Small-diameter sleeve window sidetrack drilling traction type well fixing method

Abstract

The invention relates to a small-diameter sleeve window sidetrack drilling traction type well fixing method, and belongs to the technical field of petroleum and gas well fixing. According to the technical scheme of the small-diameter sleeve window sidetrack drilling traction type well fixing method, a smart short-circuit circulating short joint along with a well fixing pipe column enters a well together; an original well drilling liquid is injected, an annulus is washed, then a special-amount conventional extra-low density well drilling fluid (or branch water), a separating liquid, cement paste and the original well drilling liquid are injected in sequence; a short-circuit circulating channel is opened, and the conventional extra-low density well drilling fluid (orbranch water) enters the annulus; and after the conventional extra-low density well drilling fluid (or branch water) fully passes, the short-circuit circulating channel is closed; the cement paste is pressed into the annulus by using the pressure difference, and the traction type well fixing is formed. The small-diameter sleeve window sidetrack drilling traction type well fixing method has the advantages that by reducing the annulus liquid density, the total pressure borne by the well bottom is reduced, pressing crack of the well bottom is prevented, the one-time success rate of small-diameter sleeve window sidetrack drilling well fixing is greatly improved, the well fixing quality is ensured, the cost is reduced, and pollution of an oil-gas layer is avoided.

Description

technical field [0001] The invention relates to a traction cementing method for a sidetracking sidetracking well with a slim hole casing, and belongs to the technical field of petroleum and natural gas well cementing. Background technique [0002] In the drilling engineering of the petroleum industry, the cementing technology is to cement the drilled open hole section to form a well that can be installed with development equipment. The cementing construction is to install the casing after the well has been drilled The cement slurry is injected into the annulus of the wellbore and the casing, and waits to set to form a solid cement sheath. Slim hole casing window sidetracking is a renewal well or an adjustment well that re-drills the oil layer at a certain distance from the casing damage section by using the casing wellbore above the casing damage section and the original surface oil production process. It has the advantages of less investment, It has the characteristics of ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, and to provide a slim hole casing sidetracking traction cementing method, which has the advantages of simple construction, high reliability, strong practicability, and can effectively solve the problem of slim hole casing Problems such as lost circulation, poor quality, high cost, and polluted oil and gas layers in sidetracking well cementing operations

Images