CN115977590A - Inner cone cylinder type sand control screen pipe - Google Patents

Abstract

The invention relates to an inner cone cylinder type sand control screen pipe. The main problem of the silt particle composition that can't filter among the fracturing sand and the oil-well pump causes the sand card of current sand control screen pipe of solving. The method is characterized in that: and a plurality of ceramic filter element assemblies (4) are arranged inside the sieve tube outer cylinder (3). The inner cone cylinder type sand control screen pipe can filter silt in fracturing sand before the silt enters the oil well pump cylinder, and normal production of an oil well after fracturing is guaranteed.

Description

Inner cone cylinder type sand control screen pipe

Technical Field

The invention relates to the field of sand control after oil field fracturing, in particular to an inner cone drum type sand control screen pipe.

Background

Oil well fracturing is one of the important measures for increasing the yield of an oil field, and generally has the phenomenon of sand return after the oil well is put into operation or production is recovered after fracturing, and fracturing sand flows into a shaft from a stratum along with oil. In order to prevent fracturing sand from entering an oil well pump to cause sand blocking and affecting the lifting effect of the oil pumping unit, the fracturing sand is filtered by adopting a mode of connecting a sand control screen pipe under the oil well pump at present, the oil well pump is guaranteed not to be affected by the fracturing sand, and the oil well pump can run normally and stably.

However, with the development of oil fields, a large-scale fracturing mode is often adopted for the development of compact oil, the injection amount of fracturing sand is greatly increased, and the phenomenon of serious sand return frequently occurs after the production of a fracturing well. The fracturing sand returns into a shaft from the stratum, and although most of the fracturing sand can be filtered out by the conventional sand control screen pipe, silt and sand components in the fracturing sand cannot be filtered out, so that the fracturing sand is produced.

Disclosure of Invention

In order to overcome the defect that the conventional sand control screen pipe cannot filter silt components in fracturing sand to cause oil well pump sand blockage, the invention provides the inner cone type sand control screen pipe which can filter the silt in the fracturing sand before the silt enters an oil well pump cylinder, so that normal production of an oil well after fracturing is ensured.

The technical scheme of the invention is as follows: an inner cone cylinder type sand control screen pipe comprises a screen pipe upper joint and a screen pipe lower joint, wherein a screen pipe outer cylinder is connected between the screen pipe upper joint and the screen pipe lower joint, and a plurality of ceramic filter element assemblies are arranged inside the screen pipe outer cylinder.

The ceramic filter element assembly comprises a filter element outer shell and a filter element inner shell, and a ceramic filter element is arranged between the filter element outer shell and the filter element inner shell; the filter element outer shell is provided with a filter element outer shell liquid inlet gap, and the filter element inner shell is provided with a filter element inner shell liquid outlet gap.

The liquid inlet gap of the outer filter element shell is positioned above the liquid outlet gap of the inner filter element shell.

The filter element inner shell is conical, the liquid outlet gap of the filter element inner shell is positioned at one end with the large diameter of the filter element inner shell, and the liquid inlet gap of the filter element outer shell corresponds to one end with the small diameter of the filter element inner shell.

And the two ends of the filter element outer shell and the filter element inner shell are respectively connected with the shell upper cover and the shell lower cover.

The invention has the following beneficial effects: by adopting the scheme, the combination of the filter element outer shell liquid inlet gap, the ceramic filter element and the filter element inner shell liquid outlet gap is utilized, so that the fracturing sand carried in the oil and a very small amount of silt components contained in the fracturing sand can be filtered; the oil liquid adopts a top-in bottom-out design mode, the oil liquid enters from a liquid inlet gap of the filter element outer shell, passes through the ceramic filter element and then enters into a conical channel in the ceramic filter element assembly from a liquid outlet gap of the filter element inner shell, the height of the ceramic filter element is fully utilized, and the length of a fracturing sand filtering path is increased; the design of the interior cone cylinder of ceramic filter core and filter core inner shell, cooperation filter core outer shell feed liquor gap and the setting in filter core inner shell play liquid gap, make fluid flow velocity of flow increase suddenly when flowing through filter core inner shell top, and the pressure that bottom ceramic filter core inner shell goes out liquid gap department reduces suddenly, and such effect can drive the flow of fluid in interior cone cylinder ceramic filter core assembly, plays the effect of suction with higher speed and periodic impact, and then prevents that ceramic filter core from blockking up.

According to the invention, a multi-stage inner cone cylinder type ceramic filter element assembly is adopted, three-layer filtration of oil can be completed by each stage of inner cone cylinder type ceramic filter element assembly, the length of a fracturing sand filtration path is increased by the application of the ceramic filter element, and the sand prevention effect is good. The fracturing sand and silt component that can make fluid carry in with fluid are filtered completely before getting into the oil-well pump, guarantee that the oil-well pump is normal, steady production, the problem of sand card can not appear.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of an inner cone type ceramic filter element assembly.

