阅读说明：本技术 一种油井泵下长效阳极内防腐装置及其防腐方法 (Long-acting anode internal corrosion prevention device under oil well pump and corrosion prevention method thereof ) 是由 郭钢 李琼玮 戚建晶 杨立华 谷成义 孙雨来 王小勇 卢文伟 付彩利 程碧海 于 2020-11-12 设计创作，主要内容包括：本发明提出一种油井泵下长效阳极内防腐装置,包括：油管、变径转接头和耐温阳极套,油管上连接有抽油泵,抽油泵的下端连接有筛管；变径转接头连接在筛管的下端,变径转接头的下端连接有抽油杆,抽油杆两端导通；耐温阳极套套在抽油杆的外侧,并随着抽油杆向下延伸,耐温阳极套上设置有多个柔性导电触臂；其中,耐温阳极套的外径等于或小于油管的外径。本发明还提出一种油井泵下长效阳极内防腐方法,采用所述油井泵下长效阳极内防腐装置实施。(The invention provides a long-acting anode internal corrosion prevention device under an oil well pump, which comprises: the oil pipe, the reducing adapter and the temperature-resistant anode sleeve are connected with the oil pump, and the lower end of the oil pump is connected with the sieve pipe; the reducing adapter is connected to the lower end of the sieve tube, the lower end of the reducing adapter is connected with a sucker rod, and two ends of the sucker rod are communicated; the temperature-resistant anode sleeve is sleeved on the outer side of the sucker rod and extends downwards along with the sucker rod, and a plurality of flexible conductive contact arms are arranged on the temperature-resistant anode sleeve; wherein, the outer diameter of the temperature-resistant anode sleeve is equal to or less than the outer diameter of the oil pipe. The invention also provides a method for preventing corrosion in the long-acting anode under the oil well pump, which is implemented by adopting the device for preventing corrosion in the long-acting anode under the oil well pump.)

1. The utility model provides an anticorrosive device in long-term positive pole under oil well pump which characterized in that includes:

the oil pump is characterized by comprising an oil pipe (1), wherein an oil well pump (2) is connected to the oil pipe (1), and a sieve tube (3) is connected to the lower end of the oil well pump (2);

the reducing adapter (4) is connected to the lower end of the sieve tube (3), the lower end of the reducing adapter (4) is connected with a sucker rod (5), and two ends of the sucker rod (5) are communicated;

the temperature-resistant anode sleeve (6) is sleeved on the outer side of the sucker rod (5) and extends downwards along with the sucker rod (5), and a plurality of flexible conductive contact arms (7) are arranged on the temperature-resistant anode sleeve (6);

wherein the outer diameter of the temperature-resistant anode sleeve (6) is equal to or less than the outer diameter of the oil pipe (1).

2. The long-acting anode internal corrosion prevention device under the oil well pump as claimed in claim 1, wherein an insulating lining layer (8) is arranged between the temperature-resistant anode sleeve (6) and the sucker rod (5).

3. The long-acting anode internal corrosion prevention device under the oil well pump as claimed in claim 1, wherein an annular gap is formed between the temperature-resistant anode sleeve (6) and the sucker rod (5), and a corrosion inhibitor is filled in the annular gap.

4. The long-acting anode internal corrosion prevention device under an oil well pump as claimed in claim 3, wherein the corrosion inhibitor is potassium polyphosphate.

5. The long-acting anode internal corrosion prevention device under the oil well pump as claimed in claim 1, wherein the flexible conductive contact arms (7) are divided into two groups and symmetrically distributed on the temperature-resistant anode sleeve (6) in a straight line.

6. The long-lasting anode internal corrosion prevention device under oil well pump according to claim 5, wherein the flexible conductive contact arm (7) is SUS304 steel with a diameter of 0.5-1mm, and the angle with the surface of the temperature-resistant anode sleeve in the vertical direction is 45-60 °.

7. The long-acting anode internal corrosion prevention device under the oil well pump as claimed in claim 1, wherein the temperature-resistant anode sleeve (6) is a conventional temperature-resistant sacrificial anode tube composed of aluminum, zinc and indium.

