阅读说明：本技术 水平井管内螺旋泵均衡提液装置 (Balanced liquid extracting device for spiral pump in horizontal well pipe ) 是由 陈阳 王绍先 张建国 齐志刚 张磊 魏新芳 马明新 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种水平井管内螺旋泵均衡提液装置,主要由油管、过电缆封隔器、电潜泵机组、套管扶正器、电缆、悬挂扶正器、完井筛管、扶正器、驱动电机、防转锚定机构、螺旋泵体、洗井阀和引鞋组成。其中：电潜泵机组为常规电潜泵组件外加一保护套以提高承重负荷；螺旋泵为独立内管工具,下至水平井投产段指定位置,并通过油管连接上部电潜泵,二者共用电力传输和地面控制系统。螺旋泵井下电机驱动螺旋叶轮,将管内液体由下游推挤至上游,既可平衡滤砂管两端生产压差,改善投产段流入剖面均衡性,又具备提液功效,进而达到充分发挥水平井采液优势的目的。(The invention relates to a spiral pump balanced liquid extracting device in a horizontal well pipe, which mainly comprises an oil pipe, a cable-passing packer, an electric submersible pump unit, a casing centralizer, a cable, a suspension centralizer, a well completion sieve pipe, a centralizer, a driving motor, an anti-rotation anchoring mechanism, a spiral pump body, a well washing valve and a guide shoe. Wherein: the electric submersible pump unit is a conventional electric submersible pump component and is additionally provided with a protective sleeve to improve the bearing load; the screw pump is an independent inner pipe tool and is arranged at a designated position of a horizontal well production section, and is connected with an upper electric submersible pump through an oil pipe, and the screw pump and the upper electric submersible pump share a power transmission and ground control system. The motor drives the spiral impeller in the screw pump well, pushes the liquid in the pipe from the downstream to the upstream, can balance the production pressure difference at two ends of the sand filtering pipe, improves the inflow section balance of the production section, has the effect of extracting liquid, and further achieves the purpose of fully playing the advantages of the horizontal well liquid extraction.)

1. A horizontal well in-pipe screw pump balanced liquid extracting device mainly comprises an oil pipe (1), a cable-passing packer (2), an electric submersible pump unit (3), a casing centralizer (5), a cable (6), a suspension centralizer (7), a well completion sieve pipe (8), a centralizer (9), a driving motor (10), an anti-rotation anchoring mechanism (11), a screw pump body (12), a well washing valve (13) and a guide shoe (14); the method is characterized in that:

the upper part of an electric submersible pump unit (3) is connected with an upper section oil pipe (1), the lower part of the electric submersible pump unit (3) is connected with a casing centralizer (5), a cable passing packer (2) is arranged at the connecting section of the upper section oil pipe (1) and the electric submersible pump unit (3), the lower part of the casing centralizer (5) is sequentially connected with a centralizer (9), a driving motor (10), an anti-rotation anchoring mechanism (11), a spiral pump body (12), a well flushing valve (13) and a guide shoe (14) through a transition oil pipe (1), a well completion sieve pipe (8) is sleeved outside the centralizer (9), the driving motor (10), the anti-rotation anchoring mechanism (11) and the spiral pump body (12), the well completion sieve pipe (8) is hung on the inner wall of the lower end part of a casing (4) through a hanging centralizer (7), and a cable (6) sequentially passes through the cable packer (2), the electric submersible pump unit (3) and the casing centralizer (5), The suspension centralizer (7) is connected with a driving motor (10).

2. The horizontal well pipe internal screw pump balanced liquid extracting device according to claim 1, which is characterized by further comprising a centralizer (9) arranged among the screw pump body (12), the anti-rotation anchoring mechanism (11) and the well flushing valve (13).

3. The horizontal well pipe internal screw pump balanced liquid extracting device according to claim 1 or 2 is characterized in that the electric submersible pump unit (3) mainly comprises a cable joint (301), an inner joint (302), an oil drain valve (303), a check valve (304), a pump (305), an electric submersible pump protection pipe (306), an oil-gas separator (307), an oil-submersible motor protector (308), an oil-submersible motor (309) and a protection pipe end joint (310); wherein: the electric submersible pump protection tube (306) is a hollow rotary body, the upper end and the lower end of the electric submersible pump protection tube are respectively connected with a connector (310) at the end part of the protection tube, and a through hole array is processed at the position of the tube wall around the axis; after an oil drain valve (303), a check valve (304), a pump (305), an electric submersible pump protection pipe (306), an oil-gas separator (307), an oil-submersible motor protector (308) and an oil-submersible motor (309) are sequentially connected from top to bottom, the upper part of the oil drain valve is connected with an end connector (310) of an upper protection pipe through an inner connector (302), and the lower part of the oil drain valve is connected with an end connector (310) of a lower protection pipe through a fixing block; the cable joint (301) is respectively arranged on the end joint (310) of the upper and lower protection tube ends, after the cable (6) sequentially passes through the upper cable joint (301), the end joint (310) of the upper protection tube end and the protection tube (306) of the electric submersible pump to be connected into the submersible motor protector (308), the cable (6) is led out through the end joint (310) of the lower protection tube end and the lower cable joint (301).

