Bypass valve tool for well cementation
By designing the bypass valve tool for cementing, the problem of leakage of weak pressure formations during cementing is solved, and the cementing quality is improved and the safety and efficiency of completion operations are achieved.
Patent Information
- Application Number
- CN202420889108.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-04-26
AI Technical Summary
During the cementing process, weak pressure-bearing formations are prone to leakage, resulting in poor cementing quality and affecting later production. The prior art solves this problem by cementing the well without pressure and adjusting the density of the cement slurry, but there are still problems such as difficult to determine the formation pressure coefficient and high cementing cost.
A bypass valve tool for cementing is designed, including a press-fit seat assembly connected to the lower part of the casing string and a bypass valve body connected to the press-fit seat assembly. The bypass valve is equipped with a pitching ball seat and a pitching ball. Through the push of the pitching, the bypass valve can be opened before or during the cementing process to realize the bypass circulation of fluid, solve the leakage problem, and realize the pressure of the rubber plug after cementing through the pressure seat assembly.
Through the use of bypass valve tools, the formation pressure bearing capacity can be improved before cementing, prevent leakage, ensure cementing quality, shorten completion operation time, improve the safety of completion operation, and achieve safe and efficient development of complex structure oil and gas wells.
Smart Images
Figure CN222731524U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a downhole tool for a petroleum exploration well in the field of geological exploration drilling tools, in particular to a bypass valve tool for cementing, belonging to the technical field of geological exploration drilling tools. Background Art
[0002] After drilling, the oil and gas wells enter the completion operation, which requires the lowering of production casing and the establishment of an oil and gas production channel. Under normal circumstances, the production casing string structure from bottom to top is: float shoe + 2 casings + float collar + casing string + joint joint. In order to ensure the safety and quality of cementing in complex wells such as horizontal wells and extended reach wells, a float collar will be added to the casing string, and a double support collar structure will be adopted: float shoe + 1 short casing + float collar 1# + 1 short casing + float collar 2# + casing string (centralizer) + joint joint.
[0003] Since the density of cement slurry is higher than that of drilling fluid, a formation pressure test needs to be carried out before cementing. However, the risk of leakage in weak pressure-bearing formations is high, and leakage occurs during the cementing process, making it difficult to carry out plugging work, which can easily lead to poor cementing quality and affect subsequent production.
[0004] In the prior art, cementing is generally achieved by cementing without pressure and adjusting the slurry injection structure of the cementing cement slurry to reduce the equivalent density of the weak formation. This method can partially solve the cementing problem of weak formations, but there are still two problems: on the one hand, it is difficult to determine the formation pressure coefficient and the equivalent density of the cementing cement slurry; on the other hand, to reduce the density of the cementing cement slurry, it is necessary to adjust the cement slurry system formula and increase low-density materials, which greatly increases the cementing cost. Summary of the invention
[0005] The technical problem to be solved by the utility model is to provide a cementing bypass valve tool which can improve the pressure bearing capacity of the formation, thereby ensuring the safety of the completion operation and effectively shortening the completion operation time, and realizing the safe and efficient development of oil and gas wells with complex structures.
[0006] In order to solve the above technical problems, the utility model of a bypass valve tool for cementing comprises a bumping seat assembly connected to the lower part of the casing string and a bypass valve body connected to the bumping seat assembly, the bumping seat assembly has a bumping cavity and a rubber plug can be lowered into the bumping cavity for cementing bumping, a bypass valve hole is arranged on the side wall of the bypass valve body, a pitching ball seat facing the bypass valve hole and a pitching ball that can cooperate with the pitching ball seat are arranged in the bypass valve body, the fluid entering the bumping seat assembly can directly flow through the bypass valve body to the bottom of the well for circulation, and after the pitching ball is put into the pitching ball seat, the bypass valve body can be opened so that the fluid can circulate through the bypass valve hole.
[0007] The impact seat assembly is connected to the bypass valve body through threads.
[0008] The length of the bypass valve body is 430 mm, the aperture of the bypass valve body is 30 mm, the diameter of the pitching ball is 57 mm, and the inner diameter of the pitching ball seat is 48 mm.
[0009] The pitching ball is a steel ball.
[0010] The length of the impact seat assembly is 405 mm.
[0011] The inner diameter of the impact and pressure cavity is larger than the outer diameter of the pitching ball.
[0012] The advantages of the utility model are:
[0013] By setting a bump and pressure seat assembly connected to the lower part of the casing string and a bypass valve body connected to the bump and pressure seat assembly, and providing a ball pitching seat facing the bypass valve hole and a ball that can be dropped into the ball pitching seat in the bypass valve body, on the one hand, if leakage occurs before cementing, the leakage can be plugged by opening the bypass valve, thereby improving the pressure-bearing capacity of the formation; on the other hand, the bypass valve and the bump and pressure seat are designed in a coordinated manner without affecting the cementing quality, and cementing bump and pressure are achieved, thereby solving the problems encountered in the circulation process before cementing, such as difficulty in establishing circulation due to formation leakage, pressure plugging, etc., which lead to a long operation cycle, and especially solves the problem that leakage is difficult to plug during cementing in weak pressure formations, thereby achieving safe and efficient cementing and completion operations of oil and gas wells, thereby shortening the completion time, improving the safety of completion operations, and achieving safe and efficient development of oil and gas wells with complex structures. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the assembly state of the bypass valve tool for cementing of the utility model;
[0015] Figure 2 It is a structural schematic diagram of the impact and pressure seat assembly in the utility model;
[0016] Figure 3 It is a structural schematic diagram of the bypass valve body in the utility model. DETAILED DESCRIPTION
[0017] The bypass valve tool for cementing of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementations.
