Determination of lower sucker-rod breakage in wells equipped with sucker-rod pumps
| Autor: | G. I. Bikbulatova, Y A Boltneva, A. S. Galeev, S. L. Sabanov |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | IOP Conference Series: Materials Science and Engineering. 860:012029 |
| ISSN: | 1757-899X 1757-8981 |
| DOI: | 10.1088/1757-899x/860/1/012029 |
| Popis: | Development of mature oilfields of the Ural-Volga region is performed primarily by means of downhole sucker-rod pumping units (UShSN). The most characteristic failures of these installations are breakdowns and twist-offs and pump valve failures [1-5]. The ways of the elimination of these accidents vary significantly: rod breakage or twist-off implies pulling out of downhole equipment, and elimination of “sticking” of the pump’s shut-off valve assembly requires rehabilitation of downhole equipment through flushing with water, hot petroleum or a solvent. Failure to identify a malfunction leads to incorrect planning of wellbore equipment rehabilitation activities and, eventually, to economic losses.The cause of downhole equipment malfunctions is usually determined through analysis of dynamometer cards (DC). However, in the majority of cases, the dynamometer cards do not allow to distinguish the rods’ tail end twist-off from the rod pump valve failure. In the paper presented the method is considered for rapid detection of rod breakage and twist-offs (RBT) in the wellbore, which involves creation of an electrical circuit “rod string - tubing string” and monitoring of its integrity. To determine the failure type, the synchronization module measures the system’s resistance on the dielectric coupling via an electromagnetic conduit. In case of RBT, the electrical resistance of “tubing - pump - rod string” circuit will be much higher (over 2 Ohm) than in case of absence of this failure (0…2 Ohm). |
| Databáze: | OpenAIRE |
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