Four-way sitting and hanging step applied to high-load working condition

Abstract

The invention discloses a four-way seat hanging step applied to a high-load working condition, and relates to the field of four-way joints for petroleum drilling, the four-way seat hanging step comprises a four-way joint, a seat hanging step body is mounted on the outer wall of the four-way joint, a locking ring is mounted in an inner cavity of the seat hanging step body, and a positioning block is attached to the outer wall of the locking ring; a circular groove is formed in the outer wall of the four-way joint, a second through groove is formed in the bottom of an inner cavity of the sitting hanging step body, and a mounting groove is formed in the top of the inner cavity of the sitting hanging step body. According to the four-way sitting and hanging step applied to the high-load working condition, starting from the structure, the circular groove is cut in the four-way, the sitting and hanging step body made of the three-petal type high-strength material is inlaid in the circular groove, and the inlaid material is fixed through the locking ring, so that the strength is improved by 80%; by means of the improvement, the strength of an original seat hanging step is improved from 75K to 135K, and the strength is improved by 80%.

Description

Technical Field

[0001] The invention relates to the field of cross-joints used in petroleum drills, and in particular to a cross-joint hanging step used in high-load working conditions. Background Art

[0002] With the growth of global population and economic development, the demand for oil, gas and mineral resources is increasing. However, the reserves of many important oil, gas and mineral resources on the surface or in shallow layers are limited and can no longer meet the long-term needs of mankind. Therefore, it is necessary to find new sources of resources, and the deep earth is a potential treasure trove of important resources.

[0003] As the depth of oil drilling continues to increase, traditional equipment is bound to be replaced. For example, the cross joint, which is the core component of the wellhead device, needs to have a load-bearing step that can meet the suspension needs of the 10,000-meter deep well oil pipeline and also meet the load requirements of the pressure test.

[0004] At present, the hanging steps of traditional cross-pieces are usually designed as an integrated structure with the cross-piece, and the cross-piece body material is generally 75K. This type of design can meet the well depth requirements of about 8,000 meters. However, the increase in suspended weight brought by 10,000-meter deep wells has made this type of design unable to adapt to the latest mining needs. Its load-bearing capacity cannot meet the requirements. It is subject to the requirements of the API6A standard on vertical diameter, so it is impossible to increase the bearing capacity by simply increasing the contact area.

[0005] Therefore, it is necessary to propose a four-way hanging step for high load conditions to solve the above problems. Summary of the invention

[0006] The main purpose of the present invention is to provide a four-way hanging step for use in high-load conditions, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A four-way hanging step used in high-load working conditions comprises a four-way, a hanging step body is installed on the outer wall of the four-way, a locking ring is installed in the inner cavity of the hanging step body, and a positioning block is attached to the outer wall of the locking ring.

[0009] Preferably, a circular groove is provided on the outer wall of the four-way, a second through groove is provided on the bottom of the inner cavity of the sitting and hanging step body, an installation groove is provided on the top of the inner cavity of the sitting and hanging step body, the installation groove and the inner cavity of the second through groove are connected, and cutting lines are provided on the outer wall of the sitting and hanging step body, and there are three cutting lines.

[0010] Preferably, the sizes of the second through groove and the circular groove are matched, and the sitting and hanging step body is installed on the outer wall of the sitting and hanging step body through the second through groove and the circular groove.

[0011] Preferably, a first through groove is opened in the center of the inner cavity of the locking ring, and the locking ring is installed in the circular groove through the first through groove, and the locking ring is located in the inner cavity of the installation groove.

[0012] Preferably, there are three positioning blocks, and the opposite sides of the three positioning blocks are symmetrically fitted on the outer wall of the locking ring, and the top and bottom of the opposite sides of the three positioning blocks are symmetrically installed with elastic bands, and the other side of the elastic band is installed in the inner cavity of the installation groove. The locking ring is welded on the opposite side of the three positioning blocks.

