CN107766662A - A kind of horizontal well test sectional evaluation method of shale gas - Google Patents

A kind of horizontal well test sectional evaluation method of shale gas Download PDF

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Publication number
CN107766662A
CN107766662A CN201711011233.1A CN201711011233A CN107766662A CN 107766662 A CN107766662 A CN 107766662A CN 201711011233 A CN201711011233 A CN 201711011233A CN 107766662 A CN107766662 A CN 107766662A
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well
horizontal well
section
gas
shale gas
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CN107766662B (en
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熊亮
简万洪
陈维
孔选林
郭卫星
温真桃
钟文俊
张南希
葛忠伟
周静
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China Petroleum and Chemical Corp
Sinopec Southwest Oil and Gas Co
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China Petroleum and Chemical Corp
Sinopec Southwest Oil and Gas Co
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/02—Agriculture; Fishing; Mining

Abstract

The present invention relates to oil and gas exploration and development field, more particularly to shale gas horizontal well in segments evaluation method.The geological syntheses evaluation method of shale gas horizontal well provided by the invention is applied to different configuration, the horizontal well test sectional evaluation of shale gas in different degrees of prospecting area, it is preferred that the shale gas horizontal well emphasis transformation well section gone out, shale fracturing transformation effect can be effectively improved, and then improves shale gas well yield.

