CN109779538B - Petroleum downhole operation device - Google Patents

Petroleum downhole operation device Download PDF

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Publication number
CN109779538B
CN109779538B CN201910113816.8A CN201910113816A CN109779538B CN 109779538 B CN109779538 B CN 109779538B CN 201910113816 A CN201910113816 A CN 201910113816A CN 109779538 B CN109779538 B CN 109779538B
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China
Prior art keywords
sealing
ring
joint
sealing piston
sand
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CN201910113816.8A
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CN109779538A (en
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不公告发明人
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DONGYING YUANJIE PETROLEUM MACHINERY Co.,Ltd.
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Dongying Yuanjie Petroleum Machinery Co ltd
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Priority to CN201910113816.8A priority Critical patent/CN109779538B/en
Priority to CN201710834770.XA priority patent/CN107558933B/en
Publication of CN109779538A publication Critical patent/CN109779538A/en
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Publication of CN109779538B publication Critical patent/CN109779538B/en
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Abstract

The invention relates to a petroleum underground operation device. The technical scheme is as follows: the sand loosening device comprises an upper connector and a lower connector, wherein the lower part of the upper connector is connected with the lower connector, a sealing steel sleeve is sleeved on the outer side of the upper connector, a shear ring is arranged between the sealing steel sleeve and the upper part of the upper connector, a safety shear pin is arranged on the upper part of the shear ring, a sealing piston is arranged between the sealing steel sleeve and the lower part of the upper connector, the sealing piston is connected with the lower part of the upper connector through a left-hand thread, an impact cavity is arranged between the shear ring and the sealing piston, and a sand loosening hole is formed in the lower part of the sealing steel sleeve. The invention has the beneficial effects that: the invention can solve the problem of sand blocking, ensure that the pipe column can be safely lifted, prevent the overhaul of an oil well, directly pull out the sand control pipe under various conditions, solve the problem that the sand control pipe is mostly taken out in sections at present, and has simple operation, time saving and labor saving.

