CN205206774U - Level pressure bailer - Google Patents

Abstract

The utility model relates to a level pressure bailer comprises valves and bailer two parts, wherein, the valves includes constant pressure valve and relief valve, the bailer includes unsteady valve, hydraulic cylinder, lower unsteady valve, piston and garrulous sand head, just it connects gradually to go up the valve that floats, hydraulic cylinder, piston, lower unsteady valve and garrulous sand head, the negative pressure valve is established and is floated between valve and the piston and inside lieing in the hydraulic cylinder last, the lower extreme of valves and the upper end of bailer are connected through a plurality of oil pipe. Compared with the prior art, the utility model discloses it is rational in infrastructure: can the adaptation complicated sand operating mode of dragging for in the pit, the piston produces strong negative pressure with cylinder relative motion, after utilizing the negative pressure to drag for sand, can continue machinery and drag for sand, drags for sand through constantly lifting, transfer the suction, increases the volume of dragging for sand. Thereby make the product more flexible and efficient, increased application range.

Description

Level pressure bailers

Technical field

The utility model relates to the device that a kind of natural gas DH negative pressure drags for sand, specifically a kind of level pressure bailers, is mainly used in fishing for down-hole deposition sand grains to dredge sleeve pipe, belongs to oil equipment field.

Background technology

In construction of natural gas fields process, because well cylinder pressure is lower than strata pressure, natural gas constantly enters in pit shaft from stratum.While natural gas flows in pit shaft, have some reservoir sands and entered pit shaft by natural gas carrier.Along with the passing of recovery time, shaking out can be more and more serious, and the sand grains in pit shaft is piled up gradually, buries payzone, gas output per well is reduced, even stops production.

The size of uncontrollable the produced negative pressure of existing negative pressure sand pumping apparatus, if liquid level is higher in pit shaft, then the negative pressure produced is just larger.When negative pressure bailers drags for sand, in the moment that negative pressure valve is opened, the sand-laden fluid body in pit shaft will be rushed in bailers.If negative pressure is comparatively large, just may exciting stratum, bring out blowout, cause the accident.In addition, it is low that sand efficiency is dragged in conventional mechanical suction, generally do not adopt for deep-well; The sand washing method that oil well is conventional, is not suitable for gas well yet, because a large amount of water rushes in stratum, can causes water logging, and reduce output, the serious gas well that even can cause is scrapped.

Summary of the invention

The utility model, for solving the problem, aims to provide a kind of level pressure bailers.

The technical solution of the utility model is made up of valve group and bailers two parts; Wherein, valve group comprises constant pressure valve and relief valve; Bailers comprises float trap, fluid cylinder, lower float trap, piston and broken sand head; And described upper float trap, fluid cylinder, piston, lower float trap are connected successively with broken sand head; Negative pressure valve to be located between float trap and piston and to be positioned at fluid cylinder inside; The lower end of valve group is connected by some oil pipes with the upper end of bailers.

Wherein, described constant pressure valve comprises the top connection of valve group, and the lower end of described valve group top connection is connected with the lower contact of valve group; Be provided with the cavity of the inside connecting extraneous and the top connection of valve group in the inside of valve group lower contact, the inner of described cavity is provided with plug, and plug is connected by spring and is used for and the extraneous steel ball intercepted.

Wherein, described relief valve comprises spring and overflow lip, and the middle part of described overflow lip is through, and the upper end of overflow lip is provided with the passage connected with the external world, and the upper end of described overflow lip is provided with the steel ball withstood by spring.

Wherein, be also provided with the torque transmission mechanism coordinating to come transmitting torque by the male splined shaft of piston and the inner flower-key body keyway that key overlaps between the key cover that the lower end of piston and fluid cylinder is provided with, described key overlaps and be provided with startup shear pin between piston.

Wherein, described negative pressure valve comprises valve plate pin, spring and flap, and flap seat is connected to the inwall of fluid cylinder, and and be provided with shear pin between fluid cylinder, one of flap is fixed on flap seat by valve plate pin and spring.

