Long-piston sand pumping pump with liquid leakage

Abstract

The utility model discloses a kind of long-piston sand setting sand prevention oil well pumps of liquid release type, including pump barrel assembly, plunger assembly, outer tube assembly, fixed valve assembly and double-pass joint assembly, the pump barrel assembly includes lengthening pipe, outer tube assembly includes outer tube, fixed valve assembly includes upper end fixed valve cover, the outer tube assembly is formed with annular space sand setting channel between pump barrel assembly and fixed valve assembly, it is characterized by: still including tubular valve body, the outer wall of tubular valve body two ends is connected with the outer tube respectively, the inner wall of two ends is connected with the lengthening pipe and upper end fixed valve cover respectively, valve core is loaded in tubular valve body, the valve body inside two sides of valve core is also provided with sand setting connection channel, which is communicated with the annular space sand setting channel, when the valve core is broken, the communication of rod pipe annulus and oil jacket annulus can be realized. After the utility model is applied, the communication of rod pipe annulus and oil jacket annulus can be realized when pump is inspected, and then oil pipe is not caused ground pollution when being pulled out.

Description

Technical Field

[0001] This utility model relates to a long plunger sand-sinking and sand-prevention oil pump, specifically a drainable long plunger sand-sinking and sand-prevention oil pump. Background Technology

[0002] In many oilfields in my country, the reservoirs are composed of sandstone, which has a loose structure and results in severe sand production in oil wells. When using conventional integral tubular pumps, problems such as sand jamming the plunger, sand burying the sucker rod, and sand abrading the pump barrel and plunger frequently occur, leading to premature pump failure. This is particularly problematic in wells with high fluid salinity and severe corrosion, where sand abrasion damages the anti-corrosion and wear-resistant layers of the pump barrel and plunger, increasing pump leakage and reducing pump efficiency.

[0003] Existing long-plunger sand-sinking oil pumps include a pump barrel assembly, a plunger assembly, an outer tube assembly, a fixed valve assembly, and a double-connector assembly. The pump barrel assembly includes a pump barrel and an extension tube; the plunger assembly includes a plunger; the outer tube assembly includes an outer tube and an upper connector; the fixed valve assembly includes an upper fixed valve cover and a lower fixed valve seat connector; and the double-connector assembly includes a double-connector, a sand-sinking tailpipe, and a lower connector. An annular sand-sinking channel is formed between the outer tube assembly, the pump barrel assembly, and the fixed valve assembly. Because the aforementioned existing long-plunger sand-sinking oil pump is designed with an annular sand-sinking channel, the sand extracted during production can enter the sand-sinking tailpipe connected to the double-connector through the sand-sinking channel and the double-connector. This provides advantages such as preventing sand jamming, sand burial, and sand abrasion, and is widely used in oil production operations in sand-bearing oil wells. When using a long plunger sand-filled oil pump, if pump inspection is required, the tubing is filled with well fluid. Every time a tubing is pulled out, a large amount of well fluid splashes everywhere. Some of the well fluid flows into the annulus, while most of it flows into the well site. This not only causes crude oil loss and increases treatment costs, but also pollutes the environment and makes the well site working environment harsh. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a drainable long plunger sand-proof oil pump that can achieve communication between the rod tube annulus and the oil sleeve annulus during pump inspection operations, and thus will not cause ground pollution when the oil pipe is pulled out.

[0005] To solve the above-mentioned technical problems, this utility model provides a drainable long plunger sand-prevention oil pump, comprising a pump barrel assembly, a plunger assembly, an outer pipe assembly, a fixed valve assembly, and a double-port assembly. The pump barrel assembly includes a pump barrel and an extension pipe; the plunger assembly includes a plunger; the outer pipe assembly includes an outer pipe and an upper connector; the fixed valve assembly includes an upper fixed valve cover and a lower fixed valve seat connector; and the double-port assembly includes a double-port connector, a sand-prevention tailpipe, and a lower connector. The head, wherein an annular sand settling channel is formed between the outer tube assembly, the pump cylinder assembly, and the fixed valve assembly, characterized in that: it also includes a tubular valve body, the outer walls of both ends of the tubular valve body are respectively connected to the outer tube, and the inner walls of both ends are respectively connected to the extension tube and the upper fixed valve cover, the tubular valve body is equipped with a valve core, and the valve bodies on both sides of the valve core are also provided with sand settling connection channels that communicate with the annular sand settling channel, so that when the valve core is broken, the rod tube annulus and the oil sleeve annulus can be connected.

