CN115680577B - Underground concentric tube hydraulic lifting pump - Google Patents

Abstract

The invention discloses an underground concentric tube hydraulic lifting pump which comprises a pressurizing mechanism, a connecting mechanism and a drainage mechanism. The pressurizing mechanism consists of a pressurizing nozzle, a pressurizing joint and the like; the connecting mechanism consists of a reflux joint, a reducing joint and the like; the drainage mechanism consists of a drainage spray head, a jet pipe and the like. The inner pipe, the outer pipe and the runner conversion joint at the top end of the pressurizing mechanism are respectively connected with the pipe column joint, and the pressurizing mechanism is connected with the drainage mechanism through the connecting mechanism. The invention adopts a multiple negative pressure absorption and jet lifting structure, and realizes pumping and lifting of returned liquid to different degrees by controlling the flow of power liquid; the annular return liquid migration speed and fluidity are improved, the rock debris deposition in the pipeline is reduced, and the phenomena of pump blocking and pipeline blocking are effectively prevented, so that the production operation efficiency and the safety are improved. The invention is suitable for the drainage-assisting operation of reverse circulation pressure-control drilling, oil extraction with high sand content, natural gas hydrate drilling and the like, and has the characteristics of simple structure, energy conservation, consumption reduction and high reliability.

Description

An underground concentric tube hydraulic lift pump

technical field

The invention belongs to the field of energy mining equipment, in particular to an underground concentric tube hydraulic lift pump.

Background technique

In recent years, due to the increasing demand for oil, natural gas and other resources in social production and life, the exploitation depth of oil and natural gas resources has continued to increase, the annular pressure in the downhole of land wells has increased with depth, and the development of deep water oil and gas and hydrates There is a narrow density window in the middle and shallow surface drilling, the formation is soft and easy to leak, and the pressure in the wellbore needs to be precisely regulated during the drilling process, otherwise it will easily lead to the instability of the wellbore, the occurrence of lost circulation accidents, and affect the drilling efficiency; currently, the configuration is often used Drilling fluid, the use of gas, gas inflation, foam and other methods to control the pressure of the wellbore fluid column, but these methods are difficult to implement, and each has a matching process requirement, and the applicability is poor; the existing patent CN 101725543 A proposes a An annular turbosuction pump, which drives the internal turbine to rotate through the drilling fluid, drives the outer turbine pump blades to rotate, and realizes the lifting of the drilling fluid, but the turbine blades are exposed outside, so that the tool cannot be used in most complex well sections. Very restrictive.

Horizontal wells and extended-reach wells are currently widely used in the fields of oil, natural gas, shale gas and gas hydrate production. However, cuttings produced during drilling and a large amount of sand and gravel brought out by oil and gas flow during production, cuttings or sand and gravel are easily deposited in horizontal wells, highly deviated wells, extended-reach wells, and complex structures under the action of gravity. In the downhole wall of the well, etc., in the daily drilling process, if the mixed slurry migration cannot be well realized and the flow rate of the annulus return liquid is increased, the accumulation of cuttings or sand will form a cuttings bed or sand settling, which will greatly affect the completion of drilling. Efficiency and safety of well operations. The existing patent CN 112482986 A proposes a downhole hydraulic lifting tool. The drilling fluid flowing in the drill pipe drives the rotation of the turbine power mechanism, and the rotor of the screw axial flow mechanism is driven to rotate through the turbine central shaft and the universal coupling mechanism, so as to realize the The lifting of drilling fluid in the annular space and the migration of cuttings in the annular space in the horizontal section have complex structures, low efficiency, low service life, and prone to pump jamming and pipeline blockage.

At the same time, through the investigation of various types of pumps that can be used for downhole lifting, it is found after analysis that none of them can meet the drainage operations such as reverse circulation controlled pressure drilling, high sand oil production, natural gas hydrate drilling and production, etc. There are still the following problems in the application process Many deficiencies, mainly as follows:

(1) The existing jet lift tools still have the problems of poor efficiency, low pump pressure, and small lift, which directly affect the production efficiency and production capacity.

(2) In the existing production process, electric drive pumps such as disc pumps, multi-stage centrifugal pumps and plunger pumps are used. These lift pumps need to be lowered to the seabed separately or attached to the lift string and need to be connected by cables. The process is complex and the workload is large.

(3) The structure of the existing turbine-type hydraulic lifting tools is complicated. Since the sand content of the mixed liquid is often high during the production process, it is very easy to cause pump jams and pipeline blockages, which will consume a lot of manpower and material resources for shutdown maintenance, resulting in major Economic losses.

Therefore, in order to meet the needs of concentric drill pipe reverse circulation pressure controlled drilling technology, concentric double-pipe sand discharge oil production technology, double-pipe natural gas hydrate drilling and production technology, etc., and solve the above-mentioned shortcomings of existing downhole lift pumps, it is urgently needed Invented a new type of downhole concentric tube hydraulic lift pump, which can improve the migration speed and fluidity of the return liquid in the annular space, reduce the deposition of debris in the pipeline, and effectively prevent the phenomenon of pump jamming and pipeline blockage, thereby improving production efficiency and safety.