Description

A kind of horizontal well test sectional evaluation method of shale gas
Technical field
The present invention relates to oil and gas exploration and development field, more particularly to the geologic assessment side of shale gas horizontal well Method.
Background technology
Shale gas staged fracturing of horizontal well technology is the key technology that shale gas realizes business development, to shale gas horizontal well The test sectional evaluation of carry out science is the important method for improving shale gas well deliverability.To realize horizontal well High Efficiency Reform, at present The peak group shale gas well of Longma small stream group-five carries out evaluation of classification using log interpretation technology to pit shaft shale reservoir more, and means are more It is single.
The content of the invention
It is an object of the invention to overcome to use shale gas well log interpretation technology to pit shaft shale in the prior art more The problem of reservoir carries out evaluation of classification, and means are more single, there is provided based on a kind of geologic horizon walked by horizontal well tunnel, According to reservoir static parameter explanation results and well logging element segmentation, with reference to the predictions such as Seismic Fracture, fragility and engineering ground stress, consolidate Well quality integrate the System Assessment Method of the horizontal well test segmentation of shale gas of sectional evaluation.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of geologic assessment method of shale gas horizontal well, comprises the following steps：
（1）The High-quality Reservoir well section of Horizontal Well Drilling chance is identified according to reservoir static parameter；
（2）It is segmented according to well logging element and its than value changes, fracture development section and crack is found according to record, well log interpretation Type gas-bearing formation；
（3）According to crustal stress, record well logging brittleness index and cementing quality carry out engineering objective segmentation, with reference to borehole seismic exploration curvature, Fragility prediction is controlled；
（4）Construction location residing for integrated water horizontal well, segmentation weight index is drafted, complete comprehensive segmentation, propose emphasis transformation well Section.
Further, the reservoir static parameter porosity, TOC, air content, brittleness index.
Further, step（1）In, lead eye or offset well core analyzing data is fitted according to straight, establish reservoir static state Parameter log interpretation model.
Further, the well logging element includes silicon, calcium, aluminium.
Preferably, the well logging element also includes at least one of sulphur, iron, potassium, manganese, titanium.
Further, step（2）In, according to element well logging, gas detection logging, accurately identified by landwaste secondary mineral mark Slit formation gas-bearing formation；Fracture development well section is explained according to well logging sound wave, resistance parameter.
Further, step（3）In, the crustal stress result explained using routine or dipole acoustic log is controlled, and is entered One step overlapping brittleness index is divided, while evaluates each section of cementing quality；
Carry out the prediction such as near wellbore earthquake curvature, fragility, ground stress deviation, pit shaft crack, brittle mineral development section are controlled System.
Compared with prior art, beneficial effects of the present invention：The geologic assessment side of shale gas horizontal well provided by the invention Method is applied to different configuration, the horizontal well test sectional evaluation of shale gas in different degrees of prospecting area, the shale air water preferably gone out Horizontal well emphasis transforms well section, can effectively improve shale fracturing transformation effect, and then improve shale gas well yield；In practice, application The inventive method diagram drilling well in use, realize completion pressure break test obtain 430,000 sides of natural gas open-flow capacity/day, achieve Preferable fracturing transformation effect.
Brief description of the drawings：
Fig. 1 is the specific steps schematic diagram that the present invention is implemented.
Fig. 2 is achievement instance graph among the horizontal well reservoir static state geology Parameter Subsection of the application present invention.
Fig. 3, Fig. 4 are achievement example among horizontal well element well logging and the fracture development of the present invention segmentation of the application present invention Figure.
Fig. 5 is the centre of horizontal well crustal stress the combination brittleness index progress engineering objective segmentation of the application present invention into fruit Illustration.
Fig. 6 is the horizontal well borehole seismic exploration curvature of the application present invention, the middle achievement instance graph of fragility segmentation.
Fig. 7 is the horizontal well test synthesis sectional evaluation end result instance graph of the application present invention.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in further detail.But this should not be interpreted as to this The scope for inventing above-mentioned theme is only limitted to following embodiment, all to belong to the present invention based on the technology that present invention is realized Scope.
Embodiment 1：As shown in figure 1, a kind of geologic assessment method for shale gas horizontal well that the present embodiment provides, including such as Lower step：
S100：According to reservoir evaluation standard, preferably go out porosity, TOC, air content, brittleness index（BI）Deng reservoir parameter conduct Optimal logging evaluation index；Using directly eye or offset well core analysis data is led, log interpretation model is established to reservoir static parameter Evaluation is explained, then in conjunction with well logging total hydrocarbon in gas logging, C1It has been shown that, carry out the division of reservoir static parameter quality section, shale gas storage Layer static parameter size is typically closely related with well track position.
Porosity：It is close using neutron-sound wave, Neutron-Density intersection calculation, or core porosity and monophone ripple, lithology Degree（Or compensation density）, compensated neutron establish unitary or n-tuple relation formula to calculate.There is the straight horizontal wellbore porosity for leading eye to explain Relations that are use multiple linear regression method, that is, being fitted between Logging Curves and rock core actual measurement effecive porosity, are obtained more more First linear regression relation, coefficient corresponding to each curve regarding area and series of strata depending on, as Weiyuan area effecive porosity PHIE= 0.004*GR+0.253*AC-34.585*CNL-1.163*DEN-1.632*RD-6.In addition, the analysis of main elements of clay constraint Also it is more conventional, i.e., Logging Curves are extracted into three essential elements, shale content and master are established by rock core measured value The fit correlation of element, the total porosity and clay porosity on stratum are then calculated, remove the i.e. effective hole of clay porosity Porosity.
TOC：Common method has △ lgR methods, artificial neural network method, bulk density method, multiple linear regression method, nature APPLICATION OF GAMMA ENERGY SPECTRAL METHOD, ECS and ordinary curve combined techniques and LithoScanner determination methods.The actual feelings logged well with reference to present level section Condition, unary formula, i.e. TOC=a*GR+b or TOC=a*DEN+b are established frequently with rock core TOC and natural gamma or density.
Air content：Conventional has read group total method, multiple linear regression method, the TOC Returns Law.The currently conventional TOC Returns Law, Establish unary formula using the relation of rock core air content and TOC to be calculated, GAS=a*TOC+b.
Brittleness index（BI）：Conventional has rock forming mineral component method, dipole sonic calculating method.Rock forming mineral component method is divided Siliceous, shale, carbonate rock content are not calculated, frequently with rock core total rock analyze data and log（GR, AC, DEN etc.） Multiple linear regression is established, or uses curve intersection method（AC-CNL）Calculated, then calculate brittleness index, brittleness index （%）=siliceous content/（Siliceous+shale+carbonate rock）*100.
