阅读说明：本技术 一种适用于大斜度井泡沫排水采气的油管 (Oil pipe suitable for foam drainage gas production of highly deviated well ) 是由 石书强 戚志林 王佳伟 万小进 谢思宇 黄小亮 袁辉 张旭 成涛 莫非 梁玉凯 于 2020-07-02 设计创作，主要内容包括：本发明公开了一种适用于大斜度井泡沫排水采气的油管,包括外筒,以及以可转动方式设置于外筒内的内筒,所述内筒与外筒同轴设置,外筒的上下两端具有相互匹配的螺纹配合结构,内筒的内壁一侧具有沿其长度方向分布的弧形凸起部,所述弧形凸起部沿内筒的径向向内凸起,其凸出最高点靠近弧形凸起部的上端。对油管结构进行优化,主要采用与传统动态搅拌混合理论相反的静态混合理念,充分利用气液在大斜度井段分层特性,以静态结构进行各方向流体引导交汇,从而使气液在该井段内的油管中,上升过程能够持续混合,其混合更均匀彻底,大大提高气体携液能力,同时减小生产压力损耗,有利于保证正常产能。(The invention discloses an oil pipe suitable for foam drainage gas production of a highly deviated well, which comprises an outer barrel and an inner barrel rotatably arranged in the outer barrel, wherein the inner barrel and the outer barrel are coaxially arranged, the upper end and the lower end of the outer barrel are provided with thread matching structures matched with each other, one side of the inner wall of the inner barrel is provided with an arc-shaped bulge distributed along the length direction of the inner barrel, the arc-shaped bulge is inwards bulged along the radial direction of the inner barrel, and the highest point of the bulge is close to the upper end of the arc-shaped bulge. Optimize oil pipe structure, mainly adopt the static mixing theory opposite with traditional dynamic stirring theory, make full use of gas-liquid is at highly deviated well section layering characteristic to static structure carries out each direction fluid guide and crosses, thereby makes the gas-liquid in the oil pipe of this well section, and the process of rising can continuously mix, and its mixes more evenly thoroughly, improves gaseous liquid carrying ability greatly, reduces production pressure loss simultaneously, is favorable to guaranteeing normal productivity.)

1. The utility model provides an oil pipe suitable for gas production of highly deviated well foam drainage which characterized in that: including urceolus (1) to and set up inner tube (2) in urceolus (1) with rotatable mode, inner tube (2) and urceolus (1) coaxial setting, the upper and lower both ends of urceolus (1) have the screw-thread fit structure of mutual matching, and inner wall one side of inner tube (2) has arc bellying (20) along its length direction distribution, radial inside arch of inner tube (2) is followed in arc bellying (20), and its protrusion peak (H) is close to the upper end of arc bellying (20).

2. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 1, wherein: the outer wall of the inner barrel (2) is provided with outer channels (21) which are in one-to-one correspondence with the arc-shaped protrusions (20), the outer channels (21) are spiral, the upper end and the lower end of each outer channel are communicated with the inside of the inner barrel (2), the lower end of each outer channel is communicated with the lower portion of one side, opposite to the arc-shaped protrusions (20), of the corresponding inner channel, and the upper end of each outer channel is communicated with the highest point (H) of the corresponding arc-shaped protrusion (20).

3. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 2, wherein: the rotating directions of two adjacent outer channels (21) are opposite.

4. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 1, wherein: form concave part (22) between two adjacent arc bellying (20), have on the inner wall of inner tube (2) and set up with arc bellying (20) one-to-one interior passageway (23), interior passageway (23) are the heliciform, and both ends are uncovered from top to bottom, and the lower extreme is located one side relative with arc bellying (20), and the upper end corresponds concave part (22).

5. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 4, wherein: the rotating directions of the upper and lower adjacent inner channels (23) are opposite.

6. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 1, wherein: the lower end of the inner cylinder (2) is provided with a conical insertion part (24), and the contour of the inner cavity at the upper end of the inner cylinder (2) is adapted to the insertion part (24).

7. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 6, wherein: and a sealing ring (25) is sleeved on the insertion part (24).

8. Oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 6 or 7, characterized in that: the end part of the insertion part (24) is provided with a key groove (26) with an opening at the lower end, and the inner wall of the upper end of the inner cylinder (2) is provided with a flat key (27) matched with the key groove (26).

9. The oil pipe suitable for foam drainage gas production of highly deviated wells according to claim 8, wherein: the flat key (27) and the arc-shaped bulge (20) are positioned on the same side.

10. An oil pipe suitable for foam drainage gas production of highly deviated wells according to any one of claims 1 to 7, characterized in that: the inner cylinder (2) is arranged in the outer cylinder (1) through a tapered roller bearing (3).

Technical Field

The invention relates to the field of oil gas exploitation tools, in particular to an oil pipe suitable for foam drainage gas exploitation of a highly deviated well.

Background

Foam drainage gas production is one of the main means of natural gas exploitation, and it mainly produces water foam through the physical chemistry mode at the shaft bottom, and under the air current drive, through water foam with shaft bottom hydrops take away from the shaft bottom to reach clean shaft bottom, resume normal production's purpose, nevertheless because the influence of factors such as gas well output, hydrops volume, area of contact, it is not good often to have the foaming effect after adding the foaming agent, and it is relatively poor to carry the liquid effect, and drainage efficiency is low, needs some physical devices, carries out the physics stirring bubble.

In the prior art, a dynamic stirring device is mainly adopted, for example, patent number "CN 201610912449.4", entitled "foaming agent downhole stirring device suitable for foam drainage gas production process", in which the purpose of stirring and mixing is achieved mainly by driving blades to rotate by airflow, and patent number "CN 201510295693.6", entitled "cohesive foam drainage stirrer", which is mainly invented to improve foam drainage effect by changing flow pattern and blade rotation stirring and mixing.

However, when the production well is a highly deviated well and gas and liquid are conveyed by an underground oil pipe, the gas and liquid are seriously separated in the oil pipe of the inclined section because the oil pipe is of a smooth tube structure, the liquid carrying capacity of water bubbles is relatively weak in the process of rising along with airflow, the gas and the liquid must be continuously mixed, and if the stirring device adopting the scheme is adopted, the on-way pressure loss is large, the pressure is insufficient, the normal production is influenced and the like.

The invention mainly aims to solve the problem of serious layering of gas and liquid in an inclined oil pipe, realize static mixing of gas and liquid in an inclined shaft section by optimizing the structure of the oil pipe, reduce pressure loss, ensure production pressure and the like.

Disclosure of Invention

In order to solve the problems, the invention provides an oil pipe suitable for foam drainage gas production of a highly deviated well, which mainly weakens the gas-liquid stratification phenomenon in a static diversion impact mixing mode, improves the gas-liquid mixing effect, reduces the pressure loss and ensures the normal production.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the utility model provides an oil pipe suitable for gas production of highly deviated well foam drainage which the key lies in: the inner cylinder is arranged in the outer cylinder in a rotatable mode, the inner cylinder and the outer cylinder are arranged coaxially, the upper end and the lower end of the outer cylinder are provided with thread matching structures which are matched with each other, one side of the inner wall of the inner cylinder is provided with arc-shaped protrusions distributed along the length direction of the inner cylinder, the arc-shaped protrusions are protruded inwards along the radial direction of the inner cylinder, and the highest point of the protrusions is close to the upper end of the arc-shaped protrusions.

Structure more than adopting, each oil pipe connects gradually through the urceolus during use, and the inner tube is then gas-liquid transmission channel, when using it for highly deviated well, when oil pipe is in the inclined shaft section, because arc bellying place one side is heavier relatively, so under the action of gravity, this side is more close to inclined shaft section downside wall of a well relatively, gas-liquid is when this section flows, liquid is close to inner tube length direction's downside, gaseous upside that is close to length direction, nevertheless under the effect of arc bellying, liquid is every through an arc bellying, must be towards the upside and splash a section distance, thereby produce the mixture with the gas that is in the upside, through following journey multiple action, improve gas-liquid mixture effect greatly, guarantee that gaseous has better liquid-carrying capacity, and because adopt static structure, so loss of pressure is also less relatively.

