CN110984917A - Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir - Google Patents

Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir Download PDF

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Publication number
CN110984917A
CN110984917A CN201911116926.6A CN201911116926A CN110984917A CN 110984917 A CN110984917 A CN 110984917A CN 201911116926 A CN201911116926 A CN 201911116926A CN 110984917 A CN110984917 A CN 110984917A
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CN
China
Prior art keywords
low
reservoir
permeability
borehole
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911116926.6A
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Chinese (zh)
Inventor
宋立志
吴绍伟
袁辉
万小进
周泓宇
何长林
梁玉凯
彭建峰
程利民
谢思宇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Offshore Oil Corp CNOOC
China National Offshore Oil Corp Zhanjiang Branch
Original Assignee
China National Offshore Oil Corp CNOOC
China National Offshore Oil Corp Zhanjiang Branch
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Filing date
Publication date
Application filed by China National Offshore Oil Corp CNOOC, China National Offshore Oil Corp Zhanjiang Branch filed Critical China National Offshore Oil Corp CNOOC
Priority to CN201911116926.6A priority Critical patent/CN110984917A/en
Publication of CN110984917A publication Critical patent/CN110984917A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/08Screens or liners
    • E21B43/086Screens with preformed openings, e.g. slotted liners

Abstract

The invention discloses a production-increasing, water-controlling and sand-preventing well completion method for a hypotonic reservoir, which comprises the following steps: selecting a low-permeability oil field to be developed; establishing a construction well, and drilling a main underground flowing well hole; setting a casing into the main borehole, and cementing the borehole wall and the casing annulus by using cement; forming a plurality of branch boreholes by using a multi-branch drilling technology; arranging a sand control screen pipe with an inflow control device in the reservoir section of the main well; filling ceramsite with low density, cementation and hydrophobic functions; the method can increase the oil drainage area of the low-permeability reservoir, provide a seepage and flow guide advantageous flow passage, and the sand control screen pipe with the inflow control device has the functions of sand control and water control, can increase the production pressure difference of the low-permeability reservoir and improve the utilization degree of the low-permeability reservoir, so that the method for increasing the yield and controlling the water of the low-permeability reservoir on the sea can realize the efficient and economic development of the low-permeability reservoir.

Description

Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a production-increasing water-controlling sand-preventing well completion method for a hypotonic reservoir.
Background
In recent years, the dependence of domestic crude oil on the outside is high, an oil reservoir with the permeability between 0.1 millidarcy and 50 millidarcy is defined as a low-permeability oil reservoir internationally, the low-permeability oil reservoir does not use high reserve, the productivity is improved by reservoir transformation mostly in the past, series of technologies such as high-hole density perforation, integral fracturing transformation and the like are formed, partial results are obtained, the development effect of the low-permeability oil reservoir is improved to a certain extent through a flow channel formed by perforation or fracturing, but the integral drainage area is still required to be further improved, and the space for increasing the yield is provided.
In addition, the contradiction exposed in the development of the low-permeability reservoir will gradually appear in the condition that the main-force low-permeability reservoir development unit enters the medium-high water-cut period and is accompanied with the phenomena of high water cut and sand production, and the conventional well completion method generally adopts a common sand control screen pipe or gravel pack to perform sand control without considering water control or considering the integrated process of water control and sand control.
Aiming at the problems existing in the development of the low-permeability reservoir at present, higher requirements are put forward on an early well completion method of the low-permeability reservoir, and a well completion scheme which is matched with sand prevention and water control measures and is required to be further formed while the productivity of the low-permeability reservoir is improved is urgently needed.
Disclosure of Invention
The invention aims to provide a production-increasing water-controlling sand-controlling well completion method for a low-permeability reservoir, which can improve the productivity of the low-permeability reservoir and simultaneously form a well completion scheme matched with sand-controlling and water-controlling matching measures.
In order to solve the above problems, the present invention provides a production and water control sand control completion method for a hypotonic reservoir, comprising the steps of:
s1, selecting an offshore low-permeability oil field to be developed, and selecting a reservoir stratum with the permeability of 0.1 millidarcy to 50 millidarcy from the oil field;
s2, establishing a construction well, and drilling a main borehole for the underground fluid to flow through a drilling ship;
s3, arranging a casing on the main borehole, and cementing the borehole wall and the casing by using cement in the annular space;
s4, drilling a fishbone-shaped underground branch well hole by adopting a multi-branch drilling or jetting technology, and enlarging the drainage area of a low-permeability reservoir;
s5, arranging a sand control screen pipe with an inflow control device in a reservoir section of a main well bore, wherein the inflow control device is a nozzle type or flow channel type device with a function of balancing a fluid production profile of a well bore, the inflow control device is arranged on the sand control screen pipe and is arranged at the reservoir section of the main well bore together, and the sand control screen pipe with the inflow control device adopts a nozzle inflow control screen pipe of Ruifeng Petroleum engineering development, Limited liability company;
and S6, filling ceramsite with low density, cementation and hydrophobic functions from the main well hole, wherein the ceramsite can flow to the main well hole and the branch well hole along with filling liquid, and the formed cementing body can play roles in stabilizing the well wall, preventing sand, dewatering and the like.
Further, the main hole size in step S2 is 244mm or more.
Further, in step S4, the number of branch boreholes is 50m or more in length, the span between the branch boreholes is 20m or more, and the size of the branch boreholes is 100mm or more, thereby increasing the reservoir exploitation level and the flow area.
Compared with the prior art:
the method of the invention widens the yield increase mode of the developed low permeability reservoir stratum or the low permeability reservoir stratum to be developed at sea, greatly increases the productivity of the low permeability reservoir stratum, and simultaneously adopts the integrated method of yield increase, water control and sand control to realize the measures of yield increase, sand control and water control of the low permeability reservoir stratum during the well completion period, thereby not only effectively developing the low permeability reservoir stratum, but also reducing the risk and cost of adopting the measures of water control in the middle and later periods of development, and improving the economic benefit of the development of the low permeability reservoir stratum at sea.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of a well completion method of the present invention;
in the figure: 1-a main wellbore; 2-a sleeve; 3-branch wellbore; 4-sand control screen pipe; 5-an inflow control device; 6-ceramsite.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method of stimulation water control sand control completion for a hypotonic reservoir, the method comprising the steps of:
and step S1, selecting an offshore low-permeability oil field to be developed, and selecting a reservoir stratum with the permeability of 0.1 millidarcy to 50 millidarcy from the oil field.
And step S2, establishing a construction well, and drilling a main borehole 1 for flowing underground fluid through a drilling ship, wherein the size of the main borehole 1 is more than 244 mm.
Step S3, the main borehole 1 is provided with a casing 2, and cement is used for cementing on the annular space between the borehole wall and the casing 2.
Step S4, drilling an underground branch well 3 by adopting a multi-branch drilling or jetting technology, wherein the shape of the underground branch well is a fishbone type, and the drainage area of a low-permeability reservoir is enlarged; the branch well bores 3 are multiple and have a length of 50m or more, a span between the branch well bores 3 is 20m or more, and the size of the branch well bore 3 is 100mm or more, so that the reservoir exploitation degree and the flow area are increased.
Step S5, arranging a sand control screen pipe 4 with an inflow control device 5 on the reservoir section of the main well 1, wherein the inflow control device 5 is a nozzle type or flow passage type device with the function of balancing the fluid production profile of the shaft, and the inflow control device 5 is arranged on the sand control screen pipe 4 and is arranged at the reservoir section position of the main well 1; the sand control screen 4 with inflow control device 5 is a nozzle inflow control screen of ruifeng oil technologies development, llc.
And step S6, filling ceramsite 6 with low density, cementation and dewatering functions from the main well 1, wherein the ceramsite 6 can flow to the main well 1 and the branch well 3 along with filling liquid, and the formed cementing body can play roles in stabilizing the well wall, preventing sand, dewatering and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (3)