Wherein, described upper float trap comprises top connection, upper valve base and flap and touches pipe, the lower end of described top connection connects the upper end of upper valve base, the flap that the lower end of described upper valve base connects touches pipe upper end, be provided with in upper valve base inside and can block the steel ball that top connection, upper valve base and flap touch communicating passage between pipe, be provided with spacing upper lever in the upper end of steel ball.

Wherein, described lower float trap comprises lower valve base, and the upper end of described lower valve base connects the lower end of piston, and the lower end of described lower valve base connects the upper end of broken sand head; Be provided with in lower valve base inside and can block piston, the steel ball of communicating passage between lower valve base and broken sand head, be provided with spacing lower lever in the upper end of steel ball.

Compared to the prior art, the utility model combines negative pressure and drags for sand and aspirate drag for the dual theory structure of sand with machinery, can adapt to more complicated down-hole and drag for sand operating mode; Negative pressure is produced in pipe when wherein negative pressure valve ensures that instrument is gone into the well; Constant pressure valve, for adjusting tubing string inside and outside differential pressure, avoids because producing excessive negative pressure that blowout is brought out on exciting stratum; The liquid of relief valve for releasing in tubing string; Piston, upper float trap form mechanical sand-picking device, for mechanical sand-picking together with lower float trap; Broken sand head is used for the sand scale in broken shaft bottom; Torsion pass structure is used for transmitting torque, is easy to broken sand head and rotates broken sand scale.Piston and fluid cylinder relative motion produce stronger negative pressure, after utilizing negative pressure to drag for sand, can continue mechanical sand-picking, drag for sand, add and drag for sand amount by constantly put-on and delegated suction, and rational in infrastructure, flexible and efficient, the scope of application increases.

Accompanying drawing explanation

Fig. 1 is the structural representation of the valve group of the utility model embodiment.

Be the top connection of valve group see Fig. 1: 18,10 is plug, and 15 is the lower contact of valve group, and 9 is overflow lip, and 14 is spring.

Fig. 2 is the bailers structural representation of the utility model embodiment; The two-stage structure wherein shown in Fig. 2 is one section in fact, and can splice by a dotted line.

Fig. 3 is the sectional view in A-A face in Fig. 2.

See accompanying drawing: 1 is top connection, and 2 is upper pin, and 3 is steel ball, and 4 is upper valve base, 5 is lower contact, and 6 manage for valve plate touches, and 7 is fluid cylinder, 11 is shear pin, and 12 is valve plate seat, and 13 is valve plate pin, 14 is spring, and 16 is flap, and 17 is valve plate frame, 19 is key cover, and 20 is piston, and 21 is lower valve base, 22 is lower stop lever, and 23 is broken sand head, and 24 for starting shear pin.

Detailed description of the invention

Now the utility model is further described by reference to the accompanying drawings.

See Fig. 1, Fig. 2, what Fig. 1, Fig. 2 showed is an embodiment of the present utility model, and combined by valve group and bailers two parts, valve group lower contact 15 is generally connected by ten to three ten oil pipes with the top connection 1 of bailers.

Valve group comprises constant pressure valve and relief valve; Bailers comprises float trap, fluid cylinder 7, lower float trap, piston 20 and broken sand head 23; And described upper float trap, fluid cylinder 7, piston 20, lower float trap are connected successively with broken sand head 23; Negative pressure valve is located between float trap and piston 20 and to be positioned at fluid cylinder 7 inner; The lower end of valve group is connected by 20 oil pipes with the upper end of bailers.

Wherein, described constant pressure valve comprises valve group top connection 18, and the lower end of described valve group top connection 18 is connected with valve group lower contact 15; Be provided with the cavity of the inside connecting extraneous and valve group top connection 18 in the inside of valve group lower contact 15, the inner of described cavity is provided with plug 10, and plug 10 is connected by spring 14 and is used for and the extraneous steel ball 3 intercepted.

