Optimization of the technological mode of rod unit with combined fiberglass rod string

UDK: 622.276.53
DOI: 10.24887/0028-2448-2021-1-57-61
Key words: sucker-rod pumping unit, fiberglass sucker rods, the depth of descent of the pump dynamometer card, given the stress, modeling
Authors: E.O. Timashev (Ufa State Petroleum Technological University, RF, Ufa), K.R. Urazakov (Ufa State Petroleum Technological University, RF, Ufa; RN-BashNIPIneft LLC, RF, Ufa), A.V. Lushnikov (Udmurtneft JSC, RF, Izhevsk), D.K. Evdokimov (Udmurtneft JSC, RF, Izhevsk)

Composite rods made of fiberglass are a promising way to increase the efficiency of well operation by rod installations, which are characterized by significantly lower weight, higher strength and corrosion resistance compared to steel rods. Due to the difference in the physical properties of the material of steel and fiberglass pumping rods, the calculation of the optimal operating mode of rod installations requires individual design of the process mode parameters for each specific well.

Experimental field tests were performed to optimize the technological mode of rod installations with a combined fiberglass rod column on the basis of multivariate calculations based on the developed mathematical model of a rod installation with a combined fiberglass rod column. Verification of the developed method for calculating the parameters of the technological mode based on the mathematical model of the rod installation showed a good agreement between the calculated and actual indicators. Based on the results of the field tests, additional liquid and oil production was obtained from the tested wells by increasing the depth of the pump descent and pumping speed. It is shown that the increase in the depth of the pump descent when optimizing the mode is mainly carried out by increasing the length of the fiberglass stage, so there is no significant increase in the load on the rod column. Due to the increased extensibility of fiberglass rods, which cause loss of plunger stroke, wells are optimized to switch to a smaller pump plunger diameter, which simultaneously reduces the maximum load on the rods and the drive. The results obtained are recommended to be taken into account when designing the technological mode of rod installations equipped with fiberglass rods.

References

1. Takacs G., Sucker-rod pumping handbook, Elsevier Science Publ., 2015, 598 p.

2. Timashev E.O., Khalfin R.S., Volkov M.G., Statistical analysis of the failure times and feed rates of downhole pumping equipment in operating parameter ranges (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 2, pp. 96–100.

3. Bakhtizin R.N., Rizvanov R.R., Urazakov K.R., Khakimov T.A., Nasosnye shtangi (Sucker Rods), Ufa: Neftegazovoe delo Publ., 2012, 80 p.

4. Alievskiy P.A., Arutyunov I.A., Bikchentaev R.M. et al., Pumping rods from fiberglass plastic (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 12, pp. 62–66. 

5. Zuo Y., Wu X., A comparative study of four rod load reduction techniques for deep-rod pumping, Journal of Petroleum Exploration and Production Technology, 2018, no. 8, pp. 475–483.

6. Ruidong Zhao, Yi Peng, Qiming Li et al., Deep well lifting new solution in Tarim oilfield, SPE-192494-MS, 2018. 

7. Ruidong Zhao, Xishun Zhang, Zhen Tao et al., The research and application of carbon fiber rods in deep oil wells of Xinjiang oilfield, China, SPE-184203-MS, 2016.

8. Gibbs S.G., Application of fiberglass sucker rods, SPE-20151-PA, 1991, https://doi.org/10.2118/20151-PA

9. Cen Xueqi, Wu Xiaodong, Gaofei et al., Optimization of fiber glass and steel composite rod design, Oil Field Equipment, 2012, V. 41(5), pp. 31–35.

10. Bakhtizin R.N., Urazakov K.R., Ismagilov S.F. et al., Dynamic model of a rod pump installation for inclined wells, Socar Proceedings, 2017, no. 4, pp. 74–82.

