The way to determine the health of the rock cutting tool
(57) Abstract:The invention relates to the field of control parameters of drilling and can be used for diagnostics of the rock cutting tool. The method involves the measurement of pressure fluctuations of the washing liquid on the bit and fluctuations of the axial load on the bit, select the current criteria of efficiency, setting their reference values and determining the health of a rock cutting tool by comparing the current values with their reference values. What's new is that at any point in the drilling define the Gini coefficient GPpressure fluctuations of the washing liquid and the Gini coefficient GQfluctuations of the axial load. As criteria of health accept the current values of TP= 1 - GPand TQ= 1 - GQthe minimum wear of rock cutting tools and, consequently, its maximum efficiency correspond to the maximum values of these criteria. As reference values take TPFL= TQFL= 1. The invention improves the accuracy of estimation of technical condition of the rock instrumental rock destruction tool. 3 Il., table 2. The invention relates to the field of control and measurement parameters in the process of drilling oil and gas wells and can mainly be used when diagnosing the health of a rock cutting tool with a view to its effective testing, as well as in the development of automated control systems of the drilling process.There is a method of determining the degree of wear of rock cutting tool, consisting in the measurement of the pulsation pressure of the flushing fluid and its subsequent transformation into a spectrum of pressure fluctuations, and the criterion of wear of rock cutting tool is received bandwidth normalized spectral density, and the wear limit is characterized by the absence of the dominant frequency. C. 1427059, USSR, E. 21 In 45/00, B. I. 36, 1988).Along with the indisputable advantages of the spectral analysis has certain limitations. First, the original signal is replaced periodically. When Fourier transformation of the time-varying process parameters for the entire test signal obtained averaged coefficients. Therefore, methods based on spectral analysis, does not allow for when conducting vibrodiagnostics research.Known way to determine the health of the rock cutting tool by registering the pressure fluctuations of the washing liquid in the discharge line and calculate the value of the criterion of its efficiency.with. 1800011, USSR, E. 21 In 45/00, B. I. 9, 1993).In this way calculate the correlation dimension at the beginning and during the drilling process, determine the health criteria and its reference value for each performance stack drilling and border uptime identify with time to reach a criterion of its reference values.The disadvantage of this method is rather complicated procedure of determining health criteria and, accordingly, the low accuracy of estimation of the technical state of the rock cutting tool during operation, because there is only one option.Closest to the present invention is a method of determining the health of a rock cutting tool.with. 1102906, USSR, E. 21 In 45/00, B. I. 26, 1984), including the measurement of pressure fluctuations of the washing liquid on the bit and fluctuations of the axial load on the bit, select the current criteria of efficiency, setting their reference values and coupon values. The current criteria for the operability of the prototype using the coefficients of variation of a large number of measured parameters, including the cost of power for drilling, ROP, and so on, taking into account the level of importance and the digital values of the averaging interval.The known method is difficult and not precise enough to determine the state of rock cutting tool in the process of drilling wells.The present invention solves the technical problem of improving the accuracy of evaluation of technical condition of the rock cutting tool (drill bit) in operation at simplification by reducing the number of controlled parameters.The problem is solved in that in the method of determining the health of a rock cutting tool, including the measurement of pressure fluctuations of the washing liquid on the bit and fluctuations of the axial load on the bit, select the current criteria of efficiency, setting their reference values and determining the health of a rock cutting tool by comparing the current values with their reference values, determine the Gini coefficient GPpressure fluctuations of the washing liquid is topolinski accept the current values of TP= 1 - GPand TQ= 1 - GQthe minimum wear of rock cutting tools and, consequently, its maximum efficiency correspond to the maximum values of these criteria, and as reference values take TPFL= TQFL=1.The Gini coefficient is used, for example, in the economy for measuring inequality in the distribution of the total social income and levels of living of different segments of the population using the Lorenz curve ("Science and life", 2, 1998, S. 60). The algorithm for determining the Gini coefficient, which includes the construction of the Lorenz curve or line distribution, described in the work (McConnell, Campbell R., Brue, Stanley L., Economics: Principles, problem and policy. - Lane. from English. - M.: Republic, 1993. - S. 276-278). The greater the deviation of the Lorenz curve from the ideal curve, the