CN219391272U

CN219391272U - RD safety circulation valve tightness test fixture

Info

Publication number: CN219391272U
Application number: CN202320606481.5U
Authority: CN
Inventors: 兰宏刚; 刘建利
Original assignee: Baoji Keyuan Petroleum Equipment Co ltd
Current assignee: Baoji Keyuan Petroleum Equipment Co ltd
Priority date: 2023-03-24
Filing date: 2023-03-24
Publication date: 2023-07-21
Anticipated expiration: 2033-03-24

Abstract

The utility model provides a RD safety circulating valve tightness test fixture, includes adapter sleeve, stop collar and end cap, and the left end of adapter sleeve has the internal thread that is connected with the rupture disk urceolus threaded on the RD safety circulating valve, and the right-hand member has the second internal thread; the plug is in threaded connection with the second internal thread through a first external thread arranged at the left end of the plug, and the plug is movably connected to the right end of the connecting sleeve; the center of the plug is axially provided with a step hole with a large left end and a small right end, the outer wall of the left end of the limit sleeve is provided with a first annular shoulder, the outer wall of the right end of the limit sleeve is provided with a second annular shoulder, the limit sleeve is coaxially arranged in the step hole, the right end of the limit sleeve is inserted into the small end of the step hole, and the second annular shoulder is propped against a third annular shoulder on the step hole; an annular space for accommodating the connecting claw on the RD safety circulating valve is arranged between the limiting sleeve and the plug, and the first annular shoulder is used for propping against the right end of the mandrel on the RD safety circulating valve. The utility model overcomes the defects of the prior art.

Description

RD safety circulation valve tightness test fixture

Technical Field

The utility model belongs to the technical field of oil drilling, and particularly relates to a tightness testing tool for an RD safety circulating valve.

Background

The RD safety circulation valve (see figure 3) is a conventional petroleum downhole testing tool, and at the end of the testing, the pressure applied by a wellhead pump in the annulus between a sleeve and the tool breaks through a rupture disc D, so that a mandrel 7 is pushed to shear a shear pin 8 to move downwards, then a lower ball valve of the tool is closed through a connecting claw 10 and other parts, and meanwhile, an upper circulation hole is opened for circulation and other operations. The key point of the smooth and reliable realization of the functions of the RD safety circulation valve is the sealing effect of three seals in the RD safety circulation valve A, B, C. At present, when the RD safety circulation valve is used for performing a sealing performance test, the rupture disc is taken down, the pressure is applied to the rupture disc installation hole of the outer disc cylinder 9, the mandrel 7 is pushed to move right to shear the shear pin 8, the connecting claw 5 connected with the right end of the mandrel 7 is driven to complete the lower part action of the tool, and the sealing test is completed. However, since the shear pin 8 is sheared, the initial assembly positions of the mandrel 7 and the connecting claw 5 connected with the mandrel are changed, the sheared shear pin 8 needs to be replaced, the mandrel 7 and the connecting claw 5 connected with the mandrel need to be assembled and reset for the second time, the assembly state verified by the test after the second assembly is destroyed, the sealing effect of the three parts A, B, C is difficult to ensure, if retest is carried out, a dead cycle without solution is carried out, therefore, the sealing test is not carried out after the second assembly in the construction site, but the uncertain factors caused by the lack of the sealing test during the second assembly may cause accidents after the RD safety circulation valve is lowered into the well.

Disclosure of Invention

The utility model provides a tightness test tool for an RD safety circulating valve, which can complete tightness experiments without shearing pins, and solves the difficulty of tightness test of the RD safety circulating valve.

The technical scheme adopted by the utility model is as follows: the tightness testing tool for the RD safety circulating valve comprises a connecting sleeve, a limiting sleeve and a plug, wherein the left end of the connecting sleeve is provided with an internal thread in threaded connection with an outer cylinder of a rupture disc on the RD safety circulating valve, and the right end of the connecting sleeve is provided with a second internal thread; the plug is in threaded connection with the second internal thread through a first external thread arranged at the left end of the plug, and the plug is movably connected to the right end of the connecting sleeve; the center of the plug is axially provided with a step hole with a large left end and a small right end, the outer wall of the left end of the limit sleeve is provided with a first annular shoulder, the outer wall of the right end of the limit sleeve is provided with a second annular shoulder, the limit sleeve is coaxially arranged in the step hole, the right end of the limit sleeve is inserted into the small end of the step hole, and the second annular shoulder is propped against a third annular shoulder on the step hole; and an annular space for accommodating the connecting claw on the RD safety circulating valve is arranged between the limiting sleeve and the plug, and the first annular shoulder is used for propping against the right end of the mandrel on the RD safety circulating valve.

The middle part of the periphery of the connecting sleeve is circumferentially and uniformly provided with first spanner clamping positions, and the periphery of the right end of the plug is circumferentially and uniformly provided with second spanner clamping positions.

The first spanner clamping position and the second spanner clamping position are of an outer hexagonal structure.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the utility model, the mandrel is tightly propped by the limiting sleeve, the limiting sleeve is limited and fixed by the connecting sleeve and the plug, the sealing test is completed under the condition that the assembly relation and the relative position state of the RD safety circulation valve parts are unchanged, and then the test tool is dismantled to complete the subsequent assembly of the tool.

