Corin ringApplications andTech chnolo logy Tools for Geologic Modeli eling of Petroleu roleumReservoirs oirs
Worldwide leader inreliable, innovativedrillingsolutions At Baker H ughes INTEQ, we’re committed to deli vering reliable, innovative drilling solutions for our clients. And that’s just what wedo everyday–on thousands of wells worldwide. Our experts apply critical wellbore construction technologies that create value by placing wells more accurately within the reservoir and drilling them to TD more efficiently. We offer systems and expertise for directional and horizontal drilling in both new and re-entry wells, advanced evaluation systems that provide true wireline replacement, and innovati ve drilli ng fluids that deliver excellent drilling properties while preserving both the environment and your well’s production potential.
HS&E is a Priority Baker Hughes INTEQ is committed to maintaining a safe working environment for all employees, contractors, and customers and to preventing environmental pollution. To improve our interface with customer HS&E programs, Baker Hughes INTEQ has established and implemented consistent HS&E policies and procedures throughout its oilfield operations group.
QualityManagementSystems At Baker Hughes INTEQ, accredited quality management systems assure product quality and also provide the foundation for continuous improvement. More than 20 of our facilities have achieved ISO or Q1 certification.
CoringApplicationsand Technology
Detailed information from target formations is essential for the successful evaluation of both primary and secondary recovery programs. Core samples can yield this critical subsurfaceinformation. With quality cores, oil companies can more fully understand formation characteristics and more efficiently achieve production objectives. High quality cores provide the most accurate lithology, porosity and permeability information for building the geologic model of the reservoir. Such models are important tools, for example, in evaluating horizontal and vertical permeability.
The core sample is only as good as the formation data that can be derived from it .
Core samples can provide the petrophysicist and the reservoir engineer with accurate saturation, wettability and electrical properties of the formation. When secondary displacement is the objective, core sample data are essential. Core quality is the key. The sample must be obtained without altering its native (or in-situ) properties. Informed application of specialized tools and techniques can produce quality core samples.
Careful review of core and log data can yield critical subsurface information.
During the well planning phase, Baker Hughes INTEQ coring specialists can help you determine which coring technologies can contribute most to achieve your goals. We can conduct rig site operations safely to deliver high quality cores, and working with your team we can optimize coring system solutions for lower cost.
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Planning the Coring Program We offer a full range of coring systems to obtain high quality core samples in conventional applications. For complex and difficult applications, we can provide advanced technology to ensure high quality coring. CoreDrill™ Evaluation Coring
Where core points are uncertain or when coring appears to add excessive rig time, our CoreDrill system combines high ROP, quick inner barrel changes and fewer drillstring trips to produce good quality core samples at low cost. Oriented Coring
Special orienting tools scribe a mark on the core so that formation dip and strike can be determined from the core. CoreGard™ Low Invasion Coring
A system of low invasion drilling fluids, anti-whirl core bits and extended pilot shoe features minimizes fluid filtrate invasion of the core. Gel Coring
Baker Hughes INTEQ’s Coring Team plan s a ful l range o f coring services to satisf y your coring objectives.
Anti-Whirl Technology
In certain formations and well paths, bit whirl may cause core damage or undergauge cores. Our coring engineers can determine when to use anti-whirl bit technology to minimize these problems.
High Pressure/ Fluid Retained Coring
In-situ data gathering services employ proprietary pressure containing core barrels that collect and preserve intact formation samples and their fluids.
SM
The INTEQ Gel Coring system preserves core wettability characteristics and mechanical integrity to gain quality information from formation samples.
JamBuster Anti-Jamming SM
This anti-jamming system uses telescoping core barrel sleeves to avoid premature termination of the coring run. Wellsite Core Evaluation
Our Wellsite Core Evaluation service is conducted in transportable laboratory modules. We can furnish quick preliminary evaluation of core samples, and also cut and preserve core samples for detailed laboratory analysis.
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High Torque and Coremaster Barrels
These special coring tools include unique and patented equipment: • High torque and heavy duty core barrels • LD adjustment system • Optional, special application components. These and other special coring tools achieve best results when planned as part of your drilling and evaluation program.
