CN104564004A - Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method - Google Patents

Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method Download PDF

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Publication number
CN104564004A
CN104564004A CN201410833263.0A CN201410833263A CN104564004A CN 104564004 A CN104564004 A CN 104564004A CN 201410833263 A CN201410833263 A CN 201410833263A CN 104564004 A CN104564004 A CN 104564004A
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CN
China
Prior art keywords
well
oil
spacing
well spacing
array
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
CN201410833263.0A
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Chinese (zh)
Inventor
兰中孝
张有才
金岩松
兰乘宇
汪玉梅
杨光
杨玉才
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.)
Petrochina Co Ltd
Daqing Oilfield Co Ltd
China Petroleum and Natural Gas Co Ltd
Original Assignee
Daqing Oilfield Co Ltd
China Petroleum and Natural Gas Co Ltd
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Publication date
Application filed by Daqing Oilfield Co Ltd, China Petroleum and Natural Gas Co Ltd filed Critical Daqing Oilfield Co Ltd
Priority to CN201410833263.0A priority Critical patent/CN104564004A/en
Publication of CN104564004A publication Critical patent/CN104564004A/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
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures
    • 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
    • E21B43/30Specific pattern of wells, e.g. optimizing the spacing of wells

Abstract

The invention discloses a dense sandstone-shale reservoir stratum crack net fracturing development well spacing method, and aims at solving problems that since well spacing is carried out by mainly adopting regulated inverted nine-spot and rectangular well net manners and the like in China, the well net density is great and the yield of a single well is low. The dense sandstone-shale reservoir stratum crack net fracturing development well spacing method particularly comprises the following steps of carrying out the well spacing in a well arraying direction according to a maximum main stress direction of a stratum; determining a crack net range and an oil well space according to a sand body development scale; determining an injection-production arraying distance and the oil well distance according to corresponding formulas on the basis of the difference of a water injection manner and a non-water-injection manner; and finally, carrying out a development and production manner of crack net fracturing on all the oil wells. With the adoption of the well spacing method, the well net density is obviously reduced, so that the well drilling cost is greatly saved and the low-cost and efficient development aim is finally realized.

