CN105631177A - Determining method of limit operating torque of single shoulder drilling tool joint - Google Patents
Determining method of limit operating torque of single shoulder drilling tool joint Download PDFInfo
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Abstract
The embodiment of the invention provides a determining method of the limit operating torque of a single shoulder drilling tool joint. The determining method comprises following steps of obtaining the limit operating torque calculation model of the single shoulder drilling tool joint according to the structure parameters of a to-be-measured single shoulder drilling tool joint; obtaining the limit operating torque corresponding to each preset axial tension of the single shoulder drilling tool joint according to the limit operating torque calculation model, wherein there is at least one axial tension, the axial tension and the limit operating torque are in one-to-one correspondence. According to the method provided by the invention, the limit operating torque calculation model is obtained according to accurate measurement and calculation of the single shoulder drilling tool joint; the actual stress distribution features can be reflected fully; the limit operating torque of the single shoulder drilling tool joint can be determined accurately; and the accidents resulted from drilling tool joint failures in drilling processes can be effectively reduced.
Description
Technical field
The present embodiments relate to petroleum works and mechanical field, particularly relate to the defining method of the maximal work moment of torsion of a kind of single shoulder drilling tool joint.
Background technology
Drilling tool is the main tool for transmitting power, conveying drilling fluid, particularly particularly important in oilfield drilling process, along with deep-well, ultradeep well, extended horizontal well quantity increase year by year, tool joint, particularly the torsional property of tool joint is of increased attention, and therefore drilling tool failure accident can bring huge economic loss.
In prior art, the mode of the conventional serviceability evaluating drilling tool includes following two: first kind of way is according to complex load operating modes such as the axial tension assumed, moments of flexure, provide the torsional strength computing formula of tool joint, the second way is adopt two-dimensional axial symmetric FEM (finite element) model that the stress of tool joint is analyzed, to evaluate the serviceability of drilling tool. But in actual applications, operation torque usually occur still demarcating in torque limit (actual be ultimate torque) when zero axial tension, but there is situation about losing efficacy in tool joint. Two-dimensional axial symmetric model is difficult to evaluate the stress characteristic of tool joint under the complex working conditions such as torque wrench moment, moment of flexure, the maximal work moment of torsion of the tool joint being therefore also difficult under reflection actual working environment, and the structure of list shoulder drilling tool joint is complicated, including the lead angle of ridge, slave station shoulder etc., and bear the effect of the complex loads such as torque wrench moment, axial tension, moment of flexure and operation torque, its stress behavior belongs to D elastic-plastic feature.
Existing computing formula and existing two-dimensional FE analysis, all can not fully reflect the stress distribution feature of reality, single shoulder drilling tool joint maximal work moment of torsion cannot be determined accurately, cause the security incident occurring causing due to tool joint inefficacy in a large number in drilling process.
Summary of the invention
The embodiment of the present invention provides the defining method of the maximal work moment of torsion of a kind of single shoulder drilling tool joint, to solve prior art can not fully reflect the stress distribution feature of reality, cannot accurately determine single shoulder drilling tool joint maximal work moment of torsion, thus causing occurring in drilling process a large amount of losing efficacy the problem of the security incident caused due to tool joint.
The present invention provides the defining method of the maximal work moment of torsion of a kind of single shoulder drilling tool joint, including:
Structural parameters according to single shoulder drilling tool joint to be measured, obtain the maximal work torque arithmetic model of described single shoulder drilling tool joint;
According to described maximal work torque arithmetic model, obtaining the maximal work moment of torsion that each axial tension pre-set of described single shoulder drilling tool joint is corresponding, described axial tension is at least one, and described axial tension and described maximal work moment of torsion one_to_one corresponding.
Optionally, after the maximal work moment of torsion that each axial tension pre-set of the described single shoulder drilling tool joint of described acquisition is corresponding, described method also includes:
According to described maximal work torque arithmetic model, obtain the area of safety operaton of single shoulder drilling tool joint.
Optionally, the described structural parameters according to single shoulder drilling tool joint to be measured, obtain the maximal work torque arithmetic model of described single shoulder drilling tool joint, including:
Described single shoulder drilling tool joint is chosen measurement point and carries out material properties test, obtain the mechanical property parameters of described single shoulder drilling tool joint material.
