CN111706304A - Filling tool with reverse circulation function - Google Patents
Filling tool with reverse circulation function Download PDFInfo
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- CN111706304A CN111706304A CN202010618570.2A CN202010618570A CN111706304A CN 111706304 A CN111706304 A CN 111706304A CN 202010618570 A CN202010618570 A CN 202010618570A CN 111706304 A CN111706304 A CN 111706304A
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- filling
- pipe
- mandrel
- sealing
- sealing mandrel
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- 230000002441 reversible effect Effects 0.000 title claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 148
- 210000002445 nipple Anatomy 0.000 claims abstract description 61
- 230000001681 protective effect Effects 0.000 claims abstract description 36
- 239000007788 liquid Substances 0.000 claims description 28
- 239000011229 interlayer Substances 0.000 claims description 19
- 238000003780 insertion Methods 0.000 claims description 17
- 230000037431 insertion Effects 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 16
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 32
- 238000005406 washing Methods 0.000 description 14
- 239000003292 glue Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000011796 hollow space material Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/04—Gravelling of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B34/10—Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to a filling tool with a reverse circulation function, and belongs to the technical field of downhole operation tools of oil and gas wells. The filling tool comprises a central pipe, an upper joint, a long outer pipe, a filling short section, a three-way short section and a lower mandrel; one end of the filling short section is provided with a long sealing mandrel through a double-double short section; the other end is provided with a double-sealing ring mandrel through a lower mandrel and a short sealing mandrel, and one end of the double-sealing ring mandrel is provided with a reducing sealing mandrel through a tee joint nipple. When the filling tool is used for filling, the protective pipe can effectively reduce the hidden trouble that the tool is broken by impact, the service life of the tool is prolonged, and the unique bypass flow channel is designed to provide a separate channel for filling and reverse circulation, so that the filling safety is ensured; the packer has the characteristics of realizing filling, reverse circulation, setting of an isolation packer and the like.
Description
Technical Field
The invention relates to a filling tool with a reverse circulation function, and belongs to the technical field of downhole operation tools of oil and gas wells.
Background
Sandstone oil reservoir is a good oil reservoir, and because of long-term exploitation, the reason of the oil reservoir itself and artificial unreasonable factors, sand can be produced due to unbalanced stress in the bottom layer of the sandstone oil reservoir in the middle and later stages of oil field development. The conventional sand prevention modes comprise two modes: one is mechanical sand control; the other is chemical sand control. The chemical sand control is to extrude a certain amount of chemical filler into the stratum and make it enter the pores of the stratum to fill and consolidate the stratum, thereby improving the strength of the stratum. However, the method has certain damage to the formation permeability, particularly during repeated construction, the cost is high, chemical filling agents are easy to pollute a shaft, and in addition, the injected chemical filling agents have an aging phenomenon, so that the effective period is short.
Compared with chemical sand control, the mechanical sand control gravel pack sand control is more economic, a reservoir is not damaged by cement slurry, stratum sand migration is effectively prevented, a low permeability zone close to a well hole is prevented from being formed by the stratum sand migration, meanwhile, the stratum can be supported to prevent the well wall from collapsing, the mechanical sand control adopted in the market at present is a single-layer sand control mode and a layer-by-layer sand control mode, redundant gravel remained in the oil pipe needs to be washed out after the pack is completed, and the pipe column does not have an independent reverse circulation channel, so that the pipe column needs to be lifted to a well mouth after the sand control is completed, the gravel remained in the oil pipe can be washed out, and the mode is complex in operation and long in time consumption; therefore, there is a need for improvement thereof.
Disclosure of Invention
The invention aims to: the filling tool with the reverse circulation function is high in filling speed and efficiency, achieves the aim of sand prevention through the established positive circulation channel, and recognizes that reverse circulation sand washing operation is carried out through lifting of the pipe column.
The technical scheme of the invention is as follows:
a filling tool with a reverse circulation function comprises a central pipe, an upper joint, a long outer pipe, a filling short section, a three-way short section and a lower mandrel; the method is characterized in that: one end of the filling short section is provided with a long sealing mandrel through a double-double short section; the end head of the long sealing mandrel is provided with an upper joint through the long outer pipe; install the intermediate layer pipe in the long outer tube, the center tube is installed through the intermediate head to the intermediate layer pipe end, fills the other end of nipple joint and installs double containment ring dabber through lower dabber and short sealed dabber, and double containment ring dabber one end is installed the sealed dabber of reducing through the tee bend nipple joint, and sealed dabber F is installed to the sealed dabber end of reducing.