4. The horizontal well pipe inner screw pump balanced liquid extracting device according to claim 3, wherein the screw pump body (12) mainly comprises a transmission shaft connecting sleeve (120), a bearing (121), a screw pump end cover (122), a screw pump outer sleeve (123) and a screw impeller (124); wherein: two ends of a spiral pump jacket (123) are respectively connected with a spiral pump end cover (122) to form a pump cylinder body, a spiral impeller (124) is communicated with a central shaft (1242) and is arranged in the spiral pump cylinder body, the upper end of the central shaft (1242) is connected with an output shaft of a driving motor (10) above through a transmission shaft connecting sleeve (120), and a plurality of strip-shaped through holes (1221) are processed around the shaft center in the conical shoulder part of the spiral pump end cover (122).

5. The device for uniformly extracting liquid from a spiral pump in a horizontal well pipe according to claim 4, wherein the end joint (310) of the protection pipe is a hollow rotary body with different diameters from top to bottom, a tapered external thread (3101) which is connected and matched with the oil pipe (1) is processed at the upper end, a cable through hole a (3102) is processed at the middle step, and a gradient internal thread a (3103) and an internal thread b (3104) are processed at the lower end.

6. The spiral pump balanced liquid extracting device in the horizontal well pipe as claimed in claim 5, wherein the inner joint (302) is a hollow rotary body with different diameters from top to bottom, the upper end part is provided with an external thread a (3021) which is connected and matched with an internal thread b (3104) of the end joint (310) of the protection pipe, the lower end part is provided with an internal thread c (3022) which is connected and matched with the oil drain valve (303), and the middle step part is provided with a cable through hole b (3023).

7. The device for uniformly extracting liquid from the spiral pump in the horizontal well pipe according to claim 6, wherein the electric submersible pump protection pipe (306) is a hollow rotary body, the upper end and the lower end of the electric submersible pump protection pipe are respectively provided with an external thread b (3062) which is connected and matched with an internal thread a (3103) of a connector (310) at the end part of the protection pipe, and the pipe wall is provided with an array of long through holes (3061) around the axis.

8. The device for uniformly extracting liquid from the spiral pump in the horizontal well pipe according to claim 7, wherein the casing centralizer (5) is a hollow rotary body, a plurality of centralizing blocks are arranged on the periphery of the casing centralizer, and the upper end part and the lower end part of the casing centralizer are respectively connected with the tapered external thread (3101) of the joint (310) at the end part of the protection pipe and the transition oil pipe (1) through threads.

9. The horizontal well pipe inner screw pump balanced liquid extracting device according to claim 8, wherein the centralizer (9) is a hollow rotary body, a plurality of cable grooves (91) are machined around the axis at the excircle part, a plurality of centralizer sheets (92) are arranged at the periphery, the upper part of the pipe body is connected with the transition oil pipe (1), the lower part of the pipe body is connected with the driving motor (10), and a through hole a (95) is machined at the axis part.

10. The horizontal well pipe inner screw pump balanced liquid extracting device according to claim 9, wherein the transmission shaft connecting sleeve (120) is a hollow rotary body, and a semicircular rectangular through hole (1201) is processed at the axis; the spiral pump end cover (122) is a hollow rotary body, an external thread c (1222) and a through hole b (1224) which are connected with the driving motor (10) are processed at the axis of the top end of the spiral pump end cover, and an external thread d (1223) is processed at the lower end part of the main body; the screw pump outer sleeve (123) is a tubular body, and the upper end and the lower end of the screw pump outer sleeve are respectively provided with an internal thread d (1231) and an internal thread e (1232) which are connected with an external thread d (1223) of the screw pump end cover (122); the helical impeller (124) is characterized in that helical blades (1241) are welded on a central shaft (1242), a semicircular rectangular shaft (1243) is machined at the butt joint end of the central shaft (1242) and the transmission shaft connecting sleeve (120), and a rotating shaft (1244) is machined at the other end.

