CN112324398B - Sand control tubular column and wash sand control integration tubular column - Google Patents
Sand control tubular column and wash sand control integration tubular column Download PDFInfo
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- CN112324398B CN112324398B CN202011280950.6A CN202011280950A CN112324398B CN 112324398 B CN112324398 B CN 112324398B CN 202011280950 A CN202011280950 A CN 202011280950A CN 112324398 B CN112324398 B CN 112324398B
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- pipe
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- sand
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
Abstract
The invention provides a sand prevention pipe column, which comprises a pipe body and a central pipe arranged in the pipe body, wherein the upper end of the pipe body is a shunting structure for butting an oil pipe, the lower end of the pipe body is provided with a new sieve pipe, the lower end of the new sieve pipe is connected with a pipe head with a narrowed pipe diameter through a conical pipe, the lower end of the pipe head is provided with a circulating valve, the lower end of the central pipe is hermetically penetrated in the pipe head and is connected with the circulating valve, and a backwashing valve is also arranged at the position, close to the pipe head, of the central pipe; still provide a towards sand control integration tubular column, including first sleeve pipe, second sleeve pipe and foretell sand control tubular column, the intraductal of second sleeve pipe is inserted to the lower extreme of sand control tubular column. The sand washing and preventing integrated pipe column is specially used for sand washing and preventing integrated pipe columns needing secondary sand preventing operation, the pipe column can simultaneously realize sand washing operation and secondary sand preventing operation, only a primary pipe column needs to be put in, and the operation time is saved; the sand washing device is commonly used for sand control failure wells, and solves the technical problem that the sand washing operation and the sand control operation are respectively carried out for a long time.
Description
Technical Field
The invention relates to the field of oil well sand control devices, in particular to a sand control tubular column and a sand flushing and preventing integrated tubular column.
Background
In the low-yield and low-efficiency wells of offshore oil fields, the oil wells with greatly reduced yield caused by sand control failure account for a certain proportion, and the yield of the oil fields is seriously influenced. The currently adopted secondary sand control modes mainly comprise three modes, namely, the sand control pipe column is directly fished out through overhaul fishing, and a new screen pipe is put in again for sand control; secondly, cutting the original screen pipe, fishing out the upper pipe string, drilling a side well, and then putting a new screen pipe for sand prevention; and thirdly, putting the sand washing pipe column to wash and return out the deposited sand at the bottom of the well, and then putting a new screen pipe to perform sand prevention. No matter which kind of mode is adopted, two tubular column operations of sand washing and sand control need all be carried out, there are the operation length consuming time, and the risk is high, problem such as with high costs.
Chinese patent CN201510134953.1 discloses a thermal production well separate-layer fracturing sand control pipe column and a sand control method thereof, which uses tools such as a backwashing device and a fracturing and filling conversion device, and has the advantages of no-moving pipe column backwashing, casing-pressure-free fracturing, backflow prevention and the like. However, chinese patent CN201510134953.1 does not disclose the secondary sand control technology.
Disclosure of Invention
The invention provides a sand control tubular column and a sand control integrated tubular column in order to solve the problems that the two times of tubular column operations of sand washing and sand control are needed, the operation time consumption is long, the risk is high and the cost is high in the prior art. The invention can realize sand washing operation and secondary sand prevention operation at the same time, only needs to put in the tubular column once, and saves the operation time.
In order to solve the technical problems, the invention adopts the technical scheme that: a sand control pipe column comprises a pipe body and a central pipe arranged in the pipe body, wherein a flow distribution structure used for being butted with an oil pipe is arranged in the upper end of the pipe body, a new screen pipe is arranged at the lower end of the pipe body, the lower end of the new screen pipe is connected with a pipe head with a narrowed pipe diameter through a conical pipe, a circulating valve is arranged at the lower end of the pipe head, the upper end of the central pipe is connected with the flow distribution structure, the lower end of the central pipe is arranged in the pipe head in a sealing penetrating mode and is connected with the circulating valve, a backwashing valve is further arranged at a position, close to the pipe head, of the central pipe, the upper half section of the central pipe is connected with the flow distribution structure, one end, connected with the central pipe, of the flow distribution structure is connected with the inner wall of the pipe body through a first sealing element, and a second sealing element and a sliding sleeve switching tool which are sequentially arranged on the outer wall of the middle part of the central pipe from top to bottom; still be equipped with on the body and release the instrument and with the sliding sleeve switching tool cooperation is used fills the sliding sleeve, release the instrument and be located the below of first sealing member and be close to first sealing member, it is located to fill the sliding sleeve the top of second sealing member and be close to the second sealing member.
