CN115229121A - Manufacturing method of hydraulic pulsation oscillator with complex inner cavity structure - Google Patents

Abstract

The invention discloses a manufacturing method of a hydraulic pulsation oscillator with a complex inner cavity structure. A mixture of 200mu zircon powder and 80-100mu zircon sand is used to form a 1:35 mixture to form a refractory skeleton, and a refractory skeleton is carried out on the periphery of the refractory skeleton. The structural layer is coated, dried at a constant temperature of 20°C, then hardened and dried at a temperature of 24±2°C and a humidity of 35±5%RH, then dewaxed, and the shell is heated to 800-950°C for a period of time Time, casting temperature of 1500 ℃, the casting can be carried out; it is produced by an investment casting method with a built-in core, the casting process is easy to operate, and the product quality is easy to grasp, considering the working conditions and functionality of the internal cavity Therefore, the ceramic core is used as the cavity forming medium, so that the inner wall is complete and smooth without defects, so that the overall integrated precision casting process can improve the strength of the workpiece, and it is faster, more efficient, more economical, more in line with technical and market needs, and can further increase the The safety factor during use should be easy to vigorously promote and apply.

Description

A kind of manufacturing method of hydraulic pulsation oscillator with complex inner cavity structure

technical field

The invention relates to the technical field of precision casting technology of a hydraulic pulsation oscillator, in particular to a manufacturing method of a hydraulic pulsation oscillator with a complex inner cavity structure.

Background technique

In the process of oil and natural gas development, it involves a technical field of hydraulic pulsation casing. The mechanical vibration of the downhole drill string has obvious effects on reducing the friction of the drill string, alleviating the drag pressure and improving the machine speed. The traditional mechanical excitation The way to vibrate is to use a vibrator. At present, there are two kinds of vibration excitation methods for widely used vibrators: mechanical excitation and resonance excitation. When the mechanical vibration exciter is used for excitation, there are disadvantages such as short vibration propagation distance, high position sensitivity, and complex structure. , When using the resonance excitation vibrator for excitation, there is a disadvantage of low vibration efficiency. Therefore, in the cementing process of extended-reach wells and horizontal wells, some domestic oil fields have used new hydraulic pulsating vibrators. Solve a series of problems such as high friction resistance and well control risk when running casing.

Because the internal structure of the vibrator is relatively complex, it is generally completed by a process of half-processing and then electron beam welding, but the processing is relatively difficult, and the electron beam welding requires very high quality and high cost.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for making a hydraulic pulsation oscillator with a complex inner cavity structure. By using one-piece precision casting of the oscillator, the structure ensures that the inner wall of the flow channel is regular and smooth, the quality is stable, and the anti-wear performance is ensured. It has the characteristics of high strength and long service life, which further improves the practicability and safety, and can effectively solve the problems in the background technology.

To achieve the above object, the present invention provides the following technical solutions:

A manufacturing method of a hydraulic pulsation oscillator with a complex inner cavity structure, the manufacturing method comprising the following steps:

S1: Take 200mu zircon powder and 80-100mu zircon sand to form a mixture of 1:35 to form a refractory skeleton, and coat a structural layer on the periphery of the refractory skeleton;

S2: Dry at a constant temperature of 20°C, then harden and dry at a temperature of 24±2°C and a humidity of 35±5% RH, then dewax, and heat the shell to 800-950°C for a period of time before casting When the temperature is 1500 ° C, the casting can be carried out, and finally the casting is formed.

As a further scheme of the present invention: the coating structure layer is a silica sol coating layer, the formed casting has high dimensional accuracy and good surface finish, and the outermost layer is coated with a mullite sand reinforcement layer to form a blank.

