dst brochure

Drillstem Testing Tools

2 © 2009 Weatherford. All rights reserved.


Weatherford’s drillstem testing (DST) tools are a cost-effective way to evaluate potentially productive zones before committing expensive completion equipment to the well. Run on the drillstring, DST tools isolate the zone of interest and gather data and samples for analysis, saving rig time and enabling you to make informed well-design and reservoir-development decisions.

A DST string is, in essence, a temporary completion that tests how the well will perform when subjected to various flow conditions. The resulting data are analyzed to determine formation parameters and reservoir characteristics.

A DST evaluation can determine

reservoir pressure and inflow performance relationship; •

reservoir properties such as porosity, permeability, transmissibility, and • skin factor;

radius of investigation and reservoir boundary conditions;•

production potential and reserve estimates.•

Our highly trained technicians will work with you to design a DST string that will give you accurate reservoir measurements, even under the most hostile conditions, to increase your confidence in reservoir characterization and, ultimately, increase reserves recovery.

DST is only one element of Weatherford’s evaluation offering. We have a full range of technologies for formation evaluation and characterization, production logging, and cement and casing evaluation.

Discover Premium Performance

Contents

Full-Bore DST Assembly ....................... 3

Assembly ComponentsFull-Bore Tester Valve ......................... 4Full-Bore Circulating Valve ................. 6Full-Bore EXIT Valve .......................... 7Full-Bore Combination Tool ................ 8HD Compression-Set Production Packer .............................. 9Full-Bore Tension Safety Joint ............11Full-Bore Expansion Joint ...................12

Customized Field Service Skids ..........13

The Weatherford Portfolio ....................14

Enterprise Excellence Program ...........15

3© 2009 Weatherford. All rights reserved.


Full-Bore DST Assembly

Operating EnvelopeOD 5.000 in.

127.0 mm3.125 in. 79.4 mm

ID 2.250 in. 57.2 mm

1.125 in. 28.6 mm

Temperature –22° to 350°F –30° to 177°C

Sour service H2S and CO2

Maximum hydrostatic pressure 17,500 psi 121 MPa

Maximum differential pressure

Against closed ball 15,000 psi 103 MPa

Across ball when opening 7,000 psi 48 MPa

Maximum differential pressure (annular/tubular) when opening

12,000 psi 83 MPa



Weatherford’s full-bore tester valve (FBTV) is a spring-loaded ball valve designed to be opened and closed over multiple cycles with application of annulus pressure. The FBTV is run above a packer during drillstem testing (DST) or perforating operations. The alternating opening and closing of the FBTV enables repeated formation pressure testing and sampling of the formation fluids.

The FBTV is run with both nitrogen (N2) pressure and compression spring force to hold the ball valve in the locked open or closed position. The weight of the tool string keeps the circulating sleeve extended and keeps the hydrostatic referencing ports open to annulus pressure. As the tool travels downhole, the increasing annulus pressure passes through the hydrostatic referencing ports and applies force to the bottom of the N2 balance piston, forcing it upward. The upward movement of the N2 balance piston equalizes the N2 chamber pressure to the hydrostatic pressure.

The hydrostatic pressure also passes through activation ports on the top side of the upper piston, forcing the valve downward. Because the upper and lower pistons have the same cross-sectional area, the ball valve stays balanced. Therefore, the main force holding the ball valve in the closed or locked open position is the compression spring force.

When the FBTV is at depth, the packer is set, and the tool string is put in compression. This action closes the referencing ports, locking the current hydrostatic pressure inside the tool below the lower piston. This feature allows the ball valve to be cycled through four J sleeve positions with application and release of annulus pressure.

Full-Bore Tester Valve

For example, starting in the closed position, the ball valve can be cycled as follows:

1. To move the ball valve to the open position, apply annulus pressure.

2. To move the ball valve to the locked open position, release the applied annulus pressure.

3. To move the ball valve to the safe open position, apply annulus pressure.

4. To return the ball valve to the closed position, release the applied annulus pressure.



The applied annulus pressure should be high enough to overcome the load of the compression spring (500 to 1,500 psi [3.44 to 10.34 MPa]) plus an additional 300 psi (2.06 MPa) to cycle the ball valve. Opening the FBTV under differential pressure requires an additional 250 psi (1.72 MPa) for every 1,000 psi (6.89 MPa) of differential pressure across the ball. The FBTV is rated up to 15,000 psi (103.42 MPa) hydrostatic working pressure and 11,000 psi (75.84 MPa) maximum differential pressure.

