CN102235155A - Method for designing position of directional well sucker rod string centering device - Google Patents
Method for designing position of directional well sucker rod string centering device Download PDFInfo
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- CN102235155A CN102235155A CN2011101967901A CN201110196790A CN102235155A CN 102235155 A CN102235155 A CN 102235155A CN 2011101967901 A CN2011101967901 A CN 2011101967901A CN 201110196790 A CN201110196790 A CN 201110196790A CN 102235155 A CN102235155 A CN 102235155A
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- rod string
- sucker rod
- centralizer
- centering device
- well
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Abstract
The invention relates to a method for designing the position of a directional well sucker rod string centering device. According to a sucker rod string ground indicator diagram and the three-dimensional characteristic of a well bore track, the mounting position of the centering device is determined on the basis of the three-dimensional space configuration of a sucker rod string, and thus a sucker rod string body or a coupling does not generate eccentric wear because of contacting an oil tube. The three-dimensional space configuration of the sucker rod string in a well bore is calculated by a finite element node iterative approach; the position of a contact point serves as the position of the centering device; based on the practical directional well three-dimensional well bore track and an actual measurement sucker rod string ground indicator diagram, the mounting position of the centering device is determined according to a practical possible contact point position, thereby eliminating all possible eccentric wears of the sucker rod string body or the coupling. The method is not only suitable for pressed rod strings but also suitable for pulled rod strings. The method has a very important meaning for reducing friction between the rod body and the oil tube, lowering the use amount of an injection molding centering device, prolonging the use periods of the sucker rod string and the oil tube and lowering operation cost.
Description
Technical field
The present invention relates to oil recovery technique field, oil field, a kind of sucker rod string in directional wells centralizer Position Design method particularly is provided.
Background technology
Rod string is one of core equipment of sucker rod pumping system, has super slenderness ratio structure, because the complexity of directional well well track, rod string is in down-hole reciprocating motion process, retrained by well track, and under the effect of asymmetric cyclic loading easily and oil pipe generation eccentric wear, thereby cause rod string disconnectedly take off or lost efficacy.The eccentric wear break-off accident of rod string can have a strong impact on crude oil production, increases face cost, improves crude oil cost.The oil field mostly adopts the mode that adds centralizer, anti-eccentric wear box cupling and fixing equidistant injection moulding bar to prevent eccentric wear at present.Though these methods have obtained certain effect, but still can't thoroughly solve the eccentric wear problem.Trace it to its cause, because present rod string centralizer Position Design mostly adopts the mode of equidistant distribution, like this because the usage quantity and the fixed-site of centralizer, possibly can't guarantee that on the one hand the local contact condition of rod string and oil pipe is improved, at non-contacting position the waste that centralizer can cause resource is installed on the other hand, more can increases the resistance of oil pumping system operation.
Summary of the invention
At defective of the prior art, the purpose of this invention is to provide a kind of rod string centralizer Position Design method, it is characterized in that determining the position of centralizer, also promptly determine the centralizer position according to possible sucker rod-oil pipe contact point according to the space configuration of rod string.This method can prevent rod string eccentric wear possibility to greatest extent, reaches again to save device placed in the middle or centralizer number, reduces the purpose of frictional resistance and weight.It has crucial meaning to the minimizing body of rod and oil pipe friction, the consumption that reduces the injection moulding centralizer, prolongation rod string and oil pipe life cycle, reduction operating cost.
In order to achieve the above object, the present invention adopts following technical proposals:
A kind of sucker rod string in directional wells centralizer Position Design method, it is according to the three-dimensional feature of rod string surface dynamometer card and well track, determining to determine the centralizer installation site on the basis of rod string three dimensions configuration, rod string body or box cupling are not being contacted with oil pipe and eccentric wear takes place.The core of this method can reduce following 3 points:
1) adopt finite element node alternative manner to calculate the three dimensions configuration of rod string in well, and with contacting points position as the centralizer position;
2) based on the directional well three dimensional hole trajectory of reality and actual measurement rod string surface dynamometer card (load-displacement curve);
3) above-mentioned rod string is made up of the standard sucker rod of present oil field use, and above-mentioned centralizer is the centralizer that use at present in any oil field.
The present invention has following outstanding advantage compared with prior art:
The present invention determines the centralizer installation site according to the contacting points position of actual capabilities, and it can eliminate all contingent rod string body or box cupling eccentric wear.This method not only is suitable for the pressurized roofbolt, and is suitable for the tension roofbolt.It has crucial meaning to the minimizing body of rod and oil pipe friction, the consumption that reduces the injection moulding centralizer, prolongation rod string and oil pipe life cycle, reduction operating cost.
