Blowout prevention plug for differential pressure sealing test

Abstract

The utility model belongs to the technical field of oil field water well test blowout prevention, and particularly relates to a blowout prevention plug for a differential pressure sealing test, which comprises a main body, a barrel body is in threaded connection with the inside of the main body, a limiting ring is fixed inside the barrel body, a sealing packing is arranged at the top of the limiting ring, and a packing pressing cap is in threaded connection with the inside of the barrel body. Through the arrangement of the main body, the barrel body, the limiting ring, the sealing packing, the packing pressing cap and the blowout prevention assembly, in the process of using the blowout prevention plug for the differential pressure sealing test, the blowout prevention assembly can achieve double blocking and collection of overflowing oil-water liquid, the collected liquid can be automatically discharged into a liquid collection tank, and the safety of the liquid collection tank is improved. And meanwhile, under the cooperation of the barrel body and the limiting ring, after the packing pressing cap is taken down in the later period, the barrel body can be rotated to take out the sealing packing from the interior of the main body, and therefore the sealing packing can be conveniently replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield water well test and blowout prevention, in particular to a blowout prevention plug for pressure differential sealing test. Background Art

[0002] Oil and water well testing is also called well testing. Well testing is an important testing method for understanding the production capacity of wells and studying reservoir parameters and reservoir dynamics. At present, there are many types of oil reservoirs in oil fields, and the reservoir physical properties vary greatly. The contradictions between layers are more prominent. Layered management has become an important means for oil fields to improve their utilization and recovery rates. In this process, understanding the physical properties of each layer and the oil-water relationship between oil and water wells is one of the main contents of providing data basis for oil field development and construction and adjusting the oil-water relationship. When testing oil field water wells, a blowout preventer plug for pressure differential sealing test is required. However, the blowout preventer plug currently used has only one overflow port. When the downhole pressure is high during the test, the downhole liquid is still easy to spray from the top of the blowout preventer plug, thereby causing environmental pollution. Therefore, we propose a blowout preventer plug for pressure differential sealing test to solve the above problems. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In view of the deficiencies in the prior art, the present invention provides a blowout prevention plug for pressure differential sealing testing, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A blowout preventer plug for pressure differential sealing test includes a main body, the internal thread of the main body is connected to a cylinder, a limit ring is fixed inside the cylinder, a sealing packing is provided on the top of the limit ring, the internal thread of the cylinder is connected to a packing pressure cap, the bottom end of the packing pressure cap is fitted with the top of the sealing packing, and the internal thread of the packing pressure cap is connected to a blowout preventer assembly.

[0007] Furthermore, the blowout prevention assembly includes a first guide shell threadedly connected to the inside of the packing pressure cap, the internal thread of the first guide shell is connected to the second guide shell, and annular tubes are provided on the outside of the first guide shell and the second guide shell. Four drainage tubes are connected and fixed on the annular tubes, one end of the four drainage tubes below are connected and fixed to the first guide shell, and one end of the four drainage tubes above are connected and fixed to the second guide shell, and a drainage pipe is connected and fixed on the two annular tubes.

[0008] Furthermore, the first guide shell and the second guide shell are both fixed with connecting blocks in an annular array inside, and baffles are fixed on the tops of the four connecting blocks on the same plane.

[0009] Furthermore, the internal thread of the second flow guide shell is connected with a sealing head.

[0010] Furthermore, one end of the drainage pipe is connected and fixed with a joint, and a surface of the joint is provided with threads.

[0011] Furthermore, a hexagonal rotating block is fixed to the outer wall of the cylinder.

[0012] Compared with the prior art, the present invention provides a blowout prevention plug for pressure differential sealing testing, which has the following beneficial effects:

[0013] The utility model provides a main body, a cylinder, a limiting ring, a sealing packing, a packing pressure cap and a blowout prevention component. When using this blowout prevention plug for pressure differential sealing testing, the provided blowout prevention component can achieve double blocking and collection of overflowing oil and water liquid, and the collected liquid can be automatically discharged to the interior of the liquid collection tank, thereby preventing the oil and water liquid from spraying out from the top of the plug. At the same time, with the cooperation of the cylinder and the limiting ring, after the packing pressure cap is removed at a later time, the sealing packing can be taken out from the interior of the main body by rotating the cylinder, thereby facilitating its replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a cross-sectional view of the overall structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the limit ring of the utility model.

