Changing the profile of directional wells for the further sidetracking

UDK: 622.24.085.2

DOI: 10.24887/0028-2448-2020-7-92-96

Key words: profile optimization, multi-lateral well, wellbore with complex path, dual comlition, sidetrack profile, design of borehole profile

Authors: A.V. Shcherbakov (Tyumen Industrial University, RF, Tyumen), E.G. Grechin (Tyumen Industrial University, RF, Tyumen), V.G. Kuznetsov (Tyumen Industrial University, RF, Tyumen)

Currently, a lot of major oil fields are in the latter stages of development, when the water-cut exceeds 90%. At the same time, the development of reserves of the edge zones and residual reserves by sidetraking with the preservation of the main hole, and dual completion require new approaches to planning the trajectory in the construction of wells. In this regard, quite a topical subject is the design of borehole trajectory with the possibility of the subsequent sidetracking with minimal values of the intensity of curvature of the spatial angle. Typically, the trajectories of the main and side boreholes are designed using various certified computer programs. However, the toolkit applicable in the programs is identical and depends on the coordinates of the targets; in advanced software products there are various tools to optimize the well profile, but only in case of one drilling target. The article presents the method of prompt calculation of the main parameters of a borehole profile at any location of the branch point of the sidetrack taking into account the requirements for the intensity of curvature and anti-aircraft angle. The methods of changing the profile of the sloping well with the aim of later drilling of the sidetrack reduce the risks of complications by significantly optimizing all parameters. The parameters of main borehole profile received by the proposed methods of determining the coordinates of the branch point are significantly different from the results of traditional method. In the result of parameters changing (anti-aircraft angle, curvature intensity, length of open trunk) the profile of the main hole becomes more complicated, because below the depth of the intended window clipping, it is necessary to change the azimuth. The use of the method of calculating the coordinates of the point of the sidetrack window clipping is also possible in the planning of exploratory and operational wells for additional fishing and geophysical research in the pilot holes. References 1. Abdullin A.V., Abdullin I.K., Barannikov Ya.I., Maksimov A.Yu., Use of layouts of dual production operation and dual injection operation, during sidetracks drilling without liquidation of the basic one (paternal) (In Russ.), Neftepromyslovoe delo, 2020, no. 3, pp. 41–44. 2. Bakirov D.L., Mazur G.V., Babushkin E.V. et al., Improving technology of horizontal sidetracking in complicated geological-technical conditions (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 8, pp. 40–43. 3. Budyanskiy V.S., Vlasov V.A., Krekin M.V. et al., Development of the technology of directional and horizontal drilling based on direct components arrangement (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2019, no. 6, pp. 5–8. 4. Shcherbakov A.V., Determination of place of additional wellbore drilling in a multilateral well (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2015, no. 10, pp. 18–23.