SU1602978A1 - Valve for formation tester - Google Patents

Abstract

The invention relates to the mining industry and is intended to fill a tubing string during the descent of test equipment and to provide well circulation. The goal is to increase the reliability of the valve by preventing it from prematurely triggering when creating an overpressure in the sub-packer zone and when the fluid circulates through the packer. For this, the valve has two shear plugs 6 and 7, each of which is made with an axial bore and one plugged end. An additional radial channel above the axial channel is made in the valve body 1. The plug 7 is installed in the radial channel of the housing 1 with the possibility of communication in the extreme upper position of the stepped hollow piston 3 of its cavity with the space behind the housing 1. The plug 6 is installed in the radial channel of the larger diameter piston 3 with the communication of the annular chamber 5 with the piston cavity 3. After descending test equipment before and after well testing, when it becomes necessary to displace the selected formation fluid or previously filled fluid from the cavity of the pipe string, they drop vol into the pipes Rui post. She, hit the plug 7, cuts it, together with the annulus with the internal pipe through the channel. 3 il.

Description

Phi1.1

vym channel. The stopper 7 is installed in the radial channel of the housing 1 with the possibility of communication in the extreme upper position of the stepped hollow piston 3 of its cavity with the space behind the housing 1, the stopper b is installed in the radial channel of the step of larger diameter of the piston 3 with the possibility of communication of the annular chamber 5 with the piston cavity 3 After descent

test equipment before and after well testing, when it is necessary to displace the selected formation fluid or previously filled fluid from the cavity of the pipe string, the second rod is dropped into the pipes. She, hit the plug 7, cuts it together, together with the tube space with the pipe inside the channel. 3 il.

The invention relates to the field of the mining industry, in particular to equipment for testing wells with test formations, and is intended to fill the tubing string while descending the test equipment and ensuring the circulation of the well.

The aim of the invention is to improve the reliability of the valve by preventing its premature actuation during the creation of an overpressure in the sub-packer zone and during the circulation of fluid through the packer.

FIG. 1 shows a longitudinal section through a valve in the process of filling pipes; in fig. 2 - a general view of the bar; in fig. 3 is a longitudinal section of the valve after closing the filling channel.

The valve includes a stepped body 1 with an axial channel, a sub 2, a stepped hollow piston 3, spring-loaded by means of a spring 4. Between the stepped body and the piston is formed an annular chamber 5 filled with liquid. In the stepped piston 3, the middle plug 6 is screwed in with a cut along the perimeter of a brittle material. In the piston 3 and the plug 6, axial channels A and B are permanently communicated with the hydraulic chamber 5. In case 1, an additional radial channel is provided above the axial channel B, in which the plug 7 is movably mounted in the radial direction with a notch along the perimeter. In the initial position, the plug 7 is moved to the outer surface of the housing 1 and is located between the step 8 and the stepped piston 3, as shown in FIG. 1. Radial cdnals C and D, located respectively in the housing and the piston, communicate between each other. In order to avoid turning the stepped piston 3 relative to the housing 1, grooves 9 are provided in the piston 3, and a key 10 in the housing.

Before the valve is lowered into the well, chamber 5 is filled with fluid through channel E until the channels C and D are fully aligned with each other. Then camera 5 is muffled.

plug 11. The device is installed through a pipe over a set of test equipment. During the descent of the device into the well, the fluid from the annulus through the channels C and D enters into the pipe string and fills it. After lowering the planned number of pipes that need to be filled with well fluid, the pipes are thrown into the pipes.

rod 12 (Fig. 2), which, hitting the plug 6, cuts it off. Under the action of the overpressure created by the spring, the liquid from the chamber 5 through the channels A and B flows into the pipes and the stepped piston

3 moves up. As a result, the filling channel B is sealed off by seals, and the channel G of the stepped piston is aligned with the axis of shear plug 7. With further descent of the pipe string, the pressure inside

the pipes become less than the pressure in the annulus and due to the pressure difference, the movably formed plug 7 through the channel G of the piston moves inside the device, as shown in FIG. 3

After the test equipment is lowered before and after the well test, when it is necessary to displace the selected formation fluid or previously filled fluid from the cavity of the column

pipes (to eliminate siphons when lifting the pipe string), a second rod is dropped inside the pipes. The bar, hitting the plug 7, cuts it together, together with the annulus and the internal pipe through channel D. After

equalizing the pressure or displacing the selected formation fluid by creating a reverse circulation will raise the tool.

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Claims (1)

Invention Formula The valve for the formation tester, comprising a housing with axial and radial channels and a spring-loaded stepped hollow piston located therein with radial channels in steps of different diameter, forming an annular chamber filled with liquid with the body, characterized in that, in order to increase the reliability of the valve by preventing its premature response when creating an overpressure in the sub-packer zone and during circulation of the liquid through the packer. it is equipped with two shear plugs, each of which is made with an axial channel and one plugged end, and the body has up to 12 0ilZ.l additional radial channel made above the main radial channel, one of the plugs installed in the radial channel of a larger diameter piston stage with the possibility of communication of the annular chamber with the piston cavity, and the other movably in the additional radial channel of the housing with the possibility of communication in the extreme upper position of the piston of its cavity with space behind the hull. 7 .З