+3 votes
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Scale inhibitor squeeze experience?

asked Mar 26, 2014 in Subsea by Normandy (21,040 points)
Can someone share any scale inhibitor squeeze experiences?

I am investigating the potential of produced-water and seawater injection for a field and suspecting baryum sulfate (BaSO4) scaling may become an issue at the producing wells.

2 Answers

+2 votes
answered Apr 14, 2014 by judyp (2,700 points) | selected Apr 14, 2014 by Normandy
 
Best answer

The scale squeeze treatments have been applied by use of "bullhead treatment" where the scale inhibitor is mixed with the injection water and bullheaded into the well. The well is then closed in for a 6 hours soaking period. 

Following the soaking period, the well is then put on production and the scale inhibitor is slowly being produced out of the well with the produced water. 

The scale inhibitors performance/efficiency is then monitored in terms of residual scale inhibitor concentration in order not to reach the minimum inhibitor concentration where limited inhibition occurs and where a high potential for scale precipitation exists. Furthermore, ion analysis and ESEM are conducted in conjunction with the RSI analysis in order to assess and evaluate the scale mitigation/development in the well.

Sometimes it is necessary to conduct several scale squeeze treatments on a well in order to prevent further BaSO4 scale precipitation. 

Caliper surveys are conducted prior and following the scale squeeze treatments in order to evaluate the efficiency of the scale inhibitor (scale precipitation and corrosion development).

 

+4 votes
answered Mar 27, 2014 by ekwuemesam (3,660 points)

Chemical suppliers like Champion Technologies and Clariant have several scale inhibitors targeting BaSO4 scale for squeeze applications.

It is essential to conduct a static adsorption test and coreflood study in order not to cause any reservoir impairment when conducting the scale squeeze treatments.

Furthermore, ensure that corrositivity of the tubing material and elastomer compatibility have been conducted prior to application of the scale inhibitor.

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