Vertical directional drilling wire-line coring outer pipe processing technology

Abstract

The invention belongs to the technical field of drilling tools, and discloses a vertical directional drilling wire-line coring outer pipe machining process which comprises the steps that firstly, thermal refining is conducted, specifically, a raw material pipe is subjected to quenching and tempering in sequence, and an outer pipe fitting is obtained; step 2, shaping; thirdly, machining is conducted, butt joints are formed at the two ends of the outer pipe fitting, and the butt joints are used for being connected with a drill bit or another outer pipe fitting; and 4, high-frequency quenching is conducted, specifically, the inner wall of the outer pipe fitting is subjected to high-frequency quenching treatment. According to the machining technology for the vertical directional drilling wire-line coring outer pipe, the outer pipe fitting with good comprehensive mechanical performance, straightness and structural characteristics is firstly formed, then the inner wall of the outer pipe fitting is subjected to high-frequency quenching, a hardening layer is formed on the surface of the inner wall, the abrasion resistance of the inner wall is improved, and therefore the machining efficiency of the vertical directional drilling wire-line coring working condition is improved. And the overall service life of the outer pipe fitting is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a processing technology for a vertical directional drilling rope coring outer tube. Background Art

[0002] Rope coring drill is a kind of drilling and coring tool widely used in core drilling. After drilling, all drill rods are not pulled out. The core tube in the drill can be fished out with a winch wire rope with a salvage device to obtain the core, thus greatly improving the speed of coring.

[0003] like Figure 1 As shown, the outer coring tube 1 of the rope coring drill plays a major role in drilling, and the inner coring tube 2 of the rope coring drill is inserted into the outer coring tube 1 to achieve the function of obtaining the core. The outer coring tube 1 is mostly a quenched and tempered steel tube. For vertical directional drilling conditions, its hardness generally reaches HRC 30-35 to meet the vertical drilling requirements. However, since the inner coring tube 2 continuously rotates in the outer coring tube 1 and is accompanied by the stirring of the core, mud, etc., the inner wall of the outer coring tube 1 at this hardness is easily worn, which may directly lead to the scrapping of the outer coring tube 1 in severe cases. Therefore, it is necessary to optimize the manufacturing process of the outer coring tube 1. Summary of the invention

[0004] Based on the above problems, the object of the present invention is to provide a vertical directional drilling rope coring outer tube processing technology to improve the wear resistance of the inner wall of the coring outer tube.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A vertical directional drilling rope coring outer tube processing technology, comprising:

[0007] Step 1: quenching and tempering treatment, quenching and tempering the raw material pipe in sequence to obtain the outer pipe fitting;

[0008] Step 2: Plastic surgery;

[0009] Step 3: machining to form butt joints at both ends of the outer tube fitting, and the butt joints are used to connect a drill bit or another outer tube fitting;

[0010] Step 4: High frequency quenching: the inner wall of the outer pipe fitting is subjected to high frequency quenching treatment.

[0011] As an optional solution, in step 4, high-frequency quenching adopts electric induction heating. The induction coil is inserted into the outer tube fitting and close to the inner wall. The induction current frequency is 200kHz. The heating temperature is 850℃~900℃ for 10s, then the induction coil is taken out and cold water is sprayed on the inner wall of the outer tube fitting for 15s~20s.

[0012] As an optional solution, in step 4, the depth of the hardened layer on the inner wall of the outer tube fitting is 1.5 mm to 2 mm.

[0013] As an optional solution, in step 4, after high-frequency quenching, the outer pipe fitting is immediately placed in a heat-insulating furnace with an inert atmosphere for low-temperature tempering for 2 hours.

[0014] As an optional solution, in step one, the quenching temperature is controlled at 890°C to 910°C, and after quenching, it is sprayed with water to cool to room temperature; the tempering temperature is controlled at 580°C to 600°C, and after tempering, it is naturally air-cooled to room temperature.

