CN110017121B - Primary multilayer gravel packing tool for large-span perforation section - Google Patents
Primary multilayer gravel packing tool for large-span perforation section Download PDFInfo
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- CN110017121B CN110017121B CN201910310247.6A CN201910310247A CN110017121B CN 110017121 B CN110017121 B CN 110017121B CN 201910310247 A CN201910310247 A CN 201910310247A CN 110017121 B CN110017121 B CN 110017121B
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- 238000012856 packing Methods 0.000 title claims abstract description 36
- 239000004576 sand Substances 0.000 claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 claims abstract description 50
- 230000002265 prevention Effects 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 317
- 238000002955 isolation Methods 0.000 claims description 78
- 238000012360 testing method Methods 0.000 claims description 56
- 238000004140 cleaning Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 16
- 210000002445 nipple Anatomy 0.000 claims description 12
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 72
- 239000002356 single layer Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 description 12
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 6
- 235000017491 Bambusa tulda Nutrition 0.000 description 6
- 241001330002 Bambuseae Species 0.000 description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 6
- 239000011425 bamboo Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000008092 positive effect Effects 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
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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
- E21B43/14—Obtaining from a multiple-zone well
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a primary multilayer gravel packing tool for a large-span perforation section, which comprises an outer-layer tubular column longitudinally penetrating the whole perforation section and a service tubular column put into the outer-layer tubular column, wherein the outer-layer tubular column comprises a sand setting packer, an outer-layer tubular column main body part inserted into the upper part of the sand setting packer and a top packer assembly connected with the outer-layer tubular column main body part, which are sequentially arranged from bottom to top; the main body part of the outer-layer pipe column comprises a bottom operation pipe section, a middle operation pipe section and a sand prevention section; the sand control section, the middle operation pipe section and the bottom operation pipe section are respectively provided with a sand control screen pipe corresponding to the corresponding perforation layer and an inner liner pipe thereof, an annular space is formed between the inner liner pipe and the sand control screen pipe, and the inner liner pipe is connected with a production circulating sliding sleeve; the service pipe column mainly adopts a single-layer structure, the invention can be used for the once multi-layer gravel packing fracturing sand prevention operation of the large-span perforation section, and the separate-layer exploitation can be realized without putting in a lower well completion production pipe column.
Description
Technical Field
The invention relates to the technical field of sand control of oil exploitation wells, in particular to a primary multilayer gravel packing tool for a large-span perforation section.
Background
For a loose sandstone production well, in the process of exploitation, produced liquid flows into a shaft, and part of formation sand is carried into the shaft to damage an electric pump and production equipment. In order to prevent sand production of an oil well, an independent screen pipe is generally used for sand control or gravel packing is generally used for sand control at present.
The fracturing operation of a part of production wells is hoped to be carried out on a certain scale while sand control is carried out, the aims of establishing stratum fractures and increasing stratum output are achieved, and the fracturing operation of loose sandstone wells is generally carried out simultaneously with sand control gravel filling operation at present.
In the existing gravel packing sand control or gravel packing fracturing sand control aiming at a cased well, a multi-layer gravel packing mode and a multi-layer gravel packing mode are generally adopted for multi-layer gravel packing. The multi-layer gravel packing process can solve the problem of sand prevention of gravel packing of a multi-layer production interval needing layered mining in one time, and improves the operation efficiency. But the liquid friction resistance is large and the operation of overlong central pipe cannot be finished due to the two-layer pipe structure of the service pipe column. And a production string at the lower part needs to be put in to realize separate production.
Disclosure of Invention
The invention provides a primary multilayer gravel packing tool for a large-span perforation section, which can be used for primary multilayer gravel packing fracturing sand control operation of the large-span perforation section and can realize separate-layer production without running a lower well completion production string.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a large-span perforation section primary multilayer gravel packing tool is provided with an upper perforation layer, zero to multiple middle perforation layers and a bottom perforation layer, and comprises an outer tubular column longitudinally penetrating the whole perforation section and a service tubular column put in the outer tubular column, wherein the outer tubular column comprises a sand setting packer, an outer tubular column main body part inserted into the upper part of the sand setting packer and a top packer assembly connected with the outer tubular column main body part, which are sequentially arranged from bottom to top; the top packer assembly comprises a top packer, an upper core sealing barrel, a filling sliding sleeve, a lower core sealing barrel and a display fixed sealing barrel which are sequentially connected from top to bottom; the main body part of the outer-layer pipe column comprises bottom operation pipe sections corresponding to the bottom perforation layers, middle operation pipe sections corresponding to all the middle perforation layers one to one and sand control sections corresponding to the upper perforation layers; the sand control section, the middle operation pipe section and the bottom operation pipe section are respectively provided with a sand control screen pipe corresponding to the corresponding perforation layer and an inner liner pipe thereof, an annular space is formed between the inner liner pipe and the sand control screen pipe, and the inner liner pipe is connected with a production circulation sliding sleeve; the upper ends of the sand prevention section, the middle operation pipe section and the bottom operation pipe section are connected with a blind pipe; the upper ends of the blind pipes of the middle operation pipe section and the bottom operation pipe section are provided with a display fixed sealing barrel, a lower core sealing barrel, a filling sliding sleeve, an upper core sealing barrel, an isolation packer and a lower seal-testing sealing barrel which are sequentially connected from bottom to top, and the display fixed sealing barrel is connected with the upper end of the blind pipe; an upper seal checking sealing cylinder positioned above the production circulating sliding sleeve is arranged on the inner liner pipe of the middle operation pipe section and the inner liner pipe of the upper operation pipe section; the blind pipe of the sand control section is connected with the display fixing sealing cylinder of the top packer assembly; the lower end of the bottom operation pipe section is provided with an anchoring insertion seal which is inserted and fixed at the upper part of the sand setting packer; the service pipe column is provided with a lower-entering flushing pipe, a filling tool, a load display, a sliding sleeve operation tool, a length-matching flushing pipe and a bottom isolation pipe which are sequentially connected from top to bottom; the bottom of the bottom isolation pipe is provided with a guide shoe, a bottom isolation check valve is arranged inside the bottom isolation pipe, the upper part of the bottom isolation pipe is provided with a bottom isolation circulating hole, a bottom isolation