CN107313721B - External current method anticorrosion device for pumping well - Google Patents
External current method anticorrosion device for pumping well Download PDFInfo
- Publication number
- CN107313721B CN107313721B CN201710310430.7A CN201710310430A CN107313721B CN 107313721 B CN107313721 B CN 107313721B CN 201710310430 A CN201710310430 A CN 201710310430A CN 107313721 B CN107313721 B CN 107313721B
- Authority
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- Prior art keywords
- oil
- pipe
- oil pipe
- sleeve
- sucker rod
- Prior art date
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- 238000005086 pumping Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 8
- 239000003129 oil well Substances 0.000 claims abstract description 15
- 230000005611 electricity Effects 0.000 claims description 8
- 239000012212 insulator Substances 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 20
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 description 13
- 239000004020 conductor Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The utility model relates to an anti-corrosion device on an oil pumping well in an oil field, in particular to an external current method anti-corrosion device for the oil pumping well. Including the polished rod eye, the sucker rod string, go out oil pipe and lead to, oil pipe, sleeve pipe, oil-well pump and DC power supply, wherein the sleeve pipe is installed in the pit shaft, in the sleeve pipe is gone into after installing the oil-well pump on the oil pipe, the upper portion and the sleeve pipe insulating connection of oil pipe, the lower part and the oil pipe that go out oil pipe and lead to are connected, in the sucker rod string goes into the oil pipe, and the lower part is connected with the piston of oil-well pump, the upper portion of sucker rod string passes out oil pipe and leads to and be connected with the polished rod eye is insulating, a plurality of nonconductive centralizers are installed to the interval on the oil pipe, DC power supply's negative pole is connected on going out oil pipe and is led to, DC power supply's positive pole ground, the tail end and the sleeve pipe are led to through the contact, form closed circuit. The utility model improves the service life of sucker rod, oil pipe, oil pump, sleeve and down-hole tool of the pumping well, and improves the economic benefit of the oil well.
Description
Technical Field
The utility model relates to an anti-corrosion device on an oil pumping well in an oil field, in particular to an external current method anti-corrosion device for the oil pumping well.
Background
The problems of corrosion of sucker rods, oil pipes, oil pumps, sleeves and downhole tools of the pumping well exist, and various measures for preventing the corrosion exist at present, but the corrosion is performed on a single tool, for example, the patent number is 201220522703.7, the Chinese patent is named as high-pressure polyethylene corrosion-resistant oil pipe, namely, the corrosion of the oil pipe is only performed, and the corrosion of other tools in the well is not performed; for example, the Chinese patent with the patent number of 201410796659.2, named as anti-corrosion sucker rod, can only prevent corrosion to the sucker rod and can not prevent corrosion to other tools in the well; and as for the patent number 201220650010.6, the Chinese patent is named as a long tail pipe casing corrosion-resistant well-flushing protection device, and can only prevent corrosion of the casing and can not prevent corrosion of other tools in the well. The corrosion prevention measures are limited, so that the corrosion problems still exist in the sucker rod, the oil pipe, the oil pump, the sleeve and the downhole tool of the pumping well, the service lives of the sucker rod, the oil pipe, the oil pump, the sleeve and the downhole tool of the pumping well are short, frequent well repair operation is needed, the oil production cost is high, and the economic benefit is poor.
Disclosure of Invention
Aiming at the problems, the utility model aims to provide an external current method anticorrosion device for a pumping well, which is used for overcoming the problems, prolonging the service lives of a pumping rod, an oil pipe, an oil pump, a sleeve and a downhole tool of the pumping well, reducing the well repairing operation of the pumping well, reducing the oil production cost and improving the economic benefit of the oil well.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides an anticorrosive device of pumping well impressed current method, includes rope hanger, sucker rod post, play oil pipe lead to, oil pipe, sleeve pipe, oil-well pump and DC power supply, wherein the sleeve pipe is installed in the pit shaft, in the sleeve pipe is gone into after installing the oil-well pump on the oil pipe, the upper portion of oil pipe with sleeve pipe insulating connection, the lower part that goes out the oil pipe and lead to is connected with oil pipe, the sucker rod post go into in the oil pipe, and the lower part with the piston of oil-well pump is connected, the upper portion of sucker rod post passes go out the oil pipe and lead to and be connected with rope hanger insulating, rope hanger is connected with the beam-pumping unit, a plurality of nonconductive centralizers of interval installation on the oil pipe, DC power supply's positive pole ground, the tail end of oil pipe and sleeve pipe are through contact conduction, make the electricity lead to the sleeve pipe from the upper end through the tail end conduction of oil pipe, again form closed circuit with DC power supply's positive pole through ground.
