CN104153764A - Method for determining shape of shaft in gas drilling open hole section - Google Patents
Method for determining shape of shaft in gas drilling open hole section Download PDFInfo
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- CN104153764A CN104153764A CN201410379950.XA CN201410379950A CN104153764A CN 104153764 A CN104153764 A CN 104153764A CN 201410379950 A CN201410379950 A CN 201410379950A CN 104153764 A CN104153764 A CN 104153764A
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Abstract
The invention discloses a method for determining the shape of a shaft in a gas drilling open hole section. The method comprises the following steps that a, six-arm logging data of a target well section are obtained, and the one-to-one correspondence relation between three groups of borehole diameter measured values and corners is established; b, an interpolation interval is determined, and borehole diameters corresponding to all the corners in the interpolation interval are calculated according to a thrice spline interpolation function; c, according to an interpolation calculated result, obtained in the step b, of the borehole diameters of the borehole section at different depths, a borehole section shape changing along with changes of the well depths is drawn, and a borehole section circumference curve is reconstructed. The method is suitable for reconstructing gas drilling borehole section shape features, can accurately reflect gas drilling borehole features, and provides a guide for follow-up drilling and completion practices such as pigging and casing running.
Description
Technical field
The invention belongs to oilfield prospecting developing well analogue technique field, specifically a kind of definite method of gas drilling uncased wellbore shape.
Background technology
Gas drilling due to its have rate of penetration high, reduce or avoid leakage, avoid many-sided advantages such as reservoir damage, be listed in one of tool potentiality technology of 21 century.In recent years, domestic gas drilling application technology develops rapidly, and Tarim Oilfield has successively carried out the inferior air hammer gas of more than ten wells and crept into, the nearly myriametre of accumulative total drilling depth.Yet except hole deviation control problem, the complex situations that setting of casing is hampered frequently appear in Tarim Oilfield air hammer drilling well well section, have a strong impact on drilling efficiency, have extended drilling period, this has weakened the high efficiency of air drilling to a certain extent.Trace it to its cause, because air hammer well-drilling borehole cross section exists serious scrambling, cause the complex situations such as gas drilling drilling tool blocked portion and sleeve pipe are hampered.Therefore, reflect more accurately well feature, to follow-up brill completion practice, provide guidance, be of great practical significance.
The assurance of well feature is lowered to most important for drill string blocked portion, sleeve pipe, mining site is often usingd actual measurement mean radius as the standard of evaluating well, from six arm log datas, find, the mean radius in the arbitrary cross section of air hammer drilling well section, submountain region, Tarim Basin is than bit diameter large 15% ~ 28%, but the fashionable situation that is hampered takes place frequently under sleeve pipe, and there is drill string blocked portion phenomenon.Therefore, the mean radius of usining exists great defect as the standard of evaluating well, because air hammer well-drilling borehole cross section exists serious scrambling, mean radius can not be described the well section feature that gas drilling forms, only be concerned about that mean radius enters well operations to follow-up tubing string and can produce wrong guiding, have influence on the design scheme of drifting drilling assembly and the enforcement of casing job, cause the sleeve pipe complicated phenomenon that is hampered.Need to, based on actual measurement six arm log datas, according to cubic spline functions, reflect more accurately gas drilling well cross sectional shape, for the follow-up schemes such as drifting, setting of casing provide important references for this reason.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of gas drilling Open-Hole Section pit shaft method for determining shape, be applicable to reflect gas drilling wellbore shape, for follow-up brill completion practice provides guidance.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A gas drilling Open-Hole Section pit shaft method for determining shape, comprises the steps:
A. obtain six arm log datas of target well section, set up the one-to-one relationship of six groups of radius measurement values and corner;
B. determine interpolation section, according to cubic spline functions, calculate the interior radius corresponding to each corner of interpolation section;
C. according to the well section radius interpolation calculation result under step b gained different depth, draw the well cross sectional shape changing with well depth, reconstruct well cross-sectional periphery curve.
The corresponding relation of setting up radius measurement value and corner in described step a, concrete steps are as follows:
A1. six groups of radius measurement values in log data are arranged in order in order, between its corresponding corner, are separated by 60 °;
A2. radius measurement value and corner are written as to the discrete corresponding relation under polar coordinate system.
