CN114482960B - Fracturing sand prevention method - Google Patents
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- CN114482960B CN114482960B CN202011152836.5A CN202011152836A CN114482960B CN 114482960 B CN114482960 B CN 114482960B CN 202011152836 A CN202011152836 A CN 202011152836A CN 114482960 B CN114482960 B CN 114482960B
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- 239000004576 sand Substances 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000002265 prevention Effects 0.000 title claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 132
- 238000010276 construction Methods 0.000 claims abstract description 42
- 239000006004 Quartz sand Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 81
- 238000011049 filling Methods 0.000 claims description 32
- 238000004519 manufacturing process Methods 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 24
- 230000035699 permeability Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000011001 backwashing Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000007596 consolidation process Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229920002907 Guar gum Polymers 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 229960002154 guar gum Drugs 0.000 claims description 2
- 235000010417 guar gum Nutrition 0.000 claims description 2
- 239000000665 guar gum Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 230000008719 thickening Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 5
- 230000005012 migration Effects 0.000 abstract description 4
- 238000013508 migration Methods 0.000 abstract description 4
- 238000002407 reforming Methods 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000012856 packing Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 241000219112 Cucumis Species 0.000 description 3
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 3
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of petroleum engineering, and relates to a fracturing sand prevention method. The invention makes the long and thin seam at the far end of the stratum by controlling the construction parameters, so that the seam extends as far as possible, thereby achieving the purpose of deeply reforming the stratum, making the short and wide seam in the near well zone, delaying the migration of stratum sand, improving the diversion capability of the near well zone, adopting the concretionary precoated sand when making the short and wide seam, further blocking quartz sand and the return of the precoated sand, and overcoming the phenomenon that the near well zone is easy to be blocked.
Description
Technical Field
The invention belongs to the technical field of petroleum engineering, and relates to a fracturing sand prevention method.
Background
The conventional fracturing sand control technology adopts high sand ratio and large discharge capacity to pump quartz sand to the stratum, so that short and wide-form high-permeability cracks are manufactured in the near-wellbore zone, the seepage capability of the near-wellbore zone is improved, the migration of stratum sand can be delayed, the stratum sand is blocked, and sand control is carried out. With the progress of the winning oilfield exploitation into the middle and later stages, the stratum structure is more and more loosened, the hypotonic reservoir layer also starts to sequentially produce sand, particularly the hypotonic high-argillaceous sand, and the stratum is reformed by adopting a conventional fracturing technology, so that the phenomena of fine sand and argillaceous blockage easily occur in the near-wellbore zone.
Chinese patent No. CN107461182B discloses a layered fracturing sand control method, which comprises the following steps: the oil layer is separated into a first permeability oil layer and a second permeability oil layer. Plugging the first permeability oil layer, and performing fracturing sand prevention on the second permeability oil layer. And after the fracturing sand prevention of the second permeability oil layer is finished, unblocking the first permeability oil layer, and performing fracturing sand prevention on the first permeability oil layer. The layered fracturing sand prevention method can divide an oil layer into a first permeability oil layer and a second permeability oil layer for layered fracturing sand prevention, and the fracturing sand prevention method is combined with the fracturing sand prevention by throwing balls to temporarily plug, so that the lower permeability oil layer is fractured and corresponding sand prevention propping agents are filled, and the pressure prevention effect of the lower permeability oil layer is improved. Meanwhile, the oil layer with higher permeability can be effectively filled by the sand control agent, and the difference of the permeability between layers is balanced. A sand blocking well wall with larger thickness is formed in a near-wellbore zone, an oil flow channel with high diversion capacity is established, the fracturing sand prevention effect is improved, and the production efficiency of an oil well is improved.
