At present, high-strength pipes with double-shoulder tool joints are used for well drilling, which can be operated for years. When drillpipes reach a designed working life they are either replaced or repaired. Cost of repair is made up of two main elements: the cost of repair itself and the cost of transporting pipes from the field to the repair facility and back. About 4,000 drillpipes a year need repairing in RN-Uvatneftegas. In order to minimize the cost of transporting pipes from remote fields a mobile lathe unit has been introduced in the company. The mobile unit includes a number of facilities which house a non-destructive testing laboratory for drillpipe inspection, a digital lathe, a spray-type device for covering treaded joints with phosphate, a unit for breaking-in lathed joints, a unit for applying surface hardening on joints' outer surface and other necessary equipment. The unit's installation and adjustment take 7-10 days, and then it allows to repair drillpipes on a round-the-clock basis in all weather conditions. The use of the mobile unit has enabled RN-Uvatneftegaz to reduce the cost of drillpipes repair by 30%. It has also enabled to minimize the risk of work disruption associated with the need to transport drillpipes outside of the fields.
References
1. Bulatov A.I., Proselkov Yu.M., Shamanov S.A., Tekhnika i tekhnologiya bureniya neftyanykh i gazovykh skvazhin (Technique and technology of oil and gas wells drilling), Moscow: Nedra-Biznestsentr Publ., 2003, 1007 p.
2. Truby buril'nye. Rukovodstvo po ekspluatatsii (Drill pipes. Manual), Moscow: Publ. of NII Razrabotki i ekspluatatsii neftepromyslovykh trub, 2019, 241 p.
3. URL: http://delta-energy.ru/services/mtk/