Optionally, the described structural parameters according to single shoulder drilling tool joint to be measured, obtain the maximal work torque arithmetic model of described single shoulder drilling tool joint, also include:
Obtain the structural parameters of described single shoulder drilling tool joint;
Set up the 3-D geometric model of described single shoulder drilling tool joint according to described structural parameters, and described 3-D geometric model carries out FEM meshing is at least ten ten thousand unit;
According to described mechanical property parameters, calculate the element stress obtaining described single shoulder drilling tool joint;
According to described element stress and described mechanical property parameters, obtain the maximal work moment of torsion that each axial tension arranged is corresponding;
Obtain the maximal work moment of torsion corresponding to zero axial tension of described single shoulder drilling tool joint according to existing APIRP7G standard, and verify whether correct according to the maximal work moment of torsion that described element stress is corresponding with zero axial tension that described mechanical property parameters obtains;
If correct, then axial tension and described maximal work moment of torsion according at least five, obtain the described maximal work torque arithmetic model of described single shoulder drilling tool joint.
Optionally, described according to described mechanical property parameters, calculating obtains the element stress of described single shoulder drilling tool joint, including:
Increment formula according to the single shoulder drilling tool joint unit governing equation described based on Lagrange and Green strain tensor, obtains the finite element governing equation of single shoulder drilling tool joint;
According to described mechanical property parameters, adopt the deformation of each unit of the described finite element governing equation described single shoulder drilling tool joint of acquisition;
Deformation according to each described unit and the material constitutive relation acquiring unit stress of described single shoulder drilling tool joint.
Optionally, the mechanical property parameters of described single shoulder drilling tool joint includes the elastic modelling quantity of described single shoulder drilling tool joint, Poisson's ratio and maximum tension strain.
Optionally, the finite element governing equation of described single shoulder drilling tool joint is:
Wherein, cTExpanding the rank transposed matrix to the Boolean matrix c of this list shoulder drilling tool joint structural system modal displacement for Displacement of elemental node, S is Kirchoff&apos stress tensor, BTFor the transposed matrix of element strain matrix B, NTFor the transposed matrix of unit shape function N, V is the volume of the initial configuration of single shoulder drilling tool joint; A is the surface area of the initial configuration of single shoulder drilling tool joint. The differential of the cell list area of the initial configuration of the mono-shoulder drilling tool joint of dA, dV is the differential of the unit volume of the initial configuration of single shoulder drilling tool joint.
Optionally, the described maximal work torque arithmetic model of described single shoulder drilling tool joint is:
M=-10-9*T3+5*10-6*T2-0.0076*T+30.463;
Wherein, M represents maximal work moment of torsion, and T represents axial tension.
Optionally, the unit number that described 3-D geometric model carries out FEM meshing is 33.27 ten thousand; The number of the test point chosen when described single shoulder drilling tool joint material properties test is not less than 20.
The present invention provides the defining method of the maximal work moment of torsion of a kind of single shoulder drilling tool joint, by accurately measuring acquisition maximal work torque arithmetic model according to single shoulder drilling tool joint, then pass through this model calculate it is to be appreciated that maximal work moment of torsion corresponding to axial tension, it is used for instructing spudder to make, can fully reflect the stress distribution feature of reality, determine single shoulder drilling tool joint maximal work moment of torsion accurately, effectively reduce losing efficacy the accident caused due to tool joint in drilling well.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the determination embodiment of the method one of the maximal work moment of torsion of list shoulder drilling tool joint of the present invention;
Fig. 2 is the flow chart of the determination embodiment of the method two of the maximal work moment of torsion of list shoulder drilling tool joint of the present invention;
Fig. 3 is the 3-D geometric model schematic diagram of single shoulder drilling tool joint;
Fig. 4 is single shoulder drilling tool joint three-dimensional finite element model schematic diagram;
Fig. 5 a is axial tension is that maximal work moment of torsion when zero applies curve;
Fig. 5 b is that maximal work moment of torsion during axial tension 3200kN applies curve;
Fig. 6 is that axial tension applies curve with maximal work moment of torsion;
Fig. 7 is the subregion schematic diagram of axial tension and maximal work moment of torsion.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The object that the described single shoulder drilling tool joint mentioned in the present invention is suitable for includes the workpiece such as drilling rod, drill collar, adapter, regulator, amortisseur, bumper jar, bypass valve, additionally the defining method of the operation torque of this list shoulder drilling tool joint may be used for any drilling tool needing joint, and this present invention is not limited.
