CN212656808U - Special piston for fishing liquid machine - Google Patents

Abstract

The utility model provides a drag for special piston of liquid machine by steel cable (1), the steel cable connector, safe nipple joint (4-2), the piston main part, aggravate the nipple joint and constitute, wherein the steel cable connector comprises pressure cap (2), steel cable nut (3), steel cable joint container (4-1), the piston main part comprises the multiunit piston, wherein every group piston comprises dabber (5), right cover (6), seal cover (7), ball seat (8), lower clutch (9), aggravate the nipple joint by female joint (10), it constitutes to add heavy pole (11). A groove is formed between the sealing sleeve (7) and the mandrel (5), the sealing sleeve (7) can be communicated with the upper portion and the lower portion of the sealing sleeve (7) through the groove when the sealing sleeve is not seated on the ball seat (8), and once the overflow in the well occurs, the piston is communicated with the upper portion and the lower portion, so that the pumping safety is guaranteed. The sealing sleeve (7) is seated on the ball seat (8), the upper and lower spaces of the piston can be sealed, the situation that the fishing liquid is seriously leaked downwards is ensured, the fishing liquid efficiency is ensured, and the sealing sleeve is made of wear-resistant metal, so that the service life of the piston is greatly prolonged.

Description

Special piston for fishing liquid machine

Technical Field

The utility model relates to a be used for oil gas field to drag for special piston of liquid machine belongs to oil and gas recovery gas production machinery.

Background

Be applied to the liquid machine of dragging for of low yield oil gas field exploitation has two kinds, oil bailing machine and water bailing machine, drag for the liquid piston and be wherein the most crucial supporting instrument in the pit, current drag for liquid piston form is various, but adopts non-metallic material such as multiple modified nylon, polyurethane as the seal boot material basically, and life is short, and the piston diameter is fixed dimension, and for sealed effect, the clearance of piston and oil pipe internal diameter is very little, and non-metallic material has certain oil encounter water expansibility, and the piston is very easily blocked. The piston is lack of a safety joint, once the piston is blocked, ground equipment cannot be unlocked, only the steel rope is cut off from the ground, then the pipe column is cut off one by one to finally salvage the piston, the operation difficulty is high, time and labor are wasted, and the steel rope with the length of thousands of meters is wasted, so that the loss is very large.

Disclosure of Invention

An object of the utility model is to provide a be applied to the oil field and drag for special piston of liquid machine.

The utility model is realized by the steel rope 1, the steel rope connector, the safety nipple 4-2, the piston main body and the weighting nipple, wherein, the steel rope connector comprises a pressing cap 2, a steel rope nut 3 and a steel rope joint container 4-1, the piston main body comprises a plurality of groups of pistons and a lower joint 9, each group of pistons comprises a central rod 5, a centering sleeve 6, a sealing sleeve 7 and a ball seat 8, the sealing sleeve 7 comprises a pressing cap 12, a mandrel 13, a sealing flap 14 and a spring 15, the weighting nipple comprises a female joint 10 and a weighting rod 11, the end part of the steel rope 1 is provided with a thread buckle, the upper end and the lower end of the steel rope joint container 4-1, the upper end and the lower end of the safety nipple 4-2 and the upper end and the lower end of the central rod 5 are provided with mutually matched threads, the assembling relation is that, the steel rope 1 passes through the central hole of the pressing cap 2 and then is, the steel rope nut 3 is fastened at the end part of the steel rope 1, then the pressing cap 2 is fastened on the steel rope joint container 4-1, the centering sleeve 6, the sealing sleeve 7 and the ball seat 8 are sequentially connected onto the central rod 5 to form a group of pistons, a plurality of groups (1-10 groups, determined according to the well depth) of the pistons are connected with the lower joint 9 to form a piston main body, the safety short section 4-2 is connected between the steel rope connector and the piston main body, the female joint 10 is connected with the weighting rod 11 to form a weighting short section, the female joint 10 and the lower joint (9) are of concave-convex structures which are mutually matched and connected, and the weighting short section is arranged below the piston main body.

The beneficial effects of the utility model are that, safe nipple joint 4-2 is middle necking down structure, and tensile strength is less than ground equipment lifting capacity, and when the piston was blocked, safe nipple joint can be broken, and the steel cable can play ground intact, falls to the minimum with the loss. A plurality of sealing petals 14 form a whole circle, a certain gap is reserved between each sealing petal 14, and a spring 1 is arranged between each sealing petal 14 and a mandrel 13 for supporting, so that the sealing sleeve 7 is ensured to be always in elastic contact with the inner wall of the oil pipe, the sealing is ensured, and the probability that the piston is clamped is reduced to the minimum. The lower part of the mandrel 13 and the ball seat 8 form a sealing structure, a gap and a groove are formed between the central rod 5 and the mandrel 13, the mandrel 13 can be communicated with the upper part and the lower part of the sealing sleeve 7 when the mandrel is not seated on the ball seat 8 through the groove, once the overflow in the well occurs, the piston is communicated up and down, the pumping safety is ensured, the upper space and the lower space of the piston can be sealed after the mandrel 13 is seated on the ball seat 8, the condition that the fishing liquid is not seriously leaked down is ensured, the fishing liquid efficiency is ensured, the sealing flap 14 is made of wear-resistant.