S200：Sectional evaluation is carried out using element well logging constant, trace element and its ratio；Surveyed with reference to element well logging, gas Well logging, slit formation gas-bearing formation is accurately identified by landwaste secondary mineral mark, crack hair is explained according to well logging sound wave, resistance parameter Educate well section.
Change principle of stratigraphy with being first depending on, using with brill element well logging（XRF）Outcome data, choosing has instruction deposition Constant, trace element and its ratio of environmental change are segmented, and macroelement typically chooses Si, Ca, Mg, Al etc., micro member Element chooses Ti, K, Mn, P etc., and the mark such as Si/Ca, Si/Al, Ti/Al, and carrying out segmentation by the high and low value changes of three draws Divide, statistical appraisal.
Secondly slit formation gas-bearing formation identification is carried out.The identification of slit formation gas-bearing formation generally comprises following mark, is gas first Survey total hydrocarbon, component is substantially increased suddenly（Base value is surveyed higher than gas more than 5 times）, secondary mineral is seen in landwaste（Calcite or quartz）、 Element well logging Ca or Si content drastically raises.Meanwhile fracture development section well logging sound wave jumps or " jump ripple ", density present low value, Al-lateral resistivity curve shows as positive variance.Slit formation gas-bearing formation or fracture development section need independent layered queuing networks.
S300：Big section control is carried out according to the crustal stress interpretation results that routine or dipole acoustic log are explained, then is overlapped crisp Sex index is divided in detail, while evaluates each section of cementing quality；Carry out near wellbore earthquake curvature, fragility, ground stress deviation etc. Prediction, pit shaft crack, brittle mineral development section are controlled.
Crustal stress includes horizontal maximum, minimum, vertical crustal stress, and test segmentation is mainly using horizontal minimally stress index Divided.Using the combined elastic model of suitable shale formation, calculation formula：σh=μ*σv/（1-μ）+E*εh/(1-μ2)+ [(1-2*μ)/(1-μ)]*η*Pp+μ*E*εH/(1-μ2), in formula：Poisson's ratio (μ), Young's modulus (E), hole coefficient of elasticity (η), hang down To crustal stress (σv), formation pore pressure (Pp) intended using core experiment test data and interval transit time or density log data Conjunction is drawn；Tectonic strain coefficient (εH、εh)：Using mining site Splitting Method, with reference to formation of elastic parameters, pore pressure and vertical stress Value inverse is asked for.It is segmented first according to the horizontal minimally stress intensity difference calculated, in combination with above-mentioned well logging solution Release brittleness index（BI）With well logging element brittleness index（Ca+Si）Size division is carried out, with reference to the cementing quality glue of well log interpretation Tie, be medium, poor well section is segmented, evaluated.
Body curvature is used to describe the degree of crook that certain is put on curve, and radius of curvature is smaller, and the degree of crook of curve is bigger, ground Shake body curvature can reveal that micro-small fault（Crack）, fracture, by calculate can carry out earthquake curvature plane, section predict.Rock The fragility of stone is all to be discharged when being ruptured suddenly when rock stress reaches some limiting value in the form of elastic energy A kind of property, the general power that rock brittleness is described using brittleness index, rock power is obtained by earthquake prestack inversion method Learn parameter（Young's modulus, Poisson's ratio）, the new brittleness index E/ λ for directly characterizing reservoir degree of brittleness can further be calculated, E/ λ not only avoid the factors such as rock porosity, fluid, organic matter to Young's modulus, the influence of Poisson's ratio prediction, while to having Also there is preferable indicating effect in sharp brittle zone, fragility gassiness area on differentiating, while are provided with the meaning of geology and engineering " double desserts " Justice., can be to pit shaft crack, fragility using the sections such as near wellbore earthquake curvature, fragility, ground stress deviation and plane prediction result Mineral facies carry out Discrete control to development section.
S400：Construction location residing for integrated water horizontal well and horizontal well bore result in fact, draft the comprehensive primary and secondary for being segmented each index Relation, realize the fine sectional evaluation of " scheme of a well one "；It is segmented by comprehensive, identifies geology+engineering " double desserts " emphasis Transform section.
The horizontal well test sectional evaluation index of shale gas includes above-mentioned reservoir static parameter, brittleness index, element and its ratio The indexs such as value, minimum crustal stress, indices size walk the close phase of situation with the construction location where horizontal well and well track Close.It is single that horizontal well positioned at the fracture low and slow tectonic province of agensis, well track walks geologic horizon, brittleness index, member during segmentation Element and its ratio are relatively important compared with reservoir static parameter；Conversely, horizontal well is located at the high-dip structure area of mature fault, well track is worn Row geologic horizon is various, and reservoir static parameter is more relatively important than brittleness index, element and its ratio during segmentation.
The general process of comprehensive segmentation is as follows：Basis is segmented into horizontal minimum crustal stress, is subsequently superimposed slit formation respectively Gas-bearing formation be segmented, reservoir static parameter segmentation or brittleness index segmentation, element and its ratio segmentation, earthquake curvature, fragility prediction and Cementing quality segmentation only makes reference.It is especially noted that subsequent segment can only span not be segmented on the basis of previous segment, Minimum crustal stress, the segmentation of slit formation gas-bearing formation are strictly sequentially carried out, reservoir static parameter segmentation below and brittleness index Segmentation, element and its ratio segmentation can pass through situation according to Horizontal Well track and carry out precedence adjustment.Finally identify Relatively high TOC, high porosity, high air content, high fragility, fracture development section, for emphasis fracturing reform in engineering.
The application effect of the present invention is further elaborated using diagram for we below, and Fig. 2 is given using this hair Achievement example among the horizontal well reservoir static state geology Parameter Subsection of bright method, is numbered from Fig. 2（2）、（4）Section we can see Go out, the invention can provide optimal section of reservoir static state geologic parameter.
Fig. 3, Fig. 4 are given among horizontal well element well logging and the fracture development segmentation using the inventive method into fruit Example, from Fig. 3（1）、（3）、（6）In section and Fig. 4（2）、（4）Section is as can be seen that the present invention can provide the segmentation of element well logging With optimal section of fracture development.
Fig. 5 gives to be carried out in engineering objective segmentation using the horizontal well crustal stress combination brittleness index of the inventive method Between achievement example, from Fig. 5（1）、（3）、（5）Section it will be seen that the invention horizontal well can be provided can optimal section of pressure break.
Fig. 6 gives horizontal well borehole seismic exploration curvature, the middle achievement example of fragility segmentation, the upper left curvature profile from Fig. 6 （1）、（3）Section and lower-left fragility section（1）Section is it will be seen that the invention can provide near wellbore curvature, brittlement phase to most Excellent section.
Fig. 7 gives horizontal well test synthesis sectional evaluation end result example, from 3 in Fig. 7,5,6,7,9 sections I As can be seen that the invention can provide optimal section of horizontal well test sectional evaluation.