Single shoulder drilling tool joint in the present invention refers to the turntable shoulder grafting head described in API standard, it is characterized in that this type joint only comprises a shoulder (see Fig. 3 and Fig. 4), this shoulder, also known as sealing shoulder, produces contact pressure to ensure the sealing property of joint on the shoulder field of conjugate action after joint pretension.
Fig. 1 is the flow chart of the determination embodiment of the method one of the maximal work moment of torsion of list shoulder drilling tool joint of the present invention, as it is shown in figure 1, the concretely comprising the following steps of the defining method of the operation torque of this list shoulder drilling tool joint:
S101: the structural parameters according to single shoulder drilling tool joint to be measured, obtains the maximal work torque arithmetic model of described single shoulder drilling tool joint.
In the present embodiment, these structural parameters refer to the geometrical structure parameter of this list shoulder drilling tool joint, need to obtain in advance, instrument can be passed through and measure acquisition, can also measure, according to producer, the data acquisition provided, according to these structural parameters and measurement that some are follow-up, calculate the maximal work torque arithmetic model that can obtain shoulder drilling tool joint.
S102: according to described maximal work torque arithmetic model, obtain the maximal work moment of torsion that each axial tension pre-set of described single shoulder drilling tool joint is corresponding, described axial tension is at least one, and described axial tension and described maximal work moment of torsion one_to_one corresponding.
In the present embodiment, utilize the maximal work torque arithmetic model of above-mentioned acquisition, the maximal work moment of torsion that the axial tension being likely applied to this list shoulder drilling tool joint place is corresponding can be obtained, can control, to single shoulder drilling tool joint externally applied forces, to be prevented effectively from and drilling tool fracture or invalid occurs in drilling process according to this moment of torsion.
The defining method of the operation torque of single shoulder drilling tool joint that the present embodiment provides, by accurately measuring, calculate acquisition maximal work torque arithmetic model according to single shoulder drilling tool joint, then pass through this model calculate it is to be appreciated that maximal work moment of torsion corresponding to axial tension, it is used for instructing spudder to make, can fully reflect the stress distribution feature of reality, determine single shoulder drilling tool joint maximal work moment of torsion accurately, effectively reduce losing efficacy the accident caused due to tool joint in drilling well.
Fig. 2 is the flow chart of the determination embodiment of the method two of the maximal work moment of torsion of list shoulder drilling tool joint of the present invention, as in figure 2 it is shown, on the basis of above-described embodiment, the specific implementation process of S101 is:
S201: described single shoulder drilling tool joint is chosen measurement point and carries out material properties test, obtain the mechanical property parameters of described single shoulder drilling tool joint material.
In the present embodiment, for the drilling tool that certain well uses, the material of its separate unit shoulder grafting head is carried out performance test, it is thus achieved that corresponding mechanical property parameters.
S202: obtain the structural parameters of described single shoulder drilling tool joint.
S203: set up the 3-D geometric model of described single shoulder drilling tool joint according to described structural parameters, and described 3-D geometric model carries out FEM meshing is at least ten ten thousand unit.
In the present embodiment, the single shoulder drilling tool joint 3-D geometric model built up is carried out FEM meshing, the principle adopted is that ridge part arranges that fine and closely woven hexahedral mesh is to ensure computational accuracy, other position grid are thinner, the concrete more many precision of this grid are more high, and concrete choosing can be chosen according to practical situation.
S204: the described 3-D geometric model according to described mechanical property parameters and finite elements, calculates the element stress obtaining described single shoulder drilling tool joint.
Concrete, according to the single shoulder drilling tool joint unit governing equation described based on Lagrange and Green strain tensor increment formula, obtains the finite element governing equation of list shoulder drilling tool joint; According to described mechanical property parameters and FEM (finite element) model, adopt the deformation of each unit of the described finite element governing equation described single shoulder drilling tool joint of acquisition; Deformation according to each described unit and the material constitutive relation acquiring unit stress of described single shoulder drilling tool joint.
In the present embodiment, utilize Finite Element Method that above-mentioned 3-D geometric model is solved, adopt the single shoulder drilling tool joint unit governing equation described based on Lagrange of the prior art, and the incremental form of strain tensor, obtain the finite element governing equation of single shoulder drilling tool joint, get the deformation of each unit further combined with prior art, the constitutive relation further according to material gets element stress.
S205: according to described element stress and described mechanical property parameters, obtain the maximal work moment of torsion that each axial tension arranged is corresponding.