CoreDrill EvaluationCoring Most of the conventional coring expense is associated with rig time needed to trip the coring assembly in and out of the well. This applies particularly in exploration wells where core point determination is difficult or where reservoir sections are separated by long intervals. CoreDrill saves time because:
Our CoreDrill tools enable alternate drilling and coring without tripping the bottomhole assembly. T he CoreDrill system employs a core bit that converts to a drill bit, and features a heavy duty core barrel that allows slickline retrieval of the inner barrel and core.
• Changeover from coring to drilling is accomplished without tripping the drillstring • The inner corebarrel is wirelined to bottom from the surface • Near-bit gammalogging (MWD) in the drilling mode identifies core points • Anti-Whirl PDC core bits stabilize the bit and improve core quality • Inner barrel and core are retrieved quickly and efficiently by wireline.
An inner rod assembly converts the CoreDrill system into a drilling tool for drilling down to, between and beyond core points.
barrel and a specially designed PDC plug. It can operate in the 7⅞" to 8¾" hole size range, and can be run in 15 ft (4.57m) to 120 ft (36m) lengths to deliver 2" diameter core. The CoreDrill system can produce continuous core samples of superior quality compared to sidewall cores.
CoreDrill II, an advanced technology coring system, employs near-bit, real-time gamma logging in the drilling mode. Core points can be selected accurately without having to rely on rig floor detection of drilling breaks. The standard 30 ft (12m) CoreDrill assembly uses a 6¼" x 2"
CoreDrill coring bit saves rig time by converting to a drilling bit without drillstring trips.
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Oriented Coring Oriented Coring gathers comprehensive and reliable information on fracture direction, the dip and strike of beds, and the direction of stresses. When a core is oriented, hole azimuth and inclination are recorded along with the directional orientation of a reference mark on the core itself. Simple equipment and procedures make this service economical and versatile with both conventional and advanced technology coring systems. Wellbore Inclination Scribe Line Azimuth
N
CoreGardLowInvasionCoring CoreGard Low Invasion Coring minimizes drilling fluid filtrate invasion of core material as it is being cut. The system consists of three key components: Low Invasion Drilling Fluid
The low invasion drilling fluid uses sized calcium carbonate to provide bridging solids which quickly form a stable filter cake on the core. This built-up filter cake creates aprotective coat on the surface of the core to prevent filtrate invasion into the pore spaces. Low Invasion Core Bit
The specially-designed, low invasion core bit features face discharge ports, no gauge cutters in the throat, a parabolic crown profile, and large
PDC cutters. Face discharge ports direct fluid flow to the cutters, away from the column of core being cut. The parabolic profile and large cutters of our Low Invasion core bits reduce the cutting area and provide faster rates of penetration. There are no throat gauge cutters to disturb the filter cake as the core enters the inner barrel. These features allow the filter cake to remain undisturbed. Anti-whirl features can be incorporated into the bit as well. Extended Pilot Shoe
An extended pilot shoe protects the core from additional contact with coring fluid.
TVD
Oriented coring helps determine bedding angle and formation fracture/stress direction. Custom designed CoreGard core bits are available t o suit unique a pplications and ho le sizes.
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Gel Coring Gel Coring technology prevents static filtrate invasion and preserves wettability properties of core material. The system features two unique elements: • A pre-loaded inner barrel containing a non-invasive encapsulating gel • Downhole encapsulation of the core sample to isolate it from the drilling fluid. Fluid invasion can alter the chemical and physical properties of core material. In-situ fluid saturations can be changed as well. Gel Coring protects the core by minimizing the core’s contact with drilling fluid. The gel totally encapsulates the core as it is formed downhole and supports the core during tripping out of hole and transport. Gel Coring benefits include: • Preservation of chemical and physical properties of the core • Elimination of static filtrate invasion in the inner barrel • Protection of the core’s mechanical integrity • Significant reduction of core jamming.
Standard Baker Hughes INTEQ gels are viscous polyethylene-glycol based formulations that exhibit 0.0 cc spurt loss in formations with permeabilities as high as 10 darcies at 200˚F (93˚C) for 30 minutes. They improve the lubricity between the core and the inner barrel.