8. A long-acting anode internal corrosion prevention method under an oil well pump is characterized by comprising the following steps:

s001: the lower end of the oil well pump (2) is connected with a sieve tube (3), the lower end of the sieve tube (3) is connected with a reducing adapter (4), the lower end of the reducing adapter (4) is connected with a sucker rod (5), the outer side of the sucker rod (5) is sleeved or coated with a temperature-resistant anode sleeve (6), and the extension length of the temperature-resistant anode sleeve (6) is the distance from the oil well pump (2) to a preset oil well perforation section;

s002: and connecting the temperature-resistant anode sleeve (6) with the anode of a power supply, connecting the oil well casing with the cathode of the power supply, and then lowering the oil well pump (2) into the oil well to enable the lower port of the sucker rod (5) to reach a preset position in the oil well casing, and then switching on the power supply to continuously provide protective current for the inner wall of the oil well casing.

Technical Field

The invention belongs to the technical field of oil exploitation, and particularly relates to a long-acting anode internal corrosion prevention device under an oil well pump and a corrosion prevention method thereof.

Background

The oil field production faces the serious casing corrosion problem, the internal corrosion prevention technology has the oil pipe carried-in anode technology, the sacrificial anode is insulated with the oil pipe, the metal contact wall is contacted with the inner wall of the casing, the current is conveyed to protect the inner wall of the casing, and the oil field application also obtains good application effect. The serious corrosion section in the casing is near the shot hole section of the Jurassic oil well and the position of the pump to the liquid level, so when the oil pipe is led into the anode, the tail pipe is usually required to be deepened to the position near the shot hole section under the oil pump, and the oil pipe is led into the anode at the distance to be uniformly distributed. In some oil wells with deeper perforation sections and deeper sinking degrees, because the protection distance of the sacrificial anode is limited, a plurality of oil pipes need to be put under the pump to be carried into the anode, and the putting position is deeper. The technology has the following problems: 1. when the oil pipe of the oil wells is lifted, the oil pipe is brought into the structure of the anode short section, so that the situation that the drill is stuck, the oil pipe cannot be lifted out, and even the oil pipe is overhauled can occur; 2. because the positive pole nipple joint instrument receives the restriction of oil pipe internal diameter and instrument external diameter in the pit, self quality is less, leads to effectively short excessively. Due to the limitation of the outer diameter (89mm) of the oil pipe and the inner diameter (124mm) of the casing pipe, the anode quality of the anti-corrosion tool in the anode is limited, the effective period is limited (no more than 1 year), and the technical economy is not obvious. Simply extending the life by increasing the anode mass increases the risk of downhole operations.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide a long-lasting anode internal corrosion protection device under an oil well pump and a corrosion protection method thereof, which overcome the above problems or at least partially solve or alleviate the above problems.

The invention provides a long-acting anode internal corrosion prevention device under an oil well pump, which comprises:

the oil pipe is connected with an oil well pump, and the lower end of the oil well pump is connected with a sieve tube;

the reducing adapter is connected to the lower end of the sieve tube, the lower end of the reducing adapter is connected with a sucker rod, and two ends of the sucker rod are communicated;

the temperature-resistant anode sleeve is sleeved on the outer side of the sucker rod and extends downwards along with the sucker rod, and a plurality of flexible conductive contact arms are arranged on the temperature-resistant anode sleeve;

wherein, the outer diameter of the temperature-resistant anode sleeve is equal to or less than the outer diameter of the oil pipe.

The invention also has the following optional features.

Optionally, an insulating lining layer is arranged between the temperature-resistant anode sleeve and the sucker rod at intervals.

Optionally, an annular gap is formed between the temperature-resistant anode sleeve and the sucker rod, and a corrosion inhibitor is filled in the annular gap.

Optionally, the corrosion inhibitor is potassium polyphosphate.

Optionally, the flexible conductive contact arms are divided into two groups, and the flexible conductive contact arms are symmetrically and linearly distributed on the temperature-resistant anode sleeve.

