阅读说明：本技术 一种钛合金钻杆管体管端镦粗工艺 (Pipe end upsetting process for titanium alloy drill pipe body ) 是由 刘永刚 张献才 张海超 于 2021-07-06 设计创作，主要内容包括：本发明提供一种钛合金钻杆管体管端镦粗工艺,打开内层挡板A,管体及CO-(2)进入加热炉充气4秒后,加热线圈加热；先加热至720℃保温2min,再加热至1010℃保温3min；管体前移至镦粗位置固定8s,内层挡板B打开,冲头进入镦粗模具；成型后冲头退出镦粗模具,内层挡板B关闭；管体在加热炉停留80s后退出加热炉,关闭内层挡板A,停止充入CO-(2)；优点为：本发明将加热炉与镦粗模具连接形成相对密封的空间,在该空间内充入性能稳定且密度大于空气的CO-(2),隔绝高温下的管体与氧气接触,避免管体镦粗成型部位因氧化皮导致的夹杂、折叠、裂纹等缺陷,降低管体表面金属氧化的风险,提升管体镦粗质量,提高钻杆生产的合格率,降低生产成本。(The invention provides a pipe end upsetting process for a titanium alloy drill pipe body, which comprises the steps of opening an inner layer baffle A, opening the pipe body and CO 2 After entering a heating furnace for charging air for 4 seconds, heating by a heating coil; heating to 720 deg.C, keeping the temperature for 2min, heating to 1010 deg.C, and keeping the temperature for 3 min; the pipe body is moved forwards to an upsetting position and is fixed for 8s, the inner baffle B is opened, and the punch enters an upsetting die; after the forming, the punch head is withdrawn from the upsetting die, and the inner baffle B is closed; the tube body stays in the heating furnace for 80s and then is withdrawn out of the heating furnace, the inner baffle A is closed, and CO charging is stopped 2 (ii) a Has the advantages that: the heating furnace and the upsetting die are connected to form a relatively sealed space, and CO with stable performance and density higher than air is filled into the space 2 Isolating the tube body from oxygen at high temperatureThe contact avoids the defects of inclusion, folding, cracks and the like of the upsetting forming part of the pipe body due to oxide skin, reduces the risk of metal oxidation on the surface of the pipe body, improves the upsetting quality of the pipe body, improves the qualified rate of the production of the drill rod and reduces the production cost.)

1. The utility model provides a titanium alloy drilling rod body pipe end upsetting process, titanium alloy drilling rod body pipe end upsetting equipment includes heating furnace, heating coil, upsetting die, drift, heat insulating part, baffle A and baffle B, its characterized in that: the heating furnace and the upsetting die are hollow, a heat insulation piece is arranged between the heating furnace and the upsetting die, a heating coil is arranged on the inner wall of the heating furnace, a gas channel is arranged at the bottom of the heating furnace, a baffle A is arranged at one end of the heating furnace, the baffle A comprises an outer baffle A and an inner baffle A, the number of the inner baffles A is 2, the inner baffles A are movably connected to the end part of the heating furnace, the outer baffle A is fixedly arranged on the outer side of the inner baffle A, the number of the outer baffles A is 2, a round hole is formed in the middle of the outer baffle A, and the inner diameter of the round hole is equivalent to the outer diameter of the titanium alloy drill rod body; the upsetting die is characterized in that a baffle B is installed at one end of the upsetting die and comprises an outer baffle B and an inner baffle B, the number of the inner baffle B is 2, the inner baffle B is movably connected to the end portion of the upsetting die, the outer baffle B is fixedly installed on the outer side of the inner baffle B, the number of the outer baffle B is 2, a round hole is formed in the middle of the outer baffle B, and the inner diameter of the round hole is equal to the outer diameter of a punch.

2. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the baffle A is a heat-resistant baffle, and the baffle B is a heat-resistant baffle.

3. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the inner-layer baffle A is rectangular, and the inner-layer baffle B is rectangular.

4. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the inner diameter of the round hole of the outer baffle A is 2-5mm larger than the outer diameter of the titanium alloy drill pipe body.

5. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the inner diameter of the round hole of the outer baffle B is 2-4mm larger than the outer diameter of the punch.

6. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the heating coil is 250-450 mm in length, and the highest heating temperature is not less than 1300 ℃.

7. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1 or 6, wherein the upsetting process comprises the following steps: the heating temperature and the heating time of the heating coil are controllable, and the titanium alloy drill rod pipe body is heated in a stepped mode.