When DST operations are complete, and the tool string is picked up, the referencing ports are again exposed to the hydrostatic pressure at depth, allowing the tool to be safely tripped out of the hole after the packer is released.

Specifications

Maximum hydrostatic pressure (psi/MPa) 17,500 120.66

Working pressure (psi/MPa) 15,000 103.42

Temperature (°F/°C) –22° to 350° –30° to 177°

OD (in./mm) 5.00 127.0

3.125 79.375

ID (in./mm) 2.25 57.15

1.125 28.575

Maximum differential pressure against ball (psi/Mpa) 15,000 103.42

Maximum differential pressure against ball when opening (psi/MPa) 7,000 48.26

Maximum differential pressure (annulus/tubular) when operating (psi/MPa) 12,500 86.18

Features, Advantages and BenefitsThe FBTV is designed to be opened and closed over multiple cycles with • application of annulus pressure, providing flexibility during DST and perforating operations.

The upper and lower pistons balance the ball valve, making it insensitive to • tubing pressure changes and reducing the applied annulus pressure required to cycle the valve.

The full-bore ID of the valve eliminates flow restrictions and allows maximum • production rates.

Splined construction allows torque to be transmitted through the tool so that • other torque-operated tools may be run in the hole.

The capability to adjust the compression spring force allows the FBTV to be • used in applications in which other annulus pressure-operated tools may be run in the hole.

Cased-hole DST• Perforating operations•

Applications



Indexing mandrel

Guide sleeve

Annular circulation port

Reverse circulation port

Weatherford’s FBCV is actuated by cycling the internal tubing pressure, making • its operation completely independent of tools actuated by annular pressure.

The full-bore ID of the circulating valve matches the tubing ID, eliminating flow • restrictions and allowing maximum production and recirculation rates.

The ability to reset the FBCV after a number of predetermined pressure cycles • allows the tool to be used for subsequent testing programs, saving the expense of pulling the test string and redressing the tool.

Features, Advantages and Benefits

Weatherford’s full-bore circulating valve (FBCV) is an unlimited-multiple-cycle, differential-pressure-activated valve that provides a means of communication between the test string and the annulus during cased-hole well testing and shoot-and-pull operations.

Once the optional shear pins have been sheared with applied pressure, operation of the tool is controlled by differential pressure applications between the tubing and the annulus. A predetermined number of these differential pressure cycles moves an internal mandrel that is controlled by a circumferential automatic jay mechanism. The first opening is into the reverse position, then into the circulation position, and finally back into closed position, for the required cycles of the auto jay.

Full-Bore Circulating Valve (FBCV)

SpecificationsAssembly part number 459214

Differential and hydrostatic working pressure (psi/MPa) 15,000 103.4

Maximum working temperature with sour service trim dynamics (°F/°C)

350° 177°

Differential Pressure activated

OD (in./mm) 5.0 127.0

ID (in./mm) 2.25 57.2

Connections 3 1/2-in. IF threaded box × pin

Tensile rating (lb) 350,000

Tool length (ft/m) 8 2.5

Weight (lb/kg) 600 272



Weatherford’s full-bore EXIT valve is a single-function sleeve valve that is controlled by annulus pressure. The tool can be used at the end of simple cased-hole testing and perforating operations when circulation from the tubing to the annulus is necessary. The EXIT valve is run in the open position, and it is fully balanced to the tubing pressure. The tool is designed to open when sufficient pressure is applied to the annulus, and the valve will remain open.

The operation of the EXIT valve is controlled by a rupture disk and sliding shear sleeve, which is held in the closed position by shear pins. The rupture disk is selected so that the EXIT valve has the highest operating pressure of any tool in the string. The annulus hydrostatic pressure is calculated at packer depth before running the EXIT valve to ensure correct selection of the rupture disk. The activation pressure of the sliding sleeve is determined by using 2 to 24 shear pins, each with a nominal rating of 800 psi (5.51 MPa) at 72°F (22°C).

When sufficient annulus pressure is applied to burst the rupture disk, the pressure forces the sliding sleeve downward to shear the pins and expose the circulating ports, enabling circulation between the tubing and annulus. As the sleeve moves farther, a ratchet lock ring engages, preventing the sleeve from closing.

Full-Bore EXIT Valve

Features, Advantages and BenefitsOperation of the EXIT valve is controlled by applying pressure to the annulus, • allowing simple operation of the valve without rotating the tubing.

The ability to control the activation pressure of the sliding sleeve using shear • pins prevents the valve from opening if the rupture disk prematurely bursts.

The ratchet lock ring prevents the sleeve from closing to ensure reliable • operation of the valve.

