CN104695862B - Drilling geology design method for tight sandstone lithology gas reservoir horizontal well - Google Patents
Drilling geology design method for tight sandstone lithology gas reservoir horizontal well Download PDFInfo
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- 238000013461 design Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005553 drilling Methods 0.000 title claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 34
- 238000004458 analytical method Methods 0.000 claims abstract description 8
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 238000010276 construction Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 241000269793 Cryothenia peninsulae Species 0.000 claims description 2
- 208000035126 Facies Diseases 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 35
- 238000011161 development Methods 0.000 abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 3
- 239000003345 natural gas Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 2
- 238000012512 characterization method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003102 growth factor Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions
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Abstract
A drilling geology design method for a tight sandstone lithology gas reservoir horizontal well belongs to the technical field of natural gas development. Geological reservoir data are collected, and a seismic profile map, a sand body thickness map, an effective reservoir thickness map, a structural map, a gas reservoir profile map and a track schematic map of a horizontal well deployment area are compiled through the technical steps of fine description of the geological reservoir data and seismic gas content prediction, so that quantitative characterization of reservoir space distribution is realized, a horizontal well track target point is determined in an optimized mode, a horizontal section target point design table of the horizontal well is given, and a basis is provided for implementation of the horizontal well. The method overcomes the defect of low precision of the conventional geological analysis method, overcomes the defects of complexity and high difficulty of an oil-gas reservoir numerical simulation method, has the characteristic of simple and convenient operation, and ensures that the sandstone drilling rate of the drilled horizontal well reaches over 75 percent and the effective reservoir drilling rate reaches over 55 percent.
Description
Technical field
The present invention relates to a kind of tight sand lithologic gas reservoirs horizontal well drilling geological design method, belong to construction of natural gas fields skill
Art field.
Background technology
Compact sandstone gas are the main growth factor of the current gas production of China.The master of compact sandstone gas economic scale exploitation
One of means are wanted to be exactly to adopt horizontal well development technology.Horizontal well drilling geological design is that horizontal well development is the most basic most important
One work, it mainly solves the horizontal segment of the horizontal well track in oil-gas Layer, including before Horizontal Well Targets away from, orientation, length,
Enter target depth and horizontal segment each target spot lengthwise position in oil-gas Layer.At present, the method for horizontal well design mainly has two kinds: a kind of
It is conventional geology analytic process, is mainly used in that reservoir development is stable, simply constructed oil-gas reservoir, this method is fairly simple, but
Restricted application, for well control low degree, longitudinal multilamellar, cross directional variations are fast, reservoir is strong DAMAGE OF TIGHT SAND GAS RESERVOIRS,
Design accuracy cannot meet horizontal well development and require.Another method is numerical simulation for oil-gas reservoir method, and this method is first
Set up horizontal well deployment area three-dimensional geological model using various data, then use Method for Numerical correction geological model, and
Whole optimization design horizontal well path, this method intuitive display, high precision, it is suitable for mid-later development phase oil-gas reservoir tap production potential,
But labor intensive, material resources are many, it is also not suitable for the DAMAGE OF TIGHT SAND GAS RESERVOIRS strong for building product initial stage well control low degree, anisotropism.Cause
This, above two method, when for DAMAGE OF TIGHT SAND GAS RESERVOIRS, has each professional difficult point and limitation.Domestic there is no pin
Maturation method to DAMAGE OF TIGHT SAND GAS RESERVOIRS horizontal well drilling geological design.
Content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of tight sand lithologic gas reservoirs horizontal well drilling geology to set
Meter method.
A kind of tight sand lithologic gas reservoirs horizontal well drilling geological design method, containing following steps；
Collect geologic reservoir data, by geology reservoir data fine description and earthquake gas distribution prediction technical step,
Compiling level well deployment area seismic cross-section, sand thickness figure, Effective Reservoirs thickness chart, structural map, gas reservoir profile, track show
Being intended to, realize being distributed quantitatively characterizing to reservoir space, thus optimizing determination horizontal well path target spot, providing horizontal well horizontal segment target
Point design table, the enforcement for horizontal well provides foundation.
Contain and have the following steps:
Step 1), the geology characteristic according to Sandstone Gas Reservoir, choose offset well reference lamina, carry out Strata Comparison division.
