Method for establishing communication connection between upper well completion pipe string and lower well completion pipe string

Abstract

The invention discloses a method for establishing communication connection between an upper well completion pipe string and a lower well completion pipe string. The method comprises the following steps that a sand control screen pipe is connected to the lower end of a connecting assembly, and the sand control screen pipe is lowered into a designed position in a well for setting; the upper well completion string is lowered, an oil pipe is straightened and guided into the sand control screen pipe, a positioning key on the sand control screen pipe makes contact with a single-acting directional plug-in communication assembly installed on the upper well completion string, the positioning key slides upwards along a guiding spiral inclined face of a bevel guide shoe, the single-acting directional plug-in communication assembly is rotated, the pipe string is continuously lowered, a wet joint protection orientation front end on connecting assembly is inserted into a groove in the connecting assembly; and pressure reduction pilot production operation is carried out, and the pressure in an inner cavity and the radial pressure stress change of a reservoir hydrate on the sand control screen pipe are measured through a measuring unit. The method for establishing communication connection between the upper well completion and the lower well completion is achieved, and the compaction sedimentation effect in the hydrate depressurization pilot production process can be monitored in real time through the sand control screen pipe.

Description

technical field [0001] The invention relates to the technical field of gas hydrate test production measuring devices, in particular to a method for establishing a communication connection between an upper well completion pipe string and a lower well completion pipe string. Background technique [0002] The depressurization test production method is considered to be the mainstream technology for hydrate test production, but during the depressurization test production process, reservoir compaction and settlement may occur in the production well. For example, in a certain year in the Nankai Trough in Japan, the seabed deformation was measured and it was confirmed that the top of the production well had subsidence on the order of centimeters after several days of decompression and test production. Sand phenomenon. [0003] Compared with the gas production application of conventional oil and gas wells, the service life of the sand control screen used in the hydrate test producti...

AI Technical Summary

Problems solved by technology

[0003] Compared with the gas production application of conventional oil and gas wells, the service life of the sand control screen used in the hydrate test production in the ocean is far from the original normal life cycle

Images