Description

Petroleum downhole operation device
Technical Field
The invention relates to a petroleum underground operation device.
Background
In oil and gas development operations, safety joints are special tools used in downhole operations and production strings. The safety joint has the function that when the underground pipe string has an accident, the pipe string which is blocked can be separated from the safety joint, so that good conditions are created for further handling the accident. The safety joint is generally used in construction wells with complicated pipe column structures and wells with special operation requirements. The safety joint commonly used in the vertical well at present mainly comprises a reverse buckling type safety joint and a shear pin type safety joint. The upper joint and the lower joint of the reverse-buckling safety joint are connected through left-hand threads, when the pipe column is clamped underground, the pipe column needs to be rotated clockwise, if the well condition is complex, if sand is buried, torque transmission is not in place, the safety joint is difficult to open, the success rate is low, and the reliability is poor; the conventional shear pin type safety joint is connected with the upper joint and the lower joint only by shear pins, and is easily broken and separated in the middle of well completion operation due to the influence of operation and well conditions, so that operation accidents are caused.
In addition, in the process of oil downhole operation, the condition of sand burying can occur between the downhole pipe column and the casing pipe, and due to the sand burying, the sand prevention pipe is easy to clamp and cannot be taken out, so that the problem of oil well overhaul occurs, the oil well overhaul can cause large operation workload, and the economic loss is large. In the prior art, a pipe column is lifted by using a shear pin type safety joint, but due to the fact that the height of sand burying is too high, shear pins on the safety joint are buried sometimes, the shear pins cannot be sheared, and the pipe column cannot be taken out. In addition, the safety joint generally adopts positive and negative joint, under the serious condition of sand burying, rotates the difficulty, does not play the safety action, even can take out, takes out through the segmentation mostly, and the operation is complicated, wastes time and energy. In summary, in the prior art, the principle of loosening the sand burying by repeatedly impacting up and down is not adopted.
Disclosure of Invention
The invention aims to solve the problems of sand blocking, safe extraction of a pipe column, prevention of overhaul of an oil well, direct extraction of a sand control pipe under various conditions, and capability of solving the problem that the sand control pipe is mostly taken out in sections at present, and the loose sand type oil underground safety joint is simple to operate, time-saving and labor-saving.
The invention provides a loose sand type petroleum underground safety joint, which adopts the technical scheme that: the joint comprises an upper joint (1) and a lower joint (2), wherein the lower part of the upper joint (1) is connected with the lower joint (2), a sealing steel sleeve (5) is sleeved outside the upper joint (1), the sealing steel sleeve (5) is fixedly connected with the lower joint (2), a shear ring (4) is arranged between the top of the sealing steel sleeve (5) and the upper joint (1), a safety shear pin (3) is arranged at the upper part of the shear ring, and the safety shear pin (3) is connected with a groove in the outer wall of the upper joint (1); be equipped with between the lower part of sealed steel bushing (5) and top connection (1) sealing piston (8), sealing piston (8) are connected through left-hand thread (7) with the lower part of top connection (1), be striking chamber (6) between shear ring (4) and sealing piston (8), loose sand hole (9) have been seted up in the lower part of sealed steel bushing (5), and the inboard of loose sand hole (9) is realized closing through sealing piston (8), safe shear pin (3) are cut off the back, top connection (1) drive sealing piston (8) rebound, realize opening of loose sand hole (9).
Preferably, the shear ring (4) consists of an upper ring and a lower ring, the outer diameter of the upper ring is the same as that of the sealing steel sleeve (5), and the safety shear pin (3) is arranged on the inner side of the upper ring; the outer diameter of the lower ring is smaller than the inner diameter of the sealing steel sleeve (5), and the inner diameter of the lower ring is larger than the outer diameter of the lower part of the upper joint (1), so that the lower ring is arranged in an annular space between the sealing steel sleeve (5) and the upper joint (1).
Preferably, a first minor arc (10) and a first bayonet (12) are arranged at the bottom of the shear ring (4), the first bayonet (12) is a major arc with the milling depth of 3-5 mm at the bottom of the shear ring (4) to form a raised first minor arc (10), a second minor arc (11) and a second bayonet (13) are arranged at the top of the sealing piston (8), and the first bayonet (12) is a major arc with the milling depth of 3-5 mm at the top of the sealing piston (8) to form a raised second minor arc (11).