Description

Fine and close sand mud reservoir seam net fracturing developing well-arranging procedure
Technical field
The present invention relates to a kind of fracturing developing well-arranging procedure, particularly for the well-arranging procedure of fine and close sand mud reservoir, employing seam net fracturing developing.
Background technology
Horizontal well volume fracturing is mainly adopted to develop to fine and close sand mud reservoir abroad at present, and establish the well-arranging procedure utilizing horizontal well volume fracturing to develop, and domestic straight well multiple dense sand mud reservoir adopts seam net fracturing developing, the well-arranging procedure of horizontal well volume fracturing exploitation is not suitable for seam net fracturing developing.Therefore, domesticly mainly take the mode well spacing such as anti-and the rectangular pattern of rule at 9, because well spacing density is large, single well productivity is low, causes fine and close sand shale reserves cannot obtain economical and effective and uses.
Summary of the invention
The object of this invention is to provide a kind of fine and close sand mud reservoir seam net fracturing developing well-arranging procedure, use the method well spacing, well spacing density is low, and economic benefit is improved significantly.
For achieving the above object, the technical solution used in the present invention is: a kind of fine and close sand mud reservoir seam net fracturing developing well-arranging procedure, is divided into two kinds of situations, particularly:
1, under water filling condition:
(1), the design in well array direction: well array direction is by stratum biggest principal stress direction well spacing;
The man-made fracture direction produced due to pressure break is always parallel to rock biggest principal stress direction, and therefore well array by biggest principal stress direction well spacing, must meet the demand of later stage fracturing reform; Wherein the determination of biggest principal stress direction can analyze each diversity of rock according to XMAC well logging or acoustic-electric imaging logging, and last solution disengages the biggest principal stress direction of rock;
(2), the design of oil well spacing: by the scale of sand body growth, determine seam net scope, further by following table determination oil well spacing:
(3), note adopts the design of array pitch: the limit note first obtained under given injection production pressure difference and reservoir permeability condition according to following formula adopts array pitch:
In formula: p h -static reservoir pressure, MPa;
p w -flowing bottomhole pressure (FBHP), MPa;
r-limit note adopts array pitch, m;
r w -wellbore radius, m;
λ-free-boundary problem, MPa/m;
Determine that final Reasonable Injection adopts array pitch according to following formula again:
R 1 RL 2 ÷2
In formula: r 1 -note adopts array pitch, m;
r-limit note adopts array pitch, m;
l 2 -seam net width, m;
(4) mode is developed and operated: oil well all carries out seam net pressure break, and well carries out conventional pressure break;
2, under not water filling condition:
(1) well array direction is identical with the method for designing of oil well spacing with well array direction under water filling condition with the method for designing of oil well spacing; Owing to not considering water filling in oil reservoir inside, therefore need not consider that note adopts array pitch;
(2) design of oil-well drainage distance: determine according to the following equation:
R 0 =L 2
In formula: r 0 -oil-well drainage distance, m;
l 2 -seam net width, m;
(3) mode is developed and operated: oil well all carries out seam net pressure break.
Beneficial effect of the present invention: stitch in comparative example net pressure break water filling or not under waterflooding extraction condition under hole pattern and conventional pressure break waterflooding extraction condition hole pattern can find out, the well spacing density of the inventive method well spacing is adopted obviously to diminish, thus greatly save drilling cost 46.2%, realize the object of low-cost high-efficiency exploitation.
Accompanying drawing explanation
Fig. 1 is the former hole pattern schematic diagram of state 602-4 block.
Fig. 2 adopts hole pattern schematic diagram of the present invention under state 602-4 block considers water filling condition.
Fig. 3 is the former hole pattern schematic diagram of state 602-7 block.
Fig. 4 adopts hole pattern schematic diagram of the present invention under state 602-7 block does not consider water filling condition.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described further:
embodiment 1: 602-4 wellblock, state adopts fine and close sand mud reservoir to stitch net fracturing developing well-arranging procedure
This block sand body grows FY oil-layer, and main layer is FI1-7 layer, and in plane, sand body is grown scattered, poor continuity.By original rectangular pattern waterflooding extraction mode well spacing, as shown in Figure 1, then press 300m × 100m well pattern well spacing, need drilling well 26 mouthfuls of wells altogether.
Adopt fine and close sand mud reservoir to stitch net fracturing developing well-arranging procedure, be implemented as follows:
1, the design in well array direction:
Determine that the biggest principal stress direction of rock is east northeast 110 degree according to electric imaging logging analysis, therefore well array direction is arranged by this angle.
2, the design of oil well spacing:
Individual well seam net control range 400m × 200m, apart from being between 400 ~ 450m, is finally defined as 425m by planned well in table.
3, note adopts the design of array pitch:
According to this block formation parameter, calculating theoretical limit note, to adopt array pitch be 60m, and seam net width is 200m, therefore adopts array pitch=60+(200 ÷ 2 according to formula design note)=160m.
4, all oil wells all adopt seam net fracturing technology to go into operation, and well adopts conventional fracturing technology to go into operation.
Well spacing in a manner described, the whole district only needs drilling well 14 mouthfuls, specifically as shown in Figure 2.Final saving drilling cost 46.2%, realizes low-cost high-efficiency exploitation.
embodiment 2: 602-7 wellblock, state adopts fine and close sand mud reservoir to stitch net fracturing developing well-arranging procedure
This block sand body grows FY oil-layer, and main layer is FI1-7 layer, and in plane, sand body is grown scattered, poor continuity.By original rectangular pattern waterflooding extraction mode well spacing, as shown in Figure 3, then press 300m × 100m well pattern well spacing, need drilling well 14 mouthfuls of wells altogether.Adopt fine and close sand mud reservoir to stitch net fracturing developing well-arranging procedure, be implemented as follows:
1, the design in well array direction:
First determine that the biggest principal stress direction of rock is east northeast 90 degree according to electric imaging logging analysis, therefore well array direction is arranged by this angle.
2, the design of oil well spacing:
Individual well seam net control range 400m × 200m, designs between 400 ~ 450m by table, is finally defined as 425m.
3, the design of oil-well drainage distance:
Because design seam net width is 200m, therefore well array is apart from identical with seam net width, adopts 200m array pitch.
4, all oil wells all adopt seam net fracturing technology.
Well spacing in a manner described, the whole district only needs drilling well 5 mouthfuls, specifically as shown in Figure 4, saves drilling cost 64.3%, realizes low-cost high-efficiency exploitation.