The double-meter short section is in threaded connection with the filling short section; the long sealing mandrel is composed of a sealing mandrel A, a sealing mandrel B, a sealing mandrel C, a sealing mandrel D and a sealing mandrel E, and the sealing mandrel A, the sealing mandrel B, the sealing mandrel C, the sealing mandrel D and the sealing mandrel E are in threaded connection with each other; the sealing mandrel A is in threaded connection with the double-mu short section; the sealing mandrel E is in threaded connection with the long outer pipe; the upper joint is in threaded connection with the long outer pipe;
and the double-mu short section, the long outer tube, the sealing mandrel A, the sealing mandrel B, the sealing mandrel C, the sealing mandrel D and the sealing mandrel E are respectively provided with an outer sealing assembly.
The middle joint is respectively in threaded connection with the interlayer pipe and the central pipe, and one end of the central pipe is in threaded connection with the filling short section.
The interlayer pipe is internally provided with an insertion pipe in a sliding way, one end of the insertion pipe extends into the upper joint, and a sealing ring is arranged between the interlayer pipe and the insertion pipe.
Fill nipple joint and lower mandrel threaded connection, lower dabber, short sealed dabber, double seal ring dabber, tee bend nipple joint, reducing sealed dabber, sealed dabber F between threaded connection in proper order, lower dabber, short sealed dabber, double seal ring dabber, tee bend nipple joint, reducing sealed dabber, sealed dabber F on be provided with the external seal assembly respectively.
The outer seal assembly is composed of an assembly ring and seal rings uniformly distributed on the circumference of the assembly ring.
The filling short section is a diameter-variable body, and filling holes are uniformly distributed on the circumference of the middle part of the filling short section in the radial direction; the filling hole is communicated with the central hole; a pipe wall of the filling nipple is symmetrically and axially provided with a nipple bypass hole; a protective pipe is arranged in a center hole of the filling nipple corresponding to the filling hole, and a protective pipe through hole is formed in the circumference of the protective pipe and corresponds to the filling hole; the protective pipe is connected with the plug and the filling short section through a set screw.
A plug is arranged in the internal thread of the filling nipple at one side of the filling hole, and one end of the plug extends into the lower mandrel; the plug is a reducing cup-shaped body.
And a ball valve body is arranged in the central holes of the three-way short section and the double-sealing ring mandrel through a valve seat, and a spring is arranged on the ball valve body through a spring seat.
The circumference of the three-way pipe nipple is symmetrically provided with pipe nipple through holes which are communicated with a central hole of the three-way pipe nipple; and the pipe walls of the three-way pipe nipples on the two sides of the central hole are axially provided with three-way pipe nipple bypass holes. One end of a center hole of the three-way pipe nipple is in a plugging shape.
One end of the spring seat is in threaded connection with the valve seat, and the other end of the spring seat is connected with the double-sealing ring core shaft.
The circumference of the ball valve body is provided with a liquid flow hole.
The invention has the beneficial effects that:
this fill instrument with reverse circulation function's intermediate layer intraductal intubate that is provided with, when upper end tubular column was connected with this filling instrument, directly can insert through the intubate, played the sealed effect of inserting, and simple, swift realization tubular column is sealed. During filling operation, the protective pipe is arranged inside the filling nipple and made of alloy materials, erosion resistance of the protective pipe is improved, abrasion of filling liquid to a filling tool is reduced, hidden danger that the tool is broken by impact is effectively reduced, the service life of the tool is prolonged, and the design of the protective pipe through hole in the protective pipe and a specific inclination angle in the liquid flow direction is beneficial to liquid flow to pass through the protective pipe through hole along the pipe wall, and great impact force on parts caused by sudden large-angle turning of the liquid flow is reduced. The unique bypass flow channel is designed to provide an independent channel for filling and reverse circulation, so that the filling safety is ensured; the packer has the characteristics of realizing filling, reverse circulation, setting of an isolation packer and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is an enlarged view of the structure at B in FIG. 1;
FIG. 4 is an enlarged view of the structure at C in FIG. 1;
FIG. 5 is an enlarged view of the structure shown at D in FIG. 1;
FIG. 6 is a schematic sectional view taken along line A-A in FIG. 1 or FIG. 4;
FIG. 7 is a schematic view of a cross-sectional view taken along line B-B in FIG. 1 or FIG. 5;
FIG. 8 is a schematic view of the filling operation (positive cycle) of the present invention;
FIG. 9 is a schematic diagram of the reverse loop state of the present invention.