Technical Field

The invention relates to a horizontal well oil extraction device in the field of oil exploitation, in particular to a horizontal well pipe inner screw pump balanced liquid extraction device.

Background

At present, horizontal wells are commonly used in victory oil fields to exploit high-water-content oil layers, and a plurality of single oil layers show stronger bottom water oil layer development characteristics. In the mining process, the horizontal well is influenced by the heel-toe effect and the heterogeneity of an oil layer, so that the water ridge rises unevenly, the oil layer cannot supply liquid to the horizontal well in a balanced manner, and the problems that the water breakthrough time of the horizontal well is short, the water content of produced liquid rises quickly and the like are caused. In order to solve the problems, experts and scholars in relevant fields at home and abroad develop a plurality of horizontal well water plugging and controlling technologies, which are mainly divided into two categories, namely a chemical method and a mechanical method at present.

The chemical method can be classified into the reservoir transformation category, and the implementation method comprises the steps of injecting a water plugging agent of a specified type into a water producing interval, plugging pores and tiny cracks of a rock matrix, and preventing formation water from being produced. The chemical method has the following problems: only when the general agent injection condition is mature (the permeability of the target plugging layer section is obviously higher than that of other layer sections), the water plugging construction is simple and convenient and has good effect, otherwise, the packer is required to be used for accurate positioning, and the construction difficulty and the cost are obviously improved; chemical methods have a high risk of contaminating the reservoir and are irreversible after contamination.

The mechanical method is mainly embodied in various types of horizontal well water control completion devices, and the special type of flow channel is arranged to generate appropriate additional pressure drop and limit the section with overlarge flow rate so as to adjust the liquid production profile of the production section. The water control completion device which is widely applied has three types: the variable-hole-density sieve tube, the central tube and the inflow controller are widely applied, the inflow controller is firstly applied to a Troll gas field in North sea of Norway in the early 90 th century, the inflow controller is also primarily applied to China in the last decade, and a large number of novel products are reported in China, and typical related documents comprise: patents 201410252818.2, 201410501115.9, 201410638607.2, 201420309993.6, 201610890102.4 and 201810538577.6. The water control well completion technology has the following problems: the method is not suitable for overcoming the low liquid yield horizontal well commonly existing in the oil field at the cost of single well productivity.

The Chinese patent application No. 201410501693.2 is an improvement on the water control mechanism level aiming at the existing water control well completion technology, and provides a screw pump sand filtering pipe which comprises a central pipe, a thin-wall pipe and a sand filtering net material, wherein the thin-wall pipe is arranged outside the central pipe in a sealing manner, the sand filtering net material is clamped between the central pipe and the thin-wall pipe, a plurality of through holes are radially arranged on the pipe walls of the central pipe and the thin-wall pipe, at least two groups of bearing frames and bearing assemblies are arranged inside the central pipe, a screw pump shaft penetrates through the bearings, the bearings and the screw pump shaft form rotary fit, and screw blades are fixedly wound on the screw pump shaft between the bearings. Two ends of the central tube extend out of two ends of the thin-wall tube, and threads are processed at the extending end. Two bearing brackets and bearing assemblies at the end of the center tube are near the protruding end of the center tube. According to the spiral pump sand filtration pipe, the Archimedes spiral pump is introduced into the sand filtration pipe, the spiral pump is installed at a designated position of a production section, the upper part of the sand filtration pipe is matched with the electric submersible pump, the electric submersible pump shares a power transmission and ground control system, the underground motor drives the spiral impeller to push liquid in the pipe from a downstream end to an upstream end, the production pressure difference of two end sections of the pipe is balanced, the production liquid of the upstream section is remarkably promoted, the production liquid of the downstream section is properly inhibited, and therefore the inflow section balance of the production section is improved. The advantages of the spiral pump sand screen technology include: the sand filtering pipe is provided with power, has the function of extracting liquid and is suitable for the working conditions of high-viscosity fluid and bottom liquid yield; the spiral impeller in the sand filtering pipe has no requirement on sealing performance, has simple and reliable structure and is suitable for the working condition of high-sand-content fluid; the rotating speed of the spiral impeller can be changed at any time in the working process, and the liquid production profile can be adjusted in real time. The problems with this technique are: the spiral pump and the sieve tube are integrated into a whole, and the sieve tube can be buried by sand after production, so that the sieve tube is difficult to pull out for maintenance; the screw pump occupies the space in the pipe, and other working tools cannot be put in; the cable needs to be arranged outside the screen pipe column, only the perforated casing can be put in, and the cable is worn when the perforated casing is put in an open hole shaft.

