CN109162680B - Out-of-pipe segmented gravel pack completion string and completion method - Google Patents
Out-of-pipe segmented gravel pack completion string and completion method Download PDFInfo
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- CN109162680B CN109162680B CN201811286567.4A CN201811286567A CN109162680B CN 109162680 B CN109162680 B CN 109162680B CN 201811286567 A CN201811286567 A CN 201811286567A CN 109162680 B CN109162680 B CN 109162680B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 113
- 210000002445 nipple Anatomy 0.000 claims abstract description 85
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 230000002265 prevention Effects 0.000 claims abstract description 23
- 238000011010 flushing procedure Methods 0.000 claims abstract description 13
- 230000000712 assembly Effects 0.000 claims abstract description 5
- 238000000429 assembly Methods 0.000 claims abstract description 5
- 238000012856 packing Methods 0.000 claims description 35
- 238000007790 scraping Methods 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000003208 petroleum Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000005429 filling process Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- 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
- 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
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Pipe Accessories (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a completion pipe string with a sectionalized gravel pack outside a pipe and a completion method, which are used in the field of sand prevention completion in the petroleum industry. The well completion pipe column comprises a sand prevention outer pipe and a filling pipe column, wherein the sand prevention outer pipe comprises a fixed sealing outer pipe and more than two sections of sand prevention pipe assemblies, and each section of sand prevention pipe assembly comprises an outer pipe packer, an upper sealing cylinder, a filling sliding sleeve, a lower sealing cylinder, a positioning short section and a sand prevention pipe; the filling pipe column is a double-layer pipe column, the circulating outer pipe comprises an opening key, an upper sealing nipple, a filling nipple, a reverse circulating nipple, a lower sealing nipple, a positioner, a closing key and a bottom one-way valve, and the circulating outer pipe is sleeved with a sealing assembly; the completion method comprises the following steps: the method comprises the steps of preparing a pipe column, installing a sand prevention outer pipe, putting a filling pipe column in, opening the filling sliding sleeve, positioning the filling pipe column, sand prevention filling, back flushing a well and closing the filling sliding sleeve. The invention reasonably sets the position and the structure of the tool, simplifies the operation of the pipe column, realizes the instant well flushing, effectively prevents sand from clamping the pipe column and has reliable filling sliding sleeve structure.
Description
Technical Field
The invention relates to the technical field of sand prevention completion in petroleum industry, in particular to a completion pipe string with a segmented gravel pack outside a pipe and a completion method.
Background
In the petroleum development process, along with the progress of the well completion technology, in the loose sandstone reservoir exploitation field, the sand control technology develops from in-pipe sand control to out-pipe sand control well completion, and develops from total sand control of a whole well section to sand control of a layered section, so that the sand control technology has higher difficulty. The sand prevention of the layering section outside the sleeve has the advantages of simple process operation and high reliability.
The Chinese patent, patent application No. 201210534469.4, the invention name of the method for packing sand by one time multi-layer gravel, and the Chinese patent, application No. CN201510134953.1, the invention name of the method for packing sand by one time multi-layer gravel for thermal recovery well and the sand control method thereof disclose layered sand control technologies, the two technologies have complex operation in the process of installing sand control pipe columns and controlling sand, the used packing tools have low reliability, in particular, the adopted packing sliding sleeve is in an open state before sand control packing, when the packer is not sealed well, the packing sand or stratum sand can enter the sand control pipe column from the packing sliding sleeve packing channel, and the inner pipe column is easy to be packed by sand cards, so the technology is only suitable for the inner pipe column for the inner layer sand control of the casing and is not suitable for the sand control of the outer layered section gravel packing.
The invention discloses a casing gravel packing sand control technology, which has two problems in terms of the technical process, namely unreasonable opening and closing operation of a packing sliding sleeve. The service pipe column is lowered to open the filling sliding sleeve, and the service pipe column is lifted to close the filling sliding sleeve. The layered filling is generally to fill the lowest layer first and to fill the layers successively upwards. When the technique is put into a service pipe column, the filling sliding sleeve which is passed by the switching tool is firstly opened and then lifted up to be closed, and each sliding sleeve is similar, so that a plurality of unnecessary operations are increased, and the filling sliding sleeve is easy to damage. And secondly, the pipe column is easy to clamp by sand. The technology needs to lift the pipe column to position after gravel filling is finished and then back flushing the well, and once sand blockage occurs in the filling process, the well cannot be flushed in time, so that the pipe column is blocked by the sand, and the operation is failed.
