SU58690A1 - Sentinel guide for lowering the curvature measuring device placed inside the borehole - Google Patents

Description

The petroleum industry has a widespread acceptance of measuring a well’s crush by throwing an instrument in a guide shell into drill pipes if a bit is to be raised, or by lowering a guide stick with a tool into a drill pipe on a cord, if there is no lift. The purpose of the guide groove is, on the one hand, to serve as a protection for the measuring device against external pressure and, on the other, to serve as a direction for the measuring device.

Such a guide: and the scrape is an elongated projectile, the upper part of which has a cylindrical chamber, hermetically closed siisa with a nipple and serves to sweep the measuring device. The nipple has a locking connection on itself to attach the cord in case of the descent of the apparatus on the cord. In the upper cylinder chamber there are two damping springs, between which the measuring device is placed.

The lower part of the guide zhelonka is a nozzle

with holes drilled for weight relief, ending with a cone guide.

The pressure inside the upper hermetic part of the guide bark is 1 atm. regardless of the depth of immersion zhelonka. The external pressure, as the shells descend into a well filled with fluid, increases.

The pressure acting on the guide sill, dropped or lowered to a depth, is equal to the difference between the external and internal pressures, and with a well depth reaching 3000 m and more, it is 660 kg / cm and higher. The negative side of the resulting high pressure is that to protect the measuring device from this pressure one has to go to an increase in the thickness of the walls of the bark, which leads to a decrease in the useful size. Another unpleasant consequence of this high pressure is the unreliability of the seal (rubber ring or hemp wrapping), which seals the cylindrical tube with the gauge from external pressure. As the terms

Since the nozzle has a small annular support surface (pipe thickness), this makes it impossible to have a seal with a sufficiently large surface. With the constructions so far known, there have been cases when the guiding zolka has seen external pressure and fluid penetration through the seal into the inside of the bile, which is accompanied by damage and measuring equipment.

The invention has to simplify the seal and exclude the possibility that the guide zhelonka see the external pressure by the fact that during its descent and ascent, a pressure equal to the external pressure is established inside the upper hermetic part. This eliminates the possibility of visibility and makes sealing easier.

According to the invention, this is achieved by placing in the guide nozzle a flexible closed hose filled with a liquid intended to push it through the nipple into the nozzle containing a measuring device with damping springs under the action of a liquid column increasing with the lowering of the jelly.

In FIG. I depicts a longitudinal section of the zhelonka and FIG. 2, 3 and 4 are corresponding sections along LINES II-II, III-III, IV-IV in FIG. I.

Two nozzles 1 and 2 are connected to each other by a nipple 3. The lower nozzle 1 has a series of drilled holes and ends with a cone 4 extending a guide.

A measuring device 5 and a stopper 6 with a lock 7 screwed on it are inserted into the cavity of the socket 2 to engage the hoisting rope. The outer shape of the lock is conical for guiding when lifting the guide rail on the rope. The nipple 3 is fitted with a flexible hose 8 that fits in the lower pipe I and is filled with liquid, which can pass through the hole in the nipple 3 to the pipe 2.

The action of such a guiding guide is as follows.

A measuring device 5, consisting of a glass vessel filled to a certain height with hydrofluoric acid, is inserted into the shell. The vessel of the measuring device on top of the acid is filled with a liquid that does not react with it and has a smaller specific gravity. The cork plug is wrapped in jtecTO using Sealing to separate the interior of the bile from the mud of the well.

The guide cusk descends on the rope or is dropped into the drill pipe. As the borehole B lowers, the external pressure acting on Shotang 8 through the hole in the pipe 1 increases, and the fluid from the hose 8 is displaced into the upper pipe 2. As the guide bushing is raised, the external pressure gradually decreases and the liquid passes from the pipe 2 into the flexible hose 8. At the same time, both during the descent and during the ascent, during the whole time the jelon is in the well, regardless of the depth of its immersion, the internal pressure in the nozzle 2 is automatically maintained equal to 1 external pressure acting on the patra about 2, resulting in the absence of pressure crushes the pipe 2. Since the vessel of the measuring device 5 is completely filled with liquid, then from the pressure occurring in the pipe 2, it is removed.

The subject matter of the invention.

A guiding nodule for launching a well curvature measuring instrument placed in it, consisting of a guiding nozzle and a shock absorber springs under the measuring device, which are connected to each other by a nipple, characterized in that a flexible closed loop is placed in the direction fitting nozzle 1 a hose 8 filled with a fluid intended to force it through the nipple 3 into the nozzle 2 under the action of the pressure of the liquid column, which increases as the bile is lowered, in order to prevent the pressure from crushing by niem.