CN215949787U - Sand-proof device for oil-well pump - Google Patents

Abstract

The utility model discloses a sand prevention device of an oil well pump, which is structurally characterized in that a sand storage cylinder is connected to the lower end of an oil pipe, the sand storage cylinder is in a bottle shape, namely the outer diameter of the upper end of the sand storage cylinder is smaller, the inner part of the sand storage cylinder is hollow, an internal thread at the lower end of the sand storage cylinder is connected with an external thread of a valve seat, an annular space is formed between the sand storage cylinder and the external thread, a thin extension cylinder is arranged at the upper part of the valve seat, the upper end of the extension cylinder is in a bell mouth shape, a plurality of liquid outlet holes are formed in the upper part of the extension cylinder, two symmetrical wrench holes are formed in the lower end of the valve seat, and a screw hole formed in the central position of the bottom of the valve seat is connected with the upper end of a pump cylinder; a pull rod vertically arranged in the oil pipe penetrates through the sand blocking cap, the large end of the sand blocking cap faces downwards, and the piston is connected with the pull rod through threads and then extends into the pump cylinder. The utility model has the beneficial effects that: simple structure, installation convenient to use, during the use, only need lift traditional oil-well pump's top connection off, install storage sand section of thick bamboo, disk seat, piston cap and just can effectively block impurity entering pump barrel, fluid is discharged and is constantly lifted to ground pipeline system from going out the liquid hole.

Description

Sand-proof device for oil-well pump

Technical Field

The utility model belongs to the technical field of oil well pump sand prevention, and particularly relates to a sand prevention device for an oil well pump.

Background

In the production process of an oil well, pump clamping faults often occur, the pump clamping faults mean that a piston is clamped in a pump barrel and cannot do reciprocating motion, or the piston cannot enter the pump barrel, and the main reasons can be divided into three conditions: the first is that the iron filings clamp the pump, in the process of workover operation, the operation worker twists the oil rod or the oil pipe by using the pipe tongs or the hydraulic tongs, because the screw thread needs high torque to rotate, the iron filings drop very easily, once the iron filings drop into the oil pipe, the iron filings can only enter the pump barrel, because the piston can smoothly enter the design requirement of the pump barrel, the joint of the pump barrel is funnel-shaped, so the iron filings also smoothly enter the pump barrel and are clamped in the annular groove on the piston; secondly, the sediment is blocked by the pump, the sediment can be divided into a plurality of kinds, firstly, impurities mainly comprising ferric oxide fall to the bottom of the well after the wall of the casing pipe is oxidized, secondly, metal powder generated by long-term eccentric wear of the oil pipe of the oil rod, sediment at the bottom of the well and the like enter the pump barrel together with the oil, and the sediment and the oil are continuously lifted to the ground. Especially when the well is stopped, such as power failure, motor failure, polished rod breakage, rod breakage and intermittent production well, in the process of stopping the well, precipitates and scrap iron which originally continuously rise along with oil lose rising power, and the specific gravity is larger than that of the oil which naturally sinks into the pump barrel to block the pump barrel, so that the pump is blocked; and thirdly, a piston with a calcified substance falling off is buried to cause pump blockage, because the oil well enters a high water-cut period, the oil produced by the stratum contains higher mineral substances such as calcium, magnesium ions and carbonate, the calcified substance is formed by long-term scouring on the wall of an oil rod and the wall of an oil pipe, and the calcified substance falls off after the oil rod and the oil pipe are vibrated to a certain thickness to cause pump blockage. In addition, the design difference between the outer diameter of the pump barrel and the inner diameter of the piston is 70 microns, the design meets the requirement of high pump efficiency, the friction coefficient between the piston and the pump barrel is reduced, fine particles can enter the gap to cause pump clamping, when the pump clamping fault is lifted and unlocked, the oil rod is required to be reversed in the specified lifting tonnage, the oil rod reversing operation is one of dangerous underground operations, and great potential safety hazards exist. In addition, the back-off operation can not utilize the striking bleeder to let out oil, can cause serious environmental pollution and wasting of resources.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide the sand prevention device for the oil well pump, which has the advantages of simple structure, convenience in installation and use and obvious sand prevention effect, aiming at the defects in the prior art.

