CN108397181B - Combined implementation pipe column and method for fracturing and water control production - Google Patents
Combined implementation pipe column and method for fracturing and water control production Download PDFInfo
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- CN108397181B CN108397181B CN201810305956.0A CN201810305956A CN108397181B CN 108397181 B CN108397181 B CN 108397181B CN 201810305956 A CN201810305956 A CN 201810305956A CN 108397181 B CN108397181 B CN 108397181B
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
Abstract
The invention provides a combined implementation pipe column and a method for fracturing and water control production, wherein the combined implementation pipe column comprises a pipe column body, a hanging packer arranged at one end of the pipe column body, a ball seat arranged at the other end of the pipe column body, a plurality of open hole packers, a plurality of self-closing fracturing sliding sleeves and a plurality of switchable inflow control devices, wherein the open hole packers, the self-closing fracturing sliding sleeves and the switchable inflow control devices are arranged on the pipe column body and are positioned between the hanging packer and the ball seat; wherein, all be equipped with self-closing fracturing sliding sleeve and switchable inflow control device between per two adjacent bore hole packers, also be equipped with self-closing fracturing sliding sleeve and switchable inflow control device between ball seat and the bore hole packer rather than the nearest. By using the combined implementation pipe column, water control production can be realized when the depth of the oil well is deep, so that the oil yield of the oil well with deep depth is improved.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas exploitation equipment, and particularly relates to a combined implementation tubular column and a method for fracturing and water control production.
Background
The staged fracturing well completion technology is a common oil field production increasing method, and can obviously improve the permeability of a reservoir so as to achieve the aim of improving the yield of an oil well. After the staged fracturing operation, in order to solve the difficult problem of later stage production accuse water among the prior art, mainly through set up the fracturing sliding sleeve of switch on the tubular column to insert the tubular column through the coiled tubing that will carry the switch instrument and come selectively to open or close the switching fracturing sliding sleeve, in order to realize the production of accuse water. However, when the depth of the oil well is deep, for example, the depth of the oil well exceeds 7500 meters, the above water control method is not applicable due to the limitation of the length and material strength of the coiled tubing, so that the oil well with the depth of more than 7500 meters cannot realize water control production, and the oil yield of the oil well is low.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a combined execution string and method for fracturing and water control production, which can realize water control production even when the depth of an oil well is deep, thereby increasing the oil yield of the oil well with a deep depth.
The invention provides a combined implementation tubular column for fracturing and water control production, which comprises a tubular column body, a hanging packer arranged at one end of the tubular column body, a ball seat arranged at the other end of the tubular column body, a plurality of open hole packers, a plurality of self-closing fracturing sliding sleeves and a plurality of switchable inflow control devices, wherein the open hole packers, the self-closing fracturing sliding sleeves and the switchable inflow control devices are arranged on the tubular column body and are positioned between the hanging packer and the ball seat; the self-closing type fracturing sliding sleeve and the switchable inflow control device are arranged between every two adjacent open hole packers, and the self-closing type fracturing sliding sleeve and the switchable inflow control device are also arranged between the ball seat and the open hole packer closest to the ball seat.
Preferably, the switchable inflow control device comprises: the water control assembly comprises a first central pipe communicated with the pipe column body, an outer pipe sleeved on the first central pipe and a first sliding pipe arranged in the first central pipe, one end of the outer pipe is connected with the first central pipe, a first annular flow passage is formed between the outer pipe and the first central pipe, the first sliding pipe is provided with a first position and a second position in the first central pipe, and the outer wall of the first central pipe corresponding to the second position is provided with a through hole; one end of the water inlet assembly is hermetically connected with the other end of the outer pipe and is used for guiding fluid from an oil layer into the first annular flow passage; wherein when the first sliding tube is in a first position, the first sliding tube opens the through hole and places the first annular flow passage in communication with the first center tube to allow fluid from the oil formation to enter the first center tube after passing through the water intake assembly, first annular flow passage, and through hole in sequence; when the first sliding pipe is in the second position, the first sliding pipe blocks the through hole, so that fluid from the oil layer cannot enter the first central pipe.
Preferably, the inner wall of the first central tube is provided with a first positioning groove, a second positioning groove and a limiting groove which are axially spaced and sequentially away from the water inlet assembly, and two ends of the first sliding tube are respectively provided with a first elastic clamping jaw and a second elastic clamping jaw, wherein when the first sliding tube is located at a first position, the first elastic clamping jaw is clamped in the first positioning groove, the second elastic clamping jaw is clamped in the second positioning groove, and when the first sliding tube is located at a second position, the first elastic clamping jaw is clamped in the second positioning groove, and the second elastic clamping jaw is clamped in the limiting groove.