8. The upsetting process for the pipe end of the titanium alloy drill pipe body according to claim 1, wherein the upsetting process comprises the following steps: the protective gas injected into the heating furnace through the gas channel is CO₂。

9. The upsetting process for the pipe end of the titanium alloy drill pipe body according to any one of claims 1 to 8, wherein:

the process flow of upsetting the pipe end of the titanium alloy drill pipe body is as follows:

1) closing the heat insulation piece, opening an inner baffle A at the front end of the heating furnace, enabling the titanium alloy drill pipe body to penetrate through the outer baffle A to enter the heating furnace, and protecting gas CO₂Enters the heating furnace through the gas channel and protects the gas CO₂The flow rate of the inflating gas is 13L/s, and after the heating furnace is inflated for 4 seconds, the heating coil begins to heat the pipe end of the titanium alloy drill pipe body;

2) heating the titanium alloy drill pipe body in a stepped manner, heating to 720 ℃, preserving heat for 2min, heating to 1010 ℃, preserving heat for 3min, and then stopping heating by the heating coil;

3) opening the heat insulation piece, moving the titanium alloy drill rod pipe body forwards to the upsetting position of the upsetting die, clamping and fixing, and simultaneously protecting CO gas₂Adjusting the inflation flow rate to 40L/s, opening an inner layer baffle B at the rear end of the upsetting die after the titanium alloy drill rod pipe body moves forwards to the upsetting position of the upsetting die for 8s, and allowing a punch to penetrate through the outer layer baffle B and enter the upsetting die to upset the pipe end of the titanium alloy drill rod pipe body;

4) after the pipe end of the titanium alloy drill pipe body is subjected to upsetting forming, the punch is withdrawn from the upsetting die, and an inner baffle B at the rear end of the upsetting die is closed;

5) upsetting and forming the titanium alloy drill pipe body at the pipe end, retreating to the heating furnace, closing the heat insulation piece, stopping the drill pipe body for 80s, retreating out of the heating furnace, closing an inner layer baffle A at the front end of the heating furnace, and stopping filling the protective gas; the temperature of the pipe end of the titanium alloy drill pipe body is reduced to 600 ℃, and the next manufacturing procedure is carried out.

Technical Field

The invention relates to the technical field of pipe end upsetting of a drill pipe body, in particular to a pipe end upsetting process of a titanium alloy drill pipe body.

Background

The titanium alloy drill rod used in the exploration and development of petroleum and natural gas has the characteristics of corrosion resistance, low density, high strength and good elasticity, and is applied to the drilling operation of high-acidity oil and gas reservoirs, ultra-deep wells and ultra-short horizontal wells. Meanwhile, the titanium alloy is a precious metal, the material cost of the titanium alloy is about 25 times that of the steel drill rod, and the titanium alloy material has strong oxidizability and is easy to oxidize under a high-temperature condition to form an oxide layer. Therefore, in the upsetting link of the end part of the pipe body in the manufacturing process of the titanium alloy drill pipe, the titanium alloy drill pipe and oxygen are subjected to oxidation reaction at high temperature to form an oxidation layer, and the thickness of the oxidation layer is thicker along with the increase of the heating temperature and the increase of the heating time, so that the inclusion of the oxidation layer on the surface of the pipe body and the initiation of surface cracks are easily caused during upsetting, the machining allowance of the pipe end is increased, the upsetting qualification rate is reduced, the production and manufacturing cost is increased, and the application and popularization of the titanium alloy drill pipe are seriously restricted.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a pipe end upsetting process of a titanium alloy drill pipe body.

The new technical scheme of the invention is as follows: a pipe end upsetting process of a titanium alloy drill pipe body comprises a heating furnace, a heating coil, an upsetting die, a punch, a heat insulation piece, a baffle A and a baffle B, wherein the heating furnace and the upsetting die are hollow, the heat insulation piece is assembled between the heating furnace and the upsetting die, the heating coil is installed on the inner wall of the heating furnace, a gas channel is arranged at the bottom of the heating furnace, the baffle A is installed at one end of the heating furnace and comprises an outer baffle A and an inner baffle A, the inner baffle A is 2, the inner baffle A is movably connected to the end of the heating furnace, the outer baffle A is fixedly installed on the outer side of the inner baffle A, the outer baffle A is 2, a round hole is formed in the middle of the outer baffle A, and the inner diameter of the round hole is equal to the outer diameter of the titanium alloy drill pipe body; the upsetting die is characterized in that a baffle B is installed at one end of the upsetting die and comprises an outer baffle B and an inner baffle B, the number of the inner baffle B is 2, the inner baffle B is movably connected to the end portion of the upsetting die, the outer baffle B is fixedly installed on the outer side of the inner baffle B, the number of the outer baffle B is 2, a round hole is formed in the middle of the outer baffle B, and the inner diameter of the round hole is equal to the outer diameter of a punch.

