CN102466565A - Method for testing rock breaking performance of petroleum drill bit - Google Patents
Method for testing rock breaking performance of petroleum drill bit Download PDFInfo
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- CN102466565A CN102466565A CN2010105586389A CN201010558638A CN102466565A CN 102466565 A CN102466565 A CN 102466565A CN 2010105586389 A CN2010105586389 A CN 2010105586389A CN 201010558638 A CN201010558638 A CN 201010558638A CN 102466565 A CN102466565 A CN 102466565A
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Abstract
The invention discloses a method for testing the rock breaking performance of a petroleum drill bit. The method for testing the rock breaking performance of the petroleum drill bit comprises the steps of: installing a sensor and rocks; building a shaft bottom, finally carrying out petroleum drill bit rock breaking experiments under different parameter conditions so as to acquire the rock breaking performance of the petroleum drill bit under different parameter conditions, and the like. The method disclosed by the invention can be used for rapidly testing the rock breaking performance of the petroleum drill bit, and has the advantages of being high in test precision and simple in testing steps, reducing manual cost and further reducing the cost of the entire test.
Description
Technical field
The present invention relates to the method for testing of the broken lithology ability of a kind of oil bit.
Background technology
Oil bit is the main tool of ravelly ground rock, is the important means that improves ROP in the petroleum drilling engineering, reduces drilling cost.High-performance drill bit Products Development all is to be based upon on theoretical and the experimental study basis with research; Head dip test mainly is to carry out broken Different Strata rock test of full drill bit and the broken rock test of drill bit gear ring compound motion; Full head dip test mainly is the ROP and the broken shaft bottom of test drill bit broken different rocks under certain drilling parameter condition; The motion and the broken rock situation of the broken rock test simulation drill teeth of drill bit gear ring compound motion are through the drill bit in the test macro acquisition test process and gear ring rotating speed, drill bit displacement, the pressure of the drill and torque signal.
The test that research is carried out to drill bit at present mainly is the broken rock test of full gauge bit test and drill bit gear ring compound motion, and full head dip test mainly is to detect the Fracture law that new drill creeps into the Different Strata rock; The broken rock test of drill bit gear ring compound motion mainly is the Fracture law of research different drill structure parameters, flank of tooth structure and drilling parameter and formation rock.
The test macro of the broken rock test of existing full head dip test and drill bit gear ring compound motion mainly is by drill bit, gear wheel and gear ring rotational speed pulse signal in sensor, tachometry appearance and the data collecting card acquisition test process; By drill bit displacement, the pressure of the drill and the simulation torque signal in sensor, dynamic strain indicator and the data collecting card acquisition test process.
But along with further in-depth of drill bit research; A lot of problems that have existing head dip test test macro can not satisfy the needs of present stage drill bit research and new product development; Such as: the motion and the stressing conditions of research drill bit and 5 teeth; The analog quantity channel of existing two 8 channel data capture cards is not enough, can not satisfy the expanded function of test needs comprehensively; Because the influence of hydraulic system, motor and environment etc., the signal of dynamic strain indicator collection contains a large amount of noises, and the test figure accuracy is not high; Hardware device such as dynamic strain indicator and data collecting card costs an arm and a leg, and the test system hardware cost is high.Therefore press for and set up the head dip test test macro of a cover based on modern measuring technology; Can gathering the motion and the stressing conditions of drill bit and each tooth fast, accurately, in real time, thereby important research technique is provided for the new product development of drill bit and scientific design.
Motion state when oil bit is worked in the shaft bottom and stress are quite complicated.Drill bit moves in the shaft bottom; Except drill bit around self axis rotatablely move as CW with gear wheel around the bit leg axis is done counterclockwise to rotatablely move; Also has the slip of axial longitudinal vibration and gear wheel, the compound motion that these several kinds motions take place simultaneously, combine when being drilling well.Oil bit is fractured rock under impact, crushing and the slip shear effect that above-mentioned compound motion produced.
Can produce extensional vibration when oil bit creeps into, in each vibration, compression lower drilling string when drill bit is up, when drill bit is descending then drill string recover former length, its potential energy is converted into the dynamic loading of drill bit.During drill bit work; The power that tooth affacts on the rock has static load (being added in the pressure of the drill on the drill bit) and dynamic loading (drill bit and lower drilling string are quickened to descend and the dynamic load of generation); When that is to say tooth impact grinding rock, the reacting force that drill bit receives rock also equals static load and dynamic loading sum.