Description of drawings
Fig. 1 is the well track graphics;
Fig. 2 is surface dynamometer card (load-displacement curve);
Fig. 3 is the contact position perspective view of no centralizer rod string in oil pipe;
Fig. 4 is
Constantly there be not the 3 D deformation figure of centralizer rod string in well;
Fig. 5 is
Constantly there be not the 3 D deformation figure of centralizer rod string in well;
Fig. 6 installs the rod string distorted projections figure of centralizer by this method design attitude;
The rod string that Fig. 7 installs centralizer by this method design attitude exists
3 D deformation figure constantly;
The rod string that Fig. 8 installs centralizer by this method design attitude exists
3 D deformation figure constantly.
Relate to above
The moment is subjected to top maximum pull effect constantly for rod string,
Be subjected to the top lowest pull constantly for rod string constantly.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples.
A kind of sucker rod string in directional wells centralizer Position Design method, it is according to the three-dimensional feature of rod string surface dynamometer card (load-displacement curve) and well track, determining to determine the centralizer installation site on the basis of rod string three dimensions configuration, rod string body or box cupling are not contacted with oil pipe and producing eccentric wear.
The standard sucker rod that described rod string is used by present oil field is formed, and described centralizer is the centralizer that use at present in any oil field.
Principle of the present invention is as follows:
Utilization is carried out rod string dynamic load signature analysis based on the rod string kinetic model of actual well track, calculate the axle power of each position of rod string, utilizing finite element node alternative manner to carry out rod string three dimensions configuration calculates, find out possible contact position, and with its installation site as centralizer.
Rod string mechanical model of the present invention is as follows:
The finite element kinetics equation of rod string is:
In the formula,
Modal displacement matrix for integral body;
,
,
With
Be total quality matrix, integral damping matrix, integral rigidity matrix and the overall load matrix of system respectively, integrated by cell matrix separately respectively, promptly
Wherein:
(2) in the formula:
Wherein:
Nonlinear stiffness matrix
Can be expressed as
In the formula:
Be the nonlinear stiffness matrix that produces under axial force and the crooked coupling;
Be the nonlinear stiffness matrix that produces under axial force and the deflection coupling;
Nonlinear stiffness matrix when reversing with crooked coupling.
In formula (3), (4), (6), (7), (8):
Be the rod string element length, unit is m;
Be modulus of elasticity, unit is Pa;
Be the rod string cross-sectional area, unit is m
2 
Be poisson's ratio;
Be the coefficient of rigidity, unit is Pa;
For the circular section for
The moment of inertia of axle, unit is m
4The circular section for the moment of inertia of y axle and z axle is
, unit is m
4Wherein
Be the circular section diameter, unit is m;
Be the cross section product of inertia, unit is m
4 
,
Be respectively
Node and
Node, the i.e. node at two ends, unit
The displacement of direction, unit is m;
,
Be respectively
Node and
Node, the i.e. node at two ends, unit
The corner of direction, unit are rad;
Be constant.
According to kinetics equation (1), try to achieve the whole transposed matrix of node, utilize Coordinate Conversion to obtain the modal displacement of unit, the whole rigid body displacement of stack again obtains the real displacement Changing Pattern of rod string each node in the motion process of down-hole at last.
Embodiment:
Closing the 129-155 well with certain oil field is example, and its three dimensional hole trajectory is seen Fig. 1, and roofbolt is combined as φ 19 * 455m+ φ 16 * 650m+ φ 19 * 195m, and H level bar, stroke are 2.5m, and jig frequency is 3.5 times/min, and pump is 1300m deeply.The surface dynamometer card that records (load-displacement curve) is seen Fig. 2.
Utilize the rod string space configuration of Finite Element Method calculating, can judge the contact position of rod string and oil pipe, and then the eccentric wear position of definite rod string.By the mechanics of materials as can be known, the maximum defluxion of the elongated straight-bar of central compression of an end freely-supported one end sliding support generally appears at the rod member midpoint.After determining between the contact zone, be that spacing is added centralizer and can be satisfied single sucker rod (general length is about 8m) and do not come in contact with oil pipe with 4m with Finite Element Method.Be respectively between the eccentric wear contact zone during two states showing among Fig. 3: (1) upstroke: 384m ~ 448m, 468m ~ 504m; (2) down stroke: 460m ~ 748m, 872m ~ 1296m.On the rod string between this lane place be that spacing is installed centralizer with 4m.
