Multilateral system
Content
Level Definitions 2
Level 2 Multilateral System 3
LEVEL 3 MULTILATERAL SYSTEM 4
LEVEL 4 MULTILATERAL SYSTEM 6
LEVEL 5 MULTILATERAL SYSTEM 8
Level 6 The Formation Junction Multilateral System 9
Level 6 DOWNHOLE SPLITTER SYSTEM 10
Level 6 Deepset Splitter SYSTEM 12
Test Facility 14
Baker Oil Tools is the industry leader in providing multilateral completions for all levels of functionality. The case histories listed below are not a complete list of every BOT completion, but rather a sample of the different kinds of multilateral installations performed to date.
About TAML Categorization
TAML (Technology Advancement of Multilaterals) is a group of operators with multilateral experience who developed a categorization system for multilateral wells based on the amount and type of support provided at the junction. This categorization makes it easier for operators to recognize and compare the functionality and risk-to-reward evaluations of one multilateral completion design to another. Recognized TAML levels increase in complexity from Level 1 (simple open hole mainbore) through Level 6 as shown.
Level Definitions
A Baker Oil Tools Level 2 multilateral system delivers a junction which incorporates a cased and cemented mainbore with an open-hole lateral that can be completed barefoot or with a slotted liner or screen. If a permanent orientation and depth control point is desired for future re-entry work, a permanent multilateral packer can be used with a WindowMaster?Whipstock a casing exit system. However, if full-bore access through the mainbore is the major concern, a retrievable multilateral packer can be used below the WindowMaster Whipstock.
A Level 2 multilateral with a permanent orientation point is constructed by setting a permanent multilateral packer (MLZXP?Liner Hanger/Packer or ML TorqueMaster?Packer) in the cased mainbore directly below the desired kickoff depth. Following a multilateral packer orientation run, the surface-oriented WindowMaster milling assembly is run and anchored into the multilateral packer. Window milling and lateral drilling are performed and the WindowMaster whipstock assembly is then retrieved. If production isolation is required during the well life, a Baker Oil Tools sliding sleeve is run in conjunction with a tieback string and a Baker Oil Tools production packer that is set above the casing exit point. When open, the sleeve allows for commingled production of both zones to the surface. However, the sleeve can be closed to shut off flow from the lateral formation. The sliding sleeve completion option DOES NOT allow for re-entry into the upper lateral.
If re-entry into the upper lateral is desired, a Baker Oil Tools Lateral Entry Nipple (LEN? can be used in place of the sliding sleeve. This LEN tool provides for thru-tubing re-entry into the lateral bore when required. Production isolation of the upper lateral is still possible through the use of an isolation sleeve that can be placed across the lateral bore opening of the LEN tool.
A retrievable packer Level 2 system is installed in the same manner as the permanent packer option; however, the multilateral packer (retrievable TorqueMaster) and WindowMaster are run in tandem, oriented simultaneously using MWD and the retrievable TorqueMaster, then set with annular pressure. After drilling the lateral, the WindowMaster and retrievable TorqueMaster assembly are retrieved, leaving full-gauge access into the mainbore.
Level Definitions
A Baker Oil Tools Level 3 multilateral system delivers a mechanically supported junction in which the mainbore is cased and cemented with the lateral open. The lateral is completed with a lateral liner anchored, but not cemented, to the mainbore. There are essentially three basic configurations for providing a Level 3 multilateral junction.
All three configurations involve first setting a multilateral packer (MLZXP Liner Hanger/Packer or TorqueMaster Packer) in the cased mainbore at a depth to allow for the desired kickoff point. Following a multilateral packer orientation run, the surface-oriented WindowMaster milling assembly is run in and anchored into the multilateral packer. Window milling and lateral drilling are then performed, and the WindowMaster?Whipstock assembly is retrieved.
In the first Level 3 multilateral option, a flow-through diverter is run then anchored into the multilateral packer. A slotted liner hanging from a liner hanger/production packer is then run into the lateral, and the packer is set in the mainbore. The slotted liner and flow-through diverter allow for commingled production. In the second Level 3 multilateral option, the flow-through diverter is eliminated. Instead, a bent joint assembly is used with surface manipulation of the drillpipe in order to divert the slotted liner into the lateral. As in the previous configuration, the liner hanger/production packer is set, supporting the lateral to the mainbore. Neither option allows access to the mainbore formation, due to the presence of the slotted liner across the junction.
A third option, using the Baker Oil Tools HOOK?Hanger system, allows for selective re-entry into the lateral and the mainbore. The HOOK Hanger is a casing joint with a pre-cut main-bore window, internal re-entry orientation profile, and a hook below the pre-milled window that is designed to catch and "hang" the lateral liner in the bottom of the casing exit window. Re-entry is accomplished using either a lateral or main-bore re-entry module as a bottomhole assembly on tubing or coiled tubing.
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