The full-bore ID of the valve eliminates flow restrictions, allowing maximum • production rates.

Specifications

Part NumberOD

(in./mm)ID

(in./mm)

463252 5 127.0

2.25 57.2

5075 Fullbore Exit



Specifications

Tool Size (in./mm)

Minimum ID

(in./mm)Valve

Configuration

Upper Thread

Connection (in.)

Lower Thread

Connection (in.)

Temperature Rating (°F/°C)

Tensile Rating (lbf/kN)

Maximum Hydrostatic

Rating (psi/kPa)

Maximum Port

Opening Differential (psi/kPa)

Maximum Ball

Opening Differential (psi/kPa)

Assembly Part

Number

5 127.0

2.25 57.150

Ball valve with circulating valve

3-1/2 API IF box

3-1/2 API IF pin

–22° to 350° –30° to 180°

350,000 1,557

15,000 103,400

7,000 48,200

7,000 48,200

00760932

Ball valve only 00761159

Circulating valve only 00761161

Weatherford’s full-bore combination tool (FBCT) is an annulus-pressure-operated ball valve and circulating valve that enables communication between the annulus and tubing. The FBCT is typically run into the hole with the ball valve open and the circulating valve ports closed. At the target depth, annulus pressure is applied to close the ball valve, open the circulating valve flow ports, and subsequently return the valves to their original position. This tool is designed so that the ball and circulating valves can be run together as a unit or split apart and run individually.

The tool’s single-cycle operation is controlled by three rupture disks that are exposed to annulus pressure and set to burst at least 500 psi (3.44 MPa) apart. When the annulus pressure is increased to burst the first rupture disk, the ball valve closes. When the pressure is increased again to burst the second rupture disk, the sleeve in the circulating valve shifts to open the ports, enabling flow between the annulus and the tubing. When the pressure is increased a final time to burst the third rupture disk, the circulating valve ports close and the ball valve opens, returning the tool to its original position.

The FBCT can be configured in various ways. The ball valve can be initially set in the open or closed position. The circulating valve can be set to start closed, shift open, and then close again. Alternatively, the circulating valve can start in the open position and then cycle closed. Operation of the FBCT is insensitive to tubing pressure changes when the flow ports are closed. The tool can operate up to 15,000 psi (103.42 MPa) differential pressure.

Fluid circulation• Pressure testing• Well testing•

Applications

Features, Advantages and BenefitsThe combination tool can be run in different configurations and operating • conditions, allowing it to be adapted for a variety of applications.

The ball valve and circulating valve can be run together as a unit or run • individually, allowing each valve to be used in a different application.

The full-bore ID enables maximum flow rate, permitting passage of wireline tools.•

Full-Bore Combination Tool



The carbide slip and buttons improve durability and enable setting in • high-grade casing.

A one-quarter turn sets the packer, and a pickup unsets it, simplifying operation • on the rig.

The large-diameter holddown buttons help protect against casing damage.• The heavy-duty mandrel supports high hang-off weights, and its full bore • enables the easy passage of wireline tools and maximum pump rates.


General service• Squeeze cementing• Testing and treating• Cased-hole production testing•

Applications

Weatherford’s HD compression-set retrievable service packer isolates the annulus from the production conduit for general service. The packer can be run with a mechanically set bridge plug to straddle intervals.

The internal bypass provides circulation around the packer and faster trips with less swabbing. Hydraulically operated upper holddown buttons anchor the packer against high differential pressure from below. Backup rings on all O-rings provide reliable sealing at high temperatures and pressures. An internal unloader enables circulation below the buttons, easing packer retrieval.

HD Compression-Set Production Packer

The packer is available with a left-turn set, automatic release jay and other • elastomers for hostile environmets.

Options



SpecificationsCasing Packer*

OD (in./mm)

Weight (lb/ft, kg/m)

ID (in./mm) Maximum

OD (in./mm)

Minimum ID

(in./mm)