In the figure: 1. a central tube, 2, an upper joint, 3, a long outer tube, 4, a filling short section, 5, a three-way short section, 6, a lower mandrel, 7, a double-mu short section, 8, a sealing mandrel A, 9, a sealing mandrel B, 10, a sealing mandrel C, 11, a sealing mandrel D, 12, a sealing mandrel E, 13, a sandwich tube, 14, a middle joint, 15, an overflowing hole, 16, an insertion tube, 17, a short sealing mandrel, 18, a double-sealing ring mandrel, 19, a reducing sealing mandrel, 20, a sealing mandrel F, 21, an outer sealing assembly, 22, a short section hole, 23, a bypass hole, 24, a protective tube, 25, a set screw, 26, a plug, 27, an upper hollow space, 28, a valve seat, 29, a ball valve body, 30, a spring seat, 31, a spring, 32, a liquid flow hole, 33, a short section through hole, 34, a three-way bypass hole, 35, a lower hollow space, 36, a filling sliding sleeve, 37 and a; 38. and (6) perforating.
Detailed Description
The filling tool with the reverse circulation function comprises a central pipe 1, an upper joint 2, a long outer pipe 3, a filling short section 4, a three-way short section 5 and a lower core shaft 6. One end of the filling short section 4 is provided with a long sealing mandrel through a double short section 7; the end of the long sealing mandrel is provided with an upper joint 2 through a long outer tube 3. The long sealing mandrel is composed of a sealing mandrel A8, a sealing mandrel B9, a sealing mandrel C10, a sealing mandrel D11 and a sealing mandrel E12, and the sealing mandrel A8, the sealing mandrel B9, the sealing mandrel C10, the sealing mandrel D11 and the sealing mandrel E12 are in threaded connection with one another; one end of the sealing mandrel A8 is in threaded connection with the double-mu short section 7; the double-nipple joint 7 is in threaded connection with the filling nipple joint 4;
one end of the sealing mandrel E12 is in threaded connection with the long outer pipe 3; the upper joint 2 is in threaded connection with the long outer pipe 3; the long outer pipe 3 is internally provided with an interlayer pipe 13, the end of the interlayer pipe 13 is provided with a central pipe 1 through an intermediate joint 14, and the intermediate joint 14 is respectively in threaded connection with the interlayer pipe 13 and the central pipe 1; one end of the central tube 1 is in threaded connection with the filling nipple 4 so as to axially limit the interlayer tube 13, the intermediate joint 14 and the central tube 1. An upper annular space 27 is arranged between the interlayer pipe 13 and the long outer pipe 3, between the middle joint 14 and the central pipe 1 and the long outer pipe 3, and between the interlayer pipe 13 and the long outer pipe 3, and the long sealing mandrel, an overflowing hole 15 is arranged on the circumference of the end head of the interlayer pipe 13, and the overflowing hole 15 is communicated with the annular space; an insertion tube 16 is slidably mounted in the interlayer tube 13, one end of the insertion tube 16 extends into the upper joint 2, and a sealing ring is arranged between the interlayer tube 13 and the insertion tube 16. Limiting bosses are respectively arranged between contact surfaces of the interlayer pipe 13 and the insertion pipe 16, and the insertion pipe 16 cannot slide downwards (rightwards) through the mutual matching of the limiting bosses on the interlayer pipe 13 and the insertion pipe 16, so that the insertion pipe 16 is axially limited.
The other end of the filling short section 4 is provided with a double-sealing ring mandrel 18 through a lower mandrel 6 and a short sealing mandrel 17, one end of the double-sealing ring mandrel 18 is provided with a reducing sealing mandrel 19 through a three-way short section 5, the end of the reducing sealing mandrel 19 is provided with a sealing mandrel F20, the filling short section 4 is in threaded connection with the lower mandrel 6, the short sealing mandrel 17, the double-sealing ring mandrel 18, the three-way short section 5, the reducing sealing mandrel 19 and the sealing mandrel F20 are sequentially in threaded connection.