sealing module I and a bottom isolation sealing module II which are arranged on the bottom isolation pipe are arranged below the bottom isolation circulating hole, and the bottom isolation sealing module I is closer to the bottom isolation circulating hole than the bottom isolation sealing module II; the filling tool is provided with a positive circulation short section, a filling bypass short section and a reverse circulation short section which are sequentially connected from top to bottom, the bottom of the reverse circulation short section is provided with a check valve, a reverse circulation hole is formed in the reverse circulation short section, a hydraulic positioner, a sealing module III and a sealing module IV are mounted on the reverse circulation short section, the reverse circulation hole, the sealing module III and the sealing module IV are all located above the hydraulic positioner, and the sealing module III and the sealing module IV are respectively located on the upper side and the lower side of the reverse circulation hole; the filling bypass short section and the positive circulation short section both adopt a double-layer structure and are provided with annular spaces, the annular space of the positive circulation short section is connected with the reverse circulation short section through the annular space of the filling bypass short section, and a bypass filling hole is formed in the filling bypass short section; a sealing module I and a sealing module II are installed on the positive circulation nipple, a circulation hole communicated with the positive circulation nipple in an annular space is formed in the outer wall of the positive circulation nipple, and the circulation hole is located above the sealing module I and the sealing module II; in the process of carrying out sand control operation on a bottom perforation layer, when setting, a sealing module II on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the bottom operation pipe section, a sealing module III on the service pipe column is matched and sealed with an upper core sealing barrel on the bottom operation pipe section, and the filling hole is positioned between the lower seal testing sealing barrel on the bottom operation pipe section and the upper core sealing barrel on the bottom operation pipe section to construct a setting channel of a bottom operation pipe section isolation packer; when the seal is tested, a sealing module II on the service pipe column is matched and sealed with an upper seal testing sealing barrel on the bottom operation pipe section, a sealing module III on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the bottom operation pipe section, and the filling hole is positioned between the upper seal testing sealing barrel on the bottom operation pipe section and the lower seal testing sealing barrel on the bottom operation pipe section to construct a seal testing inlet channel of the bottom operation pipe section isolation packer; when filling and fracturing, the hydraulic positioner is located on a display fixed sealing cylinder on the bottom operation pipe section and is in sealing connection with the display fixed sealing cylinder, a sealing module II on the service pipe column is in matched sealing with an upper core sealing cylinder on the bottom operation pipe section, a sealing module III on the service pipe column is in matched sealing with a lower core sealing cylinder on the bottom operation pipe section, the filling hole is located between the upper core sealing cylinder on the bottom operation pipe section and the lower core sealing cylinder on the bottom operation pipe section, and the reverse circulation hole is located below the lower core sealing cylinder of the bottom operation pipe section to construct a forward circulation channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel on the bottom operation pipe section, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the bottom operation pipe section, and the filling hole and the reverse circulation hole are positioned between the upper core sealing barrel on the bottom operation pipe section and the lower core sealing barrel on the bottom operation pipe section, so that a reverse circulation cleaning channel is constructed; in the process of carrying out sand prevention operation on the middle perforation layer, when setting, a sealing module II on the service pipe column is matched and sealed with a middle seal testing sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is matched and sealed with an upper core sealing barrel on the middle operation pipe section, and the filling hole is positioned between the middle seal testing sealing barrel of the middle operation pipe section and the upper core sealing barrel of the middle operation pipe section to construct a setting channel of an isolation packer of the middle operation pipe section; when the seal is tested, a sealing module II on the service pipe column is matched and sealed with an upper seal testing sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the middle operation pipe section, the filling hole is positioned between the upper seal testing sealing barrel on the middle operation pipe section and the lower seal testing sealing barrel on the middle operation pipe section, a seal testing inlet channel of an isolation packer of the middle operation pipe section is constructed, a bottom isolation sealing module II on the service pipe column is matched and sealed with the lower seal testing sealing barrel adjacent to the lower seal testing sealing barrel under the operation pipe section, and a bottom isolation upward return channel is constructed; when filling and fracturing, the hydraulic positioner is located on a display fixed sealing barrel of the middle operation pipe section and is in sealing connection with the display fixed sealing barrel, a sealing module II on the service pipe column is in matched sealing with an upper core sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is in matched sealing with a lower core sealing barrel on the middle operation pipe section, the filling hole is located between the upper core sealing barrel of the middle operation pipe section and the lower core sealing barrel of the middle operation pipe section, the reverse circulation hole is located below the lower core sealing barrel of the middle operation pipe section to construct a forward circulation channel, and a bottom isolation sealing module I on the service pipe column is in matched sealing with the lower seal testing barrel adjacent to the lower core sealing barrel under the operation pipe section to construct a bottom isolation upward return channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel on the middle operation pipe section, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the middle operation pipe section, and the filling hole and the reverse circulation hole are positioned between the upper core sealing barrel of the middle operation pipe section and the lower core sealing barrel of the middle operation pipe section, so that a reverse circulation cleaning channel is constructed; in the process of carrying out sand control operation on an upper perforation layer, when filling and fracturing, the hydraulic positioner is located on a display fixed sealing barrel of the top packer assembly and is in sealing connection with the display fixed sealing barrel, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the top packer assembly, a sealing module III on the service pipe column is matched and sealed with a lower core sealing barrel on the top packer assembly, the filling hole is positioned between the upper core sealing barrel of the top packer assembly and the lower core sealing barrel of the top packer assembly, the reverse circulation hole is positioned below the lower core sealing barrel of the top packer assembly to construct a forward circulation channel, and a bottom isolation sealing module I on the service pipe column is matched and sealed with a lower seal testing barrel adjacent to the sand control section, constructing a bottom isolated upward return channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel of the top packer assembly, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel of the top packer assembly, and the filling hole and the reverse circulation hole are located between the upper core sealing barrel of the top packer assembly and the lower core sealing barrel of the top packer assembly, so that a reverse circulation cleaning channel is constructed.
