Composite coring centralizer

Abstract

The present application relates to the technical field of core coring tool, and is a composite coring centralizer device, which comprises a body, outer cylinder centralizing bodies, outer cylinder centralizing blocks, inner cylinder centralizing bodies, inner cylinder centralizing blocks and a fixing device, the body is a through cylinder, a plurality of outer cylinder centralizing bodies are uniformly distributed on the outer side of the upper part of the body along the circumference, the middle part of the outer cylinder centralizing body is provided with an installation groove with an opening outward, the outer cylinder centralizing block is fixedly installed in the installation groove, and the inner side of the body corresponding to the upper end position of the outer cylinder centralizing block is provided with an installation ring table. The present application has the advantages of reasonable and compact structure, convenient use, outer cylinder centralizing bodies and outer cylinder centralizing blocks arranged on the outer side of the body for centralizing the outer cylinder, inner cylinder centralizing bodies and inner cylinder centralizing blocks arranged on the inner side of the body for centralizing the inner cylinder, so that the inner cylinder and the outer cylinder can be centralized by one tool, the number of components is reduced, the cost is saved, the installation and dismounting efficiency is improved, and the device has the characteristics of safety, labor saving, simplicity, convenience and high efficiency.

Description

Technical Field

[0001] This invention relates to the field of core sampling tools, specifically a composite core sampling and straightening device. Background Technology

[0002] As oilfields enter the deep oil and gas resource exploration and development stage, the poor drillability of deep formations, low drilling speeds for coring rigs, and long single-trip coring times place higher demands on coring technology contractors. Coring tools must possess high stability and reliability. Improving coring speed through drill bit optimization remains challenging. On-site coring speed improvements typically involve medium-length barrel coring or downhole power-driven coring methods. However, in deep formations, long drilling times and the risk of core breakage within the inner barrel make it difficult for lower cores to enter, leading to stuck, ground, and blocked cores. This negatively impacts coring yield and other technical indicators, limiting the adoption of medium-length barrel and downhole power coring technologies. Therefore, ensuring the stability of coring tools is crucial to meeting the needs of medium-length barrel and downhole power coring. Existing coring methods...

[0003] Most straightening sections are single components, such as inner cylinder straightening sections and outer cylinder straightening sections, resulting in many parts and complicated installation and maintenance. Summary of the Invention

[0004] This invention provides a composite coring and straightening device that overcomes the shortcomings of the prior art. It can effectively solve the problems of time-consuming and labor-intensive installation and maintenance, and low construction efficiency of existing coring and straightening short sections.

[0005] The technical solution of the present invention is achieved through the following measures: A composite coring and straightening device includes a body, an outer cylinder straightening body, an outer cylinder straightening protrusion, an inner cylinder straightening body, an inner cylinder straightening protrusion, and a fixing device. The body is a cylindrical body that runs vertically through the body. Multiple outer cylinder straightening bodies are evenly distributed around the circumference of the upper outer side of the body. An outward-opening mounting groove is provided in the middle of the outer cylinder straightening body. An outer cylinder straightening protrusion is fixedly installed in the mounting groove. An mounting ring platform is provided on the inner side of the body corresponding to the upper end of the outer cylinder straightening protrusion. An inner cylinder straightening body is mounted on the mounting ring platform. Multiple inward-opening fixing grooves are evenly distributed around the circumference of the inner side of the inner cylinder straightening body. An inner cylinder straightening protrusion is provided in the middle of each fixing groove. An vertically through mounting hole is provided in the middle of each inner cylinder straightening protrusion. A first fixing hole and a second fixing hole are respectively provided on the upper and lower parts of the inner straightening body corresponding to the mounting hole position. The fixing device passes through the first fixing hole, the mounting hole, and the second fixing hole from top to bottom.

[0006] The following are further optimizations and / or improvements to the above-mentioned technical solution:

[0007] The above may also include a protective sleeve, which is threadedly connected to the outer side of the main body at the upper position of the outer cylinder centralizer, and the outer cylinder centralizer is threadedly connected to the main body.

[0008] The aforementioned fixing device can be a pin.

[0009] At least eight outer cylinder straighteners may be evenly distributed along the circumference on the upper outer side of the aforementioned body.

[0010] The inner cylinder straightener body has at least six inwardly opening fixing grooves evenly distributed along the circumference in the middle of its inner side.