Described Strata Comparison is to determine that horizontal well implements mesh using cycle contrast, thickness contrast, lithology combination matching type
Layer.
Step 2), according to stratum comparing result, extract target zone stratum, sand body, Effective Reservoirs, construction data.
Step 3), utilize seismic data, in conjunction with well point geologic information, contain with common seismic section, inverting section and avo
Gas predicts section, and comprehensive analysis target zone lineups reflect feature, determines target zone reservoir horizontal stroke, genesis analysis scope and construction
Variation tendency, provides foundation for horizontal well path orientation, Design of length.
Step 4), using facies control analysis method and equivalent interpolation, using the formation data extracting, sand body data, significant figure
According to, construction data, compiling level well disposes the structural contour map of area target zone, sand thickness isogram, effective thickness etc.
Value line chart and gas reservoir profile；
Described structural contour map reflection is target zone top, bottom fluctuating quantity size；Sand body, effective thickness contour
Figure reflection target zone plane distributing scope；Gas reservoir profile longitudinally reflects rock target zone inner structural features and change；
Step 5), comprehensive seismic cross-section, structural contour map, sand thickness isogram, effective thickness isogram,
Gas reservoir profile describes result to target zone, quantitative compiling level well track schematic diagram；
Described quantitative compiling level well track schematic diagram should include following quantizating index；
(1) target zone horizontal segment sand thickness is more than 6m；
(2) target zone horizontal segment net sandstone thickness is more than 4m；
(3) horizontal well pithead position target zone top, bottom height above sea level depth, error is less than 3m；
(4) horizontal well enters target position target zone top, bottom height above sea level depth, and error is less than 3m；
(5) horizontal well bottom hole location target zone top, bottom height above sea level depth, error is less than 3m；
(6) horizontal well prolongs horizontal segment directional structure vectorical structure highest position target zone top, bottom height above sea level depth, and error is less than 3m；
(7) horizontal well prolongs horizontal segment directional structure vectorical structure minimum position target zone top, bottom height above sea level depth, and error is less than 3m；
(8) horizontal well trajectory of horizontal each target spot height above sea level depth, error is less than 3m；
Step 6), based on the schematic diagram of track, design level well track, work out shot design parameter list；
Described design level well track refers to, on the basis of the distribution of quantitatively characterizing reservoir space and internal feature, design rail
Mark is located in the middle part of Effective Reservoirs, optimizes type of gesture according to Reservoir type；Shot design parameter list refers to provide clear and definite track
Target spot height above sea level depth and coordinate；
Step 7), comprehensive above job step result, write the report of horizontal well drilling geological design according to specification.
The invention has the beneficial effects as follows:
The present invention is directed to tight sand strong heterogeneous body lithologic gas reservoirs horizontal well development, provides a kind of horizontal well of practical convenient
Drilling geology method for designing.Both overcome the not high shortcoming of conventional geology analytic process precision, and avoid numerical simulation for oil-gas reservoir method numerous again
The big deficiency of trivial, difficulty, the method has the characteristics that easy and simple to handle it is ensured that the sandstone Drilling ratio of finishing drilling horizontal well reaches 75%
More than, Effective Reservoirs Drilling ratio more than 55%.
Brief description
When considered in conjunction with the accompanying drawings, by referring to detailed description below, can more completely more fully understand the present invention with
And easily learn the adjoint advantage of many of which, but accompanying drawing described herein is used for providing a further understanding of the present invention,
Constitute the part of the present invention, the schematic description and description of the present invention is used for explaining the present invention, does not constitute to this
Bright improper restriction, wherein:
Fig. 1 is the schematic flow sheet of the present invention.
The present invention is further described with reference to the accompanying drawings and examples.
Specific embodiment
Obviously, those skilled in the art belong to the guarantor of the present invention based on the many modifications and variations that spirit of the invention is done
Shield scope.
Embodiment 1: as shown in figure 1,
A kind of tight sand lithologic gas reservoirs horizontal well drilling geological design method, is collection geologic reservoir fine description and earthquake
Horizontal well drilling geological design method that gas distribution prediction technology is integrated is it is adaptable to strong heterogeneous body tight sand lithologic gas reservoirs.
