Device for cutting slot-shaped seats in wells by hydro-sandblasting method

Abstract

This device relates to the fields of mining, specifically oil and gas industry, hydro-geological, geological engineering and water supply industries and is intended for cutting slot-shaped seats in well side zones of producing formation by hydro-abrasive blast. The determined task is solved by introducing essential changes into the known device for construction of cutting slot-shaped seats from the well wall inside the rock consisting of the hydro-abrasive jet generator connected with the perforator through the pump-and-compressor tubing string; the perforator is put into the casing pipe and has two diametrical nozzles which are directed at the well wall; there is a ball valve at the perforator end, as well as devices for adjustable partial unloading of PCS, PCS weight measuring device, abrasive jet pressure measuring device and the sealer for sealing of wellhead. The changes are as follows:—The perforator is directly connected with PCS;—A pin mounted under the perforator with possible axial movements is introduced;—A cylindrical retainer washer is put on the upper part of the perforator above nozzles; the washer is fixed so as to permit axial movement;—PCS indexing mechanism, step rings and a tripping muff are mounted bottom up and in alignment on the lower tube of PCS which is in series connected with the perforator;—At the same time the pin is connected with the cylindrical washer situated on the upper part of the perforator by control-rods with possible axial movement;—The indexing mechanism is put on PCS with the possibility of fixed coupling of its body with the casing pipe wall and split engagement of its body by step rings. Step rings are to be rigidly fixed on the lower PCS tube, and the tripping muff-on the PPS with its skirt down. At least a couple of rotary fluke-claws, with one end of each hingedly connected with the body of indexing mechanism, and the other end clasped to the casing pipe wall by spacer springs mounted between the indexing mechanism body and the fluke-flaw end, can be a variant of engagement of the indexing mechanism body with the casing pipe wall. At least a couple of spring-mounted pins installed on the interior surface of the indexing device body can be a variant of split engagement of the indexing mechanism by step rings. At that the pin heads are of round shape at the contacting end set against PCS. A muff with conical inside surface and the exterior of streamlined form can be a variant of tripping muff for forced tripping of the indexing mechanism from the casing pipe wall. The optimum distance between the step rings equals to one drain port diameter D±5%, and the number of rings has to amount to prescribed length of the slot-shaped seat divided by the drain port diameter D. At the same time adjacent drainage canals will unite and form a single slot-shaped seat. The recommended force for coupling of the split pin heads with PCS lies within the limits of 10-20% of PCS weight. The recommended force for coupling of the indexing device body with the casing pipe wall is in the range from 30% of PCS weight up to breaking strength point of the casing pipe.

1 . A device for construction of slot-shaped seats from the well wall inside the rock consisting of a hydro-abrasive jet generator which is connected with a perforator through tubing string; the perforator is put into casing pipe and has two diametrical nozzles which are directed at the well wall; there is a ball valve at the perforator end,
 as well a device for adjustable partial unloading of PCS, PCS weight measuring device, abrasive jet pressure measuring device and a sealer for the wellhead sealing;   the distinction lies in the fact that:   The perforator is directly connected with PCS; a pin is mounted into the opening on the lower end of the perforator with possible axial movements; a cylindrical retainer washer is put on the upper part of the perforator above nozzles; the washer is connected with the pin by control-rods; on the lower tube of PCS which is connected with the perforator, the PCS indexing mechanism, step rings and a tripping muff are bottom up mounted in series and in alignment. The indexing mechanism is put on PCS with the possibility of fixed coupling of its body with the casing pipe wall and split engagement of its body by step rings, which are rigidly fixed on the lower PCS tube, and the tripping muff—on PCS with the skirt down.;   
   
   
       2 . Device as in  claim 1 , the distinction lies in the fact that the indexing mechanism body is engaged with the casing pipe wall in the form of at least a couple of rotary fluke-claws, with one end of each hingedly connected with the body of indexing mechanism, and the other end is clasped to the casing pipe wall by spacer springs mounted between the indexing mechanism body and the fluke-flaw. 
   
   
       3 . Device as in  claim 1 , the distinction lies in the fact that the indexing mechanism's split engagement by step rings is in the form of at least a couple of spring-mounted pins installed on the interior surface of the indexing device body; with pin heads of round shape at the contacting end set against PCS. 
   
   
       4 . Device as in  claim 3 , the distinction lies in the fact that the force for coupling of the indexing device with the casing pipe wall is chosen in the range from 30% of PCS weight up to breaking strength point of the casing pipe. 
   
   
       5 . Device as in  claim 3 , the distinction lies in the fact that the force for coupling of the split pin heads with PCS is chosen within the limits of 10-20% of PCS weight. 
   
   
       6 . Device as in  claim 1 , the distinction lies in the fact that the distance between the step rings is equal to the drain port diameter D±5%, and the number of rings amounts to the productive formation thickness divided by drain port diameter D. 
   
   
       7 . Device as in  claim 1 , the distinction lies in the fact that the tripping muff has a conical inside surface and the exterior of streamlined form.