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NAKASAWA Mining & Energy, LTD | EOR Thermal Processes | Energy Industry |
nakasawaresources.com
2020 Nakasawa Mining & Energy. All Rights Reserved
VACUUM INSULATED TUBING
NK-VIT
NK-VIT Vacuum Insulated Tubing
designed and manufactured by
Nakasawa, provides a technical
solution to today's well completion
challenges. Our NK-VIT product
line consists of specific models
optimized for different types of
thermal completions.
NK-VIT consists of a concentric
tubes set (outer and inner tube),
which have a high vacuum
atmosphere that is achieved mechanically and chemically by vacuum pumps to activate the Hydrogen and Gases
Getter until reaching the pressure of absolute zero, mitigating heat losses in the annular space between both tubes.
Additionally, NK-VIT has multi-layer insulation (Silica,
Ceramic, Fiberglass and Aluminum diffusing barriers)
that eliminate convective heat transfer and reduce the
conduction and radiation effect, maintaining a high
quality steam injection.
The inner tube is pre-stressed in order to compensate
the elongation between both tubes, and it is welded
to outer tube (Double weld). Supersonic,
Radiographic, and Magnetic Particle Inspection
(Magnaflux) Tests are performed to ensure the
integrity of all connections, joints, and welds.
“NK-VIT protects the integrity of all elements and
increases overall well-bore stability, while improving
steam delivery performance to the reservoir”
“Delivery of High Steam Quality at downhole”
Thermal Insulation Layers
NAKASAWA Mining & Energy, LTD | EOR Thermal Processes | Energy Industry |
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2020 Nakasawa Mining & Energy. All Rights Reserved
ADVANTAGES AND APPLICATION OF NK-VIT IN THERMAL PROCESSES:
Reduces heat loss ensuring optimal steam quality being injected into the oil formation.
Prevent excessive heat transfer into the
near-wellbore area.
Minimizes heat stress on well casing and cement mantle.
Injection of superheated steam (at 680 °F)
or hot water into the reservoir in order to heat high-viscosity oils.
Decreases unwanted annulus pressure. Prevent deposition of asphalts, resins and
paraffin.
Improves well life cycle cost and avoids failure due to well integrity issues (Improvement of tubing runlife: 3 to 5 injection cycles).
Optimization of Steam Stimulation Cycles
(Reduction of injection times).
Important technology for the economic production of deeper heavy oil fields (+ 6000 feet deep). During production pump efficiency will be improved.
Applicable to Heavy Oil Production through Cyclic Steam Stimulation, such as: CSS, Steam Flooding, SAGD, SW-SAGD, HASD, In-Situ Combustion).
MANUFACTURING PROCESS AND PREMIUM
CONNECTIONS:
The manufacturing process is carried out in accordance with API 5CT and ISO standards (Last Edition), meets and exceeds the technical specifications required by clients.
Our Engineering & Design Team is continually developing product innovations regarding vacuum / insulation properties and client specific needs, including connection technology (API Buttress, semi-premium and premium connections). Nakasawa also manufacture insulated crossovers (different sizes), and Pup-joints with special connections.
Our NK-VIT Connections are fully interchangeable with many Premium Threads, such as: JFEBER, VAM TOP, FOX, CS-Hydrill, among others. The connection can be manufactured as a flush or semi-flush joint (in the outer or inner tube), which is used in thermal tubes of different diameters.
NK-VIT Connection design provides 100% of resistance and tensile efficiency for the couplings. Robustness, high torque capability, compression strength are its main features. High structural performance allows high compression and tension strength in deviated holes without affecting thread integrity.
Connection Performance Envelope
“All our products are manufactured under
strict high quality standards”
NAKASAWA Mining & Energy, LTD | EOR Thermal Processes | Energy Industry |
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2020 Nakasawa Mining & Energy. All Rights Reserved
NK-VIT BASIC DESIGN (VACUUM THERMAL INSULATION):
Reference: NK-VIT Design for 4-½” x 2-⅞” Size.
K FACTOR (QA/QC SYSTEM) AND INSULATION
GRADE:
Each VIT joint is tested for insulation.
The apparent K-Factor is verified by the use of a fully
automated testing system using an integrated
heating element inside the inner tube at 350°C while
the outer tube is monitored by a sensor.
The data from the K-Factor test is verified, collected
and stored in a customized computer system.
K values and Insulation Grades
INSULATION AT THE COUPLING (PTFE):
The vacuum sleeve manufacture by Nakasawa has a
main component, Polytetrafluoroethylene (PTFE),
which resist high temperature (upto 680°F) and
provide stability to the steam injection process.
