CN108397183B - Low-yield horizontal well production profile logging combination instrument with dual working modes - Google Patents
Low-yield horizontal well production profile logging combination instrument with dual working modes Download PDFInfo
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- CN108397183B CN108397183B CN201810182569.2A CN201810182569A CN108397183B CN 108397183 B CN108397183 B CN 108397183B CN 201810182569 A CN201810182569 A CN 201810182569A CN 108397183 B CN108397183 B CN 108397183B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
Abstract
The invention discloses a low-yield liquid horizontal well output profile logging combination instrument with a dual working mode, which relates to the technical field of oil field horizontal well logging and comprises the following components: a sleeve; the sleeve is internally provided with a combined instrument main body; a flow guide mechanism is arranged between the combination instrument main body and the sleeve; a first flow channel is arranged between the sleeve and the main body of the combination instrument, a second flow channel is arranged in the main body of the combination instrument, and an oil-water overflowing accumulation selection mechanism and a measurement mechanism are arranged in the second flow channel; the oil-water overflowing accumulation selecting mechanism switches an oil phase overflowing measuring mode or an oil phase accumulating measuring mode; the measuring mechanism is used for measuring the fluid flow and the water content in the phase flow measuring mode or the oil phase accumulation measuring mode; the flow guide mechanism is used for guiding the fluid in the first flow passage into the second flow passage; wherein the low yield liquid is 1m3/d～10 m3And d. The method solves the problems of measuring the flow rate and the water content of the low-yield liquid horizontal well.
Description
Technical Field
The invention relates to the technical field of oil field horizontal well logging, in particular to a low-yield liquid horizontal well production profile logging combination instrument with a dual working mode, and particularly relates to a current-collecting type low-yield liquid oil-water two-phase logging combination instrument for measuring a low-yield liquid horizontal well production profile.
Background
In the late development stage of Daqing oil fields, the development of thin-difference oil reservoirs and peripheral low-permeability oil reservoirs becomes important power for sustainable development of Daqing oil fields. The horizontal well technology is an effective way for developing thin-difference layers and low-permeability oil and gas fields. Because the well bore of the horizontal well horizontally extends for a long section of length in the oil layer, the contact area between the production well section and the oil layer is effectively increased, the cost of one horizontal well is 2-3 times that of a straight well, but the yield is 3-4 times that of the straight well, and the economic benefit of the oil well is greatly improved.
At present, 600 openings of a horizontal well exist in Daqing oil fields, the application scale of the horizontal well is still continuously enlarged, but along with the extension of development time, the water content of the horizontal well rapidly rises after water breakthrough, the oil yield is rapidly reduced, and the development effect of the horizontal well is seriously influenced. The horizontal well subsection output profile test data is an important means for guiding yield increase and water control measures such as fracturing, water plugging and the like, at present, a mature output profile logging technology suitable for a low-yield liquid horizontal well does not exist in each large oil field in China, and the Daqing oil field horizontal well production profile logging combination instrument mainly adopts a flow-collecting turbine flowmeter and a capacitance type water cut meter to carry out combined logging. Wherein, the turbine flowmeter is used for measuring the flow, and electric capacity moisture content meter is used for measuring moisture content. In the well logging process, after the well logging combination instrument is conveyed to a target interval through the tractor, the flow and the water content of the producing zones are subjected to flow concentration measurement by the ground control well logging instrument, and then the split-phase flow of oil and water of each producing zone is calculated. However, for the Daqing peripheral low fluid production horizontal well, the average single well fluid production is 10m3/d, and the fluid production of some tested intervals is even lower than 1m3/d, which seriously affects the accurate measurement of the production profile. Firstly, in the aspect of flow measurement, the speed of fluid cannot reach the starting displacement of a turbine, so that the turbine cannot work normally, and the turbine is easy to be stuck by sand, so that the stability of the turbine flowmeter is poor; in the aspect of water content measurement, under the special condition of low-yield liquid oil-water stratified flow of a horizontal well, the water content resolving capacity of the coaxial capacitance water content meter is 20% -80%, because the coaxial capacitance sensor is easily submerged by an excessively low oil liquid level when the water content is low (below 20%) and is easily submerged by an excessively high water liquid level when the water content is high (above 90%), the measurement error of the capacitance water content meter is increased, and even the response value is not changed along with the change of the water content in the well. The phenomenon results in poor measurement effect of the traditional horizontal well logging combination instrument under the condition of low liquid production. Therefore, in order to solve the problems of measuring the flow rate and the water content of the horizontal well with low liquid production (1m3/d-10m3/d), the invention designs a low liquid production horizontal well production profile logging combination instrument with a dual working mode.
Disclosure of Invention
In view of this, the invention provides a low fluid production horizontal well production profile logging combination instrument with a dual working mode, so as to solve the problem of measuring the flow rate and the water content of a low fluid production horizontal well.
