CN211058737U - Oil well pipe column coarse thread safety joint - Google Patents
Oil well pipe column coarse thread safety joint Download PDFInfo
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- CN211058737U CN211058737U CN201922292907.0U CN201922292907U CN211058737U CN 211058737 U CN211058737 U CN 211058737U CN 201922292907 U CN201922292907 U CN 201922292907U CN 211058737 U CN211058737 U CN 211058737U
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Abstract
The utility model discloses a crude thread safety joint of an oil well pipe column, which comprises an upper joint and a lower joint; the upper part of the upper joint is a female thread of a conical thread, the lower part of the upper joint is a male thread of the conical thread, the female thread of the upper joint is a triangular thread, and the male thread is a trapezoidal thread; the upper part of the lower joint is a female thread of a conical thread, the lower part of the lower joint is a male thread of the conical thread, the female thread of the upper joint is a trapezoidal thread, and the male thread is a triangular thread; the upper joint and the lower joint are connected through respective trapezoidal threads, a pin hole used for installing a soluble pin is formed in the upper side of the trapezoidal thread connection position, the soluble pin is tightly installed in the pin hole, a sealing groove is formed in the lower side of the trapezoidal thread connection position of the upper joint and the lower joint, a sealing ring is arranged in the sealing groove, and a gap between the upper joint and the lower joint is sealed through the sealing ring. The utility model discloses a cooperation of thick screw thread and soluble pin has reduced the safety joint and has broken away from required turning force, more is favorable to salvaging of tubular column.
Description
Technical Field
The utility model relates to an oil gas field development technical field specifically is an oil well tubular column coarse thread safety joint.
Background
The safety joint is a common downhole tool for downhole operation and oil testing completion of oil and gas wells, is generally arranged at the easy-to-clamp part of an operation pipe column or a completion pipe column, and once the pipe column is clamped or buried by sand and cannot be smoothly lifted out of the pipe column, the pipe column is disconnected from the safety joint by lifting the pipe column or positively rotating the pipe column, and after the upper pipe column is lifted out, a special tool is put in to salvage the lower pipe column. At present, the common safety joints for field application mainly comprise a shear type safety joint and a left-hand thread type safety joint.
The left-hand thread type safety joint adopts an upper joint and a lower joint, the upper joint and the lower joint are in threaded connection and are fixed through pins, and the thread direction is opposite to that of an oil pipe on a pipe column and other tools. When the pipe column is stuck by sand or buried by sand in the construction process, the pipe column rotates forwards from the wellhead until the pin is sheared off, and the pipe column continues to rotate to release, so that the upper joint and the lower joint are separated. The limitation of current back-buckling formula safety joint lies in: the upper joint and the lower joint are connected too tightly, the rotating pipe column needs large torque force, and when the pipe column is seriously clamped or buried by sand, the pipe column can be immovable.
SUMMERY OF THE UTILITY MODEL
In order to solve the too big problem of conventional safety joint turning force, the utility model provides an oil well tubular column coarse thread safety joint through the cooperation of coarse thread and soluble pin, has reduced safety joint and has broken away from required turning force, more is favorable to salvaging of tubular column.
The technical scheme of the utility model as follows:
a crude thread safety joint of an oil well pipe column comprises an upper joint and a lower joint; the upper part of the upper joint is a female thread of a conical thread, the lower part of the upper joint is a male thread of the conical thread, the female thread of the upper joint is a triangular thread, and the male thread is a trapezoidal thread; the upper part of the lower joint is a female thread of a conical thread, the lower part of the lower joint is a male thread of the conical thread, the female thread of the upper joint is a trapezoidal thread, and the male thread is a triangular thread; the upper joint and the lower joint are connected through respective trapezoidal threads, a pin hole used for installing a soluble pin is formed in the upper side of the trapezoidal thread connection position, the soluble pin is tightly installed in the pin hole, a sealing groove is formed in the lower side of the trapezoidal thread connection position of the upper joint and the lower joint, a sealing ring is arranged in the sealing groove, and a gap between the upper joint and the lower joint is sealed through the sealing ring.
Furthermore, the number of turns of the thread between the upper joint and the lower joint is 2-5 by adopting a trapezoidal coarse thread.
