System and process of screen pipe completion and cross oil layer cementing for steam injection heavy oil well

Abstract

The invention discloses a technology of screen pipe completion and cross oil layer cementing for a steam injection heavy oil well. The technology comprises the following steps: A, downing a completion tube string to a design position; B, downing a cementing tube string to a preset position in the completion tube string; C, suppressing, expanding and sealing a lower high-temperature-resistant packer (7); D, suppressing, expanding and sealing an upper high-temperature-resistant packer (4), boosting and turning on a cement pouring device (3), well flushing with direct cycle; E, performing one-stage cement pouring operation to the bottom of a thermosensitive screen pipe (6); F, performing two-stage cement pouring operation to the top of the thermosensitive screen pipe (6), well flushing with back cycle; and G drawing the cementing tube string, and finishing the well cementation operation. The technology of screen pipe completion and cross oil layer cementing for the steam injection heavy oil well has the advantages that oil layer crossing is achieved, the completion tube string and the cementing tube string are put underwater once and the bottom earth layer on the top of the oil layer, the technical problems existing in the screen pipe completion of heavy oil reservoir that oil flow passages of the screen pipe are jammed by shale hydration and bottom water breaks through a flooded shaft are solved, application range of the screen pipe completion in the heavy oil reservoir is expanded, and exploitation rate of an oil well is increased.

Description

technical field [0001] The invention relates to the technical field of oil production well cementing and completion methods, in particular to a steam injection heavy oil well screen tube completion cross-oil layer cementing system and process. Background technique [0002] The structure of heavy oil reservoirs in most areas of my country is loose sandstone formation, the cementation of oil layers is poor, the viscosity of crude oil is high, and sand production is serious in oil wells. Screen completion can improve the sand control effect of steam injection heavy oil wells, but since the top and bottom strata of heavy oil reservoirs are mostly mud shale layers, the water body at the bottom of the rock formations is well developed, and the cementing technology at the top of screen completion can only seal the reservoir. The bottom shale hydration blocks the oil flow channel of the screen during steam injection, and the bottom water breaks through the water-flooded wellbore dur...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the existing heavy oil well screen completion technology, and provide a steam injection heavy oil well screen that can cross the oil layer, run into the cementing completion string in one trip and seal the top and bottom formations of the oil layer at the same time Pipe well completion spans the oil layer cementing system and technology, solves the technical problems of screen pipe completion in heavy oil reservoirs such as mud shale hydration blocking the oil flow channel of the screen pipe at the bottom, bottom water breaking through the water-flooded wellbore, etc., and expands the screen pipe completion The scope of application of wells in heavy oil reservoirs, improving the production efficiency of oil wells

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