CN113560828A - Preparation method of titanium alloy drill rod joint - Google Patents
Preparation method of titanium alloy drill rod joint Download PDFInfo
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- CN113560828A CN113560828A CN202110952533.XA CN202110952533A CN113560828A CN 113560828 A CN113560828 A CN 113560828A CN 202110952533 A CN202110952533 A CN 202110952533A CN 113560828 A CN113560828 A CN 113560828A
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- titanium alloy
- radial forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the technical field of petroleum drill pipes and discloses a preparation method of a titanium alloy drill pipe joint, which comprises the following steps: 1) performing primary radial forging on the titanium alloy bar blank; 2) drilling a center of the titanium alloy bar blank to manufacture a titanium alloy tube blank; 3) performing secondary radial forging on the titanium alloy pipe blank; 4) carrying out perforation variable-section radial forging on the titanium alloy tube blank; 5) carrying out heat treatment on the variable cross-section titanium alloy pipe; 6) sawing the variable cross-section titanium alloy pipe and roughly processing a joint; 7) and (3) performing finish machining and thread machining on the inner surface and the outer surface of the titanium alloy drill rod joint. According to the preparation method of the titanium alloy drill rod joint, the titanium alloy drill rod joint is prepared by performing diameter forging, perforation variable cross section diameter forging and heat treatment on the variable cross section titanium alloy thick-wall pipe, the microstructure of the product is uniform, the mechanical property is excellent, and the material cost is saved.
Description
Technical Field
The invention relates to the technical field of petroleum drill pipes, in particular to a preparation method of a titanium alloy drill pipe joint.
Background
Compared with the traditional steel drill rod, the titanium alloy drill rod has the characteristics of high specific strength, low elastic modulus, corrosion resistance, fatigue resistance and the like, can effectively solve the technical problem of short-radius horizontal well drilling tool fatigue, can obviously reduce the load and the on-site energy consumption of a deep well and an ultra-deep well drilling tool, is suitable for the development of high-sulfur-containing acidic oil and gas fields, greatly improves the drilling efficiency and safety, and is a technical tool for drilling operation of deep wells, ultra-deep wells, short-radius horizontal wells and high-acidity oil and gas wells.
Titanium alloy drill pipes developed by Grant Prideco of foreign Weatherford subsidiary company and RTI international company are applied to multiple short-radius horizontal well drilling in the United states in 1999-2000, and the titanium alloy drill pipes are proved to have high fatigue life and have superiority for wells with small radius of curvature compared with steel drill pipes. The research on titanium alloy drill rods in China is in the starting stage, researchers actively develop the research on the titanium alloy drill rods made in China, successfully develop titanium alloy drill rod products, and perform well-descending tests on part of oil fields.
The titanium alloy drill rod joint developed at present is manufactured by adopting a process method of machining an inner hole and a joint shape by a titanium alloy bar billet machine, and by adopting the manufacturing method of the titanium alloy drill rod joint, 40-60% of titanium alloy materials are lost in the machining process, so that the manufacturing cost of the titanium alloy drill rod joint is seriously influenced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the preparation method of the titanium alloy drill rod joint, which has the advantages of good product comprehensive performance, material cost saving and the like, and solves the problem that 40-60% of titanium alloy material is lost in the processing process and the manufacturing cost of the titanium alloy drill rod joint is seriously influenced.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a titanium alloy drill rod joint comprises the following steps:
1) performing primary radial forging on the titanium alloy bar blank;
2) drilling a center of the titanium alloy bar blank to manufacture a titanium alloy tube blank;
3) performing secondary radial forging on the titanium alloy pipe blank;
4) carrying out perforation variable-section radial forging on the titanium alloy tube blank;
5) carrying out heat treatment on the variable cross-section titanium alloy pipe;
6) sawing the variable cross-section titanium alloy pipe and roughly processing a joint;
7) and (3) performing finish machining and thread machining on the inner surface and the outer surface of the titanium alloy drill rod joint.
Further, the first diameter forging in the step 1) is specifically as follows: heating the titanium alloy bar blank subjected to free forging to 1000-1050 ℃, preserving heat for 60min, and performing primary radial forging by using a common radial forging hammer, wherein the section change ratio of the titanium alloy bar blank subjected to primary radial forging is 25-40%.