In the present embodiment, according to above-mentioned finite element governing equation the maximal work moment of torsion according to the single shoulder drilling tool joint measured when the mechanical property parameters that material obtains can obtain different axial tensions.
S206: the recommended practice (APIRECOMMENDEDPRACTICE7G according to existing American Petroleum Institute (API) design of drill Yu operating limit, SIXTEENTHEDITION, AUGUST1998--AmericanPetroleumInstituteRecommendedPractic eforDrillStemDesignandOperatingLimits, it is called for short: APIRP7G) the maximal work moment of torsion that zero axial tension of the described single shoulder drilling tool joint of standard acquisition is corresponding, and verify whether correct according to the maximal work moment of torsion that described element stress is corresponding with zero axial tension that described mechanical property parameters obtains.
In the present embodiment, single shoulder drilling tool joint maximal work moment of torsion when utilizing existing document correlation computations formula can obtain zero axial tension, its maximal work moment of torsion corresponding with zero axial tension obtained according to aforesaid way, compare, comparing with default error rate, the maximal work moment of torsion being identified through aforesaid way acquisition is correct.
S207: if correct, then axial tension and described maximal work moment of torsion according at least five, obtain the described maximal work torque arithmetic model of described single shoulder drilling tool joint.
The defining method of the operation torque of single shoulder drilling tool joint that the present embodiment provides, single shoulder drilling tool joint maximal work torque is quickly determined according to actual tensile load, to select suitable operation torque size, it is to avoid single shoulder drilling tool joint lost efficacy or single shoulder drilling tool joint place occurs that fracture causes that the fall complex situations of well of drilling tool occur.
On the basis of the embodiment shown in above-mentioned Fig. 1 and Fig. 2, after S102, it is also possible to according at least one axial tension described and at least one corresponding described maximal work moment of torsion, obtain the area of safety operaton of this list shoulder drilling tool joint.
In the present embodiment, concrete maximal work moment of torsion when can obtain multiple axial tension, this value is utilized to set up axial tension and the sign picture of maximal work moment of torsion, distinguish drilling well work axis to the place of safety in the corresponding relation of pulling force and maximal work moment of torsion, alert zone and unsafe region, be used for instructing actual job.
On the basis of above-mentioned all embodiments, below special as one example the defining method of the operation torque of single shoulder drilling tool joint of the present invention is illustrated. The defining method of the maximal work moment of torsion of list shoulder drilling tool joint of the present invention is described in detail by the present embodiment for separate unit shoulder drilling tool in the drill string being applied to a certain block x well (a kind of separate unit shoulder bypass valve), and the investigation degree of depth is 5000m. Specific implementation is as follows:
First, by the geometrical structure parameter of this list shoulder drilling tool joint obtained, selected single shoulder drilling tool joint being carried out Geometric Modeling, including the feature such as lead angle of ridge, the main structure parameters of this list shoulder drilling tool joint is as shown in table 1. Fig. 3 is the 3-D geometric model schematic diagram of single shoulder drilling tool joint. Geometrical structure parameter needed for modeling can be oneself pass through instrument to measure acquisition, it is possible to adopts producer to measure the data of offer.
| External diameter/mm | 120 | Thread taper | 1:12 |
| Internal diameter/mm | 50.8 | Pitch/mm | 6.35 |
The structural parameters of the single shoulder drilling tool joint of table 1
Fig. 4 is single shoulder drilling tool joint three-dimensional finite element model schematic diagram, as shown in Figure 3, shown in Fig. 4, the single shoulder drilling tool joint 3-D geometric model built up is carried out FEM meshing, the principle adopted is that ridge part arranges that fine and closely woven hexahedral mesh is to ensure computational accuracy, other position grid are thinner, in the present embodiment, amount to and are divided into 33.27 ten thousand grid cells.
For the drilling tool that x well uses, first the material of this list shoulder drilling tool joint is carried out performance test, it is thus achieved that corresponding mechanical property parameters.
In the present embodiment at the number of test points of this list shoulder drilling tool joint material selection up to 902 (especially, the number of the test point chosen when for single shoulder drilling tool joint material properties test is not less than 20), concrete test mode is with reference to prior art, the single shoulder drilling tool joint performance parameter finally obtained is: this list shoulder drilling tool joint material therefor is isotropism elastic-plastic material, and elastic modelling quantity is 2.06 �� 105MPa, Poisson's ratio is 0.29, and maximum tension strain is 0.192. Table 2 lists a part of true stress-plastic strain data (only listing 22 points here) of the material of this list shoulder drilling tool joint.
