SU972048A1 - Plugging tool - Google Patents

Description

(54) SPRAY BLADE

The invention relates to drilling, in particular, cementing tools to isolate absorption zones and install bridges in wells.

A well-known tool for plugging wells, which consists of an adapter, a pipe, a nipple, a shoe, a diaphragm, a piston, a check valve and a spring 1.

The disadvantage of this projectile is that it cannot be used for powdery, quick setting cement materials.

The closest technical solution to the invention is a cementing device for isolating absorption zones and installing bridges in wells, including a housing, a piston installed in it, easily destructible containers with a dry cementing material, placed under the piston, and a shoe, in the axial pockets of which Yozhi 2 installed.

However, such a projectile has the following disadvantages: the inability to accurately determine the end of the process of complete extrusion of flexible containers with HFcw material tamponage material, the impossibility of balancing reservoir and hydrostatic pressure of a liquid column when lifting a projectile out of a well, the poor quality of the tampon-like materials. for the impossibility of rotating the projectile at the moment of extrusion of these materials, the impossibility of using the projectile for plugging dry wells due to impossible

10 adding wash liquid for mixing the powdered grouting material; impossibility of using this projectile in small diameter wells due to small difference

15 areas of the piston and drill pipe all this leads to low reliability of the projectile and low quality insulation of the absorption zones.

The purpose of the invention is to increase the reliability of controlling the extrusion of containers from the projectile.

The goal is achieved by the fact that the piston is made with a through axial channel and is provided with a non-return valve located in this channel spring-loaded with respect to it, made in the form of a rod with longitudinal grooves along its length, with a lock located at the top.

30 rod, and a locking element that interacts with containers, the diameter of which is less than the diameter of the axial channel of the shoe.

Figure 1 shows the shot d, a general view; 2 is a section A-A in FIG. on fig.Z - section bb in figure 1.

The backing projectile consists of a housing 1, a piston 2, which has a CO through an axial channel under the valve 6, which has a spring 4, a locking element 5 and 6 with a lock 7. The locking element 5 is installed in the lower part of the piston .2 sec. interactions with easily destructible x-bin containers 8, filled with dry cement material. In this case, the locking element is made with a diameter smaller than the axial channel 9 of the shoe 10, in which the knives 11 are installed. The rod b is made with longitudinal grooves 12. along the length exceeding the height of the piston 2. A plug 13 is installed in the shoe of the projectile.

Cement sludge d works as follows.

At the wellhead, body 1 is filled with liquid and containers 8 (for example, made of polyethylene) are lowered into it with pre-compacted dry powdered fast-setting cement material to the desired density. Then the shell is lowered onto the pipe at the desired interval of the well. Fluid through the housing above the piston 2 is pumped through the pipes by means of a pump. At the same time, the cement plug is rotated. containers are not deformed. After extrusion, the plugs 13 slowly raise upwards. The containers, the passage through the knives 11, are cut, and the tamping material receives a rotational movement and intensively mixes with the fluid, filling the full volume of the well, cavities and fractures. At the time of stopping the piston 2 in the shoe 10 and squeezing the last container with the cement mat | The signal is a complete extrusion of the cement material. After that, the rotation of the projectile and the flow of fluid is stopped. The valve 3 returns to its original position under the action of the compressed spring 4. Then same

the piston compaction (tamping) of the shuttered quick-set cement mix into the absorbing reservoir.

The proposed device allows

0 to accurately determine the end of the process of complete extrusion of powdered quick-setting cement material, which, with vigorous stirring with a liquid

5 forms a uniform, uniform, with the same structural and mechanical properties, a quick-setting leakage mass, which, quickly gaining strength, forms a quality insulating bridge. This is especially important in combating wellbore collapses, catastrophic and total absorption of flushing liquid. The device also allows

suprapmenting

these wells, to balance the reservoir and hydrostatic pressure of the liquid column when lifting the projectile from the well.

Claims (2)

1. Kuimov A.V. Technique and technology exploration, production organization. M., VIEMS, 1973, p. 13. 2. USSR author's certificate 658262, cl. E 21 V 33/138, 1977 (PROTOTYPE).