The tail end of the oil pipe is provided with a conductive device, the outer part of the conductive device is in contact with the sleeve, and the conductive device guides the electricity of the tail end of the oil pipe into the sleeve.
An oil outlet is arranged on the side surface of the oil outlet pipe, and the oil outlet is connected with an oil outlet pipeline through an insulating part.
The upper part of the sleeve is provided with a sleeve connecting device, the upper part of the oil pipe is connected with a hanger, the upper part of the oil pipe is hung on the sleeve connecting device through the hanger, an insulating cylinder is arranged between the hanger and the sleeve connecting device, and the lower part of the oil outlet pipe is connected with the hanger.
The side of the sleeve connecting device is provided with a valve which is used for controlling the pressure of the sleeve.
And the sleeve connecting device is provided with an anti-channeling mechanism for preventing the oil pipe from being shifted.
The lower part of the oil outlet pipe is connected with the sleeve connecting device through a flange, and an insulating part is arranged between the flange and the sleeve connecting device.
The insulating cylinder is of a conical structure and is matched with conical surfaces of the hanger and the sleeve connecting device.
The upper portion of the sucker rod string penetrates through the sealer to be connected with the rope hanging device in an insulating mode, the sealer is located above the oil outlet pipe, and the lower portion of the sucker rod string is connected with the upper portion of the oil outlet pipe.
An insulator is arranged between the upper part of the sucker rod string and the connecting part of the rope hanger, so that the sucker rod string is not electrically conductive with the rope hanger.
The utility model has the advantages and beneficial effects that: the cathode of the direct current power supply is connected to the oil outlet pipe, the anode of the direct current power supply is grounded, and after the circuit is communicated, the sucker rod string, the oil pipe, the sleeve and the downhole tool are polarized by the cathode, so that the sucker rod string, the oil pipe and the sleeve are completely cathode-protected, and corrosion of the sucker rod string, the oil pipe, the sleeve and the downhole tool is prevented. Therefore, the utility model overcomes the defects in the prior anti-corrosion technology adopted in the pumping well, can prevent the sucker rod column, the oil pipe, the sleeve and the downhole tool of the pumping well from being corroded, can improve the service life of the sucker rod, the oil pipe, the oil pump, the sleeve and the downhole tool of the pumping well, reduces the well repairing operation of the pumping well, lowers the oil production cost and improves the economic benefit of the oil well.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
In the figure: 1 is a rope hanger, 2 is an insulator, 3 is a sucker rod string, 4 is a sealer, 5 is an oil outlet pipe, 6 is a hanger, 7 is an insulating cylinder, 8 is a sleeve connecting device, 9 is a non-conductive centralizer, 10 is an oil pipe, 11 is a sleeve, 12 is an oil pump, 13 is a conductor, and 14 is a direct current power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the corrosion prevention device for the externally applied current method of the pumping well provided by the utility model comprises a rope hanger 1, a sucker rod column 3, an oil outlet pipe through 5, an oil pipe 10, a sleeve 11, an oil pump 12 and a direct current power supply 14, wherein the sleeve 11 is arranged in a shaft, the oil pump 12 is arranged on the oil pipe 10 and then is put into the sleeve 11, the upper part of the oil pipe 10 is in insulating connection with the sleeve 11, the lower part of the oil outlet pipe through 5 is connected with the oil pipe 10, the sucker rod column 3 is put into the oil pipe 10, the lower part of the sucker rod column is connected with a piston of the oil pump 12, the upper part of the sucker rod column 3 passes through the oil outlet pipe through 5 and is in insulating connection with the rope hanger 1, the rope hanger 1 is connected with the oil pumping unit, and a plurality of non-conductive centralizers 9 are arranged on the oil pipe 10 at intervals. The cathode of the direct current power supply 14 is connected to the oil outlet pipe 5, the anode of the direct current power supply 14 is grounded, the tail end of the oil pipe 10 is communicated with the sleeve 11 through contact, so that electricity is conducted from the upper end of the oil pipe 10 to the sleeve 11 through the tail end, and then a closed loop is formed between the earth and the anode of the direct current power supply 14.
An insulator 2 is installed between the upper part of the sucker rod string 3 and the junction of the rope hanger 1 so that the sucker rod string 3 is not electrically conductive with the rope hanger 1. The upper part of the sucker rod string 3 is connected with the rope hanger 1 in an insulating way through a sealer 4, the sealer 4 is positioned above the oil outlet pipe 5, and the lower part is connected with the upper part of the oil outlet pipe 5.