Therefore, it is necessary to make a significant improvement to the existing problems of the spiral pump sand screen.

Disclosure of Invention

The invention aims to provide a spiral pump balanced extracting device in a horizontal well pipe, aiming at the problems of a spiral pump sand filtering pipe related to patent application No. 201410501693.2. The device changes the screw pump into an independent inner pipe tool, is connected with the upper electric submersible pump through the oil pipe, does not change the structure of the original well completion pipe column, and is easy to accept by an oil production plant; the tool radius of the in-pipe spiral pump is small, the in-pipe spiral pump is easy to run in, the in-pipe spiral pump is suitable for the working condition of small well diameter, and the in-pipe spiral pump can also be used for the balanced extract of an old well; the length of the oil pipe hung on the upper part of the tool can be changed when the tool is put down again, the well-entering depth of the screw pump is adjusted, or the screw pumps with different lengths are replaced, and the liquid-pushing capacity of the screw pump is adjusted.

The technical scheme of the invention is as follows:

a horizontal well in-pipe screw pump balanced liquid extracting device mainly comprises an oil pipe, a cable passing packer, an electric submersible pump unit, a casing centralizer, a cable, a suspension centralizer, a well completion sieve pipe, a centralizer, a driving motor, an anti-rotation anchoring mechanism, a screw pump body, a well washing valve and a guide shoe; wherein:

the upper part of the electric submersible pump unit is connected with an upper section of oil pipe, the lower part of the electric submersible pump unit is connected with a casing centralizer, a cable passing packer is arranged at the connecting section of the upper section of oil pipe and the electric submersible pump unit, the lower part of the casing centralizer is sequentially connected with the centralizer, a driving motor, an anti-rotation anchoring mechanism, a spiral pump body, a well washing valve and a guide shoe through a transition oil pipe, a well completion sieve pipe is sleeved on the centralizer, the driving motor, the anti-rotation anchoring mechanism and the outside of the spiral pump body, the well completion sieve pipe is hung on the inner wall of the lower end part of a casing through a hanging centralizer, and a cable sequentially passes through the cable packer, the electric submersible pump unit, the casing centralizer and the hanging centralizer and is connected with the driving motor.

The above scheme further comprises:

the well washing valve also comprises a centralizer arranged between the spiral pump body and the anti-rotation anchoring mechanism as well as between the spiral pump body and the anti-rotation anchoring mechanism.

The electric submersible pump unit mainly comprises a cable joint, an inner joint, an oil drain valve, a check valve, a pump, an electric submersible pump protection pipe, an oil-gas separator, an oil-submersible motor protector, an oil-submersible motor and a protection pipe end joint; wherein: the protection tube of the electric submersible pump is a hollow rotary body, the upper end and the lower end of the protection tube are respectively connected with the end joint of the protection tube, and the tube wall is processed with a through hole array around the axis; after the oil drain valve, the check valve, the pump, the electric submersible pump protection pipe, the oil-gas separator, the submersible motor protector and the submersible motor are sequentially connected from top to bottom, the upper part is connected with the end connector of the upper protection pipe through an inner connector, and the lower part is connected with the end connector of the lower protection pipe through a fixing block; the cable joint is respectively arranged on the end joints of the protection pipes at the upper end and the lower end, the cable sequentially passes through the upper cable joint, the end joint of the upper protection pipe and the protection pipe of the electric submersible pump from top to bottom and is connected into the protector of the submersible motor, and then the cable is led out through the end joint of the lower protection pipe and the lower cable joint.

The spiral pump body mainly comprises a transmission shaft connecting sleeve, a bearing, a spiral pump end cover, a spiral pump jacket and a spiral impeller; wherein: the two ends of the screw pump jacket are respectively connected with the screw pump end cover to form a pump cylinder body, the screw impeller is communicated with the central shaft and is arranged in the screw pump cylinder body, the upper end of the central shaft is connected with the output shaft of the driving motor above through a transmission shaft connecting sleeve, and a plurality of strip-shaped through holes are processed around the axis of the conical shoulder part of the screw pump end cover.

The end joint of the protection tube is a hollow rotary body with different diameters from top to bottom, a tapered external thread connected and matched with the oil tube is processed at the upper end, a cable through hole a is processed at the middle step, and a gradient internal thread a and an internal thread b are processed at the lower end.