Contents of the invention

(1) Solved technical problems

The purpose of the present invention is to overcome the deficiencies of the prior art and provide an underground concentric tube hydraulic lift pump. The present invention adopts the multi-stage jet lifting method combining the drainage mechanism and the pressurization mechanism, which solves the problem of low production efficiency and improves the production operation efficiency; the tool can be directly connected to the production pipe string and drilled with the pipe string, It solves the problem of complex layout process and heavy workload of the existing production lift pump; the invention adopts the principle of negative pressure absorption, and there is no moving component inside the downhole pipe string, which solves the problems of prone to pump stuck and pipeline blockage, and reduces the Downtime maintenance loss, improve service life and reliability.

(2) Technical solution

The object of the present invention is achieved through the following technical solutions: a downhole concentric tube hydraulic lift pump, characterized in that it consists of a booster mechanism, a connection mechanism and a drainage mechanism; wherein the booster mechanism consists of an outer tube A1, Inner tube B2, booster joint 3, upper drainage joint 4, booster nozzle 5, booster nozzle block 6, booster nozzle connection block 7, drainage tube 8, inner tube C9 and outer tube D10, the bottom of the outer tube A1 end and the top of the outer tube D10 are threaded, the bottom of the inner tube B2 is threaded with the top of the pressurized joint 3, and the upper drainage joint 4 is provided with bosses II401, bosses III402, bosses IV403, bosses V404, and return holes I405 , the flow hole I406 and the return hole II407, the bottom end of the booster joint 3 is connected with the boss II401 of the upper drainage joint 4 through threads, and the boss III402 of the upper drainage joint 4 is connected with the boss I1-1 of the outer pipe A1 through threads , the booster nozzle 5 is connected with the booster nozzle connection block 7 through threads, the booster nozzle block 6 and the booster nozzle connection block 7 are respectively connected with the boss IV 403 of the upper drainage joint 4 through threads, the top of the drainage pipe 8 and the inner tube The top of C9 is threadedly connected with the boss IV403 and boss V404 of the upper drainage joint 4 respectively; the connecting mechanism is composed of the upper diverter plate 11, the return joint 12 and the reducing joint 13, and the return joint 12 is provided with the boss VI1201 and the boss VII1202 , groove I 1203, boss VIII 1204, groove II 1205, return hole III 1206, return hole IV 1207 and flow hole II 1208, boss VI 1201, boss VII 1202, boss Ⅷ 1204 of the return joint 12 pass through the thread and the bottom of the outer tube D10 respectively , the bottom end of the inner tube C9 and the top end of the outer tube E14 are connected, and the upper diverter plate 11 and the reducing joint 13 are respectively connected with the groove I1203 and the groove II1205 of the return joint 12 through threads; the drainage mechanism is composed of the outer tube E14, the inner tube F15, The jet tube 16, the jet tube gasket 17, the lower drainage joint 18, the drainage nozzle 19, the drainage nozzle stopper 20, the drainage nozzle connection block 21, the inner tube G22, the outer tube H23, the lower diverter plate 24 and the flow channel conversion joint 25, The top of the inner pipe F15 is threadedly connected to the bottom of the reducing joint 13, and the lower drainage joint 18 is provided with bosses IX1801, bosses X1802, bosses XI1803, bosses XII1804, suction holes 1805, return holes V1806 and flow holes III1807 , the flow path conversion joint 25 is provided with bosses i2501, bosses II2502, bosses III2503 and flow holes IV2504, the bottom end of the outer tube E14, the bottom end of the inner tube F15, the top end of the outer tube H23, and the top end of the inner tube G22 respectively pass through threads and Boss Ⅸ1801, boss Ⅹ1802, boss Ⅺ1803, and boss Ⅻ1804 of lower drainage joint 18 are connected, jet tube 16 is fixed inside inner tube F15, jet tube gasket 17 is arranged between jet tube 16 and lower drainage joint 18, and drainage The nozzle 19 is connected to the drainage nozzle connection block 21 through threads, the drainage nozzle stopper 20 and the drainage nozzle connection block 21 are respectively connected to the boss Ⅻ1804 of the lower drainage joint 18 through threads, and the bottom end of the outer tube H23 and the lower diverter plate 24 are respectively connected through the threads. It is connected with the boss i2501 and the boss Ⅲ2503 of the channel changing joint 25.

The hydraulic lift pump with concentric tubes in the well is characterized in that: a throat channel 3-1 is arranged inside the booster joint 3, and the bottom end of the throat channel 3-1 is a mixing tube for power fluid Momentum is exchanged with the return liquid, and the top of the throat channel 3-1 is a diffusion tube, which decelerates and pressurizes the return liquid.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the two sides of the upper splitter plate 11 and the lower splitter plate 24 are respectively provided with a columnar separation layer I11-1 and a cylindrical separation layer II24-1, The equalizing power fluid plays the role of diversion; the middle is respectively provided with a conical diversion column I11-2 and a conical diversion column II24-2, which are respectively used for the power fluid to enter the drainage tube 8 and the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the inside of the inner tube F15 is provided with a baffle, which is used to limit the position of the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the upper drainage joint 4 is provided with return holes I 405 and flow holes I 406 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively. ; There is a return hole II 407 containing a throat channel in the middle, which is used to suck the return liquid from the return hole I 405 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the return joint 12 is provided with return holes IV 1207 and flow holes II 1208 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively; There is a return hole III 1206 in the middle, which is used for the circulation of the return liquid after passing through the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the lower drainage joint 18 is provided with suction holes 1805 uniformly distributed in the circumferential direction and flow holes III 1807 for sucking mixed slurry and power respectively. Liquid circulation; there is a return hole V1806 in the middle, which is used for the power fluid circulation after passing through the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the flow channel conversion joint 25 is provided with keyway type flow holes IV 2504 evenly distributed in the circumferential direction, for the power fluid to flow to the bottom pipe string.