Disclosure of Invention
The sand control filling operation is simple, the steps of lifting and placing the pipe column are few, the filling tool structure is reliable, the filling operation is not easy to sand and clamp, and the success rate is high.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the outside-pipe subsection gravel pack well completion pipe column comprises a sand prevention outer pipe and a packing pipe column, and the packing pipe column is arranged in the sand prevention outer pipe; the downhole tools are connected together by a casing or tubing;
the sand control outer tube is sequentially connected with the fixed sealing outer tube and more than two sections of sand control tube assemblies from top to bottom, and each section of sand control tube assembly comprises an outer tube packer, an upper sealing tube, a filling sliding sleeve, a lower sealing tube, a positioning short section and a sand control tube which are sequentially connected from top to bottom;
the filling pipe column is a double-layer pipe column, a circulating outer pipe and a filling inner pipe are sleeved with each other, the circulating outer pipe is sequentially connected with an opening key, an upper sealing nipple, the filling nipple, a reverse circulating nipple, a lower sealing nipple, a positioner, a key closing and a bottom one-way valve from top to bottom, and a sealing assembly is sleeved outside the circulating outer pipe above the opening key; the filling inner pipe is connected with the filling nipple, the filling nipple is of a bridge type flow channel structure, a filling port is transversely arranged in the central hole of the filling nipple and is communicated with the outside of the filling pipe column, the filling inner pipe is communicated with the filling port, and the side hole of the filling nipple is communicated with the annulus of the filling pipe column; the reverse circulation nipple is of a bridge type flow channel structure, a middle one-way valve is arranged at the upper end of a central hole of the reverse circulation nipple and is communicated with the annulus of the filling pipe column, the central hole of the reverse circulation nipple is communicated with the outside of the filling pipe column through a backwashing port, and a side hole of the reverse circulation nipple is communicated with the annulus of the filling pipe column.
In a preferred embodiment, the filling sliding sleeve comprises a shell and an inner sleeve, wherein the inner sleeve comprises a main inner sleeve and a positioning sleeve sleeved with the main inner sleeve, positioning protrusions are arranged on the periphery of the positioning sleeve, and positioning grooves matched with the positioning protrusions are formed in the inner wall of the shell.
In a preferred embodiment, the filling sliding sleeve comprises an outer shell and an inner sleeve; the inner sleeve is of a cylindrical double-layer structure, and a safety pin is arranged between the two layers; the inner layer of the cylindrical double-layer structure is a safety inner sleeve, and an inner opening groove and an inner closing groove are respectively arranged at the upper end and the lower end of an inner hole of the safety inner sleeve; the outer layer of the cylindrical double-layer structure comprises a sealing inner sleeve and a positioning sleeve connected with the sealing inner sleeve, positioning bulges are arranged on the periphery of the positioning sleeve, positioning grooves matched with the positioning bulges are arranged on the inner wall of the shell, and the sealing sleeve is sleeved outside the sealing inner sleeve.
In a preferred embodiment, a locking mechanism is arranged between two layers of the cylindrical double-layer structure of the inner sleeve. The locking mechanism is arranged between the safety inner sleeve and the sealing inner sleeve and comprises locking threads arranged on the periphery of the safety inner sleeve and a locking ring sleeved on the locking threads; the sealing inner sleeve comprises a short inner sleeve and a pressing cap connected with the short inner sleeve, an annular groove is formed in the inner wall of the joint of the short inner sleeve and the pressing cap, and a locking ring is arranged in the annular groove.
In the preferred embodiment, a sand scraping cylinder is arranged in the annulus between the outer shell and the main inner sleeve, and the sand scraping cylinder is fixedly arranged with the main inner sleeve. The annular space between the outer shell and the safety inner sleeve is provided with a sand scraping cylinder which is fixedly arranged with the safety inner sleeve.
