Novel well killing tool and process

Abstract

The invention discloses a novel well killing tool and process, and belongs to the technical field of well drilling engineering, and the novel well killing tool comprises a well killing tool pup joint, a large-size combined drilling tool, a small-size combined drilling tool and a small-size drilling tool adapter substitute, the small-size combined drilling tool sequentially penetrates through the large-size combined drilling tool to reach the well killing tool pup joint and is set with the well killing tool pup joint, and the upper end of the small-size combined drilling tool is connected with the upper end of the large-size combined drilling tool through the drilling tool adapter substitute. The method is high in adaptive capacity and convenient to operate, can effectively avoid inconvenience caused by well killing through a traditional driller method and an engineer method, guarantees safety of the whole well killing process to the maximum extent, can effectively avoid high casing pressure events occurring in the well killing process, can start the well killing process immediately once well control dangerous cases occur and a well mouth is successfully controlled, and improves well control safety. A small-size drilling tool is tripped into the drilling tool water hole to be connected with the well killing tool pup joint in the lower drilling tool assembly, and then well killing operation can be carried out.

Description

Technical Field

[0001] The invention belongs to the technical field of drilling engineering, and in particular relates to a new well killing tool and process. Background Art

[0002] The exploration and development of oil and gas is a multidisciplinary and multi-category systematic project. There are risks in every link. Once a problem occurs in a link, the impact is unprecedented, especially in drilling projects. In recent years, with the gradual recovery of the oil and gas industry, the number of drillings has also increased year by year, especially deep unconventional drilling, which has emerged as a new force and occupied half of the conventional market. Tight oil and gas, shale oil and gas, etc. will become the main energy sources in my country in the future. However, the development of deep oil and gas is often accompanied by risks, especially overflow and well kick problems in drilling projects. Once overflow and well kick occur, the most direct action is to shut down the well. However, after shutting down the well, the overflow in the well will not disappear by itself, but it needs to be treated by traditional methods such as driller method and engineer method to eliminate the overflow and re-establish the pressure balance in the well. Otherwise, deeper oil and gas will not be developed, which will lead to no production and no benefits in drilling wells. In this way, the energy rice bowl will not be secure. However, the traditional driller method and engineer method are complicated and difficult to master. Even if they are mastered, a slight mistake will result in an embarrassing situation where the casing pressure increases, thereby increasing the risk of well control and the uncontrollability of the risk. Therefore, how to deal with the well killing problem after the well is shut down due to overflow and well kick more efficiently, quickly and simply has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to solve the above-mentioned problems, the present invention proposes: a new type of well killing tool, including a well killing tool short-circuit, a large-size combined drill tool, a small-size combined drill tool, and a small-size drill tool conversion joint. The lower end of the large-size combined drill tool is connected to the well killing tool short-circuit, and the small-size combined drill tool passes through the large-size combined drill tool in sequence to the well killing tool short-circuit and is sealed with the well killing tool short-circuit. The upper end of the small-size combined drill tool is connected to the upper end of the large-size combined drill tool through the drill tool conversion joint.

[0004] Furthermore, the large-size combined drilling tool is composed of a plurality of large-size drilling tools, and the plurality of large-size drilling tools are connected in sequence.

[0005] Furthermore, the small-size combined drilling tool is composed of a plurality of small-size drilling tools, and the plurality of small-size drilling tools are connected in sequence.

[0006] Furthermore, the lower end of the small-sized combined drilling tool is a small-sized drilling tool joint with a stabilizer.

[0007] Furthermore, a one-way valve is arranged at the lower end of the small-sized drill tool joint with the centralizer.

[0008] Furthermore, the lower part of the inner tube of the drill tool conversion joint is connected to the upper end of the small-sized combined drill tool, and the lower part of the outer tube of the drill tool conversion joint is connected to the upper end of the large-sized combined drill tool.

[0009] Furthermore, the upper end of the inner tube of the drill tool conversion joint is tightly connected to the upper end of the outer tube of the drill tool conversion joint.

[0010] A new well-killing technology is used. During the drilling process, a well-killing tool is added. When overflow or well kick occurs, the blowout preventer at the wellhead is closed and the vertical pressure is zero, the wellhead drill pipe is removed, and a small-sized combined drill tool is lowered along the water hole of the drill pipe. During the lowering process, the small-sized combined drill tool is filled with weighted drilling fluid. After the small-sized combined drill tool is short-circuited to the well-killing tool, the small-sized combined drill tool is connected to the bottom of the well. The ground pumps the weighted drilling fluid into the small-sized combined drill tool in the well to kill the well.

[0011] The beneficial effects of the present invention are as follows: the present invention will conveniently and quickly solve the well-killing problem in the oil industry. The new well-killing tool and process have strong adaptability and are easy to operate. They can effectively avoid the inconvenience caused by the traditional well-killing methods of drillers and engineers, and guarantee the safety of the entire well-killing process to the greatest extent. They can effectively avoid high casing pressure events that occur during the well-killing process. Once a well control hazard occurs, after the wellhead is successfully controlled (it is imperative to ensure that the shut-in vertical pressure is zero), the well-killing process can be immediately started, a small-sized drill bit can be lowered into the drill bit water hole, and short-circuited with the well-killing tool in the lower drill bit assembly to achieve connection, and then the well-killing operation can be carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the short circuit of the well killing tool of the present invention;

[0013] Figure 2 It is a schematic diagram of a small-sized drilling tool;

[0014] Figure 3 It is a schematic diagram of a small-sized drilling tool joint (with a centralizer);

[0015] Figure 4 Schematic diagram of drilling tool conversion joint. DETAILED DESCRIPTION

[0016] In order to make the technical means and objectives of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. A new well killing tool, such as Figure 1As shown, it includes a well-killing tool short-circuit, a large-size combined drill tool, a small-size combined drill tool, and a small-size drill tool conversion joint. The lower end of the large-size combined drill tool is connected to the well-killing tool short-circuit, and the small-size combined drill tool passes through the large-size combined drill tool in sequence to the well-killing tool short-circuit and is sealed with the well-killing tool short-circuit. The upper end of the small-size combined drill tool is connected to the upper end of the large-size combined drill tool through a drill tool conversion joint.

