METHOD TO FIX PROCESS WELLS OF UNDERGROUND STORAGES OF GASEOUS AND LIQUID HYDROCARBONS (VERSIONS) Russian patent published in 2016 - IPC E21B33/138 C09K8/467 

FIELD: construction.

SUBSTANCE: method of fixation of process wells of underground storages of compressed gases and liquid hydrocarbons provides for serial pumping of separate portions of cement mortars that differ in density and component composition into cased process wells. At the same time previously before lowering and cementing of the production string in the section in a non-permeable roof of the rock by mechanical or hydraulic methods, they expand the section of the uncased well shaft with formation of an auxiliary chamber along its vertical axis, the cased pipe string is equipped with a special device with circular channels, arranged in the volume of the created auxiliary chamber, as a plugging mortar for injection of the first portion they use a light cement mortar with density of 1400-1650 kg/m³, with which they fill the annular space of the intermediate and production casing strings from the intermediate string shoe to the well head, as the plugging mortar of injection of the second portion they use the cement mortar with density of 1800-1900 kg/m³, which they use to fill the uncased well shaft to the intermediate casing string shoe.

EFFECT: increased quality of strengthening due to increased tightness of bore hole annulus.

6 cl, 1 dwg