Preferably, the water inlet assembly comprises a sieve pipe, a docking plug and a second central pipe communicated with the pipe column body, the sieve pipe and the docking plug are sequentially sleeved on and connected to the second central pipe along the axial direction of the second central pipe, the sieve pipe is connected with a first end of the docking plug, a second end of the docking plug is inserted into the outer pipe and is in sealing connection with the inner peripheral wall of the outer pipe, and the second central pipe is exposed out of the second end of the docking plug and is connected with the first central pipe; and a second annular flow passage is formed between the sieve tube and the butt joint plug and the second base pipe, the second annular flow passage is communicated with the first annular flow passage, and fluid in an oil layer can sequentially enter the second annular flow passage and the first annular flow passage after passing through the sieve tube.
Preferably, the self-closing fracturing sliding sleeve arranged between the ball seat and the open hole packer closest to the ball seat is a differential pressure type switch sliding sleeve, and the rest self-closing fracturing sliding sleeves are ball throwing type switch sliding sleeves.
Preferably, the self-closing fracturing sliding sleeve comprises a third central pipe connected with the pipe column body, a second sliding pipe arranged in the third central pipe and capable of reciprocating along the axial direction of the third central pipe, a driving assembly for driving the second sliding pipe and an elastic resetting member arranged in the third central pipe, and a fracturing hole capable of communicating an inner cavity of the third central pipe with a stratum is formed in the side wall of the third central pipe; when the pressure in the third central pipe is greater than a preset opening pressure, the driving assembly can drive the second sliding pipe to move from a position for closing the fracturing hole to a position for opening the fracturing hole; when the pressure in the third central tube is reduced to be less than the preset opening pressure, the second sliding tube can be pushed from the position of opening the fracturing hole to the position of closing the fracturing hole under the action of the elastic resetting component.
According to the combined implementation pipe column for fracturing and water control production, firstly, an oil well is divided into a plurality of oil outlet sections through a ball seat and an open hole packer according to the distribution rule of permeability along a horizontal well, and each oil outlet section forms a relatively independent flowing space. The self-closing fracturing sliding sleeves are respectively arranged in each oil outlet section to perform staged fracturing, and the staged fracturing can improve the permeability of a reservoir and achieve the effect of improving the yield of an oil well. In addition, switchable inflow control devices are arranged in the oil outlet sections to realize sectional water control of the horizontal well, so that the pressure profile of the horizontal well is balanced, the heterogeneous reservoir layer can uniformly produce oil, the bottom water coning is delayed, and the oil production and recovery ratio of the oil-gas well are improved. The combined implementation tubular column provided by the invention has the advantages that the switchable inflow control device is applied to each oil outlet section separated by staged fracturing, the continuous oil pipe is prevented from continuously opening or closing the fracturing sliding sleeve to realize water control production, the water control production is not limited by the depth of an oil well, the water control production can be realized even if the depth of the oil well is more than 7500m, and the oil yield of the oil well is greatly improved. Furthermore, through the setting of self-closing fracturing sliding sleeve and switch formula inflow control device, can enough effectively prevent inflow control device to the influence of fracturing operation, can effectively prevent the influence of fracturing sliding sleeve to accuse water production again. In addition, the combined implementation pipe column for fracturing and water control production has the advantages of simple structure, safe and reliable use and convenience for wide popularization and application.
The invention also provides a combined implementation method of fracturing and water control production, which comprises the following steps:
step 1, running the combined implementation pipe column connected with the drilling rod into an oil well through the drilling rod, setting the suspension packer and each open hole packer after slurry replacing operation is carried out, and replacing the drilling rod with a back-inserting pipe column;
step 2, injecting fracturing fluid into the back-plugging string and putting a pressure-building ball into the back-plugging string to perform staged fracturing operation, sequentially opening the self-closing fracturing sliding sleeves according to a sequence from the position close to the ball seat to the position far away from the ball seat, and ensuring that the latter self-closing fracturing sliding sleeve is opened again after the former self-closing fracturing sliding sleeve is closed;
and 3, forcing the pressure-building ball to reversely discharge to the ground along with the fracturing fluid, and realizing water control production through each switchable inflow control device.
