CN111502609A - Water injection sand prevention pipe column capable of cleaning annular space of screen sleeve and well cleaning method - Google Patents

Abstract

The invention discloses a water injection sand control pipe column capable of cleaning a screen sleeve annulus and a well cleaning method, the water injection sand control pipe column comprises a water injection pipe column and a sand control pipe column, the water injection pipe column moves upwards through a lifting device, meanwhile, a well cleaning valve is opened by a switching tool in the water injection pipe column, the water injection pipe column is inserted into a seal and seals with a sealing barrel of the sand control pipe column to establish a circulation channel, water injection cleaning is carried out through the annulus between a sleeve and the water injection pipe column, cleaning liquid enters the screen sleeve annulus through the well cleaning valve to be cleaned, impurities and scale in the screen sleeve annulus flow out through the well cleaning valve at the lower part of a screen pipe, the process is circulated layer by layer and finally enters the bottom, cleaning single-flow impurities and liquid enter the pipe column through the bottom valve of the. The invention realizes the function of cleaning the whole well bore of the water injection well by adding the structural combination of the well washing valve, the inserting seal and the like.

Description

Water injection sand prevention pipe column capable of cleaning annular space of screen sleeve and well cleaning method

Technical Field

The invention belongs to the field of production of water injection wells in oil fields, and particularly relates to a water injection sand prevention pipe column capable of cleaning the annular space of a screen sleeve and a well cleaning method.

Background

In the operation of a water injection well of an oil well, the yield of a peripheral oil well is increased by using clear water to inject a stratum into the water injection well, the clear water can generate impurities and water scales in the long-time injection process, the impurities and the water scales generated by the annular space of a screen sleeve between a sand control pipe column and a sleeve can not be removed, the annular space of the screen sleeve can be cleaned through later measures, the annular space of the screen sleeve can be cleaned by no process at present, the service life of the water injection pipe column of the water injection well is shortened, and once the water injection screen pipe is blocked in the later stage, the water injection pressure is increased.

Disclosure of Invention

The invention provides a water injection sand control pipe column capable of cleaning the annular space of a screen sleeve and a well cleaning method for solving the technical problems in the prior art. When the water injection pressure of the water injection pipe column rises and the pipe column stops injecting water, the water distributor is closed; through well head hydraulic control hoisting device, promote the water injection tubular column to appointed height, make the sealed section of thick bamboo cooperation in inserting sealed and the sand control tubular column in the water injection tubular column, the well-flushing valve switching tool among the water injection tubular column shifts up thereupon and opens the well-flushing valve, establish screen sleeve annular space well-flushing passageway, allow impurity and incrustation scale circulation to pass through, realize the washing of full pit shaft screen sleeve annular space, reset the tubular column through hoisting device pressure control after the washing is accomplished, can carry out the water injection operation again.

The invention is realized by the following technical scheme:

a water injection sand control pipe column capable of cleaning the annular space of a screen sleeve comprises a sand control pipe column and a water injection pipe column;

the sand control pipe column comprises a top packer, an isolation packer, a sand setting packer, a first sieve pipe, a second sieve pipe, a first sealing cylinder, a second sealing cylinder, a third sealing cylinder, a fourth sealing cylinder, a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve;

the water injection pipe column comprises an oil pipe, a lifting device, an anchoring seal, a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool, a fourth well flushing valve switching tool, a first inserting seal, a second inserting seal, a third inserting seal and a fourth inserting seal;

a top packer, an isolation packer and a sand setting packer are arranged in the sleeve, a first sealing barrel, a first sieve tube and a second sealing barrel are sequentially arranged between the top packer and the isolation packer from top to bottom, a third sealing barrel, a second sieve tube and a fourth sealing barrel are sequentially arranged between the isolation packer and the sand setting packer from top to bottom, a first well washing valve is arranged on the first sealing barrel, a second well washing valve is arranged below the second sealing barrel, a third well washing valve is arranged on the third sealing barrel, and a fourth well washing valve is arranged below the fourth sealing barrel;

the water injection pipe column is arranged inside the sand control pipe column, a lifting device is arranged at the upper end of the water injection pipe column, a check valve is arranged at the bottom of the water injection pipe column, an anchoring seal, a first inserting seal, a second inserting seal, a third inserting seal and a fourth inserting seal are arranged on the water injection pipe column, a first water distributor and a second water distributor are further arranged on the water injection pipe column, the first water distributor is located between the first inserting seal and the second inserting seal, and the second water distributor is located between the third inserting seal and the fourth inserting seal; in an initial state, the anchoring seal is matched with the top packer to form an anchoring seal, the second inserting seal is matched with a sealing cylinder of the isolation packer to form a seal, and the fourth inserting seal is matched with a sealing cylinder of the sand setting packer to form a seal; and a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool and a fourth well flushing valve switching tool which correspond to the first well flushing valve, the second well flushing valve, the third well flushing valve and the fourth well flushing valve respectively are arranged on the water injection pipe column.