Preferably, the method comprises the following steps: the outer wall of the inner barrel is provided with outer channels which are arranged in one-to-one correspondence with the arc-shaped protrusions, the outer channels are spiral, the upper ends and the lower ends of the outer channels are communicated with the inside of the inner barrel, the lower end of each outer channel is communicated with the lower portion of one side, opposite to the arc-shaped protrusions, of the inner barrel, and the upper end of each outer channel is communicated with the highest point, corresponding to the arc-shaped protrusions, of. Scheme more than adopting, will be in the gas guide of upside to the downside through outer passageway, and at the emergence of the protrusion peak position of arc bellying, be favorable to improving the height that can reach behind the liquid through protrusion peak, make it more be close to in the upside gas, thereby make gas-liquid mixture more abundant, and because the gas entry point is located the below of arc bellying, can reduce relatively and change side gas pressure, also enable liquid and move towards the upside more easily, in addition, with the direction leading-in and the emergence of spiral, the mixed liquid that produces like this has certain tangential upturned speed, be favorable to further improving mixing effect.

Preferably, the method comprises the following steps: the rotating directions of the upper and lower adjacent outer channels are opposite. By adopting the scheme, the outgoing directions of the two adjacent outer channels form mixed flow in the inner cylinder, the mixed flow is opposite in rotating direction and mutually intersected and impacted, and the mixed flow can be more fully and thoroughly mixed.

Preferably, the method comprises the following steps: a concave part is formed between every two adjacent arc-shaped protruding parts, inner channels which are arranged in one-to-one correspondence with the arc-shaped protruding parts are arranged on the inner wall of the inner barrel, each inner channel is in a spiral shape, the upper end and the lower end of each inner channel are open, the lower end of each inner channel is located on one side opposite to the corresponding arc-shaped protruding part, and the upper end of each inner channel corresponds to the corresponding concave part. The structure and principle of interior passageway and outer passageway are similar, and it is mainly with the gas guide of upside to the concave part position, when improving liquid towards the upside impact capacity, reduce the hydrops of concave part position.

Preferably, the method comprises the following steps: the rotating directions of the upper and lower adjacent inner channels are opposite. By adopting the scheme, the inner channels which are arranged in a staggered mode can serve as guide structures with different rotation directions, and meanwhile, fluid impact guiding can be performed, so that a liquid film is prevented from being formed on the inner wall of the inner cylinder, and the inner cylinder can be better converted into liquid drops so as to be convenient to carry.

Preferably, the method comprises the following steps: the lower end of the inner cylinder is provided with a conical insertion part, and the outline of the inner cavity at the upper end of the inner cylinder is adapted to the insertion part. By adopting the scheme, when the upper oil pipe and the lower oil pipe are connected, the inserting part of the inner cylinder in the upper oil pipe can be inserted into the upper end of the lower inner cylinder, and the conical structure can ensure that the two oil pipes are more tightly inserted, ensure that gas and liquid only flow in the inner cylinder, avoid entering a gap between the inner cylinder and the outer cylinder, and be beneficial to reducing pressure loss.

Preferably, the method comprises the following steps: the insertion part is sleeved with a sealing ring. By adopting the scheme, the connection sealing performance of the inner cylinders is improved, and gas-liquid mixing is further prevented.

Preferably, the method comprises the following steps: the end part of the insertion part is provided with a key groove with an opening at the lower end, and the inner wall of the upper end of the inner cylinder is provided with a flat key matched with the key groove. By adopting the scheme, when the oil pipes are connected, the arc-shaped protrusions of all the inner cylinders can be positioned on the same straight line through the matching of the flat keys and the key grooves, so that the inner cylinders can synchronously rotate after entering the well, namely the arc-shaped protrusions of the inner cylinders of the inclined shaft section are positioned on the lower side of the shaft.