Further, the central drilling in the step 2) is specifically as follows: and cooling the titanium alloy bar blank subjected to the first radial forging to room temperature, performing outer surface rough machining, and performing center drilling to obtain a titanium alloy tube blank.
Further, the second diameter forging in the step 3) is specifically: heating the titanium alloy pipe blank to 900-950 ℃, preserving heat for 60min, inserting a core rod into the center of the titanium alloy pipe blank, and performing secondary radial forging by using a common radial forging hammer, wherein the change ratio of the section of the titanium alloy pipe blank after the secondary radial forging is 15-30%.
Further, the step 4) of reducing the cross section of the through hole specifically comprises: heating the titanium alloy tube blank subjected to the second radial forging to 900-950 ℃, preserving heat for 60min, inserting a core rod into the center of the titanium alloy tube blank, performing local third radial forging on the designated position of the titanium alloy tube blank by using a customized trapezoidal radial forging hammer head, and forming the variable-section titanium alloy tube blank after the third radial forging, wherein the maximum section change ratio is less than 50%.
Further, the heat treatment of the variable cross-section titanium alloy tube in the step 5) specifically comprises the following steps: and heating the titanium alloy bar blank with the variable cross section formed after the third radial forging to 900-950 ℃, preserving the heat for 60min, and slowly cooling to room temperature.
Further, the titanium alloy drill rod joint material comprises the following chemical components: 5.5 to 6.5% of All, 3.5 to 4.5% of V, Zr: 1.2-2.0%, Mo: 0.8-1.5 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.03 percent of H, less than or equal to 0.0125 percent of O, less than or equal to 0.1 percent of O and the balance of Ti.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a titanium alloy drill rod joint, which has the following beneficial effects:
according to the preparation method of the titanium alloy drill rod joint, the titanium alloy drill rod joint is prepared by performing diameter forging, perforation variable cross section diameter forging and heat treatment on the variable cross section titanium alloy thick-wall pipe, the microstructure of the product is uniform, the mechanical property is excellent, and the material cost is saved.
Drawings
FIG. 1 is a schematic structural view of a titanium alloy thick-wall pipe with a variable cross-section obtained by the method for manufacturing the titanium alloy drill pipe joint;
FIG. 2 is a schematic structural view of a male joint of a titanium alloy drill pipe obtained by the method for manufacturing the titanium alloy drill pipe joint;
fig. 3 is a schematic view of a titanium alloy drill pipe female joint structure obtained by the titanium alloy drill pipe joint manufacturing method provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Selecting 5.5-6.5% of All, 3.5-4.5% of V and Zr: 1.2-2.0%, Mo: 0.8-1.5 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.03 percent of H, less than or equal to 0.0125 percent of O, less than or equal to 0.1 percent of O and the balance of Ti. Al: 6%, V: 4 percent, and the balance of Ti, the chemical element proportion is the optimization of TC4 material, belongs to alpha + beta type titanium alloy, and has excellent comprehensive mechanical property. Smelting an ingot in a vacuum furnace and freely forging to prepare a titanium alloy bar blank with the specification of phi 280 multiplied by 1500 mm;
the first embodiment is as follows:
performing primary radial forging on the titanium alloy bar blank, heating the titanium alloy bar blank with the specification of phi 280 multiplied by 1500mm to 1030 ℃, preserving the heat for 60min, performing primary radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy bar blank with the specification of phi 235mm multiplied by 2100mm after the primary radial forging to room temperature;
machining a central hole with the diameter phi of 45mm and roughly machining the outer surface of the titanium alloy bar blank with the diameter phi of 235mm multiplied by 2100 mm;
performing second radial forging on the titanium alloy pipe blank, namely heating the titanium alloy pipe blank to 930 ℃, preserving the heat for 60min, inserting a core rod with the diameter of phi 45mm into the center of the titanium alloy pipe blank, performing second radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy pipe blank to room temperature, and performing rough machining on the inner surface and the outer surface of the titanium alloy pipe blank, wherein the outer diameter of the titanium alloy pipe blank after the second radial forging is phi 210mm, and the inner diameter of the titanium alloy pipe blank is phi 50 mm;
the titanium alloy tube blank is punched, subjected to variable cross-section radial forging, namely, the titanium alloy tube blank subjected to the second radial forging is heated to 940 ℃, the temperature is kept for 60min, a phi 50mm core rod is inserted into the center of the titanium alloy tube blank, a customized trapezoidal radial forging hammer is adopted to perform local third radial forging on a specified position of the titanium alloy tube blank, the variable cross-section titanium alloy tube blank is formed after the third radial forging, the outer diameter phi of the large cross section is 200mm, the outer diameter phi of the small cross section is 170mm, and the inner diameter phi of the small cross section is 53mm, and the titanium alloy tube blank is slowly cooled to room temperature, and the inner surface and the outer surface are subjected to rough machining;
and (3) performing heat treatment on the variable cross-section titanium alloy pipe, namely heating the variable cross-section titanium alloy bar blank formed after the third radial forging to 930 ℃, preserving heat for 60min, and slowly cooling to room temperature.