Furthermore, the reposition of redundant personnel structure includes reducing reposition of redundant personnel festival and bridge type reposition of redundant personnel festival, the reducing reposition of redundant personnel festival include with the osculum end of bridge type reposition of redundant personnel festival one end butt joint and be used for the macrostoma end that docks oil pipe, the other end of bridge type reposition of redundant personnel festival is connected the center tube, first sealing member cover is located on the outer wall of bridge type reposition of redundant personnel festival, the opening has been seted up on the body outer wall with on the position outer wall that the reducing reposition of redundant personnel festival corresponds.
Furthermore, first sealing member is including fixing first sealing washer on the bridge type reposition of redundant personnel festival outer wall and fixing the body inner wall correspond the position and with the first sealed work section of thick bamboo that first sealing washer cooperation was used, the second sealing member is including fixing second sealing washer on the center tube outer wall and fixing correspond the position on the body inner wall and with the second sealed work section of thick bamboo that first sealing washer cooperation was used.
Furthermore, the sliding sleeve opening and closing tool comprises a fixing part fixed on the circumferential outer wall of the central pipe, an elastic strip is arranged on the circumferential outer wall of the fixing part, a liquid circulation gap is formed in the elastic strip, and a groove used for closing the filling sliding sleeve is formed in one end, close to the inner wall of the pipe body, of the elastic strip.
Further, the backwashing valve is a one-way conducting valve which enables fluid to flow from the outside to the inside of the central pipe only.
Still provide a towards sand control integration tubular column, including first sleeve pipe, second sleeve pipe and foretell sand control tubular column, sand control tubular column's lower extreme inserts the second sheathed tube is intraductal, new screen pipe with former screen pipe on the second sleeve pipe is located same height, first sleeve pipe is established sand control tubular column's upper end, first sheathed tube lower extreme with second sheathed tube upper end is connected, the outside cover of reposition of redundant personnel structure lower extreme be equipped with the sealed partition body of first sleeve pipe wall connection, the middle part position of body still the cover be equipped with second sleeve pipe wall connection third sealing member, the third sealing member be in fill the top of sliding sleeve and be close to fill the sliding sleeve.
Furthermore, the sealing and sealing part comprises two leather cup packers which are arranged in a back-to-back mode, small opening ends of the two leather cup packers are attached to each other, and large opening ends of the two leather cup packers are in interference fit with the inner wall of the first sleeve.
Furthermore, the inner wall of the lower end of the first sleeve is connected with the outer wall of the upper end of the second sleeve in a sealing mode through a packer.
Further, the third seal is an anchor seal tool.
Furthermore, an elastic slip capable of being inserted into the packer to realize axial anchoring of the pipe body is installed outside the anchoring sealing tool, and the anchoring force of the anchoring sealing tool is larger than the pulling force required by the releasing tool to be disengaged.
Compared with the prior art, the beneficial effects are:
1. the sand control pipe column can play a secondary sand control role and can also perform sand washing operation by matching with the original sand control well through the arrangement of the fluid channel; the sand control well is suitable for general sand control wells, compact and ingenious in structure and convenient to use.
2. The sand washing and preventing integrated pipe column is specially used for sand washing and preventing integrated pipe columns needing secondary sand preventing operation, the pipe column can simultaneously realize sand washing operation and secondary sand preventing operation, only a primary pipe column needs to be put in, and the operation time is saved; the sand washing device is commonly used for sand control failure wells, and solves the technical problem that the sand washing operation and the sand control operation are respectively carried out for a long time.
