Method of control over hydraulic face motor under face conditions

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises measuring the pressure in injection line with loaded and idle bit and maintaining constant measured differential pressure. Note here that maximum tolerable bit feed speed (Vtf) is defined by mathematical formula. Then, bit feed speeds are defined and in case it exceeds said maximum tolerable magnitude it is decreased to Vtf.

EFFECT: higher efficiency of drilling.

2 dwg

 

The method of controlling the mode of operation of hydraulic downhole motor in downhole conditions

The invention relates to the drilling of oil and gas wells hydraulic downhole motors, and in particular to methods of operating mode control of hydraulic downhole motor in downhole conditions.

A known method of controlling the mode of operation of the downhole motor in downhole conditions on the testimony downhole hydrocooler (see source - book of Wadesboro JV Drilling oil and gas wells. - M.: Nedra, 1973, p.59). In this way the control over the generated axial load is on the ground the weight indicator and the frequency of rotation of the bit is an output shaft of the engine is controlled by hydrocooler. The reading of the pressure gauge on the riser in this way fixes the engine stop and the accompanying sharp increase in pressure drop.

A known method of controlling the operation mode of rock cutting tool during drilling screw downhole motors (SU # 1376649, E21B 4/02, publ. 30.09.1990), including the pressure in the discharge line during engine operation at constant load, it is permissible wear of the tool is determined from the ratio of pressures measured at different operating conditions of the engine, and replace the tool when the values of this ratio not exceeding in azannyh limits:

P-Px.x'P0-Px.x=1,3÷1,7

The known method provides for the registration of the pressure corresponding to the operation mode of the engine on the bottom with no load after washing the borehole bottom, and the stabilization of the pressure drop in the discharge line and under load, and the pressure in the discharge line is produced at a constant weight on the bit, measured by ground-based weight indicator. It is permissible wear of rock cutting tool is determined from the ratio of pressures measured at the beginning of drilling and its current value.

For all the above methods, the drilling control characteristic low quality the axial load on the rock-breaking tool for drilling horizontal and directional wells, the downhole motor.

When drilling downhole motor are often problems associated with the instability of his work - interleaved modes from optimal to brake and stop the engine, due to the heterogeneity (hardness) to be drilled rocks. P is acesse PDM work in horizontal and directional wells causes frequent stops of the engine is the lack of precise control of the brake torque, directly related to the uncontrollability of the generated axial load. The impossibility of determining the load is directly connected with the work of the friction of the drill string in the borehole. In the process of deepening the horizontal part she perceives as compressional, shear, and bending loads. Friction (landing) of the drilling tool due to both the heterogeneity of the drilled rocks (physico-mechanical properties), corners well curvature and angle of twist of the drill string due to the perception of the reactive torque of the engine, affecting its spatial position in the borehole. The increased friction associated with the change in the flow rate Q and the hydraulic force W at variable engine operating conditions that affect the lower quality of treatment and, as a consequence, leads to salamouny the annulus of the well.

In most drilling companies in drilling horizontal sections of the wells included in the layout of the bottom hole Assembly (BHA) of the downhole motor determining the axial load on the bit is as follows: carry out the descent BHA 5-10 m before reaching the slaughter; determining the weight on the hook; includes pump and run PDM without load; record the pressure on the manifold (riser drilling rig) when the engine is running, nicholaston course; lower BHA to the bottom and again record the pressure on the manifold with a smooth creating a load on the bit. With the growing pressure on the manifold is determined by the axial load on bit and torque on a shaft of the engine when operating optimally (according to passport characteristics SDM), and the brake mode. Then on the metro GTI (geological-technical research), which provides information about the magnitude of the axial load is determined only by the weight of the column (loss - weighting) in the process of descent and drilling, producing the actual adjustment of the axial load on the bit.

Method of operating mode control screw engine in downhole conditions (SU # 1128646, IPC E21B 4/02, publ. 30.09.1990) adopted for the prototype. The method consists in the implementation of measurement readings of the pressure in the discharge line when the engine is under load and without load, and maintain the desired shaft speed of the engine is carried out by maintaining a constant difference between the measured pressure. The accuracy of the control mode of the engine, this method is satisfactory when drilling a strong and homogeneous medium breeds.