Further, a conductive device 13 is installed at the tail end of the oil pipe 10, the outside of the conductive device 13 is in contact with the sleeve 11, and the conductive device 13 guides the electricity of the tail end of the oil pipe 10 into the sleeve 11. The electric conductor 13 is made of metal conductive material, and has a shape similar to a centralizer, so that the oil pipe 10 and the sleeve 11 are forced to be connected and electrically conducted.
An oil outlet is arranged on the side face of the oil outlet pipe 5, and the oil outlet is connected with an oil outlet pipeline through an insulating part.
The upper part of the sleeve 11 is provided with a sleeve connecting device 8, the upper part of the oil pipe 10 is connected with a hanger 6, the upper part of the oil pipe 10 is hung on the sleeve connecting device 8 through the hanger 6, an insulating cylinder 7 is arranged between the hanger 6 and the sleeve connecting device 8, and the lower part of the oil outlet pipe 5 is connected with the hanger 6.
The side of the casing connection 8 (i.e. the large four-way joint of the wellhead) is provided with a valve for controlling the pressure of the casing 11. In order to prevent the oil pipe 10 from moving upwards, a channeling preventing mechanism for preventing the oil pipe 10 from moving upwards is arranged on the sleeve connecting device 8.
The anti-channeling mechanism may specifically employ a jackscrew disposed on a flange of the casing connection device 8, which is used to press the hanger 6 to prevent the hanger 6 from being shifted.
Further, the insulating cylinder is in a conical structure and is matched with conical surfaces of the hangers 6 and the sleeve connecting device at two sides.
The lower part of the oil outlet pipe 5 is connected with the sleeve connecting device 8 through a flange, and an insulating part is arranged between the flange and the sleeve connecting device 8.
The working principle of the utility model is as follows:
a plurality of non-conductive centralizers 9 are arranged on the oil pipe 10 at intervals, so that the oil pipe 10 is not contacted with the sleeve 11 except the conductor 13, an insulating cylinder 7 is arranged between the hanger 6 and the sleeve connecting device 8, and the upper part of the sleeve 11 is non-conductive with the upper part of the oil pipe 10 and the oil outlet pipe 5; an insulator 2 is installed between the upper part of the sucker rod string 3 and the junction of the rope hanger 1 so that the sucker rod string 3 is not electrically conductive with the rope hanger 1. The cathode of the direct current power supply 14 is connected to the oil outlet pipe 5, the anode of the direct current power supply 14 is grounded, the tail end of the oil pipe 10 is communicated with the sleeve 11 through contact, so that electricity is conducted to the sleeve 11 from the upper end of the oil pipe 10 through the electric conductor 13, and then a closed loop is formed between the earth and the anode of the direct current power supply 14. The side oil outlet of the oil outlet pipe 5 is connected with an oil outlet pipe, and the oil outlet pipe is connected with an insulating part, so that electricity is blocked at the insulating part, current cannot flow along the oil outlet pipe, the current flows according to a designed circuit, and the insulating part is close to the joint of the oil outlet pipe 5.
Other downhole tools, such as a packer, can also be connected to the tubing 10, and the downhole tools that are run in will not conduct electricity between the tubing 10 and the casing 11, ensuring that current flows away according to the designed line.
The uppermost sucker rod string 3 is called a polish rod, and the surface of the sucker rod string is relatively smooth and is convenient to be matched and sealed with a sealer, so that the extracted liquid flow can only flow out from the oil outlet on the side surface of the oil outlet pipe 5.
The utility model is also suitable for drainage and gas production of the coal-bed gas well. If the oil well is an inclined well, after the oil pipe 10 at the lower part of the oil pump 12 has a certain length, the tail end of the oil pipe 10 can be contacted with the sleeve 11, and the installation of the electric conductor 13 is not needed.
In summary, the cathode of the dc power supply 14 is connected to the oil outlet pipe 5 through a wire, the anode of the dc power supply 14 is grounded, and after the circuit is connected, the sucker rod string 3, the oil pipe 10, the casing 11 and the downhole tool are cathodically polarized, so that the sucker rod string 3, the oil pipe 10 and the casing 11 are completely cathodically protected, thereby preventing the sucker rod string 3, the oil pipe 10, the casing 11 and the downhole tool from being corroded. Therefore, the utility model overcomes the defects in the prior anti-corrosion technology adopted in the pumping well, can prevent the sucker rod column, the oil pipe, the sleeve and the downhole tool of the pumping well from being corroded, can improve the service life of the sucker rod, the oil pipe, the oil pump, the sleeve and the downhole tool of the pumping well, reduces the well repairing operation of the pumping well, lowers the oil production cost and improves the economic benefit of the oil well.
