Operation experience of differential pump for controlled directional and horizontal wells

Currently, in the field of oil production, horizontal and controlled directional wells, as well as sidetracks, are widely used since they provide a large area of contact between the producing reservoir and the wellbore. The operation of such wells by serial borehole sucker rod pumps is limited by the maximum allowable angle of inclination of the sucker rod pump. Also a complicating factor in the exploitation of oil fields, in particular the Ural- Volga region, is the presence of high-viscosity oils. The article presents the operational experience of the developed differential pump units for controlled directional and horizontal wells in complicated conditions, including at slope angles higher than permissible for serial pumps. The installation is certified, its serial production is mastered, it is introduced on 12 wells.
Results
During the period from 2011 to 2018, 12 differential pump for controlled directional and horizontal wells units were installed in the fund of extractive companies Sheshmaoil Management Company LLC: • on 6 oil wells in "Sheshmaoil" JSC; • on 2 oil wells in "Ideloil" JSC; • on 2 oil wells in " Geologiya " JSC; • on 1oil well in "Geotech" JSC; • on 1 oil well in "Kondurchaneft" JSC; As of the 2nd quarter of 2018 year there are 5 units of differential pump for controlled directional and horizontal wells in operation, which is 41.6%. Of the 12 wells equipped with the deployed sucker rod pump unit, the effect on additional oil production was obtained at 6 wells. During the pilot-field operation of the differential pump for controlled directional and horizontal wells unit, the total cumulative production at 12 wells was 10247.8 tons, the additional oil production was 1886.1 tons. The operation of the differential pump for controlled directional and horizontal wells at 7 out of 12 (58.3%) wells was carried out under the conditions of the zenith angle of the well (?) and the intensity of the set of curvature (i) at the pump installation site exceeding the maximum allowable values for serial sucker rod pumps. A certain experience has been accumulated in working with the differential pump for controlled directional and horizontal wells units, its maintenance, repair, etc.
Conclusions
1. Implementation in most cases (66.6%) was carried out at low-yield wells (with a daily production rate of less than 5 m3), after the introduction of the units in 50% of cases, the daily production rate of wells was increased; 2. The average viscosity of the extracted product is 158 mPa*s, which makes it possible to classify it as high-viscosity. The successful operation of the unit under such conditions is provided by the forced operation of the valve pairs and the presence of sufficient flow area in the pump design; 3. Statistics and experience of field operation of the sucker rod differential pump for controlled directional and horizontal wells allows us to speak about sufficient equipment reliability, high performance characteristics and its operability in oil production conditions up to high viscosity, when operating as conditionally vertical, controlled directional and horizontal wells. 4. The maximum operating pressure ND-NGS is 16 MPa, the viscosity of the recovered product is not more than 1000 mPa*s, gas content at the pump’s inlet is not more than 10%