1. A production and water control sand control completion method for a hypotonic reservoir is characterized by comprising the following steps:
s1, selecting an offshore low-permeability oil field to be developed, and selecting a reservoir stratum with the permeability of 0.1 millidarcy to 50 millidarcy from the oil field;
s2, establishing a construction well, and drilling a main borehole (1) for flowing downhole fluid through a drilling ship;
s3, arranging a casing (2) in the main borehole (1), and cementing the borehole wall and the annulus of the casing (2) by cement;
s4, drilling a downhole lateral borehole (3) by adopting a multi-lateral drilling or jetting technology;
s5, arranging a sand control screen pipe (4) with an inflow control device (5) in the reservoir section of the main borehole (1), wherein the inflow control device (5) is a nozzle type or flow channel type device with the function of balancing the fluid production profile of the borehole, and the inflow control device (5) is arranged on the sand control screen pipe (4) and is arranged at the reservoir section position of the main borehole (1) together;
and S6, filling ceramsite (6) with low density, cementation and hydrophobic functions from the main borehole (1).
2. A stimulation and water control sand control completion method for a hypotonic reservoir according to claim 1, characterized in that said main wellbore (1) size in step S2 is 244mm or more.
3. A stimulation and water control sand control completion method for a hypotonic reservoir according to claim 2, characterized in that said branched well bores (3) in step S4 are multiple and have a length of 50m or more, the span between the branched well bores (3) is 20m or more, and the size of the branched well bores (3) is 100mm or more.
CN201911116926.6A 2019-11-15 2019-11-15 Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir Pending CN110984917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201911116926.6A CN110984917A (en) 2019-11-15 2019-11-15 Production-increasing water-controlling sand-preventing well completion method for low-permeability reservoir

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CN111794721A (en) * 2020-08-14 2020-10-20 西南石油大学 Horizontal well production increasing method based on chemical sand filling of multi-branch slim hole
CN113309460A (en) * 2021-05-18 2021-08-27 中国地质大学(武汉) Oil-gas well fracturing filling well reconstruction drilling method and device

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CN111794721A (en) * 2020-08-14 2020-10-20 西南石油大学 Horizontal well production increasing method based on chemical sand filling of multi-branch slim hole
CN113309460A (en) * 2021-05-18 2021-08-27 中国地质大学(武汉) Oil-gas well fracturing filling well reconstruction drilling method and device

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Application publication date: 20200410