[0018] As shown in the figure, the bypass valve tool for cementing provided by the utility model can be used for casing lowering and cementing operations, and includes a bumping seat assembly 1 connected to the lower part of the casing string and a bypass valve body 2 connected to the bumping seat assembly through a thread, the bumping seat assembly 1 has a bumping cavity 3 and a rubber plug 4 can be lowered into the bumping cavity after the cement slurry is injected, and the bumping of cementing is performed by the rubber plug to avoid cement reflux and ensure the quality of cementing; a bypass valve hole 5 is arranged on the side wall of the bypass valve body 2, and a pitching ball seat 6 facing the bypass valve hole and a pitching ball 7 capable of cooperating with the pitching ball seat are arranged in the bypass valve body 2. As can be seen from the figure, in this embodiment, the length of the bumping seat assembly 1 is 405mm, the length of the bypass valve body 2 is 430mm, the aperture of the bypass valve body 2 is 30mm, and plugging materials can be allowed to pass through, and the pitching ball 7 The diameter is 57mm, and the inner diameter of the pitching ball seat 6 is 48mm. The fluid entering the impact and pressure seat assembly can directly flow through the bypass valve body to the bottom of the well for circulation. The inner diameter of the impact and pressure chamber 3 is larger than the outer diameter of the pitching ball 7. After the pitching ball is thrown in from the outside, the pitching ball can pass through the impact and pressure chamber 3 and then enter the bypass valve body and contact with the pitching ball seat 6, and then the pitching ball 7 is used to push the pitching ball seat 6 downward to make way for the bypass valve hole 5, thereby opening the bypass valve body and allowing the fluid to circulate through the bypass valve hole 5. During specific use, before throwing the ball, the bypass valve is closed, and the fluid can flow normally through the bypass valve body to the bottom of the well for circulation; after throwing the ball, the bypass valve is opened, and the fluid circulates through the bypass valve hole, thereby realizing the bypass circulation before and during cementing through the bypass valve body; and the rubber plug impact after cementing can be realized through the impact and pressure seat assembly.
[0019] When it is applied in operations, for example: used in casing and cementing processes in a φ215.9mm wellbore, the casing string structure recommended for using the tool is: floating shoe + 1 short casing + floating collar 1# + 1 short casing + the utility model cementing bypass valve tool + casing string (centralizer) + joint top joint, that is, the utility model cementing bypass valve tool is connected to the lower part of the casing string, used before cementing and during cementing, the bypass valve body is located at the lower part of the impact seat assembly, the bypass valve body is opened by dropping a ball, and the dropping ball can be opened by the impact seat assembly. Pressure seat assembly; specifically, under normal circumstances, there is no need to drop a ball to open the bypass valve. If the floating collar or other tools at the bottom of the bypass valve fail, resulting in circulation blockage, or formation leakage occurs during the circulation process, the ball is dropped to open the bypass valve, and circulation cementing is established through the bypass valve passage, or plugging operations are carried out to improve the pressure bearing capacity of the formation before cementing. This can meet the pressure bearing and plugging requirements before cementing, as well as the cementing requirements, and realizes effective treatment after leakage before cementing and the requirements of large-volume circulation and cementing before cementing, thereby improving the safety of cementing operations.
[0020] Furthermore, the material of the ball should meet the pressure-bearing requirements for opening the bypass valve, and the rubber plug should meet the pressure requirements for cementing. Therefore, the ball 7 can be a steel ball, and the rubber plug can be made of rubber.
[0021] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.
Claims
1. A bypass valve tool for cementing, characterized in that: The invention comprises a collision and pressure seat assembly (1) connected to the lower part of the casing string and a bypass valve body (2) connected to the collision and pressure seat assembly. The collision and pressure seat assembly (1) has a collision and pressure cavity (3) and a rubber plug (4) can be lowered into the collision and pressure cavity to perform cementing collision and pressure. A bypass valve hole (5) is arranged on the side wall of the bypass valve body (2). A pitching ball seat (6) facing the bypass valve hole and a pitching ball (7) capable of cooperating with the pitching ball seat are arranged in the bypass valve body (2). The fluid entering the collision and pressure seat assembly can directly flow through the bypass valve body to circulate at the bottom of the well. After the pitching ball (7) is dropped into the pitching ball seat (6), the bypass valve body can be opened so that the fluid can circulate through the bypass valve hole (5).
2. The bypass valve tool for cementing according to claim 1, characterized in that: The impact seat assembly (1) is connected to the bypass valve body (2) via threads.
3. The bypass valve tool for cementing according to claim 1 or 2, characterized in that: The length of the bypass valve body (2) is 430 mm, the aperture of the bypass valve body (2) is 30 mm, the diameter of the pitching ball (7) is 57 mm, and the inner diameter of the pitching ball seat (6) is 48 mm.
4. The bypass valve tool for cementing according to claim 3, characterized in that: The pitching ball (7) is a steel ball.
5. The bypass valve tool for cementing according to claim 1, 2 or 4, characterized in that: The length of the impact seat assembly (1) is 405 mm.
6. The bypass valve tool for cementing according to claim 5, characterized in that: The inner diameter of the impact and pressure chamber (3) is larger than the outer diameter of the pitching ball (7).