METHODS OF PRESSURE TESTING OF TUBING STRING IN WELL, MANUFACTURING OF SHUT-OFF PRESSURE TESTING DEVICE AND DEVICE FOR IMPLEMENTATION OF METHODS Russian patent published in 2019 - IPC E21B34/10 E21B17/00 F16K17/40 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil and gas industry and can be used for pressure testing of tubing string in wells equipped with production string. Method for crimping of tubing string run in production string consists in lowering pipes with saddle to the well and, then, of shutoff element into pipe string before boarding, tightly closing its passage. Pressure testing and removal of the shut-off element from the seat is performed with full opening of its passage. According to the invention, the shut-off element is broken down at pressure higher than pressure above 20–30 %. Final dissolution of the shut-off element parts takes place at the bottomhole. Method of manufacturing of soluble shut-off element from cement of different grades and table salt in proportion from 2:3 to 1:4. Device for pressure testing of a tubing string includes a crimp coupling connected to the lower part of the string, a shutoff element and a sealing element. Shutoff element is made of material to be destroyed under action of fixed pressure in pipe string and soluble in borehole environment.

EFFECT: technical result consists in reduction of duration of pressure test.

4 cl, 10 dwg