The radius measurement value of calculating corresponding any rotation angle in interpolation section in described step b, specifically comprises the following steps:
B1. determine interpolation section, for circular order error that matching is obtained is less and do not occur cusp at tie point place, corner interpolation section should be greater than 2 π, and interpolation step-length can be taken as 0.1rad;
B2. theoretical according to cubic spline functions, cubic interpolation function is set up in segmentation;
B3. according to interpolating function, computing function value in interpolation section, i.e. radius interpolation.
Above-mentioned well is gas drilling Open-Hole Section, comprises air hammer and pendulum assembly institute drilling well eye.
Compared with prior art, beneficial effect of the present invention is:
A kind of gas drilling Open-Hole Section pit shaft method for determining shape provided by the invention, is reconstructed well cross sectional shape under each degree of depth based on six arm log datas, employing cubic spline interpolation technology, and it can reflect gas drilling well section feature more accurately.Thereby can provide reference for follow-up brill completion practice scheme.
Accompanying drawing explanation
Fig. 1 is gas drilling six arm log data curves.
Fig. 2 is a certain position of air hammer well section well cross sectional shape
Fig. 3 is a certain section of well feature of air hammer well section.
Fig. 4 is a certain position of pre-bending pendulum assembly well section well cross sectional shape
Fig. 5 is a certain section of well feature of pre-bending pendulum assembly well section.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present embodiment be applied to the gas drilling Open-Hole Section pit shaft of a certain block XXX well be shaped as example the inventive method is elaborated, this well gas drilling well section is divided into two parts, first uses air hammer to creep into, and then adopts the air drilling of pre-bending pendulum.
A gas drilling Open-Hole Section pit shaft method for determining shape, specifically comprises the steps:
1) carry out six arm radius logging operations, obtain this well six arm log datas, obtain the radius data that six arms are corresponding, as shown in Figure 1.
2) utilize cubic spline functions, calculate radius length corresponding to each corner in cross-sectional periphery.Cubic interpolation polynomial expression-form is:
(1)
In formula,
it is radius interpolating function;
for corner variable, radian;
the corner that measuring point is corresponding, radian;
corresponding to measuring point
(
=1～6) radius measurement value,
for undetermined coefficient, and
be
single order business poor,
be
single order business poor,
(3)
(4)
Utilize the second dervative condition of continuity:
(5)
And First Boundary Condition:
(6)
Solve undetermined coefficient
, obtain
,
...
thereby, obtain the cubic spline functions of radius
.
3) according to corner-radius corresponding relation, draw the well cross sectional shape changing with well depth, as shown in Figure 2.In Fig. 2, left field shows whole well section pit shaft feature, and color represents least radius variation characteristic, and what Fig. 2 right side showed is well depth 2664m place (air hammer well section) well cross sectional shape.
4) getting air hammer well section amplifies, can find out that this well section changes very complicated with well depth, as shown in Figure 3, except elliptical shape is fairly obvious, between its upper and lower cross sectional shape, change difference large, there is serious rough phenomenon, illustrate that the method for the mean radius evaluation hole quality generally utilizing at present exists obvious limitation.
5) from well depth 2766m, use pre-bending pendulum BHA, well feature and the X-Y scheme of giving uniform section are as shown in Figure 4 later.
6) pre-bending pendulum well section partial enlarged drawing as shown in Figure 5.As can be seen from the figure, well cross section changes and has good smoothness with well depth, changes relatively even.
Well described in the present invention is gas drilling barefoot interval, can be air hammer drilling well or pendulum assembly drilling well.
Utilize method provided by the invention, based on six arm log datas, utilize cubic spline functions, can reconstruct gas drilling pit shaft cross sectional shape, for the follow-up brill completion practices such as drifting, setting of casing provide reference.
The embodiment of the present invention, based on actual measurement six arm log datas, is utilized cubic spline functions, considers expansion interpolation section, thereby obtains well cross sectional shape more accurately, to better instruct, bores completion practice.
The inventive method is equally applicable to mud drilling.
