Pressurized lifting column

Abstract

The embodiment of the present application discloses a booster lifting string, which includes: a lifting string body, the lifting string body includes an upper pump chamber and a lower pump chamber; a jet assembly, which is arranged in the lower pump chamber, and the output end of the jet assembly faces the upper pump chamber; a channel, which connects the upper pump chamber and the input end of the jet assembly. Part of the liquid in the upper pump chamber of the booster lifting string will be transported to the jet assembly via a pipeline, and this part of the liquid will be pressurized by the jet assembly. The pressurized liquid is mixed with the bottom hole liquid and sucked into the lower pump chamber, which increases the suction pressure of the lower pump chamber, can effectively reduce the suspension point load and improve the overall pump efficiency of the lifting system.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of oil reservoir exploitation, and in particular to a pressurized lifting string. Background Art

[0002] In the field of oil reservoir exploitation technology, as the development of thin oil blocks in oil fields enters the middle and late stages, the formation energy deficit is serious, conventional water drive oil production can no longer make up for the formation energy loss, the oil wells have poor fluid supply capacity, and the number of low liquid level oil wells is increasing year by year, which puts higher requirements on the oil well lifting technology in terms of improving production pump efficiency and increasing system efficiency.

[0003] Among the ground lifting equipment currently in operation in oil fields, pumping units are still irreplaceable. In actual production in oil fields, due to the continuous decrease in the dynamic liquid level of oil wells, the site usually adopts a lifting plan to further increase the depth of the pump to obtain sufficient well submergence. However, in actual field, most pumping units cannot provide higher lifting force. In addition, increasing the submergence will increase the length of the sucker rod column, increase the deformation of the rod column, increase the load on the bare rod, and increase the stroke loss, which will affect the pump efficiency. In this way, more and more thin oil wells in low-porosity and low-permeability blocks gradually lose their production capacity as the liquid level decreases, resulting in well closure and suspension of production, which seriously affects the implementation of the overall development plan of the oil field.

[0004] Taking Liaohe Oilfield as an example, the geological structure of the Liaohe Oilfield reservoir is characterized by many faults and blocks. The reservoir thickness at the edge of the reservoir is small and the distribution is unstable. Among them, the thin oil reservoir is mainly low-porosity and low-permeability, and the general reservoir permeability is <50md, the porosity is <10%, and the reservoir fluid seepage resistance is large. Therefore, the exploitation of low-porosity and low-permeability thin oil blocks is usually accompanied by large fluctuations in bottom hole flow pressure and insufficient submergence, resulting in low oil well lifting pump efficiency (<30%), low system efficiency (<20%) and other lifting technical difficulties. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] In view of this, an embodiment of the present application proposes a pressurized lifting column, comprising:

[0007] A lifting column body, the lifting column body comprising an upper pump chamber and a lower pump chamber;

[0008] A jet assembly is disposed in the lower chamber of the pump, and an output end of the jet assembly faces the upper chamber of the pump;

[0009] A channel is connected to the upper chamber of the pump and the input end of the jet assembly.

[0010] In a feasible embodiment, the lifting column body comprises:

[0011] Sand settling outer tube;

[0012] The pump barrel is arranged in the sand settling outer tube.

[0013] In a feasible implementation manner, the lifting column body further includes:

[0014] a plunger assembly, a portion of which is disposed within the pump barrel;

[0015] The first movable valve is arranged on a side of the pump barrel away from the plunger assembly, and the area in the sand settling outer tube where the first movable valve and the plunger assembly are located is the upper pump chamber.

[0016] In a feasible implementation manner, the pressurized lifting column further comprises:

[0017] The centralizer is arranged between the pump barrel and the sand settling outer tube.

[0018] In a feasible implementation manner, the pressurized lifting column further comprises:

[0019] The pump barrel is made of steel, and a coating is arranged on the surface of the pump barrel, wherein the coating is made of chromium.

[0020] In a feasible implementation manner, the lifting column body further includes:

[0021] A fixed valve is arranged in the sand settling outer pipe;

[0022] In a feasible implementation manner, the lifting column body further includes:

[0023] a sand control screen connected to the fixed valve;

[0024] The sand settling cylinder is arranged in the sand control screen pipe and connected to the fixed valve. The area where the fixed valve and the sand settling cylinder are located is the lower chamber of the pump.

