Ocean drilling in-situ test footage measurement reference system
By using a floating fixed reference device in offshore drilling, the problem of instability of in-situ test reference objects in offshore drilling is solved, the test accuracy and equipment stability are improved, and efficient in-situ in-situ in unstable environments in sea conditions is achieved test.
Patent Information
- Application Number
- CN202420475188.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-12
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-03-12
AI Technical Summary
In offshore drilling, the use of movable casing as a fixed reference during in-situ testing results in a large error in the accuracy of penetration hits, especially when the surge is large, the error of the drilling platform fluctuations is significantly increased, and the fixed reference is needed to be improved. to improve accuracy.
The floating fixed reference device is adopted, including a guide pipe and a buoyant device, and a buoyant device composed of foam-filled rubber columns and solid rubber columns. It is fixed in the movable sleeve to improve stability and accuracy in combination with the outer expanding cone joint design.
Overcome the impact of sea conditions, improve the accuracy of in-situ test hammer count, ensure the stability and repeatability of the equipment, and reduce the overall weight through material selection and structural design, and extend the service life.
Smart Images
Figure CN222162576U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ocean drilling, in particular to an ocean drilling in-situ test footage measurement reference system. Background Art
[0002] Offshore drilling is a drilling project carried out in the ocean, bay and other sea areas for the purpose of geological exploration. For offshore exploration, the main challenges are drilling ships or drilling platforms, drilling technology, drilling methods, etc. At present, drilling ships can basically adapt to offshore operations, and drilling equipment has also been improved. Offshore drilling rigs suitable for offshore drilling have been developed, and wave compensation systems have been added. However, there are still many problems in the in-situ testing during the drilling process.
[0003] In-situ tests include standard penetration test and cone dynamic penetration test. In the current offshore drilling, most of the in-situ tests are carried out with the borehole casing as a fixed reference object. The casing is divided into movable casing and fixed casing. The movable casing accounts for a large proportion in offshore drilling. The movable casing moves up and down with the rise and fall of the drilling platform. The accuracy error of the penetration count is large, especially when the surge is large, the rise and fall of the drilling platform significantly increases the error. There is room for improvement in the fixed reference objects of the in-situ test. Utility Model Content
[0004] The utility model aims to provide a marine drilling in-situ test footage measurement reference system. According to the relatively static characteristics of the seawater level in the drilling casing, a floating fixed reference device is adopted, which has good stability and can overcome the influence of sea conditions, thereby improving the accuracy of the in-situ test hammer count.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A marine drilling in-situ test footage measurement reference system comprises a construction vessel, a drilling platform is arranged on the construction vessel, a movable casing is arranged on the drilling platform, a floating fixed reference device is arranged inside the movable casing, and the floating fixed reference device is provided with a guide pipe and a buoyancy device.
[0007] A further improvement of the utility model is that the guide pipe includes a guide pipe A, one end of the guide pipe A is connected to a guide joint A, and the other end is connected to a positioning joint; one end of the guide pipe B is connected to the positioning joint, and the other end is connected to the guide joint B.
[0008] A further improvement of the utility model is that the buoyancy device includes a foam-filled rubber column and a solid rubber column, one end of the foam-filled rubber column and the solid rubber column is connected to a positioning joint, and the other end is connected to a guide joint B, and is fixedly installed on the outer surface of the guide tube B with a step surface.
[0009] A further improvement of the present invention is that the openings at one end of the guide joint A and the guide joint B are in the shape of an outwardly expanding cone.
[0010] A further improvement of the utility model is that the floating fixed reference device is 1.0 to 1.2 meters higher than the movable casing opening.
[0011] A further improvement of the utility model is that the foam-filled rubber column adopts EPDM ethylene propylene diene monomer rubber material and polystyrene foam-filled material, and the solid rubber column adopts EPDM ethylene propylene diene monomer rubber material.
[0012] A further improvement of the utility model is that the number of the foam-filled rubber columns is 5 to 8, and the number of the solid rubber columns is 3 to 4.
[0013] Compared with the prior art, the beneficial effects achieved by the utility model are:
[0014] 1. The utility model is a marine drilling in-situ test footage measurement reference system, which adopts a floating fixed reference object, can overcome the influence of sea conditions, solve the problem of determining the fixed reference object in the in-situ test under the condition of unstable sea surface, and improve the accuracy of the in-situ test hammer count.
[0015] 2. The utility model is a marine drilling in-situ test footage measurement reference system, in which the foam-filled rubber column and the solid rubber column are positioned by a step surface where a positioning joint and one end of a guide joint contact each other, so as to facilitate installation and disassembly.
[0016] 3. The utility model is a marine drilling in-situ test footage measurement reference system, wherein the openings at one end of the guide joint A and the guide joint B are in an outwardly expanding cone shape, which not only plays a guiding role to facilitate the passage of the drill rod, but also prevents the drill rod from being scratched and causing position errors.
[0017] 4. The utility model is a marine drilling in-situ test footage measurement reference system, the floating fixed reference device exceeds the movable casing mouth by 1.0 to 1.2 meters and is connected by threads, which is compatible with common drilling tools and easy to disassemble.
[0018] 5. The utility model is a marine drilling in-situ test footage measurement reference system. The foam-filled rubber column adopts EPDM ethylene propylene diene monomer rubber material and polystyrene foam filling material, and the solid rubber column adopts EPDM ethylene propylene diene monomer rubber material. It has good toughness, high strength, light weight, anti-corrosion and anti-rust functions, and can be reused, which not only reduces the overall weight but also extends the service life.