The baffle A is a heat-resistant baffle, and the baffle B is a heat-resistant baffle.

The inner-layer baffle A is rectangular, and the inner-layer baffle B is rectangular.

The inner diameter of the round hole of the outer baffle A is 2-5mm larger than the outer diameter of the titanium alloy drill pipe body.

The inner diameter of the round hole of the outer baffle B is 2-4mm larger than the outer diameter of the punch.

The heating coil is 250-450 mm in length, and the highest heating temperature is not less than 1300 ℃.

The heating temperature and the heating time of the heating coil are controllable, and the titanium alloy drill rod pipe body is heated in a stepped mode.

The protective gas injected into the heating furnace through the gas channel is CO₂。

The process flow of upsetting the pipe end of the titanium alloy drill pipe body is as follows:

1) closing the heat insulation piece, opening an inner baffle A at the front end of the heating furnace, enabling the titanium alloy drill pipe body to penetrate through the outer baffle A to enter the heating furnace, and protecting gas CO₂Enters the heating furnace through the gas channel and protects the gas CO₂The flow rate of the inflating gas is 13L/s, and after the heating furnace is inflated for 4 seconds, the heating coil begins to heat the pipe end of the titanium alloy drill pipe body;

2) heating the titanium alloy drill pipe body in a stepped manner, heating to 720 ℃, preserving heat for 2min, heating to 1010 ℃, preserving heat for 3min, and then stopping heating by the heating coil;

3) opening the heat insulation piece, moving the titanium alloy drill rod pipe body forwards to the upsetting position of the upsetting die, clamping and fixing, and simultaneously protecting CO gas₂The aeration flow rate is adjusted to 40L/s, after the titanium alloy drill pipe body moves forwards to the upsetting position of the upsetting die for 8s, the rear end of the upsetting dieThe inner baffle B is opened, and the punch penetrates through the outer baffle B and enters the upsetting die to upset the pipe end of the titanium alloy drill pipe body;

4) after the pipe end of the titanium alloy drill pipe body is subjected to upsetting forming, the punch is withdrawn from the upsetting die, and an inner baffle B at the rear end of the upsetting die is closed;

5) upsetting and forming the titanium alloy drill pipe body at the pipe end, retreating to the heating furnace, closing the heat insulation piece, stopping the drill pipe body for 80s, retreating out of the heating furnace, closing an inner layer baffle A at the front end of the heating furnace, and stopping filling the protective gas; the temperature of the pipe end of the titanium alloy drill pipe body is reduced to 600 ℃, and the next manufacturing procedure is carried out.

The invention has the beneficial effects that: the heating furnace and the upsetting die are connected to form a relatively sealed space, and CO with stable performance and density higher than air is filled into the space₂The pipe body is isolated from being contacted with oxygen at high temperature, so that the defects of inclusion, folding, cracks and the like of the upsetting forming part of the pipe body due to oxide skin are avoided, the risk of metal oxidation on the surface of the pipe body is reduced, the upsetting quality of the pipe body is improved, the qualified rate of drill rod production is improved, and the production cost is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the baffle a.

Wherein: 1. the pipe comprises a heating furnace, 2, a heating coil, 3, an upsetting die, 4, a punch, 5, a heat insulation piece, 6, baffles A and 601, outer-layer baffles A and 602, inner-layer baffles A and 7, baffles B and 701, outer-layer baffles B and 702, inner-layer baffles B and 8, a titanium alloy drill pipe body, 9 and a gas channel.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention is described in further detail below with reference to the accompanying drawings:

