| 摘要 |
FIELD: oil-and-gas production. ^ SUBSTANCE: invention relates to oil and gas industry and can be used for well casing, tie-back casing in main and secondary well shafts, wellhead sealing and linking tubing-casing annulus, for pumping process fluid or cement mortar through fitting a stop sleeve in an axial channel, at the level of working holes, and after axial displacement, at the level of circulating holes, mounting a support saddle at the top butt-end of the stop sleeve, the diametre of the support saddle of which is equal to the diametre of the tip of the cementing plug, making recesses on the bottom butt-end of the stop sleeve, which, after axial displacement of the stop sleeve, engage with stoppers, and fitting a stopper in the support saddle of the stop sleeve. ^ EFFECT: safe pumping of cement mortar into the annulus, without its penetration below the device, with prevention of contamination of the production horizon or filter, and separation of tubing-casing annulus. ^ 2 dwg |