A completion method for the outside-pipe subsection gravel pack completion string comprises the steps of,
a. preparing a tubular column: the ground is connected with the sand-preventing outer pipe and the filling pipe column, so that the length between the upper sealing cylinder and the lower sealing cylinder is equal to the length between the upper sealing nipple and the lower sealing nipple; the length between the lower sealing cylinder and the positioning nipple is equal to the length between the lower sealing nipple and the positioner;
b. installing a sand prevention outer tube: the sand control outer pipe is put down to the underground oil layer to finish the setting of the outer packer;
c. and (3) lowering a filling pipe column: the filling pipe column is downwards arranged at the position of the sand control pipe assembly at the lowest section from the sand control outer pipe;
d. opening the filling sliding sleeve, namely enabling the opening key to be positioned below the filling sliding sleeve; lifting the filling pipe column to enable the key to open the filling sliding sleeve and enable the positioner to be positioned above the positioning nipple;
e. positioning a filling pipe column: lowering the filling pipe column to enable the positioner to sit on the positioning nipple to finish positioning;
f. sand prevention filling: sequentially pumping a pad fluid, a sand-carrying fluid and a displacement fluid from the filling pipe column;
g. and (3) back flushing: pumping well flushing liquid into an annulus between the filling pipe column and the sand prevention outer pipe, and making the well flushing liquid flow back out of the filling pipe column;
h. closing the filling sliding sleeve: lifting the filling pipe column to enable the closing key to reach above the filling sliding sleeve, and then lowering the filling pipe column to enable the closing key to pass through the filling sliding sleeve so as to close the filling sliding sleeve;
i. filling upwards: lifting the filling pipe column to the sand control pipe assembly of the previous section, and repeating the steps d-h until all well sections are filled.
The invention has the technical advantages that:
1. the filling sliding sleeve switch is simple and convenient to operate. The filling pipe column of the invention is reasonably provided with the positions of the opening and closing tools of the filling sliding sleeve, namely the opening and closing tools of the filling sliding sleeve, thereby realizing the functions of lifting, opening and lowering the filling sliding sleeve, preventing the filling sliding sleeve from being opened ineffectively in the first filling pipe column lowering process, and simplifying the operation of lifting and lowering the filling pipe column.
2. And (5) preventing sand blocking of the pipe column. The filling pipe column is provided with a two-stage bridge type flow passage structure in series connection, the upper part of the central pipe of the lower-stage bridge type flow passage is provided with the one-way valve, and the filling pipe column is matched with the sand prevention outer pipe, so that the instant well flushing in the filling process or after the filling is completed is realized, and the sand blocking of the filling pipe column is effectively prevented.
3. The filling sliding sleeve structure is reliable. (1) The positioning protrusion and the positioning groove prevent the filling sliding sleeve from being accidentally opened or closed in the action process of the pipe column. (2) The treatment measures of the sand clamp inner sleeve are fully considered, the inner sleeve is designed into a double-layer structure, and once the sand clamp seals the inner sleeve, the safety inner sleeve can normally close the sliding sleeve to prevent gravel or stratum sand from entering the pipe; the locking mechanism is further arranged to prevent misoperation of the safety inner sleeve when the filling pipe column is pulled down. (3) The sand scraping cylinder can effectively remove the gravels deposited on the inner wall of the filling sliding sleeve and prevent the sand from clamping the inner sleeve.
Drawings
The invention, together with a further understanding of the many of its attendant advantages, will be best understood by reference to the following detailed description, when considered in conjunction with the accompanying drawings, which are included to provide a further understanding of the invention, and the accompanying drawings, illustrate and do not constitute a limitation on the invention, and wherein:
fig. 1 is a schematic view of a packing string.
FIG. 2 is a schematic structural view of a sand control outer tube.
FIG. 3 is a schematic view of a packing string installed in a sand control outer tube to a packed condition.
FIG. 4 is a schematic diagram of the flow of a filling process stream.
FIG. 5 is a schematic flow diagram of a backwash well stream.
Fig. 6 is a schematic view of the construction of a first preferred embodiment of the filling sleeve.
Fig. 7 is a schematic structural view of a second preferred embodiment of the filling sleeve.
Fig. 8 is a schematic structural view of a third preferred embodiment of the filling sleeve.
Fig. 9 is a schematic structural view of a fourth preferred embodiment of the filling sleeve.
Fig. 10 is a schematic structural view of the sand scraping cylinder.
Fig. 11 is a schematic diagram of a bridge flow channel structure.
Fig. 12 is a cross-sectional view of A-A of fig. 11.