The sliding sleeve operation tool comprises a sliding sleeve closing tool, a sliding sleeve opening and closing tool and a sliding sleeve opening tool which are sequentially connected from top to bottom.
One or more production circulation sliding sleeves are arranged on each inner liner pipe.
The lower seal checking cylinder is a left-handed seal cylinder.
The invention has the advantages and positive effects that: compared with the existing one-time multilayer gravel packing tool, the tool can be applied to a multilayer packing cased well with large span and long perforation segment length. The accumulated construction length of the existing primary multi-layer gravel packing tool is limited by liquid friction (the packing process and the sand washing friction by reverse circulation) and cannot implement a large-span perforation section with a length exceeding a certain length (the length of a central pipe of a primary multi-layer packing system of a cased well is generally not more than 350 meters in 9-5/8 'and the length of a central pipe of a primary multi-layer packing system of a cased well is generally not more than 150 meters in 7'). The method can obviously reduce the liquid circulation friction of the multilayer gravel packing system, further increase the accumulated construction length of the once multilayer gravel packing tool to 9-5/8 'of the length of a central pipe of the once multilayer packing system of a cased well exceeds 600 meters, and the length of the central pipe of the once multilayer packing system of a 7' cased well exceeds 300 meters, and can be applied to the once multilayer gravel packing fracturing sand control operation of a large-span perforation section. In addition, the invention can realize the layered exploitation without running a lower well completion production string (a production sliding sleeve, an insertion seal and the like).
Drawings
FIG. 1 is a schematic illustration of an outer tubular string according to the present invention;
FIG. 2 is a schematic view of a service string of the present invention;
FIG. 3 is a flow chart of setting a packer using the present invention;
FIG. 4 is a flow chart of a packer being tested according to the present invention;
FIG. 5 is a flow chart of a positive cycle pack fracturing process employing the present invention;
FIG. 6 is a flow chart of reverse circulation sand washing using the present invention;
FIG. 7 is a flow chart of a production process using the present invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 7, a large-span perforated section once multi-layered gravel packing tool, which is provided with an upper perforated layer, zero to a plurality of middle perforated layers, and a bottom perforated layer, includes an outer string longitudinally penetrating the entire perforated section and a service string lowered into the outer string.
The outer tubular column comprises a sand setting packer 16, an outer tubular column main body part and a top packer assembly, wherein the sand setting packer 16, the outer tubular column main body part and the top packer assembly are sequentially arranged from bottom to top, and the outer tubular column main body part is inserted into the upper part of the sand setting packer 16.
The top packer assembly comprises a top packer 1, an upper core sealing barrel 7, a filling sliding sleeve 8, a lower core sealing barrel 9 and a display fixing sealing barrel 10 which are sequentially connected from top to bottom.
The main body part of the outer-layer pipe column comprises bottom operation pipe sections corresponding to the bottom perforation layers, middle operation pipe sections corresponding to all the middle perforation layers one to one and sand control sections corresponding to the upper perforation layers.
The sand control section, the middle operation pipe section and the bottom operation pipe section are all provided with a sand control screen 13 corresponding to the corresponding perforation layer 3 and an inner lining pipe 12 thereof, an annular space is formed between the inner lining pipe 12 and the sand control screen 13, and the inner lining pipe 12 is connected with a production circulating sliding sleeve 14.
The upper ends of the sand control section, the middle operation pipe section and the bottom operation pipe section sieve pipe 13 are connected with a blind pipe 11.
Middle part operation pipeline section with 11 upper ends of bottom operation pipeline section blind pipe are equipped with from supreme demonstration fixed seal section of thick bamboo 10, the sealed section of thick bamboo 9 of lower part core, fill sliding sleeve 8 and the sealed section of thick bamboo 7 of upper portion core, keep apart packer 6 and the lower part of connecting gradually and test a sealed section of thick bamboo 5, show fixed seal section of thick bamboo 10 with the upper end of blind pipe 11 is connected, in this embodiment, for the ease of operation, a sealed section of thick bamboo 5 adoption levogyration is tested to the lower part.