As a further scheme of the present invention: also include a casting step, specifically:

The steel is smelted in an intermediate frequency smelting furnace, using Q10 pig iron or high-carbon cast iron as the charge, and the molten iron is heated to 1500 °C and released. After the shell is taken out from the roasting furnace, the molten iron is cast at high temperature. At this time, the shell Cool to about 850℃ in the air, and the molten iron has good fluidity when the temperature is 1500℃. At this time, the mold is poured and filled;

The shell mold is roasted in a through-type roasting furnace for 20-30 minutes. Before casting, it is released from the furnace and cast while hot. The outer side of the shell mold is provided with a surrounding mold box. After the casting is completed, the shell mold is surrounded by the surrounding mold box and cooled down. The speed and temperature are slowly lowered from 620°C to 150°C, and then cooled to room temperature naturally, and the casting is full to ensure that the iron hydraulic head is ≥60mm, and a spherical die head is adopted to ensure sufficient feeding capacity;

Insulation treatment spherical die and product casting riser need to be wrapped with insulation cotton for insulation, with a thickness of 30mm and a length of 1000mm;

Cold iron is used at the hot junction, and the gate is used to change the position to make the thickness consistent and speed up the heat dissipation efficiency.

As a further solution of the present invention: a cooling frame is connected to the enclosure through four connecting bars, the cooling frame has a cavity inside, and an opening and closing plate is arranged between each of the connecting bars , the opening and closing plate is hinged with the enclosure formwork box.

As a further solution of the present invention, a sand storage auxiliary box is fixedly connected to the top of the enclosure mold box, a draft cavity is opened in the sand storage auxiliary box, and the enclosure mold box has an interior corresponding to the draft cavity. A flow guide surface, a lifting ring for closing the draft cavity is slidably connected in the sand storage auxiliary box, a sand discharge box is fixedly connected to the bottom of the surrounding mold box, and the sand discharge box has a guiding tapered surface inside The bottom of the sand discharge box is sealed with a main pipe, the outer wall of the main pipe is fixedly connected with several suction bellows, and one end of the several suction bellows is fixed on the top of the sand storage auxiliary box, and is connected with all the suction bellows. The draft cavity is connected.

As a further scheme of the present invention: also include a smelting step, specifically:

By adding ash pig iron, molybdenum iron, alloys that are not easy to melt into the bottom of the furnace, turn on the switch to send electricity, adjust to the maximum power, add Cr last, add scrap steel and scrap parts, and wait for the molten iron in the furnace to melt more than 1/2. Add ferrochrome, the temperature reaches 1400℃ to 1450℃, add ferromanganese, ferrosilicon, and aluminum for deoxidation and then slag, and the temperature reaches 1500℃ to start casting.

As a further solution of the present invention: the reinforcement layer is a mullite sand layer.

As a further solution of the present invention: the cavity used for molding is a ceramic core, and the mold shell has several blind holes.

Compared with the prior art, the beneficial effects of the present invention are:

Taking into account the characteristics of short production cycle, low cost, and stable performance of the workpiece, an investment casting method with built-in core is adopted for production, the casting process is easy to operate, and the product quality is easy to grasp. Taking into account the working conditions and functionality of the internal cavity, the ceramic core is used as the cavity forming medium to make the inner wall complete and smooth without defects, and the blind hole weight reduction treatment is adopted to effectively avoid the casting body being affected by the inner core during the condensation shrinkage process. Expansion and cracking to meet the requirements of the integrity of the overall structure, so that the overall integrated precision casting process improves the strength of the workpiece, and is more efficient, efficient and economical, more in line with technical and market needs, and can further increase the safety during use. coefficient, it should be easy to promote and apply vigorously.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a kind of schematic diagram of the manufacturing method of the hydraulic pulsation oscillator with complex inner cavity structure;

Fig. 2 is a kind of structure schematic diagram of enclosing mould box in the manufacture method of the hydraulic pulsation oscillator with complex inner cavity structure;

3 is a schematic structural diagram of the interior of the enclosure mold box in a method for making a hydraulic pulsating oscillator with a complex inner cavity structure;

4 is a schematic structural diagram of a sand storage auxiliary box in a method for manufacturing a hydraulic pulsation oscillator with a complex inner cavity structure.