Detailed Description
In the description of the present specification, the above-mentioned upper and lower positional relationships are the same as those shown in the drawings, and are also the positional relationships between the members when the tool of the present invention is applied to a vertical well.
As shown in fig. 1, the packing string 100 is a double-layer string, a circulating outer tube 110 is sleeved with a packing inner tube 101, the circulating outer tube 110 is sequentially connected with an open key 107, an upper sealing nipple 108, a packing nipple 109, a reverse circulating nipple 112, a lower sealing nipple 113, a positioner 114, a closing key 115 and a bottom one-way valve 116 from top to bottom, and a sealing assembly 106 is sleeved outside the circulating outer tube above the open key 107; the filling inner pipe 101 is connected with the filling nipple 109, the filling nipple 109 is of a bridge type flow channel structure, a filling port 102 is transversely arranged in the central hole of the filling nipple and is communicated with the outside of the filling pipe column 100, the filling inner pipe 101 is communicated with the filling port 102, and the side hole of the filling nipple is communicated with an annulus 117 of the filling pipe column 100; the reverse circulation nipple 112 is of a bridge flow channel structure, a middle one-way valve 111 is arranged at the upper end of a central hole of the reverse circulation nipple and is communicated with an annulus 117 of the filling pipe column 100, the central hole of the reverse circulation nipple is communicated with the outside of the filling pipe column 100 through a backwashing port 103, and a side hole of the reverse circulation nipple is communicated with the annulus 117 of the filling pipe column 100. The tools on the packing string are connected by tubing 104.
The seal assembly 106 includes a sliding inner seal 105, a fixed seal 121, a fixed protrusion 122, and a seal tube 123. The sliding inner seal 105 is fixedly disposed in the sealing tube 123, and the fixed seal 121 and the fixed protrusion 122 are fixedly installed to be sleeved outside the sealing tube 123. The outer circulation tube above the key 107 is a smooth surface that seals in cooperation with the sliding inner seal 105, and the length of the smooth surface of the outer circulation tube should be such that the sliding inner seal 105 will always be in a smooth surface section throughout the packing operation when the packing string is being pulled up and down.
The bridge flow channel structure is a prior art and includes a side aperture 1101, a central aperture 1102 and a bridge aperture 1103 as shown in fig. 11 and 12. For the purposes of the present invention, the bridge orifice of filling nipple 109 is filling port 102 and the bridge orifice of reverse circulation nipple 112 is backwash port 103.
The flow direction of the bottom one-way valve 116 is from bottom to top, and the flow direction of the middle one-way valve 111 is from top to bottom, to meet the requirements of the filling and backwashing processes.
Referring to fig. 2, a sand control outer tube 200 is sequentially connected with a fixed sealing outer tube 202 and more than two sand control tube assemblies from top to bottom, and each sand control tube assembly comprises an outer tube packer 203, an upper sealing tube 204, a filling sliding sleeve 205, a lower sealing tube 206, a positioning nipple 207 and a sand control tube 208 which are sequentially connected from top to bottom. The stationary seal outer cylinder 202 includes a smooth-surfaced light pipe and a stationary groove 209 provided in its lower portion. The downhole tools are connected by a casing 201.
The out-of-pipe packer 203 is a known technique.
The retainer 114 and the retainer nipple associated therewith, the on-key 107, the off-key 115, and the internal groove structure of the filling sleeve 205 associated with the on-off key are all known in the art, and are described in chinese patent application No. 201210534469.4, entitled "one-time multi-layer gravel packing method".
Referring to FIG. 3, an out-of-pipe staged gravel pack completion string, comprising an outer sand control tube 200 and a packing string 100, the packing string being installed within the outer sand control tube; the downhole tools are connected together by casing or tubing. When the lower end of the filling pipe column is lowered to the bottom of the sand control outer pipe, the sealing assembly 106 enters the fixed sealing outer pipe 202, the fixed protrusion 122 is clamped in the fixed groove 209 and is fixed, so that the sealing assembly 106 is always clamped in the fixed sealing outer pipe 202 in the whole filling operation process, and the sliding inner seal 105 is in sliding sealing with the circulating outer pipe 110.
The positioner 114 has a circular track structure therein, which allows the positioner 114 to seat into the positioning nipple 207 by lifting up and running down the string.