According to the combined implementation method for fracturing and water control production, the combined implementation pipe column is adopted to perform fracturing and water control production, so that water control production can be realized when the depth of an oil well is deep, and the oil yield of the oil well with deep depth is improved.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a combined embodiment of a column according to the present invention;
FIG. 2 is a schematic diagram of a switchable inflow control device of a co-operating column according to an embodiment of the present invention;
fig. 3 is an enlarged schematic view of a portion a in fig. 2.
Description of reference numerals: 1. a tubular column body; 2. hanging a packer; 3. a ball seat; 4. an open hole packer; 5. self-closing fracturing sliding sleeves; 6. a switchable inflow control device; 61. a water control assembly; 62. a water intake assembly; 611. a first center tube; 612. an outer tube; 613. a first sliding tube; 614. a through hole; 615. a first positioning groove; 616. a second positioning groove; 617. a limiting groove; 618. a first elastic jaw; 619. a second elastic jaw; 621. a second center tube; 622. a screen pipe; 623. and (6) butting the plug.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
In order to make the objects, technical solutions and effects of the present invention more clear, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a combined implementation string according to an embodiment of the present invention, as shown in fig. 1, the combined implementation string includes a string body 1, a suspended packer 2, a ball seat 3, a plurality of open hole packers 4, a plurality of self-closing fracturing sliding sleeves 5, and a plurality of switchable inflow control devices 6. The hanging packer 2 is arranged at one end of the pipe column body 1, and the ball seat 3 is arranged at the other end of the pipe column body 1. A plurality of open hole packers 4, a plurality of self-closing fracturing sliding sleeves 5 and a plurality of switchable inflow control devices 6 are all arranged on the tubular column body 1 and are positioned between the hanging packers 2 and the ball seats 3. Wherein, all be equipped with self-closing fracturing sliding sleeve 5 and switching formula inflow control device 6 between per two adjacent bore hole packers 4, also be equipped with self-closing fracturing sliding sleeve 5 and switching formula inflow control device 6 between ball seat 3 and the bore hole packer 4 rather than the nearest.
The self-closing fracturing sliding sleeve 5 is a fracturing sliding sleeve which can automatically close a fracturing hole without tools such as a coiled tubing and the like, in the prior art, the self-closing of the fracturing sliding sleeve is mainly realized through the pressure change in the tubular column body 1, and the specific structure of the self-closing fracturing sliding sleeve 5 is explained below. Inflow Control Devices (ICDs) can generate additional pressure drops that generate additional pressure depending on the frictional resistance of the fluid as it passes through. The flow rate of the fluid is in direct proportion to the additional pressure drop, and the larger the flow rate of the fluid passing through the inflow control device is, the larger the additional pressure drop is generated, so that the flow rate can be automatically adjusted, and the flow rate of each oil outlet section of the horizontal well tends to be balanced. In the present invention, the inflow control device is modified to be switchable. When in fracturing operation, the switchable inflow control device 6 is closed, so that fracturing fluid can be prevented from entering the stratum from the switchable inflow control device 6; when controlling water production, close self-closing fracturing sliding sleeve 5, can avoid the water in the stratum to get into in the tubular column body 1 from fracturing sliding sleeve, avoid it to influence accuse water effect.
According to the combined implementation pipe column for fracturing and water control production, firstly, an oil well is divided into a plurality of oil outlet sections through the ball seat 3 and the open hole packer 4 according to the distribution rule of permeability along a horizontal well, and each oil outlet section forms a relatively independent flowing space. The self-closing fracturing sliding sleeves 5 are respectively arranged in each oil outlet section to perform staged fracturing, and the staged fracturing can improve the permeability of a reservoir stratum and achieve the effect of improving the yield of an oil well. In addition, switchable inflow control devices 6 are arranged in the oil outlet sections to realize segmented water control of the horizontal well, so that the pressure profile of the horizontal well is balanced, the heterogeneous reservoir layer can uniformly produce oil, the bottom water coning is delayed, and the oil production and recovery ratio of the oil-gas well are improved. The combined implementation tubular column of the invention applies the switchable inflow control device 6 to each oil outlet section separated by staged fracturing, avoids the mode of continuously opening or closing a fracturing sliding sleeve by using a continuous oil pipe to realize water control production, is not limited by the depth of an oil well any more, can control water production even if the depth of the oil well is more than 7500m, and greatly improves the oil yield of the oil well. Further, through the setting of self-closing fracturing sliding sleeve 5 and switchable inflow control device 6, the influence of the inflow control device on the fracturing operation can be effectively prevented, and the influence of the fracturing sliding sleeve on water control production can be effectively prevented.
