Development and application of specific multifunctional ground flow transformation apparatus

As the sand control operation well head has no function of flow transformation, the time used for gravel fill and circulation well washing is quite long, and circulation channel may be blocked by sand easily. In order to solve those problems, specific multifunctional ground flow transformation apparatus are developed. The apparatus are composed of well head sliding system, positive and negative circulation system and regulation system. Depending on strength calculation and prototype test of the major components, the experiment result proved that the device can realize convenient surface pipeline flow conversion, Due to the slip sealing section of the apparatus, the well head operation can be performed as usual while raising and lowering strings. The apparatus have been used in Shengli Oilfield for nearly a hundred times, which are all one-time success. This technology shows the good performance and a broad application prospect.