When the positioner is seated on the positioning nipple, the upper sealing nipple 108 and the lower sealing nipple 113 seal the upper sealing cylinder 204 and the lower sealing cylinder 206, respectively, and the filling port 102 is opposite to the filling sliding sleeve 205.
Referring to fig. 6, the filling slide 205 includes a housing 601 and an inner sleeve 603, a circulation hole 605 is provided on the housing 601, and a sealing ring 604 is provided between the housing and the inner sleeve at both sides of the circulation hole. An inner opening groove 602 and an inner closing groove 606 are respectively arranged at the upper end and the lower end of the inner hole of the inner sleeve 603. Open inner slots 602 and Guan Nacao are mated with open key 107 and close key 115, respectively, and the slot configuration of open inner slots 602 and close inner slots 606 is known in the art. After gravel is filled, the gravel may remain on the inner wall of the outer shell, the inner sleeve may be blocked, the inner sleeve is prevented from being blocked, and a sand scraping cylinder 607 can be additionally arranged between the outer shell and the inner sleeve. In order to improve the scraping effect, referring to fig. 10, a scraping sheet 1001 is provided on the outer circumference of the scraping cylinder 607, and may be conical or bowl-shaped. The material of the sand scraping cylinder can be rubber or polytetrafluoroethylene and other elastic materials.
In order to prevent the inner sleeve 603 from unexpected opening or displacement caused by lifting and lowering the filling pipe column, a positioning mechanism is added to the inner sleeve. Referring to fig. 7, the positioning mechanism is composed of a positioning protrusion and a positioning groove. A positioning protrusion 703 is provided on the outer periphery of the positioning sleeve 701, and a positioning groove 702 matching with the positioning protrusion 703 is provided on the inner wall of the housing 601. The positioning grooves 702 are respectively arranged at the upper and lower sides and respectively correspond to the open state and the closed state of the inner sleeve. The main inner sleeve 704 and the positioning sleeve 701 sleeved with the main inner sleeve form the inner sleeve 603 together. Also, a sand scraping cylinder 607 may be added between the main inner housing 704 and the outer housing 601.
Referring to fig. 8, in order to further solve the problem of the sand card inner sleeve, the inner sleeve is designed into a double-layer cylinder which is mutually sleeved, and a safety pin 803 is arranged between the two layers in the radial direction; the inner layer of the cylindrical double-layer structure is a safety inner sleeve 801, and an open inner groove 602 and a close inner groove 606 are respectively arranged at the upper end and the lower end of an inner hole of the safety inner sleeve 801; the outer layer of the cylindrical double-layer structure comprises a sealing inner sleeve 802 and a positioning sleeve 701 connected with the sealing inner sleeve 802, a positioning protrusion 703 is arranged on the periphery of the positioning sleeve 701, a positioning groove 702 matched with the positioning protrusion 703 is arranged on the inner wall of the outer shell 601, and a sealing ring 604 is sleeved outside the sealing inner sleeve 802. Similarly, a sand scraping cylinder 607 can be additionally arranged between the safety inner sleeve 801 and the outer shell 601, and the sand scraping cylinder 607 is fixedly sleeved with the safety inner sleeve 801.
After the opened filling sliding sleeve finishes the filling operation, when the closing inner sleeve encounters a clamp, when the lower pushing force exceeds the shearing resistance of the safety pin 803, the safety pin 803 is sheared off, and the safety inner sleeve and the sand scraping cylinder move downwards together, so that the filling sliding sleeve is closed.
Further, referring to fig. 9, in order to prevent the safety inner sleeve 801 from being accidentally displaced by lifting up and down the packing string, a locking mechanism is provided between two layers of the cylindrical double-layer structure of the inner sleeve. The locking mechanism is arranged between the safety inner sleeve 801 and the sealing inner sleeve 802, and comprises locking threads 901 arranged on the periphery of the safety inner sleeve 801 and locking rings 903 sleeved on the locking threads, wherein the locking mechanism consisting of the locking threads and the locking rings is a known technology and is commonly used in underground hydraulic packers of oil fields; the sealing inner sleeve 802 comprises a short inner sleeve 902 and a press cap 904 connected with the short inner sleeve, an annular groove is arranged on the inner wall of the joint of the short inner sleeve 902 and the press cap 904, and a locking ring 903 is arranged in the annular groove. Of course, an annular groove may also be provided between the spacer 701 and the short inner sleeve 902, with the locking ring disposed therein. Similarly, a sand scraping cylinder 607 can be additionally arranged between the safety inner sleeve 801 and the outer shell 601, and the sand scraping cylinder 607 is fixedly sleeved with the safety inner sleeve 801.