Coupling with vacuum sleeve provides better
insulation; the tests performed using this type of
insulation on connections between joints describe
low heating loss or null heat transfer from inside of
VIT to its external side (annular space).
Temperature Sensor
Heating Bar
NAKASAWA Mining & Energy, LTD | EOR Thermal Processes | Energy Industry |
nakasawaresources.com
2020 Nakasawa Mining & Energy. All Rights Reserved
NK-VIT PRODUCTS SPECIFICATIONS (AVAILABLE SIZES):
Note: Vacuum sleeves (PTFE) are provided with each VIT joint.
OD. (in) W.T mm Weight (lb/ft) Grade OD. (in) W.T mm Weight (lb/ft) Grade
7" x 5-½" 7 0.317 23 N80 / L80 / 13Cr 5-½ 0.304 17 J55 / N80/ L80 / 13Cr
7" x 5" 7 0.362 26 N80 / L80 / 13Cr 5 0.296 15 J55 / N80/ L80 / 13Cr
5-½" x 4" 5-½ 0.361 20 N80 / L80 / 13Cr 4 0.226 9.5 J55 / N80/ L80 / 13Cr
5-½" x 3-½" 5-½ 0.361 20 N80 / L80 / 13Cr 3-½ 0.254 9.2 J55 / N80/ L80 / 13Cr
5" x 3-½" 5 0.296 15 N80 / L80 / 13Cr 3-½ 0.254 9.2 J55 / N80/ L80 / 13Cr
4-½" x 3-½" 4-½ 0.271 12.6 N80 / L80 / 13Cr 3-½ 0.254 9.2 J55 / N80/ L80 / 13Cr
4-½" x 2-⅞" 4-½ 0.271 12.6 N80 / L80 / 13Cr 2-⅞ 0.217 6.4 J55 / N80/ L80 / 13Cr
4-½" x 3-½" 4-½ 0.250 11.6 N80 / L80 / 13Cr 3-½ 0.254 9.2 J55 / N80/ L80 / 13Cr
4-½" x 2-⅞" 4-½ 0.250 11.6 N80 / L80 / 13Cr 2-⅞ 0.217 6.4 J55 / N80/ L80 / 13Cr
4" x 2-⅞" 4 0.226 9.5 N80 / L80 / 13Cr 2-⅞ 0.217 6.4 J55 / N80/ L80 / 13Cr
4" x 2-⅜" 4 0.226 9.5 N80 / L80 / 13Cr 2-⅜ 0.190 4.6 J55 / N80/ L80 / 13Cr
3-½" x 2-⅜" 3-½ 0.216 7.7 N80 / L80 / 13Cr 2-⅜ 0.190 4.6 J55 / N80/ L80 / 13Cr
3-½" x 2-⅜" 3-½ 0.254 9.2 N80 / L80 / 13Cr 2-⅜ 0.190 4.6 J55 / N80/ L80 / 13Cr
2-⅞" х 2-⅟16 " 2-⅞ 0.217 6.4 N80 / L80 / 13Cr 2-⅟16" 0.153 3,6 J55 / N80/ L80 / 13Cr
BASIC SPECIFICATIONS
VIT SizeEXTERNAL PIPE INTERNAL PIPE
Qty. Material
7" x 5-½" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
7" x 5" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
5-½" x 4" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
5-½" x 3-½" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
5" x 3-½" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4-½" x 3-½" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4-½" x 2-⅞" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4-½" x 3-½" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4-½" x 2-⅞" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4" x 2-⅞" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
4" x 2-⅜" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
3-½" x 2-⅜" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
3-½" x 2-⅜" 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
2-⅞" х 2-⅟16 " 30 - 32" / 9,75 mtrs API or Premium 0.0115586 - 0.00346758 0.002 ≤ λ < 0.017 680 °F / 3000 Psi 8 to 10 Aluminum / Fiberglass / Ceramic
OTHER SPECIFICATIONS
VIT SizeMulti-Layers InsulatingPressure &
Temperature Range
Thermal Conductivity
at 360°C (λ: W/m.°C )
K Factor
(BTU / Hr.Ft.°F)Connection
Length
(Ft / mtrs)
NAKASAWA Mining & Energy, LTD | EOR Thermal Processes | Energy Industry |
nakasawaresources.com
2020 Nakasawa Mining & Energy. All Rights Reserved
For further information, please contact one of our representatives:
2020 Nakasawa Mining & Energy. All Rights Reserved.
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