Especially, it is necessary to considering the impact of the thread compound last containing 40-60% weight percent zinc powder, the coefficient of friction (included between screw thread and between circular bead surface) between mating surface takes 0.08.
Part true stress-plastic strain the data of this list shoulder drilling tool joint material of table 2
Secondly, adopt Finite Element Method that above-mentioned 3-D geometric model is solved. The application principle of virtual work, the single shoulder drilling tool joint unit governing equation described based on Lagrange is:
Wherein, S is Kirchoff&apos (Kirchhoff) stress tensor; E is Green (Green) strain tensor; F is the power load vector on each grid cell surface; �� u is virtual displacement; V is the volume of the initial configuration of single shoulder drilling tool joint; A is the surface area of the initial configuration of single shoulder drilling tool joint.
Green (Green) strain tensor E adopts incremental form to obtain: �� E=B �� ue, �� u=N �� ue
Wherein, B is element strain matrix, ueFor modal displacement, N is unit shape function.
Consider the arbitrariness that modal displacement changes, the governing equation of all unit be combined, obtain the finite element governing equation of this list shoulder drilling tool joint:
Wherein, cTExpanding the rank transposed matrix to boolean (Boolean) the matrix c of this list shoulder drilling tool joint structural system modal displacement for Displacement of elemental node, S is Kirchoff&apos stress tensor, BTFor the transposed matrix of element strain matrix B, NTFor the transposed matrix of unit shape function N, V is the volume of the initial configuration of single shoulder drilling tool joint; A is the surface area of the initial configuration of single shoulder drilling tool joint. The differential of the cell list area of the initial configuration of the mono-shoulder drilling tool joint of dA, dV is the differential of the unit volume of the initial configuration of single shoulder drilling tool joint.
According to above-mentioned finite element governing equation, obtain the modal displacement of this separate unit shoulder drill bit each unit, the unit strain of each unit can be obtained according to geometric equation of the prior art, the element stress of each unit can be calculated subsequently according to the constitutive relation of material.
Again, adopt above-mentioned finite element governing equation, and using the criterion whether plastic strain (strain of aforesaid maximum tension) corresponding during material failure in tension test in the material properties test that this separate unit is takeed on drill bit lost efficacy as screw thread, axially different pulling force condition can be obtained and place an order the maximal work moment of torsion of shoulder drilling tool joint.
And the maximal work moment of torsion of the shoulder drilling tool joint that places an order according to the multiple axial tension conditions of aforesaid way acquisition, and according to corresponding axial tension and maximal work moment of torsion obtain axial tension be maximal work moment of torsion when zero apply curve and axial tension 3200kN time maximal work moment of torsion apply curve, Fig. 5 a is axial tension is that maximal work moment of torsion when zero applies curve; Fig. 5 b is that maximal work moment of torsion during axial tension 3200kN applies curve, concrete curve is as shown in figure 5 a and 5b, when operation torque is loaded into certain value, owing to material yield lost efficacy, moment of torsion cannot continue up to load, and starts fluctuation occur, after several secondary undulations, single shoulder drilling tool joint lost efficacy, and moment of torsion moment reduces to zero. Owing to lower yield limit is relatively stable, take fluctuation section low spot as the maximal work moment of torsion of tool joint under this hole condition.
Such as: table 3 lists the maximal work moment of torsion that within the scope of 0��3846kN axial tension, 10 axial tension points are corresponding.
The maximal work moment of torsion that 10 axial tension points of this list shoulder drilling tool joint of table 3 are corresponding
Single shoulder drilling tool joint maximal work moment of torsion when utilizing APIRP7G standard can obtain zero axial tension is 28.86kN m, its with table 3 in the error of 29.42kN m be only 1.9%, thus result accurate and effective in indirect verification table 3.
Data in his-and-hers watches 3 are fitted, and find out this axial tension and the corresponding relation of maximal work moment of torsion, can obtain this list shoulder drilling tool joint maximal work torque arithmetic model:
M=-10-9*T3+5*10-6*T2-0.0076*T+30.463;
Wherein, M represents maximal work moment of torsion, and T represents axial tension, and the unit of operation torque is the unit of kN m axial tension is kN, and correlation coefficient 0.9865, Fig. 6 is respectively axial tension and maximal work torque relationship curve.