The invention relates to a completion method of a completion string with outside-pipe subsection gravel pack, which comprises the following steps,
a. preparing a tubular column: the sand control outer pipe 200 and the packing string 100 are coupled to the ground so that the length between the upper seal barrel 204 and the lower seal barrel 206 is equal to the length between the upper seal nipple 108 and the lower seal nipple 113; the length between the lower seal cartridge 206 and the locating nipple 207 is equal to the length between the lower seal nipple 113 and the locator 114;
b. installing a sand prevention outer tube: the sand control outer pipe 200 is lowered to the underground oil layer to finish setting of the outer packer 203;
c. and (3) lowering a filling pipe column: the packing string 100 is lowered from within the sand control outer tube 200 to the lowermost section of sand control tube assembly;
d. opening the filling slide sleeve, namely enabling the key 107 to be positioned below the filling slide sleeve 205; lifting the packing string to open the packing sleeve 205 with the key 107 and to locate the retainer 114 above the locating nipple 207;
e. positioning a filling pipe column: lowering the packing string to seat the positioner 114 on the positioning nipple 207 to complete positioning;
f. sand prevention filling: sequentially pumping a pad fluid, a sand-carrying fluid and a displacement fluid from the filling pipe column;
g. and (3) back flushing: pumping well flushing liquid into an annulus between the filling pipe column and the sand prevention outer pipe, and making the well flushing liquid flow back out of the filling pipe column;
h. closing the filling sliding sleeve: lifting the filling string to enable the closing key 115 to be above the filling sliding sleeve 205, and then lowering the filling string to enable the closing key to pass through the filling sliding sleeve so as to close the filling sliding sleeve;
i. filling upwards: lifting the filling pipe column to the sand control pipe assembly of the previous section, and repeating the steps d-h until all well sections are filled.
The above "the length between the upper seal cartridge 204 and the lower seal cartridge 206 is made equal to the length between the upper seal nipple 108 and the lower seal nipple 113; the length between the lower sealing barrel 206 and the positioning nipple 207 is equal to the length between the lower sealing nipple 113 and the positioner 114, which means that the length of the pipe string and the distance between tools can ensure that the upper sealing nipple and the lower sealing nipple are respectively positioned in the upper sealing barrel and the lower sealing nipple in the filling operation process.
It will be apparent that many modifications and variations are possible within the scope of the invention, as will be apparent to those skilled in the art based upon the teachings herein.
Claims (8)
1. The outside-pipe subsection gravel pack completion pipe column comprises a sand control outer pipe (200) and a packing pipe column (100), wherein the packing pipe column is installed in the sand control outer pipe; the underground tools are connected together through a casing pipe or an oil pipe, and the underground tools are characterized in that a sand control outer pipe is sequentially connected with a fixed sealing outer pipe (202) and more than two sections of sand control pipe assemblies from top to bottom, and each section of sand control pipe assembly comprises an outer pipe packer (203), an upper sealing pipe (204), a filling sliding sleeve (205), a lower sealing pipe (206), a positioning short section (207) and a sand control pipe (208) which are sequentially connected from top to bottom; the filling pipe column is a double-layer pipe column, a circulating outer pipe (110) is sleeved with a filling inner pipe (101), the circulating outer pipe (110) is sequentially connected with an open key (107), an upper sealing nipple (108), a filling nipple (109), a reverse circulation nipple (112), a lower sealing nipple (113), a positioner (114), a key closing (115) and a bottom one-way valve (116) from top to bottom, and a sealing assembly (106) is sleeved outside the circulating outer pipe (110) above the open key (107); the filling inner pipe (101) is connected with the filling nipple (109), the filling nipple (109) is of a bridge type flow passage structure, a filling port (102) is transversely arranged in the central hole of the filling nipple and is communicated with the outside of the filling pipe column (100), the filling inner pipe (101) is communicated with the filling port (102), and the side hole of the filling nipple is communicated with an annulus (117) of the filling pipe column (100); the reverse circulation nipple (112) is of a bridge type flow channel structure, a middle one-way valve (111) is arranged at the upper