The disadvantages of the method include the fact that, as experience has shown, it is not possible with sufficient accuracy to control and manage the operation modes of the engine when drilling Laborem nirvanah soft rock, since under these conditions the cutters of the drill bit penetrate to a great depth, and the liquid is not completely washes out the cut rock, which reduces the quality of the barrel and the rate of penetration, this mode helps clinicoanatomical.

Theory of rock failure was based on the axial load on the bit, as the easiest and most affordable option, which was continuously monitored via hydraulic weight indicator. The research was conducted in two directions: the dependence of the mechanical drilling speed on the magnitude of the axial load on the bit and the dependence of the rate of drilling speed bits:

Vm=f(G)andVm=f(n);(1)

where: V mechanical ROP;

f - function; G is the axial load; n - rotational speed of the bit.

In accordance with the laws of physics, the velocity of any process depends on the magnitude of energy consumed, as well as the drilling process is no exception, and the rate of drilling depends on the amount of energy consumed, ie,

Vm=f(W/mi> d);(2)

where: W - the energy spent on the bit, it consists of hydraulic W and mechanical W.

Wd=Wg+Wm;Wg=ΔPd*Q;Wm=6,28M*n;(3)

where: Δ - pressure drop in the bit, Q is the flow rate of drilling fluid, M is the torque on the bit, n is the frequency of rotation of the bit.

Hydraulic energy at the bit constant as the flow rate and the difference in the bit constant, therefore, to simplify the task at this stage is not considered.

Mechanical energy is dependent on the torque on the drill and the frequency of rotation of the bit. During turbine drilling to define neither one nor the other values without additional complicated and expensive devices is not possible, so the choice was made to control one component torque and speed - axial load on the bit.

M=f(Gmo> );n=f(G);(4)

For turbine drilling this approach is fair and efficient.

With regard to the use of downhole motors, then there exists a simpler, more accurate and reliable method of determining and controlling spent on the bit of mechanical energy at a known poster the characteristics of PDM and the known flow rate of drilling fluid.

As already mentioned, the mechanical speed of penetration depends only on the quantity spent a bit of energy. If the bit receives mechanical energy, the rate of penetration will correspond to the magnitude of this energy and geological conditions, and it does not matter what the true axial load is present on the bit. The energy spent on the destruction of the breed consists of works of only 2 units (5), namely, torque and speed, as you can see, there is no axial load. Torque on the bit depends on several unknown parameters: mechanical rock properties, axial load, status bits, and others - all this is unknown, but known to itself the amount of torque and its constituent parts in Yes who " lose their meaning.

Wm=6,28M*n,KInt;gde:(5)

W - output mechanical power of PDM, is mechanical energy transmitted to the bit spent on the destruction of the breed, kW;

M - torque on the bit, CNM;

n is the frequency of rotation of the bit, C-1.

Torque on the bit, as it is known, can easily be determined by the magnitude of the differential pressure during drilling and marking characteristics of PDM. The frequency of rotation of the bit is also easily determined by the flow of drilling fluid and nameplate capacity PDM.

Thus, it is enough to control the size of the mechanical energy expended by the chisel on the destruction of the breed to ensure the necessary mechanical ROP. However, as practice has shown, there are geological conditions (loose rocks), in which the nominal amount spent on the bit of mechanical energy is excessive, and then deteriorates the quality of the barrel walls and deteriorating removal of drilling cuttings.

The present invention is to improve the efficiency of drilling wells by the Opera of the positive changes the mode of operation of hydraulic downhole motor with the introduction of the cutters of the bit in rocks of different plasticity (solid, soft, sebastiendrums etc.) by improving the quality control of the feed speed of the bit.

