METHOD OF WELL COMPLETION WITH FIBERGLASS CASING STRING Russian patent published in 2024 - IPC E21B43/10 E21B33/124 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to methods of well completion using fiberglass casing strings. Method of well completion with fiberglass casing string includes lowering of fiberglass casing string into well. First, geophysical investigations are carried out, the results of which are used to determine the number and intervals of occurrence of water-bearing and productive formations. In the process of lowering the fiberglass casing string, the following is sequentially screwed on it from bottom to top along the lowering process: water-swellable packer plugged in the lower part, which allows to close the interval of the lower boundary of the productive formation, perforated fiberglass pipes, water-swellable packer, which allows covering the interval of the upper boundary of the productive formation, solid fiberglass pipes, water-swellable packer inside the lower pipe of the previous string, solid fiberglass pipes. After the fiberglass casing is lowered into the well, activation fluid is pumped, displacing the drilling fluid, leaving the well at rest to activate the water-swellable packer to cover the interval of the lower boundary of the productive formation, water-swellable packer to cover the interval of the upper boundary of the productive formation and the water-swellable packer inside the lower pipe of the previous string and complete overlapping of the annular space.

EFFECT: proposed method enables to efficiently complete the well by lowering a fiberglass casing string, which is not subject to corrosion during operation, reliably isolate the productive formation without using the cementing technology using water-swellable packers, eliminating the perforation operation inside the well due to the use of pre-perforated fiberglass pipes, due to this, the possibility of the light fiberglass casing string surfacing at the wellhead is excluded, as well as the negative effect of the cement mortar on the productive formation.

1 cl, 1 dwg