[0011] The above may also include an upper connector, an outer cylinder centralizer, a centralizing connecting section, an inner cylinder centralizing section, a spring sleeve, a ball seat, a spring limiting ring, a spring, a piston rod, a bearing, a flow divider, a bearing sleeve, a connecting connector, a retaining ring, a snap ring, a locking screw, an outer cylinder, an inner cylinder, a core drill bit, and a core gripping device. The upper connector, outer cylinder centralizer, outer cylinder, body, and core drill bit are connected together sequentially from top to bottom by threads. Inside the outer cylinder, there is an inner cylinder, a centralizing connecting section, an inner cylinder centralizing section, and a core gripping device connected together sequentially from top to bottom by threads. A spring sleeve is threaded to the inner side of the upper end of the inner cylinder. A ball seat is provided on the inner side of the lower end of the spring sleeve, a spring limiting ring is provided on the inner side of the upper part of the spring sleeve, a spring is provided in the middle of the spring limiting ring, a piston rod is provided on the inner side of the spring sleeve, and the upper end of the spring sleeve is connected to the diverter. At least four diverter holes are evenly distributed around the circumference in the middle of the diverter. An installation ring groove is provided on the outer side of the front end of the diverter. A bearing is provided in the installation ring groove. A bearing sleeve with its lower end located on the outer side of the middle of the diverter is provided on the outer side of the bearing. A connecting joint is provided above the bearing. The connecting joint is fitted with a retaining ring, a retaining ring, and a locking screw ring from bottom to top. The lower end of the upper joint is located between the stabilizer and the connecting joint.

[0012] This invention has a reasonable and compact structure and is easy to use. It uses an outer cylinder straightener and an outer cylinder straightening protrusion on the outside of the main body to straighten the outer cylinder, and an inner cylinder straightener and an inner cylinder straightening protrusion on the inside of the main body to straighten the inner cylinder. This allows a single tool to straighten both the inner and outer cylinders, reducing the number of parts, saving costs, and improving installation and disassembly efficiency. It is safe, labor-saving, simple, and efficient. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic cross-sectional view of the main body of the present invention.

[0014] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of the cross-sectional structure at point AA.

[0015] Appendix Figure 3 This is a schematic diagram of the upper half of the coring tool.

[0016] Appendix Figure 4This is a schematic diagram of the lower half of the coring tool.

[0017] The codes in the attached diagram are as follows: 1 is the main body, 2 is the outer cylinder straightener, 3 is the outer cylinder straightener protrusion, 4 is the inner cylinder straightener, 5 is the inner cylinder straightener protrusion, 6 is the pin, 7 is the protective sleeve, 8 is the upper connector, 9 is the outer cylinder straightener, 10 is the straightener connecting section, 11 is the inner cylinder straightener section, 12 is the spring sleeve, 13 is the ball seat, 14 is the spring limiting ring, 15 is the spring, 16 is the piston rod, 17 is the bearing, 18 is the flow divider, 19 is the bearing sleeve, 20 is the connecting joint, 21 is the retaining ring, 22 is the retaining ring, 23 is the locking screw ring, 24 is the outer cylinder, 25 is the inner cylinder, 26 is the core drill bit, 27 is the core gripping device, and 28 is the flow divider hole. Detailed Implementation

[0018] The present invention is not limited to the following embodiments, and specific implementation methods can be determined according to the technical solutions and actual conditions of the present invention.

[0019] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as front, back, top, bottom, left, right, etc. The positional relationships are determined based on the layout direction of the attached diagram in the instruction manual.

[0020] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0021] As attached Figure 1 , 2 As shown in Figures 3 and 4, the composite coring and straightening device includes a main body 1, an outer cylinder straightening body 2, an outer cylinder straightening protrusion 3, an inner cylinder straightening body 4, an inner cylinder straightening protrusion 5, and a fixing device. The main body 1 is a cylindrical body that runs vertically through the body. At least eight outer cylinder straightening bodies 2 are evenly distributed around the circumference of the upper outer side of the main body 1. The outer cylinder straightening body 2 has an outward-facing mounting groove in the middle, and an outer cylinder straightening protrusion 3 is fixedly installed in the mounting groove. A mounting device is provided on the inner side of the main body 1 corresponding to the upper position of the outer cylinder straightening protrusion 3. The ring platform is equipped with an inner cylinder straightener 4. The inner cylinder straightener 4 has at least six inwardly opening fixing grooves evenly distributed along the circumference of its inner side center. Each fixing groove has an inner cylinder straightener protrusion 5 in the center. Each inner cylinder straightener protrusion 5 has a vertically penetrating mounting hole in the center. The upper and lower parts of the inner straightener corresponding to the mounting hole positions have a vertically penetrating first fixing hole and a second fixing hole, respectively. The fixing device passes through the first fixing hole, the mounting hole and the second fixing hole from top to bottom.

