发明名称 |
COMPLETION OF DIRECT-CEMENTING CASING STRING WITH RETURN VALVE |
摘要 |
FIELD: oil and gas industry.SUBSTANCE: assembly of direct-cementing casing string with return valve is suggested, and this assembly comprises a common case for plug catching baffle with feed-through channel made to seal and fix a cementing plug, and return valve including bushing and saddle for the gate formed in the upper part of the bushing connected to the plug catching baffle. At that the return valve is made with the gate made as a ball and extendible saddle with elastic sealing. Moreover the upper part of the return valve bushing is fixed inside the feed-through channel of the plug catching baffle. Besides, the baffle is made with groves while cementing plug is equipped with a latch with scalloped surface to be inserted into the above grooves at setting the cementing plug into the plug catching baffle.EFFECT: improved reliability of the casing string closure upon completed circulation of grouting mortar both with cementing plug and return valve and fixation of gates from rotation for the purpose of in-line drilling of the assembly upon cementing.5 cl, 10 dwg |
申请公布号 |
RU2571469(C1) |
申请公布日期 |
2015.12.20 |
申请号 |
RU20140136672 |
申请日期 |
2014.09.09 |
申请人 |
OTKRYTOE AKTSIONERNOE OBSHCHESTVO "TJAZHPRESSMASH" |
发明人 |
VOLODIN ALEKSEJ MIKHAJLOVICH;SOROKIN VLADISLAV ALEKSEEVICH;PETROV NIKOLAJ PAVLOVICH;LOBODJUK SERGEJ BORISOVICH;KLINOV ANDREJ ALEKSANDROVICH;DEEV ALEKSANDR VIKTOROVICH;VASIN ALEKSEJ NIKOLAEVICH;ANDRIANOV OLEG NIKOLAEVICH |
分类号 |
E21B33/14 |
主分类号 |
E21B33/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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