Drawings
FIG. 1 is a schematic structural view of example 1.
FIG. 2 is a schematic structural view of example 2.
FIG. 3 is a schematic view showing the structure of the sand washing process carried out in example 2.
Fig. 4 is a schematic structural view of a secondary sand control process performed in example 2.
FIG. 5 is a schematic diagram of the well-flushing process carried out in example 2.
Figure 6 is a schematic diagram of the structure of the wellstring after the operation of example 2.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1
As shown in fig. 1, the sand control pipe column comprises a pipe body 6 and a central pipe 11 arranged inside the pipe body 6, wherein the upper end of the pipe body 6 is a flow distribution structure for butting against an oil pipe 1, the lower end of the pipe body is provided with a new sieve pipe 12, the lower end of the new sieve pipe 12 is connected with a pipe head 14 with a narrowed pipe diameter through a tapered pipe, the lower end of the pipe head 14 is provided with a circulating valve 15, the lower end of the central pipe 11 is hermetically penetrated in the pipe head 14 and connected with the circulating valve 15, the central pipe 11 is also provided with a backwashing valve 13 at a position close to the pipe head 14, the upper half section of the central pipe 11 is connected with the flow distribution structure, one end of the flow distribution structure, which is connected with the central pipe 11, is connected with the inner wall of the pipe body 6 through a first sealing element 4, and the middle outer wall of the central pipe 11 is sequentially provided with a second sealing element 8 and a sliding sleeve opening and closing tool 9 from top to bottom, which are connected with the inner wall of the pipe body 6; a releasing tool 5 and a filling sliding sleeve 7 matched with a sliding sleeve opening and closing tool 9 are further arranged on the pipe body 6, the releasing tool 5 is located below the first sealing element 4 and close to the first sealing element 4, and the filling sliding sleeve 7 is located above the second sealing element 8 and close to the second sealing element 8; the reposition of redundant personnel structure includes reducing reposition of redundant personnel festival 2 and bridge type reposition of redundant personnel festival 3, reducing reposition of redundant personnel festival 2 includes the osculum end that docks with 3 one ends of bridge type reposition of redundant personnel festival and is used for docking oil pipe 1's macrostoma end, the center tube 11 is connected to the other end of bridge type reposition of redundant personnel festival 3, 4 covers of first sealing member are located on the outer wall of bridge type reposition of redundant personnel festival 3, opening 201 has been seted up with the position that reducing reposition of redundant personnel festival 2 corresponds on the outer wall of body 6, reducing reposition of redundant personnel festival 2 can be the assembly including a conical tube and a straight shape pipe butt joint, straight shape pipe butt joint is at the osculum end of conical tube, there is the circulation passageway between the inner wall of reducing reposition of redundant personnel festival 2 and body 6, the circulation passageway is put through in the both ends of bridge type reposition of redundant personnel festival 3 top, fluid can get into this circulation passageway through opening 201 on the outer wall of body 6, later get into bridge type reposition of redundant personnel festival 3, inside getting into center tube 11.
The first sealing element 4 comprises a first sealing ring 401 fixed on the outer wall of the bridge-type flow-dividing joint 3 and a first sealing working barrel 402 which is fixed at a corresponding position on the inner wall of the pipe body 6 and is matched with the first sealing ring 401 for use, and the second sealing element 8 comprises a second sealing ring 801 fixed on the outer wall of the central pipe 11 and a second sealing working barrel 802 which is fixed at a corresponding position on the inner wall of the pipe body 6 and is matched with the first sealing ring 401 for use; the sliding sleeve opening and closing tool 9 comprises a fixing part fixed on the circumferential outer wall of the central tube 11, an elastic strip is arranged on the circumferential outer wall of the fixing part, a liquid circulation gap is formed in the elastic strip, and a groove used for closing the filling sliding sleeve 7 is formed in one end, close to the inner wall of the tube body 6, of the elastic strip; the backwash valve 13 is a one-way valve that allows fluid to flow only from the outside to the inside of the center pipe 11, and the backwash valve 13 has a one-way function that prevents fluid from flowing from the inside to the outside, and allows fluid to flow from the outside to the inside of the backwash valve 13 and enter the center pipe 11 at a constant pressure difference.