The Chinese patent CN103758494B discloses an outside-pipe staged fracturing sand control method of a horizontal well outside staged fracturing sand control pipe column, which comprises a packing well section and fracturing gravel packing sand control, and is characterized in that the packing well section is a well cementation outside-pipe packer and an outside-pipe packer which are put together during screen pipe well completion, and the open hole section is packed into 2-10 well sections; the fracturing gravel packing sand prevention is carried out by the following process steps: (A) A filling service pipe column is put into the outside section fracturing sand prevention well-leaving pipe column; (B) The fracturing gravel packing sand prevention, when filling the upper layer, the bottom isolation sealing assembly of the packing service pipe column is matched with the sealing cylinder on the lower layer packing tool assembly to ensure sealing and prevent packing liquid from entering the lower layer; (C) And (3) repeating the step (B), sequentially completing the fracturing gravel packing sand prevention of each layer, closing the mechanical sliding sleeve by using a sliding sleeve closing tool after the lower layer is packed, and finally completing the fracturing gravel packing sand prevention of the whole well section.
Chinese invention patent application CN109958417a discloses a fracturing sand control method, which comprises:
the fracturing sand prevention pipe column is put into a reservoir, the fracturing packer is set, and fracturing sand filling operation is carried out;
After the fracturing sand filling operation is completed, a soluble ball is thrown into the oil pipe, and the oil pipe is pressed, so that the ball seat drives the sand control screen pipe to move downwards until the female buckle is clamped in the limiting groove, and the sand control screen pipe reaches a target position;
Standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls;
The fracturing fluid is returned to the ground through the oil pipe;
and releasing the fracturing packer through the releasing mechanism, and separating the tubular column at the upper part of the fracturing packer.
By adopting the method, the phenomenon of fine sand powder and mud blocking occurs. Aiming at the problem of easy blockage, a simple and effective fracturing sand control method for preventing blockage needs to be provided.
Disclosure of Invention
The invention mainly aims to provide a fracturing sand control method, which is characterized in that by controlling construction parameters, an elongated slot is manufactured at the far end of a stratum, so that the slot is extended as far as possible, the purpose of deeply reforming the stratum is achieved, a short wide slot is manufactured in a near-wellbore zone, the migration of stratum sand is delayed, the diversion capacity of the near-wellbore zone is improved, meanwhile, concretionary precoated sand is adopted when the short wide slot is manufactured, the return of quartz sand and the precoated sand is further blocked, and the phenomenon that the near-wellbore zone is easy to be blocked is overcome.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a fracturing sand control method, which comprises the following steps:
pumping the pre-liquid;
Manufacturing an elongated slot at the far end of the stratum, and pumping a propping agent into the stratum by utilizing sand-carrying fluid according to the small sand ratio and high-displacement technological parameters;
Manufacturing a wide seam at the near end of the stratum, and carrying the concretionary precoated sand into the stratum by using sand-carrying fluid according to the technological parameters of high sand ratio and small displacement;
sealing and circularly filling by adopting precoated sand;
pumping in displacement fluid, backwashing the well, lifting out the pipe column, and finishing the construction.
Further, in the stage of pumping the front-end fluid, a crack is formed in the reservoir by utilizing the water pressure of the sand-carrying fluid, so that propping agent in the sand-carrying fluid can enter the crack; the sand-carrying fluid accounts for 10-20wt% of the total sand-carrying fluid.
Further, in the stage of manufacturing an elongated slot at the far end of the stratum, the specific parameters of the small sand ratio and the high discharge capacity are as follows: the usage amount of the quartz sand is 5-10wt% of the sand-carrying fluid; the discharge capacity is more than or equal to 2m 3.
Further, in the stage of manufacturing the long and thin seam at the far end of the stratum, the sand-carrying fluid is used in an amount of 50-70wt% of the total sand-carrying fluid.
Further, in the stage of manufacturing the wide seam at the near end of the stratum, the specific parameters of high sand ratio and small discharge capacity are as follows: the usage amount of the precoated sand is 70-90wt% of the sand-carrying fluid; the displacement is less than 2m 3.
Further, in the stage of manufacturing the wide seam at the near end of the stratum, the sand-carrying fluid is adopted, and the using amount of the sand-carrying fluid accounts for 10-30wt% of the total sand-carrying fluid.