[0025] In a feasible implementation manner, the lifting column body further includes:

[0026] The second movable valve is arranged at one end of the plunger assembly away from the first movable valve.

[0027] In a feasible embodiment, the jet assembly includes:

[0028] a diffusion pipe connected to the fixed valve;

[0029] A throat pipe, one end of which is connected to the diffuser pipe;

[0030] A nozzle, one end of which is connected to the other end of the throat pipe, a channel is formed between the sand settling outer tube and the pump barrel, and the channel is connected to the nozzle;

[0031] A liquid inlet valve, arranged at one end of the nozzle away from the diffusion tube;

[0032] Wherein, when the lifting tube column body is in an upward stroke, the first movable valve and the second movable valve are closed, the liquid inlet valve and the fixed valve are opened, part of the liquid in the upper chamber of the pump is output through the lifting tube column body, and another part of the liquid is transported to the nozzle through the channel, and the lower chamber of the pump absorbs the liquid; when the lifting tube column body is in a downward stroke, the first movable valve and the second movable valve are opened, the liquid inlet valve and the fixed valve are closed, and the liquid in the lower chamber of the pump is transported to the upper chamber of the pump.

[0033] In a feasible embodiment, the jet assembly includes:

[0034] A sealing member, arranged at the connection between the throat pipe and the diffuser pipe;

[0035] An upper nozzle is sleeved on the outer side of the nozzle;

[0036] An upper nozzle connected to the nozzle, a portion of the upper nozzle being located inside the upper nozzle;

[0037] The nozzle sleeve is sleeved on the outer side of the upper nozzle.

[0038] In a feasible embodiment, the jet assembly further includes:

[0039] A liquid inlet joint has one end connected to the nozzle sleeve and the other end connected to the liquid inlet valve, and the liquid inlet joint is in communication with the channel.

[0040] In a feasible implementation manner, a gap is left between the nozzle and the throat, and the length of the gap is 0.5 to 1.5 times the diameter of the nozzle;

[0041] The diffusion pipe is a three-level diffusion structure.

[0042] In one possible embodiment, the diameter of the nozzle is determined based on the expected amount of liquid supplied by the channel to the jet assembly.

[0043] In a feasible embodiment, the diameter of the nozzle is determined based on the following formula:

[0044] Q=0.5*2.1*d 2 * (p1-p3) ½

[0045] Among them, Q is the nozzle injection flow rate; d is the nozzle diameter, p1 is the upper liquid column pressure; p3 is the bottom hole flow pressure.

[0046] In a feasible implementation manner, the area ratio of the nozzle to the throat of the jet assembly is determined based on the diameter of the nozzle and the characteristic curve of the jet pump.

[0047] Compared with the prior art, the present invention at least includes the following beneficial effects: in the actual use process of the booster lift string provided by the embodiment of the present application, when the booster lift string is in the upstroke, the liquid in the upper chamber of the pump is lifted by the lift string body, and the pumping unit can extract the liquid in the upper chamber of the pump from the booster lift string, and part of the liquid in the upper chamber of the pump will be transported to the jet assembly via the pipeline, and this part of the liquid will be pressurized by the jet assembly, and the pressurized liquid will be mixed with the bottom hole liquid and sucked into the lower chamber of the pump, thereby increasing the suction pressure of the lower chamber of the pump, thereby increasing the adsorption amount of the liquid in the lower chamber of the pump, which can effectively reduce the hanging point load and improve the overall pump efficiency of the lifting system. When the booster lift string is in the downstroke, the liquid in the lower chamber of the pump will enter the upper chamber of the pump, and as the booster lift string circulates between the upstroke and the downstroke, the bottom hole liquid can be pumped to the well to complete the exploitation of the oil reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0049] Figure 1 A schematic structural diagram of a pressurized lifting column according to an embodiment of the present application;

[0050] Figure 2 A schematic structural diagram of a fluidic assembly of a pressurized lifting column according to an embodiment of the present application.