The technical result is achieved due to the fact that the method of controlling the mode of operation of hydraulic downhole motor in downhole conditions, including measurements of the pressure in the discharge line under load and no load on the bit, maintain a constant difference between the measured pressure readings, according to the invention, determine the maximum value of the feed speed of the drill bit (V p) by the formula:

Vp.daboutp=a×h×n,m/handwith a,gde:(6)

V. - the maximum permissible feed speed of the bit, m/h;

a - experimental value-dependent plasticity of rocks (from 0.5 to 0.95),-1;

h - the height of the working part of the cutters of the bit, m;

n is the frequency of rotation of the bit, R/h; carry out measurements of the feed speed of the bit and in case of exceeding the above maximum value is reduced to V..

Figure 1 shows the performance of wells drilled on the same Bush.

The first well No. 1 was drilled in limestone is Tomo method, and up to 10 hours PDM just passed 161 m of penetration, the average mechanical speed reached 121, 1million m/hour.

The second well No. 2 was drilled by the invention method, and for 10 hours passed 426 m of penetration with average mechanical speed 79 m/hour. Both wells are drilled the same type of PDM and similar bits.

Figure 2 shows the depth of penetration of the cutter bits on the rocks.

On Figa shows the depth of destruction h1 hard rock cutter bit with the height of the working part is equal to h corresponding to the feed speed of the tool V1 when the frequency of rotation of the bit n.

On Figb shows the depth of penetration of the bit into the soft rock, in nominal mode of drilling, the feed speed of the tool V2 when the frequency of rotation of the bit n, the depth of penetration of the bit into the soft rock corresponds to h2.

On FIGU presents the scheme of drilling soft rock with an estimated maximum ROP V3. The slice thickness of the breed for one revolution of the bit (the depth of penetration of the cutter bit) is h×a, where h is the height of the working part of the cutters of the bit, m; a - experimental value-dependent plasticity of the breed. The drilling mode in this period is less than the nominal.

The method is as follows. Determine the maximum value of the feed speed of the drill bit (V..) by the formula (6). After the descent of the drill to the Onna into the borehole and including mud pumps, bring the rock-breaking tool (chisel) to the bottom and slowly increase the load on the bit, by feeding the drill string. While watching the growth of pressure in the discharge line, and when the pressure of the working values of the feed rate will stabilize at this level. With further drilling, in case of pressure drop to maintain the desired mode of operation SDM feed rate of the bit increases, but as soon as it has reached its maximum value calculated by the formula (6), further feeding the carry bit on the estimated speed and the engine operation mode is changed, and in this period, the mode does not match the nominal. This mode continues until the end of the soft layer. When implementing incisors bit more hard rock moment on the bit and the load will increase rapidly (due to high feed speed of the tool), as evidenced by the increase in working pressure, at this time reduce or completely stop the flow of bits, and resume only after the fall of the pressure to the recommended nominal value. Further, the feed speed of the bit fitting for the rate at which mechanical energy at the bit to be permanent and to meet the recommended amount of weight on the hook can be changed at any range, but not below mi the distribution panel is minimal valid, specified in the documentation. The proposed method can be used to control drilling for screw downhole motors and turbodrills.

Experience drilling wells in Western Siberia has shown that the construction of wells in identical conditions using the same equipment is very different. It was assumed that this is due to excessive wear of the working bodies of the engine, but after removing energy performance exhaust engines was that the technical condition of all good engines.

Subsequent studies have shown that at the time of well construction adversely affected by high feed speed of the tool at a nominal flow on the bit of mechanical energy. As in the case of the contact of the bit with the softer the rock, the presence of nominal mechanical energy in the bit will lead to a very deep incision not only cutters and blades of the bit. I.e. there will be puncturing of the breed, the breed is not cut, crushed and stuck on the bit and other elements of the BHA. The wall of the wellbore for this reason have an uneven appearance, and the barrel is complicated, so we have to build-up a long time to work out. There are cases when the time of the study, and wash well in front of the building exceeded the time of mechanical Boo is placed in three - four times. And therefore increased the time of well construction. Making data adjustments in the operating mode control PDM by limiting the feed rate of the tool to the calculated value, are excluded for further accelerates the process of well construction.