Further, adopting precoated sand for sealing and circulating filling, wherein the ratio of the precoated sand to the sand is 90-100%, and the discharge capacity is less than 2m 3; the using amount of the sand-carrying fluid is 1-2% of the total sand-carrying fluid; the using amount of the sand-carrying fluid is less than 10wt% of the total sand-carrying fluid.
Further, the method further comprises the step of optimizing double-crack fracturing filling sand prevention construction parameters by utilizing three-dimensional fracturing simulation software, and optimizing a pumping program with optimal crack morphology and diversion capacity;
Calculating the extension pressure and displacement of the crack through a step displacement test result and software simulation; and calculating the closing pressure and closing time of the crack, the bottom hole construction pressure, the fracturing fluid efficiency and the fluid loss coefficient through small fracturing and simulation software, correcting a pumping program through a calculation result, and optimizing the sand-carrying fluid performance.
Further, the sand-carrying fluid should satisfy the following conditions: the viscosity of the joint and sand carrying; lower fluid loss, low residue, compatibility with stratum fluid, controllable gel breaking, easy flowback and excellent resistance reducing performance.
Further, the sand-carrying fluid comprises polymer sand-carrying fluid, guar gum sand-carrying fluid and thickening sand-carrying fluid.
Further, the propping agent used for manufacturing the elongated slot can be quartz sand or ceramic grains; the consolidation strength of precoated sand used for manufacturing the wide seam is more than 4MPa, and the permeability is more than 2D.
Compared with the prior art, the invention has the following advantages:
The method of the invention makes the long and thin seam in the stratum by the remote end, so that the seam extends to the remote end as far as possible, thereby achieving the aim of reforming the stratum. The short wide seam is manufactured at the near end of the stratum, so that fine sand is removed, and the migration of stratum particles is delayed.
The invention adopts precoated sand for sealing and circulating filling, thereby effectively preventing quartz sand from spitting back, avoiding the blockage of a sand filtering pipe and being beneficial to the discharge of fine sand.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, and/or combinations thereof.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
A method of fracturing sand control comprising the steps of:
Step 1, manufacturing an elongated slot at the far end of a stratum, and initially adopting a small sand ratio and a large discharge capacity, wherein the adopted sand-carrying fluid accounts for 50-70wt% of the total sand-carrying fluid; and (3) manufacturing a wide seam at the near end of the stratum, adopting a design principle that the sand carrying fluid is 10-30wt% of the total sand carrying fluid by adopting a high sand ratio and a small discharge capacity, and optimizing double-crack fracturing filling sand prevention construction parameters by utilizing three-dimensional fracturing simulation software to optimize a pumping program with optimal crack morphology and flow conductivity.
Step 2, calculating crack extension pressure and displacement through a step displacement test result and software simulation; and (3) calculating the closing pressure and closing time of the crack, the bottom hole construction pressure, the fracturing fluid efficiency and the fluid loss coefficient through small fracturing and simulation software, correcting the pumping program in the step (1) through calculation results, and optimizing the sand-carrying fluid performance.
Target well reservoir conditions: the porosity ranges from 12.3% to 39.9%, and averages 23.7%; the permeability range is 60×10 -3um2, the clay content is 12%, the layer thickness is 4.8m, and the top depth of the oil layer is as follows: 3380m, and plugs the formation. The final pumping parameters are as follows
Filling tool depth of penetration: 3360m
Sand carrying fluid used in the method: melon gum sand-carrying liquid
The propping agent used: ceramsite
Construction parameters: as shown in table 1 below:
Table 1 construction parameters for each stage described in example 1
And 3, putting a fracturing filling sand control pipe column into the well bore.
Step 4, setting and filling tools: opening the extrusion filling channel and installing the wellhead.
And 5, pumping the pre-liquid according to the determined construction parameters.
And 6, manufacturing an elongated slot at the far end of the stratum according to the determined construction parameters.
And 7, manufacturing a wide seam at the near end of the stratum according to the determined construction parameters.
