Experience of using the Aptian-Albian-Cenomanian hydrogeological complex in the disposal of produced water from the Kamennoye subsoil area

The objective of the presented study is to assess the efficacy of the Aptian-Albian-Cenomanian hydrogeological complex in the disposal of surplus associated water generated in large quantities during oil production within the Kamennoye subsoil area.

The necessity for utilising produced water within the Kamennoye subsoil area is justified by the accumulated volume of water currently exceeding 10 000 thousand m³. The water content in wells' production at the Kamennoye subsoil area is 52-55 %. Furthermore, further extraction will result in an increase in the water cut. One of the key challenges facing subsoil users is to minimise the negative impact of water disposal into the absorbing horizon.

In the course of the study, the following tasks were solved: assessment of the natural geological and hydrogeological conditions of the Aptian-Albian-Cenomanian hydrogeological complex, analysis of the stability of the hydrogeochemical indicators of the groundwater in the complex based on the results of monitoring studies (since the 1960s), assessment of the compatibility of the produced water and the formation water by calculating the carbonate equilibrium of the system. The obtained solution of each of the above tasks indicates the rationality of using the Aptian-Albian-Cenomanian hydrogeological complex for the disposal of produced water. The article also emphasises the necessity of continuous improvement of the system for monitoring the condition of the absorbing horizon, as well as careful observance of all environmental protection measures, which is a prerequisite for preserving the natural balance of the subsoil of the West Siberian oil and gas basin.

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