Anti-blocking thick oil pump

Abstract

The utility model provides an anti-blocking thick oil pump which comprises a pump cylinder, the pump cylinder comprises a first pump cylinder section and a second pump cylinder section which are fixedly connected, and an oil pumping mechanism concentrically arranged in the pump cylinder, the oil pumping mechanism comprises a first plunger and a second plunger which are fixedly connected, a first protective sleeve is arranged outside the first plunger, and a second protective sleeve is arranged outside the second plunger. A second protective sleeve is arranged outside the second plunger; the first protective sleeve is connected with the first pump cylinder section in a sealed mode, and the second protective sleeve is connected with the second pump cylinder section in a sealed mode.

Description

Technical Field

[0001] The utility model relates to the field of heavy oil well mining equipment, in particular to an anti-sticking thick oil pump. Background Art

[0002] At present, Tahe Oilfield is an Ordovician fracture-cave carbonate reservoir with strong heterogeneity. Due to the heavy oil quality, the casing is mixed with thin oil to reduce viscosity. In order to effectively solve the problem of heavy oil return and inability to inject positively, a thickening pump is selected as the main method of rod pump production.

[0003] As nitrogen replacement of oil has become an important way to increase oilfield production, the existing thickening pump structure has certain inadaptability when switching to production after nitrogen injection. The main manifestation is that the plunger cannot be lowered smoothly after nitrogen injection. Since the plunger and the pump barrel are made of 13-molybdenum, it is difficult to unblock them after hard contact, which increases the risk of pump inspection and seriously affects production timeliness and oil production costs.

[0004] To this end, it is desirable in the art to provide an anti-stuck thickening pump to improve the ability to handle stuck conditions when the plunger is lowered after gas injection corrosion. Utility Model Content

[0005] The purpose of the utility model is to provide an anti-stuck thickening pump, which can effectively solve the problem of plunger sticking, and the device can reduce abnormal processing time, shorten the construction period, and is simple to operate and has a high safety factor, and has broad prospects for promotion and application.

[0006] According to the utility model, an anti-sticking thickening pump is provided, comprising a pump barrel, wherein the pump barrel comprises a first pump barrel section and a second pump barrel section which are fixedly connected, and

[0007] An oil pumping mechanism is concentrically arranged in the pump barrel, the oil pumping mechanism comprising a first plunger and a second plunger fixedly connected,

[0008] Among them, a first protective sleeve is provided outside the first plunger, and a second protective sleeve is provided outside the second plunger; the first protective sleeve forms a sealed connection with the first pump barrel section, and the second protective sleeve forms a sealed connection with the second pump barrel section.

[0009] In one embodiment, the maximum compression amount of the first protective cover and the second protective cover is four fifths of their thickness.

[0010] In one embodiment, the first protective cover has the same thickness as the second protective cover.

[0011] In one embodiment, the thickness of the first protective sleeve is one fifth to one sixth of the outer diameter of the first plunger; the thickness of the second protective sleeve is 0.15 to 0.3 times the outer diameter of the second plunger.

[0012] In one embodiment, the first protective cover and the second protective cover are both made of resin material; the first pump barrel section and the second pump barrel section are both made of 13-plated molybdenum material.

[0013] In one embodiment, the oil mechanism further comprises an oil outlet valve and an oil inlet valve which are arranged in the first plunger at intervals, and the oil outlet valve is located above the oil inlet valve.

[0014] In one embodiment, at least two oil inlet valves are arranged at intervals along the axial direction of the first plunger.

[0015] In one embodiment, a plurality of oil holes arranged at intervals and allowing oil to pass therethrough are provided along the circumference of the first plunger, and the oil holes are located between the oil outlet valve and the oil inlet valve.

[0016] In one embodiment, the first protective cover is located above the oil hole.

[0017] In one embodiment, a plurality of oil inlets spaced apart from each other are arranged along the circumference of the second pump barrel segment, and a through hole aligned with the oil inlets is provided on the second protective sleeve.

[0018] Compared with the prior art, the advantages of the utility model are:

[0019] Firstly, the utility model can effectively solve the problem of plunger getting stuck, that is, the plunger cannot be lowered into the pump barrel due to the influence of the gas injection corrosion structure during the mining process, resulting in the problem of being stuck and difficult to unstick. In addition, the device can reduce the abnormal processing time, shorten the construction period, and is easy to process and operate, with a high safety factor, and has broad prospects for promotion and application.

