CN109296358A - Well cementation wellbore quality evaluation method - Google Patents
Well cementation wellbore quality evaluation method Download PDFInfo
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- CN109296358A CN109296358A CN201710612156.9A CN201710612156A CN109296358A CN 109296358 A CN109296358 A CN 109296358A CN 201710612156 A CN201710612156 A CN 201710612156A CN 109296358 A CN109296358 A CN 109296358A
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- 238000013441 quality evaluation Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011156 evaluation Methods 0.000 claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 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
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
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Abstract
The invention discloses a kind of well cementation wellbore quality evaluation methods.This method comprises: a), by the drilling well of well cementation to be evaluated wellbore quality being divided into multistage well section；B), the set of factors for influencing well cementation wellbore quality is determined；C), the weight fuzzy set of each factor in set of factors is determined；D), the well section for selecting the well cementation to be evaluated in a) to use one section of well section in the multistage well section of wellbore quality as well cementation wellbore quality to be evaluated；E), the membership function of each factor in set of factors corresponding to the well section in d) is determined；F), the membership function of each factor in the set of factors according to corresponding to the weight fuzzy set and well section of each factor carries out fuzzy evaluation with wellbore quality to the well cementation of the well section in d)；G), repeat d) to f) carrying out fuzzy evaluation with wellbore quality to the well cementation of drilling well.The well cementation, by carrying out fuzzy evaluation to each section of well section, realizes the Comprehensive Fuzzy Evaluation of the well cementation wellbore quality of drilling well with wellbore quality evaluation method.
Description
Technical field
The present invention relates to a kind of well cementation wellbore quality evaluation methods.
Background technique
Drilling engineering is one during oil-gas exploration and development with high investment, high risk, high-tech and multi-crossed disciplines
Complicated industry.The quality of a well wellbore construction quality, will have a direct impact on whether the well meets drilling well, geological design, construction
It can be normally carried out, oil-gas Layer can be protected to greatest extent, can guarantee long-term normal production of oil well etc., then influence whether
Whether huge investment can obtain the return of economical rationality.As investment of the domestic and international Oil Gas Investment side to drilling well is increasing,
Requirement to drilling quality is then higher and higher.To guarantee wellbore construction quality, it is essential for carrying out quality in site evaluation.It is existing
Generally with three big quality evaluation systems come appraisal drilling construction quality, i.e. coring quality evaluation, wellbore quality is evaluated and is consolidated for field
Well quality evaluation.
Existing wellbore quality evaluation method be only to influence wellbore quality a certain factor individually to wellbore quality into
Row evaluation, each combined factors that not will affect wellbore quality, which are got up, evaluates wellbore quality.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of each combined factors that will affect well cementation wellbore quality
Method to evaluate wellbore quality.Technical solution is as follows:
The present invention provides a kind of well cementation wellbore quality evaluation method, comprising:
A), the drilling well of well cementation to be evaluated wellbore quality is divided into multistage well section；
B), the set of factors for influencing well cementation wellbore quality is determined；
C), the weight fuzzy set of each factor in the set of factors is determined；
D), select it is described a) in well cementation to be evaluated use one section of well section in the multistage well section of wellbore quality as to
The well section of evaluating cementing wellbore quality；
E), the membership function of each factor in the set of factors corresponding to the well section in d) is determined；
F), in the set of factors according to corresponding to the weight fuzzy set of each factor and the well section it is each because
The membership function of element carries out fuzzy evaluation with wellbore quality to the well cementation of the well section in d)；
G), repeat d) to f) carrying out fuzzy evaluation with wellbore quality to the well cementation of the drilling well.
Preferably, each factor in the set of factors includes: hole diameter rule degree, hole enlargement ratio, cake thickness, full-shape
Change rate and hole angle.
It is highly preferred that the hole diameter rule degree, the hole enlargement ratio, the mud cake are thick in the weight fuzzy set
The sum of weight of degree, the rate of over-all angle change and the hole angle is 1,
Wherein, the weight of the hole diameter rule degree takes maximum, and the weight of the hole enlargement ratio and the cake thickness takes
Take second place, the weight of the rate of over-all angle change and the hole angle takes minimum.