In the figure: 1. Enclosing mold box; 11. Entering cavity; 12. Diversion surface; 13. Connecting strip; 14. Opening and closing plate; 15. Cooling partition; 2. Sand storage auxiliary box; 21. Draft cavity; 22. Lifting ring; 3. Sand discharge box; 31. Conical surface; 4. Main pipe; 5. Suction bellows.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1:

Referring to FIG. 1 , in the embodiment of the present invention, a method for manufacturing a hydraulic pulsating oscillator with a complex inner cavity structure adopts 200mu zircon powder and 80-100mu zircon sand to form a mixture of 1:35 to form a refractory framework. The periphery of the refractory skeleton is coated with a structural layer. The coated structural layer is a silica sol coating layer. The formed casting has high dimensional accuracy and good surface finish. The outermost layer is coated with a mullite sand reinforcement layer to form a blank. It is dried under the condition of 20°C, and then hardened and dried at a temperature of 24±2°C and a humidity of 35±5% RH, and then dewaxed. The shell is heated to 800-950°C for a period of time, and the casting temperature is 1500°C. Casting can be carried out, and finally the castings are formed. The vertical tree group casting process is adopted, which is easy to operate and the product quality is easy to grasp. The steel is smelted in an intermediate frequency melting furnace. The charge is Q10 pig iron or high carbon cast iron, and the design adopts low temperature wax material. , made by composite process, the size of the casting is large, using 8 and a half layers of paint, the molten iron is heated to 1500 ℃ and released, after the shell is taken out from the roasting furnace, the molten iron is cast at high temperature, and the shell is cooled in the air at this time When the temperature of molten iron reaches about 850°C, the fluidity is very good at 1500°C. At this time, the casting mold is filled, and the shell mold is roasted in a through-type roaster for 20-30 minutes. Immediately surround the shell mold with sand to reduce the cooling rate to prevent the casting from cracking. The temperature is slowly lowered from 620 ° C to 150 ° C and then cooled to room temperature naturally. The casting is full to ensure that the iron hydraulic head is ≥ 60mm. By adopting a spherical die head In order to have sufficient feeding capacity, thermal insulation treatment of spherical die and product casting riser, it is necessary to use thermal insulation cotton for wrapping insulation, with a thickness of 30mm and a length of 1000mm, using cold iron at the hot junction, and changing the position of the gate to make it The thickness is the same, which is convenient for heat dissipation. At the same time, the size and shape of the gate at the location are changed to speed up its cooling rate. By appropriately increasing the size of the inner runner, the alloy with a large shrinkage tendency is usually designed with a feeding riser, a casting system and a feeding riser. The setting of the mouth should promote the directional feeding in the direction of the riser to achieve the effect of directional feeding. The integrated precision casting process improves the strength of the workpiece, and is more efficient, efficient and economical. It is more in line with technical and market needs, and can be further increased. In order to ensure the safety factor in the use process, it should be easy to vigorously promote the application.

The reinforcement layer is a mullite sand layer; it has the characteristics of high temperature resistance, high strength, small thermal conductivity, and significant energy saving effect, which improves the reinforcement effect.

The cavity used for molding is a ceramic core, and the shell has several blind holes; considering the working conditions and functionality of the internal cavity, the ceramic core is used as the cavity forming medium, so that the inner wall is complete and smooth without defects. To ensure the circulation effect of the casting liquid in the complex inner cavity, according to the different shrinkage rates of the ceramic core and the body, measures are taken to increase the heat preservation to reduce the cooling rate, which can not easily cause the internal expansion to cause the body to crack. The hole weight reduction treatment effectively prevents the casting body from being cracked by the inner core during the condensation and shrinkage process, so as to meet the requirements of the integrity of the overall structure.

Example 2:

