CN2564746Y

CN2564746Y - Anti-clogging throttling plug

Info

Publication number: CN2564746Y
Application number: CN 02238405
Authority: CN
Inventors: 朱一斌; 李峰; 郭小群; 姜涛
Original assignee: Sinopec Henan Oilfield Branch Co No 1 Oil Production Plant
Current assignee: Sinopec Henan Oilfield Branch Co No 1 Oil Production Plant
Priority date: 2002-06-06
Filing date: 2002-06-06
Publication date: 2003-08-06
Anticipated expiration: 2012-06-06

Abstract

The utility model relates to an anti-clogging throttling plug for controlling stratified water quantity in a downhole stratified water distributor of a stratified water injection well in an oil field. An anti-clogging throttling device added in a sealing segment of the existing plug is composed of an anti-clogging piston 2, an anti-clogging piston sealing ring 1, an anti-clogging piston spring 5, an anti-clogging piston connecting rod 7 and an anti-clogging valve 10. In the condition of the normal water injection of the water injection well, as pressure in an oil pipe is higher than the that of stratum, the anti-clogging piston 2 drives the anti-clogging piston connecting rod 7 and the anti-clogging valve 10 to push the anti-clogging piston spring 5 down under the push of pressure, the anti-clogging valve 10 enters a passage of a ceramic water faucet 11, a water injection passage in circular hole shape of the ceramic water faucet 11 is changed into an annular water injection passage; the size of the annular passage is decided by the difference value between the internal pressure of the oil pipe and stratum pressure; the stratum with good water absorption has large pressure difference and small annular space, the stratum with poor water absorption has large pressure difference and large annular space; thus the purpose of controlling water injection can be achieved. After the annular passage is clogged and closing well and stopping injection (or backwashing well) are implemented on earth, the compressed anti-clogging piston spring 5 is released (or stratum pressure is higher than the internal pressure of the oil pipe) to push the anti-clogging piston 2 up, the anti-clogging valve 10 is driven to make room for the occupied circular passage of the ceramic water faucet, so the purpose of opening the clogging is achieved. The utility model can reduce the throwing and fetching work of the plug (water faucet), improve testing work efficiency and lower water injection cost.

Description

Anti-blocking throttling blanking plug

One, affiliated technical field

The utility model relates to a kind of blanking plug that is used for the water injection well in oil fields seperated layer water injection, especially can the control hierarchy water injection rate and the blanking plug that stops up of anti-water nozzle.

Two, background technology

At present, the separated-zone water infection oil field amount is to control by the water nozzle of changing blanking plug in the inclined to one side hole of eccentric injection mandrel, separate water injection well down-hole.Pulling and running tool by special use---throw in catcher is pulled the blanking plug of seat in the inclined to one side hole of eccentric injection mandrel out and is dropped in the inclined to one side hole of injection well downhole flow regulator after suitable water nozzle is changed on ground again, reaches the purpose of adjustment and control hierarchy water injection rate.Simultaneously, along with the oil field enters later development, in order to reach the purpose of environmental protection, and make strata pressure remain on reasonable levels, produced-water reinjection is the way of each oil field routine; Because the difficulty of sewerage treatment is very big, injection water quality very easily to the pit shaft corrosion, produces a large amount of graininess foulant, stops up water nozzle, has seriously strengthened the pulling workload of blanking plug.

Three, summary of the invention

The purpose of this utility model is to provide a kind of blanking plug, can be according to the suction situation on stratum, control hierarchy water injection rate; Simultaneously, after the down-hole water nozzle stops up, can finish the water nozzle de-plugging, save loaded down with trivial details water nozzle (blanking plug) pulling work, improve separate water injection well test work efficiency, alleviate the anti-blocking throttling blanking plug of test worker labour intensity by surface shut-in (or reverse well-flushing).

The technical scheme that its technical problem that solves the utility model adopts is: installed anti-blocking throttling arrangement in the seal section of existing blanking plug additional, this anti-blocking throttling arrangement is made up of anti-blocking piston, anti-blocking piston packing, anti-blocking piston spring, anti-blocking piston rod, anti-blocking valve; In the situation of the normal water filling of water injection well, because the pressure in the oil pipe is higher than the pressure on stratum, anti-blocking piston drives anti-blocking piston rod, anti-blocking valve under the promotion of pressure, it is descending to promote anti-blocking piston spring, anti-blocking valve enters ceramic water nozzle passage, ceramic water nozzle garden hole shape waterflood path is become the waterflood path of annular, the size of circular passage is decided by the size of oil pipe internal pressure and strata pressure difference, the stratum that suction is good, pressure reduction is big, and annular space is little, the stratum of suction difference, pressure reduction is big, and annular space is big, thereby can reach the purpose of control water filling; After the circular passage is blocked, after ground enforcement closing well stops annotating (or anti-flushing well), the anti-blocking piston stroking upward of compressed anti-blocking piston spring release (or strata pressure is higher than the oil pipe internal pressure) promotion drives anti-blocking valve and abdicates shared ceramic water nozzle garden shape passage, reaches the purpose of de-plugging.

