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successful sidetrack
Abstract This paper discusses the added value of a new approach to exiting an existing wellbore, where the normal practice forces the plug and abandonment (P&A) of the existing lateral before cutting the window into a new lateral, particularly when an off-bottom cemented (OBC) liner is required. The new approach includes the construction of a Technology Advancement of Multilaterals Level 4 (TAML 4) junction to maintain well integrity and the successful development of a re-entry window that allows access to both the existing and the new slim wells. Not only has this technique unlocked massive potential, but it has also led to an enhancement in the utility and reduction in capital expenditure (CAPEX). The successful Level 4 sidetrack and re-entry window deployment is directly related to the robust system design. The application developed includes an anchor with a guide and high-torque capability, a TAML Level 4 junction created in a shape that will lead to smooth, repeatable access in the future, and a customized re-entry window system to further maximize the well potential. The true value is in allowing access to both the existing and the newly drilled lateral without using a rig or decompleting the well. Such operations use tubing exit whipstock (TEW) and pressure isolation sleeves, both of which can be run and retrieved in a rigless manner. The rigless access has allowed the existing lateral to be used as an observation well. Using permanent downhole gauges (PDHGs) enables real-time monitoring of the pressure and temperature and periodic logging to evaluate the reservoir. The newly drilled lateral can be the primary producing lateral; rigless access equally helps recover the well in case of any production challenges. The newly designed multilateral is a game changer for both mature and new developments because it maximizes reservoir production and helps reduce CAPEX by requiring fewer wells to be drilled. The improved well integrity minimizes well workover operations, which creates cost savings. This paper discusses the following aspects:A successful Level 4 junction construction from a slim re-entry existing/mature well. Repeatable accessibility to the lateral and motherbore. Meeting the motherbore objective as required. Delivering an OBC lateral liner and maintaining the well integrity.
Anchor, asia government, cement, challenging formation resulted, completion, Directional Drilling, drilling operation, integrity, junction, lateral, level 4, liner, middle east drilling technology conference, packer, real time system, reservoir, slickline, successful sidetrack, taml level 4, tEw, uae government, Upstream Oil & Gas, well-a, whipstock
SPE Disciplines:
- Well Drilling > Drilling Operations > Directional drilling (1.00)
- Well Completion (1.00)
- Production and Well Operations (1.00)
Abstract A landing section of a well in newly developed area of a field had three challenges: the well trajectory cuts through shale intervals at high inclination; the well plan was limited to a certain trajectory window where weak bedding planes failure could not be ruled out by changing the plan; the previous section's casing was short landed due to wellbore instability challenges. An effort to initiate a sidetrack twice was not successful due to wellbore collapse, therefore a new sidetrack depth had to be identified. Geomechanics group collaborated with Drilling Engineering, and Drilling fluid services to successfully initiate the sidetrack, drill the well and land the liner casing safely to bottom. A geomechanics model was built based on wireline logging data from offset wells. First, stress azimuth was constrained from oriented multi arm caliper of multiple wells around the field. Then, rock properties were derived from acoustic logging data, and the model was calibrated against drilling events and caliper enlargements. Finally, Geomechanical and petrophysical parameters were utilized to design fluids parameters and additives. A starting mud weight window was defined, and a sidetrack point was selected in strong rock interval. The well was monitored in real time where Logging while drilling, acoustic caliper, and azimuthal density image were utilized for breakouts onset monitoring. Furthermore, drilling parameters were monitored for hole cleaning and mud weight control. The stress azimuth around the field demonstrates a rotation of 15° from the north toward the east which introduced uncertainty in defining MW in the well trajectory that could be affected by rotation. The sidetrack was successfully initiated as expected, the hole was drilled to bottom, and liner landed successfully. However, a significant increase of MW from its starting value was required, and the model was subsequently adjusted based on LWD data. Maintenance of high concentration of bridging while continuously nourishing the mud helped in stabilizing the wellbore. Unlike previous sidetracks, non-productive time was eliminated with significant cost reduction.
azimuth, breakout, caliper, completion, drilling fluids and materials, drilling operation, engineering & geomechanics lead, geomechanics model, integration, international petroleum technology conference, log analysis, monitoring, non-productive time, real time system, Reservoir Characterization, reservoir geomechanics, rock property, stress azimuth, successful sidetrack, Upstream Oil & Gas, well logging, Wellbore Design
Country:
- Asia > Middle East > Saudi Arabia (0.48)
- North America > United States (0.47)
SPE Disciplines:
- Well Drilling > Wellbore Design (1.00)
- Well Drilling > Drilling Operations (1.00)
- Well Drilling > Drilling Fluids and Materials (1.00)
- (2 more...)
Technology:
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