And an upper seal checking sealing cylinder 4 positioned above the production circulating sliding sleeve 14 is arranged on the inner lining pipe 12 of the middle operation pipe section and the upper operation pipe section.
The blind pipe 11 of the sand control section is connected with the display fixing sealing cylinder 10 of the top packer assembly.
And the lower end of the bottom operation pipe section is provided with an anchoring insertion seal 15 which is inserted and fixed at the upper part of the sand setting packer 16.
The service string is equipped with from last to going into the wash pipe 17 down that connects gradually, fill instrument 19, load display 27, sliding sleeve operation tool, match long wash pipe and bottom isolation tube down, for convenient operation in this embodiment, sliding sleeve operation tool includes from last to the sliding sleeve closing tool 28, sliding sleeve switch tool 29, the sliding sleeve opening tool 30 that connects gradually down.
The bottom isolation pipe is characterized in that a guide shoe 34 is arranged at the bottom of the bottom isolation pipe, a bottom isolation check valve 33 is arranged inside the bottom isolation pipe, a bottom isolation circulation hole 31 is formed in the upper portion of the bottom isolation pipe, a bottom isolation sealing module I32-1 and a bottom isolation sealing module II 32-2 which are installed on the bottom isolation pipe are arranged below the bottom isolation circulation hole 31, and the bottom isolation sealing module I32-1 is close to the bottom isolation circulation hole 31 than the bottom isolation sealing module II 32-2.
The filling tool 19 is provided with a positive circulation short section 18, a filling bypass short section 22 and a reverse circulation short section which are sequentially connected from top to bottom.
The bottom of the reverse circulation nipple is provided with a check valve 26, the reverse circulation nipple is provided with a reverse circulation hole 24, the reverse circulation nipple is provided with a hydraulic positioner 25, a sealing module III 21-3 and a sealing module IV 21-4, the reverse circulation hole 24, the sealing module III 21-3 and the sealing module IV 21-4 are all located above the hydraulic positioner 25, and the sealing module III 21-3 and the sealing module IV 21-4 are respectively located on the upper side and the lower side of the reverse circulation hole 24.
The filling bypass short section 22 and the normal circulation short section both adopt a double-layer structure and are provided with annular spaces, the annular space of the normal circulation short section 18 passes through the annular space of the filling bypass short section 22 and is connected with the reverse circulation short section, and a bypass filling hole 23 is formed in the filling bypass short section 22.
The positive circulation nipple 18 is provided with a sealing module I21-1 and a sealing module II 21-2, the outer wall of the positive circulation nipple 18 is provided with a circulation hole 20 communicated with the annulus of the positive circulation nipple, and the circulation hole 20 is positioned above the sealing module I21-1 and the sealing module II 21-2.
In the process of carrying out sand control operation on a bottom perforating layer, when setting, a sealing module II 21-2 on the service pipe column is matched and sealed with a lower seal-testing sealing barrel 5 on the bottom operation pipe section, a sealing module III 21-3 on the service pipe column is matched and sealed with an upper core sealing barrel 7 on the bottom operation pipe section, and a filling hole 23 is positioned between the lower seal-testing sealing barrel 5 on the bottom operation pipe section and the upper core sealing barrel 7 on the bottom operation pipe section to construct a setting channel of a bottom operation pipe section isolation packer; when the seal is tested, a sealing module I21-2 on the service pipe column is matched and sealed with an upper seal testing sealing barrel 4 on the bottom operation pipe section, a sealing module II 21-3 on the service pipe column is matched and sealed with a lower seal testing sealing barrel 5 on the bottom operation pipe section, and the filling hole 23 is positioned between the upper seal testing sealing barrel 4 on the bottom operation pipe section and the lower seal testing sealing barrel 5 on the bottom operation pipe section to construct a seal testing inlet channel of an isolation packer 6 of the bottom operation pipe section; when filling and fracturing, the hydraulic positioner 25 is located on the display fixed sealing barrel 10 on the bottom operation pipe section and is in sealing connection with the display fixed sealing barrel, the sealing module II 21-2 on the service pipe column is in matched sealing with the upper core sealing barrel 7 on the bottom operation pipe section, the sealing module III 21-3 on the service pipe column is in matched sealing with the lower core sealing barrel 9 on the bottom operation pipe section, the filling hole 23 is located between the upper core sealing barrel 7 on the bottom operation pipe section and the lower core sealing barrel 9 on the bottom operation pipe section, and the reverse circulation hole 24 is located below the lower core sealing barrel 9 on the bottom operation pipe section to construct a positive circulation channel; during reverse circulation cleaning, a sealing module IV 21-4 on the service pipe column is matched and sealed with a lower core sealing barrel 9 on the bottom operation pipe section, a sealing module II 21-2 on the service pipe column is matched and sealed with an upper core sealing barrel 7 on the bottom operation pipe section, and the filling hole 23 and the reverse circulation hole 24 are positioned between the upper core sealing barrel 7 on the bottom operation pipe section and the lower core sealing barrel 9 on the bottom operation pipe section, so that a reverse circulation cleaning channel is constructed.
