Complex sticking treatment in logging transfer of Well H203H

WellH203 is a deep horizontal well and sticking happened in the process of logging transfer. It was very difficult to treat because of the co-existence of drilling pipe, electronic measuring instruments series and cable. The sticking should be unfrozen successfully and also the electronic measuring instruments, especially neutron source, must be lifted safely. After analyzing the formation lithology and make up of string, measures such as unfreezing agent soaking, freeze point measurement, drilling pipe substantial moving were conducted and unfortunately they all failed. It was found the main cause was the limit of drilling pipe movement because of the presence of cable bypass connector and matching joint. To overcome this, the acid soaking unfreezing was programmed and conducted successfully. It permitted a smooth follow-up and saved the drilling cost.