[0013] Preferably, springs are symmetrically mounted on both ends of the positioning block close to one side of the hanging step body, and the other end of the spring is mounted in the inner cavity of the mounting groove.

[0014] Preferably, the method for preparing the sitting and hanging step body comprises the following steps:

[0015] S1: Selection of alloy materials: Si-Fe, Si-Mn, Al-Mn-Fe, Si-Ca-Ba, Ti-Fe, which are melted into molten iron, the phase line temperature of the molten iron is 1515°C, the tapping temperature when pouring the first furnace or changing the tundish is 1680°C-1710°C, the temperature of the molten steel at the blowing station is 1620°C-1640°C, the temperature at the oxygen blowing station is 1595°C-1610°C, the temperature of the tundish is 1535°C-1550°C, the tapping temperature of the continuous casting, the temperature at the argon blowing station, the temperature at the argon blowing station, and the temperature of the tundish are 1660°C-1680°C, 1600°C-1620°C, 1585°C-1600°C, and 1525°C-1540°C respectively;

[0016] S2: Use strong deoxidizers Al-Mn-Fe and Si-Ca-Ba, add them with the steel flow from 1 / 3 of the steel out; add Al-Mn-Fe at 0.8-1.0kg / t, Si-Ca-Ba at 0.6-0.8kg / t, and Ti-Fe at 0.50kg / t. When the alloy material end point C <0.06%, after the composition is adjusted appropriately, feed 10-15m of aluminum wire per furnace, and ensure that the blowing time is >2min;

[0017] S3: Heating: placing the alloy material in a heating furnace, with the uniform heating temperature at 1170-1250°C, the first stage heating temperature at 1210-1290°C, and the second stage heating temperature at 1140-1220°C;

[0018] S4: Dephosphorization: prepare high-pressure water greater than 15MPa, and perform high-pressure water dephosphorization on the alloy material 2-4 times;

[0019] S5: Rolling: The alloy material is rolled at an initial rolling temperature of 1060 - 1150 °C and a final rolling temperature of 800 - 920 °C. After rolling, it is cooled by water cooling to 680 - 750 °C. The steel passing speed during the cooling process is 200 - 620 rpm. After water cooling, it is straightened at a straightening temperature of 500 - 800 °C. After straightening, it is sheared at a shearing temperature of less than 200 °C, thus completing the preparation of the hanging step body.

[0020] Preferably, in the step S1, the conditions of the molten iron entering the factory are: P ≤ 0.080%, S ≤ 0.040%, 0.25% < Si < 0.60%; the conditions of the molten iron entering the converter are: P ≤ 0.150%, S ≤ 0.025%, 0.20% < Si ≤ 0.60%, where carbon is controlled at 0.06% - 0.12%, and P and S are controlled at ≤ 0.025%.

[0021] Compared with the prior art, the present invention provides a four-way hanging step applied to high-load working conditions, having the following beneficial effects:

[0022] 1. For the four-way hanging step applied to high-load working conditions, since the API6A standard has strict standards for the inner diameter and minimum vertical through-diameter of the four-way, to a certain extent, the contact area of the bearing step is fixed, and it is impossible to increase the bearing capacity by increasing the contact area. Therefore, starting from the structure, the present invention cuts out a circular groove inside the four-way, and installs a hanging step body made of three-piece high-strength material inside, and is supplemented with a locking ring to fix the inlaid material, so that the strength is increased by 80%, thus meeting the requirements of a ten-thousand-meter deep well. After such improvement, the strength of the original hanging step is increased from 75K to 135K, and the strength is increased by 80%.