Our Lubricore™ line of gels was developed specifically for lubricity properties. Lubricore gels are recommended for coring long horizontal intervals and formations that are prone to jamming.
Coring Fluid Gel
A. Core in innertube is protected against coring fluid by gel coating. B. Gel protection begins at the bit as soon as the core is cut.
A
B
T e m p e r a t u r e ' C
s r a B e r u s s e r P
Time, minutes
Data obt ained from t he dow nhole Gel Pressure Mea suring Sub - an optional tool available f or Gel Coring runs.
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Anti-Whirl Technology Our PDC coring bits apply antiwhirl technology to reduce dynamic bit whirl. Bit whirl, known to cause PDC cutter damage in harder formations, occurs when the core bit does not rotate smoothly about its geometric axis. In addition to causing cutter damage, bit whirl leads to poor penetration rates, reduced bit life and core barrel jamming. Dynamic bit whirl also can have serious detrimental effects on the core itself, and can result in undergauged and fragmented cores. Anti-Whirl (ARC) corebits combine several features that optimize performance: • Optimal cutter layout and profile • Reduced cutter count • Low friction gauge pads.
Core samples cut wit h an Ant i-Whirl core bit (left) and a bit exhibiting bit w hirl (right)
W ellbore bottom hole patterns illustrating Anti-W hirl performance (left) and bit w hirl (right) Full scale laboratory tests at Hughes Christensen demonstrate that anti-whirl technology eliminates hole spiraling and core damage caused by dynamic bit whirl.
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GoldSeriesTechnology ARC bits are available with the patented Gold Series Black I ce™ cutters. These cutters incorporate stressed engineering, engineered placement, Carbide Supported Edges (CSE™ ), and polished PDC cutters to significantly optimize bit performance and life. Stressed Engineered Cutters (SEC™ ) use a thick diamond table for reinforcement against bending loads. A radial interface design reduces and redistributes stresses in the cutter. Polishing reduces the friction forces between the cutter and rock chips. Rates of penetration, drilling efficiency, and bit life are substantially improved with Gold Series technology. PDCCoringBits Our PDC coring bits deliver high penetration rates and long bit life. They maintain a sharp cutting edge in soft to moderately hard formations.
CSE cutter’s “buttressed edge” geometry dramatically strengthens the diamond edge against the cutting force.
SEC cutter wi th thicker section modifi es stress distribution, provides extra stiffness and more w ear resistance in abrasive formations.
Black Ice
SEC cutter’s stepped interface geometry reduces damaging stresses and repositions them aw ay from the cutting edge.
cutters optimize performance and bit life.
ARC412- Light Set PDC Anti-Whirl
ARC425- M edium Set PDC Anti-Whirl
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J amBuster Anti-J ammingSystem The JamBuster™ anti-jamming system employs telescoping inner sleeves to reduce the impact of jamming by allowing continued coring after jamming has occurred. Coring can continue until three jamshave been detected or the barrel fills. Core jamming is a common cause of aborted coring operations. It can be caused by several factors: • Formation anomalies • Core bit design and dynamics • Inner sleeve and core catcher configuration. The JamBuster system is fitted into a high torque 6¾” x 3½” core barrel and incorporates the following features:
• Two telescoping sleeves within one fixed aluminum inner barrel • Shear pins that lock the sleeves together until jamming occursshear strength point is set to match formation properties • An internal core jam indicator. The system can be used in conjunction with Anti-Whirl core bits, CoreGard low invasion coring technology, and the Gel Coring System. Field data indicate that improved coring efficiencies of 30-50% are achievable in formations having a fault slant, collapse of unconsolidated core material, or clay expansion.
JamBuster Core Barrel Options Core Barrel
Size
HT 30
6-3/4” x 3-1/2”
Minimum Inner Shear pins Length Sleeve/Barrel
60’
Aluminum
8 inner
Fixed Inner Core Barrel Activator Plate
Telescoping Inner Sleeves
Upper Shoe
Hole Size
8.375” - 8.75”
Shear Pins Core Bit and Outer Core Barrel
12 middle Core Master
7-1/4” x 6-3/4” x 3-1/2”
60’
Aluminum
8 inner 8.375” - 8.75” 12 middle
Shear pins for telescoping sleeves are selected according to format ion characteristics. Inner sleeves can be delivered to rig site factory-loaded with gel to encapsulate core as it is formed.