[0006] As an improvement of this utility model, the tubular valve body has a stepped hole on its valve body wall, and the valve core is screwed into the stepped hole. The valve core and the stepped hole are sealed together. A blind hole with the open end facing outward is drilled inside the valve core. A circumferential groove is machined on the outer wall of the valve core. When the valve core breaks at the groove, the rod tube annulus and the oil sleeve annulus can be connected. It also includes a tubular guide sleeve. The inner wall of the tubular valve body is screwed onto the outer wall of one end of the guide sleeve. The other end of the guide sleeve is screwed onto the inner wall of the extension tube. The guide sleeve near the extension tube end has a cylindrical liquid passage hole. The guide sleeve near the tubular valve body end has a cylindrical guide hole. The inner diameter of the liquid passage hole is larger than the inner diameter of the guide hole. A tapered guide surface is machined between the liquid passage hole and the guide hole. The guide sleeve located on the outer circumference of the guide hole also has evenly distributed flow guide holes.

[0007] The drainable long plunger sand-control oil pump with the above-mentioned structure allows for pump inspection. First, the sucker rod and the plunger assembly connected to it are removed. Then, a special impact rod is inserted from the pump inlet. When the impact rod reaches the pump assembly and contacts the valve core, the valve core can break through the groove under the impact force of the falling impact rod. At this time, the rod tube annulus and the casing annulus are connected, and the well fluid in the tubing flows into the casing annulus and drains into the well, preventing it from being carried to the surface, thus achieving the purpose of clean production. In this utility model, after the guide sleeve is provided, the impact rod can accurately strike the valve core after passing through the conical guide surface and cylindrical guide hole inside the guide sleeve, improving the reliability of valve core breakage. Attached Figure Description

[0008] The present invention will now be described in further detail with reference to the accompanying drawings.

[0009] Figure 1 This is a cross-sectional structural schematic diagram of a drainable long plunger sand-prevention oil pump according to the present invention.

[0010] Figure 2 For easier viewing Figure 1 The angles of the structure at various points, along Figure 1 ZhongXX, YY line Figure 1 The diagram shows the structure of a drainable long plunger sand-prevention oil pump broken into three parts.

[0011] Figure 3 It is along Figure 2 Enlarged cross-sectional view of line AA in the middle.

[0012] Figure 4 It is along Figure 3 Schematic diagram of the cross-sectional structure of the middle BB line.

[0013] Figure 5 This is a schematic diagram of the valve core in this utility model.

[0014] Figure 6 yes Figure 2 Enlarged schematic diagram of the structure at point I. Detailed Implementation

[0015] See Figure 1 - Figure 6This utility model discloses a drainable long plunger sand-prevention oil pump, comprising a pump barrel assembly 1, a plunger assembly 2, an outer pipe assembly 3, a fixed valve assembly 4, and a double-port assembly 5. The pump barrel assembly 1 includes a pump barrel 101 and an extension pipe 102. The plunger assembly 2 includes a plunger 201. The outer pipe assembly 3 includes an outer pipe 301 and an upper connector 302. The fixed valve assembly 4 includes an upper fixed valve cover 401 and a lower fixed valve seat connector 402. The double-port assembly 5 includes a double-port connector 501, a sand-prevention tailpipe 502, and... The lower connector 503 forms an annular sand settling channel 9 between the outer pipe assembly 3, the pump cylinder assembly 1, and the fixed valve assembly 4. It is characterized by further including a tubular valve body 6, with the outer walls at both ends connected to the outer pipe 301, and the inner walls at both ends connected to the extended pipe 102 and the upper fixed valve cover 401, respectively. A valve core 601 is installed inside the tubular valve body, and sand settling connection channels 602 communicating with the annular sand settling channel 9 are also provided on both sides of the valve core. When the valve core is broken, communication between the rod tube annulus and the oil sleeve annulus can be achieved. The tubular valve body 6 has a stepped hole 60 on its wall, and the valve core 601 is screwed into the stepped hole, forming a sealing fit between the valve core and the stepped hole. A blind hole 6010 with its open end facing outwards is drilled inside the valve core, and a circumferential groove 6011 is machined on the outer wall of the valve core. When the valve core breaks at the groove, communication between the rod tube annulus and the oil sleeve annulus can be achieved. The valve body also includes a tubular guide sleeve 603, the inner wall of which is screwed to the guide sleeve. On the outer wall of one end, the other end of the guide sleeve is screwed onto the inner wall of the extension tube 102. The guide sleeve near the extension tube end has a cylindrical liquid passage hole 6031, and the guide sleeve near the tubular valve body end has a cylindrical guide hole 6032. The inner diameter of the liquid passage hole is larger than the inner diameter of the guide hole. A tapered guide surface 6033 is machined between the liquid passage hole and the guide hole. Evenly spaced flow guide holes 6034 are also machined within the guide sleeve located on the outer circumference of the guide hole. The length of the pump barrel 101 is 900 mm, 1200 mm, 1500 mm, or 1800 mm; the length of the plunger 201 is 3000 mm to 9000 mm.