end of a central hole of the reverse circulation nipple and is communicated with an annulus (117) of the filling pipe column (100), the central hole of the reverse circulation nipple is communicated with the outside of the filling pipe column (100) through a backwashing port (103), and a side hole of the reverse circulation nipple is communicated with the annulus (117) of the filling pipe column (100); the filling sliding sleeve (205) comprises an outer shell (601) and an inner sleeve; the inner sleeve is of a cylindrical double-layer structure, and a safety pin (803) is arranged between the two layers; the inner layer of the cylindrical double-layer structure is a safety inner sleeve (801), and an inner opening groove (602) and an inner closing groove (606) are respectively arranged at the upper end and the lower end of an inner hole of the safety inner sleeve (801); the outer layer of the cylindrical double-layer structure comprises a sealing inner sleeve (802) and a positioning sleeve (701) connected with the sealing inner sleeve, a positioning protrusion (703) is arranged on the periphery of the positioning sleeve (701), a positioning groove (702) matched with the positioning protrusion (703) is arranged on the inner wall of the outer shell (601), and a sealing ring (604) is sleeved outside the sealing inner sleeve (802).
2. The out-of-pipe staged gravel pack completion string of claim 1 wherein a locking mechanism is disposed between two layers of the inner liner tubular bilayer structure.
3. The out-of-pipe staged gravel pack completion string of claim 2, wherein the locking mechanism is disposed between the safety liner (801) and the sealing liner (802), the locking mechanism comprising locking threads (901) disposed on the outer circumference of the safety liner (801) and a locking ring (903) disposed over the locking threads; the sealing inner sleeve (802) comprises a short inner sleeve (902) and a pressing cap (904) connected with the short inner sleeve, an annular groove is formed in the inner wall of the joint of the short inner sleeve (902) and the pressing cap (904), and a locking ring (903) is arranged in the annular groove.
4. A pipe-out segment gravel pack completion string according to any of claims 1-3, wherein a sand scraping cylinder (607) is arranged in the annulus between the outer casing (601) and the safety inner sleeve (801), the sand scraping cylinder being fixedly mounted with the safety inner sleeve (801).
5. The out-of-pipe staged gravel pack completion string of claim 4, wherein the wiper blade (1001) is provided on the periphery of the wiper cylinder (607).
6. The completion method applied to the out-of-pipe staged gravel pack completion string of claim 1 comprising the steps of a: the sand-preventing outer pipe (200) and the filling pipe column (100) are matched on the ground, so that the length between the upper sealing cylinder (204) and the lower sealing cylinder (206) is equal to the length between the upper sealing nipple (108) and the lower sealing nipple (113); the length between the lower sealing barrel (206) and the positioning nipple (207) is equal to the length between the lower sealing nipple (113) and the positioner (114); b. installing a sand prevention outer tube: the sand prevention outer pipe (200) is lowered to the underground oil layer to finish setting of the outer pipe packer (203); c. and (3) lowering a filling pipe column: the filling pipe column (100) is downwards arranged at the position of the sand control pipe assembly at the lowest section from the sand control outer pipe (200); d. opening the filling sliding sleeve, namely enabling the opening key (107) to be positioned below the filling sliding sleeve (205); lifting the filling pipe column to enable the key (107) to open the filling sliding sleeve (205) and enable the positioner (114) to be positioned above the positioning nipple (207); e. positioning a filling pipe column: lowering the filling pipe column to enable the positioner (114) to sit on the positioning pup joint (207) to finish positioning; f. sand prevention filling: sequentially pumping a pad fluid, a sand-carrying fluid and a displacement fluid from the filling pipe column; g. and (3) back flushing: pumping well flushing liquid into an annulus between the filling pipe column and the sand prevention outer pipe, and making the well flushing liquid flow back out of the filling pipe column; h. closing the filling sliding sleeve: lifting the filling pipe column to enable the closing key (115) to reach above the filling sliding sleeve (205), and then lowering the filling pipe column to enable the closing key to pass through the filling sliding sleeve so as to close the filling sliding sleeve; i. filling upwards: lifting the filling pipe column to the sand control pipe assembly of the previous section, and repeating the steps d-h until all well sections are filled.