greater the Gini coefficient will be close to unity, i.e., the greater the inequalities in the distributions. Similarly, you can define inequality in the measurement of pressure fluctuations of the washing liquid, the oscillation of the axial load and the change of the technical condition of the rock cutting tool at an arbitrary point in drilling wells. Pomyvochnoj fluid and fluctuating axial load on the bit (Q), - the number of these values at the beginning and end of each chipping (N). If between the parameters of the drilling process and the technical condition of the bit, there was an unambiguous and uniform dependence, for example 20% wear of the bit corresponded to well-defined values, a 40% depreciation - other specific values, this relationship would reflect the "ideal curve" of Fig.1 this is a direct OE. In fact there is a different picture, represented by the curve OABCDE or the so-called Lorenz curve. The greater the deviation of the Lorenz curve from the line OE, the lower the correlation between the analyzed indicators. The area of the shape ABCDEO is an integral indicator of differences between the actual distribution is completely unambiguous and uniform.For definitions of the Gini coefficient (G) should be divided area S1between the cut OE and the Lorenz curve to the area of S2triangle OFE:
< / BR>the area of a triangle OEF (Fig.1), this value is constant, based on the definition of the Gini coefficient on the Lorenz curve ("Science and life", 2, 1998);
the area of the shape OABCDEF;
Xi=Ni(%), YNi=Qi(%).The calculation of the Gini coefficient G, and the criterion for the decision management process of drilling, in particular to determine the technical condition and, accordingly, the operability of the rock cutting tool.It is assumed that prior to drilling the bit is in equilibrium-ordered state. The drilling process and, accordingly, the change of the technical condition of the bit leads to the imbalance of the system, the increase of the Gini coefficient G and the reduction of health criteria bit So Therefore, when drilling the technical condition of the bit must satisfy the condition of a system in which no growth of the Gini coefficient G, and the health criteria T is close to the reference value of the unit that will allow you to prevent an accident with a chisel. Thus, this approach allows a certain degree of accuracy to interpret the technical condition of the bit and to diagnose, for example, the transition of the technical condition of rock cutting tool from nearly new (1P1) up to a maximum of depreciated (IN4P3).In Fig. 2 shows a device for implementing the method of determining the health of a rock cutting tool during drilling control 5, the display unit 6, the control unit 7.The proposed method is implemented as follows. At the wellhead are two pressure - two receiver signals. Sensor 1 is installed on the fixed end of the pulley rope or hydraulic weight indicator for measuring oscillations of axial load on the bit, and sensor 2 on manifolding line to measure the pressure fluctuations of the washing liquid.Further signals, each in its own channel, proceed to block regulation 3, which provides the coordination of the range of the output signals of the sensors with the range of input signals analog-to-digital Converter 4. Block processing and control 5 generates control signals and calculates the Gini coefficient of pressure fluctuations of the washing liquid GPand the Gini coefficient of fluctuation of axial load on the bit GQat any time of drilling. Determine the values of the criteria for the operability of TP= 1 - GPand TQ= 1 - GQspecify reference values criteria TPFLand TQFLwith whom in the drilling process compares the current values of the criteria for the operability of TPand TQ. The display unit 6 is designed for wilt control 7 is used to enter the operator the necessary parameters, changes which accompanied the drilling process, and it changes the type of rock, bit, downhole motor drilling mode, which will allow, for example, when switching to another regime tutu drillability to adjust the current value of the health criteria of rock cutting tool.A specific example of implementation of the proposed method
During the drilling of ten wells in the Bush 849 Samotlor square Nizhnevartovskneftegaz were used 55 bits, which showed different degrees of wear. At an arbitrary time drilling through every 30 were measured with 30 values of pressure fluctuations and axial loads that make up the series for subsequent calculations of the Gini coefficient.In a specific example, consider the calculation of the Gini coefficient of fluctuation of axial load on the bit at the end of the dig for a well 30568, spacing, drilling 413-1047 m, the bit wear -3P3. An example calculation of the Gini coefficient are shown in table 1 and Fig.3; the calculation and its result is below.In the table, the following notation:
N is the number of oscillations of the axial load on the bit obtained from the actual curve by reading through recentf: 100%: 30 = 3,333%;
Qreal- slice record of the fluctuations of the axial load,
presented in the form of statistical series, the numerical values obtained at equal intervals of time (30 s);
Qemphasisstatistical number of the actual curve Qrealpresented in ascending order;
Q% - ordered real curve Qemphasispercentage
