Subsea Well Control Services

Subsea

Well Control

ServicesAdvanced systems and centrally managedworldwide support of personnel and processesfor subsea well control

www.slb.com/welltesting

07-WT-055 September 2007 *Mark of SchlumbergerCopyright © 2007 Schlumberger. All rights reserved.

Subsea

Well Control

Services

THE UNIQUE CHALLENGES OF COMPLETING AND TESTING SUBSEA WELLS

The subsea environment presentstechnological challenges unlike anyencountered by operators develop-ing platform- and land-based assets.To maximize asset value and ensuresafety, development strategies mustconsider the complexities of the off-shore environment—water depth,weather conditions, ocean currents,equipment reliability, and well acces-sibility, to name but a few. As thetrend toward drilling in deeperwaters continues, seeking safer,more effective technologies for welltesting, completion, and interventionoperations has never been moreimportant.

PUTTING A TURNKEY GLOBALRESOURCE AT YOUR DISPOSAL

Achieving operational efficiency inthis challenging environment requiresmore than optimally engineered sys-tems. True assurance of efficiencycomes when your local operationreceives the full support of a centrallymanaged global network. A networkwith an ever-increasing knowledgebase and proven expertise developedthrough long-term experience in the most challenging subsea envi-ronments. In its 30-plus years ofproviding subsea well control serv-ices, Schlumberger has developedsuch a network.

To each operation, we commit a localteam dedicated to exceeding ourclients’ expectations for quality,health, safety, and protection of theenvironment (QHSE) performanceand supply chain management. Theworldwide Schlumberger organiza-tion enables us to staff your projects

Advanced systems and centrally managedworldwide support of personnel and

processes for subsea well control

Our subsea well control services are supported by experienced, trained personnel from program design to project completion.

with our own employee specialists,not subcontractors, who understandthe particular requirements in your geographic area.

Ensuring global consistency of alllocal operations are Schlumbergerpersonnel in our

■ Subsea Headquarters, Paris, whoset standards and guidelines forconsistent business conduct, train-ing, and service implementation

■ Schlumberger ReservoirCompletions Center, Rosharon,Texas, who focus on engineeringand sustaining product excellencefor integrated completion and production systems

■ Europe Learning Center, Paris, whoprovide all levels of project man-agement and subsea well controltraining for engineers, specialists,and operations personnel. Thestructured courses conductedhere ensure a consistently highstandard of operations through-out the world.

Also underpinning the efforts of theonsite teams are dedicated engi-neering resources available 24/7through an internal online supportand knowledge management system.

SUPPORTING YOUR OPERATION,FROM BEGINNING TO END

Schlumberger subsea well controlspecialists work with you from projectplanning, through implementation, to project completion. We partnerwith you to define functional require-ments for your well control systemand to establish interfaces with alloperational groups. We have the

established processes, the people,the technologies, and the engineeringand manufacturing capabilities todeliver integrated solutions for anysubsea completion and testing operation.

Schlumberger well control specialistsat client sites are experienced andhighly trained. They are prepared torespond quickly to any change inconditions and to interface smoothlywith all other operational personnel.

Additionally, we assign a skilled project manager to serve as yoursingle-point contact for all technical,commercial, and contractual matters.Our program of life-of-the-field proj-ect management support includesexpert input to hazard and operabil-ity studies, and it helps optimizeoperations, maximize production,and minimize operator risk.

GROWING THE KNOWLEDGE BASE

To aid in operations efficiency andsafety, we use the Quest knowledgemanagement system for reporting,scheduling inspections, recording all QHSE incidents, performing riskanalyses, and tracking all aspects ofemployee QHSE training and develop-ment. In this Internet database, wecapture, review, and refine best prac-tices and lessons learned to ensurethat each of our clients gets the full benefit of every one of our subsea well control experiencesand successes.

ONGOING SUBSEA WELL CONTROL TRAINING AND DEVELOPMENT

All Schlumberger subsea well controlpersonnel participate in our world-wide LMS Learning ManagementSystem training program, and theyare commissioned to support ourclients only after meeting criteria

related to field seniority and famil-iarity with the hardware andoperational routines.

Field engineers, field specialists, andoperators attend fixed-step trainingprograms at our dedicated facilitiesin Paris.

All subsea well control servicesemployees carry a SchlumbergerQHSE passport that documents a rigorous review cycle to ensure com-plete awareness of, and compliancewith, required training and compe-tency standards. Exact records aremaintained in QUEST or LMS for

■ certification

■ courses

■ objectives

■ other essential QHSE information.

Schlumberger is committed toensuring that our subsea well controlservice capabilities are ever-expanding and ever-improving.

Each local operation is fully supported by a centrally managed global network.

RELIABLE, VERSATILE SUBSEA CONTROL SYSTEMS

The SenTREE* subsea well controlsystems are versatile performers forcompletion and testing operations.Ranges of sizes, pressure and tem-perature ratings, and control systemconfigurations permit designs for avariety of subsea completion and well-testing applications, water depths,and wellbore conditions.

The SenTREE family of well controlsystems includes the SenTREE 7 and SenTREE HP subsea completiontest trees (SCTT) and the SenTREE 3subsea test tree (SSTT). The flexi-bility of these systems makes themideal for integration with any subseaconfiguration.