A suction lifting method for an underground concentric tube hydraulic lift pump, characterized in that: when performing production operations, the working procedure is divided into the process of surface pumping, the process of power fluid injection, the process of moving down the power fluid, and the pumping of mixed slurry Suction process, return liquid pressurization process and return liquid lifting process, the steps are as follows:

S1. Surface pumping process: Connect the tool to the downhole device combination. The frequency conversion control cabinet on the ground can control the speed of the surface pump and the flow rate of the power fluid to adjust the output of the mixed slurry. After the power fluid is pressurized by the surface pump, it passes through the pipe The column reaches the annulus between the outer tube A1 and the inner tube B2;

S2. Power fluid injection process: The high-pressure power fluid enters the annulus between the drainage tube 8 and the inner tube C9 through the annular space between the outer tube A1 and the inner tube B2 through the flow hole I406, and then passes through the upper diverter plate 11, the upper The diverter plate 11 plays a role in diverting the power fluid, a part of the power fluid enters the drainage pipe 8, and the other part of the power fluid enters the annular space between the outer tube E14 and the inner tube F15 through the flow hole II1208, and then enters through the flow hole III1807 The annular space between the inner pipe G22 and the outer pipe H23;

S3. The process of moving the power fluid downward: the high-pressure power fluid passes through the annular space between the inner pipe G22 and the outer pipe H23, passes through the lower splitter plate 24, and the lower splitter plate 24 diverts the power fluid, and a part of the power fluid enters the lower part through the flow hole IV 2504 String;

S4. Suction process of mixed slurry: another part of the high-pressure power fluid diverted by the lower diverter plate 24 enters the inner pipe G22, and a negative pressure is generated at the nozzle of the drainage nozzle 19, and the mixed slurry is sucked into the jet tube 16 through the suction hole 1805, The power fluid is mixed with the mixed slurry to form the return liquid, which is decelerated and pressurized and then enters the inner pipe F15, and then the return liquid passes through the reducing joint 13 and the return hole IV1207 in turn, and then enters the annular space between the inner pipe C9 and the outer pipe D10;

S5. The pressurization process of the return liquid: a part of the high-pressure power liquid diverted by the upper diverter plate 11 enters the drainage pipe 8, and a negative pressure is generated at the nozzle of the pressurized nozzle 5, and the annular space between the inner pipe C9 and the outer pipe D10 returns The outlet liquid is sucked into the pressurization joint 3 through the return hole I405, and the return liquid and the power fluid are mixed together in the pressurization joint 3 and decelerated and pressurized before entering the inner pipe B2;

S6. Lifting process of the return liquid: Under the double negative pressure absorption effect of the pressurization mechanism and the drainage mechanism, the return liquid enters the upper pipe string through the inner pipe B2, migrates to the ground through the pipe string, and performs sand removal, oil, gas and liquid Separation and purification, reciprocating, to achieve high-efficiency production operations.

(3) Beneficial effects

The beneficial effects of the present invention are: (1) Adopting multiple negative pressure absorption and jet lift structure, the return fluid can be lifted quickly and the production operation efficiency is high; (2) It can be directly connected to the production string and the drill can be lowered along with the string (3) The fluidity of the annulus return liquid is high, the debris deposition in the pipeline is low and there are no moving parts inside, which can effectively prevent the phenomenon of pump jamming and pipeline blockage; (4) Through the control The power fluid flow can pump and lift the return fluid to different degrees, finely regulate the downhole pressure, and have high safety; (5) Wide application range, suitable for reverse circulation pressure controlled drilling, high sand content oil production, natural gas hydrate drilling and production Waiting for the arrangement operation.

Description of drawings

Fig. 1 is the front view sectional structure schematic diagram of the present invention;

Fig. 2 is a front view sectional structural schematic diagram of the present invention when power fluid is injected;

Fig. 3 is a schematic diagram of a three-dimensional cross-sectional structure of a supercharging mechanism of the present invention;

Fig. 4 is a schematic diagram of a three-dimensional cross-sectional structure of the drainage mechanism of the present invention;

Fig. 5 is a structural schematic diagram of the upper drainage joint of the present invention;

Fig. 6 is a schematic cross-sectional structure diagram of a return joint of the present invention;

Fig. 7 is a schematic cross-sectional structure diagram of the drainage joint of the present invention;

Fig. 8 is a schematic diagram of the structure of the channel changing joint of the present invention;