Drill bit is when underground work, except receiving vertical static load and dynamic loading, because drill string rotating also will receive torsional interaction.When the pressure of the drill is bigger, tooth wedging rock is darker, and especially tooth slides in the shaft bottom when big, and the moment of torsion that drill bit bears is bigger.When oil bit is worked in the shaft bottom; Because drill bit produces longitudinal vibration in the shaft bottom; Make drill string constantly compression and extension; Lower drilling string passes to tooth to this periodic elastic deformation energy, produces impact, the granulitization of tooth to rock, and this crumbling method is one of main mode of oil bit fractured rock.
In oil bit when work,, because the project organization of drill bit and the influence of stratum frictional resistance produce slip, rotating speed is faster, slippage is big more, and is big more to the shearing-crushing of rock, thereby passes through the slip shear bottom rock of tooth, the raising crushing efficiency.
Can find out in the research process of drill bit the brief analysis of oil bit according to above-mentioned, must analyze the pressure of the drill, torsional interaction and drill bit that the broken rock motion of drill bit born and the rotating speed of gear wheel effectively in shaft bottom motion, stressed and fractured rock situation.
Along with the petroleum drilling degree of depth increases and formation rock complicated; Research work according to Different Strata rock characteristics exploitation high-performance drill bit is more urgent, at present the control of existing head dip test and the demand that test macro can not satisfy the research and development of present stage drill bit.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art; The method of testing of the broken lithology ability of a kind of oil bit is provided; The method of testing of the broken lithology ability of this oil bit can record the broken lithology ability of oil bit fast, and measuring accuracy is high, and testing procedure is simple; Reduce cost of labor, and then reduced whole testing cost.
The object of the invention is realized through following technical proposals: the method for testing of the broken lithology ability of a kind of oil bit may further comprise the steps:
(a) at first sensor installation on oil bit body and lower rotary table;
(b) install again on the lower rotary table that rock is fixed on test stand;
(c) start clear water, thyristor speed control device, hydraulic control panel then respectively; The shaft bottom is made in the slow-speed of light pressure; The shaft bottom is made the back the pressure of the drill, moment of torsion and drilling depth is marked zero, and adjusts dynamic strain indicator, oil bit and gear wheel tachometry appearance, data acquisition system (DAS);
(d) carry out the broken rock test of oil bit under the different parameters condition at last, thereby obtain the broken lithology ability of oil bit under the different parameters condition.
In the said step (a), sensor is a magnetic core sensor.
In the said step (a), number of sensors is 4.
In the said step (c), broken lithology can comprise: the rotating speed of the pressure of the drill, moment of torsion, ROP, drill speed, each gear wheel and drill bit is BHP when.
The time interval of taking of said the pressure of the drill, moment of torsion and drilling depth parameter was 1 second, and drill bit and gear wheel rotate the pulse signal that produces and gather at any time.
In sum, the invention has the beneficial effects as follows: can record the broken lithology ability of oil bit fast, and measuring accuracy is high, testing procedure is simple, has reduced cost of labor, and then has reduced whole testing cost.
Embodiment
Below in conjunction with embodiment, the present invention is done further detailed description, but embodiment of the present invention is not limited only to this.
Embodiment:
The method of testing of the broken lithology ability of a kind of oil bit that the present invention relates to, its concrete steps are following:
(a) at first sensor installation on oil bit body and lower rotary table;
(b) install again on the lower rotary table that rock is fixed on test stand;
(c) start clear water, thyristor speed control device, hydraulic control panel then respectively; The shaft bottom is made in the slow-speed of light pressure; The shaft bottom is made the back the pressure of the drill, moment of torsion and drilling depth is marked zero, and adjusts dynamic strain indicator, oil bit and gear wheel tachometry appearance, data acquisition system (DAS);
(d) carry out the broken rock test of oil bit under the different parameters condition at last, thereby obtain the broken lithology ability of oil bit under the different parameters condition.
In the said step (a), sensor is a magnetic core sensor.
In the said step (a), number of sensors is 4.
In the said step (c), broken lithology can comprise: the rotating speed of the pressure of the drill, moment of torsion, ROP, drill speed, each gear wheel and drill bit is BHP when.