Because top concentrated load changes in time, causes the also corresponding change of rod string space configuration.When rod string be subjected to the top maximum pull do the time spent (
Constantly), rod string is near last borehole wall direction, and three-dimensional configuration figure sees Fig. 4.When rod string be subjected to the top lowest pull do the time spent (
Constantly), rod string comes in contact with following borehole wall direction in oil pipe, sees Fig. 5.After add centralizer between the contact zone that calculates, avoided contacting of rod string and oil pipe,
Constantly and
The distorted projections figure of rod string in oil pipe sees Fig. 6 constantly.
Constantly, originally rod string replaces with contacting of oil pipe with contacting by centralizer of oil pipe, has avoided rod string body or box cupling to contact with oil pipe and produces eccentric wear, sees Fig. 7.
Constantly, the three dimensions configuration of rod string in oil pipe behind the centralizer of design attitude interpolation according to said method seen Fig. 8.
Claims (5)
1. sucker rod string in directional wells centralizer Position Design method, it is characterized in that, three-dimensional feature according to rod string surface dynamometer card and well track, determining to determine the centralizer installation site on the basis of the three dimensions configuration of rod string in well, rod string body or box cupling are not being contacted with oil pipe and eccentric wear takes place.
2. a kind of sucker rod string in directional wells centralizer Position Design method according to claim 1, it is characterized in that, the three dimensions configuration of described rod string in well calculated by a kind of finite element node alternative manner, and with contacting points position as the centralizer position.
3. a kind of sucker rod string in directional wells centralizer Position Design method according to claim 1 is characterized in that the three-dimensional feature of described well track is based on the directional well three dimensional hole trajectory of reality.
4. a kind of sucker rod string in directional wells centralizer Position Design method according to claim 1 is characterized in that, described rod string surface dynamometer card is based on the rod string surface dynamometer card of actual measurement.
5. a kind of sucker rod string in directional wells centralizer Position Design method according to claim 1 is characterized in that, the standard sucker rod that described rod string is used by present oil field is formed, and described centralizer is the centralizer that use at present in any oil field.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101967901A CN102235155A (en) | 2011-07-14 | 2011-07-14 | Method for designing position of directional well sucker rod string centering device |
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| CN2011101967901A CN102235155A (en) | 2011-07-14 | 2011-07-14 | Method for designing position of directional well sucker rod string centering device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305031A (en) * | 2011-07-18 | 2012-01-04 | 上海大学 | Variable-interval injection molding sucker-rod string |
| CN103883267A (en) * | 2014-03-11 | 2014-06-25 | 中国石油天然气股份有限公司 | Arranging method and device for centralizer for drill rod |
| CN104213852A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Method for determining landing positions of oil well anti-eccentric centering devices |
| CN105164369A (en) * | 2013-05-27 | 2015-12-16 | 兰德马克绘图国际公司 | Gui-facilitated centralizing methods and systems |
| CN105239944A (en) * | 2015-10-14 | 2016-01-13 | 中国石油天然气股份有限公司 | Mounting method of complex well trajectory centralizers |
| CN108266177A (en) * | 2016-12-30 | 2018-07-10 | 中国石油天然气股份有限公司 | The determining method and apparatus of SAGD horizontal well pumping rod column combinations |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101397898A (en) * | 2008-09-16 | 2009-04-01 | 中国石油化工股份有限公司江苏油田分公司 | Eccentric wear prevention method for pumping well with pole |
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2011
- 2011-07-14 CN CN2011101967901A patent/CN102235155A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397898A (en) * | 2008-09-16 | 2009-04-01 | 中国石油化工股份有限公司江苏油田分公司 | Eccentric wear prevention method for pumping well with pole |
Non-Patent Citations (1)
| Title |
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| 刘合等: "用有限元法预测抽油杆柱与油管柱偏磨点位置", 《石油学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305031A (en) * | 2011-07-18 | 2012-01-04 | 上海大学 | Variable-interval injection molding sucker-rod string |
| CN105164369A (en) * | 2013-05-27 | 2015-12-16 | 兰德马克绘图国际公司 | Gui-facilitated centralizing methods and systems |
| CN104213852A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Method for determining landing positions of oil well anti-eccentric centering devices |
| CN104213852B (en) * | 2013-06-05 | 2016-06-08 | 中国石油天然气股份有限公司 | Method for determining position is entered under a kind of eccentric wear prevention of oil well centralizer |
| CN103883267A (en) * | 2014-03-11 | 2014-06-25 | 中国石油天然气股份有限公司 | Arranging method and device for centralizer for drill rod |
| CN105239944A (en) * | 2015-10-14 | 2016-01-13 | 中国石油天然气股份有限公司 | Mounting method of complex well trajectory centralizers |
| CN108266177A (en) * | 2016-12-30 | 2018-07-10 | 中国石油天然气股份有限公司 | The determining method and apparatus of SAGD horizontal well pumping rod column combinations |
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Application publication date: 20111109 |