[0022] During use, if the well inclination is large during core drilling, the outer cylinder 24 is prone to bending. The outer cylinder straightening protrusion 3 straightens and positions the outer cylinder 24. When the inner cylinder 25 in the core drilling is bent under the centrifugal force of the drill string rotation, the inner cylinder straightening protrusion 5 holds the inner cylinder 25 and straightens its position to prevent bending. Since the inner cylinder straightening protrusion 5 is connected by the pin 6, it does not hinder the rotation of the inner cylinder. When the inner cylinder rotates, it drives the inner cylinder straightening protrusion 5 to rotate together, thus realizing a short section that integrates outer cylinder straightening and inner cylinder straightening. This reduces the use of short sections, lowers costs, and reduces maintenance. At the same time, it reduces the problem of core being easily broken, corroded, or worn rounded, causing losses or even blockages, which seriously affect the core recovery rate. This invention is easy to install and replace on site. It can be used in vertical and directional wells, as well as in conventional and closed coring in the horizontal section of horizontal wells. It can be used with downhole power-driven coring, which solves the problems of uprighting the inner and outer cylinders of the coring tool and meets the needs of medium and long cylinders and downhole power coring on site.

[0023] The above-mentioned composite coring and straightening device can be further optimized and / or improved according to actual needs:

[0024] As attached Figure 1 , 2 As shown in Figures 3 and 4, a protective sleeve 7 is also included. The protective sleeve 7 is threadedly connected to the outer side of the main body 1 at the upper position of the outer cylinder centralizer 2. The outer cylinder centralizer 2 and the main body 1 are connected by threads. In use, the protective sleeve 7 limits the upper end of the main body 1. At the same time, due to wear, the outer cylinder centralizer 2 and the main body 1 are detachably connected together for easy replacement and maintenance.

[0025] As attached Figure 1 , 2 As shown in Figures 3 and 4, the fixing device is a pin. In use, the inner cylinder straightening protrusion 5 is fixed by the pin 6, allowing it to rotate.

[0026] As attached Figure 1 , 2 As shown in Figures 3 and 4, at least eight outer cylinder straighteners 2 are evenly distributed along the circumference of the upper outer side of the main body 1. During use, by setting at least eight outer cylinder straighteners 2, the position of the outer cylinder can be kept as stable as possible and displacement can be reduced.

[0027] As attached Figure 1 , 2 As shown in Figures 3 and 4, at least six inwardly opening fixing grooves are evenly distributed along the circumference of the inner side of the inner cylinder straightener 4. In use, by setting at least six fixing grooves, at least six inner cylinder straightener protrusions 5 are placed to maintain the position of the inner cylinder and reduce bending.

[0028] As attached Figure 3 , 4As shown, it also includes an upper connector 8, an outer cylinder centralizer 9, a centralizer connecting section 10, an inner cylinder centralizer connecting section 11, a spring sleeve 12, a ball seat 13, a spring limiting ring 14, a spring 15, a piston rod 16, a bearing 17, a flow divider 18, a bearing sleeve 19, a connecting connector 20, a retaining ring 21, a retaining ring 22, a locking screw ring 23, an outer cylinder 24, an inner cylinder 25, a core drill bit 26, and a core gripping device 27. The upper connector 8, the outer cylinder centralizer 9, the outer cylinder 24, the body 1, and the core drill bit 26 are connected together from top to bottom by threads. Inside the outer cylinder 24, the inner cylinder 25, the centralizer connecting section 10, the inner cylinder centralizer connecting section 11, and the core gripping device 27 are connected together from top to bottom by threads. The inner side of the upper end of the inner cylinder 25 is threaded with... A spring sleeve 12 has a ball seat 13 on the inner side of its lower end and a spring limiting ring 14 on the inner side of its upper part. A spring is located in the middle of the spring limiting ring 14. A piston rod 16 is located on the inner side of the spring sleeve 12. The upper end of the spring sleeve 12 is connected to a diverter 18. At least four diverter holes 28 are evenly distributed around the circumference of the diverter 18. An installation ring groove is located on the outer side of the front end of the diverter 18. A bearing 17 is located in the installation ring groove. A bearing sleeve 19 is located on the outer side of the bearing 17, with its lower end located on the outer side of the middle part of the diverter 18. A connecting joint 20 is located above the bearing 17. The connecting joint 20 is fitted with a retaining ring 21, a retaining ring 22, and a locking screw ring 23 from bottom to top. The lower end of the upper joint 8 is located between the stabilizer and the connecting joint 20.