[0023] 2. For the four-way hanging step applied to high-load working conditions, through the set spring, the positioning block can be always elastically pushed inward, so that the positioning block can fit on the outer wall of the locking ring, thus facilitating the connection between the locking ring and the hanging step body. At the same time, it can adapt to locking rings of various sizes for installation. And through the set elastic band, the gap between the positioning block and the hanging step body can be always blocked, so as to avoid the entry of sundries, making the locking ring and the positioning block fit more tightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the front structural schematic diagram of the present invention;

[0025] Figure 2 is the structural schematic diagram of the hanging step body of the present invention;

[0026] Figure 3 is the structural schematic diagram of the cutting line of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the locking ring of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the positioning block of the present invention;

[0029] Figure 6 It is a finite element analysis diagram of a traditional integrated sitting and hanging step;

[0030] Figure 7 It is a finite element analysis diagram of the sitting and hanging step body of the present invention.

[0031] In the figure: 1, four-way; 2, sitting and hanging step body; 3, locking ring; 4, first through groove; 5, mounting groove; 6, second through groove; 7, cutting line; 8, positioning block; 9, elastic band; 10, spring. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] Embodiment 1:

[0034] like Figure 1-Figure 7 As shown, a four-way hanging step for high-load working conditions includes a four-way 1, a hanging step body 2 is installed on the outer wall of the four-way 1, a locking ring 3 is installed in the inner cavity of the hanging step body 2, a positioning block 8 is attached to the outer wall of the locking ring 3, a circular groove is opened on the outer wall of the four-way 1, a second through groove 6 is opened at the bottom of the inner cavity of the hanging step body 2, an installation groove 5 is opened on the top of the inner cavity of the hanging step body 2, the installation groove 5 is communicated with the inner cavity of the second through groove 6, and a cutting line 7 is opened on the outer wall of the hanging step body 2, and the cutting line 7 has three lines, the second The sizes of the through slot 6 and the circular slot are adapted, the hanging step body 2 is installed on the outer wall of the hanging step body 2 through the second through slot 6 and the circular slot, the first through slot 4 is opened in the middle of the inner cavity of the locking ring 3, the locking ring 3 is installed in the circular slot through the first through slot 4, the locking ring 3 is located in the inner cavity of the mounting groove 5, there are three positioning blocks 8, the opposite sides of the three positioning blocks 8 are symmetrically fitted on the outer wall of the locking ring 3, the top and bottom of the opposite sides of the three positioning blocks 8 are symmetrically installed with elastic bands 9, and the other side of the elastic band 9 is installed in the inner cavity of the mounting groove 5. The locking ring 3 is welded on the opposite side of the three positioning blocks 8, and the two ends of the positioning blocks 8 close to the hanging step body 2 are symmetrically installed with springs 10, and the other end of the spring 10 is installed in the inner cavity of the mounting groove 5.

[0035] A four-way hanging step for use in high-load working conditions, wherein the preparation method of the hanging step body 2 comprises the following steps:

[0036] S1: Selection of alloy materials: Si-Fe, Si-Mn, AL-Mn-Fe, Si-Ca-Ba, Ti-Fe. Melt them into molten iron. The phase line temperature of the molten iron is 1515°C. When starting the first furnace or changing the tundish, the tapping temperature is 1680°C - 1710°C. The temperature of the molten steel when arriving at the blowing station is 1620°C - 1640°C. The temperature when leaving the oxygen blowing station is 1595°C - 1610°C. The tundish temperature is 1535°C - 1550°C. For continuous casting, the tapping temperature, the temperature when arriving at the argon blowing station, the temperature when leaving the argon blowing station, and the tundish temperature are 1660°C - 1680°C, 1600°C - 1620°C, 1585°C - 1600°C, and 1525°C - 1540°C respectively. The conditions of the incoming molten iron are: P ≤ 0.080%, S ≤ 0.040%, 0.25% < Si ≤ 0.60%; the conditions of the molten iron entering the converter are: P ≤ 0.150%, S ≤ 0.025%, 0.20% < Si ≤ 0.60%, where carbon is controlled at 0.06% - 0.12%, and P and S are controlled at ≤ 0.025%;