The SenTREE system’s standardizedmodules provide the flexibility tomeet the specific requirements ofeach project with minimal systemcustomization. SenTREE modularityreduces system and interface com-plexity, thus enhancing reliability andservice quality while increasingsafety and operations efficiency.

QUALIFIED THROUGH RIGOROUSTESTING

To ensure performance reliability,SenTREE well control systems arethoroughly tested and qualifiedthrough in-house factory accept-ance techniques and externaltesting facilities. SenTREE systemsand components are tested in a specially constructed hyperbaricchamber at the SchlumbergerReservoir Completion Center inRosharon, Texas, where pressurescan be created to match the subseaconditions for any job.

OUR EXPERIENCE RUNS DEEP

Building on many years of experi-ence providing subsea well control services, Schlumberger launchedthe SenTREE family of completionlanding string systems using directhydraulic control for operations fromanchored vessels. While times varydepending on water depth andumbilical length, the direct hydrauliccontrol system requires approxi-mately 120 s to close the SenTREEvalves and disconnect.

For operations from dynamicallypositioned vessels, Schlumbergerdeveloped another special controlsystem. In 2001, the Commander*system became the industry’s firstfast-acting control system to enablecompletion installation and flowbackoperations from dynamically posi-tioned vessels.

The fast-acting Commander controlsystem requires only 15 s to closethe SenTREE valves and disconnect.It is an intelligent, integrated controlsystem that requires one simple,small-diameter umbilical to operatethe SenTREE family and all associ-ated tubing hanger running tool andcompletion equipment functions. Acommunications system for controland telemetry feedback providesdata to enhance well operationsmanagement.

To date, Schlumberger has com-pleted hundreds of subsea wellcontrol jobs using SenTREE SCTTsystems with direct-hydraulic orfast-acting control systems.

APPLICATIONS

■ Well control

■ Well operations management

■ Subsea completion installation

■ Intervention

■ Well testing and cleanup

FEATURES AND BENEFITS

■ Modular flexibility for meetingspecific requirements withouthaving to design custom systemsfor each operation

■ Simplified integration with anysubsea BOP stack

■ Standardization of modularcomponents to improve safetyand reliability

■ Monitoring and feedbackcapabilities to reduce operatorrisk and provide data and communication for operationsmanagement

■ Proven technology and a longhistory of subsea experiencethat ensure reliable systemperformance

■ Support by experienced, trainedpersonnel from program designto project completion

■ Reliable operations in deep-water and ultradeepwaterenvironments

■ Range of control systems tofacilitate efficient, low-riskoperations

■ Two-way communicationstechnology that enables rapidshutdown operations fromanchored or dynamically positioned vessels

■ Well isolation and landingstring disconnect capabilitywith no shearing

■ Reduced rig time for completion,Christmas tree installation, andflowback operations

■ Completion installation verifications, including tubinghanger setting and sand control integrity

■ Early reservoir informationavailable upon completioninstallation

Fast-acting control systems are ideal for completion installations and well test applications performed from a dynamically positioned vessel and can provide function-status monitoring to assist with management of completion operations.

Completion and testing services for subsea wells can be performed from anchored or dynamically positioned vessels using the SenTREE family of systems.

The flexibility of SenTREE systems suits them ideally for integration with any subseaBOP stack and completion, well-test, or Christmas tree system. Completion operationsbefore installation of conventional Christmas tree or DST operations (left) and comple-tion operations with a horizontal Christmas tree (right) are shown above.

A SMALLER IN-RISER CONTROLSYSTEM FOR THE SenTREE FAMILY

With the introduction of theSenTURIAN* fast-acting control system in 2007, Schlumberger rein-forced its technology leadershipposition for subsea completioninstallation and testing operations.Evolutionary upgrades have beenincorporated into the SenTURIANsystem based on the knowledge andexperience gained with the market-leading Commander control systems.

System features include simpleoperation and maintenance, alongwith modularity that enables cus-tomization to meet project-specificrequirements.

The SenTURIAN system design addsa smaller footprint and increased operational flexibility, requires lessinline offshore time for rig-up, simplifies hardware handling, andreduces hardware installation andrunning time. Additionally, it uses a form of direct electrohydraulic

control that lowers the number ofelectrical lines, thereby reducing the overall diameter of the umbilical cable.

This fast-acting system provides total control of the SenTREE family,tubing hanger running tool, and com-pletion equipment functions, alongwith monitoring to assist in manage-ment of the completion installationand flowback operations. It canclose all valves within the SenTREE system and unlatch in 15 s.

The SenTURIAN control system isengineered for use with all SenTREEsystems, in water depths rangingfrom shallow to 4,572 m [15,000 ft],for completion installation and flow-back operations from dynamicallypositioned vessels. The simplicity ofthe SenTURIAN control system alsosuits it for some applications fromanchored vessels.

The SenTURIAN control system isdesigned in accordance with reliabil-ity specifications IEC 61508, SIL 2 forsafety-related systems. This designapproach sets a new industry bench-mark for reliability of in-riser subseawell control systems.

Like the Commander system, theSenTURIAN fast-acting control systemcan close all the valves in a SenTREE system and unlatch in 15 s.

SenTREE Subsea Well Control Systems Reliable, Versatile, EfficientGlobal Support Network

■ Safer, secure well access

■ Versatile system combinations

■ End-to-end project management