Flow process described in Fig. 1 is that tight sand horizontal well geological design geology first will carry out stratum in horizontal well targets area
Contrast divides, and arranges mapping data, establishment construction, sand thickness, effective thickness and gas reservoir profile according to comparing result；Earthquake
With gas distribution prediction as core, in conjunction with geo-logical terrain comparing result, demarcate target zone and determine horizontal well profile position, prediction storage
Layer distribution mode.Result is described by geology, earthquake synthesis target zone, quantitative compiling level well track schematic diagram, according to track
Shot design table write by schematic diagram, completes horizontal well drilling geological design.
Such as horizontal well " flat 1 well ":
Firstth, Strata Comparison is carried out to neighbouring drilled well, determine p2x8Implement target zone for flat 1 well；
Secondth, extract p2x8The stratum of target zone, sand body, Effective Reservoirs, construction data, wherein sand thickness 8m, effectively store up
Thickness degree 5m, is all higher than horizontal well path design quantization minimum and requires thickness；
3rd, seismic data comprehensive analysis target zone lineups are utilized to be favourable reflection feature, reservoir cross direction profiles scope
Greatly, beneficial direction is positive north orientation, determines that horizontal well orientation is 0 degree, length 1000m；
4th, using extraction p2x8Target zone sand body, Effective Reservoirs, construction data organization target zone structural contour map,
Sand thickness isogram, effective thickness isogram and gas reservoir profile；
5th, combine various maps to target zone comprehensive description, determine " flat 1 well " well head, enter target spot and bottom hole location sand
Body, effective, construction high and low position depth, establishment " flat 1 well " track schematic diagram；
6th, based on the schematic diagram of track, design level well track is straight down type, every 200 meters of target spots, respectively
Shot design height above sea level depth is -1650m, -1651m, -1652m, -1653m, -1654m, -1655m；
7th, comprehensive above step, writes and completes " flat 1 well " horizontal well drilling geological design report, guide field level
Well construction.
As described above, being explained to embodiments of the invention, but as long as essentially without depart from this
Bright inventive point and effect can have a lot of deformation, and this will be readily apparent to persons skilled in the art.Therefore, this
The variation of sample is also integrally incorporated within protection scope of the present invention.
Claims (1)
1. a kind of tight sand lithologic gas reservoirs horizontal well drilling geological design method is it is characterised in that contain following steps；Collection
Geologic reservoir data, by geology reservoir data fine description and earthquake gas distribution prediction technical step, compiling level well portion
Administration's area's seismic cross-section, sand thickness figure, Effective Reservoirs thickness chart, structural map, gas reservoir profile, track schematic diagram, it is right to realize
Reservoir space is distributed quantitatively characterizing, thus optimizing determination horizontal well path target spot, providing horizontal well horizontal segment shot design table, being
The enforcement of horizontal well provides foundation,
Contain and have the following steps:
Step 1), according to the geology characteristic of Sandstone Gas Reservoir, choose offset well reference lamina, carry out Strata Comparison division；
Described Strata Comparison is to determine that horizontal well implements target zone using cycle contrast, thickness contrast, lithology combination matching type；
Step 2), according to stratum comparing result, extract target zone stratum, sand body, Effective Reservoirs, construction data；
Step 3), utilize seismic data, in conjunction with well point geologic information, with common seismic section, inverting section and avo gas-bearing property
Prediction section, comprehensive analysis target zone lineups reflect feature, determine target zone reservoir horizontal stroke, genesis analysis scope and construction change
Trend, provides foundation for horizontal well path orientation, Design of length；
Step 4), using facies control analysis method and equivalent interpolation, using the formation data extracting, sand body data, valid data, structure
Make data, the structural contour map of compiling level well deployment area target zone, sand thickness isogram, effective thickness isogram
And gas reservoir profile；
