阅读说明：本技术 桥式注抽防砂泵 (Bridge type injection and suction sand-proof pump ) 是由 王飞 杜冰 王静 王争光 金鑫 李永忠 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种桥式注抽防砂泵,包括上下相连接的采油总成和桥式注汽总成两部分；所述的采油总成和桥式注汽总成之间通过抽油杆柱相连接；所述采油总成包括柱塞部分和泵筒部分；所述柱塞部分由上至下依次设有上接头、拉杆、柱塞上罩、游动阀、上罩连接头、柱塞、小阀罩、顶紧头；其中,所述游动阀由一个阀球和一个环形阀座组成,所述柱塞部分包括两套游动阀,即上游动阀和下游动阀,所述上游动阀的阀座位于柱塞上罩中,上罩连接头和柱塞上罩通过螺纹连接,顶紧阀座端面,阀球位于柱塞上罩和阀座形成的独立空间中；本发明的优点在于：降低了频繁修井劳动强度,延长了工作寿命,降低了生产成本。(The invention discloses a bridge type injection and suction sand control pump, which comprises an oil extraction assembly and a bridge type steam injection assembly which are connected up and down; the oil extraction assembly is connected with the bridge type steam injection assembly through a sucker rod string; the production assembly comprises a plunger portion and a pump barrel portion; the plunger part is sequentially provided with an upper joint, a pull rod, a plunger upper cover, a traveling valve, an upper cover connector, a plunger, a small valve cover and a puller head from top to bottom; the plunger part comprises two sets of traveling valves, namely an upper traveling valve and a lower traveling valve, the valve seat of the upper traveling valve is positioned in the plunger upper cover, the upper cover connector is connected with the plunger upper cover through threads and tightly props against the end face of the valve seat, and the valve ball is positioned in an independent space formed by the plunger upper cover and the valve seat; the invention has the advantages that: the labor intensity of frequent well repair is reduced, the service life is prolonged, and the production cost is reduced.)

1. Bridge type injection and suction sand control pump is characterized in that: comprises an oil extraction assembly and a bridge type steam injection assembly which are connected up and down; the oil extraction assembly is connected with the bridge type steam injection assembly through a sucker rod string; the production assembly comprises a plunger portion and a pump barrel portion;

the plunger part is sequentially provided with an upper joint, a pull rod, a plunger upper cover, a traveling valve, an upper cover connector, a plunger, a small valve cover and a puller head from top to bottom; the traveling valve consists of a valve ball and an annular valve seat;

the plunger part comprises two sets of traveling valves, namely an upper traveling valve and a lower traveling valve, a valve seat of the upper traveling valve is positioned in an upper plunger cover, an upper cover connector is connected with the upper plunger cover through threads and tightly props against the end face of the valve seat, and a valve ball is positioned in an independent space formed by the upper plunger cover and the valve seat.

2. The bridge type injection-suction sand control pump according to claim 1, characterized in that: the valve seat and the valve ball of the downstream valve are positioned in the small valve cover.

3. The bridge type injection-suction sand control pump according to claim 1, characterized in that: the pump barrel part is sequentially provided with a sand prevention cover, a sand prevention ring, a pump barrel connector, an upper extension pipe, a pump barrel, a lower extension pipe, a fixed valve, a large valve cover and a fishing sealing part from top to bottom.

4. The bridge type injection-suction sand control pump according to claim 3, characterized in that: the fixed valve is composed of a valve ball and an annular valve seat.

5. The bridge type injection-suction sand control pump according to claim 3, characterized in that: the fishing sealing part is sequentially provided with a sealing mandrel, an extension pipe, an extension joint and a disconnecting track from top to bottom.

6. The bridge type injection-suction sand control pump according to claim 5, characterized in that: an upper spacer ring, a short inner spacer ring, a middle spacer ring, a long inner spacer ring, a lower spacer ring and a spare cap are sequentially arranged outside the sealing mandrel from top to bottom; and a high-temperature sealing ring is arranged outside the short inner spacer ring, and the upper end of the high-temperature sealing ring is connected with the lower end of the upper spacer ring.

7. The bridge type injection-suction sand control pump according to claim 6, characterized in that: the spare cap is connected with the sealing core shaft through threads, and annular parts such as the upper spacing ring, the short inner spacing ring, the middle spacing ring, the long inner spacing ring and the lower spacing ring are tightly propped.

8. The bridge type injection-suction sand control pump according to claim 7, characterized in that: the bridge type steam injection assembly is sequentially provided with an upper buckle changing joint, an upper bridge type steam injection guide pipe, a centering joint, a coupling, an upper bridge type steam injection guide pipe, a lower buckle changing joint and a sealing support lining from top to bottom.

