Underground oil-water separator capable of being thrown and fished

Abstract

The invention discloses an underground oil-water separator capable of being thrown and fished. A fishing head is arranged on the periphery of the upper end of the outer sleeve; the liquid inlets are uniformly distributed in the middle upper part of the outer sleeve in the radial direction and are used for allowing liquid to enter the outer sleeve; the center rod is arranged in the outer sleeve and located in the middle of the outer sleeve, a spiral piece is arranged on the periphery of the center rod, a liquid passing channel is formed in the spiral piece, and the liquid passing channel communicates with the center rod; the oil outlet pipe is arranged in the outer sleeve, the lower end of the oil outlet pipe is connected with the center rod, and an oil outlet is formed in the upper end of the oil outlet pipe; and the water outlet nozzle is arranged at the lower end of the outer sleeve and is used for discharging the separated water. The oil-water separator has the beneficial effects that the center rod is arranged in the outer sleeve, the spiral piece is arranged on the periphery of the center rod, the liquid passing channel is formed in the center rod, oil-water separation can be carried out, separated oil is discharged through the oil outlet, and separated water is discharged through the water outlet nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of petrochemical industry, and in particular to a downhole oil-water separator that can be cast and retrieved. Background Art

[0002] With the continuous exploitation of offshore oil fields, the problem of high water content in production oil fields is becoming increasingly serious. Various forms of water control technologies are constantly emerging. Among them, although downhole oil-water separation technology can effectively solve the problem of high water content in oil fields, there are problems such as the lack of suitable reinjection layers and difficulties in well and layer selection. It cannot be promoted and applied on a large scale, which restricts the effective implementation of this technology.

[0003] At present, there are many combined production and injection wells. In the injection wells, there are still high-yield oil layers that need to continue to produce oil, and other layers are injected. The pipe string has problems such as wellhead modification and high difficulty in double-pipe safety control. Downhole oil-water separation and reinjection technology pipe strings can be used to replace the original combined production and injection and other one-well multi-purpose pipe strings to reduce the oil content of reinjection water. However, since the pipe string needs to be moved and the downhole oil-water separation and reinjection pipe string needs to be re-inserted, the operation and supporting tool costs are high and the economic benefits are poor. Summary of the invention

[0004] The object of the present invention is to provide a throwable downhole oil-water separator, wherein a center rod is arranged inside an outer sleeve, spiral sheets are arranged on the periphery of the center rod, and liquid passages are arranged inside the spiral sheets, so as to separate oil and water, discharge the separated oil through an oil outlet, and discharge the separated water through a water outlet.

[0005] To achieve the above object, the present invention adopts the following technical solutions, including:

[0006] An outer sleeve, the upper end of which is provided with a fishing head;

[0007] A plurality of liquid inlets, which are evenly distributed radially in the middle and upper part of the outer sleeve, for allowing liquid to enter the inner part of the outer sleeve;

[0008] A center rod, which is arranged in the outer sleeve and located in the middle of the outer sleeve, a spiral sheet is arranged on the outer periphery of the center rod, a liquid passage is arranged inside the spiral sheet, and the liquid passage is communicated with the center rod;

[0009] An oil outlet pipe is arranged in the outer sleeve, the lower end of the oil outlet pipe is connected to the center rod, and the upper end of the oil outlet pipe is provided with an oil outlet;

[0010] A water outlet nozzle is arranged at the lower end of the outer sleeve and is used for discharging the separated water.

[0011] Preferably, an upper sealing packing and a lower sealing packing are respectively provided at the upper part and the lower part of the outer circumference of the outer sleeve.

[0012] Preferably, a retractable lock core is provided at the fishing head.

[0013] Preferably, the water outlet nozzle is detachably connected to the lower end of the outer sleeve.

[0014] Preferably, the water outlet nozzle is provided with multiple models for achieving adjustment of different diversion ratios.

[0015] The beneficial effects of the present invention are as follows: a center rod is arranged inside the outer sleeve, a spiral sheet is arranged on the periphery of the center rod, and a liquid passage is arranged inside the spiral sheet, so that oil and water can be separated, and the separated oil is discharged through the oil outlet, and the separated water is discharged through the water outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of a downhole oil-water separator that can be cast and salvaged.

[0017] Figure 2 It is a three-dimensional diagram of the spiral sheet in the present invention.

