Device and method for filling foam drainage agent automatically under shaft

Abstract

The invention discloses a device for filling a foam drainage agent automatically under the shaft. The device is characterized in that an inner barrel (2) is respectively connected with an upper connector (1) and a lower connector (4), a plug (7) is arranged at the lower end of a lining pipe (3) arranged in the inner barrel (2), and an automatic foam drainage agent filling mechanism comprises an upper outer barrel (8) sleeved outside the inner barrel (2) , a gas filling chamber (9) arranged in the upper outer barrel (8), a corrugated pipe (10), a ball valve (11), and a valve base (12); a setting mechanism comprises a rubber barrel (18) sleeved outside the inner barrel (2), a metal ring (19), a lower outer barrel (20), a ring clamp spring base (21) and a setting piston (22), wherein the ring clamp spring base (21) and the setting piston (22) are arranged in the lower outer barrel (20). The invention further discloses a method for filling the foam drainage agent automatically under the shaft. The device and method for filling the foam drainage agent automatically under the shaft have the advantages that automatic filling of the foam drainage agent and automatic control over filling amount are achieved by using changes of pressure in a well bore, and the effects of drainage and gas recovery are obvious, wherein the changes of the pressure in the well bore are caused by liquid loading in the well bore of a gas well; in addition, the device for filling the foam drainage agent automatically under the shaft is wide in application range, ingenious in conception, strong in stability, simple in operation and convenient to manage.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a device and method for automatically injecting foam-discharging agent downhole. Background technique [0002] During the production process of the gas well, the liquid is produced in different degrees. At the initial stage of the gas well's production, it can rely on its own energy to bring the accumulated liquid out of the wellbore. With the production of the gas well, the energy of the gas well decreases, and the wellbore will form liquid accumulation, which affects the production of the gas well. . Through the foam drainage gas recovery process, that is, inject foam drainage agent into the gas well to reduce the density of the wellbore fluid accumulation, reduce the critical liquid carrying capacity of the gas well, and bring the fluid accumulation out of the wellbore to achieve the purpose of maintaining the normal production of the gas well. ...

AI Technical Summary

Problems solved by technology

If the amount of foaming agent injected is too small, the purpose of improving the gas-water two-phase flow in the wellbore cannot be achieved. back pressure

It is difficult for the conventional foam drainage gas recovery process to deliver the most reasonable dose of foam drainage agent to the wellbore fluid accumulation position, therefore, it is necessary to provide a new foam drainage agent injection device for the foam drainage gas recovery process

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