METHOD OF PREVENTION OF SALT DEPOSITION ON OIL PRODUCTION EQUIPMENT Russian patent published in 2015 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: reagent amount is regulated at wellhead by an electric metering pump unit connected to capillary pipeline at the wellhead. During pump landing to the well on s tube string, capillary pipeline end is equipped with adjustable check valve. Capillary pipeline consists of one capillary tube with double-layer wire sheath. Pipe string is landed so that a sprayer is positioned against the reservoir bottom. After landing, the pump is launched, product recovery is started. At the wellhead, recovered product is sampled and analysed for calcium ion content in associated water. Depending on the analysis result, reagents are dosaged and injected over the capillary pipeline to the bottomhole zone. Relevant salt deposition inhibitors are used as reagents in respective amounts. Recovered product is sampled regularly at the wellhead and analysed. If calcium ion content in associated water exceeds 100 mg/L, inhibitor amount dosaged to the capillary pipeline is increased by 10-20% of initial value to achieve calcium ion content in associated water below 100 mg/L.

EFFECT: increased efficiency of sedimentation prevention.

1 dwg, 1 tbl