Sawing a titanium alloy pipe with a variable cross section, roughly machining a connector, and finely machining the inner surface and the outer surface of a titanium alloy drill rod connector and machining threads;
by the processing of the embodiment, the tensile strength of the titanium alloy drill rod joint is 942MPa, the yield strength is 866MPa, and the elongation is 16%.
Example two:
performing primary radial forging on the titanium alloy bar blank, heating the titanium alloy bar blank with the specification of phi 280 multiplied by 1500mm to 1050 ℃, preserving the heat for 60min, performing primary radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy bar blank with the specification of phi 235mm multiplied by 2100mm after the primary radial forging to room temperature;
machining a central hole with the diameter phi of 45mm and roughly machining the outer surface of the titanium alloy bar blank with the diameter phi of 235mm multiplied by 2100 mm;
performing secondary radial forging on the titanium alloy pipe blank, namely heating the titanium alloy pipe blank to 950 ℃, preserving the heat for 60min, inserting a core rod with the diameter of phi 45mm into the center of the titanium alloy pipe blank, performing secondary radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy pipe blank to room temperature, and performing rough machining on the inner surface and the outer surface of the titanium alloy pipe blank, wherein the outer diameter of the titanium alloy pipe blank after the secondary radial forging is phi 210mm, and the inner diameter of the titanium alloy pipe blank is phi 50 mm;
the titanium alloy tube blank is punched, subjected to variable cross-section radial forging, namely, the titanium alloy tube blank subjected to the second radial forging is heated to 950 ℃, the temperature is kept for 60min, a phi 50mm core rod is inserted into the center of the titanium alloy tube blank, a customized trapezoidal radial forging hammer is adopted to perform local third radial forging on a specified position of the titanium alloy tube blank, the variable cross-section titanium alloy tube blank is formed after the third radial forging, the outer diameter phi of the large cross section is 200mm, the outer diameter phi of the small cross section is 170mm, and the inner diameter phi of the small cross section is 53mm, and the titanium alloy tube blank is slowly cooled to room temperature, and the inner surface and the outer surface are subjected to rough machining;
and (3) performing heat treatment on the variable cross-section titanium alloy pipe, namely heating the variable cross-section titanium alloy bar blank formed after the third radial forging to 950 ℃, preserving the heat for 60min, and slowly cooling to room temperature.
Sawing a titanium alloy pipe with a variable cross section, roughly machining a connector, and finely machining the inner surface and the outer surface of a titanium alloy drill rod connector and machining threads;
by processing in this example 2, the titanium alloy drill pipe joint obtained has a tensile strength of 923MPa, a yield strength of 848MPa and an elongation of 17%
Example three:
performing primary radial forging on the titanium alloy bar blank, heating the titanium alloy bar blank with the specification of phi 280 multiplied by 1500mm to 1000 ℃, preserving the heat for 60min, performing primary radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy bar blank with the specification of phi 235mm multiplied by 2100mm after the primary radial forging to room temperature;
machining a central hole with the diameter phi of 45mm and roughly machining the outer surface of the titanium alloy bar blank with the diameter phi of 235mm multiplied by 2100 mm;
performing secondary radial forging on the titanium alloy pipe blank, namely heating the titanium alloy pipe blank to 900 ℃, preserving the heat for 60min, inserting a core rod with the diameter of phi 45mm into the center of the titanium alloy pipe blank, performing secondary radial forging by adopting a common radial forging hammer head, slowly cooling the titanium alloy pipe blank to the room temperature, and performing rough machining on the inner surface and the outer surface, wherein the outer diameter of the titanium alloy pipe blank after the secondary radial forging is phi 210mm, and the inner diameter of the titanium alloy pipe blank is phi 50 mm;
the titanium alloy tube blank is punched, subjected to variable cross-section radial forging, namely, the titanium alloy tube blank subjected to the second radial forging is heated to 900 ℃, the temperature is kept for 60min, a phi 50mm core rod is inserted into the center of the titanium alloy tube blank, a customized trapezoidal radial forging hammer is adopted to perform local third radial forging on a specified position of the titanium alloy tube blank, the variable cross-section titanium alloy tube blank is formed after the third radial forging, the outer diameter phi of the large cross section is 200mm, the outer diameter phi of the small cross section is 170mm, and the inner diameter phi of the small cross section is 53mm, and the titanium alloy tube blank is slowly cooled to room temperature, and the inner surface and the outer surface are subjected to rough machining;
and (3) performing heat treatment on the variable cross-section titanium alloy pipe, namely heating the variable cross-section titanium alloy bar blank formed after the third radial forging to 900 ℃, preserving the heat for 60min, and slowly cooling to room temperature.