The filling short section 4, the double-diameter short section 7, the long outer tube 3, the sealing mandrel A8, the sealing mandrel B9, the sealing mandrel C10, the sealing mandrel D11 and the sealing mandrel E12 are respectively provided with an outer sealing assembly 21 on the lower mandrel 6, the short sealing mandrel 17, the double-sealing ring mandrel 18, the three-way short section 5, the reducing sealing mandrel 19 and the sealing mandrel F20; the outer seal assembly 21 is composed of an assembly ring and seal rings uniformly distributed on the circumference of the assembly ring. To form multiple seals on the filling tool.
The filling short section 4 of the filling tool is a reducing body, and filling holes 22 are uniformly distributed on the circumference of the middle part of the filling short section 4 in the radial direction; the filling hole 22 is communicated with the central hole of the filling short section 4; pipe walls of the filling nipples 4 on two sides of the central hole are symmetrically and axially provided with nipple bypass holes 23; the nipple bypass orifice 23 communicates with the upper annulus 27.
A protective pipe 24 is arranged in the central hole of the filling nipple 4 corresponding to the filling hole 22, and a protective pipe through hole is formed in the circumference of the protective pipe 24 and corresponds to the filling hole 22; a plug 26 is arranged in the internal thread of the filling nipple 4 at one side of the filling hole 22, and the plug 26 is a reducing cup-shaped body; one end of the plug 26 extends into the lower core shaft 6; the plug 26 is matched with the filling nipple 4 to clamp the protective pipe 24; the protective pipe 24 is fixedly connected with the plug 26 and the filling nipple 4 through a set screw 25.
A ball valve body 29 is arranged in the central hole of the three-way nipple 5 and the central hole of the double-sealing ring mandrel 18 of the filling tool through a valve seat 28, and a spring 31 is arranged on the ball valve body 29 through a spring seat 30. One end of the spring seat 30 is in threaded connection with the valve seat 28, and the other end of the spring seat 30 is in threaded connection with the double seal ring mandrel 18. The ball valve body 29 is cylindrical, a ball head is arranged at the end of the ball valve body 29, and a liquid flow hole 32 is radially arranged on the circumference of the ball valve body 29. The ball head is connected with the valve seat 28 in a sliding and sealing mode.
The circumference of a three-way nipple 5 of the filling tool is symmetrically provided with nipple through holes 33, and the nipple through holes 33 are communicated with a central hole of the three-way nipple 5; one end of a central hole of the three-way pipe nipple 5 is in a plugging shape; and the pipe walls of the three-way pipe nipple 5 on two sides of the central hole are axially provided with three-way pipe nipple bypass holes 34 so as to communicate two sides of the three-way pipe nipple 5. And a lower annular space 35 is arranged between the spring seat 30, the valve seat 28 and the double-sealing ring mandrel 18, and the lower annular space 35 is communicated with the through joint bypass hole 34.
The filling tool can be divided into a filling mechanism, a reverse circulation mechanism and a sealing mechanism according to functions;
a filling mechanism: the device comprises a protective pipe 24, a filling short section 4, a plug 26, a lower mandrel 6 and a three-way short section 5. When the filling tool works, when filling liquid enters the filling tool from an oil pipe, the filling liquid is blocked at the plug 26 and flows out through the protective pipe through hole of the protective pipe 24 and the filling hole 22 of the filling short section 4, the protective pipe 24 plays a role in protecting the filling short section 4 when the filling liquid flows out, the protective pipe through hole of the protective pipe 24 is designed to be a certain oblique angle so as to facilitate the liquid to pass through the protective pipe through hole along the pipe wall, the large impact force on the filling short section 4 caused by sudden large-angle turning of the liquid flow is reduced, the protective pipe 24 is made of alloy materials so as to increase the erosion resistance of the protective pipe 24, the filling tool is prevented from being broken by the liquid during long-time filling operation, and the subsequent maintenance risk is increased;
reverse circulation mechanism: the device comprises a protective pipe 24, a filling short section 4, a plug 26, a valve seat 28, a ball valve body 29, a spring 31, a spring seat 30 and a three-way short section 5; during reverse circulation, liquid is upwards discharged through the nipple through hole 33 of the three-way nipple 5, and reverse circulation of the liquid is realized.
