«Onshore and offshore oil and gas well construction»

Gel-forming liquids for effective killing of gas wells in conditions of loss of Cenomanian deposits in the Western Siberia fields

UDC: 622.279.7+622.245.5
DOI: 10.33285/0130-3872-2023-10(370)-46-53

Authors:

¹ Astrakhan State Technical University, Astrakhan, Russia
² North Caucasian Federal University, Stavropol, Russia
³ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: killing, gas well, abnormally low reservoir pressure, xanthan polymer, gel-forming composition, formation blocking, bottomhole formation zone

Annotation:

The analysis of field data on the workover of wells in gas and gas condensate fields in the Western Siberia shows that traditional killing fluids used in the initial period of a field development (solutions of calcium chloride and sodium, hydrophobic emulsions, invert-micellar dispersions, etc.) become ineffective when reservoir pressure drops down. This is the main reason for a number of negative phenomena that occur during wells workover process and significantly reduce its efficiency, such as: the inability of the reservoir to resist the ingress of bottomhole fluids, the large depth of fluids penetration into the reservoir, including minimal overbalance, the impossibility of creating sufficient drawdown for effective well development, closure of reservoir pores as a result of the repressive effect of process fluids used when conducting workovers. The most promising for blocking well layers under conditions of abnormally low reservoir pressures is the use of gel-forming viscoelastic polymer compositions containing reinforcing additives. Laboratory studies have shown that such compositions can be obtained on the basis of aqueous solutions of xanthan polymers cross-linked with inorganic chromium salts. The gels obtained in such a way are homogeneous in consistency and are characterized by elastic properties. In addition, it was determined that the reinforcement of gels based on aqueous solutions of xanthan polymers with organic mineral fillers makes it possible to more than double their blocking ability against reservoirs with an average permeability of about 1,0 μm².

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