Novel split type pressure test plug

Abstract

The utility model discloses a novel split type pressure test plug, which belongs to the field of petroleum well completion and comprises an upper pressure test plug body, a lower pressure test plug body and a drill rod in threaded connection with the upper pressure test plug body. An NPT plug is arranged in the middle of the pressure test plug upper body, and four lifting screws are arranged at the bottom of the pressure test plug upper body; the bottom of the pressure test plug lower body is provided with a sealing piece, the top of the pressure test plug lower body is provided with a circle of lifting lugs, and the four vertical grooves are uniformly distributed near the lifting lugs; when the shear ram pressure test is carried out, the lower body of the pressure test plug does not come out of a well, and the blowout preventer group is completely isolated from the sleeve during the pressure test, so that the test can be carried out according to the rated working pressure of the shear ram blowout preventer during the pressure test without considering the internal pressure resistance strength of the sleeve, and whether the pressure bearing capacity of the shear ram blowout preventer reaches the standard or not can be determined by utilizing the tool; and the well control safety of well drilling and completion operation of petroleum engineering is further ensured.

Description

Technical Field

[0001] This utility model relates to a test pressure plug, and more particularly to a novel split-type test pressure plug. Background Technology

[0002] During drilling and completion operations in petroleum engineering, well control safety must be ensured. After reinstalling the wellhead blowout preventer assembly, replacing wellhead equipment parts, or after a certain period of time, the blowout preventer assembly must be pressure tested according to the corresponding standards to ensure the safety and effectiveness of the well control device. Generally, the blowout preventer assembly is pressure tested using a drill pipe-feed pressure test plug.

[0003] When using a conventional drill pipe-feed test plug to pressure test the blowout preventer (BOP) assembly, the test plug assembly is typically placed into the BOP assembly using drill pipe until it rests on the load-bearing step of the casing head or tubing crossover. Then, the annular BOP, upper gate BOP, variable diameter gate BOP, and lower gate BOP are closed sequentially and pressure tested. Afterward, the test plug is removed, the shear gate BOP is closed, and the casing and shear gate BOP are pressure tested. Due to the casing's internal pressure resistance limitations, the test pressure value for commonly used 9-5 / 8" and 7" casings is generally required not to exceed 20 MPa. Therefore, for shear gates with a rated working pressure above 20 MPa, if the actual test pressure value does not meet the standard, it cannot be determined whether the BOP can withstand its rated pressure. Utility Model Content

[0004] The purpose of this invention is to provide a novel split-type pressure test plug to solve the problem that when the casing pressure test value is higher than 20MPa, the conventional drill pipe feeding pressure test plug cannot determine whether the blowout preventer can withstand its rated pressure value.

[0005] To achieve the above objectives, the specific plan is as follows:

[0006] A novel split-type pressure test plug includes: an upper body of the pressure test plug, a lower body of the pressure test plug, and a drill rod threadedly connected to the upper body of the pressure test plug; an NPT plug is installed in the middle of the upper body of the pressure test plug, and four lifting screws are provided at the bottom.

[0007] The bottom of the test plug is equipped with a sealing element, and the top of the test plug is equipped with a ring of lifting lugs. Four vertical grooves are evenly distributed near the lifting lugs.

[0008] Furthermore, the sealing element is an O-ring.

[0009] In summary, the present invention has the following advantages over the prior art:

[0010] This invention designs a novel split-type pressure test plug, which differs from the conventional drill rod insertion type integral pressure test plug. This pressure test plug is divided into two parts: an upper body and a lower body, and can be released by rotating the inserted drill rod.

[0011] Since the test plug is not brought out of the well during the shear gate pressure test, and the blowout preventer assembly is completely isolated from the casing during the test, the test can be conducted according to the rated working pressure of the shear gate blowout preventer without considering the internal pressure resistance of the casing. This tool can be used to determine whether the pressure-bearing capacity of the shear gate blowout preventer meets the standard, so as to further ensure the well control safety of drilling and completion operations in petroleum engineering. Attached Figure Description

[0012] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of the present invention after it has been released from the hand;

[0014] Figure 2 This is a schematic diagram of the present invention before it is released from the hand.