[0015] As an optional scheme, the raw material pipe is obtained by pre-annealing and surface treatment in sequence from the rough pipe. The annealing temperature of the pre-annealing treatment is controlled at 780°C to 800°C, and the temperature is kept for 30min to 40min. After cooling to 550°C in the furnace, it is taken out of the furnace and air-cooled to room temperature. The surface treatment uses sulfuric acid pickling with a mass concentration of 7% to 24%, the pickling time is 20min to 60min, the treatment temperature is 40°C to 60°C, and after pickling, it is immersed in clean water and high-pressure rinsed.

[0016] As an option, after step 1, the outer pipe fittings are immediately subjected to hardness testing and flaw detection.

[0017] As an optional solution, in step 2, the shaping includes micro-deformation cold drawing and straightening, the cold drawing coefficient of the micro-deformation cold drawing is 1.05-1.1, and the straightness of the outer tube fitting after straightening is ≤0.50mm / m.

[0018] The beneficial effects of the present invention are as follows: the vertical directional drilling rope coring outer tube processing technology first forms an outer tube fitting with good comprehensive mechanical properties, straightness and structural characteristics, and then performs high-frequency quenching on the inner wall of the outer tube fitting to form a hardened layer on the inner wall surface, thereby improving the wear resistance of the inner wall, thereby improving the overall service life of the outer tube fitting for the vertical directional drilling rope coring working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a rope coring drill according to an embodiment of the present invention;

[0020] Figure 2 The present invention is a flowchart of a vertical directional drilling rope coring outer tube processing process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0022] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0025] against Figure 1 Based on the working conditions of the coring outer tube 1 of the wireline coring drill and the wear condition of the inner wall of the coring outer tube 1, this preferred embodiment provides a processing technology for the vertical directional drilling wireline coring outer tube, such as Figure 2 As shown, the following steps are included:

[0026] S100: quenching and tempering treatment, quenching and tempering the raw pipe in sequence to obtain outer pipe fittings;

[0027] S200: plastic surgery;

[0028] S300: machining, forming butt joints at both ends of the outer tube fitting, the butt joints being used to connect the drill bit 3 or another outer tube fitting;

[0029] S400: High frequency quenching, the inner wall of the outer pipe fittings is subjected to high frequency quenching treatment.

[0030] Therefore, the vertical directional drilling rope coring outer tube processing technology first forms an outer tube fitting with good comprehensive mechanical properties, straightness and structural characteristics, and then performs high-frequency quenching on the inner wall of the outer tube fitting to form a hardened layer 4 on the inner wall surface, thereby improving the wear resistance of the inner wall, thereby improving the overall service life of the outer tube fitting for the vertical directional drilling rope coring working condition.

[0031] The raw material pipe is obtained by pre-annealing and surface treatment in sequence from a rough pipe. The annealing temperature of the pre-annealing treatment is controlled at 780°C to 800°C, and the pipe is kept warm for 30min to 40min. After cooling to 550°C in the furnace, the pipe is taken out of the furnace and air-cooled to room temperature. The surface treatment uses sulfuric acid pickling with a mass concentration of 7% to 24%, the pickling time is 20min to 60min, the treatment temperature is 40°C to 60°C, and the pipe is immersed in clean water and rinsed under high pressure after pickling.

[0032] Specifically, in step S100, the quenching temperature is controlled at 890°C to 910°C, and after quenching, it is sprayed with water to cool to room temperature; the tempering temperature is controlled at 580°C to 600°C, and after tempering, it is naturally air-cooled to room temperature; after tempering, the outer pipe fittings are immediately subjected to hardness testing and flaw detection to ensure the forming quality after heat treatment, so that the outer pipe fittings have good comprehensive mechanical properties.

[0033] Specifically, in step S200, the shaping includes micro-deformation cold drawing and straightening, the cold drawing coefficient of the micro-deformation cold drawing is 1.05-1.1, and the straightness of the outer tube fitting after straightening is ≤0.50 mm / m, so that the outer tube fitting meets the straightness requirement.

[0034] Specifically, in step S300, the butt joint of the outer tube fitting adopts a male-female matching mode, so that the rope coring drill tool can be lengthened as the drilling goes deeper, and the drill bit 3 is installed at the end of the outer tube fitting at the lowest end.