[0029] According to the requirements, both the outer cylinder centralizer 9 and the inner cylinder centralizer stub 11 adopt existing known technologies.

[0030] During closed-loop coring, drilling fluid circulates through the annulus between the inner cylinder 25 and the outer cylinder 24 of the coring tool. Once ready, the drill string is lowered, the suspension pin is cut, and coring begins. As the core gradually enters the inner cylinder 25, the sealing body and sealing rod move upwards with the core. The sealing fluid in the upper part of the inner cylinder 25 flows out from the annular space between the inner cylinder 25 and the sealing body and adheres to the outer surface of the core column, isolating the core from contact with the mud. The mud filtrate does not enter the core, ensuring the original formation data.

[0031] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A composite coring and straightening device, characterized in that... The system includes a main body, an outer cylinder straightener, an outer cylinder straightening protrusion, an inner cylinder straightener, an inner cylinder straightening protrusion, and a fixing device. The main body is a cylindrical body that runs vertically through the body. Multiple outer cylinder straighteners are evenly distributed around the circumference of the upper outer side of the main body. Each outer cylinder straightener has an outward-facing mounting groove in its center, within which an outer cylinder straightening protrusion is fixedly installed. A mounting ring platform is located on the inner side of the main body corresponding to the upper position of the outer cylinder straightening protrusion. An inner cylinder straightener sits on the mounting ring platform. Multiple inward-facing openings are evenly distributed around the circumference of the inner side of the inner cylinder straightener. The system includes a fixing groove, with an inner cylinder straightening protrusion in the center of each groove. Each inner cylinder straightening protrusion has a vertically penetrating mounting hole in the center. Corresponding to the mounting hole positions, the upper and lower parts of the inner straightening body have vertically penetrating first and second fixing holes, respectively. The fixing device passes through the first fixing hole, mounting hole, and second fixing hole sequentially from top to bottom. The system also includes an upper connector, an outer cylinder straightener, a straightening connecting section, an inner cylinder straightening section, a spring sleeve, a ball seat, a spring limiting ring, a spring, a piston rod, a bearing, and a flow divider. The components include a connector, bearing sleeve, connecting connector, retaining ring, snap ring, locking screw ring, outer cylinder, inner cylinder, core drill bit, and core gripping device. The upper connector, outer cylinder centralizer, outer cylinder, body, and core drill bit are sequentially connected from top to bottom by threads. Inside the outer cylinder are an inner cylinder, centralizer connecting section, inner cylinder centralizer section, and core gripping device, sequentially connected from top to bottom by threads. A spring sleeve is threaded to the inner side of the upper end of the inner cylinder. A ball seat is located on the inner side of the lower end of the spring sleeve, and a spring limiting ring is located on the inner side of the upper part of the spring sleeve. A spring is provided in the middle of the spring limiting ring, and a piston rod is provided inside the spring sleeve. The upper end of the spring sleeve is connected to the diverter. At least four diverter holes are evenly distributed around the circumference in the middle of the diverter. An installation ring groove is provided on the outer side of the front end of the diverter. A bearing is provided in the installation ring groove. A bearing sleeve with its lower end located on the outer side of the middle of the diverter is provided on the outer side of the bearing. A connecting joint is provided above the bearing. The connecting joint is fitted with a retaining ring, a retaining ring, and a locking screw ring from bottom to top. The lower end of the upper joint is located between the stabilizer and the connecting joint.

2. The composite coring and straightening device according to claim 1, characterized in that... It also includes a protective sleeve, which is threadedly connected to the outer side of the main body at the upper position of the outer cylinder centering body. The outer cylinder centering body and the main body are connected by threads.

3. The composite coring and straightening device according to claim 1 or 2, characterized in that... The fixing device is a pin.

4. The composite coring and straightening device according to claim 1 or 2, characterized in that... At least eight outer cylinder uprighting bodies are evenly distributed along the circumference of the upper outer side of the main body.

5. The composite coring and straightening device according to claim 3, characterized in that... At least eight outer cylinder uprighting bodies are evenly distributed along the circumference of the upper outer side of the main body.

6. The composite coring and straightening device according to claim 1, 2, or 5, characterized in that... The inner cylinder straightener has at least six inwardly opening fixing grooves evenly distributed along the circumference of the inner side center.

7. The composite coring and straightening device according to claim 3, characterized in that... The inner cylinder straightener has at least six inwardly opening fixing grooves evenly distributed along the circumference of the inner side center.

8. The composite coring and straightening device according to claim 4, characterized in that... The inner cylinder straightener has at least six inwardly opening fixing grooves evenly distributed along the circumference of the inner side center.

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