One of the primary causes of sucker rod pump failures is valve clogging with solid particles, asphalt, resin and paraffin deposits, floating debris, etc. To restore pump serviceability, some remedial actions are taken involving back flushing of downhole pumping equipment. However, back flushing is not always successful due to settling out of suspended solids in the pump and loss of flush fluid into the formation. The existing equipment is not suitable for direct flushing of valves, while the pumping equipment being in use allows for bottomhole treatment without workover crew only in wells equipped with insert pumps. The developed sucker rod pump design allows for direct flushing of standing and travelling valves, as well as bottomhole treatment with no involvement of workover crews. Employment of such equipment results in increased mean time before failure and reduced operating expenses for well servicing. Field trials involving use of sucker rod pumps suitable for direct flushing have been performed in six TATNEFT wells. Pumping unit serviceability has been checked in two operating regimes: process fluid injection through direct pump flushing and activating pump flow while checking valves for leaks. The article describes the sucker rod pump design and principle of its operation, as well as presents the results of field trials in six TATNEFT wells confirming its operational capability.
References
1. Patent RU 2715130 C1, Sucker-rod pump with possibility of direct flushing (Versions), Inventors: Garifov K.M., Kadyrov A.Kh., Glukhoded A.V., Balboshin V.A., Rakhmanov I.N., Siraev M.D.
2. Catalog: Izhevsk Oil Engineering Plant. Deep rod pumps, Izhevsk, 2009, 149 p., URL: http://www.tdneftemash.ru/files/gshn.pdf
3. Catalog: Backwash valve, URL: http://oilprom-synergy.ru/submersibleequipment/577-klapany-obratnye-s-funktsiej-pryamoj-promyvki-shok-p/415-klapanyobratnye-s-funktsiej-pryamoj-promyvki-shok-p