A sealing mechanism: the three-way pipe joint is composed of a filling short section 4, a double-mu short section 7, a long outer pipe 3, a sealing mandrel A8, a sealing mandrel B9, a sealing mandrel C10, a sealing mandrel D11, an upper sealing mandrel E12, a lower sealing mandrel 6, a short sealing mandrel 17, a double-sealing ring mandrel 18, a three-way short section 5, a reducing sealing mandrel 19 and a sealing mandrel F20, wherein the outer sealing assemblies 21 are respectively arranged on the upper sealing mandrel, the lower sealing mandrel, the short sealing mandrel, the double-sealing ring mandrel E12, the lower sealing; the provision of outer seal assemblies 21, each forming a plurality of seals for the filling tool; not only provides the filling channel to the greatest extent to through many times closely, can prevent effectively that when carrying the tubular column from top to bottom, avoid certain sealed inefficacy, make the condition of different layers of oil reservoir intercommunication.
When the filling tool works, the filling tool is connected with a pipe column through the upper connector 2, wherein the insertion pipe 16 is inserted into the pipe column so as to ensure the tightness of the connection; the filling tool is connected with a reverse circulation valve, a flushing pipe and the like (not shown) through a sealing mandrel F20 to form a tool string, and then the tool string is lowered to a preset downhole position (filling operation position) together with an isolation packer; during filling operation (positive cycle); the filling tool cooperates with the load indicator and, by means of the correct positioning of the load indicator, reaches a predetermined position, the filling tool is adapted to a sealing dimension of 3.88 ", providing, to the greatest possible extent, sufficient access for the filling operation. The method specifically comprises the following steps:
pumping glue solution carrying gravels with a certain concentration into the filling nipple 4 through a central hole of the tubular column, the insertion tube 16, the interlayer tube 13, the intermediate joint 14 and the central tube 1; one end of the central hole of the filling nipple 4 is provided with a plug 26; under the blocking action of the plug 26, the glue solution entering the filling short section 4 flows out from the protective tube through hole of the protective tube 24 and the filling hole 22 of the filling short section 4 and enters an annulus between the filling tool and the isolation packer to continuously descend. At this time, the perforation 38 on the filling sliding sleeve 36 of the isolation packer is in an open state (the opening and closing of the perforation 38 are realized by pressing and lifting the pipe column, namely, the pipe column is pressed down to realize the sliding of the switch tool 37 through the hooking of the filling tool, so that the switch tool 37 is in a state of releasing the blocking of the perforation 38, the opening of the perforation 38 is realized, and the pipe column is lifted to realize the blocking of the perforation 38 by the switch tool 37 through the hooking of the filling tool, so that the perforation 38 is closed).
Because the filling nipple 4 of the filling tool is provided with the outer sealing assembly 21, the outer sealing assembly 21 is matched with the inner wall of the isolation packer to form sealing; the glue solution entering the annulus between the filling tool and the isolation packer filling sliding sleeve 36 is blocked by the outer sealing assembly 21 and cannot continue to descend; thus, pressure is built up in the annular space, and when the pressure built up reaches a certain value, the pressure built up flows out from the perforation 38 and enters the annular space (operation section) between the isolation packer and the borehole; and (3) glue solution entering an annulus between the isolation packer and the borehole, wherein gravel in the glue solution is deposited in the annulus to form an artificial sand blocking barrier until the whole sand control section is covered. The cement (containing very little small-diameter gravel) that completes the gravel deposition reenters the central bore of the packing tool through the screen and the perforated pipe and reverse circulation valve at the bottom of the packing tool.
The glue solution entering the central hole of the filling tool passes through the central holes of the sealing mandrel F20 and the reducing sealing mandrel 19, then passes through the tee joint short section bypass hole 34 of the tee joint short section 5 and the lower annular space 35 to enter the central holes of the short sealing mandrel 17 and the lower mandrel 6, and then returns to the ground through the short section bypass hole 23 of the filling short section 4 and the upper annular space 27, so that a positive circulation channel is established, and the aim of gravel filling sand prevention operation is fulfilled.
