Record of cement sealing length for well cementing in well 1-69 well in southeastern Hebei
CNPC news in January 24th learned that the well cementing in the Nanpu 1-69 well of Jidong Oilfield successfully completed the cement sealing cementing operation, and refreshed the 5129 meter cementing cement one-time sealing section record.
In Nanpu 1-69 well, the drilling depth is 5305 meters deep and the depth of the casing is 5170.4 meters deep, and the completion cementing cement returns to the wellhead at one time. The well has large displacement and high bottom hole temperature. There are many difficulties in cementing, such as borehole cleaning difficulty, easy blocking, large casing friction resistance, high downhole entry, large amount of cementing ash, easy leakage, high construction pressure and strict equipment requirements.
In order to ensure the cementing construction smoothly, the field actively seeking solutions through the use of large displacement circulation, backreaming drilling, heavy thick rock + narrow agent, adjusting drilling fluid dynamic plastic ratio, rotation cycle of drill and other ways to protect the borehole cleaning, avoid sand plugging caused by annular choke the occurrence of the computer; check into the load, naked eye into high performance lubrication closed pulp, using pneumatic chuck, fine operation of each link to guarantee the safe casing running.
The successful completion of well cementing in Nanpu 1-69 well has accumulated valuable construction experience for the fully sealed well cementing of the large inclined deep well in Jidong Oilfield.
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