[0037] S2: Use strong deoxidizers Al-Mn-Fe and Si-Ca-Ba, and add them along with the steel flow starting from 1 / 3 of the tapping. Add Al-Mn-Fe at 0.8 - 1.0 kg / t, Si-Ca-Ba at 0.6 - 0.8 kg / t, and Ti-Fe at 0.50 kg / t. When the terminal C of the alloy material < 0.06%, after the composition is adjusted properly, feed 10 - 15 m of aluminum wire per furnace and ensure that the blowing time > 2 min;

[0038] S3: Heating: Place the alloy materials in a heating furnace. The soaking temperature is 1170 - 1250°C, the first-stage heating temperature is 1210 - 1290°C, and the second-stage heating temperature is 1140 - 1220°C;

[0039] S4: Dephosphorization: Prepare high-pressure water greater than 15 MPa and conduct high-pressure water dephosphorization on the alloy materials 2 - 4 times;

[0040] S5: Rolling: Conduct rolling treatment on the alloy materials at the starting rolling temperature of 1060 - 1150°C and the finishing rolling temperature of 800 - 920°C. After rolling, cool it with water cooling to 680 - 750°C. The steel passing speed during the cooling process is 200 - 620 rpm. After water cooling, straighten it. The straightening temperature is 500 - 800°C. After straightening, shear it. The shearing temperature is less than 200°C. In this way, the preparation of the hanging step body 2 is completed.

[0041] Since the API6A standard has strict standards for the inner diameter and minimum vertical diameter of the four-way, the contact area of ​​the load-bearing step is fixed to a certain extent, and it is impossible to increase the load-bearing effect by increasing the contact area. Therefore, the present invention starts from the structure, by cutting a circular groove inside the four-way 1, and inlaying a three-petal high-strength material sitting step body 2 inside, and supplemented by a locking ring 3 to fix the inlaid material, so that the strength is increased by 80%, thereby meeting the needs of 10,000-meter deep wells. After such improvements, the strength of the original sitting step is increased from 75K to 135K, and the strength is increased by 80%. Through the provided spring 10, the positioning block 8 can be bounced inward at any time, so that the positioning block 8 can fit on the outer wall of the locking ring 3, so as to facilitate the connection between the locking ring 3 and the sitting step body 2, and can be adapted to various sizes of locking rings 3 for installation, and through the provided elastic band 9, the gap between the positioning block 8 and the sitting step body 2 can be covered at any time, so as to avoid the entry of debris, so that the locking ring 3 and the positioning block 8 can fit more closely.

[0042] It should be noted that the present invention is a four-way sitting and hanging step used in high-load working conditions. When in use, a circular groove is opened inside the four-way 1, the circular groove is cleaned to ensure that it is clean and without damage, grease is applied, and the sitting and hanging step body 2 is cleaned to ensure that it is clean and without damage. The three-petal sitting and hanging step body 2 is installed to the circular groove of the sitting and hanging step body 2, and the locking ring 3 is tightened and installed on the sitting and hanging step body 2. At this time, the positioning block 8 in the inner cavity of the sitting and hanging step body 2 will be attached to the outer wall of the locking ring 3 through the spring 10, and the elastic band 9 will move with the movement of the positioning block 8. Finally, the sitting and hanging step body 2 is fixed to the four-way 1 by spot welding, and the residue after welding is polished to prevent subsequent damage to the wellhead equipment.

[0043] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A four-way hanging step for use in high-load working conditions, comprising a four-way (1), characterized in that: The outer wall of the four-way (1) is installed with a hanging step body (2), the inner cavity of the hanging step body (2) is installed with a locking ring (3), and the outer wall of the locking ring (3) is fitted with a positioning block (8).

2. A four-way hanging step for high load conditions according to claim 1, characterized in that: The outer wall of the four-way (1) is provided with a circular groove, the bottom of the inner cavity of the sitting and hanging step body (2) is provided with a second through groove (6), the top of the inner cavity of the sitting and hanging step body (2) is provided with a mounting groove (5), the mounting groove (5) and the inner cavity of the second through groove (6) are communicated, and the outer wall of the sitting and hanging step body (2) is provided with cutting lines (7), and the cutting lines (7) are three in number.