Wherein, described relief valve comprises spring 14 and overflow lip 9, and the middle part of described overflow lip 9 is through, and the upper end of overflow lip 9 is provided with the passage connected with the external world, and the upper end of described overflow lip 9 is provided with the steel ball 3 withstood by spring 14.

Wherein, the torque transmission mechanism that the inner flower-key body keyway overlapping 19 by the male splined shaft of piston 20 and key coordinates to come transmitting torque is also provided with between the key cover 19 that the lower end of piston 20 and fluid cylinder 7 is provided with.See Fig. 3, be provided with between described key cover 19 and piston 20 and start shear pin 24.

Wherein, described negative pressure valve comprises valve plate pin 13, spring 14 and flap 16, and flap seat 12 is connected to the inwall of fluid cylinder 7, and and be provided with shear pin 11 between fluid cylinder 7, one of flap 16 is fixed on flap seat 12 by valve plate pin 13 and spring 14, the other end of flap 16 is interposed between on valve plate frame 17.Wherein flap 16 determines the opening and closing of negative pressure valve.

Wherein, described upper float trap comprises top connection 1, upper valve base 4 and flap and touches pipe 6, the lower end of described top connection 1 connects the upper end of upper valve base 4, the flap that the lower end of described upper valve base 4 connects touches pipe 6 upper end, be provided with in upper valve base 4 inside and can block the steel ball 3 that top connection 1, upper valve base 4 and flap touch communicating passage between pipe 6, be provided with spacing upper lever 2 in the upper end of steel ball 3.

Wherein, described lower float trap comprises lower valve base 21, and the upper end of described lower valve base 21 connects the lower end of piston 20, and the lower end of described lower valve base 21 connects the upper end of broken sand head 23; Be provided with in lower valve base 21 inside and can block piston 20, the steel ball 3 of communicating passage between lower valve base 21 and broken sand head 23, be provided with spacing lower lever 22 in the upper end of steel ball 3.

This level pressure bailers is in the process of going into the well, owing to being provided with flap 16, when transferring, in sleeve pipe, hydraulic pressure is greater than hydraulic pressure in oil pipe and forms pressure reduction and continue to increase, when difference is greater than certain setting value, constant pressure valve is opened, for compensating difference between the two, when difference is less than certain setting value, constant pressure valve cuts out.

When bailers goes downwards to down-hole certain position, because the sealed spacer of negative pressure valve creates the pressure reduction of hydraulic pressure in hydraulic pressure and sleeve pipe in oil pipe, under differential pressure action, negative pressure valve and fluid cylinder 7 produce relative motion and produce, and produce shearing force to shear pin 11.When instrument comes downwards to long-pending layer of sand, apply the pressure of the drill of one to two tons, thus piston 20 is descending is obstructed, and makes that negative pressure valve is descending to be obstructed, and continues descending fluid cylinder 7 and produces relative motion and produce and produce shearing force to shear pin 11.

When shearing force summation is greater than setting value, shear pin 11 disconnects, and negative pressure valve and flap touch pipe 6 relative motion, and pushes flap 16 open and overlap 19 to lower floating valve seat and key and contact, and the relative motion that negative pressure valve and flap touch pipe 6 stops and locking.

Piston 20 and fluid cylinder 7 relative motion produce negative pressure, and the floating sand near sand face, shaft bottom is inhaled in bailers.After utilizing negative pressure to drag for sand, can mechanical sand-picking be continued, then drag for sand by constantly put-on and delegated suction, increase and drag for sand amount.Upper lifting pipe post, the upper float trap of bailers cuts out, and lower float trap is opened, and mulling liquid enters in fluid cylinder.Then press down tubing string, lower float trap cuts out, and upper float trap is opened, and the mulling liquid in fluid cylinder is entered in storage sand tube by upper float trap.One single under discharge after, upper lifting pipe post, makes up a joint, and speed wants fast.Owing to being provided with float trap, instrument when upper carrying in sleeve pipe hydraulic pressure to be less than in oil pipe hydraulic pressure and to form pressure reduction and continue to increase, when pressure reduction is greater than setting value, relief valve is opened, hydraulic pressure in release oil pipe, and when difference is less than setting value, relief valve cuts out.

