Easy to open indicating cement head

Abstract

The invention relates to the technical field of cementing heads, in particular to an easy-opening cementing head with an indication function. The cementing head comprises a cementing head body, a gland, a substitute inlet joint, a cement slurry inlet joint, a rotary stop pin, a stop pin control valve assembly and an indication device. An injection passage is formed inside the cementing head body; the gland capable of blocking the injection passage is fixedly mounted at the upper end of the cementing head body hermetically; the substitute inlet joint communicated with the injection passage is arranged on the upper portion of the cementing head body. The cementing head which is of reasonable and compact structure is convenient to use. The rotary stop pin can be turned on and reset rapidly while falling conditions of a rubber plug can be checked through a falling reset indicating pointer; thus operation is facilitated and both time and labor are saved and precision is high. After being turned on, the rotary stop pin is disposed in a lower accommodating cavity, so that the rubber plug can fall smoothly, scratches caused by failure of turning-on are avoided, and safety and reliability are guaranteed. In addition, accidents of construction safety and cementing quality are reduced effectively so that safety and convenience are improved further.

Description

technical field [0001] The invention relates to the technical field of cement heads, and relates to a conveniently openable indicating cement head. Background technique [0002] The cement head is an indispensable wellhead tool in the cementing construction, and plays a very important role in the cementing process. At present, the commonly used cement heads at home and abroad all adopt the screw-rotating stop pin structure. It takes 10-13 turns to open the stop pin during cementing construction. The operation is time-consuming, and the following phenomena are prone to occur: The plug cannot go down normally; when the stop pin is not opened in place, the rubber plug goes down at the same time due to the pressure difference, causing the rubber plug sealing ring to be damaged; it is impossible to judge whether the rubber plug is falling normally, or the downward indicating device is easy to fail, and it is impossible to correctly judge the rubber plug In addition, the inner di...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a convenient opening indicating cement head, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the stop pin of the screw rotating cement head cannot be opened. In place, the sealing ring of the rubber plug is easy to be damaged, the downward indicating device is easy to fail, and the stop pin is difficult to open

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