the pipe end upsetting process of the titanium alloy drill pipe body 8 comprises a heating furnace 1, a heating coil 2, an upsetting die 3, a punch 4, a heat insulation piece 5, a baffle A6 and a baffle B7, wherein the heating furnace 1 and the upsetting die 3 are hollow, the heating furnace 1 and the upsetting die 3 are connected through a heat insulation piece 5, the heating coil 2 is arranged on the inner wall of the heating furnace 1, the bottom of the heating furnace 1 is provided with a gas channel 9, one end of the heating furnace 1 is provided with a baffle A6, the baffle A6 comprises an outer baffle A601 and an inner baffle A602, the inner baffle A602 is 2 pieces, the inner baffle A602 is movably connected with the end part of the heating furnace 1, the outer baffle A601 is fixedly arranged at the outer side of the inner baffle A602, the number of the outer baffle A601 is 2, a round hole is formed in the middle of the outer baffle A601, and the inner diameter of the round hole is equal to the outer diameter of the titanium alloy drill pipe body 8; the upsetting die is characterized in that a baffle B7 is installed at one end of the upsetting die 3, the baffle B7 comprises an outer baffle B701 and an inner baffle B702, the number of the inner baffles B702 is 2, the inner baffles B702 are movably connected to the end of the upsetting die 3, the outer baffle B701 is fixedly installed on the outer side of the inner baffle B702, the number of the outer baffles B701 is 2, a circular hole is formed in the middle of each outer baffle B701, and the inner diameter of the circular hole is equal to the outer diameter of the punch 4.

The baffle A6 is a heat-resistant baffle, and the baffle B7 is a heat-resistant baffle.

The inner baffle A602 is rectangular, and the inner baffle B702 is rectangular.

The inner diameter of the round hole of the outer baffle A601 is 2-5mm larger than the outer diameter of the titanium alloy drill pipe body 8.

The inner diameter of the round hole of the outer baffle B701 is 2-4mm larger than the outer diameter of the punch 4.

The length of the heating coil 2 is 250-450 mm, and the highest heating temperature is not less than 1300 ℃.

The heating temperature and the heating time of the heating coil 2 are controllable, and the titanium alloy drill rod pipe body 8 is heated in a stepped mode.

The protective gas injected into the heating furnace 1 through the gas channel 9 is CO₂。

The process flow of upsetting the pipe end of the titanium alloy drill pipe body is as follows:

1) closing the heat insulation piece 5, opening an inner baffle A602 at the front end of the heating furnace 1, enabling the titanium alloy drill pipe body 8 to penetrate through the outer baffle A601 to enter the heating furnace 1, and protecting gas CO₂Enters the heating furnace 1 through the gas channel 9 and protects the gas CO₂The aeration flow rate is 13L/s, and after the heating furnace 1 is aerated for 4 seconds, the heating coil 2 starts to heat the pipe end of the titanium alloy drill pipe body 8;

2) heating the titanium alloy drill pipe body 8 in a stepped manner to 720 ℃, preserving heat for 2min, heating to 1010 ℃, preserving heat for 3min, and then stopping heating by the heating coil 2;

3) the heat insulation piece 5 is opened, the titanium alloy drill rod pipe body 8 moves forwards to the upsetting position of the upsetting die 3 and is clamped and fixed, and meanwhile, the protective gas CO is used₂The aeration flow rate is adjusted to be 40L/s, after the titanium alloy drill rod pipe body 8 moves forwards to the upsetting position 8s of the upsetting die 3, the inner-layer baffle B702 at the rear end of the upsetting die 3 is opened, and the punch 4 penetrates through the outer-layer baffle B701 and enters the upsetting die 3 to upset the pipe end of the titanium alloy drill rod pipe body 8;

4) after the pipe end of the titanium alloy drill pipe body 8 is subjected to upsetting forming, the punch 4 is withdrawn from the upsetting die 3, and an inner-layer baffle B702 at the rear end of the upsetting die 3 is closed;

5) upsetting and forming the titanium alloy drill pipe body 8 at the pipe end, retreating to the heating furnace 1, closing the heat insulation piece 5, stopping the drill pipe body for 80 seconds, retreating to the heating furnace 1, closing an inner layer baffle A602 at the front end of the heating furnace 1, and stopping filling the protective gas; the temperature of the pipe end of the titanium alloy drill pipe body 8 is reduced to 600 ℃, and the next manufacturing procedure is carried out.

Through the upsetting process of the pipe end of the titanium alloy drill pipe body 8, oxide layers on the inner surface and the outer surface of the titanium alloy drill pipe body 8 can be controlled within 150 microns, and defects of inclusion, folding, cracks and the like caused by the oxide layers at an upsetting forming part can be effectively avoided.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.