It is highly preferred that the weight of the hole diameter rule degree is 0.35-0.45, the weight of hole enlargement ratio and cake thickness is
The weight of 0.15-0.25, rate of over-all angle change and hole angle is 0.05-0.15.
It is highly preferred that the weight of the hole diameter rule degree is 0.4, the weight of hole enlargement ratio and cake thickness is 0.2, entirely
The weight of angular rate of change and hole angle is 0.1.
It is highly preferred that in e) it is described it is determining d) in the well section corresponding to each factor in the set of factors
Membership function, for according to it is described it is determining d) in the well section corresponding to each factor in the set of factors actual value and
Corresponding different critical value determines the membership function of each factor in the set of factors corresponding to the well section in d).
It is highly preferred that the formula of the membership function of each factor in the set of factors corresponding to the well section are as follows:
M, n is natural number,
In formula, μmnRepresent n-th of membership function of m-th of factor in set of factors corresponding to well section；xmRepresent well section
The true value of m-th of factor in corresponding set of factors；amnRepresent of m-th of factor in set of factors corresponding to well section
N critical value；bmRepresent the middle critical value of m-th of factor in set of factors corresponding to well section.
It is highly preferred that the critical value of the hole diameter rule degree in the set of factors corresponding to the well section is respectively
5%, 10% and 15%；
The critical value of the hole enlargement ratio in the set of factors corresponding to the well section is respectively 0.5,0.8, with
And 1.0；
The critical value of the cake thickness in the set of factors corresponding to the well section be respectively 0.3mm, 0.5mm,
And 0.8mm；
The critical value of the rate of over-all angle change in the set of factors corresponding to the well section be respectively 2.5 °/30m,
5 °/30m and 8 °/30m；And
The critical value of the hole angle in the set of factors corresponding to the well section be respectively 30 °, 45 ° and
60°。
The beneficial effect of technical solution provided in an embodiment of the present invention is: by the way that drilling well is divided into multistage well section, and root
Weight fuzzy set according to each factor in the set of factors for influencing well cementation wellbore quality is corresponding with each factor of a certain well section
Membership function, fuzzy evaluation is carried out to this well section, by carrying out fuzzy evaluation to each section of well section, to realize consolidating for drilling well
The Comprehensive Fuzzy Evaluation of well wellbore quality.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, embodiment of the present invention will be made below further detailed
Thin description.
The embodiment of the present invention provides a kind of well cementation wellbore quality evaluation method, comprising:
A), the drilling well of well cementation to be evaluated wellbore quality is divided into multistage well section；
B), the set of factors for influencing well cementation wellbore quality is determined；
C), the weight fuzzy set of each factor in the set of factors is determined；
D), select it is described a) in well cementation to be evaluated use one section of well section in the multistage well section of wellbore quality as to
The well section of evaluating cementing wellbore quality；
E), the membership function of each factor in the set of factors corresponding to the well section in d) is determined；
F), in the set of factors according to corresponding to the weight fuzzy set of each factor and the well section it is each because
The membership function of element carries out fuzzy evaluation with wellbore quality to the well cementation of the well section in d)；
G), repeat d) to f) carrying out fuzzy evaluation with wellbore quality to the well cementation of the drilling well.
Well cementation provided in an embodiment of the present invention is with the working principle of wellbore quality evaluation method:
By the way that drilling well is divided into multistage well section, and according to each factor in the set of factors for influencing well cementation wellbore quality
Weight fuzzy set membership function corresponding with each factor of a certain well section, to this well section carry out fuzzy evaluation, by every
One section of well section carries out fuzzy evaluation, to realize the Comprehensive Fuzzy Evaluation of the well cementation wellbore quality of drilling well.Evaluation result can be with
The formulation for instructing well cementation cementing operation early period scheme, can be used for evaluation analysis of the cementing operation later period to cementing quality.
The embodiment of the present invention well cementation use wellbore quality evaluation method d) in one section of well section can be drilling well multistage
A certain section of well section in well section, or representative well section in the multistage well section of drilling well.