Preferably, the method comprises the following steps: the flat key and the arc-shaped convex part are positioned on the same side. Scheme more than adopting, whether the follow well head that like this can be better judges the arc bellying and is located the downside of inclined shaft section pit shaft.

Preferably, the method comprises the following steps: the inner cylinder is arranged in the outer cylinder through a tapered roller bearing. The tapered roller bearing is adopted, so that the inner cylinder can smoothly rotate, and meanwhile, the tapered roller bearing has good axial load capacity and is beneficial to prolonging the service life of the whole tapered roller bearing.

Compared with the prior art, the invention has the beneficial effects that:

the oil pipe suitable for foam drainage gas production of the highly deviated well mainly adopts a static mixing concept opposite to the traditional dynamic stirring mixing theory, fully utilizes the layering characteristic of gas and liquid in the highly deviated well section, and conducts fluid guiding intersection in each direction by a static structure, so that the gas and the liquid can be continuously mixed in the oil pipe in the well section in the ascending process, the mixing is more uniform and thorough, the gas liquid carrying capacity is greatly improved, the production pressure loss is reduced, and the normal production capacity is favorably ensured.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a perspective view of the inner barrel;

FIG. 4 is a schematic illustration of the inner and outer channel distribution;

FIG. 5 is a cross-sectional view of FIG. 3;

FIG. 6 is an enlarged view of the upper end structure of the inner cylinder;

FIG. 7 is a schematic longitudinal cross-sectional view of an arcuate raised portion in an oil pipe of the present invention within an incline section;

fig. 8 is a transverse cross-sectional view of the arcuate lobe at the location of point H.

Detailed Description

The present invention will be further described with reference to the following examples and the accompanying drawings.

Referring to fig. 1 to 8, the oil pipe suitable for foam drainage gas production of highly deviated wells mainly comprises an outer cylinder 1 and an inner cylinder 2 which are both hollow tubular structures, wherein the upper end and the lower end of the outer cylinder 1 are provided with thread matching structures matched with each other, the structure of the oil pipe is similar to that of a common oil pipe, the lower end of the oil pipe is provided with a male buckle, the upper end of the oil pipe is provided with a female buckle matched with the male buckle, the inner cylinder 2 is fixedly arranged in the outer cylinder 1 through a tapered roller bearing 3 in the embodiment, as shown in the figure, the upper and lower ends of the inner cylinder 2 near the end are fixedly sleeved with tapered roller bearings 3, the outer ring of the tapered roller bearing 3 is welded on the inner wall of the outer cylinder 1, thus realizing the coaxial arrangement of the inner cylinder and the outer cylinder, enabling the inner cylinder 2 to rotate horizontally relative to the outer cylinder 1 without axial displacement, in addition, because the tapered roller bearing 3 has stronger axial bearing capacity, the stability and the reliability of the installation of the inner cylinder 2 can be improved.

The inner wall of the inner cylinder 2 is provided with a plurality of arc-shaped protrusions 20 distributed along the length direction of the inner cylinder, the arc-shaped protrusions 20 protrude inwards along the radial direction of the inner cylinder 2, and have a highest protrusion point H relative to the inner cylinder 2, referring to fig. 1, 6 to 8, in a single arc-shaped protrusion 20, the highest protrusion point H is relatively close to the upper end of the arc-shaped protrusion 20, namely, the lower part of the highest protrusion point H is an arc surface with a large radius, the upper part of the highest protrusion point H is an arc surface with a small radius, the arc-shaped protrusion 20 occupies about 90 degrees of arc in the circumferential direction, the vertical distance between the highest protrusion point H and the inner wall of the inner cylinder 2 is about 1/3-2/3 of the radius of the inner cylinder 2, and by adopting the values or the value range, the guiding effect on the liquid at the lower side in the inner cylinder.

