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- Improving well performance and integrity

SureFlo Chemical Injection Sub

SureFlo Chemical Injection Sub
SureFlo Chemical Injection Sub

Continuous, stable chemical injection with enhanced well integrity.


The reverse back-check valve is fully qualified as a barrier, providing a positive seal between the tubing and casing annulus.




Wells with scale or corrosion issues often require the continuous injection of treatment chemicals. The most common method employs the use of control lines to place the chemicals at the desired injection point in the well. Issues associated with the stable flow of chemicals through the control lines (no u-tubing), testing of control lines and well integrity have plagued the industry for decades.



Petroleum Technology Company’s SureFlo chemical injection sub has a unique design, which utilizes the barrier technology from the PTC’s SafeLift valve. The SureFlo sub facilitates testing of control lines, stable flow of chemicals (no u-tubing) and maintains well integrity. PTC’s Life of Field chemical injection design software can simulate the entire chemical injection system and determine the optimum control line size,

anti-u-tubing setting and control line test pressure.



SureFlo's true metal-to-metal seal has been qualified as a well barrier for operators worldwide. It was designed, built and tested in accordance to ISO 14310-V1/V0.




  • Anti U-tubing system
  • Barrier qualified back check valves
  • True metal-to-metal back check seals
  • In-line filter, and chemical injection line testing system




  • Field proven design and operation
  • Best in class reliability and longevity ensure enhanced productivity and well integrity




AISI 410S, 420M, 25%Cr, S13%Cr, Alloy 718
Maximum O.D.  7.5"        8.0"        9.2"
Minimal I.D. 3.867"    4.778"    6.102"
Tubing Thread

4 1/2" or 5 1/2" Box Pin*

*Threads and tubing weight based on customer request

Body Opearting Pressure psi [Mpa]  

5 000-10 000 [34.5-69]*

*Based on the base material

Operating Temperature °F [°C] 64.4-329 [18-165]
Elastomer on Shear-out Device FKM
Bypass for Control Lines 1 X 11mm X 11mm
1 X 11mm X 22mm
1 X 11mm X 36mm
(other dimensions up to 6 on request)
Control Line Connection 1/4" or 3/8" Jam Nut Connection
Valve Type Dual Check
Valve Primary Seal Metal to Metal
Valve Material Alloy 718
Back Check Valve Maximum Operating Pressure Psi [Mpa]   10 000 [69]
U-tube Valve Crack Open Preassure psi [Mpa]   50- 5.000 [0.34-34.5]
Maximum Injection Rate gal/hr* [liter/hr] 13.2 [50]  
Applicable Standards API 19G2-V1, TR2385 - 20cc/15min (0cc/15min)



Life of Field Chemical Injection

PTC has developed a unique Chemical Injection well design work-flow, which employs a combination of proprietary and industry recognized software tools. These tools cater for uncertainties and changes in key parameters over the life of the well. PTC’s design tools provide operators with all the information they require, to make the best Chemical Injection design selection decisions.


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