SU, A, 549196).
The apparatus capable of performing this method comprises a drawing die including a sleeve with a shaped die made of split shaping elements mounted on resilient rods interconnected by a ring, and a unit for applying an external load to the shaped die. The resilient members are interconnected at a distance from the end face of the die, which is not shorter than two lengths of the shaping elements of the die.
A major drawback of the abovedescribed known method and of the apparatus for performing this method is that profile pipes thus produced would not be run into a well and set in a troublesome zone with tight engagement with the borehole wall, because this requires that the pipe stock (blank) prior to its profiling should have an outer diameter equalling the borehole or well diameter in the troublesome zone.
However, when pipes are profiled in accordance with the above method of the prior art, the pipe has its diameter reduced only over its central shaped portion, the cylindrical ends of the pipe retaining the initial diameter and, hence, would not be run into a well. If the diameter of the pipe is reduced still further, the pipe would not be properly set in a troublesome zone in a well, as its wall would fail to engage the borehole wall. The above drawback becomes even more marked when the patching-off of troublesome zones is conducted with expanding the diameter of the borehole in the troublesome zone beyond the well diameter, so as not to reduce the flow passage of the well.
Another shortcoming of the known method and apparatus for performing it is the process of producing a profile pipe with two cylindrical ends being performed in a succession of steps, which both complicates the manufacture of such pipes and makes them costly, to say nothing of the adversely affected productivity.
There is further known a method of manufacturing profile pipes by drawing them through a moulding device (A. K. Shurupov, M. A. Freiberg, "Proizvodstvo truboekenomichnykh profiley" /Production of Economical Profile Pipes/, Gosudarstvennoye nauchno-teknicheskoye izdatel'stvo po chernoi i tsvetnoi metallur
REFERENCES:
patent: 541053 (1895-06-01), Peirce
patent: 3487673 (1970-01-01), House
patent: 4079616 (1978-03-01), Zazimko et al.
patent: 4879892 (1989-11-01), Paraskevas
A. K. Shurupov, M. A. Freiberg, "Proizvodstvo truboekenomichnykh profiley"/Production of Economical Profile Pipes/, Gosudarstvennoye nauchbno-tekinicheskoye izdatel'stvo po chernoi i tsvetno metallurgill/Sverdlovsk/, p. 146.
Abdrakhmanov Gabdrashit S.
Aleshin Vladimir A.
Bulgakov Rishad T.
Duev Veniamin N.
Fotov Alexandr A.
Larson Lowell A.
Schoeffler Thomas C.
LandOfFree
Apparatus for manufacturing profile pipes used in well construct does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for manufacturing profile pipes used in well construct, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for manufacturing profile pipes used in well construct will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1796475