«Onshore and offshore oil and gas well construction»

Restoration of absorbing wells injectivity

UDC: 622.27
DOI: -

Authors:

¹ Gazprom VNIIGAZ, St. Petersburg, Russia

Keywords: well, injectivity, BWZ, filter, colmatant, process fluid, complexon

Annotation:

The most efficient method of wastewater disposal is its injection into absorbing horizons. In underground wastewater disposal systems, wells are divided into absorption (injection) and observation wells. Absorption wells are used for the injection (underground disposal) of wastewater into absorbing horizons. Their design, in terms of reliability, technological effectiveness, and safety, must enable the combined injection of industrial and domestic wastewater, as well as produced formation water, to perform all types of major repairs and stimulation work to restore well injectivity, and comply with subsoil conservation requirements. This article examines the processes that lead to reduced injectivity of absorption wells at gas fields and underground gas storage facilities (UGS). To destroy colmatation formations and restore the injectivity of absorption wells, a method for regenerating sand filters and cleaning the near-wellbore zone (BWZ) is proposed. A sequence of process operations will restore the injectivity of absorption wells by regenerating sand filters and cleaning the near-wellbore zone, as well as extending the turnaround time.

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