After the filling operation is finished, the pipe column is lifted to a reverse circulation position, and then the reverse circulation sand washing operation can be carried out, wherein the purpose of the reverse circulation sand washing operation is to return redundant gravel retained in the oil pipe to the ground through a single reverse circulation channel provided by the filling tool. During reverse circulation sand washing operation; perforations 38 are in a closed state; the sand washing liquid is pumped into the upper annular space 27 of the filling tool from the ground, and the sand washing liquid entering the upper annular space 27 enters the central hole of the short sealing mandrel 17 through the nipple bypass hole 23 of the filling nipple 4 and the lower mandrel 6.
In the process, as the reverse circulation valve at the bottom of the filling tool is in a closed state, the sand washing liquid entering the short sealing mandrel 17 forms a pressure-building effect; when the sand washing hydraulic pressure reaches a certain value, the ball valve body 29 is pushed to move downwards (to the right) and the spring 31 is compressed, so that the sealing connection state between the ball head and the valve seat 28 is released. After the sealing connection state is released, the sand washing liquid enters the ball valve body 29 from a gap between the ball valve body 29 and the valve seat 28 and the liquid flow hole 32 and then enters the three-way nipple 5, and in the process, one end of a central hole of the three-way nipple 5 is in a blocking shape; under the action of pressure, the sand washing liquid entering the three-way nipple 5 enters an annular space between the filling tool and the isolation packer through the nipple through hole 33, and one end of the three-way nipple 5 is in a sealing state with the isolation packer under the action of the external sealing assembly 21; the sand washing liquid entering the filling tool and the isolated packer annular space moves upwards along the annular space under the action of pressure, the upward sand washing liquid enters the central hole of the filling short section 4 through the filling hole 22 of the filling short section 4 and then returns to the ground through the central pipe 1, the intermediate joint 14, the insertion pipe 16 and the pipe, and therefore reverse circulation sand washing operation is achieved.
The filling tool is novel in structure and simple to operate, and filling and sand washing actions can be carried out only by lifting and lowering the pipe column. And can also realize the setting of the isolation packer, when setting the isolation packer in the current period, the filling sliding sleeve of the packer is in a closed state, so that high-pressure liquid flows upwards from the filling hole 22 to the hydraulic setting hole of the isolation packer, and the setting of the isolation packer can be realized.
The insert pipe 16 is arranged in the interlayer pipe 13 of the filling tool in a sliding mode, when the upper end pipe column is connected with the filling tool, the upper end pipe column can be directly inserted through the insert pipe 16, the effect of inserting sealing is achieved, and the pipe column is simply and quickly sealed. During the operation of filling, fill the inside protective tube 24 of nipple joint 4, can effectual reduction instrument by the hidden danger of breaking, improved the life of this instrument, and the protective tube through-hole on the protective tube 24 and the specific 45 degrees angle designs of slope of liquid flow direction are favorable to the liquid flow to pass through the protective tube through-hole along the pipe wall, reduce the impulsive force that the sudden wide-angle turning of liquid flow caused the part. The unique bypass flow channel is designed to provide an independent channel for filling and reverse circulation, so that the filling safety is ensured; the packer has the characteristics of realizing filling, reverse circulation, setting of an isolation packer and the like.
Claims (9)
1. A filling tool with a reverse circulation function comprises a central pipe (1), an upper joint (2), a long outer pipe (3), a filling short section (4), a three-way short section (5) and a lower core shaft (6); the method is characterized in that: one end of the filling short section (4) is provided with a long sealing mandrel through a double short section (7); the end of the long sealing mandrel is provided with an upper joint (2) through a long outer tube (3); install intermediate layer pipe (13) in long outer tube (3), center tube (1) is installed through intermediate head (14) in intermediate layer pipe (13) end, and double seal ring dabber (18) are installed through dabber (6) and short sealed dabber (17) down to the other end of filling nipple joint (4), and reducing seal dabber (19) are installed through tee bend nipple joint (5) to double seal ring dabber (18) one end, and sealed dabber F (20) are installed to reducing seal dabber (19) end.
