Front guiding same-trace step-by-step well expanding device
By designing a step-by-step expansion device for the front-guided guide head in the drilling equipment, the problem of the drill bit deviating from the trajectory during the expansion process is solved, and the stability and trajectory control of the drill bit are achieved, ensuring the same-trajectory effect after the expansion is achieved.
Patent Information
- Application Number
- CN202510036443.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-04-22
AI Technical Summary
During the drilling operation, the drill bit may deviate from the original trajectory due to geological reasons or construction errors, especially when the original drilling hole is arc-shaped, it is difficult to achieve the same-track expansion.
A front-oriented homologous stepwise expansion device is designed, including a drill bit body and a guide head. The guide head is in the shape of a round table and is fixedly connected to the cutting part of the drill bit body to guide the drill bit to move stably in the drill hole.
Through the design of the guide head, the drill bit is more stable during the hole expansion process, which can effectively control the trajectory, reduce the risk of offset, and ensure that the trajectory after the expansion is the same as the original drilling hole.
Smart Images
Figure CN119860141A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of drilling equipment, and in particular to a front-guided same-track step-by-step well expansion device. Background Art
[0002] In drilling operations, "well expansion" refers to the process of expanding the diameter of a specific section in an existing wellbore. The purpose of well expansion is usually to meet the needs of subsequent operations, such as installing larger diameter casing, increasing the productivity of the wellbore, and solving problems caused by narrow wellbore. However, during the well expansion process, the drill bit trajectory may deviate from the circular hole position due to geological reasons, lithology changes, rock quality changes, construction errors, etc. At the same time, if the trajectory of the original borehole is an arc, the drill bit's hole expansion trajectory will deviate from the original borehole and cannot reach the same track during well expansion. Summary of the invention
[0003] The present invention aims to provide a front-guided same-track step-by-step well expansion device to solve the problem of trajectory deviation caused by drill bit deviation during well expansion.
[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a front-guided same-track step-by-step well expansion device, comprising a drill bit body and a guide head, the drill bit body comprising a cutting part and a connecting part, the guide head being fixedly connected to the cutting part, and the guide head being used to guide the drill bit body to move along the aperture of the borehole to expand the well when the drill bit body is expanding the borehole.
[0005] Furthermore, the guide head is in a truncated cone shape, and the end of the guide head with a larger diameter is fixedly connected to the cutting part.
[0006] Furthermore, the length of the guide head is 10 to 20 cm.
[0007] Furthermore, the diameter of the smaller end of the guide head is 110-180 mm.
[0008] Furthermore, the guide head and the cutting part are formed by welding at one time.
[0009] Working principle and beneficial effects of the present invention:
[0010] Before use, the drill bit body is connected to the drill pipe through the connecting part. When expanding the well, the guide head is inserted into the borehole that needs to be expanded. Since the guide head is truncated cone-shaped, the guide head can be easily inserted into the rotating hole. Then the drilling rig transmits power to the drill pipe through the rotary drive. The drilling hole transmits power to the drill bit body to drive the drill bit body to rotate. When the drill bit body rotates, the cutting part cuts the rock. At the same time, the drill pipe applies a certain axial force to the drill bit body to push the drill bit body forward. As the drill bit body rotates and advances, the conical design of the truncated cone-shaped guide head makes the lateral force generated during the advancement process smaller, which helps to maintain the stability of the drill bit and makes it less likely for the drill bit to deviate from the original trajectory. The guide head adopts a length of 10 to 20 cm, which provides a good guiding effect for the drill bit body during the expansion process, ensuring that the drill bit body moves along the original drilling trajectory, while avoiding the risk of the guide head being too long and increasing the risk of fracture. If the trajectory deviates during the expansion process, the guide head at the front end will hold the borehole wall to make the drill bit suspended and unable to continue to expand the well to avoid trajectory deviation.