[0051] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and the component names is as follows:

[0052] 1 lifting column body, 2 jet assembly, 3 channel;

[0053] 101 sand settling outer tube, 102 pump barrel, 103 plunger assembly, 104 first movable valve, 105 fixed valve, 106 sand control screen pipe, 107 sand settling cylinder, 108 second movable valve, 201 diffuser, 202 throat, 203 nozzle, 204 liquid inlet valve, 205 sealing element, 206 upper nozzle, 207 upper section nozzle, 208 nozzle sleeve, 209 liquid inlet joint. DETAILED DESCRIPTION

[0054] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0055] like Figure 1 and Figure 2 As shown, an embodiment of the present application proposes a pressurized lifting column, comprising: a lifting column body 1, the lifting column body 1 includes an upper pump chamber and a lower pump chamber; a jet component 2, arranged in the lower pump chamber, and the output end of the jet component 2 faces the upper pump chamber; a channel 3, connected to the upper pump chamber and the input end of the jet component 2.

[0056] In actual use of the booster lift string provided in the embodiment of the present application, when the booster lift string is in the upstroke, the liquid in the upper chamber of the pump is lifted by the lift string body 1, and the pumping unit can extract the liquid in the upper chamber of the pump from the booster lift string, and part of the high-pressure liquid in the upper chamber of the pump will be transported to the jet assembly 2 via the pipeline. This part of the high-pressure liquid will be pressurized by the jet assembly 2, and the pressurized liquid will be mixed with the bottom hole liquid and sucked into the lower chamber of the pump, thereby increasing the suction pressure of the lower chamber of the pump, thereby increasing the adsorption amount of the liquid in the lower chamber of the pump, which can effectively reduce the hanging point load and improve the overall pump efficiency of the lifting system. When the booster lift string is in the downstroke, the liquid in the lower chamber of the pump will enter the upper chamber of the pump, and as the booster lift string circulates between the upstroke and the downstroke, the bottom hole liquid can be pumped to the well to complete the exploitation of the oil reservoir.

[0057] like Figure 1 As shown, in some examples, the lifting column body 1 includes: a sand settling outer tube 101; a pump barrel 102, which is arranged in the sand settling outer tube 101; a plunger assembly 103, and part of the plunger assembly 103 is arranged in the pump barrel 102; a first movable valve 104, which is arranged on a side of the pump barrel 102 away from the plunger assembly 103, and the area in the sand settling outer tube 101 where the first movable valve 104 and the plunger assembly 103 are located is the upper pump chamber.

[0058] The lifting column body 1 includes a sand settling outer tube 101, a pump barrel 102, a plunger assembly 103 and a first movable valve 104. When the lifting column body 1 is lifted, the lifting column moves toward the well as a whole. Due to the effect of inertia and resistance, the first movable valve 104 receives a force in the downhole direction, and the first movable valve 104 is in a closed state. In this case, the liquid in the upper chamber of the pump can be lifted, and the liquid in the upper chamber of the pump can be transported to the well by the reciprocating suction of the plunger assembly 103. Through the arrangement of the pump barrel 102 and the sand settling outer tube 101, a channel 3 can be formed between the pump barrel 102 and the sand settling outer tube 101. Part of the liquid in the upper chamber of the pump is transported to the jet assembly 2 through a pipeline to increase the bottom hole suction pressure. The pressurized liquid is mixed with the bottom hole liquid and sucked into the lower chamber of the pump, which increases the suction pressure of the lower chamber of the pump, thereby increasing the adsorption amount of the liquid in the lower chamber of the pump, which can effectively reduce the suspension point load and improve the overall pump efficiency of the lifting system.

[0059] When the lifting string body 1 is in a downward stroke, the first movable valve 104 is subjected to a force in the uphole direction, the first movable valve 104 is in an open state, and the liquid in the lower chamber of the pump can enter the upper chamber of the pump.

[0060] In some examples, the base material of the sand settling outer tube is 45# steel with a base thickness of 6-6.5 mm, the base material of the pump barrel 102 is 45# steel, and the inner working surface is treated by chrome plating with a chrome plating layer thickness of 0.09-0.11 mm.

[0061] In some examples, the oil pump assembly adopts a sand-carrying structure design with a long plunger and a short pump barrel 102. For the lifting of thin oil wells, in order to ensure the effective sealing between the pump barrel 102 and the plunger in the working state, the plunger sealing section length is designed to be 1500mm, which can meet the gap sealing requirements between the pump barrel 102 and the plunger assembly 103.

[0062] In some examples, the booster lifting column further includes: a centralizer, which is disposed between the pump barrel 102 and the sand settling outer tube 101; the pump barrel 102 is made of steel, and a coating is disposed on the surface of the pump barrel 102, and the coating is made of chrome.