Optionally, the flexible conductive contact arm is made of SUS304 steel with a diameter of 0.5-1mm, and the angle between the flexible conductive contact arm and the surface of the temperature-resistant anode sleeve in the vertical direction is 45-60 degrees.

Optionally, the temperature-resistant anode sleeve is a conventional temperature-resistant sacrificial anode tube composed of aluminum, zinc and indium.

The invention also provides a long-acting anode internal corrosion prevention method under the oil well pump, which comprises the following steps:

s001: the lower end of the oil well pump is connected with a sieve tube, the lower end of the sieve tube is connected with a reducing adapter, the lower end of the reducing adapter is connected with a sucker rod, the outer side of the sucker rod is sleeved or coated with a temperature-resistant anode sleeve, and the extension length of the temperature-resistant anode sleeve is the distance from the oil well pump to a preset oil well perforation section;

s002: and connecting the temperature-resistant anode sleeve with the positive electrode of a power supply, connecting the oil well casing with the negative electrode of the power supply, then putting the oil well pump down into the oil well, and switching on the power supply after the lower port of the oil pumping rod reaches a preset position in the oil well casing to continuously provide protective current for the inner wall of the oil well casing.

The long-acting anode internal corrosion prevention device under the oil well pump and the corrosion prevention method thereof connect the waste sucker rod through the reducing adapter under the pump, the temperature-resistant anode sleeve is sleeved outside the sucker rod and is contacted with the inner wall of the oil well casing pipe to form the rod type anode internal corrosion prevention tool which can be always connected to a high corrosion area near a perforation section, so that the whole underground casing pipe is fully protected, the service life of the oil well casing pipe is prolonged, the outer diameter of the temperature-resistant anode sleeve is consistent with that of a common oil pipe, the risk of drilling blockage is completely avoided, the working period of validity of the tool is greatly prolonged, the tool economy is improved, and the internal corrosion prevention tool is matched with the.

Drawings

FIG. 1 is a schematic view of the overall structure of the long-acting anode internal corrosion prevention device under the oil well pump.

In the above figures: 1, oil pipe; 2, an oil well pump; 3, a sieve tube; 4, a variable-diameter adapter; 5, pumping rods; 6, a temperature-resistant anode sleeve; 7 flexible conductive contact arms; 8 insulating the liner layer.

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Detailed Description

Example 1

Referring to fig. 1, an embodiment of the present invention provides a long-acting anode internal corrosion protection device under an oil well pump, including: the device comprises an oil pipe 1, a reducing adapter 4 and a temperature-resistant anode sleeve 6; the oil pipe 1 is connected with an oil well pump 2, and the lower end of the oil well pump 2 is connected with a sieve pipe 3; the reducing adapter 4 is connected to the lower end of the sieve tube 3, the lower end of the reducing adapter 4 is connected with the sucker rod 5, and two ends of the sucker rod 5 are communicated; the temperature-resistant anode sleeve 6 is sleeved on the outer side of the sucker rod 5 and extends downwards along with the sucker rod 5, and a plurality of flexible conductive contact arms 7 are arranged on the temperature-resistant anode sleeve 6; wherein, the outer diameter of the temperature-resistant anode sleeve 6 is equal to or less than the outer diameter of the oil pipe 1.

The oil pipe 1 adopts a common N80 model or a common J88 model, the 2 inch 7 oil pipe 1 has an outer diameter of 89mm, and the oil well pump 2 and the sieve pipe 3 are conventional equipment for oil field production. The material of reducing adapter 4 is the same with oil pipe 1, by external diameter 89mm reducing to 22mm for oil pipe 1 can pass through threaded connection with sucker rod 5. The material of the sucker rod 5 is the same as that of the oil pipe 1, the sucker rod is a conventional sucker rod 5 or a waste sucker rod 5, the stress meets the use requirement, and the outer diameter is 22 mm.