[0011] 1. This solution makes the drill bit more stable during the hole expansion process through the design of the truncated cone guide head, which can better control the trajectory of the drill bit, reduce the possibility of re-drilling due to deviation, and ensure that the well expansion is completed with the same trajectory as the original drill hole.
[0012] 2. The design of the frustum-shaped guide head makes the drill bit more stable during the hole expansion process, reducing the risk of accidents caused by drill bit swing. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of an embodiment of a front-guided same-track step-by-step well expansion device of the present invention;
[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the middle guide head. DETAILED DESCRIPTION
[0015] The following is further described in detail through specific implementation methods:
[0016] The reference numerals in the drawings of the specification include: connecting rod 1, cutting portion 2, gear 3, guide head 4, spline 5.
[0017] The embodiment is basically as shown in the attached Figure 1 As shown:
[0018] A front-guided, same-track, step-by-step well expansion device comprises a drill bit body and a guide head 4, the drill bit body comprises a cutting portion 2 and a connecting portion, the connecting portion comprises a connecting rod 1, the connecting rod 1 is coaxially fixedly connected to the cutting portion 2, a spline 5 is provided on the connecting rod 1, the guide head 4 is fixedly connected to the side of the cutting portion 2 facing away from the connecting rod 1, and the side of the cutting portion 2 fixedly connected to the guide head 4 is fixedly connected to two circles of a plurality of cones 3 arranged in an annular array, the two circles of cones 3 surround the guide head 4, the guide head 4 is truncated, and the end of the guide head 4 with a larger diameter is welded to the cutting portion 2 at one time. The length of the guide head 4 is 10 to 20 cm, and the diameter of the end of the guide head 4 with a smaller diameter is 110 to 180 mm.
[0019] The specific implementation process is as follows:
[0020] Before use, the drill bit body is connected to the drill rod through the connecting part. When expanding the well, the guide head 4 is inserted into the borehole that needs to be expanded. Since the guide head 4 is truncated cone-shaped, the guide head 4 can be easily inserted into the rotating hole. Then the drilling rig transmits power to the drill rod through the rotary driver, and the drilling hole transmits power to the drill bit body to drive the drill bit body to rotate. When the drill bit body rotates, the cutting part 2 cuts the rock, and the drill rod applies a certain axial force to the drill bit body to push the drill bit body forward. With the rotation and advancement of the drill bit body, the conical design of the truncated cone-shaped guide head 4 makes the lateral force generated during the advancement process smaller, which helps to maintain the stability of the drill bit and makes it difficult for the drill bit to deviate from the original trajectory. The guide head 4 adopts a length of 10 to 20 cm, which provides a good guiding effect for the drill bit body during the well expansion process, ensuring that the drill bit body moves along the original drilling trajectory, while avoiding the risk of the guide head 4 being too long and increasing the risk of fracture. If the trajectory deflects during the well expansion process, the guide head 4 at the front end will resist the borehole wall so that the drill bit is suspended and cannot continue to expand the well to avoid trajectory deflection. When expanding the well step by step, the drill bit body and guide head with larger size are replaced step by step during the first, second and third openings.
Claims
1. A front-guided same-track step-by-step well expansion device, characterized in that: The drill bit comprises a drill body and a guide head, wherein the drill body comprises a cutting part and a connecting part, the guide head is fixedly connected to the cutting part, and the guide head is used for guiding the drill body to move along the borehole diameter to expand the borehole when the drill body expands the borehole.
2. A front-guided same-track step-by-step well expansion device according to claim 1, characterized in that: The guide head is in a truncated cone shape, and the end of the guide head with a larger diameter is fixedly connected to the cutting part.
3. A front-guided same-track step-by-step well expansion device according to claim 2, characterized in that: The length of the guide head is 10 to 20 cm.
4. A front-guided same-track step-by-step well expansion device according to claim 3, characterized in that: The diameter of the smaller end of the guide head is 110-180 mm.
5. The front-guided same-track step-by-step well expansion device according to claim 4, characterized in that: The guide head and the cutting part are formed by welding at one time.