THREADED CONNECTION OF PIPES (VERSIONS), CONNECTED PIPE AND ADAPTER Russian patent published in 2020 - IPC F16L15/00 

FIELD: drilling of wells.

SUBSTANCE: invention relates to devices for drilling wells for oil and gas production, in particular, to universal connections of drilling pipes to a string. Threaded connection of pipes consists of coupling and nipple parts connected by thread, at that threaded surfaces of parts are equally strong due to that on threaded surfaces there is hardening with passes, note here that hardened surface hardness makes from 380 to 620 Brinell hardness. Another version of threaded connection is described. Described is a connecting pipe as an element of a threaded joint, comprising a pipe body, at least one coupling or nipple attached end, on which there is a thread, and on the threaded surface and on the pipe end face there is hardening with passes, and hardness of the surface hardened layer is from 380 to 620 Brinell hardness. Adapter as element of threaded connection represents a branch pipe, on ends of which there is external or internal thread, wherein surface of thread is hardened, note here that reinforcing is performed on thrust ends of reducer. Note here that hardness of surface hardened layer of threaded surfaces and thrust faces of reducer makes 380–620 Brinell hardness.

EFFECT: technical result consists in hardening of threaded surfaces of connection.

4 cl, 6 dwg