In the figure, A-a screen pipe outer cylinder liquid inlet hole, B-a filter element outer shell liquid inlet gap, C-a filter element inner shell liquid outlet gap, D-an oil sleeve annular space, 1-a tubing coupling, 2-a screen pipe upper joint, 3-a screen pipe outer cylinder, 4-a ceramic filter element assembly, 5-a screen pipe lower joint, 6-a sleeve, 401-a shell upper cover, 402-a filter element outer shell, 403-a ceramic filter element, 404-a filter element inner shell and 405-a shell lower cover.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

as shown in figures 1 and 2, the inner cone type sand control screen pipe comprises a screen pipe upper joint 2 and a screen pipe lower joint 5, wherein the upper end of the screen pipe upper joint 2 is connected with an oil pipe through an oil pipe coupling 1, a screen pipe outer cylinder 3 is connected between the screen pipe upper joint 2 and the screen pipe lower joint 5 through threads, and a plurality of screen pipe outer cylinder liquid inlet holes A are formed in the screen pipe outer cylinder 3. The sieve tube outer barrel 3 is internally provided with a plurality of ceramic filter element assemblies 4, the sieve tube upper joint 2 and the sieve tube lower joint 5 limit the ceramic filter element assemblies 4 inside, and the two adjacent ceramic filter element assemblies 4 are in compression joint.

The ceramic filter element assembly 4 comprises a filter element outer shell 402 and a filter element inner shell 404, a ceramic filter element 403 is arranged between the outer shell and the inner shell, and the two ends of the filter element outer shell 402 and the two ends of the filter element inner shell 404 are respectively connected with a shell upper cover 401 and a shell lower cover 405, so that the ceramic filter element 403 is sealed between the outer shell and the inner shell. The inner housing 404 is conical, with a small inner diameter at the upper end and a large inner diameter at the lower end. It has filter core outer shell feed liquor gap B to open on filter core outer shell 402, and it has filter core inner shell to go out liquid gap C to open on filter core inner shell 404, and filter core outer shell feed liquor gap B is located filter core inner shell and goes out liquid gap C's top, and filter core inner shell goes out liquid gap C and is located filter core inner shell 404 major diameter one end promptly, and filter core outer shell feed liquor gap B corresponds with filter core inner shell 404 minor diameter one end, and the liquid gap department can form the negative pressure at crude oil lift in-process filter core inner shell department, helps crude oil to get into in the screen pipe.

When the inner cone type sand control pipe works, an oil sleeve annular space D is formed between the screen pipe outer cylinder 3 and the sleeve 6, oil enters the ceramic filter element assembly 4 from a screen pipe outer cylinder liquid inlet hole A on the screen pipe outer cylinder 3, a filter element shell liquid inlet gap B is formed between the screen pipe outer cylinder and the sleeve, primary filtration is completed, and a very small amount of fracturing sand silt carried in the oil is blocked outside the filter element shell liquid inlet gap B; then, the oil liquid enters the ceramic filter element 403 to continuously move downwards, the ceramic filter element 403 finishes the second filtration, and only the more tiny fracturing sand silt carried in the oil liquid is completely filtered; and finally, oil enters a conical channel in the ceramic filter element assembly through a liquid outlet gap C of the inner shell of the ceramic filter element, and the oil at the moment no longer contains fracturing sand containing silt components, so that the effect of preventing the sand jamming phenomenon of the oil well pump is achieved. The inner filter element shell 404 of the ceramic filter element assembly 4 is conical, and the inner filter element shell liquid outlet gap C on the inner filter element shell 404 is positioned below the outer filter element shell liquid inlet gap B on the outer filter element shell 402. After entering the ceramic filter element assembly 4 from the filter element outer shell liquid inlet gap B, the oil liquid passes through the ceramic filter element 403 and then enters the conical channel in the ceramic filter element assembly from the filter element inner shell liquid outlet gap C, so that the length of a filtering path is increased by fully utilizing the height of the ceramic filter element 403, and the filtering effect on silt components is enhanced; meanwhile, as the filter element inner shell 404 is conical, the flow velocity of oil is suddenly increased when the oil flows through the top end of the filter element inner shell 404, and the pressure at the liquid outlet gap C of the filter element inner shell at the bottom end is suddenly reduced, the oil is driven to flow in the ceramic filter element assembly 4 by the effect, the effects of accelerating suction and periodic impact are achieved, and the ceramic filter element 403 is prevented from being blocked.

Claims (5)

1. The utility model provides an interior cone drum sand control screen pipe, includes screen pipe top connection (2), screen pipe lower clutch (5), be connected with screen pipe urceolus (3) its characterized in that between screen pipe top connection (2), screen pipe lower clutch (5): and a plurality of ceramic filter element assemblies (4) are arranged inside the sieve tube outer cylinder (3).

2. The inner cone sand screen of claim 1, wherein: the ceramic filter element assembly (4) comprises a filter element outer shell (402) and a filter element inner shell (404), and a ceramic filter element (403) is arranged between the filter element outer shell and the filter element inner shell; the filter element outer shell (402) is provided with a filter element outer shell liquid inlet gap (B), and the filter element inner shell (404) is provided with a filter element inner shell liquid outlet gap (C).

3. The inner cone type sand screen as claimed in claim 2, wherein: the filter element outer shell liquid inlet gap (B) is positioned above the filter element inner shell liquid outlet gap (C).

4. The inner cone type sand screen as claimed in claim 3, wherein: the filter element inner shell (404) is conical, the liquid outlet gap (C) of the filter element inner shell is positioned at one end with the large diameter of the filter element inner shell (404), and the liquid inlet gap (B) of the filter element outer shell corresponds to one end with the small diameter of the filter element inner shell (404).

5. The inner cone sand screen of claim 4, wherein: and the two ends of the filter element outer shell (402) and the two ends of the filter element inner shell (404) are respectively connected with the shell upper cover (401) and the shell lower cover (405).

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