In practice, tubular body 6 is placed in the well below, and is very long (not shown), typically up to one or two hundred meters, so that it is quickly connected by means of quick coupling 1010. The pipe diameter of the central pipe 11 is smaller than that of the outer pipe body 6, so that an annular space exists between the central pipe 11 and the pipe body 6, the central pipe and the pipe body are separated by the first sealing element 4 at the uppermost part, and the first sealing ring 401 in the first sealing element 4 is in interference fit with the first sealing working barrel 402; the upper and lower annular spaces are separated by a second sealing element 8 at the middle position, a second sealing ring 801 is in interference fit with a second sealing working cylinder 802, when the central pipe 11 is lifted, the second sealing ring 801 is relatively displaced with respect to the second sealing working cylinder 802, the sealing separation effect is lost, and the lower part of the central pipe 11 is in sealing butt joint with a small pipe head 14 of the pipe body 6 and is connected with the circulating valve 15. The sliding sleeve opening and closing tool 9 opens or closes the filling sliding sleeve 7 as the prior art, and the general principle is as follows: the filling sliding sleeve 7 is provided with a closing sleeve 701, bosses are arranged at two ends of the closing sleeve 701, an elastic strip on the sliding sleeve switch tool 9 can deform, when the sliding sleeve switch tool 9 moves upwards along with the central pipe 11, the sliding sleeve switch tool touches the closing sleeve 701, but due to the arrangement of the internal structure of the filling sliding sleeve 7, the closing sleeve 701 cannot move when the sliding sleeve switch tool touches the central pipe; after the sliding sleeve moves upwards, the elastic strip is compressed, and when the groove in the elastic strip hooks the boss at the upper end of the closing sleeve 701, the closing sleeve 701 can be driven to move, so that the filling sliding sleeve 7 is closed; similarly, the sliding sleeve opening and closing tool 9 can hook the boss at the lower end of the closing sleeve 701 to open the filling sliding sleeve 7; when the filling sliding sleeve 7 is opened, fluid can pass through, namely the fluid can enter and exit the pipe body 6 at the position of the filling sliding sleeve 7; due to the liquid flow gap provided in the elastic strip, the fluid can also pass axially through the sliding sleeve switching tool 9. The sand control pipe column can play a secondary sand control role and can also carry out sand washing operation by the arrangement of the fluid channel and the matching with an original sand control well; the sand control well is suitable for general sand control wells, compact and ingenious in structure and convenient to use.
Example 2
The embodiment provides a washing and sand control integrated pipe column, as shown in fig. 2, which includes a first casing 16, a second casing 17 and the sand control pipe column in embodiment 1, wherein the lower end of the sand control pipe column is inserted into the second casing 17, a new screen 12 and an original screen 18 on the second casing 17 are located at the same height, the first casing 16 is sleeved at the upper end of the sand control pipe column, the lower end of the first casing 16 is connected with the upper end of the second casing 17, a sealing and sealing member 22 connected with the inner wall of the first casing 16 is sleeved outside the lower end of the flow dividing structure, a third sealing member 20 connected with the inner wall of the second casing 17 is further sleeved at the middle position of the pipe body 6, and the third sealing member 20 is located above and close to the filling sliding sleeve 7; the sealing and sealing part 22 comprises two leather cup packers which are arranged in a reverse manner, small opening ends of the two leather cup packers are mutually attached, and large opening ends of the two leather cup packers are in interference fit with the inner wall of the first sleeve 16; the inner wall of the lower end of the first casing 16 is hermetically connected with the outer wall of the upper end of the second casing 17 through a top packer 19; the third seal 20 is an anchor seal tool; the anchoring sealing tool is externally provided with an elastic slip 21 which can be inserted into the packer to realize the axial anchoring of the pipe body 6, and the anchoring force of the anchoring sealing tool is larger than the pulling force required by the releasing tool 5 to be disengaged.
