Sucker-rod pump lifting system

Abstract

The utility model discloses a sucker-rod pump lifting system. The device comprises an oil pipe, a sucker rod, a rod oil well pump, a sucker rod of a lifting rod string, an oil well pump, a packer and a pump anchor which are sequentially connected from top to bottom, the lifting rod column is arranged in the oil pipe; the packer is a self-sealing type two-stage packer; the pump anchor is an anti-corrosion mechanical pump anchor, and the lifting rod column is anchored in the oil pipe. The packer has the beneficial effects that the structural design is reasonable, the lifting rod column is arranged in the oil pipe, the packer is simple in structure, the mechanical pump anchor has the anchoring characteristics of being simple in structure and convenient to operate for seat clamping, the pump hanging position can be flexibly adjusted, and the labor cost is greatly reduced; oil pipe lifting is not needed during pump inspection, and the pump inspection operation efficiency is effectively improved; the lifting rod column has good corrosion resistance, and the adaptability to corrosive well conditions is higher.

Description

Technical Field

[0001] The utility model relates to a lifting system, in particular to a rod pump lifting system, belonging to the technical field of oil and gas development. Background Art

[0002] Rod pumping is a mechanical oil production technology widely used in oilfield development due to its simple structure, easy maintenance, and long service life. A typical rod pumping system mainly consists of ground drive equipment, a downhole sucker rod string, and a well pump installed at the bottom of the oil pipe. Each component has a variety of specifications and types to meet the oil production process requirements of different oilfields. However, the pump hanging adjustment method of the rod pumping system is inflexible and can only be achieved by adjusting the position of the pump barrel or the seal by raising and lowering the oil pipe. This operation is arduous and time-consuming. Moreover, most oilfields have entered the middle and late stages of production, and the corrosive environment is more severe. This has led to an increasing frequency of pump inspections and more frequent raising and lowering of the oil pipe, resulting in a significant increase in production and operation costs. Utility Model Content

[0003] In order to overcome the shortcomings of the existing rod pump system, such as inflexible pump hanging adjustment method, large workload, long time consumption, increased frequency of pump inspection operations, and significantly increased production and operation costs, the utility model provides a rod pump lifting system.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a rod pump lifting system, including an oil pipe and a lifting rod column, the lifting rod column includes a sucker rod, a rod pump, a packer, and a pump anchor, and the sucker rod, the rod pump, the packer, and the pump anchor are connected in sequence from top to bottom; the lifting rod column is arranged in the oil pipe; the packer is a self-sealing double-stage packer; the pump anchor is an anti-corrosion mechanical pump anchor, which anchors the lifting rod column in the oil pipe.

[0005] The packer adopts a self-sealing double-stage packer, the packer has a built-in skeleton, and the external rubber tube is provided with a skirt, which is interference-fitted with the inner hole of the oil pipe.

[0006] The pump anchor is a corrosion-resistant mechanical pump anchor, which is clamped by weight and released by lifting the rod column.

[0007] The rod body of the sucker rod is an upset-forged solid sucker rod, and the surface of the rod body is coated with a tungsten alloy.

[0008] The thickness of the tungsten alloy coating on the rod body of the sucker rod is 30-50 μm, and the coating hardness is 600-650 HV.

[0009] The oil well pump is an anti-corrosion oil well pump. The surface of the pull rod of the oil well pump is plated with a tungsten alloy coating, the inner surface of the pump barrel is chrome-plated, the outer surface of the plunger is spray-welded with nickel alloy, the valve ball is made of titanium carbide, the valve seat is made of tungsten carbide, and the connection components are all made of 3Cr13.

[0010] The lifting rod column is sent into the oil pipe by the sucker rod at the upper end and moves downward by its own weight. When the lifting rod column is lowered to the designed position, the lifting rod column is lifted up and then lowered again to complete the lifting rod column seating. The packer separates the oil pipe into two parts, the upper and lower parts; the sucker rod is lifted up and the pump anchor is unsealed; the sucker rod is continued to be lifted up to remove the lifting rod column from the oil pipe.

[0011] The beneficial effects of the present invention are that the structural design is reasonable, the lifting rod column is arranged in the oil pipe, the sealing device has a simple structure, and the mechanical pump anchor has a simple structure and is easy to operate for anchoring. The pump hanging position can be flexibly adjusted, which greatly reduces labor costs; there is no need to lift and lower the oil pipe when inspecting the pump, which effectively improves the efficiency of the pump inspection operation; the lifting rod column has good corrosion resistance and is more adaptable to corrosive well conditions, which can further extend the pump inspection cycle and reduce production and operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the rod pump lifting system of the utility model.

