Impact of geomechanics on sidetracking candidate selection

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1 SPE Workshop OILFIELD GEOMECHANICS Slide 1 Impact of geomechanics on sidetracking candidate selection Author: Bazyrov Ildar Co-authors: Khalikov R.K., Chebyshev I.S., Martemyanov A.N., Kalinin O.U. JSC «Gazpromneft STC» March 27-28, 2017 Moscow, Russia

2 Goal and tasks. Slide 2 Goal: To range the wells for the further detailed analysis. Tasks: To analyze the statistics of the stock of active sidetracking wells; To develop a new algorithm for the selection of candidates for the operation of the sidetracking; To buildgeomechanical models based on the model of key well; To give recommendations for sidetracking candidates drilling; To analyze the interval for the windowsof kick-off by geomechanical models.

3 Problematics Slide 3 A detailed analysis of the sidetracking candidate selection requires a lot of effort for in order to give a final assessment of the need to drill candidates. The general algorithm for sidetracking candidates selection Determination of the potential well stock Inactive stock Marginal stock Injection well stock Consideration of candidates by criteria Geology Development Technical capability Economy: calculation of the expected effect, formation of the candidate rating Detailed analysis of the sidetracking candidate

Slide 4 The direction of the regional stress at the X- field is southeastern.

4 The need to take into account the criterion of "Geomechanics" when choosing sidetracking candidates The stock of sidetracking candidates, drilled along and across regional stress, was analyzed at deposit X. Slide 4 The direction of the regional stress at the X- field is southeastern. Direction of the regional stress stem along the regional stress stem across the regional stress Direction of the regional stress

5 The need to take into account the criterion of "Geomechanics" when choosing sidetracking candidates Taking into account the criterion "Geomechanics" allows to determine the optimal direction for sidetracking wells - along the regional stress, thereby contributing to the improvement of the technological development indicators. Slide 5 Average production rate of sidetracking well drilled along the regional stress Average production rate of sidetracking well drilled across the regional stress Production rate (m3/day, tones/day) Production rate (m3/day, tones/day) Month Month Number of wells Water production rate, m3/day Oil production rate, tones/day Number of wells Water production rate, m3/day Oil production rate, tones/day

The need to take into account the criterion of "Geomechanics" when choosing sidetracking candidates Slide 6 Taking into account geomechanical factors would allow to reduce the average non-productive

6 The need to take into account the criterion of "Geomechanics" when choosing sidetracking candidates Slide 6 Taking into account geomechanical factors would allow to reduce the average non-productive drilling time by 60%, and the total drilling time by 20% based on the analyzed statistics. Downtime Invalid selected range for kickoff Fracturing stops The main causes of non-productive time when drilling sidetracking wells Equipment failure Lack of circulation Dif. stickings Tight pull Non-productive drilling time (not accounted for by the criterion of "geomechanics") Non-productive drilling time (accounted by the criterion of "geomechanics") Productive drilling time

Slide 7 Taking into account the criterion of "Geomechanics" would allow to reduce drilling time of well 40098 by 30%.

7 The need to take into account the criterion of "Geomechanics" when choosing sidetracking candidates Taking into account the criterion of "Geomechanics" would allow to reduce drilling time of well 475R by 1.5 times. Slide 7 Taking into account the criterion of "Geomechanics" would allow to reduce drilling time of well by 30%. Well 1 Well 2 Unproductive time of drilling 842 hours. The amount of possible time saved by taking into account geomechanics is 440 hours. Unproductive time of drilling 1038 hours. The amount of possible time saved by taking into account geomechanics 690 hours.

8 A new criterion of "GEOMECHANICS" in the algorithm for sidetracking candidates selection Determination of the potential well stock Slide 8 Inactive stock Marginal stock Injection well stock Consideration of candidates by criteria Geology Development Technical capability GEOMECHANICS Trajectory Stresses Mud weight Economy: calculation of the expected effect, formation of the candidate rating Detailed analysis of the sidetracking candidate

9 Construction of geomechanical models. Slide 9 The location of the key well and candidate wells in an area with a similar geological and facial structure is an indispensable condition for the qualitative construction of a geomechanical model. Sidetracking candidates Well С Well B Well А (key well) Well D

10 1D model of the key well A. Slide 10 The reference model was calibrated by caliper and damage. Formation 1 Values of damages in the key well reach 10%; drilling mud - 1,4, Breakout gradient is - 1,3, the mean deviation is

11 Slide 11 orrelation of the formation 1 in the vicinity of the candidate B Well Stem azimuth, Cut-off interval, м Goal formation Calculated production for 25 years, t.t. B м. MD Formation 1 82 Interval of the cut-off ( MD) Formation 1

12 Slide 12 orrelation of the formation 1 in the vicinity of the candidate C Well Stem azimuth, Cut-off interval, м Goal formation Calculated production for 25 years, t.t. C м. MD Formation 1 71 Interval of the cut-off ( MD) Formation 1

13 Slide 13 orrelation of the formation 1 in the vicinity of the candidate D Well Stem azimuth, Cut-off interval, м Goal formation Calculated production for 25 years, t.t. D м. MD Formation 1 56 Interval of the cut-off( MD) Formation 1

Constructed geomechanical models (by the

Well C Well D Legend: Using a density 1.

in the lower zone of the cutting interval

4 g / cm3 in the well C can cause a damage

Interval of the cut-off 4 g / cm3 in the

14 Constructed geomechanical models (by the key well) Slide 14 Well A key well Well B Well C Well D Legend: Using a density 1.4 g / cm3 in the well B can cause a damage in the lower zone of the cutting interval Using a density 1.4 g / cm3 in the well C can cause a damage in the upper zone of the cutting interval Interval of the cut-off Using a density 1.4 g / cm3 in the well D can cause a damage in the upper zone of the cutting interval

15 The histogram of breakout gradients of wells-candidates. Slide 15 Well B Well C Well D

16 Comparison of wells according to statistical parameters of the breakout gradient. Slide 16 Mode 1,6 1,4 1,2 Well rating 1 0,8 Well D 0,6 0,4 0,2 0 Well B 2 1 Well C 3 Average deviatio n (*10) Arithmetic tic mean

17 The histogram of breakout gradients of wells-candidates in the interval of cut-off. Well B Well C Slide 17 Well D

18 Comparison of wells according to statistical parameters of the breakout gradient in the interval of cut-off. Slide 18 Mode 1,4 1,2 1 0,8 0,6 Well rating Well D 0,4 0,2 0 Well C 2 1 Well B 3 Average deviatio n (*10) Arithmetic Arithmet mean ic mean

19 Overall rating Slide 19 Well Breakout in the wellbore Breakout in the interval of cut-off Production B C D Overall rating скв. D скв. B 2 1 скв. C 3

candidates selection Slide 20 confidence in the

about understanding and understanding of

of wells and variants of their trajectories for

20 Advantages of the new criterion of "GEOMECHANICS" in the algorithm for sidetracking candidates selection Slide 20 confidence in the correctly chosen candidates; more information about understanding and understanding of drilling capabilities; reduction of the number of wells and variants of their trajectories for further detailed analysis; ranking of candidates by geomechanical parameters.

21 SPE Workshop OILFIELD GEOMECHANICS Slide 21 Thank you for your attention! March 27-28, 2017 Moscow, Russia

Implementation of geomechanical model to identify total loss zones

SPE Workshop OILFIELD GEOMECHANICS Slide 1 Implementation of geomechanical model to identify total loss zones Session 3. Geomechanics for drilling and completion Kalinin Oleg Co-authors: Zhigulsky S.V.;