3. A four-way hanging step for high load conditions according to claim 2, characterized in that: The sizes of the second through groove (6) and the circular groove are matched, and the sitting and hanging step body (2) is installed on the outer wall of the sitting and hanging step body (2) through the second through groove (6) and the circular groove.

4. A four-way hanging step for high load conditions according to claim 1, characterized in that: A first through groove (4) is provided in the middle of the inner cavity of the locking ring (3), and the locking ring (3) is installed in the circular groove through the first through groove (4). The locking ring (3) is located in the inner cavity of the installation groove (5).

5. The four-way hanging step for high load conditions according to claim 1, characterized in that: There are three positioning blocks (8), and the opposite sides of the three positioning blocks (8) are symmetrically fitted on the outer wall of the locking ring (3). Elastic bands (9) are symmetrically installed on the top and bottom of the opposite sides of the three positioning blocks (8), and the other side of the elastic band (9) is installed in the inner cavity of the installation groove (5). The locking ring (3) is welded to the opposite sides of the three positioning blocks (8).

6. A four-way hanging step for high load conditions according to claim 5, characterized in that: Springs (10) are symmetrically mounted on both ends of the positioning block (8) close to the side of the hanging step body (2), and the other end of the spring (10) is mounted in the inner cavity of the mounting groove (5).

7. The four-way hanging step for high load conditions according to claim 1, characterized in that: The preparation method of the sitting and hanging step body (2) comprises the following steps: S1: Selection of alloy materials: Si-Fe, Si-Mn, Al-Mn-Fe, Si-Ca-Ba, Ti-Fe, which are melted into molten iron, the phase line temperature of the molten iron is 1515°C, the tapping temperature when pouring the first furnace or changing the tundish is 1680°C-1710°C, the temperature of the molten steel at the blowing station is 1620°C-1640°C, the temperature at the oxygen blowing station is 1595°C-1610°C, the temperature of the tundish is 1535°C-1550°C, the tapping temperature of the continuous casting, the temperature at the argon blowing station, the temperature at the argon blowing station, and the temperature of the tundish are 1660°C-1680°C, 1600°C-1620°C, 1585°C-1600°C, and 1525°C-1540°C respectively; S2: Use strong deoxidizers Al-Mn-Fe and Si-Ca-Ba, add them with the steel flow from 1 / 3 of the steel out; add Al-Mn-Fe at 0.8-1.0kg / t, Si-Ca-Ba at 0.6-0.8kg / t, and Ti-Fe at 0.50kg / t. When the alloy material end point C <0.06%, after the composition is adjusted appropriately, feed 10-15m of aluminum wire per furnace, and ensure that the blowing time is >2min; S3: Heating: placing the alloy material in a heating furnace, with the uniform heating temperature at 1170-1250°C, the first stage heating temperature at 1210-1290°C, and the second stage heating temperature at 1140-1220°C; S4: Phosphorus removal: Prepare high-pressure water greater than 15 MPa and conduct high-pressure water phosphorus removal on the alloy material 2 - 4 times. S5: Rolling: Roll the alloy material at an initial rolling temperature of 1060 - 1150 °C and a final rolling temperature of 800 - 920 °C. After rolling, cool it with water cooling to 680 - 750 °C. The steel passing speed during the cooling process is 200 - 620 rpm. After water cooling, straighten it. The straightening temperature is 500 - 800 °C. After straightening, shear it. The shearing temperature is less than 200 °C, thus completing the preparation of the hanging step body (2).

8. The four-way hanging step for high load conditions according to claim 7, characterized in that: In the said step S1, the conditions of the molten iron entering the factory are: P ≤ 0.080%, S ≤ 0.040%, 0.25% < Si ≤ 0.60%; the conditions of the molten iron entering the converter are: P ≤ 0.150%, S ≤ 0.025%, 0.20% < Si ≤ 0.60%, where carbon is controlled at 0.06% - 0.12%, and P and S are controlled at ≤ 0.025%.

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