[0020] Secondly, compared with the prior art, the present invention can change the hard contact between the pump barrel and the plunger to soft contact. In other words, when the plunger is stuck, since the resin material is not as hard as the steel material, the first protective cover and the second protective cover will be squeezed and deformed during the process of forcibly pulling out the plunger, thereby allowing the plunger to move upward to achieve the purpose of forcibly unblocking.

[0021] Thirdly, when the utility model is forcibly unblocked, not only the diameter of the plunger does not change, but the protective sleeve can also be tightly attached to the outer wall of the plunger after being squeezed and deformed, thereby forming a comprehensive protection for the plunger to ensure that the plunger can be put into production again after the jam is released, so as to further ensure the pump efficiency during production.

[0022] In addition, the protective sleeve in the utility model is equivalent to being filled between the pump barrel and the plunger (the first plunger and the second plunger). Therefore, it not only does not affect the production work of the anti-sticking thickening pump and does not reduce the pump efficiency during production, but also can provide a good sealing effect between the pump barrel and the plunger. In this way, the abnormal handling time is reduced and the construction period is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings, in which:

[0024] Figure 1 The structure of the anti-sticking thickening pump according to the utility model is schematically shown;

[0025] Figure 2 for Figure 1 A partial view of

[0026] Figure 3 for Figure 2 Cross-sectional view at AA in the middle;

[0027] Figure 4 for Figure 2 Cross-sectional view at BB in the middle.

[0028] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0029] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0030] The utility model will be further described below in conjunction with the accompanying drawings.

[0031] like Figures 1-2 As shown, according to the utility model, the anti-stuck thickening pump 100 includes a pump barrel and an oil pumping mechanism concentrically arranged in the pump barrel. Preferably, the pump barrel includes a first pump barrel section 11 and a second pump barrel section 12 fixedly connected to each other, and the first pump barrel section 11 is above the second pump barrel section 12. Preferably, the oil pumping mechanism includes a first plunger 21 and a second plunger 22 fixedly connected to each other, and the first plunger 21 is above the second plunger 22.

[0032] In one embodiment of the present invention, Figures 1 to 4As shown, the anti-stuck thickening pump 100 further includes a protective sleeve. Preferably, there are two protective sleeves, which are respectively arranged between the first plunger 21 and the first pump barrel section 11 and between the second plunger 22 and the second pump barrel section 12. Therefore, when the plunger (the first plunger 21 and / or the second plunger 22) is stuck, the protective sleeve can be squeezed to deform, thereby forcibly pulling out the plunger to achieve the purpose of unblocking, and the content thereof is introduced below.

[0033] In one embodiment, Figure 2 and 3 As shown, the protective sleeve includes a first protective sleeve 31 configured as a hollow sleeve. Preferably, the first protective sleeve 31 is fixed on the outer wall of the first plunger 21, and the inner circumferential surface of the first protective sleeve 31 forms a sealed connection with the outer circumferential surface of the first pump barrel section 11.

[0034] In the present invention, since the outer circumferential surface of the first protective sleeve 31 is sealed with the inner circumferential surface of the first pump barrel section 11, a good sealing effect can be achieved. In this way, the efficiency and quality of oil extraction of the anti-sticking thickening pump 100 can be effectively improved.

[0035] In one embodiment, Figure 2 and 4 As shown, the protective sleeve further comprises a second protective sleeve 32 configured as a barrel structure. Preferably, the second protective sleeve 32 can be completely wrapped around the second plunger 22, and the inner circumferential surface of the second protective sleeve 32 forms a sealed connection with the outer circumferential surface of the second pump barrel section 12.

[0036] In the present invention, since the outer circumferential surface of the second protective sleeve 32 can form a sealed connection with the inner circumferential surface of the second pump barrel section 12, a good sealing effect can be achieved. In this way, the efficiency and quality of oil pumping of the anti-sticking thickening pump 100 can be effectively improved.

[0037] In addition, since the protective sleeve in the utility model is equivalent to filling between the pump barrel and the plunger (the first plunger 21 and the second plunger 22), it not only does not affect the production work of the anti-stuck thickening pump 100 and does not reduce the pump efficiency during production, but also can provide a good sealing effect between the pump barrel and the plunger.

[0038] In a specific embodiment of the present invention, the first protective cover 31 and the second protective cover 32 are both made of resin material, and both the first protective cover 31 and the second protective cover 32 have good deformation ability. Therefore, when the plunger is stuck, the protective cover can be deformed by squeezing to achieve the purpose of forcibly pulling out the plunger.

