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Mud volcano (show of water and gas) on Kalamkas well No.8237

24.05.2019

On 22 May 2019 at 6:20PM 40-50cm show of water and gas (mud volcano) was detected at Kalamkas field well No.8237. In addition, pressure increase to 4 bars at the wellhead was registered.  The tubing pressure was reduced to 2.2 bars by bleeding.
State authorities were notified accordingly.
Following the first accident that occurred in March 2019 with ignition of the mud volcano a task force was established consisting of experts from KMG Production and Drilling Research Institute, Mangistaumunaigas and independent experts.  This task force identified the investigation area of 4 square meters around the emergency well No.8237. The investigation area covered 98 wells including active, non-active and abandoned wells.  The investigation targeted to determine the source of water and gas show and potential migration of the production-induced gas from gas and water horizons of the field.  Re-showing of mud volcano was expected and a relevant scenario was prepared. 

Emergency well No.8237 was prepared as a relief one in case of re-accumulation of the production-induced gas and water.  The wellhead was BOP-equipped with the bleeding line on the process tank.
To date the emergency operations centre has been established, accident-preventive measures are being taken to ensure safety and contain the water and gas shows:

  • danger zones were identified and fenced off with security posts restricting access of people not engaged directly into emergency response operations;
  • high earth walls were built around mud volcano (with use of marl);
  • the well is controllable and equipped with BOP, kill and choke manifold;
  • the mud volcano is being bled off to reduce the pressure through an environmental tank and vent stack;
  • 8 impacting injection wells within 500m radius were shut down.


Activities to prevent any problems in case of drilling and operation of the field are ongoing. 

JSC NC KazMunayGas

On 22 May 2019 at 6:20PM 40-50cm show of water and gas (mud volcano) was detected at Kalamkas field well No.8237. In addition, pressure increase to 4 bars at the wellhead was registered.  The tubing pressure was reduced to 2.2 bars by bleeding.
State authorities were notified accordingly.
Following the first accident that occurred in March 2019 with ignition of the mud volcano a task force was established consisting of experts from KMG Production and Drilling Research Institute, Mangistaumunaigas and independent experts.  This task force identified the investigation area of 4 square meters around the emergency well No.8237. The investigation area covered 98 wells including active, non-active and abandoned wells.  The investigation targeted to determine the source of water and gas show and potential migration of the production-induced gas from gas and water horizons of the field.  Re-showing of mud volcano was expected and a relevant scenario was prepared. 

Emergency well No.8237 was prepared as a relief one in case of re-accumulation of the production-induced gas and water.  The wellhead was BOP-equipped with the bleeding line on the process tank.
To date the emergency operations centre has been established, accident-preventive measures are being taken to ensure safety and contain the water and gas shows:

  • danger zones were identified and fenced off with security posts restricting access of people not engaged directly into emergency response operations;
  • high earth walls were built around mud volcano (with use of marl);
  • the well is controllable and equipped with BOP, kill and choke manifold;
  • the mud volcano is being bled off to reduce the pressure through an environmental tank and vent stack;
  • 8 impacting injection wells within 500m radius were shut down.


Activities to prevent any problems in case of drilling and operation of the field are ongoing. 
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