The embodiment is an integral structure of the sand control pipe column in the embodiment 1 as a new pipe column which is put into an original sand control well; the two cup packers are opposite in direction and can bear axial pressure difference at the same time, and the cups of the cup packers are in interference fit with the first sleeve 16; the cup packer can also move downwards along with the pipe column in the sand washing process. The pipe body 6 at the upper end and the lower end of the releasing tool 5 are connected together, and the upper part and the lower part are separated through certain pulling force, which belongs to the common knowledge in the industry. When the releasing tool 5 is pulled off, the anchoring effect of the anchoring sealing tool cannot be influenced, the first sleeve 16 and the second sleeve 17 cannot be separated, and the lower end pipe column cannot sink.
In practical use, the present embodiment mainly has three working processes:
the sand washing process comprises the following steps:
pumping sand washing liquid through an annular space between the oil pipe 1 and the first sleeve 16, wherein a liquid flow channel of the sand washing liquid enters a wall clamping cavity between the reducing flow-dividing joint 2 of the flow-dividing structure and the pipe body 6 through an opening 201 as shown in figure 3, then enters an inner cavity of the upper part of the central pipe 11 through channels on two sides of the bridge flow-dividing joint 3, and then sequentially passes through the position of the second sealing element 8, the position of the sliding sleeve switch tool 9, the lower half section of the central pipe 11, the backwashing valve 13 and the inner cavity of the pipe head downwards along the inner cavity of the central pipe 11, and then under the action of pressure difference, the sand washing liquid pushes away the circulating valve 15 to wash away sediment sand at the bottom of the well; the sand washing liquid is mixed with the dispersed deposited sand and returns upwards, flows through the annular space between the new screen pipe 15 and the original screen pipe 18, upwards passes through the annular space between the second sleeve 17 and the quick connector 10 as well as the second sealing working barrel 802, enters the annular space between the filling sliding sleeve 7 and the upper half section of the central pipe 11 through the filling channel of the filling sliding sleeve 7, upwards passes through the annular space between the upper half section of the central pipe 11 and the anchoring sealing tool as well as the releasing tool 5, then enters the inner cavity of the reducing shunt joint 2 through the inner channel of the bridge type shunt joint 3, and upwards flows through the inner cavity of the oil pipe 1 until the sand is returned to the ground.
When the sediment sand at the bottom of the well is more, the pump is started to circulate while the sand washing and secondary sand prevention integrated process pipe column is put in, the pipe column is put down until the anchoring sealing tool is inserted into the top packer 19, the pipe column finishes positioning and sealing, sand washing is continued until the sand content of the return liquid at the well mouth reaches the related technical requirements, the pump is stopped, and the sand washing operation is finished.
And (II) a secondary sand control process (taking gravel pack sand control as an example for explanation):
after the sand washing operation is finished, sand control fluid is pumped from the oil pipe 1, a fluid flow channel of the sand control fluid passes through an inner cavity of the reducing flow-dividing joint 2 downwards, passes through an inner channel of the bridge flow-dividing joint 3, enters an annular space between the upper half section of the base pipe 11 and the bridge flow-dividing joint 3, flows through an annular space between the upper half section of the base pipe 11 and the releasing tool 5 and the anchoring sealing tool downwards, passes through a filling channel of the filling sliding sleeve 7, enters an annular space between the second sleeve 17 and the filling sliding sleeve 7, passes through an annular space between the second sleeve 17 and the second sealing working barrel 802 and the quick connector 10 downwards, enters an annular space between the new screen 15 and the original screen 18, due to the filtering effect of the new screen 15, gravel in the sand control fluid stays in the annular space between the new screen 15 and the original screen 18, enters the annular space between the new screen 15 and the backwash valve 13 after the filtering of the sand control fluid, and presses open the backwash valve 13 under the action of pressure difference, and (2) the sand-prevention filtrate enters an inner cavity of a backwashing valve 13, and the sand-prevention filtrate upwards passes through the lower half section of the central tube 11, the sliding sleeve switching tool 9, the second sealing element 8 and the upper half section of the inner cavity of the central tube 11 in sequence in the tube of the central tube 11, then enters an inner channel of the bridge-type flow-dividing joint 3, enters an annular space between the cup packer 22 and the bridge-type flow-dividing joint 3, upwards passes through a tube wall channel of the reducing flow-dividing joint 2, enters an annular space between the first sleeve 16 and the oil tube 1 and the reducing flow-dividing joint 2, and upwards returns out from a ground wellhead.