[0063] The booster lifting column also includes: a stabilizer, through the setting of the stabilizer, the concentricity effect of the pump barrel 102 and the sand settling outer tube 101 is better, and the centralizer is set between the sand settling outer tube and the pump barrel 102 to ensure the stability of the annular space. The pump barrel 102 is made of steel, and the surface of the pump barrel 102 is provided with a coating to improve the service life and corrosion resistance of the pump barrel 102.

[0064] like Figure 1As shown, in some examples, the lifting column body 1 also includes: a fixed valve 105, which is arranged in the sand settling outer tube 101; a sand control screen 106, which is connected to the fixed valve 105; a sand settling cylinder 107, which is arranged in the sand control screen 106 and connected to the fixed valve 105, and the area where the fixed valve 105 and the sand settling cylinder 107 are located is the pump lower chamber.

[0065] The lifting column body 1 also includes a fixed valve 105, a sand screen 106 and a sand settling cylinder 107. When the boosting lifting column is in the upstroke, the first movable valve 104 is in a closed state. As the pump upper chamber assembly moves, the space of the pump lower chamber will gradually increase. In this case, the fixed valve 105 will be in an open state, and part of the liquid in the pump upper chamber will be transported to the jet assembly 2. After the liquid passes through the jet assembly 2, the suction pressure of the pump lower chamber will increase. Under the action of the pressure difference, more liquid will be sucked into the pump lower chamber. When the boosting lifting column is in the downstroke, as the assembly in the pump upper chamber moves, the space of the lower chamber is compressed, the first movable valve 104 is in an open state, the fixed valve 105 is in a closed state, and the liquid in the lower chamber will enter the upper chamber.

[0066] Considering that the nozzle 203 of the jet assembly 2 is easily clogged, a sand settling channel can be formed by providing the sand prevention screen 106 and the sand settling cylinder 107, so that the sand in the chamber below the pump can be discharged, thereby reducing the probability of the nozzle 203 being clogged.

[0067] In some examples, the valve ball and valve seat of the fixed valve 105 are made of tungsten carbide hard alloy to improve the fluid erosion resistance of the fixed valve 105 assembly.

[0068] like Figure 1 As shown, in some examples, the lifting column body 1 further includes: a second movable valve 108 , which is disposed at an end of the plunger assembly 103 away from the first movable valve 104 .

[0069] The lifting string body 1 also includes a second movable valve 108. When the boosting lifting string is in the upstroke, the first movable valve 104 and the second movable valve 108 are both subjected to a force in the downhole direction, and the first movable valve 104 and the second movable valve 108 are both in a closed state. In this case, the liquid in the upper chamber of the pump can be pumped out by reciprocating suction of the plunger assembly 103. When the boosting lifting string is in the downstroke, the first movable valve 104 and the second movable valve 108 are both in an open state, and the liquid in the lower chamber of the pump enters the upper chamber of the pump.

[0070] like Figure 2As shown, in some examples, the jet assembly 2 includes: a diffuser 201 connected to the fixed valve 105; a throat 202, one end of which is connected to the diffuser 201; a nozzle 203, one end of which is connected to the other end of the throat 202, a channel 3 is formed between the sand settling outer tube 101 and the pump barrel 102, and the channel 3 is connected to the nozzle 203; a liquid inlet valve 204 is arranged at one end of the nozzle 203 away from the diffuser 201; wherein, in the lifting column body 1 When in the upstroke, the first movable valve 104 and the second movable valve 108 are closed, the liquid inlet valve 204 and the fixed valve 105 are opened, part of the liquid in the upper chamber of the pump is output through the lifting column body 1, and the other part of the liquid is transported to the nozzle 203 through the channel 3, and the lower chamber of the pump absorbs the liquid; when the lifting column body 1 is in the downstroke, the first movable valve 104 and the second movable valve 108 are opened, the liquid inlet valve 204 and the fixed valve 105 are closed, and the liquid in the lower chamber of the pump is transported to the upper chamber of the delivery pump.

[0071] The liquid is sprayed through the jet assembly 2 to form negative pressure to absorb low-pressure formation fluid, and the potential energy is exchanged in the throat pipe 202 to increase the pressure, thereby increasing the suction pressure of the lower chamber of the pump, thereby increasing the liquid adsorption capacity of the entire lifting string.