Preferably, when the sand control pipe moves upwards through a wellhead power device, the sand control pipe drives the upper connector (1) to move upwards, the upper connector (1) drives the sealing piston (8) to move upwards in the impact cavity (6), the top of the sealing piston (8) moves to the bottom of the shear ring (4), a first minor arc (10) on the shear ring (4) is clamped in a second bayonet (13) on the sealing piston (8), a second minor arc (11) on the sealing piston (8) is clamped in a first bayonet (12) on the shear ring (4), and when the sand control pipe is driven to rotate forwards through the wellhead power device, the upper connector (1) and the sealing piston (8) can be driven to be separated in a tripping mode.
Preferably, the sealing piston (8) comprises a cylindrical connecting main body (8.1) and a sealing stress ring (8.2), the inner wall of the connecting main body (8.1) is provided with a left-hand thread (7), and the sealing piston is connected with the outer wall of the upper joint through the left-hand thread (7); the sealing stress ring (8.2) is of an inward-concave cylindrical structure, the bottom of the cylindrical structure is a balanced controlled area (8.3), the stress of the balanced controlled area (8.3) is smaller than the shearing force of the shear pin, when a wellhead needs to be pressurized, when the pressure exceeds 105 MPa, the sealing piston moves upwards, and pressure is relieved through the sand loosening hole (9).
The invention has the beneficial effects that: the invention can solve the problem of sand burying of the pipe column, ensure that the pipe column can be safely lifted, prevent the overhaul of an oil well, directly pull out the sand control pipe under various conditions, solve the problem that the sand control pipe is mostly taken out in sections at present and have various operation modes;
according to the invention, the upper joint can drive the sealing piston to move up and down in the impact cavity, when the sealing piston moves up, the top of the sealing piston impacts the bottom of the shear ring, when the sealing piston moves down, the bottom of the sealing piston impacts the upper part of the lower joint to form continuous up-down impact, the sand burying part of the annular space between the sleeve and the sand control pipe is loosened, sand enters the sealing steel sleeve through the sand control hole to realize the purpose of sand control, and then the sand control pipe is integrally pulled out of a well mouth;
in addition, when the sand control pipe cannot be lifted out of the wellhead due to vertical impact, the sealing piston is separated from the lower part of the upper joint and is divided into two sections through the special structural matching of the sealing piston and the shear ring, so that the upper joint is pulled out of the wellhead, the fishing device is lowered again, the rest joints and the sealing steel sleeve are fished out of the wellhead, and the grading fishing is realized, so that the function of a safety joint is effectively realized;
compared with the prior art, the impact cavity is added, the problem of sand burying is solved by realizing vertical impact, and the structure of the sealing piston and the shear ring is improved, so that the sealing piston and the shear ring can be effectively separated, and a pipe column is separated from a safety joint when meeting a clamp, so that a good condition is created for further processing an accident.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a sealing piston;
FIG. 3 is a schematic view of the bottom of the shear ring;
FIG. 4 is a schematic view of the structure of the top of the sealing piston;
in the upper diagram: the device comprises an upper joint 1, a lower joint 2, a safety shear pin 3, a shear ring 4, a sealing steel sleeve 5, an impact cavity 6, a left-hand thread 7, a sealing piston 8, a sand loosening hole 9, a first minor arc 10, a second minor arc 11, a first bayonet 12, a second bayonet 13, a connecting main body 8.1, a sealing stress ring 8.2 and a balance controlled area 8.3.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The invention provides a loose sand type petroleum underground safety joint, which adopts the technical scheme that: the joint comprises an upper joint (1) and a lower joint (2), wherein the lower part of the upper joint (1) is connected with the lower joint (2), a sealing steel sleeve (5) is sleeved outside the upper joint (1), the sealing steel sleeve (5) is fixedly connected with the lower joint (2), a shear ring (4) is arranged between the top of the sealing steel sleeve (5) and the upper joint (1), a safety shear pin (3) is arranged at the upper part of the shear ring, and the safety shear pin (3) is connected with a groove in the outer wall of the upper joint (1); be equipped with between the lower part of sealed steel bushing (5) and top connection (1) sealing piston (8), sealing piston (8) are connected through left-hand thread (7) with the lower part of top connection (1), be striking chamber (6) between shear ring (4) and sealing piston (8), loose sand hole (9) have been seted up in the lower part of sealed steel bushing (5), and the inboard of loose sand hole (9) is realized closing through sealing piston (8), safe shear pin (3) are cut off the back, top connection (1) drive sealing piston (8) rebound, realize opening of loose sand hole (9).