(III) a well washing process:
after the secondary sand control operation is completed, the pump is stopped, the pipe column is lifted, as shown in fig. 5, the shear pin arranged on the releasing tool 5 is sheared, and the upper part and the lower part of the releasing tool 5 are separated. After the central tube 11 is lifted a certain distance, the sliding sleeve opening and closing tool 9 moves upward until the filling sliding sleeve 7 is closed after passing through the second seal operating cylinder 802.
Pumping flushing fluid from the annular space of the first sleeve 16 and the oil pipe 1, wherein the fluid flow channels of the flushing fluid enter the inner cavity of the inner interlayer wall of the reducing flow-dividing joint 2 as shown in figure 5, then enter the inner cavity of the upper half section of the central pipe 11 through the channels at the two sides of the bridge flow-dividing joint 3, then downwards sequentially pass through the second sealing element 8, the sliding sleeve switch tool 9, the lower half section of the central pipe 11, the backwash valve 13 and the inner cavity of the guide sealing short section 17, then the flushing fluid turns to enter the annular space between the new screen pipe 15 and the guide sealing short section 17, upwards sequentially pass through the annular space between the quick joint 10 and the backwash valve 13, the annular space between the second sealing working barrel 802 and the lower half section of the central pipe 11, fill the annular space between the sliding sleeve 7 and the sliding sleeve switch tool 9, the annular space between the anchoring sealing tool and the second sealing element 8, the annular space between the anchoring sealing tool and the upper half section of the central pipe 11, and the annular space between the first sleeve 16 and the upper half section of the central pipe 11, upwards through the annular space between the upper half section of the central tube 11 and the releasing tool 5, then enters the inner cavity of the reducing flow-dividing joint 2 through the internal channel of the bridge type flow-dividing joint 3, upwards flows through the inner cavity of the oil tube 1 until returning to the ground. The sand control fluid which does not enter between the new screen pipe 15 and the original screen pipe 18 during the secondary sand control operation can be washed to the ground through the well washing operation.
And (3) pulling out the upper pipe column, leaving the well pipe column as shown in figure 6, connecting the lower part of the releasing tool 5 with an anchoring sealing tool, and sequentially connecting the lower end of the anchoring tool 8 with a filling sliding sleeve 7, a second sealing working barrel 802, a quick joint 10, a new screen pipe 15 and a backwashing valve 18.
The embodiment is a sand washing and preventing integrated pipe column which is specially used for secondary sand preventing operation, the pipe column can realize the sand washing operation and the secondary sand preventing operation at the same time, and only a primary pipe column is needed to be put in, so that the operation time is saved; the sand washing device is commonly used for sand control failure wells, and solves the technical problem that the sand washing operation and the sand control operation are respectively carried out for a long time.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A sand control pipe column is characterized by comprising a pipe body (6) and a central pipe (11) arranged inside the pipe body (6), wherein a shunting structure for butting against an oil pipe (1) is arranged inside the upper end of the pipe body (6), a new sieve pipe (12) is arranged at the lower end of the pipe body, the lower end of the new sieve pipe (12) is connected with a pipe head (14) with a narrowed pipe diameter through a conical pipe, a circulating valve (15) is arranged at the lower end of the pipe head (14), the upper end of the central pipe (11) is connected with the shunting structure, the lower end of the central pipe (11) is hermetically arranged in the pipe head (14) in a penetrating manner and is connected with the circulating valve (15), a backwashing valve (13) is further arranged at the position, close to the pipe head (14), of the central pipe (11) is connected with the shunting structure at the upper half section, one end of the shunting structure, which is connected with the central pipe (11), is connected with the inner wall of the pipe body (6) through a first sealing element (4), a second sealing element (8) and a sliding sleeve opening and closing tool (9) which are connected with the inner wall of the pipe body (6) are sequentially arranged on the outer wall of the middle part of the central pipe (11) from top to bottom; still be equipped with on body (6) and release the instrument (5) and with sliding sleeve switch tool (9) cooperation use fill sliding sleeve (7), release the instrument (5) and be located the below of first sealing member (4) and be close to first sealing member (4), fill sliding sleeve (7) and be located the top of second sealing member (8) and be close to second sealing member (8).