2. The utility model realizes the simultaneous completion of the sealing test in the assembly process without a secondary disassembly tool, realizes the tool state verified by the test to be the tool state during the well descending, avoids the uncertainty caused by secondary assembly and lack of the sealing test, improves the reliability of the well descending work of the tool, greatly reduces the labor intensity of workers and saves the cost.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present utility model;

FIG. 2 is a schematic view of the use state structure of the present utility model;

FIG. 3 is a schematic diagram of the structure of the RD safety circulation valve.

Detailed Description

The utility model will now be described in detail with reference to figures 1-3 and the detailed description.

The tightness testing tool for the RD safety circulating valve comprises a connecting sleeve 1, a limiting sleeve 2 and a plug 3, wherein the left end of the connecting sleeve 1 is provided with an internal thread 1-1 in threaded connection with a rupture disc outer cylinder 9 on the RD safety circulating valve, and the right end of the connecting sleeve 1 is provided with a second internal thread 1-2; the plug 3 is in threaded connection with the second internal thread 1-2 through a first external thread 3-1 arranged at the left end of the plug 3, and the plug 3 is movably connected to the right end of the connecting sleeve 1; the center of the plug 3 is axially provided with a step hole 3-2 with a large left end and a small right end, a first annular shoulder 2-1 is arranged on the outer wall of the left end of the limit sleeve 2, a second annular shoulder 2-2 is arranged on the outer wall of the right end, the limit sleeve 2 is coaxially arranged in the step hole 3-2, the right end of the limit sleeve is inserted into the small end of the step hole 3-2, and the second annular shoulder 2-2 is propped against a third annular shoulder 3-3 on the step hole 3-2; an annular space 5 for accommodating a connecting claw 10 on the RD safety circulation valve is arranged between the limit sleeve 2 and the plug 3, and the first annular shoulder 2-1 is used for propping against the right end of a mandrel 7 on the RD safety circulation valve.

In order to facilitate clamping of the wrench during installation, first wrench clamping positions 1-3 are circumferentially and uniformly distributed in the middle of the periphery of the connecting sleeve 1, and second wrench clamping positions 3-4 are circumferentially and uniformly distributed in the periphery of the right end of the plug 3. The first spanner clamping positions 1-3 and the second spanner clamping positions 3-4 are preferably of an outer hexagonal structure.

During sealing test, the connecting sleeve 1 is in threaded connection with the external thread at the right end of the rupture disc outer cylinder 9 on the RD safety circulation valve through the first internal thread 1-1 at the left end of the connecting sleeve, the connecting claw 10 on the RD safety circulation valve extends into the annular space 5, the rotary plug 3 pushes the limit sleeve 2 to move left, the right end of the mandrel 7 on the RD safety circulation valve is sleeved into the left end of the limit sleeve 2, and the first annular shoulder 2-1 abuts against the right end face of the mandrel 7. Then, a hoop joint 11 is arranged on the periphery of a rupture disc mounting hole on the outer rupture disc cylinder 9, an air inlet nozzle 12 is arranged on the hoop joint 11 in a sealing mode, the air inlet nozzle 12 is communicated with the rupture disc mounting hole, experimental equipment is started to press more than 70MP through the air inlet nozzle 12, and whether the value of a pressure gauge is kept unchanged or not is observed after pressure is maintained for 15-20 minutes so as to test the tightness of the RD safety circulation valve. Because the mandrel is positioned and cannot axially move in the testing process, the problem that the shear pin 8 is sheared is avoided, and the sealing test of the RD safety circulation valve in the assembling process is realized.

The above embodiments are only preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, so that all equivalent modifications made by the appended claims shall be included in the scope of the present utility model.

Claims

1. RD safety circulation valve leakproofness test fixture, its characterized in that: the novel high-pressure self-locking device comprises a connecting sleeve (1), a limiting sleeve (2) and a plug (3), wherein the left end of the connecting sleeve (1) is provided with an internal thread (1-1) in threaded connection with a rupture disc outer cylinder (9) on an RD safety circulation valve, and the right end of the connecting sleeve is provided with a second internal thread (1-2); the plug (3) is in threaded connection with the second internal thread (1-2) through a first external thread (3-1) arranged at the left end of the plug, and the plug (3) is movably connected to the right end of the connecting sleeve (1); the center of the plug (3) is axially provided with a step hole (3-2) with a large left end and a small right end, a first annular shoulder (2-1) is arranged on the outer wall of the left end of the limit sleeve (2), a second annular shoulder (2-2) is arranged on the outer wall of the right end of the limit sleeve (2), the limit sleeve (2) is coaxially arranged in the step hole (3-2), the right end of the limit sleeve is inserted into the small end of the step hole (3-2), and the second annular shoulder (2-2) is propped against a third annular shoulder (3-3) on the step hole (3-2); an annular space (5) for accommodating a connecting claw (10) on the RD safety circulation valve is arranged between the limit sleeve (2) and the plug (3), and the first annular shoulder (2-1) is used for propping against the right end of a mandrel (7) on the RD safety circulation valve.

2. The RD safety circulation valve tightness test tool according to claim 1, wherein: the middle part of the periphery of the connecting sleeve (1) is circumferentially and uniformly provided with first wrench clamping positions (1-3), and the periphery of the right end of the plug (3) is circumferentially and uniformly provided with second wrench clamping positions (3-4).

3. The RD safety circulation valve tightness test fixture as claimed in claim 2, wherein: the first spanner clamping positions (1-3) and the second spanner clamping positions (3-4) are of an outer hexagonal structure.