Finally, according to above-mentioned gained list shoulder drilling tool joint maximal work torque arithmetic model, consider the safety coefficient of 1.2, define the work safety district of this list shoulder drilling tool joint, alert zone and unsafe region, Fig. 7 is the subregion schematic diagram of axial tension and maximal work moment of torsion, as shown in Figure 7, in actual applications can by different colors to work safety district, alert zone and unsafe region make a distinction and identify, if work safety district (in Fig. 7 foot) is green, work alert zone (zone line in Fig. 7) is yellow, unsafe region (topmost in Fig. 7) is red. for having single shoulder drilling tool joint of same size, it may be determined that maximal work moment of torsion when going out arbitrary actual axle to pulling force.
For single shoulder drilling tool joint that x well in the present embodiment uses, when well depth is 3000m, maximum axial position in this list shoulder drilling tool joint is at well head, about 840kN, according to Fig. 7, it can be seen that ground drives the maximum working torque that drilling tool can be applied by equipment (as top is driven) not can exceed that 27.01kN m.
For same well, if meeting card at 3000m place drill bit, during unfreezing operation, top is driven to the load that lifts up of drilling tool is 1600kN, then pass through Fig. 7, it is possible to quickly determine that maximum ground moment of torsion not can exceed that 24.22kN m. When adopting less than 20.18kN m operation torque, job safety; When the operation torque adopted is within the scope of 20.18kN m��24.22kN m, selected service load falls into alert zone, now it should be noted that, and suitably turn operation torque down; When the operation torque adopted is more than 24.22kN m, operation now is in unsafe condition, it is necessary to be adjusted immediately. Compared with single shoulder drilling tool joint of same size, when same axial tensile load, single shoulder drilling tool joint has higher maximal work moment of torsion.
Drilling tool in the present invention is composition drill string the downhole tool that can bear moment of torsion, such as drilling rod, drill collar, adapter, regulator, amortisseur, bumper jar, bypass valve etc. Method provided by the invention is utilized can quickly to determine single shoulder drilling tool joint maximal work torque according to actual tensile load, to select suitable operation torque size, it is to avoid single shoulder drilling tool joint lost efficacy or single shoulder drilling tool joint place occurs that fracture causes that the fall complex situations of well of drilling tool occur.
Utilize the method provided by the invention equally can according to possible torque, it is determined that the hook limit lifts up load. Embodiment of the present invention modeling includes the lead angle etc. of ridge, adopt Three-dimensional elastoplastic finite element analysis, consider torque wrench moment, axial tension and operation torque effect to place an order the stress characteristic of shoulder drilling tool joint, just can determine that the single shoulder drilling tool joint maximal work moment of torsion more conforming to realistic well condition. Placed an order the calculating of shoulder drilling tool joint maximal work moment of torsion by the test of actual joint material performance and one group of axially different tensile load effect, and result of calculation is carried out fitting of a polynomial, obtain the maximal work torque arithmetic model of single shoulder drilling tool joint, draw out realistic well condition condition on this basis to place an order the maximal work moment of torsion plate of shoulder drilling tool joint, such that it is able to quickly determine that actual complex load working condition places an order the maximal work moment of torsion of shoulder drilling tool joint, in order to better Instructing manufacture operation.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (9)
1. the defining method of the maximal work moment of torsion of a single shoulder drilling tool joint, it is characterised in that including:
Structural parameters according to single shoulder drilling tool joint to be measured, obtain the maximal work torque arithmetic model of described single shoulder drilling tool joint;
According to described maximal work torque arithmetic model, obtaining the maximal work moment of torsion that each axial tension pre-set of described single shoulder drilling tool joint is corresponding, described axial tension is at least one, and described axial tension and described maximal work moment of torsion one_to_one corresponding.
2. defining method according to claim 1, it is characterised in that after the maximal work moment of torsion that each axial tension pre-set of the described single shoulder drilling tool joint of described acquisition is corresponding, described method also includes:
According to described maximal work torque arithmetic model, obtain the area of safety operaton of single shoulder drilling tool joint.
3. defining method according to claim 2, it is characterised in that the described structural parameters according to single shoulder drilling tool joint to be measured, obtains the maximal work torque arithmetic model of described single shoulder drilling tool joint, including:
Described single shoulder drilling tool joint is chosen measurement point and carries out material properties test, obtain the mechanical property parameters of described single shoulder drilling tool joint material.