[0013] In the figure: 1. Sucker rod, 2. Oil pump, 3. Packer, 4. Pump anchor, 5. Casing, 6. Tubing, 7. Pumping unit, 8. Polished rod, 9. Wellhead assembly, 10. Lifting rod string. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific embodiments listed, and any embodiments that conform to the spirit of the present invention should be included within the scope of protection of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0016] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," "connected," and "sealed" should be understood broadly. For example, a connection can be a fixed connection, a removable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a communication between the internal parts of two components. A seal can be an oil seal, a packing seal, or other forms of seal. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0017] See attached Figure 1 The utility model discloses a sucker rod pump lifting system, comprising an oil pipe 6 and a lifting rod string 10. The lifting rod string 10 comprises a sucker rod 1, a sucker rod pump 2, a packer 3, and a pump anchor 4. The sucker rod 1, the sucker rod pump 2, the packer 3, and the pump anchor 4 of the lifting rod string 10 are sequentially connected from top to bottom; the lifting rod string 10 is disposed within the oil pipe 6.

[0018] The packer 3 is a self-sealing double-stage packer; the pump anchor 4 is an anti-corrosion mechanical pump anchor, which anchors the lifting rod string 10 in the oil pipe 6.

[0019] The packer 3 is a self-sealing double-stage packer with a built-in frame. The outer rubber tube is provided with a skirt, which is interference-fitted with the inner hole of the oil pipe 6 .

[0020] The pump anchor 4 is a corrosion-resistant mechanical pump anchor, and its working principle is to lock it by pressing weight and to release it by lifting the rod column.

[0021] The rod body of the sucker rod 1 is an upset-forged solid sucker rod, and the surface of the rod body is coated with a tungsten alloy.

[0022] The thickness of the tungsten alloy coating on the rod body of the sucker rod 1 is 30-50 μm, and the coating hardness is 600-650 HV.

[0023] The oil well pump 2 is an anti-corrosion oil well pump. The surface of the pull rod of the oil well pump 2 is plated with a tungsten alloy coating, the inner surface of the pump barrel is chrome-plated, the outer surface of the plunger is spray-welded with nickel alloy, the valve ball is made of titanium carbide, the valve seat is made of tungsten carbide, and the connection component materials are all 3Cr13. The oil well pump 2 has good corrosion resistance.

[0024] The lifting rod column 10 is set in the following manner: the lifting rod column 10 is sent into the oil pipe 6 by the sucker rod at the upper end, and moves downward by its own weight. When the lifting rod column 10 is lowered to the designed position, the lifting rod column 10 is lifted up for one meter and then lowered again to complete the setting of the lifting rod column 10. The packer 3 separates the inside of the oil pipe into two parts, upper and lower.

[0025] The lifting rod string 10 is unsealed by lifting the sucker rod 1 upwards to unseal the pump anchor 4 ; and then continuing to lift the sucker rod 1 upwards to remove the lifting rod string 10 from the oil pipe 6 .

[0026] This new pump-on-rod lifting system connects a mechanical pump anchor, a self-sealing packer, an anti-corrosion oil well pump, and a tungsten-coated sucker rod in sequence and then lowers it into the tubing. When it reaches the designated pump-hanging position, the mechanical pump anchor is used to lock it in place. The packer separates the tubing from top to bottom, allowing well fluid to enter the pump-on-rod lifting system from the bottom of the pump anchor and then enter the oil well pump through the packer. The pump anchor, packer, and pump barrel are fixed in place, while the sucker rod drives the pump plunger in reciprocating motion, discharging the well fluid above the packer through the tubing to the surface. To remove the pump, simply lift the rod string to unblock it. Then, as the sucker rod slowly ascends, the pump, packer, and pump anchor are removed from the tubing.

[0027] The rod pump lifting system of the utility model has a stronger adaptability to corrosive well conditions, can further extend the pump inspection cycle, and reduce production operation and maintenance costs; compared with conventional tube pumps, the pump barrel of the oil pump does not need to be connected to the oil pipe, and there is no need to lift and lower the oil pipe when inspecting the pump, so the pump inspection efficiency is high; compared with conventional rod pumps, there is no need to design a sealing support, and the mechanical pump anchor has a simple structure and easy operation for seating, and the pump hanging depth can be adjusted without lifting and lowering the oil pipe. The pump hanging position can be flexibly adjusted, which can greatly save labor costs.

[0028] Example

[0029] The utility model has a rod pump lifting system, including an oil pipe 6, a lifting rod column 10, a sucker rod 1, a sucker pump 2, a packer 3, and a pump anchor 4 of the lifting rod column 10 connected in sequence from top to bottom; the lifting rod column 10 is arranged in the oil pipe 6 (such as Figure 1 shown).

[0030] The rod body of the sucker rod 1 is an upset-forged solid sucker rod, and the surface of the rod body is coated with a tungsten alloy layer. The thickness of the tungsten alloy layer is 30 to 50 μm, and the hardness of the layer is 600 to 650 HV.