Technical Field

The invention relates to an oil extraction pump of an oil field, in particular to a bridge type injection and suction sand prevention pump, and belongs to the field of oil extraction pumps of oil fields.

Background

The thick oil well adopts a steam injection huff and puff process frequently, so that the viscosity of the thick oil is reduced, and the productivity is improved. However, the injection and extraction dual-purpose tool commonly used at present has the problems that:

1, during steam injection and oil pumping, a medium passes through an inner hole of a pump barrel assembly or other unique channels, and during steam injection, scaling is easy to form on the inner wall, accidents such as plunger clamping and the like occur, or the service life of a sealing working barrel is shortened;

2, during steam injection, high-temperature steam rapidly passes through the pump barrel to cause the pump body to be violently thrown and impact the inner wall of the oil pipe, so that the pump body or the oil pipe is damaged and deformed, and the service life of the whole pipe rod is shortened;

3, during oil pumping, solid impurities such as sand grains in the oil fall into the pump barrel, and sanding and even sand blocking stop accidents are caused.

Disclosure of Invention

In order to solve the problems, the invention designs the bridge type injection and suction sand control pump, which reduces the labor intensity of frequent well repair, prolongs the service life and reduces the production cost.

The technical scheme of the invention is as follows:

the bridge type injection and suction sand control pump comprises an oil extraction assembly and a bridge type steam injection assembly which are connected up and down; the oil extraction assembly is connected with the bridge type steam injection assembly through a sucker rod string;

when the bridge type steam injection assembly is installed, the bridge type steam injection assembly is firstly put into a well, and then the oil pumping rod string is connected with the oil extraction assembly and is put into the bridge type steam injection assembly; the sealing core shaft and the sealing support bushing are covered by a matched limiting seat, and after the two surfaces are jointed, the leather cup is also positioned in the bushing for auxiliary sealing.

The production assembly comprises a plunger portion and a pump barrel portion;

after the plunger part and the pump barrel part are assembled, the pull rod extends out through inner holes of the sand control cover, the sand control ring and the three parts of the pump barrel connector of the pump barrel part, can move axially up and down, but cannot be completely taken out. When the oil extraction assembly is installed in a well, the whole oil extraction assembly can be lifted up only by lifting the upper connector of the plunger part.

The plunger part of the plunger part is provided with an anticorrosive coating on the surface of the plunger and the inner wall of the pump cylinder in the pump cylinder part, and belongs to metal gap sealing after fine grinding processing.

The plunger part is sequentially provided with an upper joint, a pull rod, a plunger upper cover, a traveling valve, an upper cover connector, a plunger, a small valve cover and a puller head from top to bottom;

the traveling valve is composed of a valve ball and an annular valve seat, and the rest parts of the plunger part are shaft parts.

The plunger part comprises two sets of traveling valves, namely an upper traveling valve and a lower traveling valve, a valve seat of the upper traveling valve is positioned in an upper plunger cover, an upper cover connector is connected with the upper plunger cover through threads and tightly props against the end face of the valve seat, and a valve ball is positioned in an independent space formed by the upper plunger cover and the valve seat; under the action of gravity, the valve ball functions as a one-way valve.

In the same manner, the valve seat and ball of the downstream valve are located in a small valve housing.

The rest parts of the plunger part are fixedly connected through threads.

The pump barrel part is sequentially provided with a sand prevention cover, a sand prevention ring, a pump barrel connector, an upper extension pipe, a pump barrel, a lower extension pipe, a fixed valve, a large valve cover and a salvaging sealing part from top to bottom;

the fixed valve is composed of a valve ball and an annular valve seat, and the other parts of the pump cylinder part are shaft parts.

The pump barrel connector is connected with the sand prevention cover through threads to form a closed space, and the sand prevention ring is positioned in the closed space and is floating; when the plunger piston part and the pump cylinder part are assembled, the sand prevention ring is sleeved on the pull rod; under the action of gravity, the sand prevention ring can fall on the end face of the pump barrel connector along the pull rod, so that sand can be prevented from entering the inner space of the pump barrel part through the inner holes of the pull rod and the pump barrel connector, and accidents such as sand grinding, sand blocking and the like caused by accumulation of sand in the clearance between the plunger and the pump barrel are avoided.

The fixed valve comprises a fixed valve ball and a fixed valve cover, and the connection mode and the working principle of the fixed valve are the same as those of the traveling valve.

The other parts of the pump cylinder part are fixedly connected through threads.

Wherein the salvaging sealing part is sequentially provided with a sealing mandrel, an extension pipe, an extension joint and a disconnecting track from top to bottom; all parts of the salvaging sealing part are shaft parts and are fixedly connected through threads.

