Pipeline inspection gauge transfer assembly for oil and gas pipeline networks

UDK: 622.692
DOI: 10.24887/0028-2448-2020-10-99-101
Key words: T-joint, pipeline inspection gauge, pipeline inspection gauge launch/trap station, non-standard geometry T-joint, pipeline cleaning and inspection, pipeline inspection gauge transfer assembly
Authors: K.Ya. Ivanov (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), A.N. Glubokaia (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk), O.V. Zhuchkin (RN-KrasnoyarskNIPIneft LLC, RF, Krasnoyarsk)
During pipeline operation there is a tendency of internal contamination. Iron oxide, mechanical impurities and asphaltene sediments build up on pipe internal surface causing hydraulic pressure increment and cross-section reduction. In order to clean and inspect pipelines special device that is called pipeline inspection gauge is used. To launch and trap a pipeline inspection gauge special station need to be constructed. According to common rules, pipeline inspection gauge can be used only for unbranched pipeline sections having same diameter. Conventionally, pipeline from a well pad is connected to an oil-gathering line via T-joint. As a result of T-joint design, each well pad line is equipped with a trap station resulting in big number of stations nearby an oil-gathering point. Suggested in the article non-standard geometry T-joint allows to perform cleaning and inspection of pipelines with pipeline inspection gauge from 2 different well pad lines by means of joint branch bending. Use of the non-standard geometry T- joint reduces the number of units of technological equipment, required space; construction terms; CAPEX and OPEX. In addition, the suggested non-standard geometry T-joint with negligible modification can be used also for different diameter pipes. The modified joint allows to expand scope of application and consequently enforce economic impact.
During pipeline operation there is a tendency of internal contamination. Iron oxide, mechanical impurities and asphaltene sediments build up on pipe internal surface causing hydraulic pressure increment and cross-section reduction. In order to clean and inspect pipelines special device that is called pipeline inspection gauge is used. To launch and trap a pipeline inspection gauge special station need to be constructed. According to common rules, pipeline inspection gauge can be used only for unbranched pipeline sections having same diameter. Conventionally, pipeline from a well pad is connected to an oil-gathering line via T-joint. As a result of T-joint design, each well pad line is equipped with a trap station resulting in big number of stations nearby an oil-gathering point. Suggested in the article non-standard geometry T-joint allows to perform cleaning and inspection of pipelines with pipeline inspection gauge from 2 different well pad lines by means of joint branch bending. Use of the non-standard geometry T- joint reduces the number of units of technological equipment, required space; construction terms; CAPEX and OPEX. In addition, the suggested non-standard geometry T-joint with negligible modification can be used also for different diameter pipes. The modified joint allows to expand scope of application and consequently enforce economic impact.


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