Each factor in the set of factors in the embodiment of the present invention includes: hole diameter rule degree, hole enlargement ratio, mud cake
Thickness, rate of over-all angle change and hole angle.The embodiment of the present invention selects the above-mentioned influence to well cementation wellbore quality bigger
Five kinds of factors carry out overall merit with wellbore quality to well cementation.
It will be appreciated by persons skilled in the art that in the present inventor's embodiment, it is described in the weight fuzzy set
The weight A of hole diameter rule degree1, the hole enlargement ratio weight A2, the cake thickness weight A3, the rate of over-all angle change
Weight A4And the weight A of the hole angle5The sum of be 1, i.e. A1+A2+A3+A4+A5=1, and inventor is according to practical warp
The influence maximum for summing up hole diameter rule degree to well cementation wellbore quality is tested, hole enlargement ratio and cake thickness take second place, and full-shape becomes
Angularly the influence for former three to well cementation wellbore quality is minimum for rate and hole deviation, therefore, the weight of the hole diameter rule degree
Take maximum, the weight of the hole enlargement ratio and the cake thickness, which takes, takes second place, the rate of over-all angle change and the hole angle
Weight takes minimum.
In practical applications, the weight A of the hole diameter rule degree1It can be 0.35-0.45, the weight A of hole enlargement ratio2
With the weight A of cake thickness3It all can be 0.15-0.25, the weight A of rate of over-all angle change4With the weight A of hole angle5It all can be
0.05-0.15.Preferably, the weight of the hole diameter rule degree can be 0.4, the weight of hole enlargement ratio and the power of cake thickness
Weight all can be 0.2, the weight of the weight of rate of over-all angle change and hole angle all can be 0.1.
In embodiments of the present invention, e) in it is described it is determining d) in the well section corresponding to it is each in the set of factors
The membership function of a factor, can according to it is described it is determining d) in the well section corresponding in the set of factors it is each because
The actual value and corresponding different critical value of element determine each factor in the set of factors corresponding to the well section in d)
Membership function.
The embodiment of the present invention can be using the person in servitude of each factor in the set of factors corresponding to the existing well section
The formula of membership fuction, is specifically as follows:
M, n is natural number
In formula, μmnRepresent n-th of membership function of m-th of factor in set of factors corresponding to well section；xmRepresent well section
The true value of m-th of factor in corresponding set of factors；amnRepresent of m-th of factor in set of factors corresponding to well section
N critical value；bmRepresent the middle critical value of m-th of factor in set of factors corresponding to well section.
Inventor gropes according to practice, by the critical value of each factor in the set of factors corresponding to well section
It is arranged to three representative numerical value, specifically:
The critical value of the hole diameter rule degree in the set of factors corresponding to the well section is respectively 0.5,0.8, with
And 1.0；AndWherein ε represent corresponding to well section because
The true value for the hole diameter rule degree that element is concentrated；
The critical value of the hole enlargement ratio in the set of factors corresponding to the well section is respectively 5%, 10%, with
And 15%, then the membership function of the hole enlargement ratio in the set of factors corresponding to well section be respectivelyAndWherein CAL represents factor corresponding to well section
The true value of the hole enlargement ratio of concentration；
The critical value of the cake thickness in the set of factors corresponding to the well section be respectively 0.3mm, 0.5mm,
And 0.8mm；AndWherein hmc represents well section
The true value of cake thickness in corresponding set of factors；
The critical value of the rate of over-all angle change in the set of factors corresponding to the well section be respectively 2.5 °/30m,
5 °/30m and 8 °/30m；AndWherein K represents well section
The true value of rate of over-all angle change in corresponding set of factors；And
The critical value of the hole angle in the set of factors corresponding to the well section be respectively 30 °, 45 ° and
60 °,AndWherein inc is represented corresponding to well section
The true value of hole angle in set of factors.
The well cementation to well section in the embodiment of the present invention carries out fuzzy evaluation with wellbore quality specifically can be flat using weighting
Equal type operator carries out overall merit with wellbore quality to well cementation.
Each well section of drilling well can be carried out using well cementation provided in an embodiment of the present invention with wellbore quality evaluation method
Difference evaluation in good, and the well section that wellbore quality is difference is analyzed, formulate targetedly modification strategy.