[0039] In the present invention, the first pump barrel section 11 and the second pump barrel section 12 are both made of 13-molded molybdenum material. Compared with the prior art, the present invention can change the hard contact between the pump barrel and the plunger to soft contact. In other words, when the plunger is stuck, since the resin material is not as hard as the steel material, the first protective cover 31 and the second protective cover 32 will be squeezed and deformed during the process of forcibly pulling out the plunger, thereby allowing the plunger to move upward to achieve the purpose of forcibly unblocking.

[0040] It is worth noting that, in the process of forcibly withdrawing the plunger, only the protective sleeve is compressed and the diameter of the plunger does not change. Therefore, the forcibly unstuck plunger can still be put into production again, thereby ensuring the pump efficiency during production.

[0041] In one embodiment, the thickness of the first protective cover 31 is consistent with that of the second protective cover 32. Therefore, the first protective cover 31 and the second protective cover 32 can be manufactured and produced uniformly, and only the required lengths need to be cut and the structural shapes of the first protective cover 31 and the second protective cover 32 need to be changed as required during installation.

[0042] In one embodiment, the maximum compression amount of the first protective cover 31 and the second protective cover 32 is four fifths of their thickness. Therefore, when the plunger is forcibly pulled out, the first protective cover 31 and the second protective cover 32 can be squeezed and deformed to a greater extent, thereby ensuring that the plunger can be smoothly pulled out.

[0043] In addition, after the protective sleeve is squeezed and deformed, it can fit tightly on the outer wall of the plunger, thereby forming comprehensive protection for the plunger to ensure that the plunger can be put into production again after being unstuck, so as to further ensure the pump efficiency during production.

[0044] Preferably, the first protective cover 31 is located above the first plunger 21 .

[0045] In one embodiment, the thickness of the first protective sleeve 31 is one fifth to one sixth of the outer diameter of the first plunger 21, and the thickness of the second protective sleeve 32 is 0.15 to 0.3 times the outer diameter of the second plunger 22. In this way, the plunger can be smoothly lifted out after the protective sleeve is squeezed and deformed.

[0046] The specific structure of the utility model is introduced below by taking the 70 / 44 plunger as an example: In this embodiment, the thickness of the first protective cover 31 and the second protective cover 32 need to be made into 10mm. In this embodiment, the size of the first plunger 21 needs to be made into 60mm, and the size of the second plunger 22 needs to be made into 34mm.

[0047] Therefore, after the first plunger 21 and the second plunger 22 are respectively installed with the first protective sleeve 31 and the second protective sleeve 32, the size requirement of the 70 / 44 plunger can be met. In this way, not only can the production requirements of the anti-stuck thickening pump 100 be met, but also when the plunger is stuck, the protective sleeve can be squeezed to deform, thereby forcibly pulling out the plunger to achieve the purpose of unstuck.

[0048] Moreover, in the process of forcibly withdrawing the plunger, not only does the diameter of the plunger not change, but the protective sleeve can also fit tightly on the outer wall of the plunger after being squeezed and deformed, thereby forming comprehensive protection for the plunger to ensure that the plunger can be put into production again after being unstuck, so as to further ensure the pump efficiency during production.

[0049] In one embodiment, Figure 1 and 2 As shown, a plurality of spaced oil inlets 121 are provided along the circumference of the second pump barrel section 12. In addition, a through hole (not shown in the drawings) aligned with the oil inlet 121 is provided on the second protective sleeve 32, so that during production operation, oil can enter the plunger through the through hole and the oil inlet 121 in sequence.

[0050] In one embodiment, Figure 1 and 2 As shown, the oil mechanism further includes an oil outlet valve 111 and an oil inlet valve 112 arranged at intervals in the first plunger 21. Preferably, the oil outlet valve 111 is located above the oil inlet valve 112. In the utility model, at least two oil inlet valves 112 arranged at intervals are provided along the axial direction of the first plunger 21. Therefore, through the matching relationship between the oil outlet valve 111 and the oil inlet valve 112, production operations can be carried out more easily.

[0051] In one embodiment, a plurality of oil holes 113 arranged at intervals and allowing oil to pass through are provided along the circumference of the first plunger 21. Preferably, the oil holes 113 are located between the oil outlet valve 111 and the oil inlet valve 112. Therefore, when pumping oil, the oil inlet valve 112 is opened and the oil outlet valve 111 is closed, and the oil enters the annulus between the pump barrel and the plunger through the oil holes 113; when discharging oil, the oil outlet valve 111 is opened and the oil inlet valve 112 is closed, and the oil flows back into the first plunger 21 through the oil holes 113 and is discharged upward.

