CN2921266Y - Grouting tool for well completion - Google Patents

Abstract

The utility model discloses a tool used for grouting of completion, which comprises an external sleeve, a seal ring, a sliding sleeve and a pin. The shell-shaped external sleeve is provided with threads for connection on both upper and lower ends and with holes on lower part. With seal rings arranged its both on upper and lower ends, the sliding sleeve is arranged inside the external sleeve. The pins are connected with the lower part of the external sleeve. Base on principle of connected vessels, course of grouting is completed by filling liquids in well into the sleeve through the holes on the external sleeve. Shaft wall cementing is carried out by nipping off the pins to move the sliding sleeve downwards and to cover the holes on the external sleeve. With the tool, the casing running particularly for deep oil well can be performed continuously and completed one time; thereby working cycle and labour intensity are reduced greatly. With advantages of safety, reliability and simple operations, the utility model mechanizes grouting operations, promotes quality of shaft wall cementing meanwhile saves cost for well drilling.

Description

A kind of completion grouting instrument

Technical field

The utility model relates to can realize in the oil drilling completion process that automatic grouting finishes the improvement of the downhole tool of well cementing operation.

Technical background

At present, the casing job in China's oil system drilling process mostly adopts original fixed mode, guide shoe+back pressure valve+frame modes such as bunch tube, promptly every sleeve pipe of some is down all wanted supporting Guan Zhongyi intubate, by means of this intubate manual grouting once, make under the sleeve pipe in well.Like this, not only duty cycle long, labour intensity is big, particularly heavy duty service.And the pause in the setting of casing process also very easily causes accidents such as sticking cutting ferrule pipe, and the manual grouting utmost point is not easy to judge the use amount of grouting, and causing has residual mud on the rig floor, contaminated environment, and very easily cause accident such as tumble injury; Also may produce because the interior grouting of sleeve pipe is discontented, and lowering velocity is too fast, cause to press and leak the stratum, sleeve pipe is crowded flat, crack, even cause down-hole accident.

Summary of the invention

The purpose of this utility model is to provide a kind of safe and reliable completion grouting instrument for the oil well cementing operation.Well cementing operation is finished like this, after the setting of casing end of job, connect cementing truck and irritate upward cement, wash back pressure valve open, the cement in the sleeve pipe is returned in the annular space of the sleeve pipe and the borehole wall, when cement reaches when returning the high position, use a plug, in sleeve pipe, squeeze into, so that the cement paste in the cleaning sleeve pipe by water pressure, at this moment, back pressure valve is closed.But because shaft bottom situation complexity, the distortion of nylon valve ball or in the process of cement repatriation, spring very easily is damaged, and one way valve can occur can not close, and causes cement to return, make sleeve pipe Nei Liusai too high, cause and bore plug again, increased drilling cost greatly, cause great economic loss, directly influenced the quality of well cementation, serious also can cause the accident.

The utility model is achieved in that overcoat is a tubular, and upper and lower side all is processed with thread, and the bottom is porose, and will be processed into the conical surface in the phase, and sliding sleeve is installed in middle part in the overcoat, and upper and lower side is equipped with sealing ring, and the bottom is connected with overcoat by pin.Sliding sleeve is a cylinder, and bell mouth shape is processed into down in the lower end.

This completion grouting instrument can utilize original well liquid in the well, realizes grouting automatically, the operation of being in the milk of need not stopping, and can effectively control the grouting consumption, make sleeve pipe smoothly down in well.In well cementation completion process, can in time reliably close, cement can not be returned.This instrument makes casing job can realize working continuously, and once finishes, and especially heavy duty service has significantly reduced the work period, and has reduced working strength of workers.This instrument is safe and reliable, and is simple to operate, makes the grouting operation realize mechanization.And improved cementing quality, promptly save time and laborsaving, and saved expense greatly.

Description of drawings: Fig. 1, a kind of completion grouting instrument schematic diagram

1, overcoat 2, sealing ring 3, sliding sleeve 4, pin 5, hole

The specific embodiment

Now the utility model will be further described in conjunction with Figure of description 1.During casing job, a kind of automatic grouting instrument described in the utility model is connected with sleeve pipe after drillng operation is finished, in well, by the hole on the overcoat 15, the well liquid in the well enters into sleeve pipe down, to keep the inside and outside differential pressure unanimity, prevents from that sleeve pipe from being squeezed to ruin.Along with sleeve pipe the increasing of quantity of going into the well, according to the Communicating device principle, the well liquid in the well can be easily by hole 5 pipes on the overcoat 1 in sleeve pipe, make sleeve pipe smoothly down to the shaft bottom.The utility model makes casing job can realize working continuously, and once finishes.Thereby, significantly reduced the work period, particularly in heavy duty service; And can greatly reduce working strength of workers.Owing to need not be in the milk, so the well site cleaning from rig floor.The utility model is safe and reliable, and is simple to operate, makes the grouting operation realize mechanization.

In well cementing operation, when reaching, cement returns when high, in sleeve pipe, squeeze into plug by water pressure, when pump pressure reached authorized pressure, the pin 4 that connects overcoat in the utility model was cut off, and sliding sleeve 3 is descending, and coverage hole 5 can not return cement, to guarantee cementing quality.The top and bottom in hole 5 guarantee that hole 5 is closed by two sealing rings 2, and the lower end of overcoat 1 is the conical surface, and are when descending that it is stuck at home to guarantee sliding sleeve 3, sliding sleeve 3 can not be moved up and down, even there is return pressure to guarantee that also hole 5 is closed.Like this, just improved the quality of well cementation greatly, and, safe and reliable, the phenomenon that cement returns can not appear, significantly reduced drilling cost.

Claims (3)

1, a kind of completion grouting instrument, form by overcoat (1), sealing ring (2), sliding sleeve (3), pin (4), it is characterized in that overcoat (1) is a tubular, upper and lower side all is processed with thread, bottom processing is porose, sliding sleeve (3) is installed in middle part in the overcoat (1), and upper and lower side is equipped with sealing ring (2), and the bottom is connected with overcoat (1) by pin (4).

2, a kind of completion grouting instrument according to claim 1 is characterized in that, is processed with the conical surface in the bottom of overcoat (1).

3, a kind of completion grouting instrument according to claim 1 is characterized in that sliding sleeve (3) is one cylindric, and bell mouth shape is processed into down in the lower end.

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