In the technical scheme, the lifting device is driven by hydraulic pressure, and the water injection pipe column is driven to lift and sink by injecting pressure into the piston cavity through the hydraulic control pipeline.

In the technical scheme, the first well flushing valve switching tool, the second well flushing valve switching tool, the third well flushing valve switching tool and the fourth well flushing valve switching tool which are arranged in the water injection pipe column can be used for switching on and off the first well flushing valve, the second well flushing valve, the third well flushing valve and the fourth well flushing valve.

A method for cleaning the annulus of a screen sleeve comprises the following steps:

step one, when stopping injection, closing a first water distributor and a second water distributor, lifting a water injection pipe column through a lifting device, and respectively opening a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve through a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool and a fourth well flushing valve switching tool which are arranged in the water injection pipe column; the insertion seal arranged in the water injection pipe column is matched with the corresponding sealing barrel to realize sealing.

Injecting a flushing fluid into an annulus between the water injection pipe column and the sleeve from a wellhead, wherein the flushing fluid firstly enters the annulus above the first insert seal (between the water injection pipe column and the sand control pipe column), then enters a screen sleeve annulus between the top packer and the isolation packer through a first flushing valve, flows into the annulus between the second insert seal and the third insert seal (between the water injection pipe column and the sand control pipe column) through a second flushing valve, then enters the screen sleeve annulus between the isolation packer and the sand setting packer through a third flushing valve, flows into the annulus between the bottom water injection pipe column and the sleeve through a fourth flushing valve, and finally returns to the ground from the inside of the water injection pipe column through a check valve to complete the operation of cleaning the screen sleeve annulus through water injection.

And step three, after water injection cleaning is completed, sinking the water injection pipe column through a lifting device, respectively closing a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve by a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool and a fourth well flushing valve switching tool which are arranged in the water injection pipe column, and restoring the integral pipe column to the initial position. The water injection operation can be performed again.

The invention has the advantages and beneficial effects that:

the invention relates to a water injection sand control pipe column capable of cleaning the annulus of a screen sleeve and a well washing method, wherein the water injection sand control pipe column comprises a water injection pipe column and a sand control pipe column, the water injection pipe column moves upwards through a lifting device, a well washing valve switching tool arranged on the water injection pipe column moves upwards along with the pipe column to open a corresponding well washing valve, the water injection pipe column is inserted into a sealing barrel of the sand control pipe column in a sealing and matching mode, water injection cleaning is carried out through the annulus between a sleeve and the water injection pipe column, cleaning liquid enters the annulus of the screen sleeve after passing through the well washing valve and then flows out through the well washing valve at the lower part of the screen pipe, the process is circulated layer by layer and finally enters the bottom, cleaning impurities and liquid enter the interior of the pipe column through a check valve. The washing of screen sleeve annular space can't be realized to traditional technology, can only realize the washing of water injection tubular column and sand control tubular column intermediate layer, leads to the water injection well life-span to reduce by a wide margin, often meets the water injection tubular column stifled die, and water injection pressure increases the scheduling problem. The invention realizes the function of cleaning the whole well bore of the water injection well by adding the structural combination of the well washing valve, the inserting seal and the like.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a water injection sand control tubular column capable of cleaning the annular space of a screen casing.

FIG. 2 is a schematic view of the water injection flow direction in a method of cleaning the annulus of a screen casing according to the present invention.

Wherein: the device comprises a casing 1, an oil pipe 2, a lifting device 3, a hydraulic control pipeline 4, an anchoring seal 5, a first inserting seal 6, a second inserting seal 7, a third inserting seal 8, a fourth inserting seal 9, a check valve 10, a first water distributor 11, a second water distributor 12, a top packer 13, an isolation packer 14, a sand setting packer 15, a first sieve pipe 16, a second sieve pipe 17, a first sealing cylinder 18, a second sealing cylinder 19, a third sealing cylinder 20, a fourth sealing cylinder 21, a first flushing valve 22, a second flushing valve 23, a third flushing valve 24, a fourth flushing valve 25, a first flushing valve switching tool 26, a second flushing valve switching tool 27, a third flushing valve switching tool 28 and a fourth flushing valve switching tool 29.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the present invention is further described below with reference to specific examples.