Connect oil-well pump 2 at oil pipe 1's lower extreme, screen pipe 3 is connected to 2 lower extremes of oil-well pump, the sucker rod 5 is connected through reducing adapter 4 to screen pipe 3, the cladding has temperature resistant positive pole cover 6 on the sucker rod 5, oil-well pump 2 all adopts oil pipe 1 to bring into anodal mode from top to bottom before having changed, through sucker rod 5 greatly increased the quality of temperature resistant positive pole cover 6, the anticorrosive validity period in having prolonged manyfold, the outer external diameter of the temperature resistant positive pole cover 6 of 5 outer cladding of sucker rod is unanimous with ordinary oil pipe 1's external diameter, and contact arm 7 and the contact of oil well sleeve pipe inner wall through flexible electrically conductive, the security that the instrument got up has been guaranteed.

Example 2

Referring to fig. 1, on the basis of example 1, an insulating lining layer 8 is arranged between a temperature-resistant anode sleeve 6 and a sucker rod 5.

The insulating lining layer 8 is made of PVC or nylon 1010, the thickness is 1.5-3mm, and absolute insulation between the sucker rod 5 and the temperature-resistant anode sleeve 6 can be guaranteed.

Example 3

Referring to fig. 1, on the basis of embodiment 1, an annular gap is formed between the temperature-resistant anode sleeve 6 and the sucker rod 5, and a corrosion inhibitor is filled in the annular gap.

The temperature-resistant anode sleeve 6 can be a solid pipe with the inner diameter of 22mm and the outer diameter of 89mm, and is connected with the sucker rod only by an insulating lining layer 8; or the inner diameter is 45-65mm, the outer diameter is 89mm, and a solid corrosion inhibitor or a liquid corrosion inhibitor is filled in a gap between the temperature-resistant anode sleeve 6 and the sucker rod 5.

Example 4

On the basis of example 3, the corrosion inhibitor is potassium polyphosphate.

The temperature-resistant anode sleeve 6 provides protection current to be consumed to a certain degree, and the potassium polyphosphate filled in the temperature-resistant anode sleeve enters a shaft to perform long-acting corrosion inhibition, so that the working period is prolonged.

Example 5

Referring to fig. 1, on the basis of embodiment 1, the flexible conductive contact arms 7 are divided into two groups and symmetrically and linearly distributed on the temperature-resistant anode sleeve 6.

The contact arms are 2 groups, are symmetrically and linearly distributed on the outer wall of the temperature-resistant anode sleeve 6 at intervals of 0.1 meter, and are spot-welded on the outer wall of the temperature-resistant anode sleeve 6.

Example 6

Referring to fig. 1, on the basis of example 5, the flexible conductive contact arm 7 is made of SUS304 steel having a diameter of 0.5 to 1mm and has an angle of 45 ° to 60 ° with respect to the vertical direction with respect to the surface of the temperature-resistant anode sheath 6.

The flexible conductive contact arm 7 is made of SUS304 steel, has the hardness of 35-40HRC, has an angle of 45-60 degrees with the outer wall of the temperature-resistant anode sleeve 6, has the length of 55-65mm, can ensure that the temperature-resistant anode sleeve 6 is in metal connection with the inner wall of the sleeve, and ensures that the anode can continuously provide protective current for the inner wall of the sleeve.

Example 7

Referring to fig. 1, on the basis of example 1, the temperature-resistant anode sleeve 6 is a conventional temperature-resistant sacrificial anode tube composed of aluminum, zinc and indium.

The conventional temperature-resistant sacrificial anode tube consisting of aluminum, zinc and indium has the current efficiency of 35-45 percent and the size as follows: 89mm of outer diameter, 122mm of inner diameter, and 7.8m or 9m of length, and can also be 0.6m of length per section, and a plurality of temperature-resistant anode sleeves 6 are connected to each other to be 7.8m or 9m of length, and the forming process is casting or extrusion casting. A locking device is arranged between the end parts of every two temperature-resistant anode sleeves 6, the temperature-resistant anode sleeves are fixed at the central position on the sucker rod 5 according to the total length of the temperature-resistant anode sleeves 6, the locking device is made of No. 45 steel or more, the locking device needs to be subjected to quenching and tempering treatment, and the lateral locking force is greater than 20 tons.