< / BR>For example, for N=1
< / BR>< / BR>for N = 6
< / BR>< / BR>< / BR>< / BR>Table 2 shows sample results for the calculation of Gini coefficients and criteria for the operability of the bit during drilling 14636, 14639, 18022, 18061, 30568 and 37172 ON Nizhnevartovskneftegaz.The analysis of the results showed that the minimum wear on the arms (B1and the bit bearing (P1) corresponds to a change in criteria TPwithin 0,996... 0,989 and TQ- 0,956...0,950. With increasing wear of the bit, the criterion of efficiency is reduced within the following limits:
when2P2TP= 0,986...0,981, TQ= 0,924...0,905;
when3P3TP= 0,979...0,967, TQ-0,838...0,811;
when4P3TP= 0,960...0,933, TQ= 0,769...0,697.Thus, the experimental results are taken as reference values triternate criterion TPand TQyou can define the drilling of the first well after 5-6 dolblenii.The proposed method can find application in the development of automated systems of the drilling process, as well as in other areas, where estimation of a technical condition of objects by measuring the oscillation parameters sufficiently long time series, presented in the form of a stationary random process. The way to determine the health of the rock cutting tool, including the measurement of pressure fluctuations of the washing liquid on the bit and fluctuations of the axial load on the bit, select the current criteria of efficiency, setting their reference values and determining the health of a rock cutting tool by comparing the current values with their reference values, wherein define the Gini coefficient GPpressure fluctuations of the washing liquid and the Gini coefficient GQfluctuations of the axial load at any point in the drilling, as criteria of health accept the current values of TP= 1 - GPand TQ= 1 - GQthe minimum wear of rock cutting tools and, respectively, the values of the criteria take TPFL= TQFL= 1.
FIELD: oil and gas well drilling, particularly to create necessary force to be applied to drilling bit during horizontal bore and directional well drilling.
SUBSTANCE: method involves determining engine shaft moment for drilling bit rotation under load applied thereto; determining engine pressure drop corresponding to this moment from downhole drilling motor characteristics; determining pressure at drilling rig standpipe in idle downhole drilling motor operation regime Px as drilling tool with drilling bit and downhole drilling motor is lowered in well to well bottom and after well flushing up to drilling mud parameter equation; applying load to drilling bit by unloading drilling pipe string weight until pressure at standpipe increased by (Pp-Px) value; controlling necessary load to be applied to drilling bit from said value during following well bottom sinking.
EFFECT: increased drilling speed and elimination of expensive complicated bottomhole telemetering system usage.
FIELD: well drilling, particularly to control oil and gas well drilling parameters during well drilling with hydraulic downhole motors.
SUBSTANCE: method involves measuring fluctuation of axial load applied to drilling bit; selecting current operability criteria; setting reference operability criteria values and comparing current operability criteria and reference ones to determine rock-cutting tool operability. Fractal dimensions are calculated with the use of plotted phase curves representing axial load when rock-cutting tool is in current condition D1 and initial drilling time when rock-cutting tool operates in optimal mode D2. Drilling-tool workability criterion is equal to γ=D1/D2. Reference γ values are determined for drilling bit having maximal wear.
EFFECT: increased accuracy of working rock-cutting tool operability determination due to recording of chaotic axial load fluctuation to be applied to drilling bit.
1 ex, 2 dwg
FIELD: oil and gas production.
SUBSTANCE: invention refers to oil production, notably, to process of boring wells and is designed for automatic regulation of bottom-hole pressure of drilling agent and to maintaining it at level of reservoir pressure. The installation is equipped with a boring pump with a regulating drive, with a bottom-hole pressure sensor, with a communication channel, with a receiver, with a control block and with a master of forecast bottom-hole pressure. Additionally the installation is equipped with a correcting link and an integrating block; also the control block is connected to the input of the integrating block, the output of the integrating block is connected with the input of the correcting link, while an output signal from the correcting link is fed to the input of the regulating drive of the boring pump.
EFFECT: upgraded accuracy and reduced time of regulation of bottom-hole pressure of drilling agent.
FIELD: oil and gas production.
SUBSTANCE: device consists of valve including cam with graduated ring, of first flow control path communicated with valve for transfer of fluid medium through power section of tool and of second path of flow control communicated with valve for deviation of fluid medium around power section of tool. Also fluid medium flow via the first and the second paths of flow control stays completely inside the tool; the valve is able to control amount of fluid medium flow via at least one of flow control paths using the cam. Also there are suggested versions of device and the procedure.