Sawing a titanium alloy pipe with a variable cross section, roughly machining a connector, and finely machining the inner surface and the outer surface of a titanium alloy drill rod connector and machining threads;
by the processing of the embodiment, the tensile strength of the titanium alloy drill rod joint is 961MPa, the yield strength is 894MPa, and the elongation is 14%.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The preparation method of the titanium alloy drill rod joint is characterized by comprising the following steps of:
1) performing primary radial forging on the titanium alloy bar blank;
2) drilling a center of the titanium alloy bar blank to manufacture a titanium alloy tube blank;
3) performing secondary radial forging on the titanium alloy pipe blank;
4) carrying out perforation variable-section radial forging on the titanium alloy tube blank;
5) carrying out heat treatment on the variable cross-section titanium alloy pipe;
6) sawing the variable cross-section titanium alloy pipe and roughly processing a joint;
7) and (3) performing finish machining and thread machining on the inner surface and the outer surface of the titanium alloy drill rod joint.
2. The method for preparing the titanium alloy drill rod joint as recited in claim 1, wherein the first radial forging in the step 1) is specifically as follows: heating the titanium alloy bar blank subjected to free forging to 1000-1050 ℃, preserving heat for 60min, and performing primary radial forging by using a common radial forging hammer, wherein the section change ratio of the titanium alloy bar blank subjected to primary radial forging is 25-40%.
3. The method for preparing the titanium alloy drill pipe joint as recited in claim 1, wherein the center drilling in the step 2) is specifically as follows: and cooling the titanium alloy bar blank subjected to the first radial forging to room temperature, performing outer surface rough machining, and performing center drilling to obtain a titanium alloy tube blank.
4. The method for preparing the titanium alloy drill rod joint as recited in claim 1, wherein the second radial forging in the step 3) is specifically as follows: heating the titanium alloy pipe blank to 900-950 ℃, preserving heat for 60min, inserting a core rod into the center of the titanium alloy pipe blank, and performing secondary radial forging by using a common radial forging hammer, wherein the change ratio of the section of the titanium alloy pipe blank after the secondary radial forging is 15-30%.
5. The method for preparing the titanium alloy drill pipe joint as recited in claim 1, wherein the step 4) of perforated variable-section radial forging comprises the following steps: heating the titanium alloy tube blank subjected to the second radial forging to 900-950 ℃, preserving heat for 60min, inserting a core rod into the center of the titanium alloy tube blank, performing local third radial forging on the designated position of the titanium alloy tube blank by using a customized trapezoidal radial forging hammer head, and forming the variable-section titanium alloy tube blank after the third radial forging, wherein the maximum section change ratio is less than 50%.
6. The method for preparing the titanium alloy drill rod joint as recited in claim 1, wherein the heat treatment of the titanium alloy pipe with the variable cross section in the step 5) is specifically as follows: and heating the titanium alloy bar blank with the variable cross section formed after the third radial forging to 900-950 ℃, preserving the heat for 60min, and slowly cooling to room temperature.
7. The method for preparing the titanium alloy drill pipe joint according to claim 1, wherein the chemical composition of the titanium alloy drill pipe joint material comprises: 5.5 to 6.5% of All, 3.5 to 4.5% of V, Zr: 1.2-2.0%, Mo: 0.8-1.5 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.03 percent of H, less than or equal to 0.0125 percent of O, less than or equal to 0.1 percent of O and the balance of Ti.
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Cited By (1)
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