One very important type in modern well control processes is the choke manifold. In the construction of the well, due to improper operation or other reasons, the air pressure in the wellbore often rises out of control after the well is shut down, and it accumulates to a certain extent and rushes to the wellhead, making the air pressure at the wellhead rise. If you want to discharge these excessive gases, you must use the choke valve to regulate the pressure so that it can maintain balance, and this is the function of the choke manifold.
1. Current situation analysis
The common choke manifold has met the requirements of modern well control technology, but there are still many problems in the actual use. Due to various reasons, the choke valve spool is very easy to fall off. From the well control procedure, it is not difficult to find that the valve is frequently used in the process of shutting in and opening the well. The valve spool is an important part of the valve, once it falls off, the choke manifold will not play a role. When the air pressure in the well reaches dangerous condition, it is easy to cause well control danger if the air pressure cannot be controlled and balanced by the valve in time. Therefore, the valve spool falling off is a problem that managers must pay attention to and requires regular maintenance.
The stem and barrel spool used today usually need to use cross nuts, nuts and stem threads when fixing them. By studying the process of choke manifold operation, two common problems can be found. In general, the liquid from in to out will form a force in the direction of the fixed nut, acting on the nut, so that there is a radial force on the nut, thus impacting the nut and making it fall off. In this way, if the spool is not fixed by other external objects, it will fall off. The following will produce two situations, one is the valve impassability, which is in the case of the spool blocking the seat first, and the second is the formation of a fixed valve, which is in the case of the nut this part first washed away, although the spool also rushed to the seat, but at this time the inner hole is unblocked, and there is no blockage.
2. Other problems with the choke manifold
The current pipe is backward in the welding method, and the anti-sulfur treatment that should be carried out is not applied, including the anti-vulcanization treatment that is not carried out on other connection routes. When these lines come into contact with sulfur-containing fluids, a chemical reaction occurs, which then corrodes and produces hydrogen embrittlement leaks. In addition, when connecting the pipeline, all of them are hardwired, and the disadvantage of this way is that the length of the line cannot be adjusted.
In addition, if there is a large error between the end distance between the gate valves, then the probability of gasket seal problems will increase. Therefore, in order to reduce the error, it is necessary to increase the steps to check the seal. If it is to replace the manifold as a whole, taking into account the reality of the error between the manifold, coupled with pipeline fixing and other factors, the progress of the overall replacement has to be suspended.
Finally, the choke position transmitter may also have problems, leading to problems such as position adjustment failure. The reason is that the transmitter installation position is very special, it is located behind the throttle valve, although in the perspective of the protection of the instrument, the designer has used the box to protect the transmitter in advance, but the body itself is not sealed, and the chemical substances in the drilling may enter the box, thus corroding the transmitter, so that it cannot play its due function.
Choke manifolds manufactured by Vigor strictly abide by API 16 C standard. As the most professional team in the oil and gad industry, Vigor always adheres to the principle of safe delivery of high-quality products to our customers. Through our unremitting efforts, we have also received good feedback from many customers. Our team always believe that good products will receive good reviews. After you order the product, we will serve you all the way, so that you do not have to worry about any link before the delivery of the goods. If you are interested in our products, please do not hesitate to let us know.
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