Embodiment 1
(1) one section of well section is divided by every 0.125 meter of 2723-3454m well section
D33-56 well finishing drilling well depth 3469m, casing programme are Depth 3454m under production string, design
Cement returns deep 2723m, does not return in the casing of upper layer, therefore evaluates the well cementation wellbore quality of 2723-3454m well section.By 2723-
Every 0.125 meter of 3454m well section is divided into one section of well section, amounts to 241 sections of well sections.
(2) set of factors of well cementation wellbore quality is determined
Determine D33-56 well production string well cementation wellbore quality=hole diameter rule degree, hole enlargement ratio, cake thickness, entirely
Angular rate of change, hole angle }.
It obtains the log data of well section to be evaluated: such as hole diameter, hole angle, bearing data, and calculating hole enlargement ratio, hole diameter
Rule degree, rate of over-all angle change, due to rate of over-all angle change generally with °/30m indicates, so the segment length based on taking 30m counts
It calculates, this well is calculated by taking 2723-2753m well section as an example.
Cake thickness data are obtained according to drilling liquid performance evaluating experimental result: taking oil layer section drilling well from D33-56 well scene
Liquid sample measures cake thickness, cake thickness 0.6mm according to low-temp low-pressure (API) leak-off experimental method.The data are experiment
Indoor detection as a result, simple in order to calculate, the cake thickness of full well section is 0.6.
The average caliper of 2723-2753m well section is 25.25cm, bit diameter 21.59cm, calculates hole enlargement ratio CAL
=(25.25-21.59)/21.59=16.95%.
The average caliper of 2723-2753m well section is 25.25cm, and electrical measurement hole diameter data are that every 0.125m surveys a data.
The hole diameter rule degree of the well section:
Rate of over-all angle change according to the deviational survey data well sections is 1.02 °/30m, and hole angle is 8.21 °.
Determine that the set of factors of each well section see the table below according to the method described above:
The set of factors of each well section of table 1
(3) determine that the average caliper of the membership function 2723-2753m well section of each factor of 2723-2753m well section expands
Rate is 16.95%, is calculated:
μ1=(0.2397,0.6167,0.9626)；
The hole diameter rule degree of 2723-2753m well section is 0.64, is calculated:
μ2=(0.9687,0.9620,0.8191)；
The cake thickness of 2723-2753m well section is 0.6, is calculated:
μ3=(0.6977,0.9608,0.8521)；
The rate of over-all angle change of 2723-2753m well section is 1.02, is calculated:
μ4=(0.9161,0.5307,0.1424)；
The hole angle of 2723-2753m well section is 8.21, is calculated:
μ5=(0.7910,0.5125,0.2659)；
(4) 2723-2753m well section carries out Comprehensive Fuzzy Evaluation
Using M (,+) operator, this operator is " weighted average type " comprehensive evaluation model, evaluation result are as follows:
In evaluate collection B 3 numerical value correspond respectively to, in, difference evaluation taxis, wellbore quality, that is, B of a certain well section
The corresponding evaluation result of middle numerical value the maximum.It is good in 2723-2753m well section evaluation result, in, the trend of difference be respectively 0.746,
0.805,0.731, therefore the evaluation result of the well section is that wellbore quality is medium.
2 are shown in Table using the wellbore quality situation that this method evaluates other well sections:
The each well section of table 2 well cementation wellbore quality evaluation result
By taking 2843-2873m well section as an example, it is good in evaluation result, in, difference trend difference 0.910,0.772,0.529, should
Well section evaluation result is that wellbore quality is good；By taking 3173-3203m well section as an example, it is good in evaluation result, in, difference trend difference
0.414,0.526,0.534, which is poor hole quality.
(5) D33-56 well production string well cementation wellbore quality evaluation result
According to this evaluation method, D33-56 well production string well cementation is 371m, well bore matter with the good segment length of wellbore quality
Measure the factor of merit=365m/725m=50.34%.