Standard Thread Connection

(in.) ProductMinimum Maximum

4 101.6

9.5 to 11.0 14.1 to 16.4

3.476 88.29

3.548 90.12

3.318 84.28

1.485 37.72 1.900 EU 10 RD 613-40-0C0

4-1/2 114.3

9.5 to 13.5 14.1 to 20.1

3.920 99.57

4.090 103.89

3.755 95.38

1.485 37.72 2-3/8 EU 8 RD 613-45-0C0

5 127.0

11.5 to 15.0 17.1 to 22.3

4.408 111.96

4.560 115.82

4.130 104.90

1.860 47.24 2-3/8 EU 8 RD 613-50-0C0

5-1/2 139.7

14.0 to 17.0 20.8 to 25.3

4.892 124.26

5.012 101.90

4.630 117.60 1.923

48.84 2-3/8 EU 8 RD613-55-0C0

20.0 to 23.0 29.8 to 34.2

4.670 118.62

4.778 121.36

4.505 114.43 613-57-0C0

6-5/8 168.3

28.0 to 35.0 41.7 to 52.1

5.595 142.11

5.791 147.09

5.380 136.65

2.485 63.12 2-7/8 EU 8 RD 613-67-0C0

7 177.8

17.0 to 26.0 25.3 to 38.7

6.276 159.41

6.538 166.07

6.125 155.58 2.485

63.12 2-7/8 EU 8 RD613-72-0C0

26.0 to 32.0 38.7 to 47.6

6.094 154.79

6.276 159.41

5.880 149.35 613-70-0C0

7-5/8 193.7

24.0 to 29.7 35.7 to 44.2

6.875 174.63

7.025 178.44

6.693 170.00 2.485

63.12 2-7/8 EU 8 RD613-76-0C0

33.7 to 39.0 50.2 to 58.0

6.625 168.28

6.765 171.83

6.458 164.03 613-75-0C0

9-5/8 244.5

43.5 to 53.5 64.7 to 79.6

8.535 216.79

8.755 222.38

8.255 209.68

3.985 101.22 4-1/2 EU 8 RD 613-95-0C0

*The standard packer has carbide slips, a right-turn set automatic release jay, and 90-70-90 nitrile elastomers.

HD Compression-Set Production Packer (continued)



SpecificationsAssembly part number FBTJ

Differential working pressure (psi/MPa) 15,000 103.4Hydrostatic working pressure (psi/MPa)

Maximum working temperature (°F/°C) 350° 177°

OD (in./mm) 5 127

ID (in./mm) 2.25 57.15

Connection (in./mm) 3-1/2 IF threaded box × pin

Weatherford’s full-bore tension safety joint (FBTJ) is a two-stage disconnect tool that is run above the packer to allow the tubing to be disconnected from the tool string, when necessary.

In the first stage of disconnection, a predetermined tensile load is applied from the surface to sever the shear ring assembly. The shear tensile load is dependent on specific requirements and can range from 4,000 to 66,000 lb (1,814 to 29,937 kg), including the weight of the test string below the FBTJ.

The second stage of disconnection requires application of right-hand torque to the tubing while simultaneously stroking the tubing upward and downward approximately 9 in. (23 cm). This sequence is repeated for approximately six revolutions, with two upward strokes per revolution, until the tool disconnects. The inner mandrel of the tool is indexed to both the splined housing and the release nut. Rotating the tubing to the right indexes the left-hand-threaded release nut, thereby unscrewing it from the body and separating the tool.

In the unlikely event that the shear pin assembly is severed unintentionally during operations, the tool will not separate unless right-hand torque and vertical stroking are applied.

Retrieval of downhole equipment in the event the tubing string has become • stuck in the wellbore

Applications

Features, Advantages and BenefitsThe design of the FBTJ enables retrieval of any tubing and tools above the • disconnect should the tubing string become stuck in the wellbore.

The left-handed release nut prevents separation of the packer if the shear ring • assembly is severed unintentionally, avoiding possible damage to the tool string and wellbore.

The full-bore ID of the safety joint allows maximum production rates and permits • the passage of wireline equipment.

Full-Bore Tension Safety Joint

5074 Fullbore Tension



Torque spline

Primary seals

Tubing piston chamber

Primary seals

Annular piston chamber

Primary seals

Annular and tubing piston areas balance pressure and volume, which • eliminates axial loading caused by internal or external pressure, and prevents volume and pressure changes in the annulus and tubing as the tool reciprocates.

The full-bore ID of the expansion joint eliminates flow restrictions and • allows maximum production rates.


Weatherford’s full-bore expansion joint (FBEJ) compensates for expansion and contraction of the test string during downhole testing. Because the test string is fixed at the top end by a hanger or slick joint and at the bottom end by a packer, downhole temperature and pressure variations can create axial loading that changes the test string’s length. This loading can lead to buckling, fracture, or packer displacement.

To compensate for these varying environmental conditions, the FBEJ uses annular and tubing piston areas to balance pressure and volume. This eliminates any axial loading on the tool due to internal or external pressure variations, and prevents a change in the volume or pressure of the annulus or tubing as the tool reciprocates.