[0016] It is understood that the above specific description of the present utility model is only used to illustrate the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model. Any modifications or equivalent substitutions to the present utility model to achieve the same technical effect are within the protection scope of the present utility model.

Claims

1. A drainable long plunger sand-prevention oil pump, comprising a pump barrel assembly (1), a plunger assembly (2), an outer pipe assembly (3), a fixed valve assembly (4), and a double-connector assembly (5), wherein the pump barrel assembly (1) comprises a pump barrel (101) and an extension pipe (102), the plunger assembly (2) comprises a plunger (201), the outer pipe assembly (3) comprises an outer pipe (301) and an upper connector (302), the fixed valve assembly (4) comprises an upper fixed valve cover (401) and a lower fixed valve seat connector (402), and the double-connector assembly (5) comprises a double-connector (501), a sand-prevention tail pipe (502), and a lower connector (503), wherein an annular sand-prevention channel (9) is formed between the outer pipe assembly (3), the pump barrel assembly (1), and the fixed valve assembly (4), characterized in that: It also includes a tubular valve body (6), the outer walls of both ends of the tubular valve body are connected to the outer tube (301) respectively, and the inner walls of both ends are connected to the extension tube (102) and the upper fixed valve cover (401) respectively. The tubular valve body is equipped with a valve core (601), and the valve body on both sides of the valve core is also provided with a sand settling connection channel (602) connected to the annular sand settling channel (9). When the valve core is broken, the rod tube annulus and the oil sleeve annulus can be connected.

2. The drainable long plunger sand-prevention oil pump as described in claim 1, characterized in that: The tubular valve body (6) has a stepped hole (60) on its valve body wall. The valve core (601) is screwed into the stepped hole, and there is a sealing fit between the valve core and the stepped hole. A blind hole (6010) with the open end facing outward is drilled inside the valve core. A circumferential groove (6011) is machined on the outer wall of the valve core. When the valve core breaks at the groove, the rod tube annulus and the oil sleeve annulus can be connected. It also includes a tubular guide sleeve (603). The inner wall of the tubular valve body (6) is screwed into the guide sleeve. On the outer wall of one end of the guide sleeve, the other end of the guide sleeve is screwed onto the inner wall of the extension tube (102). The guide sleeve near the end of the extension tube has a cylindrical liquid passage hole (6031), and the guide sleeve near the end of the tubular valve body has a cylindrical guide hole (6032). The inner diameter of the liquid passage hole is larger than the inner diameter of the guide hole. A tapered guide surface (6033) is machined between the liquid passage hole and the guide hole. The guide sleeve located on the outer circumference of the guide hole also has flow guide holes (6034) evenly distributed at intervals.

3. The drainable long plunger sand-prevention oil pump as described in claim 1, characterized in that: The length of the pump barrel (101) is 900 mm, 1200 mm, 1500 mm or 1800 mm; the length of the plunger (201) is 3000 mm to 9000 mm.

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