FIELD: oil and gas industry.
SUBSTANCE: external casing attachment method to casing pipes includes its one-sided attachment by locking members of blind bolt type by their screwing into threaded openings in cases of casing attachments. At that attachment is performed within limits of the arc from 90 up to 120 degrees. Working butt ends of the bolts are made flat, with hardness value less than hardness of the casing pipe material in order to prevent scouring. At the other end section of the bolt a shaped deepening is made for ex wrench. Quantity of bolts is selected from 2 up to 12 pieces depending on the string diameter. Casing attachment is made at one or several levels of the string. At that casing attachment by blots in the lower string part is made using a torque meter using force of at least 120 kN while in the upper string part with force of at least 40 kN.
EFFECT: improved reliability of casing attachment for the casing string.
5 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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RU2370632C1 |
