Multifunctional intelligent oil well thermal washing stratum protector and working method thereof

Abstract

The invention provides a multifunctional intelligent oil well thermal washing formation protector and a working method thereof. The multifunctional intelligent oil well thermal washing formation protector comprises an exploitation oil pipe, an oil pump, a pipe column, a packing center pipe, a plurality of back pressure communication units, a plurality of controllable packing units, a control unit and a check valve, wherein the exploitation oil pipe, the oil pump, the pipe column and the packing center pipe are arranged in sequence in the axial extension direction of an oil well casing and internally communicate with one another; the plurality of back pressure communication units are arranged on the outer surface of the pipe column; a first opening part and a second opening part which can be opened are arranged on the back pressure communication units, and the interiors of the back pressure communication units selectively communicate with the first opening part, the second opening part and the interior of the pipe column; the plurality of controllable packing units are arranged on the outer surface of the packing center pipe; each controllable packing unit is internally provided with a packing assembly which is used for packing the annular space, and each controllable packing unit is further provided with a sand washing assembly which is used for cleaning sand; and the control unit is used for driving the controllable packing units or the sand washing assemblies to act or reset.

Description

technical field [0001] The invention relates to the technical field of oil exploitation equipment, in particular to a multi-functional intelligent oil well heat-washing formation protector and a working method thereof. Background technique [0002] Oil well hot washing is a method of cleaning oil well wax without snubbing, shortening or eliminating oil well recovery period, less pollution to oil well formation, and low wax removal cost. It is to inject hot water into oil well casing under the condition of wellhead insulation. When injecting the well flushing fluid, the well flushing fluid will flow down along the outer wall of the oil well casing, and all the wax will be discharged under the condition of heat preservation, so the recovery period of the oil well is very short. In order to prevent the flushing fluid from entering the formation and contaminating the reservoir, usually the oil well uses a packer to prevent the flushing fluid from entering the formation. The pac...

AI Technical Summary

Problems solved by technology

In order to prevent the flushing fluid from entering the formation and contaminating the reservoir, usually the oil well uses a packer to prevent the flushing fluid from entering the formation. The packer is located downhole for a long time, and the sand will cause the sand to be buried and the packer cannot be lifted smoothly, which may lead to high maintenance costs

Workpieces such as packers for oil wells are usually set hundreds of meters to thousands of meters away from the ground. When remotely controlling the packer deep underground, the signal transmission will be greatly affected, resulting in damage to the packer. remote control is unreliable

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