Split negative-pressure backflow machine and technological method

Abstract

The invention discloses a split negative-pressure backflow machine and a technological method, and belongs to the technical field of acidification backflow and negative-pressure plug removal of oil-water wells. An upper joint is connected with a middle joint; the middle joint is connected with an outer cylinder and a shunt joint; an inner cavity of the middle joint is connected with diffusion pipes and a throat pipe; an inner cavity of the shunt joint is connected with a nozzle and a guide cone; the outer periphery of the shunt joint is connected with a backwashing valve and a lower joint; and a locking ring is connected between the middle joint and the diffusion pipes. The split negative-pressure backflow machine and the technological method have the advantages of split structure, enlargement of internal acid squeezing channel and improvement of acid squeezing efficiency. The device solves the problems of overhigh acid squeezing pressure and easy blockage of the throat pipe by a temporary blocking agent.

Description

technical field [0001] The invention relates to a split-type negative pressure flowback device and a process method, belonging to the technical field of oil-water well acidification flowback and negative pressure unblocking. Background technique [0002] With the deepening of oilfield water injection development, various operations in each stage of oil well development will cause various external fluids to enter the formation. The external fluid entering the oil layer is incompatible with the formation rock, the temperature, ionic composition, pH value and salinity of the fluid, causing formation damage, resulting in the migration of formation particles, precipitation of inorganic scale, and precipitation of organic scale, thus causing formation blockage near the wellbore , The production capacity of oil wells declined rapidly, seriously affecting the development level of oil fields. Implementing effective acidizing and plugging removal can effectively increase single well ...

AI Technical Summary

Problems solved by technology

[0006] Before being put into the throat, the inner diameter of the negative pressure flowback device can reach up to 40mm, which is 29.3mm larger than the original integrated flowback device, which effectively solves the problem of high extrusion pressure and temporary blocking agent stuck in the throat when the temporary blocking agent is acidified problem; realized the smooth passage of large particle size temporary plugging agent, and has the function of throwing ball;

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