In the utility model, produce negative pressure in pipe when negative pressure valve ensures that instrument is gone into the well, constant pressure valve is for adjusting tubing string inside and outside differential pressure, and the liquid of relief valve for releasing in tubing string, piston 20, upper and lower float trap form mechanical sand-picking device, together for mechanical sand-picking.Broken sand head 23 is for the sand scale in broken shaft bottom, and torsion pass structure is used for transmitting torque and rotates broken sand scale to be easy to broken sand head 23.

The utility model combines negative pressure and drags for sand and aspirate drag for the dual theory structure of sand with machinery, rational in infrastructure: more complicated down-hole to be adapted to and drag for sand operating mode, piston and cylinder barrel relative motion produce stronger negative pressure, after utilizing negative pressure to drag for sand, mechanical sand-picking can be continued, drag for sand by constantly put-on and delegated suction, increase and drag for sand amount.Thus make product more flexible and efficient, increase the scope of application.

Above by reference to the accompanying drawings and embodiment describe embodiment of the present utility model; the structure that embodiment provides does not form restriction of the present utility model; in this area, those skilled in the art can adjust according to needs, make various distortion within the scope of the appended claims or revise all in protection domain.

Claims (7)

1. a level pressure bailers, is characterized in that: be made up of valve group and bailers two parts; Wherein, valve group comprises constant pressure valve and relief valve; Bailers comprises float trap, fluid cylinder, lower float trap, piston and broken sand head; And described upper float trap, fluid cylinder, piston, lower float trap are connected successively with broken sand head; Negative pressure valve to be located between float trap and piston and to be positioned at fluid cylinder inside; The lower end of valve group is connected by some oil pipes with the upper end of bailers.

2. a kind of level pressure bailers according to claim 1, is characterized in that: described constant pressure valve comprises the top connection of valve group, the lower end of described valve group top connection is connected with the lower contact of valve group; Be provided with the cavity of the inside connecting extraneous and the top connection of valve group in the inside of valve group lower contact, the inner of described cavity is provided with plug, and plug is connected by spring and is used for and the extraneous steel ball intercepted.

3. a kind of level pressure bailers according to claim 1 and 2, it is characterized in that: described relief valve comprises spring and overflow lip, the middle part of described overflow lip is through, and the upper end of overflow lip is provided with the passage connected with the external world, and the upper end of described overflow lip is provided with the steel ball withstood by spring.

4. a kind of level pressure bailers according to claim 1, it is characterized in that: be also provided with the torque transmission mechanism coordinating to come transmitting torque by the male splined shaft of piston and the inner flower-key body keyway that key overlaps between the key cover that the lower end of piston and fluid cylinder is provided with, described key overlaps and be provided with startup shear pin between piston.

5. a kind of level pressure bailers according to claim 1 or 4, it is characterized in that: described negative pressure valve comprises valve plate pin, spring and flap, flap seat is connected to the inwall of fluid cylinder, and and be provided with shear pin between fluid cylinder, one of flap is fixed on flap seat by valve plate pin and spring, and the other end of flap is interposed between on valve plate frame.

6. a kind of level pressure bailers according to claim 1 or 4, it is characterized in that: described upper float trap comprises top connection, upper valve base and flap and touches pipe, the lower end of described top connection connects the upper end of upper valve base, the flap that the lower end of described upper valve base connects touches pipe upper end, be provided with in upper valve base inside and can block the steel ball that top connection, upper valve base and flap touch communicating passage between pipe, be provided with spacing upper lever in the upper end of steel ball.

7. a kind of level pressure bailers according to claim 1 or 4, is characterized in that: described lower float trap comprises lower valve base, and the upper end of described lower valve base connects the lower end of piston, and the lower end of described lower valve base connects the upper end of broken sand head; Be provided with in lower valve base inside and can block piston, the steel ball of communicating passage between lower valve base and broken sand head, be provided with spacing lower lever in the upper end of steel ball.