SU1458555A1 - Method of setting a dividing bridge in well - Google Patents

Abstract

The invention relates to the field of the mining industry, and more specifically to methods for carrying out repair and insulation works in oil and gas wells. The goal is to increase the reliability of the installation of the separation bridge and improve its quality. In the well to the upper limit of the interval of installation of the bridge down the column of the casting pipe (KZT) 1 from the device. Then, a detachable shank and an elastically deformable separation plug (RP) 3 are let into it to ensure tight fit in the wellbore. After that, pump the buffer fluid and cement slurry 4 and begin to inject the washing fluid. Accepted by the flow of injected fluids, RP 3 pushes the detachable shank up to the landing of its upper end on the locking device of the bottom of КРТ 1, thus blocking it to the required length. As the flushing fluid RP 3 is further injected due to its elastic properties, it is forced through a detachable liner and is installed in the wellbore beneath it. Solution 4 is displaced from the detachable liner, filling the desired well interval. Under the action of the T-material, the material of the detachable shank begins to melt and, due to the difference in density with the cement slurry, forms layers 5 and 6 at the boundaries of the bridge. As a result, the tightness of the bridge is significantly increased under various types of loading. Then, without lifting the main KTZ 1, excess cement slurry is washed from the head of the bridge and the well is left until the cement hardens. 1 h. apt. 3 il. "E tfts sd

Description

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The invention relates to the mining industry, and more specifically to the drilling and production of oil and gas wells, in particular, to methods for repair and insulation works.

The purpose of the present invention is to improve the reliability of the installation of the separation bridge and improve its quality.

FIG. 1 shows the descent of the elastically deformed plug; in fig. 2 - displacement of cement mortar from the shank; on

FIG. 3 - melting of the shank and the formation of 2 sealing layers.

The method of installing the bridge is as follows. A casing of pouring (for example, pump and compressor) pipes 1, equipped at the lower end with a special stop device, goes down to the upper boundary of the interval of bridge installation. After all the preparatory operations (binding cementing techniques, pressure testing of injection lines, preparation of cement slurry) in a co10

This method of installing a separation bridge in the well has the following advantages: a liner at a predetermined interval of the well is delivered directly during the cement bridge installation operation, as a result of which the possibility of sticking it in the interval of installing the bridge is prevented and the degree of filling with the cement slurry of the predetermined interval is increased; sedimentation of the cement slurry is prevented and the tightness of the bridge is significantly increased; costs are reduced in the event of the need for drilling the bridge; the process of uncoupling is simplified

lonnu pouring pipes 1 with ust are allowed

detachable shank 2. Its diameter

| Is selected from the condition of patency through | through the greatest narrowing of the column of inundated tubing pipe 1. Next, let

a deformable separator plug 3 with enhanced elastic properties (for example, sponge rubber),

the diameter of which is chosen from the condition

her tight fit in the wellbore (Fig. 1). After that, pumped buffer fluid and cement slurry 4 and

start pumping squeezing fluid.

Inspired by the flow of injected fluids, cork 3 pushes the shank 2

before landing its upper end on the stopper 5 shank.

The bottom unit of the casting column 1, thereby increasing it to the required length. Thus, the shank 2 delivers to a predetermined interval of the well immediately before the operation.

 With the further injection of the injection pipe into the well and the shank

Because of its elasticity, the plug 3 is plugged with liquid through the interval of the installation of the separation mos: properties through the liner 2 and is installed in the wellbore.

i under it. Cement mortar 4 displaces: s from the shank 2, filling in the required 25 in order to increase the reliability of work on

: well interval (Fig. 2). The installation of the separation bridge and elevation. Under the action of temperature, the material of the shank 2 begins to melt due to the difference in density with the grouting

: the solution forms two sealing layers 5 and 6 at the boundaries of the bridge (Fig. 3), divided into 30 in the installation interval by separating the result, which significantly increases its splicing bridge, and the melting time is leaktight during various types of loading more than the beginning of the tampon. Really married. When this is installed under the wash solution.

volume plug 3 prevents sinking (cross-2. The method of claim 1, wherein

dations) of the cement slurry and more than one part of the molten material of the heavier polymer material. Next, 35 shanks are placed under the cementing without raising the main column 1 with a production solution, in the interval, the excess cement pumping of the separation bridge is washed away, and the other, the thief from the head of the bridge, and the well left above this cementing solution. on OZTS.gravitatsionnogo their separation.

Claims (1)

Invention Formula I. The method of installation of the separation bridge in the well, including the lowering of the port, the injection and displacement of the cement slurry through it with the subsequent removal of the shank, characterized in that. its quality, the liner is lowered by pushing it through the filling pipe with a separating plug, and removing it by melting it with heat, you This method of installing a separation bridge in the well has the following advantages: a liner at a predetermined interval of the well is delivered directly during the cement bridge installation operation, as a result of which the possibility of sticking it in the interval of installing the bridge is prevented and the degree of filling with the cement slurry of the predetermined interval is increased; sedimentation of the cement slurry is prevented and the tightness of the bridge is significantly increased; costs are reduced in the event of the need for drilling the bridge; the process of uncoupling is simplified well tubing and liner Invention Formula I. The method of installation of the separation bridge in the well, including the lowering of the port, the injection and displacement of the cement slurry through it with the subsequent removal of the shank, characterized in that. installation of a separation bridge and raised in the interval of installation of a separation bridge, and the melting time is not more than the beginning of the tampon seizure. As a result of its quality, the liner is lowered by pushing it through the filling pipes with a separation plug, and you remove it: rig.1 (/ r.2 (rig. 3