11. Bakhtizin R.N., Urazakov K.R., Timashev E.O., Belov A.E., A new approach of quantifying the technical condition of rod units with the solution of inverse dynamic problems by multidimensional optimization methods (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 7, pp. 118–122, DOI: 10.24887/0028-2448-2019-7-118-122

12. Urazakov K.R., Timashev E.O., Tugunov P.M., Davletshin F.F., Study on efficiency of rod unit with combined fiberglass rod string (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 7, pp. 123-127, DOI: 10.24887/0028-2448-2019-7-123–127.

Composite rods made of fiberglass are a promising way to increase the efficiency of well operation by rod installations, which are characterized by significantly lower weight, higher strength and corrosion resistance compared to steel rods. Due to the difference in the physical properties of the material of steel and fiberglass pumping rods, the calculation of the optimal operating mode of rod installations requires individual design of the process mode parameters for each specific well.

Experimental field tests were performed to optimize the technological mode of rod installations with a combined fiberglass rod column on the basis of multivariate calculations based on the developed mathematical model of a rod installation with a combined fiberglass rod column. Verification of the developed method for calculating the parameters of the technological mode based on the mathematical model of the rod installation showed a good agreement between the calculated and actual indicators. Based on the results of the field tests, additional liquid and oil production was obtained from the tested wells by increasing the depth of the pump descent and pumping speed. It is shown that the increase in the depth of the pump descent when optimizing the mode is mainly carried out by increasing the length of the fiberglass stage, so there is no significant increase in the load on the rod column. Due to the increased extensibility of fiberglass rods, which cause loss of plunger stroke, wells are optimized to switch to a smaller pump plunger diameter, which simultaneously reduces the maximum load on the rods and the drive. The results obtained are recommended to be taken into account when designing the technological mode of rod installations equipped with fiberglass rods.

References

1. Takacs G., Sucker-rod pumping handbook, Elsevier Science Publ., 2015, 598 p.

2. Timashev E.O., Khalfin R.S., Volkov M.G., Statistical analysis of the failure times and feed rates of downhole pumping equipment in operating parameter ranges (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2020, no. 2, pp. 96–100.

3. Bakhtizin R.N., Rizvanov R.R., Urazakov K.R., Khakimov T.A., Nasosnye shtangi (Sucker Rods), Ufa: Neftegazovoe delo Publ., 2012, 80 p.

4. Alievskiy P.A., Arutyunov I.A., Bikchentaev R.M. et al., Pumping rods from fiberglass plastic (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2003, no. 12, pp. 62–66. 

5. Zuo Y., Wu X., A comparative study of four rod load reduction techniques for deep-rod pumping, Journal of Petroleum Exploration and Production Technology, 2018, no. 8, pp. 475–483.

6. Ruidong Zhao, Yi Peng, Qiming Li et al., Deep well lifting new solution in Tarim oilfield, SPE-192494-MS, 2018. 

7. Ruidong Zhao, Xishun Zhang, Zhen Tao et al., The research and application of carbon fiber rods in deep oil wells of Xinjiang oilfield, China, SPE-184203-MS, 2016.

8. Gibbs S.G., Application of fiberglass sucker rods, SPE-20151-PA, 1991, https://doi.org/10.2118/20151-PA

9. Cen Xueqi, Wu Xiaodong, Gaofei et al., Optimization of fiber glass and steel composite rod design, Oil Field Equipment, 2012, V. 41(5), pp. 31–35.

10. Bakhtizin R.N., Urazakov K.R., Ismagilov S.F. et al., Dynamic model of a rod pump installation for inclined wells, Socar Proceedings, 2017, no. 4, pp. 74–82.

11. Bakhtizin R.N., Urazakov K.R., Timashev E.O., Belov A.E., A new approach of quantifying the technical condition of rod units with the solution of inverse dynamic problems by multidimensional optimization methods (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 7, pp. 118–122, DOI: 10.24887/0028-2448-2019-7-118-122

12. Urazakov K.R., Timashev E.O., Tugunov P.M., Davletshin F.F., Study on efficiency of rod unit with combined fiberglass rod string (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 7, pp. 123-127, DOI: 10.24887/0028-2448-2019-7-123–127.


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