Referring to FIGS. 2-4 , in an embodiment of the present invention, a method for manufacturing a hydraulic pulsating oscillator with a complex inner cavity structure, a cooling frame 15 is connected in the enclosing mold box 1 through four connecting bars 13 , and the connecting bars 13 make The enclosure box 1 and the cooling partition frame 15 are connected together, and a cavity can be formed between each connecting bar 13 , the cooling partition frame 15 has an in-mold cavity 11 inside, and each connecting bar 13 is provided with a cavity 11 . The opening and closing plate 14, the opening and closing plate 14 is hinged with the enclosure box 1, the opening and closing plate 14 can be driven to open and close by the motor, so that the top surface of the opening and closing plate 14 can have sand surrounding the cooling frame 15, and the cooling frame 15 encloses the shell mold Hold, reduce the cooling rate to prevent the casting from cracking, the temperature is slowly lowered from 620 ° C to 150 ° C, and then naturally cooled to room temperature, the top of the enclosure box 1 is fixedly connected with a sand storage auxiliary box 2, and the sand storage auxiliary box 2 is open with pull-out Mould cavity 21, the sand can be located in the draft cavity 21, so that the draft cavity 21 can store the sand, so that the sand can be recycled. A lift ring 22 for closing the draft cavity 21 is slidably connected in the auxiliary box 2. The lift ring 22 can be lifted and moved to open the draft cavity 21, and the draft cavity 21 can be discharged by the inclined surface, so that the sand can flow along the guide. The surface 12 is discharged to the top of the opening and closing plate 14, and the lifting ring 22 can close the draft cavity 21, which can be driven by an electric push rod, so that the lifting ring 22 can move automatically, which is convenient for cooling operation, and the bottom of the enclosing mold box 1 is fixed A sand discharge box 3 is connected, the inside of the sand discharge box 3 has a guiding tapered surface 31, the bottom of the sand discharge box 3 is sealed and connected with a main channel 4, and the outer wall of the main channel 44 is fixedly connected with a number of suction bellows 5, a number of suction bellows 5. One end of the bellows 5 is fixed on the top of the sand storage auxiliary box 2 and communicated with the draft cavity 21. When the cooling is completed, the opening and closing plate 14 can be opened to expose the sand and discharge it into the sand discharge box 3. Enter into the main pipe 4, so that the main pipe 4 can divert the sand through a plurality of suction bellows 5, and the suction bellows 5 has suction wind, which can be generated by the fan, so that the sand is located in the suction bellows 5 to circulate, and in the suction bellows 5 A heat dissipation hole can be opened on the top of the suction bellows 5, and after a period of time in the suction bellows 5, the heat can be dissipated to the sand after use, and the suction bellows 5 can be split and discharged into the sand storage auxiliary box 2, so that the sand can be evenly located in the sand storage auxiliary box. Reuse in box 2.

The working principle of the invention is as follows: a vertical tree group casting process is adopted as a whole, and a mixture of 200mu zircon powder and 80-100mu zircon sand is used to form a 1:35 mixture to form a refractory skeleton, and a structural layer is coated on the periphery of the refractory skeleton. , the coating structure layer is a silica sol coating layer, the formed casting has high dimensional accuracy and good surface finish. It is Q10 pig iron or high carbon cast iron, using 8 layers of semi-coating, by first adding gray pig iron, molybdenum iron, and alloys that are not easy to melt into the bottom of the furnace, open the switch to send electricity, adjust to the maximum power, add Cr last, and add scrap steel and scrap , When the molten iron in the furnace exceeds 1/2, add ferrochrome, the temperature reaches 1400℃ to 1450℃, add ferromanganese, ferrosilicon, and aluminum for deoxidation and then slag, and the temperature reaches 1500℃, and the casting begins. After being taken out from the roasting furnace, the molten iron is cast at high temperature. At this time, the mold shell is cooled to about 850 ℃ in the air, and the molten iron has good fluidity when the temperature is 1500 ℃. The through-type roasting furnace is roasted for 20-30 minutes. Before casting, it is released from the furnace and cast while it is hot. Through the lifting movement of the lifting ring 22, the drafting cavity 21 can be opened, and the drafting cavity 21 can be discharged by the inclined surface, so that the sand can follow the The guide surface 12 is discharged to the top of the opening and closing plate 14, so that the top surface of the opening and closing plate 14 can have sand to surround the cooling frame 15, and the cooling frame 15 surrounds the shell mold to reduce the cooling rate and prevent the casting from cracking. After that, by opening the opening and closing plate 14, the sand can be exposed, discharged into the sand discharge box 3, and passed into the main pipe 4, so that the main pipe 4 can divert the sand through the plurality of suction bellows 5, and the sand can be discharged. It is located in the suction bellows 5 and circulates, and after a period of time in the suction bellows 5, heat can be dissipated to the sand after use, and the suction bellows 5 is divided into the sand storage auxiliary box 2, so that the sand can be evenly located in the storage. The sand auxiliary box 2 is used again. After cooling, the temperature is slowly lowered from 620°C to 150°C, and then naturally cooled to room temperature, and finally the casting is formed.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The equivalent replacement or modification of the solution and its inventive concept shall be included within the protection scope of the present invention.