4. defining method according to claim 3, it is characterised in that the described structural parameters according to single shoulder drilling tool joint to be measured, obtains the maximal work torque arithmetic model of described single shoulder drilling tool joint, also includes:
Obtain the structural parameters of described single shoulder drilling tool joint;
Set up the 3-D geometric model of described single shoulder drilling tool joint according to described structural parameters, and described 3-D geometric model carries out FEM meshing is at least ten ten thousand unit;
Described 3-D geometric model according to described mechanical property parameters and finite elements, calculates the element stress obtaining described single shoulder drilling tool joint;
According to described element stress and described mechanical property parameters, obtain the maximal work moment of torsion that each axial tension arranged is corresponding;
Obtain the maximal work moment of torsion corresponding to zero axial tension of described single shoulder drilling tool joint according to existing APIRP7G standard, and verify whether correct according to the maximal work moment of torsion that described element stress is corresponding with zero axial tension that described mechanical property parameters obtains;
If correct, then axial tension and described maximal work moment of torsion according at least five, obtain the described maximal work torque arithmetic model of described single shoulder drilling tool joint.
5. defining method according to claim 4, it is characterised in that described calculating obtains the element stress of described single shoulder drilling tool joint according to described mechanical property parameters, including:
Increment formula according to the single shoulder drilling tool joint unit governing equation described based on Lagrange and Green strain tensor, obtains the finite element governing equation of single shoulder drilling tool joint;
According to described mechanical property parameters, adopt the deformation of each unit of the described finite element governing equation described single shoulder drilling tool joint of acquisition;
Deformation according to each described unit and the material constitutive relation acquiring unit stress of described single shoulder drilling tool joint.
6. defining method according to claim 5, it is characterised in that the mechanical property parameters of described single shoulder drilling tool joint includes the elastic modelling quantity of described single shoulder drilling tool joint, Poisson's ratio and maximum tension strain.
7. defining method according to claim 6, it is characterised in that the finite element governing equation of described single shoulder drilling tool joint is:
Wherein, cTExpanding the rank transposed matrix to the Boolean matrix c of this list shoulder drilling tool joint structural system modal displacement for Displacement of elemental node, S is Kirchoff&apos stress tensor, BTFor the transposed matrix of element strain matrix B, NTFor the transposed matrix of unit shape function N, V is the volume of the initial configuration of single shoulder drilling tool joint; A is the surface area of the initial configuration of single shoulder drilling tool joint. The differential of the cell list area of the initial configuration of the mono-shoulder drilling tool joint of dA, dV is the differential of the unit volume of the initial configuration of single shoulder drilling tool joint.
8. the defining method according to any one of claim 1 to 7, it is characterised in that the described maximal work torque arithmetic model of described single shoulder drilling tool joint is:
M=-10-9*T3+5*10-6*T2-0.0076*T+30.463;
Wherein, M represents maximal work moment of torsion, and T represents axial tension.
9. defining method according to claim 8, it is characterised in that the unit number that described 3-D geometric model carries out FEM meshing is 33.27 ten thousand; The number of the test point chosen when described single shoulder drilling tool joint material properties test is not less than 20.
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| CN110397431A (en) * | 2019-05-15 | 2019-11-01 | 上海大学 | A kind of anti-breaking method for early warning of tool joint |
| CN111411903A (en) * | 2020-03-17 | 2020-07-14 | 上海大学 | Method for determining secondary shoulder clearance of double-shoulder drill rod joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110397431A (en) * | 2019-05-15 | 2019-11-01 | 上海大学 | A kind of anti-breaking method for early warning of tool joint |
| CN111411903A (en) * | 2020-03-17 | 2020-07-14 | 上海大学 | Method for determining secondary shoulder clearance of double-shoulder drill rod joint |
| CN111811807A (en) * | 2020-08-25 | 2020-10-23 | 中国石油天然气集团有限公司 | Method for measuring buckling limit torque of special threaded joint of oil casing |
| CN113324862A (en) * | 2021-07-13 | 2021-08-31 | 广东省医疗器械质量监督检验所 | Simulated clinical fatigue resistance testing method and device for peritoneal dialysis external connection tube |
| CN113324862B (en) * | 2021-07-13 | 2022-05-06 | 广东省医疗器械质量监督检验所 | Simulated clinical fatigue resistance testing method and device for peritoneal dialysis external connection tube |
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