2. A filling tool with reverse circulation function according to claim 1, wherein: the double-meter short section (7) is in threaded connection with the filling short section (4); the long sealing mandrel is composed of a sealing mandrel A (8), a sealing mandrel B (9), a sealing mandrel C (10), a sealing mandrel D (11) and a sealing mandrel E (12), and the sealing mandrel A (8), the sealing mandrel B (9), the sealing mandrel C (10), the sealing mandrel D (11) and the sealing mandrel E (12) are in threaded connection with each other; the sealing mandrel A8) is in threaded connection with the double-mu short joint (7); the sealing mandrel E (12) is in threaded connection with the long outer pipe (3); the upper joint (2) is in threaded connection with the long outer pipe (3).
3. A filling tool with reverse circulation function according to claim 2, wherein: and the double-diameter short section (7), the long outer tube (3), the sealing mandrel A (8), the sealing mandrel B (9), the sealing mandrel C (10), the sealing mandrel D (11) and the sealing mandrel E (12) are respectively provided with an external sealing assembly (21).
4. A filling tool with reverse circulation function according to claim 1, wherein: the middle joint (14) is respectively in threaded connection with the interlayer pipe (13) and the central pipe (1), and one end of the central pipe (1) is in threaded connection with the filling nipple (4); an insertion pipe (16) is arranged in the interlayer pipe (13) in a sliding mode, one end of the insertion pipe extends into the upper joint (2), and a sealing ring is arranged between the interlayer pipe (13) and the insertion pipe (16).
5. A filling tool with reverse circulation function according to claim 4, wherein: the filling short section (4) is in threaded connection with a lower mandrel (6), the lower mandrel (6), a short sealing mandrel (17), a double sealing ring mandrel (18), a three-way short section (5), a reducing sealing mandrel (19) and a sealing mandrel F (20) are in threaded connection in sequence, and outer sealing assemblies (21) are respectively arranged on the lower mandrel (6), the short sealing mandrel (17), the double sealing ring mandrel (18), the three-way short section (5), the reducing sealing mandrel (19) and the sealing mandrel F (20); the outer sealing assembly (21) is composed of an assembling ring and sealing rings uniformly distributed on the circumference of the assembling ring.
6. A filling tool with reverse circulation function according to claim 5, wherein: the filling short section (4) is a reducing body, and filling holes (22) are uniformly distributed on the circumference of the middle part of the filling short section (4) in the radial direction; the filling hole is communicated with the central hole; a plug (26) is installed in the internal thread of the filling short section (4) at one side of the filling hole (22), and the plug (26) is a reducing cup-shaped body; one end of the plug (26) extends into the lower core shaft (6); a pipe wall of the filling nipple (4) is symmetrically and axially provided with a nipple bypass hole (23); a protective pipe (24) is arranged in a center hole of the filling short section (4) corresponding to the filling hole (22), and a protective pipe through hole is formed in the circumference of the protective pipe (24) corresponding to the filling hole (22); the protective pipe (24) is connected with the plug (26) and the filling short section (4) through a set screw (25).
7. A filling tool with reverse circulation function according to claim 5, wherein: a ball valve body (29) is arranged in the central holes of the three-way nipple (5) and the double-sealing ring mandrel (18) through a valve seat (28), and a spring (31) is arranged on the ball valve body (29) through a spring seat (30); one end of the spring seat (30) is in threaded connection with the valve seat (28), and the other end of the spring seat (30) is connected with the double-sealing ring mandrel (18); the circumference of the ball valve body (29) is provided with a liquid flow hole (32).
8. A filling tool with reverse circulation function according to claim 7, wherein: the circumference of the three-way nipple (5) is symmetrically provided with nipple through holes (33), and the nipple through holes (33) are communicated with a central hole of the three-way nipple (5); and the pipe walls of the three-way pipe nipples (5) on the two sides of the central hole are axially provided with three-way pipe nipple bypass holes (34).
9. A filling tool with reverse circulation function according to claim 8, wherein: one end of a center hole of the three-way nipple (5) is in a plugging shape.
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| CN202010618570.2A CN111706304B (en) | 2020-07-01 | 2020-07-01 | Filling tool with reverse circulation function |
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| CN202010618570.2A CN111706304B (en) | 2020-07-01 | 2020-07-01 | Filling tool with reverse circulation function |
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| CN111706304B CN111706304B (en) | 2022-08-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111927379A (en) * | 2020-10-14 | 2020-11-13 | 东营市瑞丰石油技术发展有限责任公司 | Bypass packer |
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| CN111706304B (en) | 2022-08-30 |
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