SU859620A1 - Apparatus for filling drilling pipe string by liquid - Google Patents

Description

(54) DEVICE FOR FILLING COLUMN OF DRILL PIPES WITH LIQUID

The invention relates to the oil and gas industry, particularly to devices for filling a drill pipe string with liquid.

A device for filling drill pipes with flushing fluid is made in the whie body with a bypass channel blocked by a spring-loaded rod held by a ball valve and provided with a sealed cylinder with a piston connected hydraulically to the cavity of the pipes. With such constructions, the filling of pipes produced by DGGgs is below the installation location of the valve tl. "5

In order to avoid pipe slackening, it is necessary to install several such valves along the height of pipes being lowered into the well, which is unacceptable since the internal cavity of the pipes must remain free for production, if necessary, of perforation or torpedoing.

It is also known a device for The drill string is filled with a fluid, containing a housing with an axial and 1 channel horn, in which the sealing sleeve and the differential piston are located at the end, with a working chamber 23-30

However, this device does not allow for direct and reverse circulation of the washing liquid. After cutting the studs, the differential piston instantly moves upwards, which leads to a hydraulic shock and results in a contact of the contacting hulls of the housing and the differential bearing. After the valve is actuated, the differential piston remains hydraulically unbalanced. On the one hand, this can lead to axial movement of the piston in the process of lowering the pipe string and impairing the tightness, on the other hand, the design with a hydro-equilibrated movable part is not operable in a gas-liquid and gaseous environment. The rubber seal of the coupling is in fluid flow, which leads to its rapid erosion and also reduces. tightness overlap.

The purpose of the invention is to increase the efficiency of the device by providing the possibility of direct and reverse circulation of the washing liquid and its use in gas-saturated and gas collectors.

The goal is achieved by the fact that the device is equipped with a sealing

a sleeve placed in the working chamber, and the differential piston is made with radial channels and a seat under the ball valve, with the radial channels of the differential piston communicating inside the hub space with the working chamber.

FIG. 1 shows a device for filling a string of drill pipe with liquid, general view, section; in fig. 2 — node I in FIG. one,

The device contains a sub 1, screwed onto the housing 2, with axial 3 and radial 4 channels, inside which the differential piston 5 is seated centrifugally with seals 6 and 7 and a saddle under the ball valve 8, with the housing 2 forming with the piston 3 a working chamber 9, hydraulically tied through channels 10 with in-tube space. The seal of the bushing 11 with seals 12 in the initial positions closes the channels 10, sealing the working chamber 9. The piston 3 is fixed in the housing 2 by means of a lock made, for example, in the form of a safety device, including its elastic ring 13 placed on the conical junction 14 bores of the housing 2, and the push sleeve 15.

The device works as follows.

After completing the assembly of the test instrument complex directly above the formation tester, the device: bring the proposed device into place and drill pipes on the tube. which from the bottom must be filled with a flushing liquid from the annulus. Thus, from the wellhead itself, as soon as the test tool begins to sink into the lateral fluid of the well through the radial channel 4 of the body, it begins to flow into the empty drill pipe. When inside the drill pipe is formed: the estimated height of the liquid column to subsequently create the necessary pressure on the test object, the lock is activated — the pressure bushing, is transfers the force to the split ring 13, which compresses, slides along the taper 1 transition 14 and moves to the inner surface of the housing 2, I will act on the differential piston 5. The latter, moving E1 upwards, closes the radial channels 4, stopping further flow of liquid from the well into the inside of the drill pipe. In this case, the sleeve 11 rests against the upper flange of the housing 2, and with further 1m displacement of the differential piston 5 upward depressurization of the working chamber 9 and its development with the projectile fluid occur, through channels 10 from the inner space. This creates a braking torque and prevents water hammer. Differential piston 5 becomes hydro-balanced.

Further descent of the test tool takes place without filling the tubes with liquid.

For direct and reverse circulation of the flushing fluid, the channels 4 must be opened. With this circuit, after the tube tester is lowered or the fluid flows into the tube cavity, the ball valve 8 is dropped, which sits on the seat in the differential piston 5 and overlaps its inner cavity. Then, above the device, a pressure is created, under the action of which the differential piston 5 is mixed into the lower position and opens the channels 4.

Due to the fact that the differential piston 5 is hydraulically balanced, the device works reliably during low-lift operations. In addition, it can be used not only in liquid, but also in gas-saturated and gas-filled collectors.

The proposed design provides the possibility of direct and back flushing of wells in a gaseous environment, which makes it possible to investigate a well in an open well without running the casing.

By preventing water hammer and see parts of the valve, the durability of the device is doubled.

Claims (1)

1. Author's certificate of the USSR 209359, KJi. E 21 B 21/00, 1968. 2, USSR Copyright Certificate W 206477, cl. E 21 V 49/02,} 967 (prototype).