This utility model has overcome the operation that must frequently implement the water nozzle pulling after dispensing well down-hole water nozzle stops up, has improved the zonal testing work efficiency, has alleviated test worker's labour intensity, has saved a large amount of costs.

Four, description of drawings

Fig. 1 is the structural representation of this utility model.

Among the figure: 1, anti-blocking piston packing 2, anti-blocking piston 3, piston chamber 4, last sealing ring 5, anti-blocking piston spring 6, seal section main body 7, anti-blocking piston rod 8, delivery port 9, lower seal 10, anti-blocking valve 11, ceramic water nozzle 12, water nozzle passage 13, filter screen

Five, the specific embodiment

Gland is filled in the throw in catcher axial prong pressing and sending head, tightened pressing and sending head, force the rubber sleeve in the pressing and sending head tightly to wrap gland, that finishes blanking plug and throw in catcher is connected pinning throw in catcher axial prong.The piano wire rope connects throw in catcher and goes into the well, carry throw in catcher on crossing behind the target zone, after crossing the target zone injection well downhole flow regulator, the throw in catcher main body is carried hanging to discharge opens, transfer throw in catcher, blanking plug is gone in the inclined to one side hole of injection well downhole flow regulator by the throw in catcher guide seat, when the blanking plug seat is gone into the inclined to one side hole of injection well downhole flow regulator, cam by wall surface of the hole partially force rotation guarantee blanking plug smoothly seat go in the middle of the inclined to one side hole, after blanking plug is fully seated in inclined to one side hole, be provided with the groove of return outside the inclined to one side hole around the cam, for cam orientation, trip out throw in catcher, finish the delivery of blanking plug.At this moment, the passage on oil pipe and stratum is sealed by lower seal 9, last sealing ring 4, and the water that injects the stratum can only enter the stratum by delivery port 8 by filter screen 13 by ceramic water nozzle 11.At the stratum that absorbs water, needs the control water yield, because the pressure reduction of tubing pressure and strata pressure is big, the power that acts on the anti-blocking piston 2 is far longer than strata pressure, so anti-blocking piston is promoted the anti-blocking piston spring 5 of compression by the pressure in the oil pipe, drive anti-blocking piston rod 7, anti-blocking valve 10 comes downwards to bottom dead centre, anti-blocking valve 10 enters in the waterflood path of ceramic water nozzle 11, makes anti-blocking valve 10 and ceramic water nozzle 11 form the waterflood path of an annular, reaches the purpose that water filling is controlled in throttling; The suction difference needs to amplify the stratum of water filling, because the pressure in the oil pipe and the pressure reduction of strata pressure are little, the power on the anti-blocking piston 2 of acting on is less than the required power of the anti-blocking piston spring of compression 5, so anti-blocking valve 10 can't enter the waterflood path of ceramic water nozzle 11, guarantee that the water that injects the stratum has enough big passage to inject the stratum.After the water filling annular space is stopped up by foul, only need to stop annotating (or reverse well-flushing) at wellhead shut-in, pressure and strata pressure balance (or strata pressure is greater than tubing pressure) in the oil pipe, compressed anti-blocking piston spring 5 promotes anti-blocking piston 2, drive anti-blocking valve 10 together with anti-blocking piston rod 7, abdicate the waterflood path of shared ceramic water nozzle 11, foul is reversed flushing fluid and takes filter screen 13 out of, ground steadily drives a well, remaining foul in the filter screen 13, before the anti-blocking piston spring 5 of anti-blocking piston 2 compressions, be injected into water and pour the stratum, the pressure that acts in oil pipe on the anti-blocking piston promotes anti-blocking piston 2, compress anti-blocking piston spring 5, drive anti-blocking valve 10 and enter bottom dead centre, force anti-blocking valve 10 and ceramic water nozzle 11 to form the waterflood path of an annular once more, thereby avoid down throw in catcher to pull blanking plug (water nozzle) de-plugging out.

Claims

1, a kind of anti-blocking throttling blanking plug comprises seal section, and positioning section is characterized in that: installed anti-blocking throttling arrangement in seal section additional, anti-blocking throttling arrangement and ceramic water nozzle (11) can form the waterflood path of an annular.

2, anti-blocking throttling blanking plug according to claim 1 is characterized in that: anti-blocking throttling arrangement is made up of anti-blocking piston packing (1), anti-blocking piston (2), anti-blocking piston spring (5), anti-blocking piston rod (7), anti-blocking valve (10).