Claims (8)

1. the manufacture method of the hydraulic pulsation oscillator of a complex inner cavity structure, is characterized in that, described manufacture method comprises the following steps: S1: Take 200mu zircon powder and 80-100mu zircon sand to form a mixture of 1:35 to form a refractory skeleton, and coat a structural layer on the periphery of the refractory skeleton; S2: Dry at a constant temperature of 20°C, then harden and dry at a temperature of 24±2°C and a humidity of 35±5% RH, then dewax, and heat the shell to 800-950°C for a period of time before casting When the temperature is 1500 ° C, the casting can be carried out, and finally the casting is formed. 2. the making method of the hydraulic pulsation oscillator of a kind of complex inner cavity structure according to claim 1, is characterized in that, described coating structure layer is silica sol paint layer, and the dimensional accuracy of the casting of molding is high, and the surface finish is Well, the outermost layer is coated with a mullite sand reinforcement layer to form a blank. 3. the manufacture method of the hydraulic pulsation oscillator of a kind of complex inner cavity structure according to claim 1, is characterized in that, also comprises casting step, is specially: The steel is smelted in an intermediate frequency smelting furnace, using Q10 pig iron or high-carbon cast iron as the charge, and the molten iron is heated to 1500 °C and released. After the shell is taken out from the roasting furnace, the molten iron is cast at high temperature. At this time, the shell Cool to about 850℃ in the air, and the molten iron has good fluidity when the temperature is 1500℃. At this time, the mold is poured and filled; The shell mold is roasted in a through-type roasting furnace for 20-30 minutes. Before casting, it is released from the furnace and cast while hot. The outer side of the shell mold is provided with a surrounding mold box. After the casting is completed, the shell mold is surrounded by the surrounding mold box and cooled down. The speed and temperature are slowly lowered from 620°C to 150°C, and then cooled to room temperature naturally, and the casting is full to ensure that the iron hydraulic head is ≥60mm, and a spherical die head is adopted to ensure sufficient feeding capacity; Insulation treatment spherical die and product casting riser need to be wrapped with insulation cotton for insulation, with a thickness of 30mm and a length of 1000mm; Cold iron is used at the hot junction, and the gate is used to change the position to make the thickness consistent and speed up the heat dissipation efficiency. 4. The method for making a hydraulic pulsating oscillator with a complex inner cavity structure according to claim 3, wherein the enclosure mold box is connected with a cooling partition frame through four connecting bars, and the cooling partition The inside of the frame is provided with a mold cavity, and an opening and closing plate is arranged between each of the connecting bars, and the opening and closing plate is hinged with the surrounding mold box. 5. The method for making a hydraulic pulsating oscillator with a complex inner cavity structure according to claim 4, wherein a sand storage auxiliary box is fixedly connected to the top of the enclosure mold box, and the sand storage auxiliary box is provided with a There is a draft cavity, the enclosing mold box has a guide surface corresponding to the draft cavity, and a lifting ring for closing the draft cavity is slidably connected in the sand storage auxiliary box. The bottom of the box is fixedly connected with a sand discharge box, the inside of the sand discharge box has a guiding tapered surface, the bottom of the sand discharge box is sealed and connected with a main channel, and the outer wall of the main channel is fixedly connected with a number of suction bellows, a number of One end of each of the suction bellows is fixed on the top of the sand storage auxiliary box and communicated with the draft cavity. 6. the manufacture method of the hydraulic pulsation oscillator of a kind of complex inner cavity structure according to claim 1, is characterized in that, also comprises smelting step, is specially: By adding ash pig iron, molybdenum iron, alloys that are not easy to melt into the bottom of the furnace, turn on the switch to send electricity, adjust to the maximum power, add Cr last, add scrap steel and scrap parts, and wait for the molten iron in the furnace to melt more than 1/2. Add ferrochrome, the temperature reaches 1400℃ to 1450℃, add ferromanganese, ferrosilicon, and aluminum for deoxidation and then slag, and the temperature reaches 1500℃ and begins to cast. 7 . The method for manufacturing a hydraulic pulsating oscillator with a complex inner cavity structure according to claim 2 , wherein the reinforcement layer is a mullite sand layer. 8 . 8 . The method for manufacturing a hydraulic pulsating oscillator with a complex inner cavity structure according to claim 1 , wherein the cavity used for molding is a ceramic core, and the shell has several blind holes. 9 .

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