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HighPressure andFluid Retained Coring Pressure and fluid retained core barrels are key components of our In-Situ Data Gathering Service (IDGS). These special barrels are available in two sizes: • 5¾” (6” ball valve) • 7” (8” ball valve). IDGS can attain better reservoir definition using a combination of current coring technologies (such as low invasion coring, anti-whirl core bits, pressure-fluid retained full closure core barrels, and Gel Coring). The pressure barrels collect reservoir fluids in their natural container, the rock.
The result is a reservoir sample that has sustained little formation damage, arriving at the surface totally encapsulated by gel and containing nearly all of its reservoir formation fluids intact. Depending upon the goals of the application, IDGS can obtain information on reservoir fluids, formation saturations, and mechanical rock properties. If required, downhole pressure can be maintained in the barrel. Reservoir fluids are retained in the barrel until they can be captured for analysis. IDGS is the best method for coal bed methane applications.
Bearing Assembly
Seal Sub
Pressure Core Barrel Specifications Item
5-3/4” Tool
7” Tool
10 ft (3.05 m)
15 ft (4.57 m)
10 ft (3.05 m)
30 ft (9.14 m)
Core Diameter
2.50 in (6.35 cm)
2.50 in (6.35 cm)
3.75 in (9.53 cm)
3.75 in (9.53 cm)
Upper Seals
Barrel Length (Closed Coring Position)
21.75 ft (6.34 m)
26.75 ft (8.15 m)
24.2 ft (7.88 m)
44.16 ft (13.46 m)
Drilling Fluid
Barrel Length (Extended Ball Valve Closed)
23.33 ft (7.11 m)
28.22 ft (8.64 m)
26.6 ft (8.11 m)
46.52 ft (14.18 m)
Ball Housing Length
1.0 ft (0.31 m)
1.0 ft (0.31 m)
2.5 ft (0.76 m)
3.6 ft (1.10 m)
Core Barrel Diameter
5.75 in (14.61 cm)
5.75 in (14.61 cm)
7.00 in (17.78 cm)
7.00 in (17.78 cm)
Pressure Rating
10,000 psi (68,948 kPa)
10,000 psi (68,948 kPa)
5,000 psi (34,474 kPa)
5,000 psi (34,474 kPa)
Minimum Yield Strength
110,000 lbs (489,280 N)
110,000 lbs (489,280 N)
110,000 lbs (489,280)
110,000 lbs (489,280 N)
Minimum Flow Rate
125 gpm (473.18 lpm)
125 gpm (473.18 lpm)
300 gpm (1135.6 lpm)
300 gpm (1135.6 lpm)
Recommended Core Bit
6-1/2” x 2-1/2”
6-1/2” x 2-1/2”
8-1/2” x 3-3/4”
8-1/2” x 3-3/4”
Top Connection (Box)
4-1/2” FH
4-1/2” FH
4-1/2” H90
4-1/2” FH
Ball Housing Diameter
6.0 in
6.0 in
8.0 in
8.0 in
(15.24 cm)
(15.24 cm)
(20.32 cm)
(20.32 cm)
Pressure Regulator
Inner Tube Ball Valve Operator
Ball Valve
Core Barrel
Pressure Core Barrel
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Wellsite Core Evaluation Proper handling of the core at the well site is as critical as its acquisition. The core must not be damaged by the handling process. A core recovery cradle should always be used to secure the inner tubes on removal from the outer barrel to prevent bending of or physical damage to the core. Exposure of the core to air also should be kept to a minimum. To prevent filtrate invasion during transportation or storage of the core, special plug samples should be prepared immediately. We can provide the needed core cutting and plugging equipment on location. These services can be very valuable in remote locations and where restrictions are imposed on the removal of full diameter core material. For wellsite core evaluation, we provide a portable unit that contains core cutting, plugging, and preservation equipment as well as a core holder and permeameter for flushing core samples and determining liquid permeability.