Referring to the attached figure 1, the shear ring (4) of the invention consists of an upper ring and a lower ring, the outer diameter of the upper ring is the same as that of a sealing steel sleeve (5), and the safety shear pin (3) is arranged on the inner side of the upper ring; the outer diameter of the lower ring is smaller than the inner diameter of the sealing steel sleeve (5), and the inner diameter of the lower ring is larger than the outer diameter of the lower part of the upper joint (1), so that the lower ring is arranged in an annular space between the sealing steel sleeve (5) and the upper joint (1).
Referring to the attached drawings 3 and 4, the bottom of a shear ring (4) is provided with a first minor arc (10) and a first bayonet (12), the first bayonet (12) is a major arc with the milling depth of 3-5 mm at the bottom of the shear ring (4) to form a raised first minor arc (10), the top of a sealing piston (8) is provided with a second minor arc (11) and a second bayonet (13), and the second bayonet (13) is a major arc with the milling depth of 3-5 mm at the top of the sealing piston (8) to form a raised second minor arc (11).
When the sand control pipe is moved upwards through a wellhead power device, the sand control pipe drives the upper connector (1) to move upwards, the upper connector (1) drives the sealing piston (8) to move upwards in the impact cavity (6), the top of the sealing piston (8) moves to the bottom of the shear ring (4), so that the first minor arc (10) on the shear ring (4) is clamped in the second bayonet (13) on the sealing piston (8), the second minor arc (11) on the sealing piston (8) is clamped in the first bayonet (12) on the shear ring (4), and when the sand control pipe is driven to rotate forwards through the wellhead power device, the upper connector (1) and the sealing piston (8) can be driven to be unscrewed and separated.
Referring to the attached figure 2, the sealing piston (8) of the invention comprises a cylindrical connecting main body (8.1) and a sealing stress ring (8.2), wherein the inner wall of the connecting main body (8.1) is provided with a left-hand thread (7) and is connected with the outer wall of an upper joint through the left-hand thread (7); the sealing stress ring (8.2) is of an inward-concave cylindrical structure, the bottom of the cylindrical structure is a balanced controlled area (8.3), the stress of the balanced controlled area (8.3) is smaller than the shearing force of the shear pin, when a wellhead needs to be pressurized, when the pressure exceeds 105 MPa, the sealing piston moves upwards, and pressure is relieved through the sand loosening hole (9).
The invention provides a using method of a loose sand type petroleum underground safety joint, which comprises the following steps:
firstly, an upper joint (1) is connected with a sand control pipe, a lower joint (2) is connected with the sand control pipe, and the sand control pipe is lowered to the underground along a casing pipe through a wellhead power device;
secondly, when the sand control pipe runs into sand and buries, need be drawn by well head power device, divide into following four kinds of circumstances and implement the operation:
when the sand burying depth is small, the sand control pipe can be pulled out of a wellhead as a whole by directly pulling upwards through a wellhead power device;
when the sand control pipe cannot be directly pulled out by the wellhead power device, the pulling force applied by the wellhead power device cuts off the safety nail through the shearing ring, the sand control pipe drives the upper joint to move upwards, the upper joint simultaneously drives the sealing piston (8) to move upwards, and the sand loosening hole (9) is opened, so that sand in an annular space between the sleeve and the sand control pipe is buried and loosened, and the sand control pipe is integrally pulled out of the wellhead;
thirdly, when the sand control pipe cannot be pulled out after the safety nail is sheared off, the sand control pipe is moved up and down through a wellhead power device, so that the sand control pipe vibrates up and down, the sand control pipe drives the upper connector (1) to move up and down, the upper connector (1) drives the sealing piston (8) to move up and down in the impact cavity (6) as the sealing piston (8) is connected with the lower part of the upper connector (1) through the left-hand thread (7), when the sealing piston moves up, the top of the sealing piston (8) impacts the bottom of the shear ring (4), when the sealing piston moves down, the bottom of the sealing piston (8) impacts the upper part of the lower connector to form continuous up and down impact, sand in an annular space between the sleeve and the sand control pipe can be buried and loosened, the sand enters the inside of the sealing steel sleeve through the sand loosening hole (9), the purpose of sand loosening is achieved, and the sand control pipe is pulled out of a wellhead as;