1. Outer pipe A; 2. Inner pipe B; 3. Booster connector; 4. Upper drainage connector; 5. Booster nozzle; 6. Booster nozzle block; 7. Booster nozzle connection block; 8. Drainage tube ;9, inner tube C; 10, outer tube D; 11, upper manifold; 12, return joint; 13, reducing joint; 14, outer tube E; 15, inner tube F; 16, jet tube; 17, jet Tube gasket; 18, lower drainage joint; 19, drainage nozzle; 20, drainage nozzle block; 21, drainage nozzle connection block; 22, inner pipe G; 23, outer pipe H; 24, lower diverter plate; 25, flow channel Conversion joint; 1-1, boss I; 3-1, throat channel; 11-1, cylindrical separation layer I; 11-2, conical diversion column I; 24-1, cylindrical separation layer II; 24-2, conical diversion column II; 401, boss II; 402, boss III; 403, boss IV; 404, boss V; 405, return hole I; 406, flow hole I; 407, Return hole II; 1201, boss VI; 1202, boss VII; 1203, groove I; 1204, boss VIII; 1205, groove II; 1206, return hole III; 1207, return hole IV; 1208, overcurrent Hole Ⅱ; 1801, boss IX; 1802, boss Ⅹ; 1803, boss Ⅺ; 1804, boss Ⅻ; 1805, suction hole; 1806, return hole Ⅴ; 1807, flow hole Ⅲ; 2501, boss ⅰ; 2502, boss ⅱ; 2503, boss Ⅲ; 2504, flow hole Ⅳ.

Implementation

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it needs to be explained that, belonging to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated direction or positional relationship is based on the direction or positional relationship described in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, belonging to "first" and "second" is only for descriptive purposes, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as there is no conflict with each other.

Example

The downhole concentric tube hydraulic lift pump described in this embodiment is used in a vertical well section.

As shown in the figure, an underground concentric tube hydraulic lift pump is composed of a booster mechanism, a connection mechanism and a drainage mechanism; wherein, the booster mechanism consists of an outer tube A1, an inner tube B2, a booster joint 3, and an upper drainage joint 4. The booster nozzle 5, the booster nozzle block 6, the booster nozzle connection block 7, the drainage tube 8, the inner tube C9 and the outer tube D10, the bottom of the outer tube A1 and the top of the outer tube D10 are connected by threads, and the inner tube The bottom end of B2 is threadedly connected to the top of booster joint 3, and the upper drainage joint 4 is provided with boss II 401, boss III 402, boss IV 403, boss V 404, return hole I 405, flow hole I 406 and return hole II 407, boosting The bottom end of the joint 3 is connected with the boss II401 of the upper drainage joint 4 through threads, the boss III402 of the upper drainage joint 4 is connected with the boss I1-1 of the outer pipe A1 through threads, and the booster nozzle 5 is connected with the booster nozzle through threads Block 7 is connected, booster nozzle block 6 and booster nozzle connection block 7 are respectively connected to the boss IV 403 of the upper drainage joint 4 through threads, and the top of the drainage pipe 8 and the top of the inner tube C9 are respectively connected to the boss IV 403 of the upper drainage joint 4 It is connected with the boss V404 by thread; the connecting mechanism is composed of the upper diverter plate 11, the return joint 12 and the reducing joint 13, and the return joint 12 is provided with the boss VI1201, the boss VII1202, the groove I1203, the boss VIII1204, the groove II1205 , backflow hole III1206, backflow hole IV1207 and overflow hole II1208, bosses VI1201, bosses VII1202, and bosses VIII1204 of the return joint 12 are respectively connected to the bottom end of the outer tube D10, the bottom end of the inner tube C9, and the top end of the outer tube E14 through threads , the upper splitter plate 11 and the reducing joint 13 are respectively threaded with the groove I1203 and the groove II1205 of the return joint 12; 18. The drainage nozzle 19, the drainage nozzle stopper 20, the drainage nozzle connection block 21, the inner pipe G22, the outer pipe H23, the lower diverter plate 24 and the flow channel conversion joint 25, the top of the inner pipe F15 and the bottom end of the reducing joint 13 pass through Threaded connection, the lower drainage joint 18 is provided with bosses IX1801, bosses X1802, bosses XI1803, bosses XII1804, suction holes 1805, return holes V1806 and flow holes III1807, and the channel change joint 25 is provided with bosses I2501, Boss ⅱ2502, boss Ⅲ2503 and flow hole Ⅳ2504, the bottom of outer tube E14, the bottom of inner tube F15, the top of outer tube H23, the top of inner tube G22 through thread and boss Ⅸ1801 and boss Ⅹ1802 of drain joint 18 respectively , boss Ⅺ1803, and boss Ⅻ1804 are connected, the jet tube 16 is fixed inside the inner tube F15, a jet tube gasket 17 is arranged between the jet tube 16 and the lower drainage joint 18, and the drainage nozzle 19 is connected to the drainage nozzle connection block 21 through threads, Drainage nozzle stopper 20 and drainage nozzle connection block 21 are respectively connected through thread and boss Ⅻ1804 of lower drainage joint 18, and the bottom end of outer pipe H23 and lower diverter plate 24 are respectively threaded and boss Ⅻ1801 and boss Ⅻ1801 of flow channel conversion joint 25. Taiwan III 2503 connection.