On the basis, in the application, the outer wall of the inner barrel 2 is provided with the outer channels 21 corresponding to the arc-shaped protrusions 20 one by one, the outer channels 21 are spirally attached to the outer wall of the inner barrel 2, the whole of the outer channels is relatively independent from the inner cavity of the inner barrel 2, only the upper ends and the lower ends of the outer channels are communicated with the inner cavity of the inner barrel 2, as shown in fig. 1 and 4, the position where the lower end of the outer channel 21 is communicated with the inner barrel 2 is located on the side opposite to the arc-shaped protrusions 20 and lower than the lower end corresponding to the arc-shaped protrusions 20, the position where the upper end of the outer channel is communicated with the inner barrel 2 is located on the same side as the arc-shaped protrusions 20 and corresponds to the highest protrusion point H, a through hole communicated with the upper end of the outer channel 21 can be formed in the highest protrusion point H, or the through hole.

In a similar way, the inner channel 23 corresponding to the arc-shaped protrusions 20 one to one is arranged on the inner wall of the inner cylinder 2 in the application, as shown in the figure, a relatively low-lying concave portion 22 is formed between the two arc-shaped protrusions 20, the structure of the inner channel 23 is similar to that of the outer channel 21, the inner channel is attached to the inner wall of the inner cylinder 2 in a spiral shape, the upper end and the lower end of the inner channel 23 are both open, the lower end of the inner channel is located on one side opposite to the arc-shaped protrusions 20, and the upper end of the inner channel corresponds to the concave portion 22, namely, the upper.

The outer channel 21 and the inner channel 23 may be formed by surrounding a metal sheet material with the corresponding outer wall or inner wall of the inner cylinder 2, or may be formed by directly fixing a tubular structure on the outer wall or inner wall of the inner cylinder 2.

In order to fully improve the mixing effect, the distribution form of the inner channel and the outer channel is studied, for example, the turning directions of the two upper and lower adjacent outer channels 21 are opposite, the turning directions of the two upper and lower adjacent inner channels 23 are also opposite, even, the turning directions between the outer channel 21 and the inner channel 23 corresponding to the same arc-shaped protruding part 20 are also opposite, and the directions of the exit ports at the upper ends of the outer channel 21 and the inner channel 23 are changed by staggering the turning directions, so that vortexes with different turning directions are formed in the inner cylinder 2 more easily, and the effect of more fully and thoroughly mixing gas and liquid is achieved.

The inner cylinder 2 of the embodiment has six arc-shaped protrusions 20 distributed along the length direction thereof, each arc-shaped protrusion 20 has a corresponding circumferential angle of about 30 degrees, and the outer passage 21 and the inner passage 23 are almost half-spiral rings and have a rotation angle of about 180 degrees, so as to sufficiently reduce the pressure loss when the air flow passes through the corresponding passages.

The connection of upper and lower oil pipe is mainly through the thread fit at upper and lower both ends of urceolus 1, but in order to prevent the gas-liquid cross flow between urceolus 1 and inner tube 2, so in this embodiment, be equipped with at the lower extreme of inner tube 2 and be tapered insert 24, the big-end-up of insert 24 is little, simultaneously with inner tube 2 upper end tip inner chamber profile design be with insert 24 assorted taper hole structure, like this when two oil pipe connections from top to bottom, urceolus 1 is in the connection process, the upper portion inner tube 2 insert 24 then can insert the upper end of lower part inner tube 2, realize the sealing between the two through the conical surface, compress tightly through the conical surface simultaneously, make all inner tubes 2 relatively even cheng an organic whole between the inner tube, can synchronous rotation.