Thus, the proposed method by taking into account the influence of the properties of the formations drilled and timely changes in drilling mode, reducing the feed speed of the tool to the maximum permitted value, significantly increases the drilling efficiency.

The specific implementation of the method of controlling the mode of operation of hydraulic downhole motor consider the example of drilling wells No. 1 and No. 2 Eat-Yoga field Tyumen region Drilling was carried out downhole motor DR-178. 6/7 .62 with depth 738-747 m the First drilled well # 1 using well-known ways of controlling engine operation mode of the prototype. For the first day passed 161 m up to 10 hours of PDM, the average mechanical speed was 121, 1million m/hour, i.e. from 10 hours PDM only 1,33 h was clean drilling.

In the process of drilling soft rock mechanical speed up to 250 m/h. Technological ROP, including the time of leaching and elaborations in front of the building amounted to $ 16.1 m/hour. During the drilling of well No. 2 on this W the Bush according to the formula of the present invention is defined allowable value of the feed speed of the tool, which was 100 m/h during drilling without rotation of the tool and 130 m/h with rotation of the tool rotor 60 rpm Drilling of well No. 2 was carried out in the same modes as well # 1 except drilling speed plots soft rocks, where the feed speed of the tool was limited to the calculated values. As a result, over 10 hours PDM passed 426 m for 5.39 hours of drilling, the average mechanical speed was 79 m/h, which is 35% lower than in the first well. Despite the fact that the average mechanical speed for drilling the second well has decreased over the same time PDM drilled 2.64 times more meters, and speed rose to 42,6 m/h

Proposed method of control the mode of operation of hydraulic downhole motor in downhole conditions allowed with sufficiently high accuracy to control and manage the operation mode of the engine when the input and output bits in soft rocks that have improved the cleaning of the shaft and bit. In the stopped clinicabarcelona, improved patency of BHA in the wellbore. Technological rate of penetration increased by 2.64 times. Time PDM during the drilling of all wells decreased, and accordingly decreased engine wear. redlagaemyi method has improved the accuracy of the operating mode control of hydraulic downhole motor in downhole conditions, especially when drilling soft, weakly cemented rocks, quickly change the mode of operation of the engine when changing downhole conditions, to reduce the time of operation of the engine and the wear rate, to improve the cleaning of the bottom hole drilling, improve the technology of drilling performance and durability of the working bodies of the engine, reduce cost, save time drilling wells.

The method of controlling the mode of operation of hydraulic downhole motor in downhole conditions, including measurements of the pressure in the discharge line under load and no load on the bit, maintaining a constant difference of the measured readings of pressure, characterized in that to determine the maximum value of the feed speed (V.) bits according to the formula:
V.=a·h·n, m/h,
where V. - the maximum permissible feed speed of the bit, m/h;
a - experimental value-dependent plasticity of rocks (0,5-0,95)-1;
h - the height of the working part of the cutters of the bit, m;
n is the frequency of rotation of the bit, R/h;
carry out measurements of the feed speed of the bit and in case of exceeding the above maximum value is reduced to V..