The hydraulic lift pump with concentric tubes in the well is characterized in that: a throat channel 3-1 is arranged inside the booster joint 3, and the bottom end of the throat channel 3-1 is a mixing tube for power fluid Momentum is exchanged with the return liquid, and the top of the throat channel 3-1 is a diffusion tube, which acts to decelerate and pressurize the return liquid, and is used to increase the pressure of the return liquid.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the two sides of the upper splitter plate 11 and the lower splitter plate 24 are respectively provided with a columnar separation layer I11-1 and a cylindrical separation layer II24-1, Both play the role of shunting the power fluid; in the middle, there are conical diversion column I11-2 and conical diversion column II24-2, which are respectively used for the power fluid to enter the drainage tube 8 and the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the inside of the inner tube F15 is provided with a baffle, which is used to limit the position of the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the upper drainage joint 4 is provided with return holes I 405 and flow holes I 406 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively. ; There is a return hole II 407 containing a throat channel in the middle, which is used to suck the return liquid from the return hole I 405 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the return joint 12 is provided with return holes IV 1207 and flow holes II 1208 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively; There is a return hole III 1206 in the middle, which is used for the circulation of the return liquid after passing through the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the lower drainage joint 18 is provided with suction holes 1805 uniformly distributed in the circumferential direction and flow holes III 1807 for sucking mixed slurry and power respectively. Liquid circulation; there is a return hole V1806 in the middle, which is used for the power fluid circulation after passing through the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the flow channel conversion joint 25 is provided with keyway type flow holes IV 2504 evenly distributed in the circumferential direction, for the power fluid to flow to the bottom pipe string.

The working process of the present invention is as follows: When used for concentric drill pipe reverse circulation pressure controlled drilling and concentric double pipe sand discharge oil production, the tool is connected to the downhole device combination of the drilling and completion system, and the frequency conversion control cabinet on the ground controls the speed of the surface pump , to control the flow rate of the power fluid and adjust the output of the mixed slurry. After the power fluid is pressurized by the surface pump, it passes through the pipe string to reach the annular space between the outer pipe A1 and the inner pipe B2. After entering the annular space between the drainage tube 8 and the inner tube C9 through the flow hole I406, the upper splitter plate 11 passes through the upper splitter plate 11, and the upper splitter plate 11 plays a role in diverting the power fluid, and a part of the power fluid enters the drainage tube 8 , a negative pressure is generated at the nozzle of the booster nozzle 5, and another part of the power fluid enters the annular space between the outer pipe E14 and the inner pipe F15 through the flow hole II1208, and then enters the space between the inner pipe G22 and the outer pipe H23 through the flow hole III1807 The annulus between the two passes through the lower splitter plate 24, and the lower splitter plate 24 splits the flow of the power fluid. A part of the power fluid enters the lower pipe string through the flow hole IV 2504, and the other part of the power fluid enters the inner pipe G22, and a negative flow is generated at the nozzle of the drainage nozzle 19. The mixed slurry is sucked into the jet pipe 16 through the suction hole 1805, and the power fluid and the mixed slurry are mixed to form a return liquid, which is decelerated and pressurized and then enters the inner pipe F15, and then the return liquid passes through the reducing joint 13 and the return hole in turn. After Ⅳ1207, it enters the annular space between the inner pipe C9 and the outer pipe D10, enters the return hole I405 and is sucked by the booster nozzle 5, and the power fluid and the return fluid are mixed together at the booster joint 3 and then decelerated and boosted to enter the inner tube B2 , the return fluid enters the upper pipe string, migrates to the ground through the pipe string, and performs sand removal, oil-gas-liquid separation and purification. Under the double negative pressure absorption of the booster mechanism and the drainage mechanism, the strong pumping of the mixed slurry is realized. At the same time, we can control the suction and lifting speed of the mixed slurry by controlling the flow rate of the pumped power fluid to achieve fine control of the environmental pressure.

Example

The downhole concentric tube hydraulic lift pump described in this embodiment is used in the horizontal section.