Described structural contour map reflection is target zone top, bottom fluctuating quantity size；Sand body, effective thickness isogram are anti-
Reflect target zone plane distributing scope；Gas reservoir profile longitudinally reflects rock target zone inner structural features and change；
Step 5), comprehensive seismic cross-section, structural contour map, sand thickness isogram, effective thickness isogram, gas reservoir
Profile describes result to target zone, quantitative compiling level well track schematic diagram；
Described quantitative compiling level well track schematic diagram should include following quantizating index；
(1) target zone horizontal segment sand thickness is more than 6m；
(2) target zone horizontal segment net sandstone thickness is more than 4m；
(3) horizontal well pithead position target zone top, bottom height above sea level depth, error is less than 3m；
(4) horizontal well enters target position target zone top, bottom height above sea level depth, and error is less than 3m；
(5) horizontal well bottom hole location target zone top, bottom height above sea level depth, error is less than 3m；
(6) horizontal well prolongs horizontal segment directional structure vectorical structure highest position target zone top, bottom height above sea level depth, and error is less than 3m；
(7) horizontal well prolongs horizontal segment directional structure vectorical structure minimum position target zone top, bottom height above sea level depth, and error is less than 3m；
(8) horizontal well trajectory of horizontal each target spot height above sea level depth, error is less than 3m；
Step 6), based on the schematic diagram of track, design level well track, work out shot design parameter list；
Described design level well track refers on the basis of the distribution of quantitatively characterizing reservoir space and internal feature, planned course position
In the middle part of Effective Reservoirs, type of gesture is optimized according to Reservoir type；Shot design parameter list refers to provide clear and definite track target spot
Height above sea level depth and coordinate；
Step 7), comprehensive above job step result, write horizontal well drilling geological design according to specification and report.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105298388A (en) * | 2015-10-30 | 2016-02-03 | 中国石油天然气集团公司 | Horizontal well drilling path guiding method and device |
| CN105735978B (en) * | 2016-02-19 | 2018-12-04 | 中国石油集团川庆钻探工程有限公司 | Well spacing method for carbonate interlayer karst reservoir |
| CN107676084A (en) * | 2017-08-17 | 2018-02-09 | 中国石油天然气股份有限公司 | Dense oil reservoir long horizontal section track design method |
| CN108518181B (en) * | 2017-12-14 | 2019-06-18 | 中国石油化工股份有限公司华北油气分公司勘探开发研究院 | A kind of DAMAGE OF TIGHT SAND GAS RESERVOIRS horizontal well path dynamic adjusting method |
| CN108756745A (en) * | 2018-04-28 | 2018-11-06 | 中国石油天然气股份有限公司 | Drilling method for platform cluster well |
| CN109960897A (en) * | 2019-04-24 | 2019-07-02 | 中国石油大港油田勘探开发研究院 | A kind of shale oil horizontal well path design and live tracking adjustment research method |
| CN110424945B (en) * | 2019-08-01 | 2022-12-13 | 中国石油天然气股份有限公司大港油田分公司 | Shale oil horizontal well deployment method and device |
| CN111832166B (en) * | 2020-07-06 | 2023-11-03 | 中海石油(中国)有限公司 | Method and system for modeling fine structure of coal seam of horizontal well without guide hole |
| CN112377104B (en) * | 2020-10-30 | 2023-04-07 | 中国石油天然气集团有限公司 | Method and device for dynamically adjusting actual drilling track of tight sandstone gas reservoir horizontal well |
| CN112523744A (en) * | 2020-11-30 | 2021-03-19 | 大庆油田有限责任公司 | Well position design and real-time tracking and guiding method for thin-difference horizontal well |
| CN114810047B (en) * | 2021-01-22 | 2025-02-25 | 中国石油天然气股份有限公司 | Method, device, equipment and storage medium for determining wellbore trajectory in oil reservoir |
| CN113221219B (en) * | 2021-05-08 | 2023-09-01 | 北京金阳普泰石油技术股份有限公司 | Construction method and system of adjacent well construction section in horizontal well target design |
| CN115822549B (en) * | 2021-09-17 | 2025-02-28 | 中国石油天然气集团有限公司 | Method for automatic arrangement of horizontal well trajectories |
| CN114839677A (en) * | 2022-03-22 | 2022-08-02 | 中国石油大学(北京) | Method and System for Determining Sand-Rich Areas in Deepwater Fans Without Well Constraints |
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| CA2277528C (en) * | 1999-07-16 | 2007-09-11 | Roman Bilak | Enhanced oil recovery methods |
| US7059414B2 (en) * | 2003-07-22 | 2006-06-13 | Bj Services Company | Acidizing stimulation method using a pH buffered acid solution |
| CN101936165B (en) * | 2009-07-03 | 2013-02-13 | 中国石油天然气股份有限公司 | Karst type carbonate reservoir well spacing method |
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