HS-7030
Winterized H2S Scavenger
What is it?
HS-7030 a 42% Winterized MEA Triazene H2S Scavenger. This product is an in-house blend as GeoChemicals manufactures all our own products. If treated in an aqueous phase, scale inhibitor is added to make product HS -7030CA.
Applications
backside continuous treatment
This is a newer concept and will not work in all cases. Specially formulated scavengers can be pumped down the back side using a side stream flush to continuously treat H2S in all three phases assisting in FeS (iron sulfide) precipitation. This is most commonly used if oil is penalized for being sour.
Static Mixer
As gas leaves the separator it is fed to the inlet of a horizontal vessel with scavenger and inner shelves. The gas is fed through the scavenger and then slammed into the shelves causing a mixing effect allowing mass transfer to occur and most efficiently scavenging H2S. Some of the Scavenger will leave the vessel with the gas so a continuous refill tank is set feeding fresh scavenger into the vessel.
Gas Line Continuous Treatment
This application can be used in low velocity gas environments. The goal is to continuously treat in the gas phase after the separator via atomizer. This would remove the need for contact towers and have no bi product of over spent H2S Scavenger.
Bubble tower
This is a vertical tower that is filled with methanol and blended triazene. A calculation will be made on the life of the scavenger has gas passes through the fluid. Once a tower is close to the end of its predicted life cycle, testing will begin, and a date will be set to remove the spent chemical and refill with fresh chemical.
Case Study
Gas Phase Testing
GeoChemicals was given the opportunity to scavenge H2S for an oil and gas producer via side stream flush to the well bore and surface atomizer in the gas phase. Gas was dropped into spec for sale several times throughout the trial while assisting with phase separation and solids mitigation as scavenging down hole assisted with FeS (iron sulfide) precipitation.
Lab testing
Oil Phase Application
HS-7030 was tested against high amounts of H2S in a timed scavenging study to ensure its efficiency for field use. HS-7030 proves to be effective against high doses of H2S, giving the potential for good run times in bubble tower conditions.
Testing Parameters
Bottles were premeasured and marked to have 400ml of 3 phase emulsion. After being marked bottles were pre-dosed with 1000, 2000, 3000, and 4000 ppm of scavenger. Initial testing included lower dosing but concluded anything under 1000 ppm shows to be unsuccessful in a one-minute time window. With time and agitation, some doses under 1000 were successful against the H2S levels present in each sample. This indicates that treatment volumes may vary depending on application type.
After pre-dosing, each bottle is filled to equal 400 ml and compared to the blank test bottle. Bottles are agitated and then tested in a time-frequency to identify the lowest effective dosing at what time of interaction and agitation. This is in accordance with ASTM tests methods for H2S.
Scavenger was collected, micropipette and stain detection tubes were put into place for immediate time-sensitive test results.
Sample 1 - Blank of 5000 PPM
Dropped to 0 with a dosing of 500 PPM scavenger in one hour.
Sample 2 - Blank of 2000 PPM
Dropped to 0 with a dosing of 500ppm scavenger in one hour.
Sample 3 - Blank of 2000 PPM
Dropped to 50 PPM with 100 PPM scavenger in one hour.
Summary
HS-7030 is an effective triazine-based H2S scavenger designed to remove H2S from downhole and natural gas streams. It is generally applied downhole, in lead lines, and bubble towers and can be used with or without static mixers.