As shown in the figure, an underground concentric tube hydraulic lift pump is composed of a booster mechanism, a connection mechanism and a drainage mechanism; wherein, the booster mechanism consists of an outer tube A1, an inner tube B2, a booster joint 3, and an upper drainage joint 4. The booster nozzle 5, the booster nozzle block 6, the booster nozzle connection block 7, the drainage tube 8, the inner tube C9 and the outer tube D10, the bottom of the outer tube A1 and the top of the outer tube D10 are connected by threads, and the inner tube The bottom end of B2 is threadedly connected to the top of booster joint 3, and the upper drainage joint 4 is provided with boss II 401, boss III 402, boss IV 403, boss V 404, return hole I 405, flow hole I 406 and return hole II 407, boosting The bottom end of the joint 3 is connected with the boss II401 of the upper drainage joint 4 through threads, the boss III402 of the upper drainage joint 4 is connected with the boss I1-1 of the outer pipe A1 through threads, and the booster nozzle 5 is connected with the booster nozzle through threads Block 7 is connected, booster nozzle block 6 and booster nozzle connection block 7 are respectively connected to the boss IV 403 of the upper drainage joint 4 through threads, and the top of the drainage pipe 8 and the top of the inner tube C9 are respectively connected to the boss IV 403 of the upper drainage joint 4 It is connected with the boss V404 by thread; the connecting mechanism is composed of the upper diverter plate 11, the return joint 12 and the reducing joint 13, and the return joint 12 is provided with the boss VI1201, the boss VII1202, the groove I1203, the boss VIII1204, the groove II1205 , backflow hole III1206, backflow hole IV1207 and overflow hole II1208, bosses VI1201, bosses VII1202, and bosses VIII1204 of the return joint 12 are respectively connected to the bottom end of the outer tube D10, the bottom end of the inner tube C9, and the top end of the outer tube E14 through threads , the upper splitter plate 11 and the reducing joint 13 are respectively threaded with the groove I1203 and the groove II1205 of the return joint 12; 18. The drainage nozzle 19, the drainage nozzle stopper 20, the drainage nozzle connection block 21, the inner pipe G22, the outer pipe H23, the lower diverter plate 24 and the flow channel conversion joint 25, the top of the inner pipe F15 and the bottom end of the reducing joint 13 pass through Threaded connection, the lower drainage joint 18 is provided with bosses IX1801, bosses X1802, bosses XI1803, bosses XII1804, suction holes 1805, return holes V1806 and flow holes III1807, and the channel change joint 25 is provided with bosses I2501, Boss ⅱ2502, boss Ⅲ2503 and flow hole Ⅳ2504, the bottom of outer tube E14, the bottom of inner tube F15, the top of outer tube H23, the top of inner tube G22 through thread and boss Ⅸ1801 and boss Ⅹ1802 of drain joint 18 respectively , boss Ⅺ1803, and boss Ⅻ1804 are connected, the jet tube 16 is fixed inside the inner tube F15, a jet tube gasket 17 is arranged between the jet tube 16 and the lower drainage joint 18, and the drainage nozzle 19 is connected to the drainage nozzle connection block 21 through threads, Drainage nozzle stopper 20 and drainage nozzle connection block 21 are respectively connected through thread and boss Ⅻ1804 of lower drainage joint 18, and the bottom end of outer pipe H23 and lower diverter plate 24 are respectively threaded and boss Ⅻ1801 and boss Ⅻ1801 of flow channel conversion joint 25. Taiwan III 2503 connection.

The hydraulic lift pump with concentric tubes in the well is characterized in that: a throat channel 3-1 is arranged inside the booster joint 3, and the bottom end of the throat channel 3-1 is a mixing tube for power fluid Momentum is exchanged with the return liquid, and the top of the throat channel 3-1 is a diffusion tube, which acts to decelerate and pressurize the return liquid, and is used to increase the pressure of the return liquid.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the two sides of the upper splitter plate 11 and the lower splitter plate 24 are respectively provided with a columnar separation layer I11-1 and a cylindrical separation layer II24-1, Both play the role of shunting the power fluid; in the middle, there are conical diversion column I11-2 and conical diversion column II24-2, which are respectively used for the power fluid to enter the drainage tube 8 and the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the inside of the inner tube F15 is provided with a baffle, which is used to limit the position of the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the upper drainage joint 4 is provided with return holes I 405 and flow holes I 406 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively. ; There is a return hole II 407 containing a throat channel in the middle, which is used to suck the return liquid from the return hole I 405 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the return joint 12 is provided with return holes IV 1207 and flow holes II 1208 evenly distributed in the circumferential direction for the flow of return fluid and power fluid respectively; There is a return hole III 1206 in the middle, which is used for the circulation of the return liquid after passing through the jet tube 16 .

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the outer side of the lower drainage joint 18 is provided with suction holes 1805 uniformly distributed in the circumferential direction and flow holes III 1807 for sucking mixed slurry and power respectively. Liquid circulation; there is a return hole V1806 in the middle, which is used for the power fluid circulation after passing through the inner tube G22.

The above-mentioned downhole concentric tube hydraulic lift pump is characterized in that: the flow channel conversion joint 25 is provided with keyway type flow holes IV 2504 evenly distributed in the circumferential direction, for the power fluid to flow to the bottom pipe string.