The time interval of taking of said the pressure of the drill, moment of torsion and drilling depth parameter was 1 second, and drill bit and gear wheel rotate the pulse signal that produces and gather at any time.
Principle of the present invention is: ROP and the broken shaft bottom of under the condition of drilling parameters such as given the pressure of the drill and rotating speed, measuring the broken different rocks of drill bit.Drill bit the pressure of the drill, torque measurement are on thin ancient piece of jade, round, flat and with a hole in its centre joint, to paste foil gauge, and drilling depth is to use displacement transducer, all pass through dynamic strain indicator, data collecting instrument and computing machine then and obtain.The gear wheel tachometric survey then is through being fixed on the magnetic core sensor (surveying the cone outer row tooth) on the frame of the bit; Promptly whenever the top of one piece of cone outer row tooth process magnetic core sensor; The latter just sends a pulse signal; These signals obtain through drill bit and gear wheel tachometry appearance, data collecting instrument and computing machine, and it then is through being fixed on the magnetic core sensor on the lower rotary table that drill speed is measured, and survey the copper sheet that lower rotary table pastes and obtain.Applying drill bit the pressure of the drill then is to realize that through the deadweight of head dip test frame and the size of adjusting hydraulic control panel control oil cylinder oil inlet quantity it is to realize through thyristor speed control device, direct current generator, governing box and test stand lower rotary table that drill speed is regulated.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction, and every foundation technical spirit of the present invention, any simple modification, equivalent variations to above embodiment did all fall within protection scope of the present invention.
Claims (5)
1. the method for testing of the broken lithology ability of oil bit is characterized in that, may further comprise the steps:
(a) at first sensor installation on oil bit body and lower rotary table;
(b) install again on the lower rotary table that rock is fixed on test stand;
(c) start clear water, thyristor speed control device, hydraulic control panel then respectively; The shaft bottom is made in the slow-speed of light pressure; The shaft bottom is made the back the pressure of the drill, moment of torsion and drilling depth is marked zero, and adjusts dynamic strain indicator, oil bit and gear wheel tachometry appearance, data acquisition system (DAS);
(d) carry out the broken rock test of oil bit under the different parameters condition at last, thereby obtain the broken lithology ability of oil bit under the different parameters condition.
2. the method for testing of the broken lithology ability of a kind of oil bit according to claim 1 is characterized in that in the said step (a), sensor is a magnetic core sensor.
3. the method for testing of the broken lithology ability of a kind of oil bit according to claim 1 is characterized in that in the said step (a), number of sensors is 4.
4. the method for testing of the broken lithology ability of a kind of oil bit according to claim 1, it is characterized in that in the said step (c), broken lithology can comprise: the rotating speed of the pressure of the drill, moment of torsion, ROP, drill speed, each gear wheel and drill bit is BHP when.
5. the method for testing of the broken lithology ability of a kind of oil bit according to claim 4 is characterized in that the time interval of taking of said the pressure of the drill, moment of torsion and drilling depth parameter was 1 second, and drill bit and gear wheel rotate the pulse signal that produces and gather at any time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105586389A CN102466565A (en) | 2010-11-18 | 2010-11-18 | Method for testing rock breaking performance of petroleum drill bit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105586389A CN102466565A (en) | 2010-11-18 | 2010-11-18 | Method for testing rock breaking performance of petroleum drill bit |
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| CN102466565A true CN102466565A (en) | 2012-05-23 |
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| CN2010105586389A Pending CN102466565A (en) | 2010-11-18 | 2010-11-18 | Method for testing rock breaking performance of petroleum drill bit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698122A (en) * | 2014-01-08 | 2014-04-02 | 地质矿产部无锡钻探工具厂 | Measuring device and method for rock crushing effect of diamond drill bit |
| CN113252437A (en) * | 2021-06-16 | 2021-08-13 | 西南石油大学 | Dynamic rock breaking efficiency evaluation method |
-
2010
- 2010-11-18 CN CN2010105586389A patent/CN102466565A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698122A (en) * | 2014-01-08 | 2014-04-02 | 地质矿产部无锡钻探工具厂 | Measuring device and method for rock crushing effect of diamond drill bit |
| CN113252437A (en) * | 2021-06-16 | 2021-08-13 | 西南石油大学 | Dynamic rock breaking efficiency evaluation method |
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Application publication date: 20120523 |