Claims (4)
1. a gas drilling Open-Hole Section pit shaft method for determining shape, is characterized in that, comprises the steps:
A. obtain six arm log datas of target well section, set up the one-to-one relationship of six groups of radius measurement values and corner;
B. determine interpolation section, according to cubic spline functions, calculate the interior radius corresponding to each corner of interpolation section;
C. according to the well section radius interpolation calculation result under step b gained different depth, draw the well cross sectional shape changing with well depth, reconstruct well cross-sectional periphery curve.
2. gas drilling Open-Hole Section pit shaft method for determining shape according to claim 1, is characterized in that, in described step a, set up the corresponding relation of radius measurement value and corner, concrete steps are as follows:
A1. six groups of radius measurement values in log data are arranged in order in order, between its corresponding corner, are separated by 60 °;
A2. radius measurement value and corner are written as to the discrete corresponding relation under polar coordinate system.
3. gas drilling Open-Hole Section pit shaft method for determining shape according to claim 1, is characterized in that, calculates the radius measurement value of corresponding any rotation angle in interpolation section in described step b, specifically comprises the following steps:
B1. determine interpolation section, for circular order error that matching is obtained is less and do not occur cusp at tie point place, corner interpolation section is greater than 2 π, and interpolation step-length is taken as 0.1rad;
B2. theoretical according to cubic spline functions, cubic interpolation function is set up in segmentation;
B3. according to interpolating function, computing function value in interpolation section, i.e. radius interpolation.
4. gas drilling Open-Hole Section pit shaft method for determining shape according to claim 1, is characterized in that, described well is gas drilling Open-Hole Section, comprises air hammer and pendulum assembly institute drilling well eye.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410379950.XA CN104153764A (en) | 2014-08-05 | 2014-08-05 | Method for determining shape of shaft in gas drilling open hole section |
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| CN201410379950.XA CN104153764A (en) | 2014-08-05 | 2014-08-05 | Method for determining shape of shaft in gas drilling open hole section |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626045A (en) * | 2014-10-29 | 2016-06-01 | 中国石油天然气股份有限公司 | Method and device for determining shape of shaft |
| CN107780926A (en) * | 2017-09-20 | 2018-03-09 | 南方科技大学 | Well cross sectional shape measuring method, device and terminal |
| CN112161534A (en) * | 2020-10-16 | 2021-01-01 | 重庆大学 | One-step mining control blasting method for mine underground upward access |
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| CN101819280A (en) * | 2010-04-01 | 2010-09-01 | 山东科技大学 | Logging instrument three-dimensional data interpolation method |
| CN201857958U (en) * | 2010-07-30 | 2011-06-08 | 西安威盛电子仪器有限公司 | Six-arm borehole diameter logger |
| CN202970704U (en) * | 2012-10-23 | 2013-06-05 | 中国石油集团长城钻探工程有限公司 | Multipoint interpolation hole diameter calibration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101819280A (en) * | 2010-04-01 | 2010-09-01 | 山东科技大学 | Logging instrument three-dimensional data interpolation method |
| CN201857958U (en) * | 2010-07-30 | 2011-06-08 | 西安威盛电子仪器有限公司 | Six-arm borehole diameter logger |
| CN202970704U (en) * | 2012-10-23 | 2013-06-05 | 中国石油集团长城钻探工程有限公司 | Multipoint interpolation hole diameter calibration device |
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| 田颖: "样条插值方法在舰炮武器系统试验数据处理中的应用", 《火力与指挥控制》 * |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105626045A (en) * | 2014-10-29 | 2016-06-01 | 中国石油天然气股份有限公司 | Method and device for determining shape of shaft |
| CN107780926A (en) * | 2017-09-20 | 2018-03-09 | 南方科技大学 | Well cross sectional shape measuring method, device and terminal |
| WO2019056536A1 (en) * | 2017-09-20 | 2019-03-28 | 南方科技大学 | Wellbore cross section shape measurement method, device and terminal |
| CN107780926B (en) * | 2017-09-20 | 2020-05-22 | 南方科技大学 | Borehole section shape measuring method, device and terminal |
| CN112161534A (en) * | 2020-10-16 | 2021-01-01 | 重庆大学 | One-step mining control blasting method for mine underground upward access |
| CN112161534B (en) * | 2020-10-16 | 2022-06-03 | 重庆大学 | One-step mining control blasting method for mine underground upward access |
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Application publication date: 20141119 |