In the process of carrying out sand prevention operation on the middle perforation layer, when setting, a sealing module II 21-2 on the service pipe column is matched and sealed with a middle seal-testing sealing barrel 5 on the middle operation pipe section, a sealing module III 21-3 on the service pipe column is matched and sealed with an upper core sealing barrel 7 on the middle operation pipe section, and the filling hole 23 is positioned between the middle seal-testing sealing barrel 5 of the middle operation pipe section and the upper core sealing barrel 7 of the middle operation pipe section to construct a setting channel of an isolation packer 6 of the middle operation pipe section; when the seal is tested, a sealing module I21-2 on the service pipe column is matched and sealed with an upper seal testing sealing barrel 4 on the middle operation pipe section, a sealing module II 21-3 on the service pipe column is matched and sealed with a lower seal testing sealing barrel 5 on the middle operation pipe section, the filling hole 23 is positioned between the upper seal testing sealing barrel 4 of the middle operation pipe section and the lower seal testing sealing barrel 5 of the middle operation pipe section, a seal testing inlet channel of an isolation packer 6 of the middle operation pipe section is constructed, and a bottom isolation sealing module II 32-2 on the service pipe column is matched and sealed with the lower seal testing sealing barrel 5 adjacent to the lower isolation sealing barrel of the operation pipe section, so that a bottom isolation upward return channel is constructed; when filling and fracturing, the hydraulic positioner 25 is located on the display fixed sealing barrel 10 of the middle operation pipe section and is in sealing connection with the display fixed sealing barrel, the sealing module II 21-2 on the service pipe column is in matching sealing with the upper core sealing barrel 7 on the middle operation pipe section, the sealing module III 21-3 on the service pipe column is in matching sealing with the lower core sealing barrel 9 on the middle operation pipe section, the filling hole 23 is positioned between the upper core sealing barrel 7 of the middle operation pipe section and the lower core sealing barrel 9 of the middle operation pipe section, the reverse circulation hole 24 is positioned below the lower core sealing barrel 9 of the middle operation pipe section to construct a positive circulation channel, the bottom isolation sealing module I32-1 on the service pipe column is in matching sealing with the lower test sealing barrel 5 adjacent to the operation pipe section, constructing a bottom isolated upward return channel; when reverse circulation cleaning is carried out, the sealing module IV 21-4 on the service pipe column is matched and sealed with the lower core sealing barrel 9 on the middle operation pipe section, the sealing module II 21-2 on the service pipe column is matched and sealed with the upper core sealing barrel 7 on the middle operation pipe section, and the filling hole 23 and the reverse circulation hole 24 are positioned between the upper core sealing barrel 7 of the middle operation pipe section and the lower core sealing barrel 9 of the middle operation pipe section, so that a reverse circulation cleaning channel is constructed.
In the process of carrying out sand control operation on an upper perforation layer, when filling and fracturing, the hydraulic positioner 25 is located on the display fixed sealing barrel 10 of the top packer assembly and is in sealing connection with the display fixed sealing barrel 10, the sealing module II 21-2 on the service string is matched and sealed with the upper core sealing barrel 7 on the top packer assembly, the sealing module III 21-3 on the service string is matched and sealed with the lower core sealing barrel 9 on the top packer assembly, the filling hole 23 is located between the upper core sealing barrel 7 of the top packer assembly and the lower core sealing barrel 9 of the top packer assembly, the reverse circulation hole 24 is located below the lower core sealing barrel 9 of the top packer assembly to construct a positive circulation channel, the bottom isolation sealing module I32-1 on the service string is matched and sealed with the lower test sealing barrel 5 adjacent to the sand control section, constructing a bottom isolated upward return channel; when reverse circulation cleaning is carried out, a sealing module IV 21-4 on the service pipe column is matched and sealed with a lower core sealing barrel 9 of the top packer assembly, a sealing module II 21-2 on the service pipe column is matched and sealed with an upper core sealing barrel 7 of the top packer assembly, and the filling hole 23 and the reverse circulation hole 24 are positioned between the upper core sealing barrel 7 of the top packer assembly and the lower core sealing barrel 9 of the top packer assembly, so that a reverse circulation cleaning channel is constructed.
When in use, the sand prevention operation is carried out layer by layer from bottom to top
1) Performing sand control operation on the bottom perforation layer
The service string is first operated with the filling tool thereon in the upper portion of the bottom service string section and then operated according to the following steps:
1.1) setting
Setting of the bottom service pipe section isolation packer 6 is performed by pressurizing the inside of the drill pipe.
1.2) seal inspection
And lifting the service pipe column, constructing a seal checking inlet channel of the bottom operation pipe section isolation packer 6, and then performing seal checking on the bottom operation pipe section isolation packer 6 by pressurizing in the drill pipe.
1.3) pack fracturing
A service pipe column is lowered, and a positive circulation channel is constructed; then filling liquid is filled in the drill pipe, the filling liquid carries ceramsite to enter the sand prevention section on the outer side of the sieve pipe through the lower wash pipe 17, the filling holes 23 and the filling sliding sleeve 8, the ceramsite is filled in the stratum, the sand-carrying liquid after desanding enters the bottom isolation pipe of the service pipe column through the production circulation sliding sleeve 14 and the bottom isolation circulation hole 31, and the sand-carrying liquid goes upward to enter an annulus between the service pipe column and the outer pipe column through the circulation hole 20 and returns out of the well head.
1.4) reverse circulation cleaning
And lifting the service pipe column, constructing a reverse circulation cleaning channel, and then cleaning the residual ceramsite in the service pipe column to a well head through the annular reverse circulation completion fluid of the outer layer pipe column.
