He First Large-diameter Pig Ball-passing Operation On Land in China Was Successfully Completed

The Yongqian 3 well group platform is located in the Jianyang block of the Tianfu gas field. The platform has a total of 11 pilot test wells deployed. The produced gas is processed by 3 sets of integrated dehydration and dehydrogenation skids and then transported to the large pipeline network. Among them, there are 3.56 kilometers of DN200 pipelines and 26.5 kilometers of DN300 pipelines. Faced with difficulties such as small diameter, low flow, large span diameter change, many elbows, and large mountain elevation difference, this pipeline cleaning operation was decided to use a variable diameter pig ball after multiple preliminary investigations, creating a precedent for small diameter and large variable diameter pipeline cleaning operations on land in China.

Clear pipe before the operation, Northwest Sichuan gas mine carefully organized, fine arrangements, combined with the station process and operational needs, prepared in advance, "Yong Shallow 3 wells platform to the high dragon clearing station pipeline reducer pipe cleaner clearing operations program", the site organization held a thematic analysis will be carefully analyzed and identify risks, the implementation of control measures and increase a number of sets of response to the disposal of the program. Clear pipe process, the company's relevant departments and gas mine leaders forward command, the local unit Qionglai gas extraction operation area carefully deployed, solid advancement, optimize the process switching, venting, nitrogen replacement, clearing operations and boosting, open wells to resume production and other work, combined with the operating parameters in the course of the operation, many times to adjust the gas source, venting and other data, to overcome the high temperature weather, and continued to fight for 36 hours, safely and efficiently and successfully completed the two successive This time, the pipeline cleaning operation successfully removed the inner part of the pipeline.

The pipe cleaning operation successfully removed the internal impurities of the pipeline, achieved the expected effect, accumulated experience in pipe cleaning operation of small diameter and large variable diameter pipeline, ensured the safe and smooth operation of the pipeline, and laid a solid foundation for the further improvement of the production capacity of Yongshaoshan 3 well group platform in the next step.