Логин:
Пароль:
Регистрация
Забыли свой пароль?

Development of methods for assessing the oil productivity index of sidetrack wells (on the example of the Bobrikovskian deposit of Unvinskoye field)

UDK: 622.276.346
DOI: 10.24887/0028-2448-2019-5-82-84
Key words: oil production stimulation measures, oil productivity index, sidetracks, Student's t-test, stepwise linear discriminant analysis, terrigenous deposits
Authors: A.A. Shcherbakov (Perm National Research Polytechnic University, RF, Perm)

Many fields of the Solikamsk depression of the Perm region are characterized by the final stage of development and have a high oil recovery rate, close to the design, a high water content of the production, a deterioration of technical and economic indicators of production. To achieve the project indicators at the fields, various methods of enhanced oil recovery are used. The analysis of their application shows that the highest average increase in the initial oil production is achieved by sidetracking. When justifying the location of the lateral wellbore in the range of the productive formation, one of the main indicators of further well performance is the initial oil productivity index of the well.

The proposed method allows us to estimate the values of the oil productivity index for oil wells with a sidetrack based on the results of geophysical and hydrodynamic wells studies, values of reservoir properties, physical and chemical oil properties, as well as geological and technological indicators using mathematical statistics. At the first stage, correlation fields were constructed for all parameters of the initial data. Analysis of field data in combination with the values of the correlation coefficient showed the degree of influence of parameters on the oil productivity index. Then, for all values of the initial data using a step-by-step regression analysis, a multidimensional regression equation was obtained, in which the dependent variable was the oil productivity index, and the remaining parameters were independent. Next, a comparison was made between the actual and calculated by the equation model values of the productivity index in order to determine the uniform distribution of the obtained values. To determine the classes, the dependence of the oil productivity index on the zenith angle of the sidetrack in the interval of the reservoir О±, as the most statistically significant, was chosen. At the final stage, to predict the values of the oil productivity index, taking into account the selected classes, regression equations were obtained, which made it possible to increase the accuracy of the forecast of the oil productivity index.

References

1. Shcherbakov A.A., Turbakov M.S., Dvoretskas R.V., Effectiveness analysis of enhanced oil recovery methods implementation for hard-to-recover oil reserves of Perm Kama region (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 12, pp. 97–99.

2. Votinov A.S., Drozdov S.A., Malysheva V.L., Mordvinov V.A., Recovery and increase of the productivity of wells of Kashirskiy and Podolskiy reservoirs of the certain Perm region oil field (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 2, pp. 140–148, DOI: 10.15593/2224-9923/2018.4.4.

3. Shcherbakov A.A., Khizhnyak G.P., Galkin V.I., Effectiveness evaluation of oil production stimulation measures (on the example of the Solikamsk depression fields) (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2019, no. 2, pp. 70–73.

4. Varushkin S.V., Khakimova Zh.A., The design of geological exploration with side track drilling (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 1, pp. 16–27, DOI: 10.15593/2224-9923/2018.3.2.

5. Galkin V.I., Koshkin K.A., Melkishev O.A., The justification of zonal oil and gas potential of the territory of Visimskaya monocline by geochemical criteria (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 1, pp. 4–15, DOI: 10.15593/2224-9923/2018.3.1.

Many fields of the Solikamsk depression of the Perm region are characterized by the final stage of development and have a high oil recovery rate, close to the design, a high water content of the production, a deterioration of technical and economic indicators of production. To achieve the project indicators at the fields, various methods of enhanced oil recovery are used. The analysis of their application shows that the highest average increase in the initial oil production is achieved by sidetracking. When justifying the location of the lateral wellbore in the range of the productive formation, one of the main indicators of further well performance is the initial oil productivity index of the well.

The proposed method allows us to estimate the values of the oil productivity index for oil wells with a sidetrack based on the results of geophysical and hydrodynamic wells studies, values of reservoir properties, physical and chemical oil properties, as well as geological and technological indicators using mathematical statistics. At the first stage, correlation fields were constructed for all parameters of the initial data. Analysis of field data in combination with the values of the correlation coefficient showed the degree of influence of parameters on the oil productivity index. Then, for all values of the initial data using a step-by-step regression analysis, a multidimensional regression equation was obtained, in which the dependent variable was the oil productivity index, and the remaining parameters were independent. Next, a comparison was made between the actual and calculated by the equation model values of the productivity index in order to determine the uniform distribution of the obtained values. To determine the classes, the dependence of the oil productivity index on the zenith angle of the sidetrack in the interval of the reservoir О±, as the most statistically significant, was chosen. At the final stage, to predict the values of the oil productivity index, taking into account the selected classes, regression equations were obtained, which made it possible to increase the accuracy of the forecast of the oil productivity index.

References

1. Shcherbakov A.A., Turbakov M.S., Dvoretskas R.V., Effectiveness analysis of enhanced oil recovery methods implementation for hard-to-recover oil reserves of Perm Kama region (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 12, pp. 97–99.

2. Votinov A.S., Drozdov S.A., Malysheva V.L., Mordvinov V.A., Recovery and increase of the productivity of wells of Kashirskiy and Podolskiy reservoirs of the certain Perm region oil field (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 2, pp. 140–148, DOI: 10.15593/2224-9923/2018.4.4.

3. Shcherbakov A.A., Khizhnyak G.P., Galkin V.I., Effectiveness evaluation of oil production stimulation measures (on the example of the Solikamsk depression fields) (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2019, no. 2, pp. 70–73.

4. Varushkin S.V., Khakimova Zh.A., The design of geological exploration with side track drilling (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 1, pp. 16–27, DOI: 10.15593/2224-9923/2018.3.2.

5. Galkin V.I., Koshkin K.A., Melkishev O.A., The justification of zonal oil and gas potential of the territory of Visimskaya monocline by geochemical criteria (In Russ.), Vestnik Permskogo natsional'nogo issledovatel'skogo politekhnicheskogo universiteta. Geologiya. Neftegazovoe i gornoe delo = Perm Journal of Petroleum and Mining Engineering, 2018, V. 18, no. 1, pp. 4–15, DOI: 10.15593/2224-9923/2018.3.1.



Attention!
To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play

Press Releases

26.11.2019
13.11.2019
08.11.2019