Pay attention to the official account and find out the inadequacies of the cases.
After several pressure relief, Wang found that the pressure was stable at 7 MPa and did not rise again at 5 a.m.
There are no effective preventive measures for casing freezing during winter construction.
The cadre on duty arranged the fitter Wang to take charge of this work.
When the casing head is removed, the pressure is suddenly released, resulting in the collapse and flying of the cement head.
Cause analysis: （1） Direct cause During construction in winter, due to freezing and pressure holding in the casing, the pressure gauge cannot display the normal pressure value.
（2） Indirect cause 1.
After more than ten rounds, the cement head suddenly flew up and down to the small winch of the external Tong and flew along the body of the internal fitter Yang, The drill floor planking was smashed through a 10cm hole, causing no injury.
Freezing, pressure holding and flying out of cement head in winter construction In December of a year, a drilling crew completed running 3789m of 9-5 / 8 casing, and the cementing construction was normal.
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the next day.
5: 30 driller an led the crew to prepare to unload the cement head, cut the wellhead and install the well packer.
It was found that the pressure gauge of the cement head was frozen and thawed with steam.
After opening the pressure relief gate of the cement head, there was no mud leakage.
Several people used a crowbar to reverse the cement head shackle.
2.
According to the technical instruction, the pressure was held and waiting for setting, and the pressure did not exceed 10MPa.
The safety awareness of operators is not strong and the risk identification is not in place.
If the pressure exceeded 10MPa, the pressure should be relieved in time to the range of technical requirements.