Claims (1)

1. a fine and close sand mud reservoir seam net fracturing developing well-arranging procedure, is divided into two kinds of situations, particularly:
1, under water filling condition:
(1), the design in well array direction: well array direction is by stratum biggest principal stress direction well spacing;
(2), the design of oil well spacing: by the scale of sand body growth, determine seam net scope, further by following table determination oil well spacing:
(3), note adopts the design of array pitch: the limit note first obtained under given injection production pressure difference and reservoir permeability condition according to following formula adopts array pitch:
In formula: p h -static reservoir pressure, MPa;
p w -flowing bottomhole pressure (FBHP), MPa;
r-limit note adopts array pitch, m;
r w -wellbore radius, m;
λ-free-boundary problem, MPa/m;
Determine that final Reasonable Injection adopts array pitch according to following formula again:
R 1 RL 2 ÷2
In formula: r 1 -note adopts array pitch, m;
r-limit note adopts array pitch, m;
l 2 -seam net width, m;
(4) mode is developed and operated: oil well all carries out seam net pressure break, and well carries out conventional pressure break;
2, under not water filling condition:
(1) well array direction is identical with the method for designing of oil well spacing with well array direction under water filling condition with the method for designing of oil well spacing;
(2) design of oil-well drainage distance: determine according to the following equation:
R 0 =L 2
In formula: r 0 -oil-well drainage distance, m;
l 2 -seam net width, m;
(3) mode is developed and operated: oil well all carries out seam net pressure break.
CN201410833263.0A 2014-12-30 2014-12-30 Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method Pending CN104564004A (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410833263.0A CN104564004A (en) 2014-12-30 2014-12-30 Dense sandstone-shale reservoir stratum crack net fracturing development well spacing method

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CN104564004A true CN104564004A (en) 2015-04-29

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106321056A (en) * 2015-06-17 2017-01-11 中国石油化工股份有限公司 A well arranging method for well factories
CN106639996A (en) * 2016-11-23 2017-05-10 中国石油天然气股份有限公司 Method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding
CN111022012A (en) * 2019-11-18 2020-04-17 中国石油天然气股份有限公司 Dense oil steam flooding steam temperature design method

Citations (4)

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Publication number Priority date Publication date Assignee Title
US4685519A (en) * 1985-05-02 1987-08-11 Mobil Oil Corporation Hydraulic fracturing and gravel packing method employing special sand control technique
US20090288825A1 (en) * 2006-03-15 2009-11-26 Chemeor, Inc. Surfactant method for improved oil recovery from subterranean reservoirs
CN102071922A (en) * 2011-01-15 2011-05-25 胜利油田鲁明油气勘探开发有限公司 Low permeable oil deposit virtual horizontal well development method
CN104141481A (en) * 2013-05-06 2014-11-12 中国石油天然气股份有限公司 Well spacing method of ultralow-permeability tight-oil reservoir horizontal well

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685519A (en) * 1985-05-02 1987-08-11 Mobil Oil Corporation Hydraulic fracturing and gravel packing method employing special sand control technique
US20090288825A1 (en) * 2006-03-15 2009-11-26 Chemeor, Inc. Surfactant method for improved oil recovery from subterranean reservoirs
CN102071922A (en) * 2011-01-15 2011-05-25 胜利油田鲁明油气勘探开发有限公司 Low permeable oil deposit virtual horizontal well development method
CN104141481A (en) * 2013-05-06 2014-11-12 中国石油天然气股份有限公司 Well spacing method of ultralow-permeability tight-oil reservoir horizontal well

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王芳: "低渗油藏多井型井网优化设计研究", 《中国优秀硕士学位论文全文库工程科技I辑》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106321056A (en) * 2015-06-17 2017-01-11 中国石油化工股份有限公司 A well arranging method for well factories
CN106639996A (en) * 2016-11-23 2017-05-10 中国石油天然气股份有限公司 Method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding
CN106639996B (en) * 2016-11-23 2019-06-11 中国石油天然气股份有限公司 The method of straight well volume fracturing and linear water filling combination and exploitation extra-low-permeability reservoir
CN111022012A (en) * 2019-11-18 2020-04-17 中国石油天然气股份有限公司 Dense oil steam flooding steam temperature design method

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Application publication date: 20150429