The inner joint is a hollow rotary body with different diameters from top to bottom, the upper end part of the inner joint is provided with an external thread b which is connected and matched with the internal thread b of the end joint of the protection pipe, the lower end of the inner joint is provided with an internal thread c which is connected and matched with the oil drain valve, and the middle step is provided with a cable through hole b.

The electric submersible pump protection tube is a hollow rotary body, the upper end part and the lower end part are respectively provided with an external thread b which is connected and matched with the internal thread a of the end joint of the protection tube, and the tube wall is provided with a strip through hole array around the axis.

The casing centralizer is a hollow rotary body, a plurality of centralizing blocks are arranged on the periphery of the casing centralizer, and the upper end part and the lower end part of the casing centralizer are respectively connected with the conical external threads of the end joint of the protection pipe and the transition oil pipe through threads.

The centralizer is a hollow rotary body, a plurality of cable grooves are machined in the excircle portion around the axis, a plurality of centralizer pieces are arranged on the periphery of the centralizer, the upper portion of the pipe body is connected with the transition oil pipe, the lower portion of the pipe body is machined to be connected with the driving motor, and a through hole a is machined in the axis.

The transmission shaft connecting sleeve is a hollow rotary body, and a semicircular rectangular through hole is processed at the axis; the spiral pump end cover is a hollow rotary body, an external thread c and a through hole b which are connected with a driving motor are processed at the axis of the top end of the spiral pump end cover, and an external thread d is processed at the lower end part of the main body; the screw pump outer sleeve is a tubular body, and the upper end and the lower end of the screw pump outer sleeve are respectively provided with internal threads d and e connected with external threads c of the screw pump end cover; the spiral impeller is characterized in that a spiral blade is welded on a central shaft, a semicircular rectangular shaft is machined at the butt joint end of the central shaft and a transmission shaft connecting sleeve, and a rotating shaft is machined at the other end of the central shaft.

The screw pump is an independent inner pipe tool, is arranged at a specified position of a horizontal well production section, is connected with an upper electric submersible pump through an oil pipe, and shares a power transmission and ground control system. The motor drives the spiral impeller in the screw pump well, pushes the liquid in the pipe from the downstream to the upstream, can balance the production pressure difference at two ends of the sand filtering pipe, improves the inflow section balance of the production section, has the effect of extracting liquid, and further achieves the purpose of fully playing the advantages of the horizontal well liquid extraction.

Drawings

FIG. 1 is a schematic diagram of an application of a balanced pumping device of a spiral pump in a horizontal well pipe according to the present invention;

in the figure: 1. the device comprises an oil pipe, 2 an over-cable packer, 3 an electric submersible pump unit, 4 a casing, 5 a casing centralizer, 6 a cable, 7 a suspension packer, 8 a well completion sieve pipe, 9 a centralizer, 10 a driving motor, 11 an anti-rotation anchoring mechanism, 12 a spiral pump body, 13 a well washing valve, 14 and a guide shoe.

FIG. 2 is a schematic structural diagram of an electric submersible pump assembly provided by the present invention;

in the figure: 301. cable joint, 302, inner joint, 303, oil drain valve, 304, check valve, 305, pump, 306, electric submersible pump protection tube, 307, oil-gas separator, 308, submersible motor protector, 309, submersible motor, 310, protection tube end joint.

FIG. 3 is a schematic diagram of a screw pump mechanism according to the present invention;

in the figure, 120, a transmission shaft connecting sleeve, 121, a bearing, 122, a screw pump end cover, 123, a screw pump outer sleeve, 124 and a screw impeller.

FIG. 4 is a schematic structural view of a nipple provided by the present invention;

in the figure: 3021. external threads a, 3022, internal threads c, 3023, and a cable through hole b.

Fig. 5 is a schematic structural view of an end fitting of a protection pipe provided by the present invention;

in the figure: 3101. tapered external threads, 3102, cable through holes a, 3103, lower internal threads a, 3104, internal threads b.

FIG. 6 is a schematic structural diagram of the protection tube of the electric submersible pump provided by the invention;

in the figure: 3062. external threads b, 3061 and a long through hole.

FIG. 7 is a schematic structural view of a centralizer provided by the present invention;

in the figure: 91. cable groove, 92, centralizer piece, 93, upper portion internal thread, 94, lower portion internal thread, 95, through-hole a.

Fig. 8 is a schematic structural view of a connecting sleeve of a transmission shaft provided by the invention;

in the figure: 1201. semicircular rectangular through holes.

FIG. 9 is a schematic structural view of a screw pump end cap provided by the present invention;

in the figure: 1221. strip-shaped through hole 1222, external thread c, 1224, through hole b, 1223 and external thread d.