[0072] When the lifting string body 1 is in an upward stroke, the first movable valve 104 and the second movable valve 108 are closed, the liquid inlet valve 204 and the fixed valve 105 are opened, part of the liquid in the upper chamber of the pump is output through the lifting string body 1, and the other part of the liquid is transported to the nozzle 203 through the channel 3. After the liquid enters the nozzle 203, it passes through the throat 202 and the diffuser 201 in turn, and is finally discharged through the diffuser 201, thereby pressurizing the liquid. The pressurized liquid can be mixed with the liquid downhole to increase the pressure of the downhole liquid, thereby allowing the lower chamber of the pump to absorb more liquid, so that the pressurized lifting string can output more liquid under the same formation conditions; when the lifting string body 1 is in a downward stroke, the first movable valve 104 and the second movable valve 108 are opened, the liquid inlet valve 204 and the fixed valve 105 are closed, and the liquid in the lower chamber of the pump is transported to the upper chamber of the delivery pump.

[0073] like Figure 2 As shown, in some examples, the jet assembly 2 includes: a seal 205, which is arranged at the connection between the throat 202 and the diffuser 201; an upper nozzle 206, which is sleeved on the outside of the nozzle 203; an upper nozzle 207, which is connected to the nozzle 203, and a part of the upper nozzle 207 is on the inner side of the upper nozzle 206; a nozzle sleeve 208, which is sleeved on the outside of the upper nozzle 206; a liquid inlet connector 209, one end of which is connected to the nozzle sleeve 208, and the other end is connected to the liquid inlet valve 204, and the liquid inlet connector 209 is connected to the channel 3.

[0074] The jet assembly 2 includes a seal 205, an upper nozzle 206, an upper nozzle 207 and a nozzle sleeve 208. The seal 205 can be provided to seal the connection between the diffuser 201 and the throat 202, thereby avoiding leakage of the liquid and ensuring the pressurization effect. The upper nozzle 206, the upper nozzle 207 and the nozzle sleeve 208 can be used to fix the nozzle 203, so that the nozzle 203 can be miniaturized, which is beneficial to the preparation of the nozzle 203. Considering that the wear of the nozzle 203 is the most severe in the actual production process, the design of fixing the nozzle 203 by the upper nozzle 206, the upper nozzle 207 and the nozzle sleeve 208 reduces the volume of the nozzle 203, and the nozzle 203 can be made of relatively expensive diamond, and the upper nozzle 206, the upper nozzle 207 and the nozzle sleeve 208 can be made of relatively low-priced wear-resistant materials. Such a setting can reduce the cost of the booster lifting column while ensuring the service life of the booster lifting column.

[0075] In some examples, the nozzle 203 is made of polycrystalline diamond material, and the throat 202 is made of corrosion-resistant cemented carbide material to ensure the erosion resistance of the nozzle 203 and the throat 202, and to avoid brittle damage such as wear and fracture of the jet valve assembly system under long-term high-pressure jet working conditions. According to the design characteristics of the jet boosting technology, the jet valve assembly only works during the upstroke. Since the working flow of the jet valve assembly is the leakage on the pump, based on the jet pump design standard, in principle, the smaller the diameter of the nozzle 203, the better.

[0076] In a feasible implementation manner, a gap is left between the nozzle 203 and the throat 202, and the length of the gap is 0.5 to 1.5 times the diameter of the nozzle 203; the diffuser 201 is a three-stage diffuser structure.

[0077] A gap is left between the nozzle 203 and the throat 202 , and the gap is 0.5 to 1.5 times of the diameter of the nozzle 203 , which can improve the pressurization effect of the jet assembly 2 .

[0078] The diffuser 201 is a three-stage diffuser structure, which can further ensure the pressurization effect of the jet component 2 on the liquid. In some examples, the diffuser 201 is a three-stage diffuser with angles of 2°, 4° and 13°. Such a setting can better ensure the pressurization effect of the jet component 2.

[0079] In some examples, the diameter of the nozzle 203 is determined based on the expected amount of liquid supplied by the channel 3 to the jet assembly 2 .