So far, the sand control operation of the bottom perforation layer is completed.
2) Sand control operation of middle shot hole layer
The service string is first lifted up so that the filling tool thereon is located in the upper portion of the middle service pipe section, and then the operation is performed according to the following steps:
2.1) setting
The operation was carried out according to step 1.1).
2.2) seal inspection
Firstly, constructing a seal checking access channel according to the step 1.2), and constructing a bottom isolation upward return channel at the same time; and then carrying out seal checking operation according to the step 1.2).
2.3) pack fracturing
Firstly, constructing a seal checking inlet positive circulation channel according to the step 1.3), and constructing a bottom isolation upward return channel at the same time; then the filling fracturing operation is carried out according to the step 1.3).
2.4) reverse circulation cleaning
Performing operation according to the step 1.4);
thus, the sand control operation of the middle perforation layer adjacent to the bottom perforation layer is completed. If the middle perforated layer has more than one layer, the step 3.2) should be repeated until the sand control operation of all the middle perforated layers is completed.
3) Performing sand control operation on the upper shot hole layer
The service string is first lifted with the packing tools thereon in the upper portion of the sand control section and within the top packer assembly, and then operated according to the following steps:
3.1) pack fracturing
The operation was carried out according to step 3.2.3).
3.2) reverse circulation cleaning
The operation is carried out according to step 3.2.4).
So far, the sand control operation of the whole large-span perforation section is completely finished.
4) The service pipe column is lifted out of the casing 1, and oil extraction production can be carried out.
After the sand control operation of each perforation layer is completed, namely after the reverse circulation cleaning is finished, the filling quality and the sliding sleeve need to be verified, and the method is the same as the prior art and is not repeated herein. Different from the prior art: the open and close state of the production circulation sliding sleeve 14 can be controlled by operating the service pipe column according to production requirements. In the event that the formation does not require oil production, the service string needs to be operated to close the production cycle sleeve 14, otherwise the production cycle sleeve 14 should remain open.
In the present invention, the screen 13, inner liner 12 and production cycle sleeve 14 comprise a double tubular structure, the outer tubular string being permanently placed in the well. The double-layer pipe structure provides a sand-carrying fluid circulation channel after sand removal and a production fluid circulation channel during production during filling. The inner liner pipe 12 of the double-layer pipe structure ensures that the upper layer section is in an isolated state during filling, and the annular pressure completely acts on the operation layer; meanwhile, the inner liner 12 ensures that the lower interval is isolated during filling, and the pressure and liquid in the annulus or the drill pipe completely act on the working layer.
The production circulation sliding sleeve 14 on the lining pipe on the inner layer and the filling sliding sleeve 8 are controlled by the same opening and closing tools, the opening and closing tools can control the opening and closing of all the sliding sleeves in the outer layer pipe column, and the production circulation sliding sleeve on the lining pipe and the filling sliding sleeve are opened and closed by the same opening and closing tools, so that the operability of the system is enhanced.
Production of each orifice layer can be accomplished by opening and closing the production circulation sleeve 14 on the inner liner 12. And after the sand control operation is finished, opening and closing operation is carried out on each layer of production circulation sliding sleeves according to production requirements. The separate production operation can be realized without running a separate production string (a production sliding sleeve on the production string, an insertion seal, a connecting oil pipe and the like).
The inner liner pipe 12 is arranged in the screen pipe, the inner liner pipe 12 is connected with the production circulation sliding sleeve 14 to form an inner liner pipe, the screen pipe 13, the inner liner pipe 12 and the production circulation sliding sleeve 14 are integrated in the whole sand control fracturing operation process and the later production process, and the structure can realize the state control of opening or closing the screen pipe in any state, so that the screen pipe can be selectively changed into a 'blind pipe'.
The closed or open state of the liner tube in the inner layer of the screen tube is controllable, which is different from the prior art that the screen tube part can only be in the open state. Thus, during the actual filling operation, it is not necessary to provide a series of seals including a top isolation seal, a bottom isolation seal, etc. to isolate the pressure of the drill pipe and casing and prevent the drill pipe and casing from entering the non-operational zone.
One or more production circulation sliding sleeves on the inner liner can be selectively arranged to provide a selective passage for the liquid to flow out during production. After the sand control fracturing operation is finished, the production circulation sliding sleeves on the lining pipes in each layer can be selectively opened or closed, so that the opening or closing state of the sieve pipe can be controlled. Therefore, the separate production string does not need to be put in (the sand control string is internally provided with an oil pipe and a sliding sleeve to be inserted and sealed, and the like), and the separate production can be realized.
The service string, all of the connecting strings except the packing tool 19, is of a single-layer structure, unlike the present primary multi-layer gravel packing tool (the upper portion is of a double-layer washpipe structure). The design increases the internal and external space of the filling pipe, and can achieve the effect of reducing the friction resistance of the liquid.