In order to achieve the purpose, the technical scheme adopted by the utility model is that the sand prevention device of the oil well pump comprises a sand storage cylinder, a sand blocking cap, a valve seat, a pull rod, an oil pipe, a piston and a pump cylinder, wherein the lower end of the oil pipe is connected with the sand storage cylinder, the sand storage cylinder is in a bottle shape, namely, the outer diameter of the upper end of the sand storage cylinder is smaller, the inner part of the sand storage cylinder is hollow, internal threads at the lower end of the sand storage cylinder are connected with external threads of the valve seat, an annular space is formed between the sand storage cylinder and the external threads, a thin extension cylinder is arranged at the upper part of the valve seat, a horn mouth is arranged at the upper end of the extension cylinder, a plurality of liquid outlet holes are radially arranged at the upper part of the extension cylinder, two symmetrical wrench holes are arranged at the lower end of the valve seat, the bottom of the valve seat is connected with the upper end of the pump cylinder through threads, the pull rod vertically arranged in the oil pipe penetrates through the sand blocking cap, the big end of the sand blocking cap is downward, the aperture of the sand blocking cap is slightly larger than the outer diameter of the pull rod, the pull rod is in a movable state, the pull rod is connected with the piston through the screw thread and then extends into the pump cylinder, the inner lower end of the piston and the inner lower end of the pump cylinder are respectively connected with a traveling valve and a fixed valve through threads in a sealing mode, and oil enters the pump cylinder through the fixed valve and then enters the oil pipe through the traveling valve and the piston.

The utility model has the beneficial effects that: the utility model has simple structure and convenient installation and use, when in use, the upper joint of the traditional oil well pump is only needed to be detached, and the sand storage cylinder, the valve seat and the piston cap are installed, the sand blocking cap is always positioned at the upper end of the extension cylinder during normal work, so that impurities are effectively prevented from entering the pump cylinder, and oil is discharged from the liquid outlet hole and is continuously lifted to a ground pipeline system.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a partial schematic view of an extension cartridge of the present invention.

The labels in the figure are: 1-a sand storage cylinder; 2-a sand blocking cap; 3-valve seat; 301-an extension tube; 302-liquid outlet holes; 303-spanner holes; 304-a bell mouth; 4-a pull rod; 5-oil pipe; 6-a piston; 601-swimming valve; 7-a pump cylinder; 701-fixed valve.

Detailed Description

The following embodiments of the present invention will be described in detail with reference to the accompanying drawings to assist those skilled in the art in more complete, accurate and thorough understanding of the concept and technical solution of the present invention.

The sand prevention device for the oil well pump shown in the figure 1-2 comprises a sand storage cylinder 1, a sand blocking cap 2, a valve seat 3, a pull rod 4, an oil pipe 5, a piston 6 and a pump cylinder 7, wherein the lower end of the oil pipe 5 is connected with the sand storage cylinder 1, the sand storage cylinder 1 is in a bottle shape, namely, the outer diameter of the upper end of the sand storage cylinder is smaller, the inner part of the sand storage cylinder is hollow, internal threads at the lower end of the sand storage cylinder 1 are connected with external threads of the valve seat 3, an annular space is formed between the internal threads and the external threads, a thin extension cylinder 301 is arranged at the upper part of the valve seat 3, the upper end of the extension cylinder 301 is provided with a horn mouth 304, a plurality of liquid outlet holes 302 are radially arranged at the upper part of the extension cylinder, two symmetrical wrench holes 303 are arranged at the lower end of the valve seat 3, a screw hole arranged at the central position of the bottom of the valve seat 3 is connected with the upper end of the pump cylinder 7 through threads, and both thread sealing and end face sealing can be adopted; a pull rod vertically arranged in the oil pipe penetrates through the sand blocking cap, the big end of the sand blocking cap faces downwards, the aperture of the sand blocking cap is slightly larger than the outer diameter of the pull rod,

the movable oil pump is characterized in that the pull rod is in a movable state, the pull rod is connected with the piston through threads and then extends into the pump cylinder, the inner lower end of the piston and the inner lower end of the pump cylinder are respectively connected with a traveling valve and a fixed valve through threads in a sealing mode, and oil enters the pump cylinder through the fixed valve and then enters the oil pipe through the traveling valve and the piston.