Examples

A water injection sand control pipe column capable of cleaning the annular space of a screen sleeve comprises a sand control pipe column and a water injection pipe column;

the sand control pipe column comprises a top packer 13, an isolation packer 14, a sand setting packer 15, a first sieve pipe 16, a second sieve pipe 17, a first sealing barrel 18, a second sealing barrel 19, a third sealing barrel 20, a fourth sealing barrel 21, a first well flushing valve 22, a second well flushing valve 23, a third well flushing valve 24 and a fourth well flushing valve 25;

the water injection string comprises an oil pipe 2, a lifting device 3, a first well flushing valve opening and closing tool 26, a second well flushing valve opening and closing tool 27, a third well flushing valve opening and closing tool 28, a fourth well flushing valve opening and closing tool 29, an anchoring seal 5, a first inserting seal 6, a second inserting seal 7, a third inserting seal 8 and a fourth inserting seal 9;

a top packer 13, an isolation packer 14 and a sand setting packer 15 are arranged in the casing 1, a first sealing barrel 18, a first sand control pipe column 16 and a second sealing barrel 19 are sequentially arranged between the top packer and the isolation packer from top to bottom, a third sealing barrel 20, a second sand control pipe column 17 and a fourth sealing barrel 21 are sequentially arranged between the isolation packer and the sand setting packer from top to bottom, a first well washing valve 22 is arranged on the first sealing barrel, a second well washing valve 23 is arranged below the second sealing barrel, a third well washing valve 24 is arranged on the third sealing barrel, and a fourth well washing valve 25 is arranged below the fourth sealing barrel;

the water injection pipe column is arranged inside the sand prevention pipe column, a lifting device is arranged at the upper end of the water injection pipe column, the lifting device is driven by hydraulic pressure, pressure is injected into a piston cavity through a hydraulic control pipeline 4 to drive the water injection pipe column to lift and sink, a check valve 10 is arranged at the bottom of the water injection pipe column, and an anchoring seal 5, a first inserting seal 6, a second inserting seal 7, a third inserting seal 8 and a fourth inserting seal 9 are fixedly arranged on the water injection pipe column;

the water injection pipe column is also provided with a first water distributor 11 and a second water distributor 12, the first water distributor is positioned between a first inserting seal and a second inserting seal, and the second water distributor is positioned between a third inserting seal and a fourth inserting seal;

the first well flushing valve is an inside-out one-way valve, the second well flushing valve is an outside-in one-way valve, the third well flushing valve is an inside-out one-way valve, and the fourth well flushing valve is an outside-in one-way valve.

In an initial state, the anchoring seal is matched and sealed with the top packer, the second inserting seal is matched and sealed with the isolation packer, and the fourth inserting seal is matched and sealed with the sand setting packer; under the operation condition of cleaning the annular space of the screen sleeve, the first inserting seal moves upwards to the first sealing barrel, the second inserting seal moves upwards to the second sealing barrel, the third inserting seal moves upwards to the third sealing barrel, the fourth inserting seal moves upwards to the fourth sealing barrel, the four sealing barrels are respectively matched and sealed, and meanwhile, a well washing valve switching tool arranged in a water injection pipe column moves upwards to separately open four well washing valves.

When the water injection sand control tubular column capable of cleaning the annular space of the screen sleeve is used for cleaning the annular space of the screen sleeve, the method comprises the following steps:

taking the pipe column shown in fig. 2 as an example, flushing fluid enters a shaft through a sleeve and a water injection pipe column annular space, the flushing fluid enters the inner side of a sand control pipe when passing through a top packer, the flushing fluid enters a first layer of screen sleeve annular space through a first flushing valve due to the fact that a first insert seal is sealed with a first sealing barrel, the flushing fluid continues to enter a second flushing valve downwards and flows through the inner side of an isolation packer due to the fact that a first water distributor is in a closed state, the flushing fluid enters a second layer of screen sleeve annular space through a third flushing valve due to the fact that a third insert seal is sealed with a third sealing barrel, the flushing fluid continues to enter a fourth flushing valve downwards and flows through the inner side of a sand setting packer, the flushing fluid enters the inner side of the pipe column through a check valve of the water injection pipe column and returns to the ground all the time, and the whole flushing process flow is completed.

In addition to the cleaning of the annular space between the sieve tube and the sleeve, the water injection sand control pipe column capable of cleaning the annular space of the sieve tube can also complete the cleaning of the annular space between a conventional oil pipe and the sieve tube, and the cleaning process comprises the following steps: and similarly, the water injection pipe column is lifted to another position through the lifting device, so that the flushing fluid enters the inner side of the sand control pipe when passing through the top packer under the condition that the insertion seal is not matched with the sealing barrel, the flushing fluid falls from the annular space between the oil pipe and the sieve pipe due to the fact that the insertion seal does not perform a sealing effect, and the flushing operation of the annular space of the oil sieve is realized through reverse circulation cleaning.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.