FIG. 10 is a schematic structural view of a screw pump jacket provided in accordance with the present invention;

in the figure: 1231. Upper internal threads d, 1232 and lower internal threads e.

FIG. 11 is a schematic structural view of a helical impeller provided by the present invention;

in the figure: 1241. helical blade, 1242, central shaft, 1243, semicircle rectangle axle, 1244, rotation axis.

Detailed description of the invention

The invention is further described with reference to the following figures and specific examples.

Example 1

A horizontal well pipe internal screw pump balanced liquid extracting device mainly comprises an oil pipe 1, a cable-passing packer 2, an electric submersible pump unit 3, a casing centralizer 5, a cable 6, a suspension centralizer 7, a well completion sieve pipe 8, a centralizer 9, a driving motor 10, an anti-rotation anchoring mechanism 11, a screw pump body 12, a well flushing valve 13 and a guide shoe 14; wherein:

the upper part of an electric submersible pump unit 3 is connected with an upper section oil pipe 1, the lower part of the electric submersible pump unit 3 is connected with a casing centralizer 5, a cable passing packer 2 is arranged at the connecting section of the upper section oil pipe 1 and the electric submersible pump unit 3, the lower part of the casing centralizer 5 is sequentially connected with a centralizer 9, a driving motor 10, an anti-rotation anchoring mechanism 11, a spiral pump body 12, a well washing valve 13 and a guide shoe 14 through a transition oil pipe 1, a well completion sieve pipe 8 is sleeved on the centralizer 9, the driving motor 10, the anti-rotation anchoring mechanism 11 and the outer part of the spiral pump body 12, the well completion sieve pipe 8 is hung on the inner wall of the lower end part of a casing 4 through a hanging centralizer 7, and a cable 6 sequentially passes through the cable passing packer 2, the electric submersible pump unit 3, the casing centralizer 5 and the hanging centralizer 7 and is connected to the driving motor 10.

Example 2

The above embodiment 1 further includes: and the centralizer 9 is arranged between the spiral pump body 12 and the anti-rotation anchoring mechanism 11 and between the spiral pump body and the well flushing valve 13.

Example 3

On the basis of the embodiment 1 or 2, the electric submersible pump unit 3 mainly comprises a cable joint 301, an inner joint 302, an oil drain valve 303, a check valve 304, a pump 305, an electric submersible pump protection pipe 306, an oil-gas separator 307, an oil-submersible motor protector 308, an oil-submersible motor 309 and a protection pipe end joint 310; wherein: the electric submersible pump protection tube 306 is a hollow rotary body, the upper end and the lower end of the electric submersible pump protection tube are respectively connected with a connector 310 at the end part of the protection tube, and a through hole array is processed at the position of the tube wall around the axis; after the oil drain valve 303, the check valve 304, the pump 305, the electric submersible pump protection pipe 306, the oil-gas separator 307, the submersible motor protector 308 and the submersible motor 309 are sequentially connected from top to bottom, the upper part is connected with an end connector 310 of the upper protection pipe through an inner connector 302, and the lower part is connected with an end connector 310 of the lower protection pipe through a fixing block; the cable joint 301 is respectively arranged on the end joint 310 of the upper and lower protection tube ends, after the cable 6 sequentially passes through the upper cable joint 301, the end joint 310 of the upper protection tube and the electric submersible pump protection tube 306 from top to bottom and is connected into the submersible motor protector 308, the cable 6 is simultaneously led out through the end joint 310 of the lower protection tube and the lower cable joint 301.

The spiral pump body 12 mainly comprises a transmission shaft connecting sleeve 120, a bearing 121, a spiral pump end cover 122, a spiral pump jacket 123 and a spiral impeller 124; wherein: two ends of the screw pump jacket 123 are respectively connected with the screw pump end cover 122 to form a pump cylinder body, the screw impeller 124 is communicated with the central shaft 1242 to be arranged in the screw pump cylinder body, the upper end of the central shaft 1242 is connected with the output shaft of the driving motor 10 above through the transmission shaft connecting sleeve 120, and the conical shoulder part of the screw pump end cover 122 is processed with a plurality of strip-shaped through holes 1221 around the shaft center.

Example 4

On the basis of embodiment 3, the end joint 310 of the protection tube is a hollow rotary body with different diameters from top to bottom, the upper end part is provided with a tapered external thread 3101 which is connected and matched with the oil tube 1, the middle step is provided with a cable through hole a3102, and the lower end part is provided with a gradient internal thread a3103 and an internal thread b 3104.