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: following equipment is installed preliminary: a) uncontrolled acoustic rejection filter in injection line in order to suppress interfering noises in wash liquid which are generated by drill pump; b) controlled acoustic rejection filter - rotational velocity sensor for hydroturbine motor shaft in order to carry out amplitude modulation of total sound, sound generated by rotor blades at hydroturbine motor shaft and sound generated by bit blows against rock to wash liquid filling drill-rod string; c) hydrophone with measurement tools between gooseneck in-built into swivel and drill hose. Turbine motor with bit at butt-end of drill-rod string is landed to the well with subsequent stop at distance of 10-20 metres from the bottom in order to measure rotational velocity of turbine motor shaft under no-load conditions. Drill pump is switched on to deliver wash liquid through drill-rod string to turbine motor for the purpose of rotor blades rotation. At that rotation of rotor blades generates sound in wash liquid. Then receipt is made by hydrophone from wash liquid by modulated controlled acoustic rejection filter - rotational velocity sensor for turbine motor shaft against noise amplitude proportional to rotational frequency of hydroturbine motor under no-load conditions in the band of suppressed interfering noise generated by drill pump, uncontrolled acoustic rejection filter. At that measurement devices convert processed audio information about rotational velocity of hydroturbine motor under no-load conditions in order to plot actual full-load characteristic by shifting plant characteristic in order to select optimal bit load at actual load characteristic of hydroturbine motor less friction of drill-rod string against walls of the horizontal well at minimum energy of sound propagated in the drill-rod string in wash liquid for this oil-reservoir horizon according to the work order specified by geologists. Then by means of set of discreet point actual load characteristic is plotted against simultaneous data - bit load and rotational frequency of hydroturbine motor shaft under no-load conditions before its stoppage, for example, at five tons. Then lateral drilling is made in optimal bit load mode shifted from plant load characteristic specified in the work order. In case of deviation of lateral drilling from the optimal mode demonstrating increase of sound energy from two sources bit load is regulated by change of load to a lesser or bigger value according to actual load characteristic of hydroturbine motor considering minimum energy of sound propagated in wash liquid from two sound sources - sound generated by turbine blades and sound generated by bit teeth blows to wash liquid filling the drill-rod string.

EFFECT: development of method for bit load regulation during lateral drilling against actual load characteristic of hydroturbine motor plotted against simultaneous data received in drilling process about rotational velocity and bit load.

6 dwg

FIELD: mining.

SUBSTANCE: adaptive control method of well drilling conditions is based on control of well sinking speed by changing an axial load on a drilling tool, frequency of its rotation and flow rate of flushing fluid separately or in their combination; with that, the above parameters shall be strictly in compliance with geological working face conditions determined with hardness of mine rock as per the specified algorithm. A well drilling bit includes a housing, a shaft with a pilot bit and a central flushing channel, which is attached to the housing; a flushing assembly in the form of radial channels and head pieces. With that, in upper part of the shaft and opposite teeth of rolling cutter located in upper position relative to the teeth contacting the working face, there installed are additional head pieces for flushing of inter-teeth gaps blocked with slurry.

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FIELD: oil and gas industry.

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15 cl, 15 dwg

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10 cl, 1 dwg

FIELD: oil and gas industry.

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21 cl, 11 dwg

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2 cl, 1 dwg

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1 cl, 3 dwg, 2 tbl

FIELD: oil and gas industry.

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1 dwg

FIELD: machine building.

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EFFECT: improving accuracy of the method and its approximation to HBM operating conditions.

1 dwg

FIELD: machine building.

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1 dwg

FIELD: machine building.

SUBSTANCE: screw hydraulic machine includes rotor and stator of screw shape without any elastomeric coating, which are installed with a gap. Stator is solid metal alloy ceramic or composite material. Rotor is directed on its ends with guide system to exclude direct contact to stator. In addition, rotor surface or stator surface have grooves.

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16 cl, 7 dwg

FIELD: mining.

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5 cl, 5 dwg

FIELD: machine building.

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EFFECT: creation of general-purpose test bench with wide range of standard sizes of HBM without readjustment of the bench; increase in maximum braking torque moment, improvement of measurement accuracy and efficiency.

3 cl, 3 dwg

FIELD: oil and gas production.

SUBSTANCE: device comprises a spring-loaded stop element, an elastomer seat with guide ribs, collars with central holes, valve seats. The valve is installed in the nipple of the hinged joint or torsion bar of the spindle in a screw bottomhole motor, in which holes are made for possible passage of a working medium.

EFFECT: simplified design, higher reliability.

6 cl, 6 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: device has metallic hubs of stator and rotor, wherein crowns of stator and rotor are concentrically pressed. Crowns of stator and rotor are made of durable ceramics and are additionally equipped with connections, allowing to exclude non-controlled turning of crowns in hubs and spontaneous axial displacement thereof.

EFFECT: higher reliability and efficiency.

2 dwg

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