Drawings

FIG. 1 is a structure diagram of a piston dedicated for a liquid fishing machine; fig. 2 is a structure view of a seal cartridge. The present invention will be further explained with reference to the drawings and examples.

Detailed Description

As shown in figures 1 and 2, a piston special for a liquid fishing machine comprises a steel rope (1), a steel rope connector, a safety short section (4-2), a piston main body and a weighted short section, wherein the steel rope connector comprises a pressing cap (2), a steel rope nut (3) and a steel rope joint container (4-1), the piston main body comprises a plurality of groups of pistons and a lower joint (9), each group of pistons comprises a central rod (5), a centering sleeve (6), a sealing sleeve (7) and a ball seat (8), the sealing sleeve (7) comprises a pressing cap (12), a mandrel (13), a sealing flap (14) and a spring (15), the weighted short section comprises a female joint (10) and a weighted rod (11), the end part of the steel rope (1) is provided with a threaded buckle, the upper end and the lower end of the steel rope joint container (4-1), the upper end and the lower end of the safety short section (4-2) and the upper end and the lower end of the central rod (, The assembling relation is that after the steel rope (1) passes through the center hole of the pressing cap (2) and is inserted into the center hole of the steel rope joint container (4-1), the steel rope nut (3) is fastened at the end part of the steel rope (1), then will press cap (2) to tighten to on steel cable joint container (4-1), right set (6), seal cover (7), ball seat (8) connect gradually to constitute a set of piston on well core rod (5), multiunit (1-10 group, according to well depth determination) sub-unit connection lower clutch (9) after the piston connection, constitute the piston main part, safe nipple joint (4-2) are connected between steel cable connector and piston main part, female joint (10) are connected with weight bar (11) and are constituteed and add the nipple joint, female joint (10) and lower clutch (9) are the concave-convex structure of mutually supporting the connection, it is below the piston main part to add the nipple joint. The safety short section (4-2) is of a middle necking structure, a plurality of (2-8) sealing flaps (14) are determined according to the diameter size to form a whole circle, a certain gap is reserved between each sealing flap (14), and a spring (15) is arranged between each sealing flap (14) and the mandrel (13) for supporting. The lower part of the mandrel (13) and the ball seat (8) form a sealing structure, a gap and a groove are formed between the central rod (5) and the mandrel (13), the upper part and the lower part of the sealing sleeve (7) can be communicated through the groove when the mandrel (13) is not seated on the ball seat (8), and the sealing flap (14) is made of wear-resistant metal.

Claims (5)

1. The utility model provides a drag for special piston of liquid machine which characterized in that: the steel cable connector comprises a pressing cap (2), a steel cable nut (3) and a steel cable joint container (4-1), the piston body comprises a plurality of groups of pistons and lower joints (9), each group of pistons comprises a central rod (5), a centering sleeve (6), a sealing sleeve (7) and a ball seat (8), the sealing sleeve (7) comprises a pressing cap (12), a mandrel (13), a sealing flap (14) and a spring (15), the weighting short section comprises a female joint (10) and a weighting rod (11), the end part of the steel cable (1) is provided with a thread buckle, the upper end and the lower end of the steel cable joint container (4-1), the upper end and the lower end of the safety short section (4-2) and the upper end and the lower end of the central rod (5) are provided with mutually matched threads, the assembly relation is that the steel cable (1) penetrates through the pressing cap (2) and then is inserted into the steel cable joint container (4-1) Behind the centre bore, fasten steel cable nut (3) at steel cable (1) tip, then will press cap (2) to tighten on steel cable joint container (4-1), right set (6), seal cover (7), ball seat (8) connect gradually to and constitute a set of piston on well core rod (5), sub-unit connection lower clutch (9) behind the multiunit piston connection, constitute the piston main part, safe nipple joint (4-2) are connected between steel cable connector and piston main part, female joint (10) are connected with accent pole (11) and are constituteed and aggravate the nipple joint, female joint (10) and lower clutch (9) are the concave-convex structure of mutually supporting connection, aggravate the nipple joint below the piston main part.

2. The special piston for the liquid fishing machine as claimed in claim 1, wherein: the safety short section (4-2) is of a middle necking structure, and the tensile strength is lower than the lifting capacity of ground equipment.

3. The special piston for the liquid fishing machine as claimed in claim 1, wherein: a plurality of sealing flaps (14) form a whole circle, a certain gap is reserved between each sealing flap (14), and a spring (15) is arranged between each sealing flap (14) and a mandrel (13) for supporting.

4. The special piston for the liquid fishing machine as claimed in claim 1, wherein: the lower part of the mandrel (13) and the ball seat (8) form a sealing structure, a gap and a groove are formed between the central rod (5) and the mandrel (13), the upper part and the lower part of the sealing sleeve (7) can be communicated through the groove when the mandrel (13) is not seated on the ball seat (8), and the upper space and the lower space of the piston can be sealed after the mandrel (13) is seated on the ball seat (8).

5. The special piston for the liquid fishing machine as claimed in claim 1, wherein: the sealing flap (14) is of wear-resistant metal.

Images