Claims (7)

  1. A kind of 1. geologic assessment method of shale gas horizontal well, it is characterised in that comprise the following steps：
    （1）The High-quality Reservoir well section of Horizontal Well Drilling chance is identified according to reservoir static parameter；
    （2）It is segmented according to well logging element and its than value changes, fracture development section and slit formation is found according to record, well log interpretation Gas-bearing formation；
    （3）According to crustal stress, record well logging brittleness index and cementing quality carry out engineering objective segmentation, with reference to borehole seismic exploration curvature, Fragility prediction is controlled；
    （4）Construction location residing for integrated water horizontal well, segmentation weight index is drafted, complete comprehensive segmentation, propose emphasis transformation well section.
  2. 2. the method as described in claim 1, it is characterised in that the reservoir static parameter porosity, TOC, air content, fragility Index.
  3. 3. method as claimed in claim 2, it is characterised in that step（1）In, according to directly leading eye or offset well core analyzing data It is fitted, establishes reservoir static parameter log interpretation model.
  4. 4. the method as described in claim 1, it is characterised in that the well logging element includes silicon, calcium, aluminium.
  5. 5. method as claimed in claim 4, it is characterised in that the well logging element is also included in sulphur, iron, potassium, manganese, titanium extremely Few one kind.
  6. 6. the method as described in claim 1, it is characterised in that step（2）In, according to element well logging, gas detection logging, pass through rock Bits secondary mineral mark accurately identifies slit formation gas-bearing formation；Fracture development well section is explained according to well logging sound wave, resistance parameter.
  7. 7. the method as described in claim 1, it is characterised in that step（3）In, explained using routine or dipole acoustic log Crustal stress result is controlled, and is further overlapped brittleness index and is divided, while evaluates each section of cementing quality；
    Carry out the prediction such as near wellbore earthquake curvature, fragility, ground stress deviation, pit shaft crack, brittle mineral development section are controlled System.
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Cited By (14)