EFFECT: efficient fluid medium flow control and efficient adjustment of working characteristics of downhole tool.
48 cl, 14 dwg
FIELD: oil and gas production.
SUBSTANCE: according to procedure difference of pressure effecting rotation engine is applied for adjustment of guide valve which is so enabled to regulate control pressure of supply control valve. The installation consists of the guide valve adjusting control pressure of the supply control valve under effect of difference of pressure operating at a rotation engine. The valve also contains a delay element retarding return of a valve slide to a normal position at travel of the slide from the normal position under effect of pressure difference operating on the rotation engine.
EFFECT: facilitating more reliable and functionally improved adjustment.
8 cl, 1 dwg
FIELD: oil and gas production.
SUBSTANCE: invention refers to procedure for control of drilling rig operation wherein consumption of circulating medium flow of rig is determined and operation of rig is controlled on base of this consumption of circulating medium flow. Consumption (FLOW) of circulation medium flow of rig is determined and rig operation is controlled on base of this consumption by means of effecting pressure (p-Flow) of circulating medium.
EFFECT: new solution for control over operation of rig on base of consumption of circulating medium flow.
21 cl, 3 dwg
FIELD: oil and gas production.
SUBSTANCE: versions of practice implementation consist in maintaining constant efficiency at drilling with device of horizontal-directed drilling. The device is equipped with a pump of axial thrust. Further, the versions consists in measurement of pressure of hydro-system working fluid in one or several pumps of a horizontal-directed drilling device, in comparison of measurements of working fluid pressure of hydro-system with alternative pressure limit, in calculation of value of derivative with derivative threshold, in decreasing alternate limit of pressure when value of derivative exceeds derivative threshold, also, value of decrease of alternate limit of pressure is based on one or several measurements of pressure of hydro-system working fluid, in reduction of output of the axial thrust pump, when comparison of measurement of pressure of hydro-system working fluid indicates, that one or several measurements of working fluid pressure exceed alternate pressure limit.
EFFECT: automatic control of axial thrust functions of retracting and rotation.
15 cl, 13 dwg
SUBSTANCE: device for automation of chisel feed comprises a casing connected in its upper part with an adapter bushing, which in its turn is connected to a valve unit having through holes, in the lower part the casing is detachably connected to a stem adapter bushing, which is fixed with a nut, and between the casing and the stem adapter bushing there is a circular cavity, where a diaphragm is installed, besides, the circular cavity is connected with a groove in the casing by a hole, above which there is a check valve arranged in the groove. The method for automation of chisel feed includes using a drilling circulation system to determine the axial load at the chisel. Above the chisel a device is installed for realisation of the method for automation of chisel feed, the axial load at the chisel during flush drilling is determined using the pressure drop in the circulation system with variation of the axial load in the lower part of the drilling string, namely, if there isn't an axial load at the chisel, through holes open in the valve unit of the device for realisation of the method for automation of chisel feed, and in case there is an axial load at the chisel, through holes partially close in the valve unit as a result of upward displacement of the stem adapter bushing, besides, pressure in the circulation system is fixed with a pressure gauge on the drilling string.
EFFECT: development and use of pressure drops in the circulation system, facilitation of drilling string operation accounting to maintain the specified bottomhole conditions.
3 cl, 4 dwg
FIELD: oil and gas industry.
SUBSTANCE: method involves creation of differential pressure in a well-formation system due to density of flushing liquid, creation of hydrodynamic component of differential pressure by starting drilling pumps at approximation of a bit to a working face, as well as switching-over the hammer to design load and frequency of its rotation. Differential pressure of flushing liquid at the face is increased till drilling speed increase is stopped with further maintenance of the set mode.
EFFECT: increasing the drilling rate of high-permeability rocks during inclined and horizontal drilling.
FIELD: oil and gas industry.
SUBSTANCE: invention relates to the method for drilling of a well shaft. The method includes drilling of a well shaft by means of a continuous drilling string of lifting pipes, measurement of at least one parameter by means of an optical wave guide in a drilling string, besides, measurement includes a stage, when they determine optical back scatter along the optical wave guide, and nozzle adjustment, thus causing fluid inflow into the well shaft or fluid loss from the well shaft, at the same time measurement of at least one parameter additionally includes a stage, when they determine fluid inflow or loss.
EFFECT: increased efficiency.
26 cl, 8 dwg