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] Firstly, the utility model can effectively solve the problem of plunger getting stuck, that is, the plunger cannot be lowered into the pump barrel due to the influence of the gas injection corrosion structure during the mining process, resulting in the problem of being stuck and difficult to unstick. In addition, the device can reduce the abnormal processing time, shorten the construction period, and is easy to process and operate, with a high safety factor, and has broad prospects for promotion and application.

[0054] Secondly, compared with the prior art, the present invention can change the hard contact between the pump barrel and the plunger to soft contact. In other words, when the plunger is stuck, since the resin material is not as hard as the steel material, the first protective cover 31 and the second protective cover 32 will be squeezed and deformed during the process of forcibly pulling out the plunger, thereby allowing the plunger to move upward to achieve the purpose of forcibly unblocking.

[0055] Thirdly, when the utility model is forcibly unblocked, not only the diameter of the plunger does not change, but the protective sleeve can also be tightly attached to the outer wall of the plunger after being squeezed and deformed, thereby forming a comprehensive protection for the plunger to ensure that the plunger can be put into production again after the jam is released, so as to further ensure the pump efficiency during production.

[0056] In addition, the protective sleeve in the utility model is equivalent to being filled between the pump barrel and the plunger (the first plunger 21 and the second plunger 22), so it not only does not affect the production work of the anti-sticking thickening pump 100 and does not reduce the pump efficiency during production, but also can provide a good sealing effect between the pump barrel and the plunger, and in this way also reduces the abnormal processing time and shortens the construction period.

[0057] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0058] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements.

[0059] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] The above are only preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can easily make changes or modifications within the scope of the present invention, and such changes or modifications should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An anti-stuck thickening pump, characterized in that: include: A pump barrel, the pump barrel comprising a first pump barrel section (11) and a second pump barrel section (12) which are fixedly connected, and An oil pumping mechanism is concentrically arranged in the pump barrel, the oil pumping mechanism comprising a first plunger (21) and a second plunger (22) which are fixedly connected, A first protective sleeve (31) is provided outside the first plunger (21), and a second protective sleeve (32) is provided outside the second plunger (22); the first protective sleeve (31) forms a sealed connection with the first pump barrel section (11), and the second protective sleeve (32) forms a sealed connection with the second pump barrel section (12).

2. The anti-sticking pump according to claim 1, characterized in that: The maximum compression amount of the first protective cover (31) and the second protective cover (32) is four fifths of their own thickness.

3. The anti-sticking pump according to claim 2, characterized in that: The first protective cover (31) and the second protective cover (32) have the same thickness.

4. The anti-sticking pump according to claim 3, characterized in that: The thickness of the first protective sleeve (31) is one fifth to one sixth of the outer diameter of the first plunger (21); and the thickness of the second protective sleeve (32) is 0.15 to 0.3 times the outer diameter of the second plunger (22).

5. The anti-sticking pump according to claim 4, characterized in that: The first protective sleeve (31) and the second protective sleeve (32) are both made of resin material; the first pump barrel section (11) and the second pump barrel section (12) are both made of 13-plated molybdenum material.

6. The anti-sticking pump according to claim 5, characterized in that: The oil mechanism further comprises an oil outlet valve (111) and an oil inlet valve (112) which are arranged at intervals in the first plunger (21), and the oil outlet valve (111) is located above the oil inlet valve (112).

7. The anti-sticking pump according to claim 6, characterized in that: At least two oil inlet valves (112) are arranged at intervals along the axial direction of the first plunger (21).

8. The anti-sticking pump according to claim 7, characterized in that: A plurality of oil holes (113) are arranged at intervals along the circumference of the first plunger (21) and allow oil to pass through. The oil holes (113) are located between the oil outlet valve (111) and the oil inlet valve (112).

9. The anti-sticking pump according to claim 8, characterized in that: The first protective sleeve (31) is located above the oil hole (113).

10. The anti-sticking pump according to any one of claims 1 to 9, characterized in that: A plurality of spaced-apart oil inlets (121) are arranged along the circumference of the second pump barrel section (12), and a through hole aligned with the oil inlets (121) is provided on the second protective sleeve (32).

Images