7. The method of completing an out-of-pipe staged gravel pack completion string of claim 6, wherein the out-of-pipe staged gravel pack completion string is used, comprising an outer sand control tube (200) and a packing string (100), the packing string being installed within the outer sand control tube; the downhole tools are connected together by a casing or tubing; the sand control outer tube is sequentially connected with a fixed sealing outer tube (202) and more than two sections of sand control tube assemblies from top to bottom, and each section of sand control tube assembly comprises an outer tube packer (203), an upper sealing tube (204), a filling sliding sleeve (205), a lower sealing tube (206), a positioning nipple (207) and a sand control tube (208) which are sequentially connected from top to bottom; the filling pipe column is a double-layer pipe column, a circulating outer pipe (110) is sleeved with a filling inner pipe (101), the circulating outer pipe (110) is sequentially connected with an open key (107), an upper sealing nipple (108), a filling nipple (109), a reverse circulation nipple (112), a lower sealing nipple (113), a positioner (114), a key closing (115) and a bottom one-way valve (116) from top to bottom, and a sealing assembly (106) is sleeved outside the circulating outer pipe above the open key (107); the filling inner pipe (101) is connected with the filling nipple (109), the filling nipple (109) is of a bridge type flow passage structure, a filling port (102) is transversely arranged in the central hole of the filling nipple and is communicated with the outside of the filling pipe column (100), the filling inner pipe (101) is communicated with the filling port (102), and the side hole of the filling nipple is communicated with an annulus (117) of the filling pipe column (100); the reverse circulation nipple (112) is of a bridge type flow channel structure, a middle one-way valve (111) is arranged at the upper end of a central hole of the reverse circulation nipple and is communicated with an annulus (117) of the filling pipe column (100), the central hole of the reverse circulation nipple is communicated with the outside of the filling pipe column (100) through a backwashing port (103), and a side hole of the reverse circulation nipple is communicated with the annulus (117) of the filling pipe column (100).
8. The method of completing a gravel pack completion string according to claim 7, wherein the inner casing using said packing sleeve (205) is a cylindrical double-layered structure with a locking mechanism disposed between the two layers of the cylindrical double-layered structure; a sand scraping cylinder (607) is arranged in an annulus between a shell (601) filled with the sliding sleeve and the safety inner sleeve (801), and the sand scraping cylinder is fixedly arranged with the safety inner sleeve (801).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811286567.4A CN109162680B (en) | 2018-10-31 | 2018-10-31 | Out-of-pipe segmented gravel pack completion string and completion method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811286567.4A CN109162680B (en) | 2018-10-31 | 2018-10-31 | Out-of-pipe segmented gravel pack completion string and completion method |
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| CN109653695B (en) * | 2019-02-19 | 2024-03-08 | 中科金佳（北京）油田技术开发有限公司 | Bearing assembly for tubular column and tubular column |
| CN111706304B (en) * | 2020-07-01 | 2022-08-30 | 杨国 | Filling tool with reverse circulation function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7581440B2 (en) * | 2006-11-21 | 2009-09-01 | Schlumberger Technology Corporation | Apparatus and methods to perform downhole measurements associated with subterranean formation evaluation |
| CN102134982B (en) * | 2011-02-11 | 2013-12-25 | 青岛瑞信石油设备制造有限公司 | Multilayer gravel packing method and tool |
| CN103015952B (en) * | 2012-12-12 | 2015-07-15 | 山东瑞丰石油技术有限责任公司 | Method for packing multiple layers of gravel in one time |
| CN104929577A (en) * | 2015-06-16 | 2015-09-23 | 西安海智机电设备有限公司 | Switch type well cementation sliding sleeve |
| CN206668234U (en) * | 2017-03-22 | 2017-11-24 | 中国石油化工股份有限公司 | A kind of ball-throwing type selective sand control process pipe string |
| CN206737901U (en) * | 2017-05-19 | 2017-12-12 | 中国石油集团川庆钻探工程有限公司 | The all-pass radial sector fracturing sliding bush opened using coiled tubing |
| CN209212216U (en) * | 2018-10-31 | 2019-08-06 | 中国石油化工股份有限公司 | Tube exterior subsection gravel filling completion tubular column |
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