SU108486A1 - The method of isolating complication zones in the well - Google Patents

Description

The invention relates to methods for isolating zones with collapsing and absorbing rocks encountered during the drilling of wells.

The existing methods for isolating complication zones — cementing, pumping sand, clay, trunks, and others — are time consuming and costly, and in some cases do not lead to positive results.

The proposed isolation method differs from those known in that, in the zone of complications, the wellbore is broken up to set up a casing that is rolled into a coil, which is then unbendable under the influence of hydraulic pressure. This method of isolation makes it possible in a relatively short time to reliably eliminate the complication in the well.

In order to carry out the method, the absorption zone is expanded by 60 mm conventional extenders. in diameter and 5 f up and down from the absorbing reservoir.

The casing pipe is machined eccentrically so that one side maintains a thickness of 10-

12 M.J. and a friend 6 lzh. In a thin place, the pipe is cut along a generatrix, the edges are slightly shifted so that they do not rest against one another when rolled up and put it into a crimping device (FIG. 1) consisting of a pipe / in which a rubber sleeve 2 is placed, hermetically fixed at the ends of the pipe flanges ..

Injecting fluid into the space between the pipe / clamping device and the rubber sleeve 2, the pipe 4 is compressed to the diameter of the restrictor pipe 5. In FIG. 1 shows the device in the position before the pipe is crimped (below) and after the pipe is crimped (above). The maximum outer diameter of the coiled pipe should be 30–40 mm smaller than the diameter of the well.

Two curly stripes b (Fig. 2) are welded to the outer edge of the roll along the generatrix, which, after deploying the roll, act as a lock and prevent the roll from rolling. On fng. 2 shows a device for placing the casing in an absorption zone and unwrapping it, consisting of a drill pipe 7 with openings 8, at the ends of which

the ends of the rubber sleeve 9 are hermetically clamped by means of rings 10. At the lower end of the drill pipe, there is a shoe // with a valve seat, and a tip on the shoe to support the rolled-up casing.

After the device is lowered into the extended interval, clean water is rinsed, after which a valve J2 (Fig. 3) is thrown into the pipes, blocking the release of liquid from the pipes. Pressurizes the fluid into the pipes, raises the pressure to a predetermined value, which is why the rubber sleeve J3 expands and straightens the roll, the ends of which include 13 locks that prevent the roll from collapsing after the pressure is released. Rubber harnesses are placed in the latter to seal the locks.

Having completed the operation of unfolding the casing-roll, clans are removed to the surface by means of a slip and a washing liquid is pumped into the well. If the circulation of fluid has recovered, then

continue drilling in the normal way.

If the washing liquid is not completely eliminated, then cement is pumped under pressure into the annulus.

Subject invention

Claims (2)

1. A method of isolating complication zones in a well, characterized in that, in order to eliminate collapses and absorbing flushing fluid, in the complication interval, the wellbore is worn to be installed in this interval, the casing pipe is rolled up . 2. The form of the pipe for carrying out the method according to claim 1, characterized in that rubber gaskets are placed in the pipe lock.