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CN109025982A (en) * 2018-07-16 2018-12-18 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 Classification evaluation method, device and the terminal device of shale gas exploitation interval
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
CN110714745A (en) * 2019-10-17 2020-01-21 中国石油集团长城钻探工程有限公司 Shale gas horizontal well fracturing staged optimization method
CN111456709A (en) * 2020-04-20 2020-07-28 中国石油天然气集团有限公司 Horizontal well multistage fracturing and staged clustering method based on logging curve
CN111810133A (en) * 2019-04-10 2020-10-23 中国石油化工股份有限公司 Stratum brittleness evaluation method
CN111997598A (en) * 2020-09-04 2020-11-27 长江大学 Logging reservoir stratum while drilling evaluation method, model building method, device and electronic equipment
CN112065375A (en) * 2019-05-21 2020-12-11 中国石油化工股份有限公司 Method and system for calculating gas content of shale stratum
CN112085305A (en) * 2019-06-13 2020-12-15 中国石油天然气集团有限公司 Method and device for evaluating storage layer seam network performance
CN112696197A (en) * 2020-12-30 2021-04-23 中国石油天然气集团有限公司 Oil field reservoir index curve construction method, system, equipment and storage medium
CN112963145A (en) * 2021-02-23 2021-06-15 中国石油天然气股份有限公司 Method for predicting gas well productivity of carbonate reservoir
CN113673771A (en) * 2021-08-24 2021-11-19 中国石油化工股份有限公司 Shale gas horizontal well fracturing segmentation method
CN114183134A (en) * 2021-07-07 2022-03-15 中国石油化工股份有限公司 Shale gas horizontal well ground stress prediction method and system
CN114427451A (en) * 2020-09-11 2022-05-03 中国石油化工股份有限公司 Method for obtaining shale reservoir static parameters based on while-drilling data
CN115032361A (en) * 2021-03-03 2022-09-09 中国石油化工股份有限公司 Method for evaluating organic carbon content of shale oil reservoir based on genetic optimization neural network algorithm

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CN109025982A (en) * 2018-07-16 2018-12-18 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 Classification evaluation method, device and the terminal device of shale gas exploitation interval
CN111810133A (en) * 2019-04-10 2020-10-23 中国石油化工股份有限公司 Stratum brittleness evaluation method
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
CN112065375A (en) * 2019-05-21 2020-12-11 中国石油化工股份有限公司 Method and system for calculating gas content of shale stratum
CN112065375B (en) * 2019-05-21 2024-01-30 中国石油化工股份有限公司 Method and system for calculating gas content of shale stratum
CN112085305A (en) * 2019-06-13 2020-12-15 中国石油天然气集团有限公司 Method and device for evaluating storage layer seam network performance
CN110714745A (en) * 2019-10-17 2020-01-21 中国石油集团长城钻探工程有限公司 Shale gas horizontal well fracturing staged optimization method
CN111456709A (en) * 2020-04-20 2020-07-28 中国石油天然气集团有限公司 Horizontal well multistage fracturing and staged clustering method based on logging curve
CN111456709B (en) * 2020-04-20 2023-09-26 中国石油天然气集团有限公司 Horizontal well multistage fracturing segmentation clustering method based on logging curve
CN111997598A (en) * 2020-09-04 2020-11-27 长江大学 Logging reservoir stratum while drilling evaluation method, model building method, device and electronic equipment
CN111997598B (en) * 2020-09-04 2024-03-26 长江大学 Logging while-drilling reservoir evaluation method, model building method, device and electronic equipment
CN114427451A (en) * 2020-09-11 2022-05-03 中国石油化工股份有限公司 Method for obtaining shale reservoir static parameters based on while-drilling data
CN112696197A (en) * 2020-12-30 2021-04-23 中国石油天然气集团有限公司 Oil field reservoir index curve construction method, system, equipment and storage medium
CN112963145B (en) * 2021-02-23 2023-12-26 中国石油天然气股份有限公司 Method for predicting capacity of carbonate reservoir gas well
CN112963145A (en) * 2021-02-23 2021-06-15 中国石油天然气股份有限公司 Method for predicting gas well productivity of carbonate reservoir
CN115032361A (en) * 2021-03-03 2022-09-09 中国石油化工股份有限公司 Method for evaluating organic carbon content of shale oil reservoir based on genetic optimization neural network algorithm
CN114183134A (en) * 2021-07-07 2022-03-15 中国石油化工股份有限公司 Shale gas horizontal well ground stress prediction method and system
CN114183134B (en) * 2021-07-07 2022-09-13 中国石油化工股份有限公司 Shale gas horizontal well ground stress prediction method and system
CN113673771A (en) * 2021-08-24 2021-11-19 中国石油化工股份有限公司 Shale gas horizontal well fracturing segmentation method

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