Example 8

On the basis of any one of the above embodiments, the embodiment of the invention provides a long-acting internal corrosion prevention method for an anode under an oil well pump, which comprises the following steps: s001: the lower end of the oil well pump 2 is connected with a sieve tube 3, the lower end of the sieve tube 3 is connected with a reducing adapter 4, the lower end of the reducing adapter 4 is connected with a sucker rod 5, the outer side of the sucker rod 5 is sleeved or coated with a temperature-resistant anode sleeve 6, and the extending length of the temperature-resistant anode sleeve 6 is the distance from the oil well pump 2 to a preset oil well perforation section; s002: the temperature-resistant anode sleeve 6 is connected with the positive pole of a power supply, the oil well sleeve is connected with the negative pole of the power supply, the oil well pump 2 is placed in an oil well, the lower port of the sucker rod 5 reaches a preset position in the oil well sleeve, the power supply is switched on, and protection current is continuously supplied to the inner wall of the oil well sleeve.

Example 9

Twenty long-acting anode inner anti-corrosion devices under the oil well pump are put into a No. 1 well along with a pump inspection, the well is connected with a sieve tube 3 under an oil well pump 2, the inner diameter of a temperature-resistant anode sleeve 6 of the well is 22mm, the outer diameter of the well is 89mm, the length of the temperature-resistant anode sleeve is consistent with that of a sucker rod 5, the length of a flexible conductive contact arm 7 is 55mm, the diameter of the flexible conductive contact arm is 0.5mm, the well is inspected out of a pipe column after 735 days, and the corrosion rate is reduced from 0.56mm/a to 0.05.

Example 10

Thirty-five long-acting anode inner anti-corrosion devices under the oil well pump are placed in a No. 2 well along with a check pump, the long-acting anode inner anti-corrosion devices are positioned below an oil well pump 2 and connected with a sieve tube 3, the inner diameter of a temperature-resistant anode sleeve 6 of the long-acting anode inner anti-corrosion devices is 22mm, the outer diameter of the temperature-resistant anode sleeve is 89mm, the length of the temperature-resistant anode sleeve is consistent with that of an oil pumping rod 5, the length of a flexible conductive contact arm 7 is 65mm, the diameter of the flexible conductive contact arm is 1mm, a pipe column is lifted.

Example 11

Thirty five long-acting anode inner anti-corrosion devices under a certain No. 3 well pump are put in the oil well pump of the invention along with a check pump, the long-acting anode inner anti-corrosion devices are positioned below an oil well pump 2 and are connected with a sieve tube 3 and are uniformly distributed 720m below the liquid level, a sucker rod 5 is provided with a temperature-resistant anode sleeve 6 and a common oil pipe 1 are sequentially connected through a reducing adapter 4, the inner diameter and the outer diameter of the temperature-resistant anode sleeve 6 are 22mm and 89mm, the length of the temperature-resistant anode sleeve is consistent with that of the sucker rod 5, the length of a flexible conductive contact arm 7 is 60mm, the diameter of the flexible conductive contact arm is 1mm, a pump is checked.

Example 12

Fifteen pieces of long-acting anode inner anti-corrosion devices under the oil well pump are placed in a No. 4 well along with a check pump, the long-acting anode inner anti-corrosion devices are directly connected with a sieve tube 3 below an oil well pump 2, the inner diameter of a temperature-resistant anode sleeve 6 is 50mm, the outer diameter is 89mm, the length is consistent with that of a sucker rod 5, and 15 kg/branch of corrosion inhibitor potassium polyphosphate is filled in an annular space. The length of the flexible conductive contact arm 7 is 65mm, the diameter is 1mm, the pump is checked and taken out of the pipe column in 856 days, and the coupon data show that the corrosion rate is reduced from 1.06mm/a to 0.03 mm/a.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.