[0015] The above figures include the following reference numerals:

[0016] 1. Drill pipe; 2. Upper body of test plug; 3. Threaded parts; 4. NPT plug; 5. Lifting screw; 6. Lifting lug; 7. Vertical groove; 8. Lower body of test plug; 9. Seal. Detailed Implementation

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form may also include the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0020] See Figure 1 and Figure 2 As shown, this utility model provides a novel split-type pressure test plug, including an upper pressure test plug body 2, a lower pressure test plug body 8, and a drill rod 1 threadedly connected to the upper pressure test plug body 2; an NPT plug 4 is installed in the middle of the upper pressure test plug body 2, and four lifting screws 5 are provided at the bottom of the upper pressure test plug body 2. In use, if pressure is applied from inside the drill rod 1, the NPT plug 4 is removed.

[0021] The top of the lower body 8 of the pressure test plug is provided with a ring of lifting lugs 6, and four vertical grooves 7 are evenly distributed near the lifting lugs 6. Through the cooperation of the lifting lugs 6, the vertical grooves 7 and the lifting screws 5, the connection and separation of the upper body 2 and the lower body 8 of the pressure test plug can be realized. The bottom of the lower body 8 of the pressure test plug is equipped with a sealing element 9. During the pressure test, the lower body 8 of the pressure test plug is placed on the load-bearing step of the casing head or the oil pipe cross. The sealing element 9 cooperates with the sealing surface inside the load-bearing step to achieve a seal.

[0022] As a preferred option, seal 9 is an O-ring.

[0023] The steps for using this device are as follows:

[0024] (1) Before entering the well, connect the upper body 2 of the pressure test plug to the drill pipe 1, put the lifting screw 5 at the bottom of the upper body 2 of the pressure test plug into the vertical groove 7 at the top of the lower body 8 of the pressure test plug, and rotate it clockwise by 1 / 8 turn to connect the upper body 2 of the pressure test plug and the lower body 8 of the pressure test plug. Then apply grease evenly to the sealing part 9 of the lower body 8 of the pressure test plug;

[0025] (2) Completely remove all set screws from the casing head or tubing tee;

[0026] (3) Slowly place the test plug assembly into the blowout preventer assembly until it is placed on the load-bearing step of the casing head or tubing cross.

[0027] (4) Open the casing head or the four-way wing valve of the tubing, and close the annular blowout preventer, the upper gate blowout preventer, the variable diameter gate blowout preventer and the lower gate blowout preventer in sequence and perform a pressure test.

[0028] (5) Rotate the drill pipe 1 counterclockwise by 1 / 8 turn to separate the upper body 2 of the pressure test plug from the lower body 8 of the pressure test plug. Then lift the drill pipe 1 and the upper body 2 of the pressure test plug upwards together, leaving the lower body 8 of the pressure test plug inside the casing head or tubing cross.

[0029] (6) Close the blowout preventer of the shear gate and test the shear gate according to the pressure test standard;

[0030] (7) Use drill rod 1 to slowly insert the upper body 2 of the test plug into the casing four-way until the tool stops and continues to be inserted. When the lifting screw 5 of the upper body 2 of the test plug contacts the upper surface of the lower body, rotate the drill tool clockwise until the drill rod 1 falls off; when the lifting screw 5 has entered the vertical groove 7 of the lower body 8 of the test plug, rotate the drill tool clockwise 1 / 8 turn to connect the lifting screw 5 of the upper body 2 of the test plug with the lifting lug 6 of the lower body 8 of the test plug;

[0031] (8) Lift up the recovery test pressure plug assembly;

[0032] (9) After the blowout preventer assembly pressure test is completed, close the casing head or the four-way valve of the oil pipe and tighten all the set screws again.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0035] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel split-type test plug, characterized in that, include: The test plug upper body (2), the test plug lower body (8), and the drill rod (1) threadedly connected to the test plug upper body (2); the test plug upper body (2) is equipped with an NPT plug (4) in the middle position and four lifting screws (5) at the bottom position; The bottom of the test plug lower body (8) is provided with a sealing element (9), and the top of the test plug lower body (8) is provided with a ring of lifting lugs (6). Four vertical grooves (7) are evenly distributed near the lifting lugs (6).

2. The novel split-type test plug according to claim 1, characterized in that, The sealing element (9) is an O-ring.

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