[0018] Figure 3 It is a three-dimensional diagram of the water outlet in the present invention. DETAILED DESCRIPTION

[0019] The invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0020] It should be understood that terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or other elements or combinations thereof.

[0021] like Figure 1-3 As shown, a downhole oil-water separator 1 that can be cast and salvaged according to the present invention comprises:

[0022] A fishing head 120 is provided on the outer periphery of the upper end of the outer sleeve 110 .

[0023] A plurality of liquid inlets 111 are evenly distributed radially in the middle and upper portion of the outer sleeve 110 for allowing liquid to enter the interior of the outer sleeve 110 .

[0024] The center rod 130 is arranged in the outer sleeve 110 at the middle of the outer sleeve 110 . A spiral sheet 131 is provided on the outer periphery of the center rod 130 . A liquid passage 132 is provided inside the spiral sheet 131 . The liquid passage 132 is connected to the center rod 130 .

[0025] The oil outlet pipe 133 is disposed in the outer sleeve 110 , the lower end of the oil outlet pipe 133 is connected to the center rod, and the upper end of the oil outlet pipe is provided with an oil outlet 134 .

[0026] A water outlet 140 is disposed at the lower end of the outer sleeve 110 and is used to discharge the separated water.

[0027] During use, the liquid to be separated from the water and oil enters the outer sleeve 110 through the liquid inlet 111, and the spiral blade 131 rotates under the impact of the water flow to generate centrifugal force. The oil and water are separated under the action of the centrifugal force. The water is close to the inner wall of the outer sleeve 110, and the oil gathers around the center rod 130 to form an oil core. Since a liquid passage 132 is provided in the center of the spiral blade to connect the center rod 130, the oil core enters the center rod 130 under pressure and is lifted upward, and the separated water flows downward through the water outlet 140.

[0028] In another embodiment, an upper sealing packing 151 and a lower sealing packing 152 are respectively provided at the upper part and the lower part of the outer circumference of the outer sleeve 110 .

[0029] In another embodiment, a retractable lock core 121 is provided at the fishing head 120 .

[0030] In another embodiment, the water spout 140 is detachably connected to the lower end of the outer sleeve 110. Preferably, the water spout 140 is connected to the lower end of the outer sleeve 110 by threads. More preferably, a through mounting hole is radially provided on the water spout 140, and a blind hole corresponding to the through mounting hole is provided on the outer sleeve 110, and the locking screw passes through the through mounting hole and is inserted into the blind hole to achieve the connection between the water spout 140 and the outer sleeve 110.

[0031] In another embodiment, the water outlet nozzle 140 is provided with multiple models for adjusting different diversion ratios.

[0032] In summary, the present invention is a throwable downhole oil-water separator 1, wherein a center rod 130 is provided in an outer sleeve, a spiral sheet 131 is provided on the periphery of the center rod 130, and a liquid passage is provided inside the spiral sheet 131, so as to separate oil and water, discharge the separated oil through the oil outlet 134, and discharge the separated water through the water outlet 140.

[0033] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A downhole oil-water separator that can be cast and salvaged, characterized in that: include: An outer sleeve, the upper end of which is provided with a fishing head; A plurality of liquid inlets, which are evenly distributed radially in the middle and upper part of the outer sleeve, for allowing liquid to enter the inner part of the outer sleeve; A center rod, which is arranged in the outer sleeve and located in the middle of the outer sleeve, a spiral sheet is arranged on the outer periphery of the center rod, a liquid passage is arranged inside the spiral sheet, and the liquid passage is communicated with the center rod; An oil outlet pipe is arranged in the outer sleeve, the lower end of the oil outlet pipe is connected to the center rod, and the upper end of the oil outlet pipe is provided with an oil outlet; A water outlet nozzle is arranged at the lower end of the outer sleeve and is used for discharging the separated water.

2. The castable downhole oil-water separator according to claim 1 is characterized in that: An upper sealing packing and a lower sealing packing are respectively arranged at the upper part and the lower part of the outer circumference of the outer sleeve.

3. The castable downhole oil-water separator according to claim 1 or 2, characterized in that: A retractable lock core is arranged at the fishing head.

4. The castable downhole oil-water separator according to claim 1 is characterized in that: The water outlet nozzle is detachably connected to the lower end of the outer sleeve.

5. The castable downhole oil-water separator according to claim 4 is characterized in that: The water outlet nozzle is provided with various models for realizing the adjustment of different diversion ratios.

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