2. The sand control pipe string as claimed in claim 1, wherein the flow dividing structure comprises a reducing flow dividing joint (2) and a bridge type flow dividing joint (3), the reducing flow dividing joint (2) comprises a small-mouth end butted with one end of the bridge type flow dividing joint (3) and a large-mouth end butted with an oil pipe (1), the other end of the bridge type flow dividing joint (3) is connected with the central pipe (11), the first sealing element (4) is sleeved on the outer wall of the bridge type flow dividing joint (3), and an opening (201) is formed in the outer wall of the pipe body (6) at a position corresponding to the reducing flow dividing joint (2).
3. The sand control string as recited in claim 2, characterized in that the first sealing element (4) comprises a first sealing ring (401) fixed on the outer wall of the bridge type flow-dividing joint (3) and a first sealing cylinder (402) fixed on the corresponding position of the inner wall of the tubular body (6) and used together with the first sealing ring (401), and the second sealing element (8) comprises a second sealing ring (801) fixed on the outer wall of the central tube (11) and a second sealing cylinder (802) fixed on the corresponding position of the inner wall of the tubular body (6) and used together with the second sealing ring (801).
4. The sand control pipe string according to claim 1, wherein the sliding sleeve opening and closing tool (9) comprises a fixing part fixed on the circumferential outer wall of the central pipe (11), an elastic strip is arranged on the circumferential outer wall of the fixing part, a liquid circulation gap is formed in the elastic strip, and a groove for closing the filling sliding sleeve (7) is formed in one end, close to the inner wall of the pipe body (6), of the elastic strip.
5. The sand control string as recited in claim 1, characterized in that the backwash valve (13) is a one-way communication valve allowing fluid to flow only from the outside to the inside of the base pipe (11).
6. A sand control integrated pipe column, which is characterized by comprising a first casing pipe (16), a second casing pipe (17) and the sand control pipe column of any one of claims 1 to 5, the lower end of the sand control pipe string is inserted into the pipe of the second casing pipe (17), the new screen pipe (12) and the original screen pipe (18) on the second casing pipe (17) are positioned at the same height, the first sleeve (16) is sleeved at the upper end of the sand control pipe column, the lower end of the first sleeve (16) is connected with the upper end of the second sleeve (17), a sealing and sealing part (22) which is connected with the inner wall of the first sleeve (16) in a sliding and sealing way is sleeved outside the lower end of the flow dividing structure, a third sealing element (20) connected with the inner wall of the second sleeve (17) is sleeved at the middle position of the pipe body (6), the third sealing element (20) is located above the filling sliding sleeve (7) and close to the filling sliding sleeve (7).
7. The integrated pipe string for sand washing and prevention according to claim 6, wherein the sealing and sealing part (22) comprises two leather cup packers which are arranged oppositely, the small opening ends of the two leather cup packers are attached to each other, and the large opening ends of the two leather cup packers are in interference fit with the inner wall of the first casing pipe (16).
8. The integrated flushing and sand control pipe string as recited in claim 6, characterized in that the inner wall of the lower end of the first casing pipe (16) is connected with the outer wall of the upper end of the second casing pipe (17) in a sealing way through a packer (19).
9. The integrated flushing and sand control pipe string as recited in claim 8, wherein the third seal (20) is an anchor seal tool.
10. The integrated flushing and sand control pipe string as recited in claim 9, characterized in that an elastic slip (21) capable of being inserted into the packer (19) to realize the axial anchoring of the pipe body (6) is mounted outside the anchoring and sealing tool, and the anchoring force of the anchoring and sealing tool is larger than the pulling force required for the releasing tool (5) to be disengaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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