The service pipe column does not have a small space formed by a flushing pipe and a central pipe of a conventional service pipe column, and the small space can generate large friction resistance on passing fluid, and the friction resistance of the part accounts for most of the friction resistance of the whole operation. The single-layer service pipe column and the double-layer outer layer pipe column are matched to replace a small space, the area of a liquid flow channel is far larger than that of a flow channel in conventional sand prevention operation, and friction resistance can be greatly reduced. The whole service pipe column only needs a double-layer pipe column structure on the filling tool part, the length is only about 5 m, and the contribution to the whole friction resistance is small.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (4)
1. A large-span perforation section once multilayer gravel packing tool is provided with an upper perforation layer, zero to a plurality of middle perforation layers and a bottom perforation layer and is characterized in that the gravel packing tool comprises an outer tubular column longitudinally penetrating the whole perforation section and a service tubular column put into the outer tubular column,
the outer-layer tubular column comprises a sand setting packer, an outer-layer tubular column main body part inserted into the upper part of the sand setting packer and a top packer assembly connected with the outer-layer tubular column main body part, wherein the sand setting packer, the outer-layer tubular column main body part and the top packer assembly are sequentially arranged from bottom to top;
the top packer assembly comprises a top packer, an upper core sealing barrel, a filling sliding sleeve, a lower core sealing barrel and a display fixed sealing barrel which are sequentially connected from top to bottom;
the main body part of the outer-layer pipe column comprises bottom operation pipe sections corresponding to the bottom perforation layers, middle operation pipe sections corresponding to all the middle perforation layers one to one and sand control sections corresponding to the upper perforation layers;
the sand control section, the middle operation pipe section and the bottom operation pipe section are respectively provided with a sand control screen pipe corresponding to the corresponding perforation layer and an inner liner pipe thereof, an annular space is formed between the inner liner pipe and the sand control screen pipe, and the inner liner pipe is connected with a production circulation sliding sleeve;
the upper ends of the sand prevention section, the middle operation pipe section and the bottom operation pipe section are connected with a blind pipe;
the upper ends of the blind pipes of the middle operation pipe section and the bottom operation pipe section are provided with a display fixed sealing barrel, a lower core sealing barrel, a filling sliding sleeve, an upper core sealing barrel, an isolation packer and a lower seal-testing sealing barrel which are sequentially connected from bottom to top, and the display fixed sealing barrel is connected with the upper end of the blind pipe;
an upper seal checking sealing cylinder positioned above the production circulating sliding sleeve is arranged on the inner liner pipe of the middle operation pipe section and the sand prevention section;
the blind pipe of the sand control section is connected with the display fixing sealing cylinder of the top packer assembly;
the lower end of the bottom operation pipe section is provided with an anchoring insertion seal which is inserted and fixed at the upper part of the sand setting packer;
the service pipe column is provided with a lower-entering flushing pipe, a filling tool, a load display, a sliding sleeve operation tool, a length-matching flushing pipe and a bottom isolation pipe which are sequentially connected from top to bottom;
the bottom of the bottom isolation pipe is provided with a guide shoe, a bottom isolation check valve is arranged inside the bottom isolation pipe, the upper part of the bottom isolation pipe is provided with a bottom isolation circulating hole, a bottom isolation sealing module I and a bottom isolation sealing module II which are arranged on the bottom isolation pipe are arranged below the bottom isolation circulating hole, and the bottom isolation sealing module I is closer to the bottom isolation circulating hole than the bottom isolation sealing module II;
the filling tool is provided with a positive circulation short section, a filling bypass short section and a reverse circulation short section which are sequentially connected from top to bottom, the bottom of the reverse circulation short section is provided with a check valve, a reverse circulation hole is formed in the reverse circulation short section, a hydraulic positioner, a sealing module III and a sealing module IV are mounted on the reverse circulation short section, the reverse circulation hole, the sealing module III and the sealing module IV are all located above the hydraulic positioner, and the sealing module III and the sealing module IV are respectively located on the upper side and the lower side of the reverse circulation hole;
the filling bypass short section and the positive circulation short section both adopt a double-layer structure and are provided with annular spaces, the annular space of the positive circulation short section is connected with the reverse circulation short section through the annular space of the filling bypass short section, and a bypass filling hole is formed in the filling bypass short section;
a sealing module I and a sealing module II are installed on the positive circulation nipple, a circulation hole communicated with the positive circulation nipple in an annular space is formed in the outer wall of the positive circulation nipple, and the circulation hole is located above the sealing module I and the sealing module II;
in the process of carrying out sand control operation on a bottom perforation layer, when setting, a sealing module II on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the bottom operation pipe section, a sealing module III on the service pipe column is matched and sealed with an upper core sealing barrel on the bottom operation pipe section, and the filling hole is positioned between the lower seal testing sealing barrel on the bottom operation pipe section and the upper core sealing barrel on the bottom operation pipe section to construct a setting channel of a bottom operation pipe section isolation packer; when the seal is tested, a sealing module II on the service pipe column is matched and sealed with an upper seal testing sealing barrel on the bottom operation pipe section, a sealing module III on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the bottom operation pipe section, and the filling hole is positioned between the upper seal testing sealing barrel on the bottom operation pipe section and the lower seal testing sealing barrel on the bottom operation pipe section to construct a seal testing inlet channel of the bottom operation pipe section isolation packer; when filling and fracturing, the hydraulic positioner is located on a display fixed sealing cylinder on the bottom operation pipe section and is in sealing