fourthly, when the sand control pipe cannot be lifted out of the wellhead in the third operation step, the sand control pipe is moved upwards through a wellhead power device, the sand control pipe drives the upper connector (1) to move upwards, the upper connector (1) drives the sealing piston (8) to move upwards in the impact cavity (6), the top of the sealing piston (8) impacts the bottom of the shear ring (4), so that the first minor arc (10) on the shear ring (4) is clamped in the second bayonet (13) on the sealing piston (8), the second minor arc (11) on the sealing piston (8) is clamped in the first bayonet (12) on the shear ring (4), the first minor arc (10) on the shear ring (4) is combined with the second minor arc (11) on the sealing piston (8), and the lower part of the upper connector (1) is connected through reverse buckling, and at the time, the sand control pipe can be rotated open between the sealing piston (8) and the lower part of the upper connector (1), and the upper joint is pulled out of the wellhead, the fishing device is lowered again, and the remaining joint and the sealing steel sleeve are fished out of the wellhead to realize graded fishing.
The specific four cases are further illustrated:
in the first case: the sand control pipe is connected to top connection 1, and the sand control pipe is connected to bottom connection 2, and the sand control pipe is being drawn by well head power device, buries the degree of depth when sand less, directly upwards draws through well head power device, can wholly pull out the well head with the sand control pipe.
In the second case: the sand control pipe is connected to top connection 1, and the sand control pipe is connected to bottom connection 2, and the sand control pipe is drawing by well head power device, and when the sand control pipe can't directly be drawn out by well head power device, the pulling force is cut safety nail through shear ring, and the sand control pipe drives the top connection rebound, and the annular space between sleeve pipe and the sand control pipe buries partly not hard up, and then pulls out the well head with the sand control pipe is whole.
In the third case: the upper joint 1 is connected with a sand control pipe, the lower joint 2 is connected with the sand control pipe, the sand control pipe is pulled by a well mouth power device, when the sand control pipe cannot be directly pulled out by the well mouth power device, the pulling force cuts off a safety nail through a shear ring, when the sand control pipe cannot be pulled out after the safety nail is cut off, the sand control pipe is moved up and down through the well mouth power device, the vertical vibration of the sand control pipe is realized, the sand control pipe drives the upper joint 1 to move up and down, because the sealing piston 8 is connected with the lower part of the upper joint 1 through a left-hand thread 7, the upper joint 1 drives the sealing piston 8 to move downwards in the impact cavity 6, when moving upwards, the top of the sealing piston 8 impacts the bottom of the shear ring 4, when moving downwards, the bottom of the sealing piston 8 impacts the upper part of the lower joint to form continuous vertical impact, the sand embedding part of the annulus between the sleeve and the sand control pipe is loosened, and sand enters the sealing steel sleeve through, the purpose of sand loosening is realized, and then the sand control pipe is integrally pulled out of the wellhead.
In a fourth case: the upper joint 1 is connected with a sand control pipe, the lower joint 2 is connected with the sand control pipe, the sand control pipe is pulled by a well mouth power device, when the sand control pipe cannot be directly pulled out by the well mouth power device, the pulling force cuts the safety nail through a shear ring, when the sand control pipe cannot be pulled out after the safety nail is cut, the sand control pipe is moved up and down through the well mouth power device, the vertical vibration of the sand control pipe is realized, the sand control pipe drives the upper joint 1 to move up and down, because the sealing piston 8 is connected with the lower part of the upper joint 1 through the left-hand thread 7, the upper joint 1 drives the sealing piston 8 to move down in the impact cavity 6, when moving up, the top of the sealing piston 8 impacts the bottom of the shear ring 4, when moving down, the bottom of the sealing piston 8 impacts the upper part of the lower joint to form continuous vertical impact, when the well mouth power device moves up and down, the sand control pipe still cannot be pulled out, the sand control pipe drives the upper connector 1 to move upwards, the upper connector 1 drives the sealing piston 8 to move upwards in the impact cavity 6, the top of the sealing piston 8 moves to the bottom of the shear ring 4, a first minor arc 10 on the shear ring 4 is clamped in a second bayonet 13 on the sealing piston 8, a second minor arc 11 on the sealing piston 8 is clamped in a first bayonet 12 on the shear ring 4, the first minor arc 10 on the shear ring 4 is combined with the second minor arc 11 on the sealing piston 8, and the sealing piston 8 is connected with the lower part of the upper connector 1 through reverse buckling, the sand control pipe rotates forwards, the sealing piston 8 is separated from the lower part of the upper connector 1 and is divided into two sections, so that the upper connector is pulled out of a wellhead, the fishing device is placed again, and the remaining connectors and sealing steel sleeves are fished out of the wellhead to realize graded fishing.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.

