CN204402425U - A kind of for well-control blowout prevention instrument during setting of casing - Google Patents

Abstract

The utility model relates to a well control and blowout prevention tool used for casing running. The scheme is: a hydraulic channel is arranged in the body, a movable ball valve and a spring are arranged in the body, the ball valve is connected to the spring, and the spring is fixed on the The lower part of the body, the ball valve and the upper part of the body form a sealing fit. The main advantages of this well control blowout prevention tool: First, it can quickly connect the drill pipe and casing, lower the drill pipe to the position of the blowout preventer ram, and then shut down the well to quickly realize the control of the wellhead; Under the permitted preconditions, the drill pipe is forcibly lowered. The utility model has the advantages of simple structure, convenient use, low cost and strong practicability.

Description

A Well Control Blowout Prevention Tool for Running Casing

technical field

The utility model belongs to the field of oil and natural gas drilling tools, in particular to a well control blowout prevention tool in the process of oil and gas downhole casing operation.

Background technique

During oil and gas drilling, formation fluid enters the wellbore to form overflow. Once the overflow is out of control, it will lead to blowout or blowout out of control, and the consequences will be catastrophic. In most cases, overflow occurs during drilling, and overflow also occurs during casing running, which is not conducive to operation safety. In order to prevent overflow and out-of-control during casing running, the current general practice is to replace the BOP ram core that is compatible with the size of the casing before running the casing. This method is time-consuming and laborious, and it is inconvenient and uneconomical to replace; and Once the well is shut in due to overflow, the casing operation cannot be performed forcibly, which is not conducive to the well killing operation and complicates the downhole situation.

Contents of the invention

The purpose of the utility model is to provide a well control blowout prevention tool for casing running in order to meet the needs of well control blowout prevention in casing running.

The technical scheme of the utility model is:

A well control and blowout prevention tool used for casing running. The main body is equipped with a hydraulic channel, and a movable ball valve and spring are arranged in the main body. The ball valve is connected to the spring, and the spring is fixed on the lower part of the main body. The ball valve and the upper part of the main body are formed. Seal fit.

The above solution also includes: the middle section of the hydraulic channel 5 in the body 2 is an enlarged diameter section, and the ball valve 3 is arranged in the enlarged diameter section. Both ends of the body 2 are provided with connecting threaded buckles, the upper end of the body 2 is a female buckle 1, and the lower end is a male buckle 6, both of which are API standard casing threads.

The well control and blowout prevention tool for casing running of the utility model has the following advantages:

1. Once overflow is found, the drill pipe connected with the utility model is connected with the casing in the well through a screw, and the drill pipe is lowered to the position of the blowout preventer ram, and then the well is shut down, so that the wellhead can be controlled quickly. It can meet the casing well control requirements.

2. The casing operation well control method commonly used at present cannot force the casing operation after shutting in the well, which is not conducive to the well killing operation. With the utility model, in the well control of casing running operation, after the well is shut down, the drilling pipe can be forcibly run in according to the situation, which is more conducive to the killing operation and prevents blowout.

3. Before casing operation, there is no need to replace the blowout preventer ram core that is suitable for the size of the casing, just connect the utility model with a drill pipe through a threaded buckle and place it in front of the drill floor gate It can be used as a backup, saving time and effort.

4. The utility model has the advantages of simple structure, convenient use, low cost, recyclable use and strong practicability.

Description of drawings:

Fig. 1 is a schematic diagram of the structure of a well control blowout prevention tool used for casing running.

In the figure: 1. female buckle, 2. body, 3. ball valve, 4. spring, 5. hydraulic channel, 6. male buckle.

Detailed ways

Referring to the accompanying drawing 1, the well control blowout prevention tool when running the casing is composed of a body 2, a hydraulic channel 5, a female button 1, a ball valve 3, a spring 4, and a male button 6. The hydraulic channel 5 runs through the inside of the body 2, and the body 2 There is a box 1 inside the upper end, and the shape of the box 1 is consistent with that of the drill pipe box, and can be directly connected with the make-up of the drill pipe; there is a male button 6 outside the lower end of the body 2, and the button shape of the male button 6 is the same as that of the casing male button Consistent, can be directly connected with the casing buckle. The middle part of hydraulic channel 5 is slightly wider, and spring 4 and ball valve 3 are housed, and ball valve 3 is pushed on the top of the middle part of hydraulic channel 5 under the elastic force of spring 4, and can seal and block hydraulic channel 5, and hydraulic channel 5 is When the ball valve 3 is closed by pressure on the upper part of the hydraulic passage 5, the spring 4 is compressed and the ball valve 3 moves downward, so that the hydraulic passage 5 can be opened.

Before the casing operation, there is no need to replace the blowout preventer ram core, the female buckle 1 of the utility model is tightly connected with the male buckle of a drill pipe, and placed in front of the drill floor gate for standby, during the casing running process , once the overflow is found, the drill pipe connected with the utility model is hoisted to the drill floor, and the male buckle 6 of the utility model is tightly connected with the casing box buckle, and the drill pipe is lowered to the position of the blowout preventer ram, and then After shutting down the well, the ram blocks the drill pipe and seals the annular space between the casing and the wellbore; under the action of the spring 4, the inner ball valve 3 in the casing blocks the hydraulic channel 5, effectively preventing the injection inside the casing , wells are under control. The upper end of the drill pipe is connected with the upper drill pipe or the top drive. After the pump is turned on, under the action of mud pressure, the spring 4 is compressed, the ball valve 3 moves downward, and the hydraulic channel 5 is opened to execute well killing operations. In order to facilitate the well killing operation, the forced drilling operation can be carried out according to the situation. Since the steps of the drill pipe joint are in the shape of a slope, when the universal blowout preventer is installed, the drill pipe can be forcibly lowered, and as much drill pipe can be lowered as possible. The upper end of the drill pipe is connected to the upper drill pipe or top drive, and after the pump is turned on, the well killing operation is carried out.

Claims (3)

1. A well control blowout prevention tool for running casing, characterized in that: the body (2) is provided with a hydraulic channel (5), and the body (2) is provided with a movable ball valve (3) and a spring (4), the ball valve (3) is connected to the spring (4), the spring (4) is fixed on the lower part of the body (2), and the ball valve (3) forms a sealing fit with the upper part of the body (2). 2. The well control blowout prevention tool for running casing according to claim 1, characterized in that: the two ends of the body (2) are provided with connecting thread buckles; the middle section of the hydraulic channel (5) in the body (2) It is a diameter-expanding section, and the ball valve (3) is arranged in the diameter-expanding section. 3. The well control and blowout prevention tool for casing running according to claim 1 or 2, characterized in that: the upper end of the body (2) is a female snap (1), and the lower end is a male snap (6), both of which are API standard casing thread.