Step 8, sealing and circularly filling by adopting precoated sand according to the determined construction parameters; the precoated sand is required to have consolidation strength of more than 4MPa and permeability of more than 2D.
Step 9, pumping in displacement fluid according to the determined construction parameters, and stopping the pump to perform the next backwashing well procedure when the displacement fluid reaches a set amount; and (3) back flushing: and the discharge capacity is more than 500L/min, and the redundant gravel in the pipe is washed out until the returned liquid is free of sand and clean.
Step 10, releasing, and pulling out a tubular column: and (5) disassembling the wellhead, rotating the pipe column forward for 50 circles, and releasing the pipe column and pulling out the pipe column. And (3) providing a sand prevention filling pipe column, and finishing the construction.
Well production effect: the early stage adopts 5 parts of extrusion filling liquid, the oil quantity is less than 1 part, the liquid quantity is 7.8 parts, the oil quantity is 6.5 parts after the fracturing sand prevention method is adopted for construction, and the effective period is more than 2 years; meanwhile, the occurrence of fine sand and mud blocking is obviously reduced.
Example 2
A method of fracturing sand control comprising the steps of:
Step 1, manufacturing an elongated slot at the far end of a stratum, and initially adopting a small sand ratio and a large discharge capacity, wherein the adopted sand-carrying fluid accounts for 50-70wt% of the total sand-carrying fluid; and (3) manufacturing a wide seam at the near end of the stratum, adopting a design principle that the sand carrying fluid is 10-30wt% of the total sand carrying fluid by adopting a high sand ratio and a small discharge capacity, and optimizing double-crack fracturing filling sand prevention construction parameters by utilizing three-dimensional fracturing simulation software to optimize a pumping program with optimal crack morphology and flow conductivity.
Step 2, calculating crack extension pressure and displacement through a step displacement test result and software simulation; and (3) calculating the closing pressure and closing time of the crack, the bottom hole construction pressure, the fracturing fluid efficiency and the fluid loss coefficient through small fracturing and simulation software, correcting the pumping program in the step (1) through calculation results, and optimizing the sand-carrying fluid performance.
Target well reservoir conditions: the porosity range is 35.8%; the permeability is 120 multiplied by 10 < -3 > um < 2 >, the clay content is 15.7%, the top depth of the oil layer is 1657m, and the thickness of the oil layer is 3.8m, sand is produced and the stratum is blocked. The final construction conditions are as follows:
Filling tool depth of penetration: 1640m
Sand carrying fluid used in the method: melon gum sand-carrying liquid
The propping agent used: quartz sand construction parameters: as shown in table 2 below:
Table 2 construction parameters for each stage described in example 2
And 3, putting a fracturing filling sand control pipe column into the well bore.
Step 4, setting and filling tools: opening the extrusion filling channel and installing the wellhead.
And 5, pumping the pre-liquid according to the determined construction parameters.
And 6, manufacturing an elongated slot at the far end of the stratum according to the determined construction parameters.
And 7, manufacturing a wide seam at the near end of the stratum according to the determined construction parameters.
Step 8, sealing and circularly filling by adopting precoated sand according to the determined construction parameters; the precoated sand is required to have consolidation strength of more than 4MPa and permeability of more than 2D.
Step 9, pumping in displacement fluid according to the determined construction parameters, and stopping the pump to perform the next backwashing well procedure when the displacement fluid reaches a set amount; and (3) back flushing: and the discharge capacity is more than 500L/min, and the redundant gravel in the pipe is washed out until the returned liquid is free of sand and clean.
Step 10, releasing, and pulling out a tubular column: and (5) disassembling the wellhead, rotating the pipe column forward for 50 circles, and releasing the pipe column and pulling out the pipe column. And (3) providing a sand prevention filling pipe column, and finishing the construction.
Well production effect: after the new well is put into production and constructed by adopting the method described in the embodiment 2, the phenomena of fine sand powder and mud blocking are obviously reduced; the liquid amount is 14.77 square, the oil amount is 7.14 square, and the oil amount is higher than that of other oil wells in the zone.