[0080] It is taken into consideration that the amount of liquid supplied to the jet assembly 2 through the upper chamber of the pump needs to be reasonably controlled. If the amount of liquid supplied is too much, too little liquid will be extracted by the booster lift column. Therefore, the diameter of the nozzle 203 is determined by the amount of liquid supplied to the jet assembly 2 through the channel 3, and then the amount of liquid supplied to the nozzle 203 by the upper chamber of the pump can be controlled. Such a setting can not only ensure the liquid output of the booster lift column, but also increase the suction pressure of the lower chamber of the pump, thereby increasing the suction amount of the lower chamber of the pump of the lift column.

[0081] In some examples, the diameter of the nozzle 203 is determined based on the following formula:

[0082] Q=0.5*2.1*d 2 * (p1-p3) ½

[0083] Wherein, Q is the injection flow rate of the nozzle 203; d is the diameter of the nozzle 203, p1 is the upper liquid column pressure; and p3 is the bottom hole flow pressure.

[0084] The diameter of the nozzle 203 can be calculated through the above formula, which is helpful for clarifying the selection of the nozzle 203 and controlling the amount of liquid supplied from the upper chamber of the pump to the nozzle 203. Such a setting can not only ensure the liquid output of the booster lifting column, but also increase the suction pressure of the lower chamber of the pump, thereby increasing the suction volume of the lower chamber of the pump of the lifting column.

[0085] In some examples, the area ratio of the nozzle 203 of the jet assembly 2 to the throat 202 is determined based on the diameter of the nozzle 203 and the jet pump characteristic curve.

[0086] After determining the diameter of the nozzle 203 of the jet assembly 2, the area ratio of the nozzle 203 and the throat 202 can be determined by the diameter of the nozzle 203 and the jet pump characteristic curve, thereby completing the specific selection of the jet assembly 2. Such a setting can not only ensure the liquid output of the booster lifting column, but also increase the suction pressure of the chamber below the pump, thereby increasing the suction volume of the chamber below the pump of the lifting column.

[0087] It is understandable that for conventional jet pumps, under the same Reynolds number, the typical value of the friction loss factor determined by Gosseliny and O'Brien is used to obtain the relationship between H - M and E - M when R takes different values:

[0088] M=q3 / q1 (1)

[0089] R=A j / A t (2)

[0090] H = (p2-p3) / (p1-p2) (3)

[0091] E=MH (4)

[0092] Where:

[0093] M is the dimensionless mass flow ratio; q3 is the formation fluid production, m 3 / d; q1 is the working jet flow rate of the upstroke nozzle 203, m 3 / d;

[0094] R is the area ratio of the nozzle 203 to the throat 202; A j is the nozzle 203 area, mm 2 ; A t is the area of ​​throat 202, mm 2 ;

[0095] H is the dimensionless head ratio; p1 is the upper liquid column pressure, MPa; p2 is the mixed liquid pressure in the diffuser 201, MPa; p3 is the bottom hole flow pressure, MPa;

[0096] E is the efficiency of the jet pump.

[0097] According to the jet pump characteristic curve, by designing a reasonable R value, the mixed pressure p2 can be calculated by formula 3.

[0098] The new suction pressure is: p2=(H*p1+p3) / (H+1)

[0099] Take the following as an example: the pump depth is 1600m, the submergence is 150m, a φ44 oil well pump is used, the stroke is 5m, the stroke is 4 times / min, the jet pump nozzle 203 has a diameter of d=1.2mm, and the area ratio R=0.132:

[0100] The theoretical injection flow rate of nozzle 203 per minute is q=0.5*2.1*d2*(p1-p3)½=5.7L / min;

[0101] If a normal pump is used for normal production, the suction port pressure p=1.5MPa;

[0102] Select the jet boosting and lifting technology. From the dimensionless curve of the jet pump, it can be concluded that the pressure head ratio H=0.14, then the suction port pressure p2=(H*p1+p3) / (H+1)=(0.14*16+1.5)÷(0.14+1)=3.28MPa;

[0103] Through simulation calculation by rod pump design software, the total pump efficiency of the system is increased from 33% to 62% with the suction port pressure of 1.5MPa and 3.28MPa, an increase of 29%. 变 =8.8L / min;

[0104] Total pump efficiency improvement = (q change - q) / Q theory = (8.8-5.7) ÷ 30.4 = 10.2%.