Preferably, in a plurality of oil outlet sections separated by the ball seat 3 and the open hole packer 4, one self-closing fracturing sliding sleeve 5 can be matched with a plurality of switchable inflow control devices 6 in each oil outlet section, so that the water control effect in the later oil production process can be further enhanced.
Fig. 2 is a schematic diagram of a switchable inflow control device of a combined implementation column according to an embodiment of the present invention, and fig. 3 is an enlarged view of a portion a of fig. 2. As shown in fig. 2 and 3, the switchable inflow control device 6 includes a water control assembly 61 and a water inlet assembly 62. The water control assembly 61 includes a first central tube 611 connected to the column body 1, an outer tube 612 sleeved on the first central tube 611, and a first sliding tube 613 disposed in the first central tube 611, wherein one end of the outer tube 612 is connected to the first central tube 611, a first annular flow passage is formed between the outer tube 612 and the first central tube 611, the first sliding tube 613 has a first position and a second position in the first central tube 611, and a through hole 614 is disposed on an outer wall of the first central tube 611 corresponding to the second position. One end of the water inlet assembly 62 is sealingly connected to the outer tube 612 for directing fluid from the oil formation into the first annular flow passage. In this embodiment, the outer jacket is threadedly coupled to the first center tube 611. Wherein when the first sliding pipe 613 is in the first position, the first sliding pipe 613 opens the through hole 614 and communicates the first annular flow passage with the first center pipe 611 to allow fluid from the oil layer to enter the first center pipe 611 after passing through the water inlet assembly 62, the first annular flow passage and the through hole 614 in sequence; when the first sliding tube 613 is in the second position, the first sliding tube 613 blocks the through hole 614 so that fluid from the oil layer cannot enter the first center tube 611. In the process of combining the staged fracturing technology with the inflow control device, the inventor finds that because the inflow control device also communicates the pipe column body 1 with the stratum, the fracturing fluid can enter the stratum from the inflow control device, so that the fracturing effect is affected. Therefore, the inventor is through many times of experiments and tests, the inflow control device among the prior art is reformed transform, finally change the inflow control device among the prior art into but switch formula inflow control device 6 for having above-mentioned structure, it can effectively avoid fracturing fluid to get into the stratum from inflow control device, further guarantee the fracturing effect, be favorable to the improvement of oil production volume, simultaneously, but the operation that switch formula inflow control device 6 such structural design makes its open and close is all very simple and convenient, constructor's operating efficiency has been improved.
Preferably, a first positioning groove 615, a second positioning groove 616 and a limiting groove 617 which are axially spaced and sequentially far away from the water inlet assembly 62 are arranged on the inner wall of the first center tube 611, and a first elastic claw 618 and a second elastic claw 619 are respectively arranged at two ends of the first sliding tube 613, wherein when the first sliding tube 613 is at the first position, the first elastic claw 618 is engaged in the first positioning groove 615, the second elastic claw 619 is engaged in the second positioning groove 616, and when the first sliding tube 613 is at the second position, the first elastic claw 618 is engaged in the second positioning groove 616, and the second elastic claw 619 is engaged in the limiting groove 617. The first and second elastic jaws 618 and 619 enable the first sliding tube 613 to be stably engaged in the first or second position and enable the process of changing the position of the first sliding tube 613 not to be excessively difficult.
The water inlet assembly 62 comprises a sieve pipe 622, a docking plug 623 and a second base pipe 621 communicated with the pipe column body 1, the sieve pipe 622 and the docking plug 623 are sequentially sleeved and connected to the second base pipe 621 along the axial direction of the second base pipe 621, the sieve pipe 622 is connected with a first end of the docking plug 623, a second end of the docking plug 623 is inserted into the outer pipe 612 and is connected with the inner peripheral wall of the outer pipe 612 in a sealing manner, and the second base pipe 621 exposes out of the second end of the docking plug 623 and is connected with the first base pipe 611; the screen 622 and the docking plug 623 together form a second annular flow passage with the second base pipe 621, the second annular flow passage is in communication with the first annular flow passage, and the screen 622 has a screen aperture therein to allow fluid from the reservoir to pass through the screen 622 into the second annular flow passage and then into the first annular flow passage.
In this embodiment, when performing a fracturing operation, the first elastic claw 618 and the second elastic claw 619 of the switch sliding sleeve are respectively located at the second positioning groove 616 and the limiting groove 617, and the switchable inflow control device 6 is in a closed state. When water control production needs to be started, an opening tool is put into the tubular column body 1 and is pressed, so that the first sliding pipe 613 moves downwards, the first elastic claw 618 and the second elastic claw 619 at the two ends of the first sliding pipe 613 are respectively positioned in the first positioning groove 615 and the second positioning groove 616, and the switchable inflow control device 6 is in an open state.