The foregoing is merely an embodiment of the present utility model and is not intended to limit the scope of the present utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present utility model are included in the protection scope of the present utility model.
Claims (1)
1. The utility model provides an additional current method anticorrosion device of pumping well, its characterized in that, including polished rod eye (1), sucker rod string (3), go out oil pipe and lead to (5), oil pipe (10), sleeve pipe (11), oil-well pump (12) and DC power supply (14), wherein sleeve pipe (11) are installed in the pit shaft, install in sleeve pipe (11) behind oil-well pump (12) on oil pipe (10), the upper portion of oil pipe (10) with sleeve pipe (11) insulating connection, the lower part that goes out oil pipe and lead to (5) with oil pipe (10) are connected, sucker rod string (3) go into oil pipe (10) down, and the lower part with the piston connection of oil-well pump (12), the upper portion of sucker rod string (3) passes oil pipe and lead to (5) and polished rod eye (1) insulating connection, polished rod (1) and oil-well pump are connected, a plurality of non-conductive centralizers (9) are installed to the interval on oil pipe (10), DC power supply (14) negative pole connection is on oil pipe (5) tail end, the tail end is led to oil pipe (10) and is connected with oil pipe (10), and can prevent through connecting with the positive pole (10) from leading to the earth through the oil pipe (11), can be through the closed with the positive pole (11), the electric current can be prevented from leading to the oil pipe (11) to the earth through the end through the sleeve pipe (11) to the earth, and the electric motor (12) is closed The casing and the downhole tool of the pumping well are corroded;
the upper part of the sleeve (11) is provided with a sleeve connecting device (8), the upper part of the oil pipe (10) is connected with a hanger (6), the upper part of the oil pipe (10) is hung on the sleeve connecting device (8) through the hanger (6), an insulating cylinder (7) is arranged between the hanger (6) and the sleeve connecting device (8), and the lower part of the oil outlet pipe (5) is connected with the hanger (6);
the sleeve connecting device (8) is provided with an anti-channeling mechanism for preventing the oil pipe (10) from being shifted;
the anti-channeling mechanism can adopt jackscrews arranged on a flange of the sleeve connecting device (8);
a conductive device (13) is arranged at the tail end of the oil pipe (10), the outer part of the conductive device (13) is in contact with the sleeve (11), and the conductive device (13) is used for introducing the electricity at the tail end of the oil pipe (10) into the sleeve (11);
an oil outlet is arranged on the side surface of the oil outlet pipe (5), and the oil outlet is connected with an oil outlet pipeline through an insulating part;
the side surface of the sleeve connecting device (8) is provided with a valve which is used for controlling the pressure of the sleeve (11);
the lower part of the oil outlet pipe (5) is connected with the sleeve connecting device (8) through a flange, and an insulating part is arranged between the flange and the sleeve connecting device (8);
the insulating cylinder (7) is of a conical structure and is matched with conical surfaces of the hanger (6) and the sleeve connecting device (8);
the upper part of the sucker rod string (3) passes through a sealer (4) to be connected with the rope hanger (1) in an insulating way, the sealer (4) is positioned above the oil outlet pipe (5), and the lower part of the sealer is connected with the upper part of the oil outlet pipe (5);
an insulator (2) is arranged between the upper part of the sucker rod string (3) and the connecting part of the rope hanger (1), so that the sucker rod string (3) is not electrically conductive with the rope hanger (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710310430.7A CN107313721B (en) | 2017-05-04 | 2017-05-04 | External current method anticorrosion device for pumping well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710310430.7A CN107313721B (en) | 2017-05-04 | 2017-05-04 | External current method anticorrosion device for pumping well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107313721A CN107313721A (en) | 2017-11-03 |
| CN107313721B true CN107313721B (en) | 2024-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710310430.7A Active CN107313721B (en) | 2017-05-04 | 2017-05-04 | External current method anticorrosion device for pumping well |
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| CN (1) | CN107313721B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112129501A (en) * | 2020-08-28 | 2020-12-25 | 中国石油天然气股份有限公司 | Device and method for predicting service life of sucker rod centralizer |
| CN112695329A (en) * | 2020-11-12 | 2021-04-23 | 中国石油天然气股份有限公司 | Long-acting anode internal corrosion prevention device under oil well pump and corrosion prevention method thereof |
| CN113957444A (en) * | 2021-09-14 | 2022-01-21 | 陕西省建文能源科技有限公司 | Intelligent impressed current anti-corrosion system for oil and gas well |
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| CN107313721A (en) | 2017-11-03 |
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