The INTEQ formation evaluation engineer assists operator personnel in wellsite analysis of core samples.
Rig Site Core Stabilization Stabilization protects the core from damage during handling and shipment. We secure the full diameter core material in an aluminum or fiberglass inner barrel by injecting quick-setting epoxy or foam.
W ellsite Core Evaluation i s an on-site service.
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GammaTrakSystem For preliminary sample evaluation, the computer-controlled GammaTrak portable gamma tool can provide on-site lithology evaluation. A continuous gamma detection log along the entire cored section identifies reservoir and clay zones comparable to conventional wireline and M WD logs. Manually operated hand-held gamma detectors also are available.
The GammaTrak system logs the recovered core on the laydow n table.
GammaTrak logs delin eate reservoir an d clay zones.
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HT Series andCoremaster Barrels Our HT Series™ and Coremaster™ heavy duty core barrels were designed for use in high torque applications. The heavy duty barrels are ideal for long core barrel applications and for coring in highly deviated wells along with all conventional coring operations. HT Series and Coremaster core barrels optimize penetration rates even in conventional applications because they can operate at high ROP and weight-on-bit without torque damage to the core barrel connections. These core barrels: • Use integral SC-1 (premium quality) core barrel stabilizers • Have a double shouldered tool joint and specially designed thread
• Incorporate our patented LD adjustment system [22-inch (56 cm) adjustment] • Can accommodate long, disposable inner barrels [to 360 ft (110 m) lengths]. HT Series and Coremaster core barrels deliver full diameter cores. All optional and special-application coring components are compatible with these barrels. InnerBarrel Stabilizer The heavy duty outer core barrel rotates about the inner barrel during coring operations. If the inner barrel rotates with the outer barrel, the core can jam in the inner core barrel. Inner barrel rotation can be severe in deviated/ horizontal holes where the inner barrel tends to sag and rub the outer barrel. Severe vibration can occur in vertical holes with the same effect.
Our patented inner barrel rotating sleeve stabilizer: • Is designed for use with long coring assemblies • Can be used with disposable aluminum or fiberglass inner barrels • Is most effective with bit end bearings to reduce inner barrel rotation • Facilitatescore entry and reduces mechanical damage and jamming. With the stabilizer, buckling resistance of longer inner barrels is improved, increasing coring efficiency and improving core quality.
Core Barrel Specifications Core Barrel
Barrel Size Inches
350
3-1/2” x 1-3/4”
MCS MCS
3-3/4” x 2” 4-3/4” x 2-5/8”
250P 250P 250P 250P 250P 250P
4-1/8” x 2-1/8” 4-3/4” x 2-5/8” 5-3/4” x 3-1/2” 6-1/4” x 4” 6-3/4” x 4” 8” x 5-1/4”
HT 10 HT 30 HT 40
4-3/4” x 2-5/8” 6-3/4” x 4” 8” x 5-1/4”
Coremaster Coremaster
4-3/4”x 3-1/4”x 2-1/8” 7-1/4” x 6-3/4” x 4”
CoreDrill1 CoreDrill2
6-1/4” x 2” 6-1/2” x 2”
Hydro-Lift Hydro-Lift
6-3/4” x 4” 8” x 4-3/4”
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Make Up Torque ft lb
Fluid Capacity
Nm gpm Slimhole Core Barrel 2,200 2,983 118 Modular Coring Systems 4,800 6,500 100 10,000 13,600 130 Conventional Core Barrels 3,500 4,745 141 4,700 3,672 164 8,600 11,660 204 9,400 12,745 275 11,100 15,050 387 21,900 29,693 295 High Torque Core Barrels 10,000 13,558 164 30,000 40,675 387 40,000 54,233 295 Heavy Duty Barrels 13,200 18,000 160 19,600 26,500 450 CoreDrill Core Barrels 17,000 23,049 300* 33,000 44,742 300** Hydro-Lift Core Barrels 11,100 15,050 200 21,900 29,693 250
lpm
Recommended Maximum Pull lbs N
447
104,000
462,592
375 490
180,000 314,000
800,000 1,400,000
534 621 722 1,041 1,465 1,117
172,000 232,000 328,000 365,000 407,000 602,000
765,056 1,031,936 1,458,944 1,623,520 1,810,336 2,677,696
621 1,465 1,117
250,000 530,000 600,000
1,112,000 2,357,440 2,668,800
605 1,701
385,000 666,000
1,712,480 2,962,368
1,136 1,136
521,000 749,000
2,317,408 3,331,552
757 946
407,000 602,000
1,810,336 2,677,696
* 300 (1,136) in coring mode 400 (1,514) in drilling mode * * 300 (1,136) in coring mode 550 (2,083) in drilling mode
ContainerizedCoring Baker Hughes INTEQ disposable inner barrels and liners offer significant advantages for containerized coring in all formations.