[0017] Wherein, the large-size combined drilling tool is composed of a plurality of large-size drilling tools, and the plurality of large-size drilling tools are connected in sequence.

[0018] Among them, Figure 2 As shown, the small-size combined drilling tool is composed of a plurality of small-size drilling tools, and the plurality of small-size drilling tools are connected in sequence.

[0019] Wherein, the lower end of the small-size combined drilling tool is a small-size drilling tool joint with a stabilizer.

[0020] Wherein, a one-way valve is arranged at the lower end of the small-sized drill bit joint with a centralizer, such as Figure 3 shown.

[0021] Among them, Figure 4 As shown, the lower part of the inner tube of the drill tool conversion joint is connected to the upper end of the small-sized combined drill tool, and the lower part of the outer tube of the drill tool conversion joint is connected to the upper end of the large-sized combined drill tool.

[0022] Wherein, the upper end of the inner tube of the drill tool conversion joint is tightly connected with the upper end of the outer tube of the drill tool conversion joint.

[0023] A new well-killing technology adds a well-killing tool to the drill bit combination. Once complex situations such as overflow and well kick occur, the wellhead drill pipe is removed and a small-sized drill tool is lowered along the drill pipe water hole under the condition that the well has been safely shut in (the wellhead blowout preventer has been closed and the vertical pressure is zero). The small-sized drill tool is filled with weighted drilling fluid during the lowering process. When the drill tool reaches the bypass valve, it cooperates with the well-killing tool to achieve communication between the small-sized drill tool and the bottom of the well. The weighted drilling fluid is pumped into the well from the ground to achieve the purpose of well-killing.

[0024] Production conditions: shut-in standing pressure is zero;

[0025] Directions:

[0026] After shutting down the well due to overflow, well kick and other complex situations, if the shut-in vertical pressure is zero, this process can be used to carry out well killing operations. The specific usage is as follows:

[0027] First, assemble it. Have professionals handle and assemble it, and ensure that the pipeline is sealed.

[0028] Then, after correctly obtaining the shut-in pressure and calculating the density of the well-killing fluid, remove the drilling plug valve or the blowout prevention column (single blowout prevention column) and lower it into the wellbore. Figure 2 and Figure 3 Combined drilling tools( Figure 3 lie in Figure 2 The lower part goes into the well first. During the drilling process, pay attention to pouring the prepared weighted drilling fluid into the small drill bit. Figure 1 When the wellhead is connected Figure 4 The conversion joint is connected to the normal drilling tool. Then pull up and lower the drilling tool so that Figure 3 Tool entry Figure 1 In, with Figure 1 Achieve seamless docking. After all preparations are completed, the weighted drilling fluid can be pumped in to kill the well.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new well killing tool, characterized in that: It includes a well-killing tool short-circuit, a large-size combined drilling tool, a small-size combined drilling tool, and a small-size drilling tool conversion joint. The lower end of the large-size combined drilling tool is connected to the well-killing tool short-circuit, and the small-size combined drilling tool passes through the large-size combined drilling tool in sequence to the well-killing tool short-circuit and is sealed with the well-killing tool short-circuit. The upper end of the small-size combined drilling tool is connected to the upper end of the large-size combined drilling tool through a drilling tool conversion joint.

2. The new well killing tool according to claim 1, characterized in that: The large-size combined drilling tool is composed of a plurality of large-size drilling tools, and the plurality of large-size drilling tools are connected in sequence.

3. The new well killing tool according to claim 1, characterized in that: The small-size combined drilling tool is composed of a plurality of small-size drilling tools, and the plurality of small-size drilling tools are connected in sequence.

4. The new well killing tool according to claim 1, characterized in that: The lower end of the small-size combined drilling tool is a small-size drilling tool joint with a centralizer.

5. The new well killing tool according to claim 4, characterized in that: A one-way valve is arranged at the lower end of the small-sized drill tool joint with the centralizer.

6. The new well killing tool according to claim 1, characterized in that: The lower part of the inner tube of the drilling tool conversion joint is connected to the upper end of the small-sized combined drilling tool, and the lower part of the outer tube of the drilling tool conversion joint is connected to the upper end of the large-sized combined drilling tool.

7. The new well killing tool according to claim 6, characterized in that: The upper end of the inner tube of the drilling tool conversion joint is tightly connected with the upper end of the outer tube of the drilling tool conversion joint.

8. A new well killing process, characterized in that: When a well-killing tool is added during the drilling process and overflow or well kick occurs, under the condition that the well has been safely shut in: the wellhead blowout preventer has been closed, the vertical pressure is zero, the wellhead drill pipe is removed, and a small-sized combined drill tool is lowered along the drill pipe water hole. During the lowering process, the small-sized drill tool is filled with weighted drilling fluid, and the small-sized combined drill tool is short-circuited to the well-killing tool to achieve communication between the small-sized combined drill tool and the bottom of the well. The ground will pump the weighted drilling fluid into the small-sized combined drill tool in the well to achieve well killing.

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