CN2281421Y

CN2281421Y - Underground three phase separator

Info

Publication number: CN2281421Y
Application number: CN 96214503
Authority: CN
Inventors: 胡定青
Original assignee: PETROLEUM MACHINERY PLANT YUHUAN COUNTY
Current assignee: PETROLEUM MACHINERY PLANT YUHUAN COUNTY
Priority date: 1996-05-28
Filing date: 1996-05-28
Publication date: 1998-05-13
Anticipated expiration: 2006-05-28

Abstract

The utility model relates to an underground triphase separator used for separating underground oil, gas and sand during an operation of pumping crude oil carried out by an oil-well pump. The utility model is composed of a central tube, an upper outer tube, a lower outer tube, a filtering joint used for connecting the upper outer tube with the lower outer tube, an upper joint, a lower joint and a dead blocking element, wherein, the central tube is wound with a stream guidance rib, and the upper outer tube is provided with a liquid feeding hole and a sieve tube. The utility model utilizes the sieve tube to filter sand; oil and gas are separated from each other in the upper outer tube through the pumping process of a pump, the gas is discharged from the lower outer tube, and the entering of the oil and the discharge of the gas are alternately carried out, thus, triphase separation to the underground sand, liquid and the gas is realized. The utility model has the advantages of multiple function, convenient maintenance and use, long service life, etc. The utility model can be widely used in a sand well and a casing deformation well.

Description

The down-hole three phase separator

The utility model relates to the kit of oil field strike the oil, during particularly with oil well pump suction crude oil, makes the kit of downhole oil, gas, sand three phase separation.

To the separation of oil, gas, sand three-phase in the crude oil of down-hole, adopt separate oil, gas separating device usually on the present oil field---gas anchor and sand filter, and be coupled on the flow string, perhaps adopt back-off packer to hang on the down-hole.The former, the general using downhole packer separates the liquid in the crude oil, gas, and this separate mode can not be suitable for the oil well of some casing deformations, and when in sand output well, using, sand is piled up on packer top easily, causes the tubing string card stifled, causes difficulty to well workover.The latter, its tubular column structure complexity, flow chart is many, and the construction working amount is big, has influenced operating efficiency.

The purpose of the utility model be to provide a kind of can filter sand, sand setting, can efficiently separate the down-hole three phase separator of gas-liquid again.

The down-hole three phase separator comprises central tube, is enclosed within central tube outer upper exterior tube and lower outer pipe, connects the transition joint of upper and lower outer tube, is contained in the top connection and the lower contact on upper and lower outer tube top respectively, is fixed on dead the blocking up in the lower contact.Be wound with screw type fuisw rib on the central tube outer wall, on the upper exterior tube sidewall inlet opening arranged, inlet opening is with screen casing outward.

The internal diameter of lower outer pipe is greater than the internal diameter of upper exterior tube, and upper exterior tube is separated out gas from crude oil, and lower outer pipe makes and Oil-gas Separation plays the effect of supercharging oil-feed, exhaust.

Fig. 1 is a structural representation of the present utility model.

The down-hole three phase separator is by central tube 2, be enclosed within central tube 2 outer upper exterior tube 6, lower outer pipe 8, screw thread is fixed on the top connection 1 on upper exterior tube 6 and central tube 2 tops and lower contact 9 that is fixed on lower outer pipe 8 bottoms and the transit joint 7 that is connected upper and lower outer tube 6,8 and is contained in and extremely blocks up 10 compositions in the lower contact 10.Central tube 2 outer walls are wound with fuisw rib 4 spirally, and fuisw rib 4 is one with the weldering of central tube 2 tube walls; Have equally distributed inlet opening 3 on the upper exterior tube 6 top perisporiums, be with the screen casing 5 that wrapping wire constitutes on the upper exterior tube 6 outside inlet opening 3, screen casing 5 plays the filter sand effect.

Transition joint 7 tops are shaped on internal thread, and the bottom is shaped on outer spiral shell mosquito, are connected with upper and lower outer tube 6,8 respectively, make the internal diameter of lower outer pipe 8 greater than the internal diameter of upper exterior tube 6.

Central tube 2 bottoms are about 1/3 of lower outer pipe 8 length from the height of lower contact 9, and the gas after can avoiding separating is inhaled in the central tube 2.

Can also be connected to tail pipe between the lower contact 9 and dead stifled 10, be used to deposit the sand that gets off.

The utility model is connected to the lower end use supporting with it of oil well pump, and its operating principle is such: when the plunger of oil well pump was up, the standing valve of pump was opened, live crude is through screen casing 5 slits, the inlet opening 3 of wrapping wire in the well, be inhaled in the upper exterior tube 6, at this moment, the sand in the crude oil is filtered; Because upper exterior tube 6 is thinner, and the gap between the central tube 2 is little, and there is the spiral stream guidance muscle to block, live crude is the high speed rotational flow in upper exterior tube 6, gas is separated out from crude oil, when the gas of separating out and degassed crude enter lower outer pipe 8 in the lump, because of lower outer pipe 8 internal diameters greater than upper exterior tube 6 internal diameters, so its flow velocity sharply reduces, pressure raises, the input pressure of central tube 2 also increases, the program that is full of of pump improves, simultaneously, because of the density of oil ratio gas big, oil accumulates in the bottom of lower outer pipe 8, and gas accumulates on lower outer pipe 8 tops.When the plunger of pump is descending, the standing valve of pump is closed, enter high-speed rotational crude oil in the upper exterior tube 6 under gravity and action of inertia, continue descending a period of time, and the bubbing in the compression lower outer pipe 8, the pipe internal pressure raises, gas is under the effect of pressure, helical duct through fuisw rib 4 is up, and enters sleeve pipe from inlet opening 3, screen casing 5, and gas continues up in sleeve pipe and emits from well head.

Here need to prove: because the diameter of lower outer pipe 8 is bigger than pump barrel diameter, internal volume is also just much bigger than pump barrel volume, therefore, and when the plunger of pump arrives top dead-centre, the liquid level of degassed crude is positioned on central tube 2 imports, so the gas of separating out can not enter in the pump.

Obviously, the utility model utilizes the screen casing filter sand, leans on the suction of pump as oil The power that gas separates by the efflux time of pump, is discharged isolated gas, so that Oil-feed and exhaust hocket, thereby have realized that down-hole sand, liquid, gas separate. It has Following advantage:

1, function is many, but both filter sands, again can divided gas flow, and simplified the tubing string knot Structure has reduced the effect operation, reduces the oil pumping cost.

2, first filter sand, sand setting again can prolong service life of oil well pump.

3, construction technology is simple, easy to operate, use, easy to maintenance.

4, compliance is strong, can use in sand output well, casing deformation well.

Claims

1, a kind of down-hole three phase separator, comprise central tube (2), be enclosed within central tube (2) outer upper exterior tube (6) and lower outer pipe (8), the transit joint (7) that connects upper and lower outer tube (6,8), be contained in the top connection (1) and the lower contact (9) on upper and lower outer tube (6,8) top respectively, it is characterized in that: be wound with screw type fuisw rib (4) on central tube (2) outer wall, have inlet opening (3) on upper exterior tube (6) sidewall, inlet opening (3) is outer to be with screen casing (5), and dead stifled (10) are housed on the lower contact ⑼.

2, down-hole according to claim 1 three phase separator, it is characterized in that: lower outer pipe (8) internal diameter is greater than upper exterior tube (6) internal diameter.

3, down-hole according to claim 1 and 2 three phase separator, it is characterized in that: the distance of described central tube (2) bottom between lower contact (9) is 1/4-1/2 of lower outer pipe (8) length.