APRIL 11TH 2019

RDCR 20191st ERD Well In Western Siberia

Artur Abalian – Repsol Drilling Engineer

1

2 km

1

Well infoDrilling Project team

2

Integrated Approach3

QAQC program and

Results4

Engineering 5

Processes for perf and support centers6

10R – 1st ERD Horizontal Well in Central West Siberia Region

What could have we done better?

CONTENT:

10R ERD HW

Karabashsky

License area

KHMAO autonomy

Peer fields

2

Benchmarking: 10-R well classified as a shallow Extended Reach category

- Completion

Drilling Fluids -

- Cementing

- Directional

Drilling

ERD consultancy

Geomechanics -

- Rig services

- Mud Logging

Wireline Logging -

3

ECD management within Narrow Geopressures window

Main Challenges

Well overview

Well schematic

Time vs. Depth

Key Numbers

ZERO

2000

97.4

3785m

m

%

HSE incidents LTI=LTA=0 / Man Hrs: 194300

Total drilled Measured Depth (Main hole & Pilot)

Of Horizontal Section through the reservoir

Productive Time, with NPT = 2.6 %

MP, 2.33, 9%

TD, 8.50, 31%

RO, 5.40, 20%

WL, 5.50, 20%

CM, 2.58, 9%

DE, 3.00, 11%

Planned trajectory execution – following Catenary profile

Smooth Run of 4.5’’ Liner in 2000 m horizontal hole

Equipment preparation - key in preventing lost time events

TD – Top Drive

DE – Directional Drilling

WL – Wireline Log

RO – Rig Others

MP – Mud Pumps

CM - Cementing

4

Road Map of the Well Construction Project

QAQC campaign

Drilling Operations

Rig Down & Demob

ERD training

DWOP

Close-Out

July 2017 Sep 2017

IWCF training

Nov 2017 Dec 2017 Feb 2018

LOGOP HAZID

Apr 2018

PR

TR

Project was planned and executed within half of a year

Engineering Planning

Procurement Processes

Rig Acceptance

P. S. - acronymsPR -- Peer ReviewTR -- Technical ReviewLOGOP -- Logistics on PaperHAZID – Hazards Identification

5

Project Planning Process

Design validation -

3x

Offset analysis

Trajectory

Drilling

Fluids

REPSOL Russia Core Drilling team

REPSOL Global Drilling team- PEER Review

MERLIN ERD

▪ FF Calibration▪ Tortuosity prediction▪ Operational problems

analysis

▪ Critical equipment validation

▪HSE & QAQC programs Supervision

1 2

Pseudo-catenary

type 3

▪ PST (production screen test), RPT (return permeability test) performed

▪ Mineral OBM with OWR = 80/20; Kinematic Viscosity = 2 mm2/s; Sag<0.5

▪ Mud treatment & displacement plans

Idea to involve several parties to cross-reference and validate outputs

▪ Optimized Casing design▪ PP_FG prognosis▪ Trajectory issues▪ WBS issues

Guide for Proper data capture

6

QAQC Program & Results made possible to avoid equipment failures and potential LIH incidents

3 thread connections rejected – Rework

1 Jar Polish shaft Rejected

(cracks indications – Replaced)

1 LWD tool Rejected collar hatch pockets

imperfections (Rejected – Replaced)

1 LWD tool Rejected. Washouts on the pulser

mechanism

16 days of In-house Csg inspection

12 ¾’’ Conductor – 9 pipes inspected

9 5/8’’ Surface Csg – 80 pipes inspected

7” Production Csg – 200 pipes inspected

One 7” Csg rejected. Drift did not pass.

3.5’’ DP inspection rejection

306 pipes rejected (corroded threads, worn

hardbanding, axial misalignment)

Involved TOP mngmnt (CEO) in 3.5’’ DP issue.

Drilling contractor accepted faulty work.

Quality meeting held.

Corrective actions agreed.

Rig inspection by own and external recourses

32 Non conformances found

13 – Critical

10 – Major

9 – Minor

Rig Refurbishment 70%

Findings

7

24/7 monitoring

and support

Office hours monitoring

Core Management team

Real-Time Operations supervision and support was performed 24/7

STC-DSC* - GPN Science & Technology center. Real-Time Drilling Support center

MEMBERSFUNCTIONS: WORKFLOW

Rig SensorsDaily reports

+ DD / LWDdata + Mud dataDrilling Metrics

Office extended team

TEAM

▪ Drilling program execution▪ Plan of Actions preparation▪ Contractors Management▪ Inventory control▪ Drilling Engineering▪ Drilling practices training▪ Tool Box Talks 10R Well site

STC-DSC*

NORMAL REPORT

ALERT

RECOMENDATION

Notification line Decision line

BHGE DD engineer

Drilling Fluids advisor – TPI

Well Site Drilling Engineer

Drilling Supervisor on site

Well Site Geologist

MERLIN advisor

Support DE team

Project Lead

▪ Operations follow up▪ Support in Decision making▪ Support in Trouble solving▪ Engineering QC▪ Plans of Action Validation

▪ Real-time Drilling monitoring

▪ Support on engineering▪ Alerts issuance▪ Simulations validation▪ KPI analysis

Information line

+Geomechanics team

8

10-R well

Narrow window of Collapse gradient vs Fluid

Loss gradient

10-R well oriented in the direction of Shmin

to maximize wellbore stability

Mud rheology had a dominating

influence which was confirmed by the fact

ERD best practices were implemented to

manage ECD which was a major challenge

ECD Tornado chart

Geomechanical model was updated in RT for constant wellbore condition monitoring and quick reaction on any issues

9

Engineering QC performed on-site by matching simulations from different software. E.g. Triple check on Liner RIH case

Landmark Well Plan TAD Pro - Merlin SLB ERA software

4 ½” Liner SCREEN RIH

10

RESULTS & Way forward

Added Value

4

Feasibility

3

1

2

1

2

3

4

5

1. Drill ERD well with WBM

fluids

2. RIH ordinary Screen with

non HT connection

3. Fishbones Drilling

4. MTL well Drilling

What is next ?

6

Proved Feasibility of Drilling shallow ERD well with 2 km lat

Demonstrated Effectiveness of QAQC and HSE focused

approach

Accumulated important Engineering Data

(FF, Hydraulics match, Cuttings load %) and Operational LL

RT surveillance appeared to be very helpful in engineering

validation and decision making – will be applied at future

ops (Repsol – Inwell / GPN – NTC)

Defined Areas for optimization (Drilling Fluids, Completion)

Rig Personnel training and involvement into Project

Planning played important Role in the Project Success

Advice

FeedbackConcern/Questions