2 results about "Temporary seal" patented technology

The application discloses a kind of underground main structure modular temporary plugging wall and its construction method, and plugging wall includes: the connecting reinforcement for being arranged at the port of underground main structure, for assisting to strengthen positioning plugging wall overall structure;Prefabricated concrete module, including square module main body, module interconnection mechanism, pre-embedded handle, reinforcing rib plate, water stop unit;The module interconnection mechanism includes the groove being opened in the periphery of the module main body, the connecting reinforcement being fixedly connected with module main body and the end being elongated into the groove, the interconnection component for the interconnection of connecting reinforcement between modules;By using modular prefabricated concrete structure assembly to form temporary plugging wall, effectively solve the technical problem that traditional retaining wall needs to use large mechanical equipment to break, cause pre-embedded component and waterproof layer to cause damage, enhance the safety of construction, ensure the structure connection quality, simultaneously detachable module group can realize reuse, with green environmental protection effect.

The present application relates to a kind of water plugging methods of screen gravel filling self-flowing oil well, including accurate identification water layer section by comprehensive well logging, production logging and numerical simulation data;Determine packer setting position based on well condition and indoor experiment;Design coiled tubing and tubing annulus injection temporary plugging agent temporary sealing upper oil production layer and gravel packing annulus, while injecting temporary plugging agent, coiled tubing injects certain viscosity preflush, prevent temporary plugging agent from entering bottom water production layer, prevent subsequent main blocking agent damage;Determine preflush viscosity according to reservoir permeability simulation sand filling pipe test.Determine main blocking agent injection time according to temporary plugging agent gel time, ensure that main blocking agent enters water production layer after gelation.Main blocking agent needs to have lower viscosity, to ensure that it enters water production layer first, and forms high-strength plugging barrier;Finally, release packer and induce flow.This application has achieved the beneficial effects: realize the deep precise plugging of water production layer, maximize the protection of oil production layer, effectively extend the self-flowing period of oil well and improve the recovery of crude oil.