An upper spacer ring, a short inner spacer ring, a middle spacer ring, a long inner spacer ring, a lower spacer ring and a spare cap are sequentially arranged outside the sealing mandrel from top to bottom; and a high-temperature sealing ring is arranged outside the short inner spacer ring, and the upper end of the high-temperature sealing ring is connected with the lower end of the upper spacer ring.

All parts of the sealing mandrel are shaft parts.

The spare cap is connected with the sealing core shaft through threads, the annular parts of the upper spacing ring, the short inner spacing ring, the middle spacing ring, the long inner spacing ring and the lower spacing ring are tightly propped, and the conical surfaces of the annular parts are in interference fit, so that the sealing effect is realized.

The bridge type steam injection assembly is sequentially provided with an upper buckle changing joint, an upper bridge type steam injection guide pipe, a centering joint, a coupling, an upper bridge type steam injection guide pipe, a lower buckle changing joint and a sealing support lining from top to bottom; all the parts are shaft parts; all parts of the bridge type steam injection assembly are fixedly connected and sealed through threads, and the threads can be conical sealing threads or straight thread end face sealing.

When oil is pumped, the salvaging sealing part is positioned in the sealing support bush and is in a seat sealing state, and the steam injection channel is in a blocking state;

before steam injection, the plunger piston part is directly lifted to drive the pump cylinder part, and finally the salvage sealing part of the oil extraction assembly is separated from the sealing support lining; the steam injection hole is in an open state, and the steam injection channel is opened; steam is injected from the wellhead oil pipe, and then the steam can be injected to the underground oil layer along the oil pipe column.

The steam injection and oil pumping process is realized through a bridge type double channel: during steam injection, steam is injected into the stratum through an annular space between the bridge type steam injection assembly and the oil extraction assembly; when oil is pumped, oil enters the upper-level oil pipe through the middle flow passage of the oil extraction tool; and the inner wall of the pump barrel is prevented from scaling during steam injection, and after steam injection, the plunger is not smoothly operated in the pump barrel and even is frequently clamped.

When steam is injected, the oil extraction assembly is lifted into the bridge type steam injection assembly, and the middle part of the bridge type steam injection assembly is provided with a centering joint. The steam can pass through the steam and the oil extraction assembly can be centered, so that the oil extraction assembly is prevented from being thrown and impacted in the bridge type steam injection assembly when the steam passes through the oil extraction assembly, and the oil extraction assembly is prevented from being damaged and deformed.

The pump barrel part has extension pipe and extension pipe down, and length and plunger cooperation satisfy two purposes:

(1) during oil extraction, when the plunger piston is at the top dead center and the bottom dead center, the whole length of the pump cylinder can be ground, a blank section is prevented, and a new pump cylinder section is blocked with the plunger piston during later-stage well repair or steam injection. In the schematic diagram, the length of the plunger part is 900mm, the length of the upper extension pipe is 900mm, and the length of the lower extension pipe is 400 mm;

(2) when steam is injected, the plunger is lifted to the uppermost end of the pump barrel, a section of plunger is required to be still arranged in the pump barrel, and the traveling valve, the plunger and the pump barrel are matched and sealed to prevent steam from passing through an inner hole of the pump barrel. Preventing scaling.

The pump barrel part is designed with a pump cover, a sand prevention ring and a pump barrel connector, and sand is prevented from depositing in an inner hole of the pump barrel in the oil extraction process, so that sand is prevented from being stuck and sanded.

The salvaging sealing part is provided with a high-temperature sealing ring, and an upper spacing ring, a middle spacing ring, a lower spacing ring, a short inner spacing ring, a long inner spacing ring and other parts are matched to realize long-term stable sealing. If one high-temperature sealing ring is damaged, the axial bouncing of other high-temperature sealing rings cannot be caused, and the integral sealing failure is caused. The lower part of the salvaging sealing part is provided with a disconnecting track which can be matched with a special snubbing oil production tool to finish plugging of underground pressure.

The invention has the beneficial effects that: the labor intensity of frequent well repair is reduced, the service life is prolonged, and the production cost is reduced.

The invention is further illustrated by the following figures and examples.

Drawings

FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of a production assembly according to an embodiment of the present invention;

FIG. 3 is a schematic structural view of a plunger portion according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of a pump barrel portion according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a bridge type steam injection assembly according to an embodiment of the present invention;

FIG. 6 is a detailed structural schematic diagram of a plunger portion according to an embodiment of the present invention;

FIG. 7 is a detailed structural schematic diagram of a pump barrel portion according to an embodiment of the present invention;

FIG. 8 is a schematic diagram illustrating a detailed structure of a bridge-type steam injection assembly according to an embodiment of the present invention;

FIG. 9 is a schematic structural view of a fishing seal according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a tapered surface according to an embodiment of the present invention.

Detailed Description

The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.