Claims (4)

1. The utility model provides a can wash water injection sand control tubular column of screen jacket annular space which characterized in that: comprises a sand control pipe column and a water injection pipe column;

the sand control pipe column comprises a top packer, an isolation packer, a sand setting packer, a first sieve pipe, a second sieve pipe, a first sealing cylinder, a second sealing cylinder, a third sealing cylinder, a fourth sealing cylinder, a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve;

the water injection pipe column comprises an oil pipe, a lifting device, an anchoring seal, a first well flushing valve opening and closing tool, a second well flushing valve opening and closing tool, a third well flushing valve opening and closing tool, a fourth well flushing valve opening and closing tool, a first inserting seal, a second inserting seal, a third inserting seal and a fourth inserting seal;

a top packer, an isolation packer and a sand setting packer are arranged in the sleeve, a first sealing barrel, a first sieve tube and a second sealing barrel are sequentially arranged between the top packer and the isolation packer from top to bottom, a third sealing barrel, a second sieve tube and a fourth sealing barrel are sequentially arranged between the isolation packer and the sand setting packer from top to bottom, a first well washing valve is arranged on the first sealing barrel, a second well washing valve is arranged below the second sealing barrel, a third well washing valve is arranged on the third sealing barrel, and a fourth well washing valve is arranged below the fourth sealing barrel;

the water injection pipe column is arranged inside the sand control pipe column, a lifting device is arranged at the upper end of the water injection pipe column, a check valve is arranged at the bottom of the water injection pipe column, an anchoring seal, a first inserting seal, a second inserting seal, a third inserting seal and a fourth inserting seal are arranged on the water injection pipe column, a first water distributor and a second water distributor are further arranged on the water injection pipe column, the first water distributor is located between the first inserting seal and the second inserting seal, and the second water distributor is located between the third inserting seal and the fourth inserting seal; in an initial state, the anchoring seal is matched and anchored with the top packer, the second inserting seal is matched and sealed with the isolation packer, and the fourth inserting seal is matched and sealed with the sand setting packer; and a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool and a fourth well flushing valve switching tool which correspond to the first well flushing valve, the second well flushing valve, the third well flushing valve and the fourth well flushing valve respectively are arranged on the water injection pipe column.

2. The water injection sand control pipe string capable of cleaning the annulus of the screen casing according to the claim 1, characterized in that: the lifting device is driven by hydraulic pressure, and pressure is injected into the piston cavity through a hydraulic control pipeline to drive the water injection pipe column to lift and sink.

3. The water injection sand control pipe string capable of cleaning the annulus of the screen casing according to the claim 1, characterized in that: through arranging in the water injection tubular column first well-flushing valve switching tool, second well-flushing valve switching tool, third well-flushing valve switching tool, the fourth well-flushing valve switching tool of arranging in the water injection tubular column, can realize the switch to first well-flushing valve, second well-flushing valve, third well-flushing valve and fourth well-flushing valve.

4. A method for cleaning a screen sleeve annulus is characterized by comprising the following steps:

step one, when stopping injection, closing the first water distributor and the second water distributor, lifting the water injection pipe column through a lifting device, closing the first water distributor and the second water distributor, and opening a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve through a well flushing valve switching tool arranged in the water injection pipe column;

injecting a flushing fluid into an annulus between the water injection pipe column and the sleeve from a wellhead, wherein the flushing fluid firstly enters the annulus between the water injection pipe column and the sand control pipe column above the first insert seal, then enters a screen sleeve annulus between the top packer and the isolation packer through a first flushing valve, flows into the annulus between the water injection pipe column and the sand control pipe column between the second insert seal and the third insert seal through a second flushing valve, then enters the screen sleeve annulus between the isolation packer and the sand setting packer through a third flushing valve, and then flows into the annulus between the water injection pipe column at the bottom and the sleeve through a fourth flushing valve, and finally the flushing fluid returns to the ground from the interior of the water injection pipe column through a check valve to complete the operation of water injection and screen sleeve annulus cleaning;

and step three, after water injection cleaning is completed, sinking the water injection pipe column through a lifting device, respectively closing a first well flushing valve, a second well flushing valve, a third well flushing valve and a fourth well flushing valve by a first well flushing valve switching tool, a second well flushing valve switching tool, a third well flushing valve switching tool and a fourth well flushing valve switching tool which are arranged in the water injection pipe column, and restoring the integral pipe column to the initial position. The water injection operation can be performed again.

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