The inner joint 302 is a hollow rotary body with different diameters at the upper part and the lower part, the upper end part is provided with an external thread a3021 which is connected and matched with an internal thread b3104 of the end joint 310 of the protection pipe, the lower end part is provided with an internal thread c3022 which is connected and matched with the oil drain valve 303, and the middle step part is provided with a cable through hole b 3023.

The electric submersible pump protection tube 306 is a hollow rotary body, the upper end and the lower end of the electric submersible pump protection tube are respectively provided with an external thread b3062 which is connected and matched with the internal thread a3103 of the end joint 310 of the protection tube, and the tube wall is provided with a long through hole 3061 array around the axis.

The casing centralizer 5 is a hollow rotary body, a plurality of centralizing blocks are arranged on the periphery of the hollow rotary body, and the upper end part and the lower end part of the hollow rotary body are respectively connected with the conical external thread 3101 of the end connector 310 of the protection pipe and the transition oil pipe 1 through threads.

The centralizer 9 is a hollow rotary body, a plurality of cable grooves 91 are processed around the axis at the excircle part, a plurality of centralizer pieces 92 are arranged at the periphery, the upper part of the pipe body is connected with the transition oil pipe 1, the lower part of the pipe body is processed and connected with the driving motor 10, and a through hole a95 is processed at the axis.

The transmission shaft connecting sleeve 120 is a hollow rotary body, and a semicircular rectangular through hole 1201 is processed at the axis; the spiral pump end cover 122 is a hollow rotary body, an external thread c1222 and a through hole b1224 which are connected with the driving motor 10 are processed at the axis of the top end, and an external thread c1223 is processed at the lower end part of the main body; the screw pump outer sleeve 123 is a tubular body, and the upper end and the lower end of the screw pump outer sleeve are respectively provided with internal threads d1231 and e1232 which are connected with the external thread c1223 of the screw pump end cover 122; the helical impeller 124 is formed by welding helical blades 1241 on a central shaft 1242, a semicircular rectangular shaft 1243 is processed at the butt end of the central shaft 1242 and the transmission shaft connecting sleeve 120, and a rotating shaft 1244 is processed at the other end.

Example 5

A horizontal well pipe internal screw pump balanced liquid extracting device mainly comprises an oil pipe 1, an over-cable packer 2, an electric submersible pump unit 3, a casing centralizer 5, a cable 6, a suspension centralizer 7, a well completion sieve pipe 8, a centralizer 9, a driving motor 10, an anti-rotation anchoring mechanism 11, a screw pump body 12, a well flushing valve 13 and a guide shoe 14 (shown in figure 1).

The electric submersible pump unit 3 comprises a cable connector 301, an inner connector 302, an oil drain valve 303, a check valve 304, a pump 305, an electric submersible pump protection pipe 306, an oil-gas separator 307, a protector 308, an end connector 309 of a submersible motor protection pipe and an end connector 310 of a protection pipe (see figure 2).

The spiral pump body 12 is composed of a transmission shaft connecting sleeve 120, a bearing 121, a spiral pump end cover 122, a spiral pump jacket 123, a spiral impeller 124 and a cable connector 301 (see fig. 3).

The inner joint 302 (see fig. 4) is a hollow rotary body with different diameters, the upper end of the hollow rotary body is provided with an external thread a3021, the lower end of the hollow rotary body is provided with an internal thread b3022, and the middle step is provided with a through hole b 3023.

The end connector 310 (see fig. 5) of the protection tube is a hollow rotary body with different diameters from top to bottom, the upper end part is provided with a conical external thread 3101, the middle step is provided with a cable through hole a3102, and the lower end part is provided with an internal thread a3103 and an internal thread b 3104.

The electric submersible pump protection tube 306 (see fig. 6) is a hollow rotary body, the upper end and the lower end of the electric submersible pump protection tube are respectively provided with an external thread b3062, and the tube wall is provided with a long strip through hole 3061 array around the axis.

The centralizer 9 (see fig. 7) is a hollow revolving body, a plurality of cable grooves 91 are processed around the axis at the excircle part, a plurality of centralizer pieces 92 are arranged at the periphery, upper internal threads 93 are processed at the upper part of the pipe body, lower internal threads 94 are processed at the lower part of the pipe body, and a through hole a95 is processed at the axis.

The transmission shaft connecting sleeve 120 (see fig. 8) is a hollow revolving body, and a semicircular rectangular through hole 1201 is processed at the axis.