[0035] Specifically, in step S400, the high-frequency quenching adopts an electric induction heating method, and the induction coil is inserted into the outer tube fitting and close to the inner wall. The induction current frequency is 200kHz, and the heating temperature is 850℃~900℃ for 10s. After that, the induction coil is taken out, and cold water is sprayed on the inner wall of the outer tube fitting for 15s~20s, thereby controlling the depth of the hardened layer 4 formed on the inner wall of the outer tube fitting to be 1.5mm~2mm. Further, after the high-frequency quenching in step S400, the outer tube fitting is immediately placed in a heat preservation furnace with an inert atmosphere for low-temperature tempering for 2h.

[0036] It should be noted that this method of strengthening the inner wall surface of the outer tube fitting by high-frequency quenching is only applicable to vertical directional drilling conditions. If the outer tube fitting is bent and deformed during horizontal drilling, the high-frequency quenched hardened layer 4 will crack, and the wear resistance cannot be effectively guaranteed.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A process for processing an outer tube for vertical directional drilling with a rope, characterized in that: include: Step 1: quenching and tempering treatment, quenching and tempering the raw material pipe in sequence to obtain the outer pipe fitting; Step 2: Plastic surgery; Step 3: machining to form butt joints at both ends of the outer tube fitting, wherein the butt joints are used to connect a drill bit (3) or another outer tube fitting; Step 4: High frequency quenching: the inner wall of the outer pipe fitting is subjected to high frequency quenching treatment.

2. The process for processing the outer tube for vertical directional drilling with a rope coring according to claim 1 is characterized in that: In step 4, high-frequency quenching adopts electric induction heating, and the induction coil is inserted into the outer tube fitting and close to the inner wall. The induction current frequency is 200kHz. The heating temperature is 850℃~900℃ for 10s, then the induction coil is taken out and cold water is sprayed on the inner wall of the outer tube fitting for 15s~20s.

3. The process for processing the outer tube for vertical directional drilling with a rope coring according to claim 2 is characterized in that: In step 4, the depth of the inner wall hardened layer (4) of the outer tube fitting is 1.5 mm to 2 mm.

4. The process for processing the outer tube for vertical directional drilling with a rope coring according to claim 1, characterized in that: In step 4, after high-frequency quenching, the outer tube fitting is immediately placed in a heat-insulating furnace with an inert atmosphere for low-temperature tempering for 2 hours.

5. The process for processing the outer tube for vertical directional drilling wireline coring according to claim 1, characterized in that: In step 1, the quenching temperature is controlled at 890°C to 910°C, and after quenching, it is sprayed with water to cool to room temperature; the tempering temperature is controlled at 580°C to 600°C, and after tempering, it is naturally air-cooled to room temperature.

6. The process for processing the outer tube for vertical directional drilling wireline coring according to claim 1, characterized in that: The raw material pipe is obtained by sequentially undergoing pre-annealing treatment and surface treatment from a rough pipe. The annealing temperature of the pre-annealing treatment is controlled at 780°C to 800°C, and the temperature is kept for 30min to 40min. After cooling to 550°C in the furnace, the pipe is taken out of the furnace and air-cooled to room temperature. The surface treatment uses sulfuric acid pickling with a mass concentration of 7% to 24%, the pickling time is 20min to 60min, the treatment temperature is 40°C to 60°C, and after pickling, it is immersed in clean water and rinsed under high pressure.

7. The process for processing the outer tube for vertical directional drilling with a rope coring according to claim 1, characterized in that: After step 1, the outer pipe fitting is immediately subjected to hardness testing and flaw detection.

8. The process for processing the outer tube for vertical directional drilling wireline coring according to claim 1, characterized in that: In step 2, the shaping includes micro-deformation cold drawing and straightening, the cold drawing coefficient of the micro-deformation cold drawing is 1.05-1.1, and the straightness of the outer tube fitting after straightening is ≤0.50mm / m.

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