Claims (2)

1. The utility model provides an oil borehole operation device, includes top connection (1) and lower clutch (2), and the sub-unit connection of top connection (1) has lower clutch (2), characterized by: a sealing steel sleeve (5) is sleeved on the outer side of the upper joint (1), the sealing steel sleeve (5) is fixedly connected with the lower joint (2), a shear ring (4) is arranged between the top of the sealing steel sleeve (5) and the upper joint (1), a safety shear pin (3) is arranged at the upper part of the shear ring, and the safety shear pin (3) is connected with a groove in the outer wall of the upper joint (1); a sealing piston (8) is arranged between the sealing steel sleeve (5) and the lower part of the upper joint (1), the sealing piston (8) is connected with the lower part of the upper joint (1) through a left-hand thread (7), an impact cavity (6) is arranged between the shear ring (4) and the sealing piston (8), a sand loosening hole (9) is formed in the lower part of the sealing steel sleeve (5), the inner side of the sand loosening hole (9) is closed through the sealing piston (8), and after the safety shear pin (3) is sheared, the upper joint (1) drives the sealing piston (8) to move upwards to open the sand loosening hole (9);
the shear ring (4) consists of an upper ring and a lower ring, the outer diameter of the upper ring is the same as that of the sealing steel sleeve (5), and the safety shear pin (3) is arranged on the inner side of the upper ring; the outer diameter of the lower ring is smaller than the inner diameter of the sealing steel sleeve (5), and the inner diameter of the lower ring is larger than the outer diameter of the lower part of the upper joint (1), so that the lower ring is arranged in an annular space between the sealing steel sleeve (5) and the upper joint (1);
a first minor arc (10) and a first bayonet (12) are arranged at the bottom of the shear ring (4), the first bayonet (12) is a major arc with the milling depth of 3-5 mm at the bottom of the shear ring (4) to form a raised first minor arc (10), a second minor arc (11) and a second bayonet (13) are arranged at the top of the sealing piston (8), and the second bayonet (13) is a major arc with the milling depth of 3-5 mm at the top of the sealing piston (8) to form a raised second minor arc (11);
when the sand control pipe is moved upwards through a wellhead power device, the sand control pipe drives the upper connector (1) to move upwards, the upper connector (1) drives the sealing piston (8) to move upwards in the impact cavity (6), the top of the sealing piston (8) moves to the bottom of the shear ring (4), so that the first minor arc (10) on the shear ring (4) is clamped in the second bayonet (13) on the sealing piston (8), the second minor arc (11) on the sealing piston (8) is clamped in the first bayonet (12) on the shear ring (4), and when the sand control pipe is driven to rotate forwards through the wellhead power device, the upper connector (1) and the sealing piston (8) can be driven to be unscrewed and separated.
2. An oil downhole operation device according to claim 1, wherein: the sealing piston (8) comprises a cylindrical connecting main body (8.1) and a sealing stress ring (8.2), the inner wall of the connecting main body (8.1) is provided with a left-hand thread (7), and the sealing piston is connected with the outer wall of the upper joint through the left-hand thread (7); the sealing stress ring (8.2) is of an inward-concave cylindrical structure, the bottom of the cylindrical structure is a balanced controlled area (8.3), the stress of the balanced controlled area (8.3) is smaller than the shearing force of the shear pin, when a wellhead needs to be pressurized, when the pressure exceeds 105 MPa, the sealing piston moves upwards, and pressure is relieved through the sand loosening hole (9).
CN201910113816.8A 2017-09-15 2017-09-15 Petroleum downhole operation device Active CN109779538B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201910113816.8A CN109779538B (en) 2017-09-15 2017-09-15 Petroleum downhole operation device
CN201710834770.XA CN107558933B (en) 2017-09-15 2017-09-15 Safety joint under a kind of fluffing of moulding sand formula oil well

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910113816.8A CN109779538B (en) 2017-09-15 2017-09-15 Petroleum downhole operation device

Related Parent Applications (1)

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CN109779538A CN109779538A (en) 2019-05-21
CN109779538B true CN109779538B (en) 2020-06-16

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CN201910113817.2A Pending CN109854186A (en) 2017-09-15 2017-09-15 Safety joint under a kind of fluffing of moulding sand formula oil well
CN201910113816.8A Active CN109779538B (en) 2017-09-15 2017-09-15 Petroleum downhole operation device

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CN109162651B (en) * 2018-09-21 2020-06-05 中国石油集团渤海钻探工程有限公司 Hydraulic safety joint

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CN107558933B (en) 2019-06-21
CN109854186A (en) 2019-06-07
CN109779538A (en) 2019-05-21
CN107558933A (en) 2018-01-09

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