The number of expansion joints required in a test string depends on the test program and well conditions. The expansion joint is positioned in the test string between the hanger of the slick joint in the blowout preventer (BOP) and the packer.

Full-Bore Expansion Joint (FBEJ)

Specifications

Assembly part number 1770000

Differential and hydrostatic working pressure (psi/MPa) 15,000 103.4

Maximum working temperature (°F/°C) 350° 177°

Volume and pressure balanced with sour service trim dynamics

Stroke length (ft/m) 5.0 1.5

Extended length (ft/m) 27.0 8.2

Closed length (ft/m) 22.0 6.7

OD × ID (in./mm) 5 × 2.25 127.0 × 57.2

Connections 3-1/2 in. IF threaded box × pin

Tensile rating (lb) 350,000

Weight (lb/kg) 1,200 544



15,000-psi (103-MPa) Test UnitSC Model 10-5000W005 low-pressure pneumatic fill pump, for water service, • designed to stall at 1,000 psi (7 MPa) discharge pressure

SC Model 10-5-100W high-pressure pneumatic pump, for water service, rated • for 15,000 psi (103 MPa) discharge pressure

Baird 780-7801-1 relief valve, 16,000 psi (110 MPa) set pressure•

Hydroplex CV20-7AHP check valve•

Common air inlet with ARO FRL and pump silencers on air exhaust ports•

Interconnecting tubing and fittings, aluminum enclosure with gauges and valves • on panel, common fluid inlet on panel, fluid discharge port on rear of unit

Customized Field Service Skids

Intensifier UnitSC Model GBD-75 nitrogen • intensifer

Mounted in aluminum enclosure, • includes single-inlet port for nitrogen bottle with regulator and interconnecting tubing to channel nitrogen to inlet of pump and air motor inlet, rated for pressures up to 8,000 psi (55 MPa)

SkidAluminum skid with headache rack•

Four-point lift and forklift slots•

Nitrogen bottle rack•

Toolbox•



Weatherford International Ltd. is one of the largest global providers of innovative mechanical solutions, technology and services for the drilling and production sectors of the oil and gas industry. An industry leader for more than 55 years, Weatherford has built its reputation by providing high-quality products, responsive client service, and a commitment to safety in all aspects of operations. Our continued pledge to our clients is to provide production-enabling technologies and superior services that maximize production. Our vast global infrastructure enables us to offer one of the industry’s most diversified portfolios of products and services for drilling, intervention, completion and production applications.

Since 1998, Weatherford has strategically combined an array of well-known brands from the completions sector with one goal in mind: making your reservoir recovery operations more productive.

Engineering DepthWeatherford’s product engineering resources are based around the world. We also employ a staff of engineers, designers and technical support staff whose breadth and depth of experience ranges from mechanical and electrical engineering to highly specialized disciplines of optical science and metallurgy.

Industry-leading Testing, R&D and Training FacilitiesWeatherford has two of the largest research-and-development (R&D), testing and training facilities in the industry. Our Houston-based Technology & Training Center houses the world’s most advanced safety valve engineering lab and three hot cells that simulate downhole conditions. Our Aberdeen facility is Europe’s foremost research, testing and development center for offshore well services. This facility includes two fully operational drilling rigs and test boreholes.

Manufacturing InfrastructureWeatherford’s certified manufacturing facilities are strategically located throughout the world. Since 2002, we have doubled our completions manufacturing capacity by adding new facilities, expanding existing ones, and investing significantly in the latest machining equipment.

The Weatherford Portfolio



Weatherford has created a culture focused on prevention to achieve error-free performance and empowerment of all employees to achieve continuous improvement in all work processes.

Our Enterprise Excellence Program describes how we will

comply with all applicable laws and regulations of the areas where we operate • or exceed compliance where our stated expectations require;

conduct all operations in a way that promotes safe work practices and minimizes • risk to our employees, our communities and the environment;

implement the programs, training and internal controls necessary for achieving • our goals.

Our enterprise culture has one objective and a single commitment: We empower each employee to achieve complete internal and external client satisfaction and to conform to mutually agreed requirements the first time, every time, while protecting the well-being of all personnel, assets and the environment.

For our clients, our excellence culture results in advantages such as greater efficiency through more effective planning and collaboration to ensure that mutually agreed requirements are being met and the elimination of nonconformance in the delivery of products and services, assuming both technical integrity and safe work practices.

Enterprise Excellence Program


Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.

© 2009 Weatherford. All rights reserved. Brochure 5248.00

515 Post Oak Blvd., Suite 600Houston, Texas 77027 USATel: 713-693-4000weatherford.com

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