[0105] In summary, the booster lifting string provided by this embodiment can be applied to oil wells whose dynamometer diagrams show that the oil is not fully filled, and can be used to improve pump efficiency, reduce suspension point load, and improve physical efficiency without changing the pumping depth. It can be applied to intermittent wells or shut-down wells with a submergence of less than 100 meters, and can achieve the purpose of increasing the pumping depth without replacing the surface pumping unit lifting equipment, obtain reasonable production allocation, and activate continuous production of intermittent wells and shut-down wells.

[0106] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0108] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0109] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressurized lifting column, characterized in that: include: A lifting column body, the lifting column body comprising an upper pump chamber and a lower pump chamber; A jet assembly is disposed in the lower chamber of the pump, and an output end of the jet assembly faces the upper chamber of the pump; a channel connected to the upper chamber of the pump and the input end of the jet assembly; The lifting column body comprises: Sand settling outer tube; A pump barrel is arranged in the sand settling outer tube; The lifting column body also includes: a plunger assembly, a portion of which is disposed within the pump barrel; A first movable valve is arranged on a side of the pump barrel away from the plunger assembly, and the area in the sand settling outer tube where the first movable valve and the plunger assembly are located is the pump upper chamber; A fixed valve, arranged in the sand settling outer tube, between the jet assembly and the first movable valve; The second movable valve is arranged at one end of the plunger assembly away from the first movable valve.

2. The booster lift column according to claim 1, characterized in that: Also includes: The centralizer is arranged between the pump barrel and the sand settling outer tube.

3. The booster lift column according to claim 2, characterized in that: Also includes: The pump barrel is made of steel, and a coating is arranged on the surface of the pump barrel, wherein the coating is made of chromium.

4. The booster lift column according to claim 1, characterized in that: The lifting column body also includes: Sand control screens; The sand settling cylinder is arranged in the sand control screen pipe, and the area where the fixed valve and the sand settling cylinder are located is the lower chamber of the pump.

5. The pressurized lifting column according to claim 1, characterized in that: The jet assembly comprises: a diffusion pipe connected to the fixed valve; A throat pipe, one end of which is connected to the diffuser pipe; A nozzle, one end of which is connected to the other end of the throat pipe, a channel is formed between the sand settling outer tube and the pump barrel, and the channel is connected to the nozzle; A liquid inlet valve, arranged at one end of the nozzle away from the diffusion tube; Wherein, when the lifting tube column body is in an upward stroke, the first movable valve and the second movable valve are closed, the liquid inlet valve and the fixed valve are opened, part of the liquid in the upper chamber of the pump is output through the lifting tube column body, and another part of the liquid is transported to the nozzle through the channel, and the lower chamber of the pump absorbs the liquid; when the lifting tube column body is in a downward stroke, the first movable valve and the second movable valve are opened, the liquid inlet valve and the fixed valve are closed, and the liquid in the lower chamber of the pump is transported to the upper chamber of the pump.

6. The pressurized lifting column according to claim 5, characterized in that: The jet assembly comprises: A sealing member, arranged at the connection between the throat pipe and the diffuser pipe; An upper nozzle is sleeved on the outer side of the nozzle; An upper nozzle connected to the nozzle, a portion of the upper nozzle being located inside the upper nozzle; The nozzle sleeve is sleeved on the outer side of the upper nozzle.

7. The pressurized lifting column according to claim 6, characterized in that: The jet assembly also includes: A liquid inlet joint has one end connected to the nozzle sleeve and the other end connected to the liquid inlet valve, and the liquid inlet joint is in communication with the channel.

8. The pressurized lifting column according to claim 7, characterized in that: A gap is left between the nozzle and the throat, and the length of the gap is 0.5 to 1.5 times the diameter of the nozzle; The diffusion pipe is a three-level diffusion structure.

9. The booster lift column according to claim 5, characterized in that: The diameter of the nozzle is determined based on the expected amount of liquid that the passageway supplies to the fluidic assembly.

10. The pressurized lifting column according to claim 9, characterized in that: The diameter of the nozzle is determined based on the following formula: Q=0.5*2.1*d 2 *(p1-p3) ½ Among them, Q is the nozzle injection flow rate; d is the nozzle diameter, p1 is the upper liquid column pressure; p3 is the bottom hole flow pressure.

11. The pressurized lifting column according to claim 5, characterized in that: The area ratio of the nozzle to the throat of the jet assembly is determined based on the diameter of the nozzle and the jet pump characteristic curve.

Images