SU1484912A1 - Packer - Google Patents

Description

The invention relates to the mining industry and is intended to divide the wellbore. The goal is to increase the efficiency of the packer by ensuring that it can be used in well testing.

in the process of drilling without lifting the bit, the Packer contains a body 1 movable in the axial direction with annular 2

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and pressure 16 protrusions on the inner surface. In case I on the hollow stem 4, having a piston 5, a sealing element 3 is placed. In case 1 a spring-loaded non-return valve is placed, the Packer has an additional spring-loaded non-return valve with an adjusting screw 15. The body 1 is made with an additional annular protrusion to accommodate a screw 15 in it The housing 1 has in the lower part above the protrusion 16 a radial channel for the communication of the sub-piston cavity of the housing 1 with the space behind it. Element 3 perceives a part of the compressive load transmitted in

on the packer. As the body moves downward relative to stem 4, element 3 increases to the diameter of the well, sealing the area to be tested. 1 il.

δ 1484912

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1484912

The invention relates to the pursuit of industry, in particular to devices for the separation of the wellbore. five

The purpose of the invention is to increase the efficiency of the packer by allowing it to be used when testing a well in the drilling process without lifting the bit. ten

The drawing shows the proposed packer,

The packer includes a housing 1 with an annular protrusion 2, a sealing element 3, a piston rod 4 with a piston 5, forming a sealed high-pressure chamber 6 filled with a liquid (for example, oil) with the body parts. In the upper part of the packer there is a separation piston 7, Which, together with the body parts and the stem, forms a low pressure chamber 8 filled with liquid.

To transfer torque to the packer rod in housing G, we have 25 keys 9, and grooves 10 in the rod,

In the protrusion 2 of the housing has a plunger 11, which with the help of a spring 12 is pressed up and performs the function of a check valve. In the protrusion of the housing 30

An additional non-return valve is also provided, consisting of a plunger 13, pressed by a spring 14 under a certain force with the help of an adjusting screw 15 placed in an additional ring hull. At the same time, the valve spring 14 is adjusted so that during the drilling of the well, the plunger * 13 13 did not move upward due to 40 overpressure in chamber 6.

A radial channel B is provided in the housing, which is permanently connected with the pressure lug of the 16 body and the piston 5 of the rod by the chamber 45 17 placed with meekdu.

Channel B connects camera 17 to the space behind housing 1,

When drilling a well with the tester's complex without raising the bit _: 50 axial compressive load from the body ΐ is transmitted to the rod through the hydraulic chamber 6, bypassing the sealing element 3, As a result, pressure in this chamber (depending on the transferred compressive load -Ch) rises to a certain size, but at the same time, the plunger 13 when-ι presses down to the ledge 2 of the body, and ka4

cash A is isolated from the message with camera 8,

After opening the formation scheduled for the test, the drilling is stopped and an axial compressive load is transferred to the lower part of the pipe string that exceeds the axial load transferred to the bit during the drilling process. As soon as the axial load on the packer exceeds the set value, the plunger 13 will move upward, compressing the spring 14, communicating channel A with chamber 8, and the brake fluid from high-pressure chamber 6 begins to flow through channel A into low-pressure chamber 8, as a result of the sealing element 3 perceives a part of the total compressive load transmitted to the packer. As the body moves downwards relative to the stem, the sealing element increases to the diameter of the well, sealing the area to be tested. At the same time, chamber 17 increases in volume, but the presence of channel B, which is constantly communicated with the annular space, eliminates the possibility of a vacuum in this chamber. As a result, the occurrence of a holding force in chamber 17, which prevents normal well packing, is eliminated.

After testing the well on the column _; On the pipes, a tensile load is transmitted. In this case, the action of the weight of the tool suspended from the packer ^ as well as the elastic forces of the sealing element 3, the body 1 moves upwards, and the pressure in the chamber 6 decreases.

Under the action of the pressure difference in the chambers, the plunger 11 moves downward, compressing the spring 12, and the brake fluid flows through channel B back from chamber 8 to chamber 6, and the well is unpacked. After completing all the testing operations, the packer drilling can be continued to open and test the next interval in the described sequence,

Claims (1)

Claim Packer containing axially movable body with an annular and pressure lugs on the inner surface, sealing element, five 1484912 mounted in a housing on a hollow rod with a piston and placed in a “housing” spring-loaded non-return valve, which means, in order to increase the efficiency of the packer by providing it with the ability to use it when testing the well during drilling without lifting the bit. it is supplied additionally 6 a back-loaded spring-loaded check valve with an adjusting screw, and the housing is made with an additional annular protrusion to accommodate an adjusting screw, with the housing having a radial channel in the lower part above the pressing protrusion for communication of the housing piston cavity with space behind it.