These core containers protect the integrity of the core material during recovery and handling. The coefficient of friction between the core and the inner barrel also is reduced. Containerized coring:
AluminumInnerBarrels To maintain core integrity during handling and transportation, the aluminum inner barrel replaces the steel inner barrel. Particularly useful in high-temperature and high-pressure applications, multiple 30 ft (9.14 m) aluminum inner barrels can be connected to construct core barrels of 60, 90, 180 ft or longer (over 55 m). The core-filled inner barrel can then be cut, capped, sealed and transported to the laboratory using a full range of wellsite handling equipment.
• Improves core quali ty and core recovery • Produces less core jamming • Reduces rig time. Disposable aluminum and fiberglass inner barrels and plastic, fiberglass and aluminum barrel liners have become standard for containerized coring.
Fiberglass Inner Barrels Fiberglass inner barrels [30 ft (9.14 m)], which also may be connected into longer lengths, are run inside the core barrel to contain unconsolidated or friable core material. However, material constraints limit the use of fiberglass inner barrels to bottom hole temperatures of 250 F (121 C) or less.
Containerized cores remain in the protective inner barrel or liner when retrieved. The containers permit well site core gamma logging when required.
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Aluminum, Fiberglass and Plastic Liners In soft, friable, broken or unconsolidated formations, aluminum, fiberglass or plastic liners can be placed inside the standard steel inner barrel to ensure recovery of virtually undisturbed cores in lengths to 60 ft (18.29 m).
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Aluminum and Fiberglass Inner Barrels Properties
Aluminum 6 3/4” x 4” Barrels
Fiberglass
Wall Thickness
0.250” (6.35 mm)
0.244” (6.20 mm)
Collapse Pressure
2333 psi (16 N/sq mm)
580 psi (4 N/sq mm)
Burst Pressure
3800 psi (26 N/sq mm)
913 psi (6.2 N/sq) mm)
Maximum Downhole Temperature
400˚ F (205˚ C)
248˚ F (120˚ C)
Coefficient of Thermal Expansion
0.00005”/ft F (0.024 mm/m C)
0.000043”/ft F (0.020 mm/m C)
Water-Based Fluids
0.32
0.29
Oil-Based Fluids
0.28
0.23
Friction Coefficient:
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Special CoringTechniques Downhole Motor Coring Downhole motor coring is an option in situations where conventional coring tools cannot produce optimal results. These include:
• Highly-fractured formations where bit induced fracturing may occur • Hard rock formations • Horizontal wells • Horizontal re-entry applications • Multi-laterals • Crooked holes where string rotation would cause casing and drill pipe wear. A wide range of downhole motors is available for these difficult coring applications. This includes the latest generation of high power, improved reliability Navi-Drill™ Ultra Series motors. These motors have driven coring tools that cut 300 ft (90 m) cores in single coring runs.
Navi-Drill motor coring offers the following advantages: • Smooth torque to the core bit • Reduced weight on bit (WOB) • Reduced WOB-induced fracturing • Increased RPM and torque at the bit • Improved ROP. A special drop-ball sub must be used between the motor and core barrel to initiate coring. As an alternative to the sub, a DownholeActivated Flow Diverter can be positioned in the bearing assembly inside the core barrel. Special motors are available for coring with air, mist, or foam.
Navi-Drill Mach 1 Downhole Motor
Drop Ball Sub
Core Barrel
Best rotating speeds and torque values for your coring job can be selected from the various Navi-Drill motor configurations.