[0019] 6. The utility model is a marine drilling in-situ test footage measurement reference system. By adjusting the quantity ratio of the foam-filled rubber column and the solid rubber column type, it can adapt to liquids of different densities and adjust the buoyancy of the device to keep the floating fixed reference object above the movable casing port at a certain height, which is convenient for in-situ testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall drilling work of the utility model.
[0021] Figure 2 This is the assembly drawing for the in-situ test work of the utility model.
[0022] Figure 3 The utility model is a structural schematic diagram of a floating in-situ test footage measurement reference system device.
[0023] Figure 4 It is a structural schematic diagram of the positioning joint of the utility model.
[0024] Figure 5 It is a structural schematic diagram of the guide joint of the utility model.
[0025] Figure 6 It is a structural schematic diagram of the foam-filled rubber column of the utility model.
[0026] In the figure: 1-construction ship, 101-drilling platform, 102-movable casing, 2-floating fixed reference device, 201-guide tube A, 202-guide joint A, 203-positioning joint, 204-foam-filled rubber column, 205-guide tube B, 206-solid rubber column, 207-guide joint B, 3-hammer guide rod, 4-hammer, 5-drill pipe, 6-standard penetration tester or conical dynamic probe. DETAILED DESCRIPTION
[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.
[0028] like Figures 1 to 5 As shown, a marine drilling in-situ test footage measurement reference system includes a construction ship 1, a drilling platform 101 is provided on the construction ship 1, a movable casing 102 is provided on the drilling platform 101, and a floating fixed reference device 2 is arranged inside the movable casing 102. The floating fixed reference device 2 is provided with a guide pipe and a buoyancy device.
[0029] The guide pipe includes a guide pipe A201, one end of which is connected to a guide joint A202, and the other end is connected to a positioning joint 203; one end of the guide pipe B205 is connected to the positioning joint 203, and the other end is connected to a guide joint B207.
[0030] The buoyancy device includes a foam-filled rubber column 204 and a solid rubber column 206, one end of the foam-filled rubber column 204 and the solid rubber column 206 is connected to the positioning joint 203, and the other end is connected to the guide joint B207, and is fixedly installed on the outer surface of the guide tube B205 with a step surface.
[0031] Among them, the opening shape of one end of the guide joint A201 and the guide joint B207 is an outward-expanding cone.
[0032] Among them, the floating fixed reference device 2 is 1.0~1.2 meters higher than the movable casing 102.
[0033] The foam-filled rubber column 204 is made of EPDM ethylene propylene diene monomer rubber material and polystyrene foam-filled material, and the solid rubber column 206 is made of EPDM ethylene propylene diene monomer rubber material.
[0034] There are six foam-filled rubber columns 204 and three solid rubber columns 206 .
[0035] The specific working principle of the utility model is as follows:
[0036] Before the in-situ test, remove the residue at the bottom of the hole. When drilling, use the drilling equipment to vertically lower the penetration tester or conical dynamic probe 6, φ42mm drill pipe 5, floating in-situ test footage measurement reference system device 2, hammer guide rod 3 and hammer 4 into the casing in sequence. According to the relevant specifications and the footage measurement reference system device, calibrate the in-situ test parameters and then conduct the test. During the test, record the corresponding penetration hammer number. After the test, lift the drill after the test. Lift the test equipment in the reverse direction according to the aforementioned drilling sequence to complete the test.
[0037] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A marine drilling in-situ test footage measurement reference system, comprising a construction vessel (1), the construction vessel (1) being provided with a drilling platform (101), the drilling platform (101) being provided with a movable casing (102), Features: The floating fixed reference device (2) comprises a floating fixed reference device (2) arranged inside a movable sleeve (102), the floating fixed reference device (2) moves freely under the action of buoyancy, and the floating fixed reference device (2) comprises a guide pipe and a buoyancy device.
2. The marine drilling in-situ test footage measurement reference system according to claim 1, Features: The guide pipe comprises a guide pipe A (202), one end of the guide pipe A (202) is connected to a guide joint A (201), and the other end is connected to a positioning joint (203); one end of the guide pipe B (205) is connected to the positioning joint (203), and the other end is connected to a guide joint B (207).
3. The marine drilling in-situ test footage measurement reference system according to claim 1 or 2, Features: The buoyancy device comprises a foam-filled rubber column (204) and a solid rubber column (206), one end of the foam-filled rubber column (204) and the solid rubber column (206) are connected to a positioning joint (203) and the other end is connected to a guide joint B (207), and is fixedly mounted on the outer surface of a guide tube B (205) with a stepped surface.
4. The marine drilling in-situ test footage measurement reference system according to claim 3, Features: The openings at one end of the guide joint A (201) and the guide joint B (207) are in the shape of an outward-expanding cone.
5. The marine drilling in-situ test footage measurement reference system according to claim 3, Features: The floating fixed reference device (2) is 1.0 to 1.2 meters higher than the opening of the movable casing (102).
6. The marine drilling in-situ test footage measurement reference system according to claim 4 or 5, Features: The foam-filled rubber column (204) is made of EPDM ethylene propylene diene monomer rubber material and polystyrene foam-filled material, and the solid rubber column (206) is made of EPDM ethylene propylene diene monomer rubber material.
7. The marine drilling in-situ test footage measurement reference system according to claim 6, Features: The number of the foam-filled rubber columns (204) is 5 to 8, and the number of the solid rubber columns (206) is 3 to 4.