Place of Application:                     Oil Field Korycany

Cleaning Technology:                   Downhole equipment cleaning (rod string and tubing) with DIR-X (during production)

                               

The well was cleaned three times per year from 2009 to 2021 to date

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Well Parameters

Well depth 1700 m, reservoir temperature 54°C, pump setting depth 1635 m, there was a problem with paraffin deposits

Standard paraffin cleaning (5 day workover / intervention): pull the rod pump and tubing out of the hole, cleaning with steam from paraffin / asphaltene at the surface, casing cleaning with scraper and hot oiling.

 

Cleaning Process

Heating up the downhole equipment during production

Mixture quantity: 7.2 m³

Cleaning time: 3.5 hours

Pump DIR-X down the annulus to heat up the entire 1635 meters of well downhole completion

 

Process: 

• dynamic fluid level at 1 300 – 1 350 m
• the well is in production
• pump DIR-X (7.2 m³) down the annulus
• the chemical reaction is divided into six time periods (24, 20, 16, 12, 6 and 2 minutes)
• after the reaction break (10 minutes) pump 20 m³ of oil down the annulus to wash the spent DIR-X with melted paraffin deposits out of the well into the tank at the well site

 

 

Result of Cleaning

Circulation pressure after cleaning was much lower. After 4 hours of well cleaning with DIR-X well production was restored to planned capacity and normal operation conditions in very short time and with lower costs.

Oil pumping did not have to be interrupted during the cleaning process with DIR-X system.

Well cleaning with DIR-X is currently performed three times per year. The run life – interval between interventions – was increased from 1 year to 4 years.