DD150096A1 - PACKER FOR COMPLETING A DRILLING HOLE - Google Patents

Abstract

The invention relates to a packer for closing a wellbore, preferably for injection work and for loss-of-loss control in wellbores. The aim of the invention is the simplification of the packer constructions and, associated therewith, the improvement of the application properties and the enlargement of the field of application. According to the invention, the object is achieved in that the packer consists of a packer shaft with the packer rubber pushed on, the ends of the packer rubber being vulcanized into the stud inlay. The axial displaceability of the packer rubber is limited by screwed onto the Packer shaft collars. At each end of the packer rubber to the pressure side, a seal is arranged, whereby a seal d. Packer rubbers against d. Packerschaft is achieved. D. Return d. pressure-relieved packer rubbers in its initial position on d. Packer shaft can be supported by built-in in the packer rubber spring elements.

Description

20380 -

Tita 1 of the invention;

Packer for closing a borehole

The invention relates to a packer for completing a wellbore, preferably for injection work and for mud loss control in wellbores.

Characteristics of the known teclinical _mii 2 solutions

Packers are known in which the packer rubber, which is sealingly connected to the borehole wall element, is connected by partly complicated parts to the packer shaft (DD-PS 105 648-UBE Packer from Atlas Copco).

These known packers have the disadvantage that the production of the fasteners for the Packerguinmi is relatively expensive and these fasteners also claim a relative amount of space in relation to the diameter in part. Another disadvantage is that the known packers are only suitable for relatively small diameter drill hole diameter ratios due to the solid Packergummieinspannung.

Object of the invention.

The aim of the invention is the simplification of the packer designs and, associated therewith, the improvement of the application properties and enlargement of the field of application.

Explanation of the essence of the invention

Dor invention is the object of providing an arrangement for the packer rubber on the Packerschaft ₉ through the

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The ratio of hole diameter to packer diameter is relatively groß.ist and their production cost is low · The object is achieved in that the packer rubber can be pushed onto the packer shaft. The liquid to be pumped flows through the packer shaft or through the annulus between the packer shaft and packer rubber. The axial displaceability of the packer rubber is limited by two collars screwed onto the packer shaft. The sealing of the packer rubber against the packer shaft is achieved in that a seal is arranged on the pressure side at each end of the packer rubber. The stability of the packer rubber ends under load is ensured by a vulcanized reinforcing insert and / or by layers of canvas. When hydraulically setting the packer rubber, especially with a large ratio of borehole diameter to the packer diameter, the two sealed ends of the packer rubber are mutually displaceable and thus allow a large expansion of the packer rubber without excessive specific loading of the rubber.

The return of the pressure-relieved packer rubber to its original position on the packer shaft can be assisted by one or more spring elements built into the packer rubber.

Embodiment 1

The invention will be explained in more detail below using an exemplary embodiment »

Figure 1 shows a sectional view of the packer «The packer consists of a Packerschaft 1, on which the Pakkergummi 3 is pushed. The axial position of the packer rubber. is fixed by two collars 2, which are screwed onto the packer shaft. To support the reverse deformation of the rubber after packer hydraulic relief in this · a compression spring 4 is built Zur- seal the pressure space between the packer and packer shaft rubber at each end of a lip seal 5 is arranged. The stability of the ends of the packer's rubber with the lip seals is ensured by vulcanizing reinforcing rings 6 and canvas layers. For use in the borehole, the packer shown is completed with a nozzle or a pressure relief valve.

Claims (2)

2 03 8 1 * Packer for completing a borehole, consisting of a Packerschaft, on which a packer rubber is pushed ', characterized in that the ends of Packergumiais, are vulcanized into the support inserts, upon expansion of the packer rubber against each other on the packer shaft freely' are displaced and that the packer rubber is sealed against the packer shaft by a seal installed in the packer rubber 2 »Packer for closing a borehole, characterized in that one or more spring elements are installed between the packer rubber and the packer shaft« For this 1 page drawings