In order to further ensure that all the inner cylinders 2 can synchronously rotate, and simultaneously the arc-shaped protrusions 20 of all the inner cylinders 2 can be positioned on the same straight line, the lower ends of the outer walls of the insertion parts 24 are provided with key grooves 26, the lower parts of the key grooves 26 are open, correspondingly, the inner walls of the upper ends of the inner cylinders 2 are provided with flat keys 27 matched with the key grooves 26, when in connection, the flat keys 27 are embedded with the key grooves 26 on the upper and lower inner cylinders 2, so that the relative fixation of all the inner cylinders 2 in the circumferential direction is realized, after the connection, the relative rotation between all the inner cylinders 2 cannot occur, in the actual manufacturing process, the flat keys 27 and the arc-shaped protrusions 20 can be arranged on the same straight line, and a constructor can quickly judge whether the arc-shaped protrusions 20 in the inner cylinders 2 positioned in an inclined shaft section are positioned on the lower side of a shaft by observing the orientation of the flat keys 27 and integrating, in addition, in order to ensure that the key fit between the inner cylinders 2 does not interfere with the axial displacement during the connection of the screw threads when two oil pipes are connected, the lengths of the key grooves 26 and the flat keys 27 are usually set to be the same as or slightly longer than the length of the screw threads on the outer cylinder 1, so that the upper key groove 26 of the upper inner cylinder 2 is in a fit state with the lower flat key 27 before the male and female screw threads of the adjacent outer cylinder 1 are contacted, the screw threads rotate, the upper inner cylinder 2 mainly moves linearly (or can rotate along with the outer cylinder 1), namely, the flat keys 27 are opposite to the inner cylinder 2 close to the lower part along the direction of the flat keys 27, when the screw threads of the two outer cylinders 1 are connected, the flat keys 27 are completely embedded into the key grooves 26, and therefore, the problem that the key fit between the inner cylinders 1 interferes in the axial direction when the outer cylinders.

Further, in order to further improve the gas-liquid sealing effect, a packing 25 is fitted over the insertion portion 24, and the packing 25 is positioned above the key groove 26.

In consideration of the installation reliability and safety of the inner cylinder 2, the upper part of the inner cylinder 2 is further provided with the anti-dropping disc 28 in the embodiment, the anti-dropping disc 28 is of a horizontally arranged disc-shaped structure and extends outwards along the radial direction of the inner cylinder 2, and the outer diameter of the anti-dropping disc 28 is slightly smaller than the inner diameter of the outer cylinder 1, so that even if axial sliding displacement occurs between the inner cylinder 2 and the inner ring of the tapered roller bearing 3, the anti-dropping disc 28 can be hung on the outer ring of the tapered roller bearing 3, and the direct well dropping risk is reduced.

Referring to fig. 1 to 8, the oil pipe suitable for foam drainage gas production of highly deviated well, during the use, mainly connect through the thread at urceolus 1 upper and lower both ends, connect simultaneously, realize grafting and relatively fixed between each inner tube 2, after going into the well, the normal conditions, the inner tube 2 of inclined shaft section can remove towards the pit shaft downside under the action of gravity, thereby make the arc bellying 20 of this section more be close to the pit shaft downside, if the circumstances such as slight string card takes place of course, lead to rotating unsmoothly, also can judge through well head observation flat key 27.

In the production process, when the inner tube 2 of gas-liquid entering highly deviated well section, the gas-liquid is at upper and lower separation state initially, gas flows along the upside of inner tube 2 promptly, liquid then flows along the downside inner wall of inner tube 2, it is extremely poor wholly to take the liquid ability, and in this application, at first, constantly change liquid impact height through arc bellying 20, make it strike to the side up, carry out gas guidance with the help of outer channel 21 and inner channel 23 simultaneously, through gas self impact force, change the fluid flow direction, and make it at the internal rotation of inner tube 2, mix with the form of crisscross vortex, improve mixing efficiency greatly, it is more abundant thorough, make liquid more easily carried to ground by gas.

Compared with the traditional mixing and stirring structure, the invention mainly optimizes the structure of the existing oil pipe, adopts a static flow guiding and mixing mode, fully considers the gas-liquid flow characteristic of the inclined shaft section in the highly-inclined shaft, realizes gas-liquid mixing, improves the liquid carrying capacity, reduces the pressure loss and the like.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.