The self-closing fracturing sliding sleeve 5 comprises a third central pipe connected with the tubular column body 1, a sleeve arranged in the third central pipe and capable of axially reciprocating along the third central pipe, a driving assembly used for driving the sleeve and an elastic resetting member arranged in the third central pipe, wherein a fracturing hole capable of communicating an inner cavity of the third central pipe with a stratum is formed in the side wall of the third central pipe. When the pressure in the third central pipe is greater than the preset opening pressure, the driving assembly can drive the sleeve to move from the position for closing the fracturing hole to the position for opening the fracturing hole; when the pressure in the third central tube is reduced to be less than the preset opening pressure, the sleeve can be pushed from the position of opening the fracturing hole to the position of closing the fracturing hole under the action of the elastic resetting component. Of course, the self-closing fracturing sliding sleeve 5 can be provided in other structural forms, and the skilled person can select the self-closing fracturing sliding sleeve according to the actual needs.
In this embodiment, the self-closing fracturing sliding sleeve 5 arranged between the ball seat 3 and the open hole packer 4 closest to the ball seat is a differential pressure type switch sliding sleeve, and the rest of the self-closing fracturing sliding sleeves 5 are ball throwing type switch sliding sleeves. Differential pressure formula switch sliding sleeve is a level pressure sliding sleeve, relies on the inside effect of the pressure differential that produces of tubular column to open, and throws ball formula switch sliding sleeve and need open through throwing into fracturing ball, the effort that relies on inside liquid column of whole tubular column and well head pressure boost to produce. For a horizontal well fractured in a staged way by naked eyes, a differential pressure type switch sliding sleeve is used between the ball seat 3 and the naked eye packer 4 closest to the ball seat instead of a ball throwing type switch sliding sleeve, so that the condition that a fracturing ball cannot be pumped to the tail end of the pipe column body 1 can be avoided.
The invention also provides a combined implementation method of fracturing and water control production, which comprises the following steps:
step 1, putting the combined implementation pipe column connected with the drilling rod into an oil well through the drilling rod, setting and suspending packers 2 and each open hole packer 4 after slurry replacing operation is carried out, and replacing the drilling rod by using a back-inserting pipe column;
step 2, injecting fracturing fluid into the back-plugging string and putting a pressure-building ball into the back-plugging string to perform staged fracturing operation, sequentially opening the self-closing fracturing sliding sleeves 5 according to the sequence from the part close to the ball seat 3 to the part far away from the ball seat 3, and ensuring that the latter self-closing fracturing sliding sleeve 5 is opened again after the former self-closing fracturing sliding sleeve 5 is closed;
and 3, forcing the pressure-building ball to reversely discharge to the ground along with the fracturing fluid, and realizing water control production through each switchable inflow control device 6.
In step 1, during the slurry replacement operation, it is necessary to replace the slurry in the well casing with completion fluid to a position of about 200m above the suspended packer.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
In the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In this application, unless expressly stated or limited otherwise, the terms "connected," "communicating," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A combined implementation pipe column for fracturing and water control production is characterized by comprising a pipe column body, a hanging packer arranged at one end of the pipe column body, a ball seat arranged at the other end of the pipe column body, a plurality of open hole packers, a plurality of self-closing fracturing sliding sleeves and a plurality of switchable inflow control devices, wherein the open hole packers, the self-closing fracturing sliding sleeves and the switchable inflow control devices are arranged on the pipe column body and are positioned between the hanging packer and the ball seat; the self-closing type fracturing sliding sleeve and the switchable inflow control device are arranged between every two adjacent open hole packers, and the self-closing type fracturing sliding sleeve and the switchable inflow control device are also arranged between the ball seat and the open hole packer closest to the ball seat.