The spiral pump end cover 122 (see fig. 9) is a hollow rotary body, a plurality of strip-shaped through holes 1221 are processed around the axis of the conical shoulder, external threads c1222 and through holes b1224 are processed at the axis of the top end, and external threads d1223 are processed at the lower end part of the main body.

The screw pump casing 123 (see fig. 10) is a tubular body, and the upper end and the lower end of the casing are respectively provided with an internal thread d1231 and an internal thread e1232.

In the helical impeller 124 (see fig. 11), helical blades 1241 are welded on a central shaft 1242, a semicircular rectangular shaft 1243 is processed at the left end of the central shaft 1242, and a rotating shaft 1244 is processed at the right end.

Electric submersible pump assembly principle (see fig. 2): the oil drain valve 303, the check valve 304, the pump 305, the oil-gas separator 307, the protector 308 and the submersible motor 309 are sequentially connected in series and are connected with the cable 6. The female thread c3022 of the nipple 302 is screwed tightly to the upper part of the spill valve 303, and the male thread a3021 thereof is screwed tightly to the female thread b3104 of the protective pipe end fitting 310. The electric submersible pump protection pipe 306 is sleeved outside the electric submersible pump unit, and the internal thread a3103 of the protection pipe end connector 310 is tightly connected with the external thread b3062 of the electric submersible pump protection pipe 306. Similarly, the external thread b3062 at the lower end of the submersible pump protection pipe 306 is tightly connected with the internal thread a3103 of another identical protection pipe end fitting 310. The tapered thread 3101 of the protective tube end fitting 310 is threadedly connected to the casing centralizer 5.

Screw pump mechanism assembly principle (see fig. 3): the upper end of the driving motor 10 is connected with the internal thread 94 of the centralizer 9, and the driving motor 10 is fixedly connected with the anti-rotation anchoring mechanism 11. The lower end of the anti-rotation anchoring mechanism 11 is tightly connected with the internal thread 93 on the centralizer 9, the transmission shaft connecting sleeve 120 is sleeved in the through hole a95 of the centralizer 9, and meanwhile, the output shaft of the driving motor is inserted into the semicircular rectangular hole 1201 of the transmission shaft connecting sleeve 120 to be in sliding fit. The internal thread 93 of the centralizer 9 is tightly connected with the external thread c1222 of the screw pump end cover 122, and the bearing 121 is installed in the through hole of the screw pump end cover 122. The semicircular rectangular shaft 1243 of the spiral pump blade 124 is sleeved in the semicircular rectangular hole 1201 of the transmission shaft connecting sleeve 120 in a sliding fit. The screw pump casing 123 is sleeved outside the screw pump blade 124, and the internal thread d1231 at the upper part is tightly connected with the external thread d1223 of the screw pump end cover 122. The external threads d1223 of the screw outer housing 123 are tightly coupled with the external threads b1224 of the screw end cap 122. At the same time, the lower end rotating shaft 1244 of the screw pump blade 124 is inserted into the through hole 1224 of the screw pump head 122 and is in sliding fit, and finally the external thread c1222 of the screw pump head 122 is tightly connected with the internal upper thread 93 of the centralizer 9.

The working principle of the balanced liquid extracting device of the spiral pump in the horizontal well pipe (see figure 1): the casing 4 is intact in the vertical section and in the horizontal section after completion by the suspended packer 7, completion screen 8, wash valve 13 and guide shoe 14 completion process. The internal thread 93 of the top centralizer 9 of the assembled screw pump mechanism is screwed to the bottom end of the oil pipe 1, the top end of which is connected to the casing centralizer 5 of the electrical submersible pump unit. The tapered thread 3101 of the end joint 310 of the protection pipe at the top end of the electric submersible pump unit is connected with the oil pipe 1 through the cable packer 2, and the cable 6 is fixed on the corresponding part by clips as required in the connection process.

The working principle of the horizontal well pipe internal screw pump balanced extracting solution technology (shown in figure 1) is as follows: the integrally connected assembly is lowered into the well, wherein the electric submersible pump unit is located in the straight well section, and the screw pump mechanism is located in the horizontal well section and completely enters the inner pipe of the well completion screen 8.

The working principle of the horizontal well pipe internal screw pump balanced extracting solution technology (shown in figure 1) is as follows: when the screw pump mechanism works, the driving motor 10 drives the screw pump blades 124 to rotate, and downhole fluid is driven by the screw impeller 1241 to be introduced from the strip-shaped through hole 1221 of the right screw pump end cover 122 of the screw pump body 12 and to be pushed out from the strip-shaped through hole 1221 of the left screw pump end cover 122 of the screw pump body 12.