[0031] The oil well pump 2 is an anti-corrosion oil well pump. The surface of the pull rod of the oil well pump 2 is coated with tungsten alloy, the inner surface of the pump barrel is chrome-plated, the outer surface of the plunger is spray-welded with nickel alloy, the valve ball is made of titanium carbide, the valve seat is made of tungsten carbide, and the connecting component materials are all 3Cr13. The oil well pump 2 has good corrosion resistance and is more adaptable to corrosive well conditions. It can further extend the pump inspection cycle and reduce production operation and maintenance costs.

[0032] The packer 3 uses a self-sealing, two-stage packer, specifically the Z331 model. This self-sealing, two-stage packer features an internal frame and an external rubber sleeve with a skirt. The skirt has an interference fit with the tubing bore, dividing the tubing into two sections. Its simple structure reduces resistance during tubing tripping and lowering, making it easy to operate.

[0033] The pump anchor 4 is a corrosion-resistant mechanical pump anchor that anchors the lifting rod 10 in the oil pipe 6. The mechanical oil pipe anchoring equipment model JYMD69×32 is selected. The pump anchor adopts a one-way slip anchoring method. The weight is lowered to set the card, and the rod is lifted to release the card.

[0034] The ground device of the present utility model is that the sucker rod at the upper end of the lifting rod column 10 is connected to the polished rod 8, the polished rod 8 passes upward through the wellhead device 9, and is connected to the pumping unit 7 through the suspension rope. The up and down reciprocating motion of the pumping unit 7 drives the rod pump 2 to work and perform oil and gas extraction operations.

[0035] The downhole device of the present invention is that the casing 5, the oil pipe 6, and the lifting rod string 10 are coaxially arranged from the outside to the inside. The lifting rod string 10 is sent into the oil pipe 6 by the sucker rod at the upper end and moves downward along the oil pipe by its own weight. When the oil pump 2 is lowered to the designed depth position, the plunger is first lifted to the top of the pump barrel, and then the lifting rod string is lifted upward for about one meter, and the lifting rod string 10 is lowered again until the pump anchor 4 is seated, completing the anchoring of the lifting rod string 10; the outer rubber tube skirt of the packer 3 is interference fit with the inner hole of the oil pipe 6, dividing the inside of the oil pipe into upper and lower parts; the pumping unit 7 starts to operate, driving the oil pump 2 to perform oil production operations.

[0036] When the oil well pump needs to be inspected, the pump anchor 4 can be unstuck by simply lifting the sucker rod 1 upwards. The pump anchor 4 can then be unstuck by continuing to lift the sucker rod 1 upwards to remove the lifting rod string 10 from the oil pipe 6. Because the pump barrel of the oil well pump is not connected to the oil pipe, there is no need to trip or untie the oil pipe during pump inspection, which improves pump inspection efficiency. The simple and easy-to-operate anchoring characteristics of the mechanical pump anchor allow for anchoring, and the pump hanging depth can be adjusted without tripping or untieing the oil pipe, allowing for flexible adjustment of the pump hanging position to meet the production needs of the oil well and significantly saving labor costs.

[0037] It should be noted that the above-mentioned embodiments are examples rather than limitations of the present invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A rod pump lifting system, comprising an oil pipe and a lifting rod string, characterized by: The lifting rod string includes a sucker rod, a sucker rod pump, a packer, and a pump anchor, which are connected in sequence from top to bottom; the lifting rod string is arranged in the oil pipe; The packer is a self-sealing double-stage packer; The pump anchor is an anti-corrosion mechanical pump anchor, which anchors the lifting rod column in the oil pipe.

2. The rod pump lifting system according to claim 1, characterized in that: The packer adopts a self-sealing double-stage packer, the packer has a built-in skeleton, and the external rubber tube is provided with a skirt, which is interference-fitted with the inner hole of the oil pipe.

3. The rod pump lifting system according to claim 1, characterized in that: The pump anchor is a corrosion-resistant mechanical pump anchor, which is clamped by weight and released by lifting the rod column.

4. The rod pump lifting system according to claim 1, characterized in that: The rod body of the sucker rod is an upset-forged solid sucker rod, and the surface of the rod body is coated with a tungsten alloy.

5. The rod pump lifting system according to claim 4, characterized in that: The thickness of the tungsten alloy coating on the rod body of the sucker rod is 30-50 μm, and the coating hardness is 600-650 HV.

6. The rod pump lifting system according to claim 1, characterized in that: The oil well pump is an anti-corrosion oil well pump. The surface of the pull rod of the oil well pump is plated with a tungsten alloy coating, the inner surface of the pump barrel is chrome-plated, the outer surface of the plunger is spray-welded with nickel alloy, the valve ball is made of titanium carbide, the valve seat is made of tungsten carbide, and the connection components are all made of 3Cr13.

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