Further, the soluble pins are fabricated from a material that is soluble in chemical solutions.
Furthermore, the soluble pin is composed of two sections of cylinders with different diameters, namely a large section and a small section, the middle part of the large section is provided with a pin cover surface, and the bottom of the small section is provided with a pin snap ring; and a groove for accommodating the gear is arranged on the side surface of the bottom of the pin hole of the upper joint contacted with the pin snap ring.
The utility model discloses an useful part lies in:
(1) the sealing ring and the coarse thread buckle are matched for use, the sealing ring has a sealing effect, can bear certain pressure, prevents liquid from seeping from the safety joint, and ensures that the pressure of liquid construction can be ensured, thereby ensuring that fracturing construction or ball throwing and pressing operation is smooth.
(2) Adopt soluble pin and thick thread button cooperation to use, have dual fixed connection effect, provide higher engaging force, guarantee that the safety joint is difficult to appear the phenomenon that the safety joint breaks in advance and takes off at the lower tubular column operation in-process. After the soluble pin is dissolved, the safety joint can be disconnected only by a small rotating force, and the pipe column is easier to salvage under the condition of serious sand blocking and sand burying.
(3) Compared with the conventional threaded connection of the existing reverse-buckling safety joint, the trapezoidal coarse thread buckle can ensure enough connection force and can be disconnected only by smaller rotating force, and the release and disconnection of the safety joint are facilitated.
(4) The pin with the improved structure can improve the connection stability.
Drawings
Fig. 1 is a schematic view of a coarse thread safety joint structure provided in the first embodiment and the second embodiment;
FIG. 2 is a schematic view of a top terminal structure according to an embodiment;
fig. 3 is a schematic view of a lower plug structure according to an embodiment;
FIG. 4 is a schematic view of a top terminal structure provided in example two;
fig. 5 is a schematic view of a lower plug structure provided in the second embodiment;
fig. 6 is a schematic structural view of the pin.
Illustration of the drawings:
1 upper joint, 2 lower joint, 3 soluble pin, 4 sealing ring,
A large 31 segment, a pin cover 32, a small 33 segment, and a pin snap ring 34.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
The first embodiment is as follows:
referring to fig. 1, 2 and 3, the crude thread safety joint of the oil well pipe string comprises an upper joint 1, a lower joint 2, a soluble pin 3 and a sealing ring 4. The upper connector 1 and the lower connector 2 are connected by screw threads and are fixed by a soluble pin 3. A sealing ring 4 is arranged between the upper joint 1 and the lower joint 2 to seal a gap between the upper joint 1 and the lower joint 2. The threads between the upper joint 1 and the lower joint 2 are trapezoidal thick threads, and the number of thread turns is reduced as much as possible, and 2-5 turns are recommended. The soluble pin 3 is made of magnesium-aluminum alloy material and can be dissolved in acid liquor and formation water. The soluble pin 3 is composed of two sections of cylinders with different diameters, namely a large section 31 and a small section 33, wherein the middle part of the large section 31 is provided with a pin cover surface 32, and the bottom of the small section 33 is provided with a pin snap ring; and a groove for accommodating shifting is arranged on the side surface of the bottom of the pin hole of the upper joint 1 contacted with the pin snap ring. The soluble pin 3 has certain flexibility, and the pin snap ring is arc-shaped and can be smoothly inserted and clamped into the pin groove; the pin cover 32 is designed to have a trapezoidal cross-section so that it can be more conveniently attached to the top of the pin hole to keep the outer wall flat and facilitate fluid flow.
The safety joint provided by the embodiment has the advantages that the upper joint 1 and the lower joint 2 are connected by adopting the reverse-thread-type connection, namely, the thread direction is opposite to that of the standard oil pipe. The safety joint is arranged at the top of the pipe column, and is unlocked by releasing the hand in the reverse direction when the safety joint is blocked, and the safety joint cannot be unlocked in the forward direction.
Example two:
referring to fig. 1, 4 and 5, the second embodiment has the same main structure as the first embodiment, except that the upper joint 1 and the lower joint 2 are connected by positive engagement, i.e. the thread direction is the same as that of the standard oil pipe. The safety joint is arranged between each column supporting pipe (supports forward rotation releasing), and is convenient to salvage by using a reverse-buckling fishing tool in the later period of well repair.