[0017] In the figure: 1. Main body; 2. Cylinder; 3. Limiting ring; 4. Sealing packing; 5. Packing pressure cap; 6. Blowout prevention assembly; 601. First guide shell; 602. Second guide shell; 603. Annular pipe; 604. Drainage pipe; 605. Drain pipe; 606. Connecting block; 607. Baffle; 7. Sealing head; 8. Connector; 9. Hexagonal rotating block. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0019] like Figure 1 、 Figure 2 and Figure 3 As shown, an embodiment of the present invention proposes a blowout prevention plug for pressure differential sealing test, including a main body 1, the internal thread of the main body 1 is connected to a cylinder 2, the outer wall of the cylinder 2 is fixed with a hexagonal rotating block 9, which is more convenient when the cylinder 2 is rotated and separated from the main body 1, the internal fixed limit ring 3 of the cylinder 2, the top of the limit ring 3 is provided with a sealing packing 4, the internal thread of the cylinder 2 is connected to a packing pressure cap 5, the bottom end of the packing pressure cap 5 is fitted with the top of the sealing packing 4, the internal thread of the packing pressure cap 5 is connected to the blowout prevention component 6, using this When using a blowout prevention plug, as shown in the figure, the plug is provided with a wire hole as a whole. One end of the electric winch wire can be passed through the top of the plug and out from the bottom, and then the logging instrument can be connected. At this time, the logging instrument can be placed in the wellhead blowout preventer, and then the main body 1 is connected to the blowout preventer. Then the electric winch is started and the logging instrument is slowly lowered. During the process of lowering the logging instrument, when the pressure in the well is high, the oil and water liquid will move upward along the wire and overflow, and the blowout prevention component 6 can block and collect the overflowing oil and water liquid, thereby avoiding the situation where the plug will cause oil and water liquid to spray out.

[0020] like Figure 1 and Figure 2 As shown, in some embodiments, the blowout prevention assembly 6 includes a first guide shell 601 threadedly connected to the inside of the packing pressure cap 5, the internal thread of the first guide shell 601 is connected to the second guide shell 602, and the internal thread of the second guide shell 602 is connected to the sealing head 7, which can block the top of the second guide shell 602 to prevent oil and water from splashing from here. The outside of the first guide shell 601 and the second guide shell 602 are both provided with an annular tube 603, and four drainage pipes 604 are connected and fixed on the annular tube 603. One end of the four drainage pipes 604 at the bottom is connected and fixed to the first guide shell 601, and one end of the four drainage pipes 604 at the top is connected and fixed to the second guide shell 602. A drainage pipe 605 is connected and fixed on the two annular tubes 603, and the interiors of the first guide shell 601 and the second guide shell 602 are both fixed with connecting blocks 606 in an annular array. , a baffle 607 is fixed on the top of the four connecting blocks 606 on the same plane. When in use, after the oil and water follow the steel wire into the interior of the first guide shell 601 that moves upward, the first guide shell 601 and the baffle 607 can block the oil and water liquid once, and the oil and water liquid inside the first guide shell 601 will flow from the drainage pipe 604 below to the annular pipe 603 below, and finally flow to the drain pipe 605. Then part of the oil and water liquid will move up along the steel wire to the interior of the second guide shell 602 again. At this time, the second guide shell 602 and its internal baffle 607 can block the oil and water liquid again. Finally, the oil and water liquid inside the second guide shell 602 will flow through the upper drainage pipe 604 to the upper annular pipe 603, and will be discharged from the drain pipe 605 as well, thereby preventing the oil and water liquid from spraying from the top of the plug.

[0021] like Figure 1 As shown, in some embodiments, one end of the drain pipe 605 is connected and fixed with a connector 8, and a thread is provided on the surface of the connector 8, which facilitates the connection and fixation of the drain pipe 605 with the tank pipe for collecting overflow oil and water.

Claims

1. A blowout prevention plug for pressure differential sealing testing, comprising a main body (1), characterized in that: The main body (1) is internally threadedly connected to a cylinder (2), a limiting ring (3) is fixed inside the cylinder (2), a sealing packing (4) is provided on the top of the limiting ring (3), the cylinder (2) is internally threadedly connected to a packing pressure cap (5), the bottom end of the packing pressure cap (5) is fitted with the top of the sealing packing (4), the packing pressure cap (5) is internally threadedly connected to a blowout prevention assembly (6), the blowout prevention assembly (6) comprises a first guide shell (601) threadedly connected to the inside of the packing pressure cap (5), the first guide shell (601) is internally threadedly connected to a second guide shell (602 ... ) and the outer sides of the second flow guide shell (602) are provided with an annular tube (603), and four drainage tubes (604) are connected and fixed on the annular tube (603), one end of the four drainage tubes (604) at the bottom is connected and fixed to the first flow guide shell (601), and one end of the four drainage tubes (604) at the top is connected and fixed to the second flow guide shell (602), and a drainage tube (605) is connected and fixed on the two annular tubes (603), and the interiors of the first flow guide shell (601) and the second flow guide shell (602) are fixed with connecting blocks (606) in an annular array, and baffles (607) are fixed on the tops of the four connecting blocks (606) on the same plane.

2. The blowout preventer plug for pressure differential sealing test according to claim 1, characterized in that: The second flow guide shell (602) is internally threadedly connected to a sealing head (7).

3. The blowout preventer plug for pressure differential sealing test according to claim 1, characterized in that: One end of the drainage pipe (605) is connected to and fixed with a joint (8), and a thread is provided on the surface of the joint (8).

4. The blowout preventer plug for pressure differential sealing test according to claim 1, characterized in that: A hexagonal rotating block (9) is fixed to the outer wall of the cylinder (2).

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