Example 3
A method of fracturing sand control comprising the steps of:
Step 1, manufacturing an elongated slot at the far end of a stratum, and initially adopting a small sand ratio and a large discharge capacity, wherein the adopted sand-carrying fluid accounts for 50-70wt% of the total sand-carrying fluid; and (3) manufacturing a wide seam at the near end of the stratum, adopting a design principle that the sand carrying fluid is 10-30wt% of the total sand carrying fluid by adopting a high sand ratio and a small discharge capacity, and optimizing double-crack fracturing filling sand prevention construction parameters by utilizing three-dimensional fracturing simulation software to optimize a pumping program with optimal crack morphology and flow conductivity.
Step 2, calculating crack extension pressure and displacement through a step displacement test result and software simulation; and (3) calculating the closing pressure and closing time of the crack, the bottom hole construction pressure, the fracturing fluid efficiency and the fluid loss coefficient through small fracturing and simulation software, correcting the pumping program in the step (1) through calculation results, and optimizing the sand-carrying fluid performance.
Target well reservoir conditions: the porosity range is 35.8%; the permeability is 120X 10 -3um2, the clay content is 15.7%, the top depth of the oil layer is 1657m, the thickness of the oil layer is 3.8m, sand is produced, and the stratum is blocked. The final construction conditions are as follows:
Filling tool depth of penetration: 1640m
Sand carrying fluid used in the method: melon gum sand-carrying liquid
The propping agent used: quartz sand construction parameters: as shown in table 2 below:
TABLE 3 construction parameters for each stage described in example 3
And 3, putting a fracturing filling sand control pipe column into the well bore.
Step 4, setting and filling tools: opening the extrusion filling channel and installing the wellhead.
And 5, pumping the pre-liquid according to the determined construction parameters.
And 6, manufacturing an elongated slot at the far end of the stratum according to the determined construction parameters.
And 7, manufacturing a wide seam at the near end of the stratum according to the determined construction parameters.
Step 8, sealing and circularly filling by adopting precoated sand according to the determined construction parameters; the precoated sand is required to have consolidation strength of more than 4MPa and permeability of more than 2D.
Step 9, pumping in displacement fluid according to the determined construction parameters, and stopping the pump to perform the next backwashing well procedure when the displacement fluid reaches a set amount; and (3) back flushing: and the discharge capacity is more than 500L/min, and the redundant gravel in the pipe is washed out until the returned liquid is free of sand and clean.
Step 10, releasing, and pulling out a tubular column: and (5) disassembling the wellhead, rotating the pipe column forward for 50 circles, and releasing the pipe column and pulling out the pipe column. And (3) providing a sand prevention filling pipe column, and finishing the construction.
Well production effect: after the fracturing sand prevention method described in the embodiment 3 is adopted for construction, the phenomena of fine sand generation and muddy blockage are obviously reduced; liquid amount is 12.9 square, oil amount is 9.6 square.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (4)
1. The fracturing sand prevention method is characterized by comprising the following steps of:
pumping the pre-liquid;
Manufacturing an elongated slot at the far end of the stratum, and pumping a propping agent into the stratum by utilizing sand-carrying fluid according to the small sand ratio and high-displacement technological parameters;
Manufacturing a wide seam at the near end of the stratum, and carrying the concretionary precoated sand into the stratum by using sand-carrying fluid according to the technological parameters of high sand ratio and small displacement;
sealing and circularly filling by adopting precoated sand;
pumping in displacement fluid, backwashing the well, lifting out a tubular column, and finishing construction;
A stage of pumping the front-end fluid, wherein a crack is formed in the reservoir by utilizing the water pressure of the sand-carrying fluid, so that propping agent in the sand-carrying fluid can enter the crack; the sand-carrying fluid consumption accounts for 10-20wt% of the total sand-carrying fluid;
and in the stage of manufacturing an elongated slot at the far end of the stratum, the specific parameters of the small sand ratio and the high discharge capacity are as follows: the usage amount of the quartz sand is 5-10wt% of the sand-carrying fluid; the discharge capacity is more than or equal to 2m 3;
In the stage of manufacturing the long and thin seam at the far end of the stratum, the sand-carrying fluid is used in an amount of 50-70wt% of the total sand-carrying fluid;
in the stage of manufacturing the wide seam at the near end of the stratum, the specific parameters of high sand ratio and small discharge capacity are as follows: the usage amount of the precoated sand is 70-90wt% of the sand-carrying fluid; the displacement is less than 2m 3;
in the stage of manufacturing the wide seam at the near end of the stratum, the sand-carrying fluid is used in an amount of 10-30wt% of the total sand-carrying fluid;
Adopting precoated sand for sealing and circulating filling, wherein the ratio of the precoated sand to the sand is 90-100%, and the discharge capacity is less than 2m 3; the using amount of the sand-carrying fluid is 1-2% of the total sand-carrying fluid; the using amount of the sand-carrying fluid is less than 10wt% of the total sand-carrying fluid.