The working process of the present invention is as follows: When used for double-tube natural gas hydrate drilling and production, one or more tools are connected to the downhole device combination in the horizontal well section at the same time, and the frequency conversion control cabinet on the ground controls the power by controlling the speed of the surface pump. The liquid flow rate can adjust the output of mixed slurry. After the power fluid is pressurized by the surface pump, it reaches the annular space between the outer pipe A1 and the inner pipe B2 through the pipe string. After entering the annular space between the drainage pipe 8 and the inner pipe C9 through the flow hole I406, it passes through the upper diverter plate 11, and the upper diverter plate 11 plays a role in diverting the power fluid, and a part of the power fluid enters the drainage pipe 8 and is Negative pressure is generated at the nozzle of pressure nozzle 5, and another part of the power fluid enters the annulus between the outer pipe E14 and the inner pipe F15 through the flow hole II1208, and then enters the annulus between the inner pipe G22 and the outer pipe H23 through the flow hole III1807. Empty, through the lower diverter plate 24, the lower diverter plate 24 splits the power fluid, a part of the power fluid enters the lower pipe column through the flow hole IV 2504, and the other part of the power fluid enters the inner pipe G22, and generates negative pressure at the nozzle of the drainage nozzle 19, mixing The slurry is sucked into the jet pipe 16 through the suction hole 1805, and the power fluid and the mixed slurry are mixed to form a return liquid, which is decelerated and pressurized and then enters the inner pipe F15, and then the return liquid enters through the reducing joint 13 and the return hole IV1207 in sequence The annular space between the inner pipe C9 and the outer pipe D10 enters the return hole I405 and is sucked by the booster nozzle 5. The power fluid and the return liquid are mixed together in the booster joint 3 and decelerated and boosted, then enter the inner tube B2, and return to the inner tube B2. The liquid enters the upper pipe string, and is transported to the mining platform at sea level for further processing through the pipe string. Under the double negative pressure absorption effect of the pressurization mechanism and the drainage mechanism, the high-efficiency mining of the mixed slurry is realized.

Apparently, the above-mentioned embodiment is only an example for clearly explaining, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above-mentioned description. . It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (8)

1. The hydraulic lifting pump for the underground concentric pipes is characterized by comprising a pressurizing mechanism, a connecting mechanism and a drainage mechanism; wherein the pressurizing mechanism consists of an outer pipe A (1), an inner pipe B (2), a pressurizing connector (3), an upper drainage connector (4), a pressurizing nozzle (5), a pressurizing nozzle stop block (6), a pressurizing nozzle connecting block (7), a drainage tube (8), an inner pipe C (9) and an outer pipe D (10), wherein the bottom end of the outer pipe A (1) is connected with the top end of the outer pipe D (10) through threads, the bottom end of the inner pipe B (2) is connected with the top end of the pressurizing connector (3) through threads, the upper drainage connector (4) is provided with a boss II (401), a boss III (402), a boss IV (403), a boss V (404), a backflow hole I (405), an overflow hole I (406) and a backflow hole II (407), the bottom end of the pressurizing connector (3) is connected with the boss II (401) of the upper drainage connector (4) through threads, the boss III (402) of the upper drainage connector (4) is connected with the boss I (1-1) of the outer pipe A (10) through threads, the pressurizing nozzle (5) is connected with the pressurizing nozzle stop block (6) and the pressurizing nozzle (7) through threads respectively connected with the boss IV (403) of the upper drainage connector (4) through threads, the top end of the drainage tube (8) and the top end of the inner tube C (9) are respectively connected with a boss IV (403) and a boss V (404) of the upper drainage joint (4) through threads; the connecting mechanism consists of an upper splitter plate (11), a reflux joint (12) and a reducer union (13), wherein the reflux joint (12) is provided with a boss VI (1201), a boss VII (1202), a groove I (1203), a boss VIII (1204), a groove II (1205), a reflux hole III (1206), a reflux Kong (1207) and a flow through hole II (1208), the boss VI (1201), the boss VII (1202) and the boss VIII (1204) of the reflux joint (12) are respectively connected with the bottom end of an outer pipe D (10), the bottom end of an inner pipe C (9) and the top end of an outer pipe E (14) through threads, and the upper splitter plate (11) and the reducer union (13) are respectively connected with the groove I (1203) and the groove II (1205) of the reflux joint (12) through threads; the drainage mechanism consists of an outer tube E (14), an inner tube F (15), a jet tube (16), a jet tube gasket (17), a lower drainage joint (18), a drainage nozzle (19), a drainage nozzle stop block (20), a drainage nozzle connecting block (21), an inner tube G (22), an outer tube H (23), a lower flow dividing plate (24) and a flow passage conversion joint (25), wherein the top end of the inner tube F (15) is in threaded connection with the bottom end of a reducer joint (13), the lower drainage joint (18) is provided with a boss IX (1801), a boss X (1802), a boss XI (1803), a boss XII (1804), a suction hole (1805), a backflow Kong (1806) and an overflow hole III (1807), the flow passage conversion joint (25) is provided with a boss i (2501), a boss ii (2502), a boss 2503) and an overflow hole IV (2504), the bottom end of the outer tube E (14), the bottom end of the inner tube F (15), the top end of the outer tube H (23), the top end of the inner tube G (22) are respectively fixed with the boss IX (1), the boss XI (1803), the boss XI (18016) of the lower drainage joint (18) through threads, the boss XII (1803) and the boss XII (1803) respectively, the boss XII (1803) is fixed with the inner tube (16) in the jet tube, the jet tube gasket (16), the drainage nozzle (19) is connected with the drainage nozzle connecting block (21) through threads, the drainage nozzle stop block (20) is connected with the drainage nozzle connecting block (21) through threads and a boss XII (1804) of the lower drainage joint (18) respectively, and the bottom end of the outer tube H (23) and the lower flow dividing plate (24) are connected with a boss i (2501) and a boss iii (2503) of the runner conversion joint (25) through threads respectively.

2. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the supercharging joint (3) is internally provided with a throat channel (3-1), the bottom end of the throat channel (3-1) is provided with a mixing pipe for momentum exchange between power liquid and returned liquid, and the top end of the throat channel (3-1) is provided with a diffusion pipe for decelerating and supercharging the returned liquid.

3. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the two sides of the upper flow dividing plate (11) and the lower flow dividing plate (24) are respectively provided with a cylindrical separation layer I (11-1) and a cylindrical separation layer II (24-1), and the two sides of the upper flow dividing plate and the two sides of the lower flow dividing plate are respectively provided with a cylindrical separation layer I (11-1) and a cylindrical separation layer II (24-1) which have the function of dividing power fluid; the middle is respectively provided with a conical flow guiding column I (11-2) and a conical flow guiding column II (24-2) which are respectively used for the power fluid to enter the drainage tube (8) and the inner tube G (22).

4. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the outer side of the upper drainage joint (4) is provided with backflow holes I (405) and overflow holes I (406) which are uniformly distributed in the circumferential direction and are respectively used for flowing the returned liquid and the power liquid; the middle is provided with a backflow hole II (407) containing a throat channel for sucking the backflow liquid of the backflow hole I (405).

5. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the outside of the reflux joint (12) is provided with reflux Kong (1207) and an overflow hole II (1208) which are uniformly distributed in the circumferential direction and are respectively used for circulating the reflux liquid and the power liquid; a return hole III (1206) is arranged in the middle and is used for circulating the return liquid after passing through the jet pipe (16).

6. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the outer side of the lower drainage joint (18) is provided with circumferentially and uniformly distributed suction holes (1805) and overflow holes III (1807) which are respectively used for sucking mixed slurry and circulating power liquid; a reflux hole V (1806) is arranged in the middle and is used for circulating the power fluid after passing through the inner tube G (22).

7. A downhole concentric tube hydraulic lift pump as claimed in claim 1, wherein: the runner conversion joint (25) is provided with key slot type overflow holes IV (2504) which are uniformly distributed in the circumferential direction and are used for enabling power fluid to flow to a bottom tubular column.

8. A pumping and lifting method using a downhole concentric tube hydraulic lifting pump as claimed in any one of claims 1-7, characterized in that: when the production operation is carried out, the working procedures of the method are divided into a ground pumping process, a power liquid injection process, a power liquid downward moving process, a mixed slurry sucking process, a returned liquid pressurizing process and a returned liquid lifting process, and the steps are as follows:

s1, a ground pumping process: the tool is connected into the underground device combination, the frequency conversion control cabinet on the ground controls the flow of the power fluid by controlling the rotating speed of the ground pump, the output of the mixed slurry can be regulated, and the power fluid reaches the annulus between the outer pipe A (1) and the inner pipe B (2) through the pipe column after being pressurized by the ground pump;

s2, a power fluid injection process: after the high-pressure power fluid enters the annulus between the drainage tube (8) and the inner tube C (9) through the overflow hole I (406) from the annulus between the outer tube A (1) and the inner tube B (2), the high-pressure power fluid passes through the upper flow dividing plate (11), the upper flow dividing plate (11) has a flow dividing function on the power fluid, one part of the power fluid enters the drainage tube (8), the other part of the power fluid enters the annulus between the outer tube E (14) and the inner tube F (15) through the overflow hole II (1208), and then enters the annulus between the inner tube G (22) and the outer tube H (23) through the overflow hole III (1807);

s3, a power fluid downward moving process: the high-pressure power fluid passes through an annulus between the inner tube G (22) and the outer tube H (23) and passes through a lower flow dividing plate (24), the power fluid is divided by the lower flow dividing plate (24), and a part of the power fluid enters the lower tubular column through an overflow hole IV (2504);

s4, a mixed slurry sucking process: the other part of high-pressure power fluid which is split by the lower splitter plate (24) enters the inner pipe G (22), negative pressure is generated at the nozzle of the drainage nozzle (19), mixed slurry is sucked into the jet pipe (16) through the suction hole (1805), the power fluid and the mixed slurry are mixed to form a return fluid, the return fluid enters the inner pipe F (15) after being subjected to speed reduction and pressurization, and then the return fluid sequentially passes through the reducer union (13) and the return fluid Kong (1207) and enters an annulus between the inner pipe C (9) and the outer pipe D (10);

s5, a returning liquid pressurizing process: a part of high-pressure power fluid which is split by the upper splitter plate (11) enters the drainage tube (8), negative pressure is generated at the nozzle of the pressurizing nozzle (5), annulus return fluid between the inner tube C (9) and the outer tube D (10) is sucked into the pressurizing joint (3) through the return hole I (405), and the return fluid and the power fluid are mixed in the pressurizing joint (3) and enter the inner tube B (2) after being decelerated and pressurized;

s6, lifting the returned liquid: under the double negative pressure absorption action of the pressurizing mechanism and the drainage mechanism, the returned liquid enters the upper pipe column through the inner pipe B (2), reaches the ground through pipe column migration, and is subjected to sand removal, oil-gas-liquid separation and purification, and cycle reciprocation, so that high-efficiency production operation is realized.