(6) evaluation result analysis and application
The implementation of the well well shaft fixing technology measure is instructed with wellbore quality evaluation result using the well cementation of D33-56 well.The well cement
3173-3203m evaluation result is poor in interval isolation, and main cause is that the well section hole diameter is irregular, therefore needs before cementing the well at this
Rotational flow generator is added in well section, improves replacement efficiency.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (8)
1. a kind of well cementation wellbore quality evaluation method characterized by comprising
A), the drilling well of well cementation to be evaluated wellbore quality is divided into multistage well section；
B), the set of factors for influencing well cementation wellbore quality is determined；
C), the weight fuzzy set of each factor in the set of factors is determined；
D), select it is described a) in well cementation to be evaluated use one section of well section in the multistage well section of wellbore quality as to be evaluated
The well cementation well section of wellbore quality；
E), the membership function of each factor in the set of factors corresponding to the well section in d) is determined；
F), each factor in the set of factors according to corresponding to the weight fuzzy set of each factor and the well section
Membership function carries out fuzzy evaluation with wellbore quality to the well cementation of the well section in d)；
G), repeat d) to f) carrying out fuzzy evaluation with wellbore quality to the well cementation of the drilling well.
2. well cementation wellbore quality evaluation method according to claim 1, which is characterized in that each in the set of factors
Factor includes: hole diameter rule degree, hole enlargement ratio, cake thickness, rate of over-all angle change and hole angle.
3. well cementation wellbore quality evaluation method according to claim 2, which is characterized in that in the weight fuzzy set
In, the hole diameter rule degree, the hole enlargement ratio, the cake thickness, the rate of over-all angle change and the hole angle
The sum of weight is 1,
Wherein, the weight of the hole diameter rule degree takes maximum, and the weight of the hole enlargement ratio and the cake thickness, which takes, takes second place,
The weight of the rate of over-all angle change and the hole angle takes minimum.
4. well cementation wellbore quality evaluation method according to claim 3, which is characterized in that the power of the hole diameter rule degree
Weight is 0.35-0.45, and the weight of hole enlargement ratio and cake thickness is 0.15-0.25, the weight of rate of over-all angle change and hole angle
For 0.05-0.15.
5. well cementation wellbore quality evaluation method according to claim 4, which is characterized in that the power of the hole diameter rule degree
Weight is 0.4, and the weight of hole enlargement ratio and cake thickness is 0.2, and the weight of rate of over-all angle change and hole angle is 0.1.
6. it is according to claim 2 well cementation use wellbore quality evaluation method, which is characterized in that in e) it is described it is determining d) in
The well section corresponding to each factor in the set of factors membership function, for according to it is described it is determining d) in the well
The actual value and corresponding different critical value of each factor in the set of factors corresponding to section determine the well section in d)
The membership function of each factor in the corresponding set of factors.
7. well cementation wellbore quality evaluation method according to claim 6, which is characterized in that institute corresponding to the well section
State the formula of the membership function of each factor in set of factors are as follows:
M, n is natural number
In formula, μmnRepresent n-th of membership function of m-th of factor in set of factors corresponding to well section；xmIt is right to represent well section institute
The true value of m-th of factor in the set of factors answered；amnRepresent n-th of m-th of factor in set of factors corresponding to well section
Critical value；bmRepresent the middle critical value of m-th of factor in set of factors corresponding to well section.
8. well cementation wellbore quality evaluation method according to claim 7, which is characterized in that
The critical value of the hole diameter rule degree in the set of factors corresponding to the well section be respectively 5%, 10% and
15%；
The critical value of the hole enlargement ratio in the set of factors corresponding to the well section be respectively 0.5,0.8 and
1.0；
The critical value of the cake thickness in the set of factors corresponding to the well section be respectively 0.3mm, 0.5mm and
0.8mm；
The critical value of the rate of over-all angle change in the set of factors corresponding to the well section be respectively 2.5 °/30m, 5 °/
30m and 8 °/30m；And
The critical value of the hole angle in the set of factors corresponding to the well section is respectively 30 °, 45 ° and 60 °.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114109350A (en) * | 2020-08-27 | 2022-03-01 | 中国石油化工股份有限公司 | Method for evaluating regularity of oil and gas well borehole |
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