2. The method of claim 1, further comprising optimizing the dual fracture pack sand control construction parameters using three dimensional fracture simulation software, optimizing a pumping procedure for optimal fracture morphology and conductivity;
Calculating the extension pressure and displacement of the crack through a step displacement test result and software simulation; and calculating the closing pressure and closing time of the crack, the bottom hole construction pressure, the fracturing fluid efficiency and the fluid loss coefficient through small fracturing and simulation software, correcting a pumping program through a calculation result, and optimizing the sand-carrying fluid performance.
3. The method according to claim 1 or 2, wherein the sand-carrying fluid should satisfy the following conditions: the viscosity of the joint and sand carrying; the oil-water separator has the advantages of low fluid loss, low residue, compatibility with stratum fluid, controllable gel breaking, easy flowback and excellent resistance reduction performance;
The sand-carrying fluid comprises polymer sand-carrying fluid, guar gum sand-carrying fluid and thickening sand-carrying fluid.
4. A method according to claim 1 or 2, wherein the proppants used to make the elongated slots are quartz sand or ceramic grains;
the consolidation strength of precoated sand used for manufacturing the wide seam is more than 4MPa, and the permeability is more than 2D.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109488271A (en) * | 2018-09-20 | 2019-03-19 | 中国石油天然气股份有限公司 | Design method for annular space layered fracturing of sand-blasting perforation of continuous oil pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6431278B1 (en) * | 2000-10-05 | 2002-08-13 | Schlumberger Technology Corporation | Reducing sand production from a well formation |
| EP2469020A1 (en) * | 2010-12-23 | 2012-06-27 | Claude Vercaemer | Process of hydraulic fracturing to create a layered proppant pack structure alongside the faces of the fracture to prevent formation fines to damage fracture conductivity |
| CN105275446B (en) * | 2014-06-30 | 2018-03-30 | 中国石油化工股份有限公司 | A kind of volume fracturing remodeling method |
| CN107461182B (en) * | 2017-09-08 | 2019-08-06 | 中国石油天然气股份有限公司 | Layered fracturing sand prevention method |
| CN110344807A (en) * | 2018-04-02 | 2019-10-18 | 中国石油化工股份有限公司 | Improve the fracturing process of the comprehensive sand ratio of Low permeable oil and gas reservoirs pressure break |
| CN111594100B (en) * | 2020-03-18 | 2021-07-20 | 中国石油大学(华东) | Sand prevention and yield increase method for unconsolidated sandstone oil and gas reservoir and application of sand prevention and yield increase method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109488271A (en) * | 2018-09-20 | 2019-03-19 | 中国石油天然气股份有限公司 | Design method for annular space layered fracturing of sand-blasting perforation of continuous oil pipe |
Non-Patent Citations (1)
| Title |
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| 何生厚 等.《油气开采工程》.北京：中国石化出版社,2003,(第1版),第479-483页. * |
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