2. The co-delivery string of claim 1, wherein the switchable inflow control device comprises:
the water control assembly comprises a first central pipe communicated with the pipe column body, an outer pipe sleeved on the first central pipe and a first sliding pipe arranged in the first central pipe, one end of the outer pipe is connected with the first central pipe, a first annular flow passage is formed between the outer pipe and the first central pipe, the first sliding pipe is provided with a first position and a second position in the first central pipe, and the outer wall of the first central pipe corresponding to the second position is provided with a through hole;
one end of the water inlet assembly is hermetically connected with the other end of the outer pipe and is used for guiding fluid from an oil layer into the first annular flow passage;
wherein when the first sliding tube is in a first position, the first sliding tube opens the through hole and places the first annular flow passage in communication with the first center tube to allow fluid from the oil formation to enter the first center tube after passing through the water intake assembly, first annular flow passage, and through hole in sequence;
when the first sliding pipe is in the second position, the first sliding pipe blocks the through hole, so that fluid from the oil layer cannot enter the first central pipe.
3. The joint implementation tubular column of claim 2, wherein a first positioning groove, a second positioning groove and a limiting groove are formed on the inner wall of the first central tube, the first positioning groove, the second positioning groove and the limiting groove are axially spaced apart and sequentially away from the water inlet assembly, a first elastic claw and a second elastic claw are respectively formed at two ends of the first sliding tube, wherein when the first sliding tube is at the first position, the first elastic claw is clamped in the first positioning groove, the second elastic claw is clamped in the second positioning groove, and when the first sliding tube is at the second position, the first elastic claw is clamped in the second positioning groove, and the second elastic claw is clamped in the limiting groove.
4. The joint implementation string of claim 2, wherein the water inlet assembly comprises a screen pipe, a docking plug and a second base pipe communicated with the string body, the screen pipe and the docking plug are sequentially sleeved and connected to the second base pipe along the axial direction of the second base pipe, the first ends of the screen pipe and the docking plug are connected, the second end of the docking plug is inserted into the outer pipe and is in sealed connection with the inner peripheral wall of the outer pipe, and the second base pipe is exposed out of the second end of the docking plug and is connected with the first base pipe; and a second annular flow passage is formed between the sieve tube and the butt joint plug and the second base pipe, the second annular flow passage is communicated with the first annular flow passage, and fluid in an oil layer can sequentially enter the second annular flow passage and the first annular flow passage after passing through the sieve tube.
5. The combined implementation string of any one of claims 1-4, wherein the self-closing fracturing sliding sleeve arranged between the ball seat and the open hole packer closest to the ball seat is a differential pressure type switch sliding sleeve, and the rest self-closing fracturing sliding sleeves are ball throwing type switch sliding sleeves.
6. The combined implementation string of any one of claims 1 to 4, wherein the self-closing fracturing sliding sleeve comprises a third central pipe connected with the string body, a second sliding pipe arranged in the third central pipe and capable of reciprocating along the axial direction of the third central pipe, a driving assembly for driving the second sliding pipe and an elastic resetting member arranged in the third central pipe, and a fracturing hole capable of communicating the inner cavity of the third central pipe with the stratum is formed in the side wall of the third central pipe;
when the pressure in the third central pipe is greater than a preset opening pressure, the driving assembly can drive the second sliding pipe to move from a position for closing the fracturing hole to a position for opening the fracturing hole; when the pressure in the third central tube is reduced to be less than the preset opening pressure, the second sliding tube can be pushed from the position of opening the fracturing hole to the position of closing the fracturing hole under the action of the elastic resetting component.
7. A combined implementation method for fracturing and water control production is characterized by comprising the following steps:
step 1, running the combined implementation pipe string of any one of claims 1-6 connected with the combined implementation pipe string into an oil well through a drill pipe, setting the suspension packer and each open hole packer after slurry replacing operation is carried out, and replacing the drill pipe with a back-plugging pipe string;
step 2, injecting fracturing fluid into the back-plugging string and putting a pressure-building ball into the back-plugging string to perform staged fracturing operation, sequentially opening the self-closing fracturing sliding sleeves according to a sequence from the position close to the ball seat to the position far away from the ball seat, and ensuring that the latter self-closing fracturing sliding sleeve is opened again after the former self-closing fracturing sliding sleeve is closed;
and 3, forcing the pressure-building ball to reversely discharge to the ground along with the fracturing fluid, and realizing water control production through each switchable inflow control device.
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| CN201810305956.0A CN108397181B (en) | 2018-04-08 | 2018-04-08 | Combined implementation pipe column and method for fracturing and water control production |
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| CN201810305956.0A CN108397181B (en) | 2018-04-08 | 2018-04-08 | Combined implementation pipe column and method for fracturing and water control production |
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| CN108397181B true CN108397181B (en) | 2020-06-12 |
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| WO2017058258A1 (en) * | 2015-10-02 | 2017-04-06 | Halliburton Energy Services, Inc. | Remotely operated and multi-functional down-hole control tools |
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