The working principle of the technical scheme is as follows:
install at least one high-pressure sealing joint in operation tubular column or well completion tubular column, sealing washer 4 and thick thread button have certain sealed effect, can bear certain pressure, have prevented that liquid from the seepage flow of safety joint department, have guaranteed that liquid construction pressure can get up to ensure that fracturing construction or bowling are suppressed the operation smoothly. The double fixed connection of thick screw thread and soluble pin 3 provides higher engaging force, guarantees that the phenomenon that the safety joint breaks off in advance is difficult to appear at the lower tubular column operation in-process. After the construction operation is finished, acid liquor is squeezed and injected to dissolve the soluble pin 3, or the soluble pin 3 is automatically dissolved under the action of formation water in the production process. After the soluble pin 3 is dissolved, the connecting force of the safety joint is reduced, but the safety joint cannot be broken due to the connecting effect of the coarse threads, and normal production is not influenced. In the process of salvaging the pipe column, if a back-off safety joint is adopted, reversing the pipe column from the well mouth to enable the safety joint to be tripped; if the positive-buckling safety joint is adopted, the safety joint is tripped by positively rotating the pipe column from the wellhead. After the safety joint is released, the upper joint 2 and the lower joint 2 are separated, and the upper pipe column is smoothly pulled out. Because this moment, soluble pin 3 has dissolved, and go up lower clutch 2 and pass through thick threaded connection, the safety joint back-off is thrown off required tubular column turning force littleer, especially buries under the serious condition at sand card or sand, for current safety joint, the utility model discloses break off more easily, the tubular column is salvaged more easily.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (4)
1. A crude thread safety joint of an oil well pipe column comprises an upper joint and a lower joint; the thread-forming tool is characterized in that the upper part of the upper joint is a female thread of a conical thread, the lower part of the upper joint is a male thread of the conical thread, the female thread of the upper joint is a triangular thread, and the male thread is a trapezoidal thread; the upper part of the lower joint is a female thread of a conical thread, the lower part of the lower joint is a male thread of the conical thread, the female thread of the upper joint is a trapezoidal thread, and the male thread is a triangular thread; the upper joint and the lower joint are connected through respective trapezoidal threads, a pin hole used for installing a soluble pin is formed in the upper side of the trapezoidal thread connection position, the soluble pin is tightly installed in the pin hole, a sealing groove is formed in the lower side of the trapezoidal thread connection position of the upper joint and the lower joint, a sealing ring is arranged in the sealing groove, and a gap between the upper joint and the lower joint is sealed through the sealing ring.
2. The oil well string coarse thread safety joint as recited in claim 1, wherein the number of the thread between the upper joint and the lower joint is 2-5 of trapezoidal coarse thread.
3. The crude threaded well string safety joint of claim 2, wherein the soluble pin is a soluble material.
4. The safety joint for the coarse thread of the oil well pipe string as claimed in claim 3, wherein the soluble pin is composed of two sections of cylinders with different diameters, namely a large section and a small section, the middle part of the large section is provided with a pin cover surface, and the bottom of the small section is provided with a pin snap ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922292907.0U CN211058737U (en) | 2019-12-18 | 2019-12-18 | Oil well pipe column coarse thread safety joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922292907.0U CN211058737U (en) | 2019-12-18 | 2019-12-18 | Oil well pipe column coarse thread safety joint |
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| Publication Number | Publication Date |
|---|---|
| CN211058737U true CN211058737U (en) | 2020-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922292907.0U Active CN211058737U (en) | 2019-12-18 | 2019-12-18 | Oil well pipe column coarse thread safety joint |
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| CN (1) | CN211058737U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827891A (en) * | 2020-08-05 | 2020-10-27 | 田飞 | Petroleum drilling safety joint |
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2019
- 2019-12-18 CN CN201922292907.0U patent/CN211058737U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111827891A (en) * | 2020-08-05 | 2020-10-27 | 田飞 | Petroleum drilling safety joint |
| CN111827891B (en) * | 2020-08-05 | 2022-05-06 | 扬州苏油油成商贸实业有限公司 | Petroleum drilling safety joint |
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