In the preferred embodiment, when an oil well with stroke greater than 2.4 meters needs to be installed, a pump cylinder with stroke greater than 3.6 meters is matched. In the preferred embodiment, the sand blocking cap 2 is arranged at the upper end of the extension barrel 301 in normal operation, and the lower part of the oil pipe is not at the same height with the oil pipe, so that the sand blocking cap and the sand storage barrel form a relatively abundant annular space, and sufficient space for iron chips and impurities to pass through is formed in the sand storage barrel.

During the use, will store up sand section of thick bamboo 1 and 3 threaded connection of disk seat, disk seat 3 again with 7 threaded connection of pump barrel, it is for use to keep off sand cap 2, 1 upper end connection oil pipe 5 of the well-packed sand section of thick bamboo of storage goes into the well down, until going down the assigned position, penetrate the sand cap 2 of keeping off with pull rod 4 again and pass through threaded connection piston 6, keep off the sand cap because the factor of gravity can fall down the position that pull rod and piston are connected naturally, then in going into the oil pipe with pull rod and piston down, because keep off sand cap 2 can play the effect of righting the piston, and extension section of thick bamboo 301 upper end is the horn mouth structure, in addition 6 lower extremes of piston are the microcephaly, piston 6 just can get into the pump barrel smoothly in, can not collide with the nozzle department at extension section of thick bamboo 301. The long 3.6 meters of general pump barrel, the piston is long 1.2 meters, if certain well stroke 1.8 meters, the scour protection is apart from the adjustment and is suitable, piston 6 can not push up when reciprocating motion and keep off the sand cap, lift fluid, discharge from radial play liquid hole, even if deposit such as impurity also can be blockked to the annular space that stores up in the sand barrel 1 by keeping off the sand cap when shutting down the well, do not have the chance to get into extension section of thick bamboo 301, thereby avoid appearing the card pump trouble, the extension oil well is exempted from the maintenance period, reduce oil recovery cost.

The above is a description of the present invention and its embodiments, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should, without departing from the spirit of the present invention, devise similar structural modes and embodiments without inventively designing them, and shall fall within the scope of the present invention.

Claims (4)

1. The utility model provides an oil-well pump sand control device, includes sand storage cylinder (1), keeps off sand cap (2), disk seat (3), pull rod (4), oil pipe (5), piston (6), pump cylinder (7), its characterized in that: oil pipe (5) lower extreme be connected with and store up sand section of thick bamboo (1), the internal thread connection of storing up sand section of thick bamboo (1) lower extreme the external screw thread of disk seat (3), form annular space between the two, disk seat (3) lower extreme be equipped with wrench hole (303) of two symmetries, disk seat (3) bottom is connected through the screw thread with pump barrel (7) upper end, adopt thread seal or end face seal all can, oil pipe (5) in vertically placed pull rod (4) pass and keep off sand cap (2), pull rod (4) pass through the screw thread with piston (6) connect the back and stretch into in the pump barrel (7).

2. The sand control device of the oil well pump according to claim 1, which is characterized in that: valve seat (3) upper portion be equipped with thin extension section of thick bamboo (301), extension section of thick bamboo (301) upper end is horn mouth (304), and radially seted up a plurality of liquid hole (302) on extension section of thick bamboo upper portion.

3. The sand control device of the oil well pump according to claim 1, which is characterized in that: the inner lower end of the piston (6) and the inner lower end of the pump barrel (7) are respectively connected with a traveling valve (601) and a fixed valve (701) through threads in a sealing mode, oil enters the pump barrel (7) through the fixed valve (701) and then enters the oil pipe (5) through the traveling valve (601) and the piston (6).

4. The sand control device of the oil well pump according to claim 1, which is characterized in that: the sand storage cylinder (1) is bottle-shaped, namely the outer diameter of the upper end is smaller, and the inside is hollow.

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