Core Bit
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Slimhole Coring Slimhole coring employs specialized hardware for holes ranging in size from 4⅛” to 4¾” in diameter. These hole sizes are too small for the smallest conventional 250P or heavy duty series core barrels.
The standard 350P slimhole barrel is a double-barrel swivel assembly similar to the 250P and HT Series except that it does not have a safety joint. Normally run with a mud motor, this 3½” x 1¾” x 30 ft (9.14 m) barrel can be used with rotary drill strings or with coiled tubing. The 3¾” x 2” Modular Coring System (M CS) incorporates an integral downhole motor to optimize ROP and minimize torque peaks.
DownholeActivatedFlowDiverter Our Downhole Activated Flow Diverter replaces a standard pressure relief plug in the coring assembly. By diverting drilling fluid flow through the inner barrel, this tool:
• Provides a positive seat for the drop ball • Reduces rig time used to drop and seat a standard relief ball • Allows flushing of inner barrels prior to coring when a standard ball cannot be dropped. The diverter tool can be used with motor coring assemblies in place of a drop-ball sub, and permits the running of MWD tools behind the core barrel.
Both barrelsminimize coring expenses and recover core samples of sufficient size for detailed analyses. CoreJ amIndicator Undetected core jamming is a common cause of poor core recovery. A Core Jam Indicator (CJI) is available to alert the operator that a jam has occurred. When activated, the CJI causes a predetermined increase in the standpipe pressure. This pressure increase indicates loading of the inner barrel and jamming conditions, allowing the coring engineer to pull out of hole before valuable formation samples are drilled through or lost. The CJI is an inexpensive and reliable method for detecting jams and avoiding lost core material. SM
Baker Hughes INTEQ Galileo coiled tubing unit is designed for efficient slimhole drilling and coring operations.
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Hydro-Lift™ Full Closure CoringSystem Many of the world’s producing formations are unconsolidated, friable, poorly cemented, or held together by viscous oil. Coring in these formations is difficult since the rock material lacks the strength to be recovered by conventional core catchers. The unconsolidated material typically disaggregates and falls through the standard catchers. In addition, these formations can be damaged by, or jammed off in, the standard core catcher.
Outer Core Barrel
Steel Sleve
The Hydro-Lift Full Closure Core Catcher eliminates problems associated with recovery of poorly consolidated core material. The system features the following advantages: • Slick, unobstructed core entry the core catcher is completely hidden by a smooth steel sleeve • Full closure catcher - a hydraulic mechanism lifts the steel sleeve to activate a clam shell assembly that completely seals the inner barrel • Backup Catcher - a backup spring type catcher captures consolidated core material. Slick core entry prevents both damage to the core material and jamming in the bit throat. The full closure catcher completely seals the barrel and captures poorly consolidated core material. For recovering unconsolidated core material, the system has proven extremely reliable. The Hydro-Lift core catcher also is used in fractured formations that are prone to jamming.
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Split Spring Full Closure Core Catcher
Coring Bit
Coring Mode
Retrieval Mode
Hydro-Lift full closure core catcher complet es a full line of Baker Hughes INTEQ conventional coring equipment that leads t he industry in reliability, flexibility, and low cost operation.
Hydro-Lift Capabilities Barrel
6-3/4” x 4”
8” x 4-3/4”
250P
X
X
HT30
X
HT40
The Hydro-Lift system can be used with aluminum and fiberglass inner barrels and can be fixed to both conventional and heavy duty core barrels.
X
Baker Hughes INTEQ Headquarters: 2001 Rankin Road, P.O. Box 670968, Houston, Texas 77267-0968, Tel: (713) 625-4200, Fax: (713) 625-5800 EasternHemisphereBusiness Unit: Wesgeco House, 455London Road, Isleworth, M iddlesex, England, UK TW7 5AB, Tel: (44) 0181 560-3160, Fax: (44) 0181 231-7127 WesternHemisphereBusiness Unit: 2001 Rankin Road, P.O. Box 670968, Houston, Texas 77267-0968, Tel: (713) 625-4200, Fax: (713) 625-5800
©1999Baker Hughes Incorporated. All rights reserved.
603-011 02/98