connection with the display fixed sealing cylinder, a sealing module II on the service pipe column is in matched sealing with an upper core sealing cylinder on the bottom operation pipe section, a sealing module III on the service pipe column is in matched sealing with a lower core sealing cylinder on the bottom operation pipe section, the filling hole is located between the upper core sealing cylinder on the bottom operation pipe section and the lower core sealing cylinder on the bottom operation pipe section, and the reverse circulation hole is located below the lower core sealing cylinder of the bottom operation pipe section to construct a forward circulation channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel on the bottom operation pipe section, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the bottom operation pipe section, and the filling hole and the reverse circulation hole are positioned between the upper core sealing barrel on the bottom operation pipe section and the lower core sealing barrel on the bottom operation pipe section, so that a reverse circulation cleaning channel is constructed;
in the process of carrying out sand prevention operation on the middle perforation layer, when setting, a sealing module II on the service pipe column is matched and sealed with a middle seal testing sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is matched and sealed with an upper core sealing barrel on the middle operation pipe section, and the filling hole is positioned between the middle seal testing sealing barrel of the middle operation pipe section and the upper core sealing barrel of the middle operation pipe section to construct a setting channel of an isolation packer of the middle operation pipe section; when the seal is tested, a sealing module II on the service pipe column is matched and sealed with an upper seal testing sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is matched and sealed with a lower seal testing sealing barrel on the middle operation pipe section, the filling hole is positioned between the upper seal testing sealing barrel on the middle operation pipe section and the lower seal testing sealing barrel on the middle operation pipe section, a seal testing inlet channel of an isolation packer of the middle operation pipe section is constructed, a bottom isolation sealing module II on the service pipe column is matched and sealed with the lower seal testing sealing barrel adjacent to the lower seal testing sealing barrel under the operation pipe section, and a bottom isolation upward return channel is constructed; when filling and fracturing, the hydraulic positioner is located on a display fixed sealing barrel of the middle operation pipe section and is in sealing connection with the display fixed sealing barrel, a sealing module II on the service pipe column is in matched sealing with an upper core sealing barrel on the middle operation pipe section, a sealing module III on the service pipe column is in matched sealing with a lower core sealing barrel on the middle operation pipe section, the filling hole is located between the upper core sealing barrel of the middle operation pipe section and the lower core sealing barrel of the middle operation pipe section, the reverse circulation hole is located below the lower core sealing barrel of the middle operation pipe section to construct a forward circulation channel, and a bottom isolation sealing module I on the service pipe column is in matched sealing with the lower seal testing barrel adjacent to the lower core sealing barrel under the operation pipe section to construct a bottom isolation upward return channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel on the middle operation pipe section, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the middle operation pipe section, and the filling hole and the reverse circulation hole are positioned between the upper core sealing barrel of the middle operation pipe section and the lower core sealing barrel of the middle operation pipe section, so that a reverse circulation cleaning channel is constructed;
in the process of carrying out sand control operation on an upper perforation layer, when filling and fracturing, the hydraulic positioner is located on a display fixed sealing barrel of the top packer assembly and is in sealing connection with the display fixed sealing barrel, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel on the top packer assembly, a sealing module III on the service pipe column is matched and sealed with a lower core sealing barrel on the top packer assembly, the filling hole is positioned between the upper core sealing barrel of the top packer assembly and the lower core sealing barrel of the top packer assembly, the reverse circulation hole is positioned below the lower core sealing barrel of the top packer assembly to construct a forward circulation channel, and a bottom isolation sealing module I on the service pipe column is matched and sealed with a lower seal testing barrel adjacent to the sand control section, constructing a bottom isolated upward return channel; when reverse circulation cleaning is carried out, a sealing module IV on the service pipe column is matched and sealed with a lower core sealing barrel of the top packer assembly, a sealing module II on the service pipe column is matched and sealed with an upper core sealing barrel of the top packer assembly, and the filling hole and the reverse circulation hole are located between the upper core sealing barrel of the top packer assembly and the lower core sealing barrel of the top packer assembly, so that a reverse circulation cleaning channel is constructed.
2. The primary multi-layer gravel packing tool of a large-span perforated section of claim 1, wherein the sliding sleeve operation tool comprises a sliding sleeve closing tool, a sliding sleeve opening and closing tool and a sliding sleeve opening tool which are connected in sequence from top to bottom.
3. The primary large span perforating section multi-layer gravel packing tool of claim 1 wherein one or more of the production cycle slips are provided on each of the inner liners.
4. The primary large span perforating section gravel packing tool of claim 1 wherein the lower seal-off canister is a left-handed canister.
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CN111502609B (en) * | 2020-04-21 | 2022-06-03 | 中国海洋石油集团有限公司 | Water injection sand prevention pipe column capable of cleaning annular space of screen sleeve and well cleaning method |
CN111706303B (en) * | 2020-07-01 | 2022-03-25 | 杨国 | One-time multilayer gravel filling sand prevention process and filling sand prevention tool pipe column |
CN111963111A (en) * | 2020-07-08 | 2020-11-20 | 中国海洋石油集团有限公司 | Loose low-permeability open hole horizontal well filling sand prevention and staged fracturing integrated process method |
CN111927408A (en) * | 2020-10-10 | 2020-11-13 | 东营市瑞丰石油技术发展有限责任公司 | Packing string and sand control completion method |
CN111927379B (en) * | 2020-10-14 | 2020-12-15 | 东营市瑞丰石油技术发展有限责任公司 | Bypass packer |
CN113404441B (en) * | 2021-01-18 | 2024-11-01 | 中国海洋石油集团有限公司 | One-pass multi-layer filling sand prevention and layered injection and production integrated pipe column and use method thereof |
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