The invention provides a low-yield liquid horizontal well production profile logging combination instrument with a dual working mode, which comprises:
a sleeve;
the sleeve is internally provided with a combined instrument main body;
a flow guide mechanism is arranged between the combination instrument main body and the sleeve;
a first flow channel is arranged between the sleeve and the main body of the combination instrument, a second flow channel is arranged in the main body of the combination instrument, and an oil-water overflowing accumulation selection mechanism and a measurement mechanism are arranged in the second flow channel;
the oil-water overflowing accumulation selecting mechanism selects or switches an oil phase overflowing measuring mode or an oil phase accumulating measuring mode;
the measuring mechanism is used for measuring the fluid flow and the water content in the phase flow measuring mode or the oil phase accumulation measuring mode;
the flow guide mechanism is used for guiding the fluid in the first flow passage into the second flow passage;
wherein the low yield liquid is 1m3/d～10m3/d。
Preferably, the oil-water overflowing accumulation selecting mechanism is a rotatable cavity, and the measuring mechanism is arranged in the rotatable cavity;
a rotatable cavity liquid inlet and a rotatable cavity liquid outlet are formed in the outer side of the rotatable cavity;
the rotatable cavity rotates, and when the liquid inlet of the rotatable cavity is arranged on the upper side of the rotatable cavity, the rotatable cavity enters an oil phase over-current measurement mode;
the rotatable cavity rotates, and when the liquid inlet of the rotatable cavity is arranged at the lower side of the rotatable cavity, the rotatable cavity enters the oil phase accumulation measurement mode;
wherein, the liquid inlet of the rotatable cavity and the liquid outlet of the rotatable cavity are arranged at the same side.
Preferably, the measuring mechanism includes: a full water value measuring sensor, an electric conduction type water content meter, a turbine flowmeter and a single-phase flow measuring sensor;
the full water value measuring sensor is used for measuring the conductivity of the water phase;
the electric conduction type water content meter is used for measuring the oil-water mixed phase electric conductivity;
the turbine flowmeter is used for measuring the total volume flow of the fluid;
and the single-phase flow measuring sensor is used for measuring the single-phase flow under the low liquid production rate.
Preferably, the outer side of the rotatable cavity is provided with a combiner housing;
the inner side of the combination instrument shell and the inner side of the rotatable cavity are the second flow channel;
the flow guide mechanism is arranged on the outer side of the combiner shell.
Preferably, one end of the combination instrument shell is a combination instrument liquid inlet, and the other end of the combination instrument shell is a combination instrument liquid outlet;
the flow channels of the liquid inlet of the combination instrument and the liquid outlet of the combination instrument are the second flow channels;
the flow guide mechanism is arranged between the liquid inlet of the combination instrument and the liquid outlet of the combination instrument.
Preferably, the rotatable cavity further comprises: an XYZ-axis orientation sensor;
the XYZ-axis orientation sensor measures a position of a rotatable cavity liquid inlet of the rotatable cavity.
Preferably, one end of the rotatable cavity is connected with the rotating mechanism;
the rotating mechanism is used for driving the rotatable cavity to rotate to a specified position;
the appointed position is that the liquid inlet of the rotatable cavity is arranged at the lower side of the rotatable cavity or the liquid inlet of the rotatable cavity is arranged at the upper side of the rotatable cavity.
Preferably, the rotation mechanism comprises: the rotatable cavity rotates and drives the motor, the hollow fixed rod and the fixed short circuit;
one end of the rotary cavity rotary driving motor is connected with the rotary cavity, the other end of the rotary cavity rotary driving motor is connected with the hollow fixed rod, and the hollow fixed rod is connected with the fixed short circuit.
Preferably, the flow guide mechanism includes: a current collector;
the current collector is in short circuit connection with a current collector motor drive;
and the collector motor drives the short circuit to drive the collector to guide the fluid in the first flow passage into the second flow passage.
Preferably, the oil-water overflowing accumulation selecting mechanism is connected with the control unit;
and the control unit automatically selects or switches an oil phase over-current measurement mode or an oil phase accumulation measurement mode according to the control instruction.
The invention has the following beneficial effects:
the invention provides a low-yield liquid horizontal well output profile logging combination instrument with a dual working mode, which aims to solve the problem of measuring the flow rate and the water content of a low-yield liquid horizontal well. Specifically, the invention has the advantages of low lower limit of flow measurement, high test precision, basically no movable part (except a turbine) of a sensor group and high reliability, can effectively solve the problems that the lower limit of the flow of the current horizontal well output profile logging instrument can not meet the production requirement, the instrument reliability is poor and the test precision is low, is suitable for various logging processes such as tractor conveying, oil pipe conveying and the like, can realize accurate measurement of downhole flow, and has wide application and development prospects.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a dual mode operation of a combination tool for low fluid production horizontal well production profile logging in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a second mode of operation of the low fluid production horizontal well production profile logging tool in a dual mode of operation according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a full water level measurement sensor according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an electrically conductive moisture content meter according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a column multi-probe single-phase flow measurement sensor configuration according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the response law of a single-column multi-probe single-phase flow measurement sensor according to an embodiment of the present invention;
FIG. 7 is a graph of turbine flow meter response rules for an embodiment of the present invention;
FIG. 8 is a diagram of the response rule of the conductivity watercut meter according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a dual-operation-mode logging combined sensor short-circuit mechanical structure according to an embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the present invention, certain specific details are set forth. However, the present invention may be fully understood by those skilled in the art for those parts not described in detail.
Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the invention, features and advantages thereof, and are not necessarily drawn to scale.
Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".
The invention provides a low-yield liquid horizontal well output profile logging combination instrument with a dual working mode, which has higher measurement precision and lower flow measurement lower limit. The combination instrument has two working modes, namely an oil phase overflowing measuring mode (mode one) and an oil phase accumulating measuring mode (mode two), wherein the oil phase overflowing measuring mode can measure the total flow and the water content of oil and water phases under the flow concentration condition, and the oil phase accumulating measuring mode can accurately measure the volume flow of an oil phase single phase under the low-yield liquid condition. The mode switching is realized by the rotation of a rotatable cavity of a core component and a matched test sensing technology, and the specific technical scheme is as follows.
Fig. 1 is a schematic diagram of a dual mode operation mode of a low fluid production horizontal well production profile logging tool according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a second working mode of the low fluid production horizontal well production profile logging combination tool in a dual working mode according to an embodiment of the invention. As shown in fig. 1 and 2, a combination instrument for logging production profile of low fluid production horizontal well with dual operation modes comprises: a sleeve 3; the sleeve 3 is internally provided with a combined instrument main body; a flow guide mechanism is arranged between the combination instrument main body and the sleeve 3; a first flow channel is arranged between the sleeve 3 and the main body of the combination instrument, a second flow channel is arranged in the main body of the combination instrument, and an oil-water overflowing accumulation selection mechanism and a measurement mechanism are arranged in the second flow channel; the oil-water overflowing accumulation selecting mechanism selects or switches an oil phase overflowing measuring mode or an oil phase accumulating measuring mode; a measuring mechanism that measures a fluid flow rate and a water content in a phase flow measurement mode or an oil phase accumulation measurement mode; the flow guide mechanism is used for guiding the fluid in the first flow passage into the second flow passage; wherein the low yield liquid is 1m3/d～10m3/d。
In fig. 1 and 2, the oil-water overflow accumulation selection mechanism is a rotatable cavity 6, and the measurement mechanism is arranged in the rotatable cavity 6; a rotatable cavity liquid inlet 7 and a rotatable cavity liquid outlet 12 are arranged on the outer side of the rotatable cavity 6; the rotatable cavity 6 rotates, and when the liquid inlet 7 of the rotatable cavity is positioned at the upper side of the rotatable cavity 6, the oil phase overflowing measurement mode is started; the rotatable cavity 6 rotates, and when the rotatable cavity liquid inlet 7 is arranged at the lower side of the rotatable cavity 6, the oil phase accumulation measuring mode is started.
Wherein, the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 are arranged on the same side.
In fig. 1 and 2, a measuring mechanism includes: a full water value measuring sensor 8, an electric conduction type water content meter 11, a turbine flowmeter 9 and a single-phase flow measuring sensor; a full water value measuring sensor 8 for measuring the conductivity of the water phase; the electric conduction type water content meter 11 is used for measuring the oil-water mixed phase conductivity; a turbine flowmeter 9 for measuring a total volumetric flow rate of the fluid; and the single-phase flow measuring sensor is used for measuring the single-phase flow under the low liquid yield. The single-phase flow measurement sensor can be a single-row multi-probe single-phase flow measurement sensor 13. Specifically speaking, rotatory combination of two mode of operation measures the short circuit (oil water overflows and accumulates selection mechanism), includes: rotatable cavity 6, the cavity inside of rotatable cavity 6 is in proper order: the device comprises a full water value measuring sensor 8, a turbine flowmeter 9, a conductance water content meter 11, a single-column multi-probe single-phase flow measuring sensor 13 and a rotary driving circuit cartridge short circuit 14. The dual working mode logging combination tool realizes the switching between the first working mode and the second working mode through the rotation of the rotatable cavity 6. The first operation mode is shown in fig. 1, and the second operation mode is shown in fig. 2.
In fig. 1 and 2, the rotatable cavity 6 has a combiner housing 5 on the outside; the inner side of the combiner shell 5 and the inner side of the rotatable cavity 6 are provided with a second flow passage; the outside of the combiner housing 5 is provided with a flow guide mechanism.
In fig. 1 and 2, one end of the combination instrument housing 5 is a combination instrument liquid inlet 2, and the other end of the combination instrument housing 5 is a combination instrument liquid outlet 18; the flow channels of the liquid inlet 2 and the liquid outlet 18 of the combination instrument are second flow channels; the flow guide mechanism is arranged between the liquid inlet 2 of the combination instrument and the liquid outlet 18 of the combination instrument.
In fig. 1 and 2, the rotatable cavity 6 further includes: an XYZ-axis orientation sensor 15; the XYZ-axis orientation sensor 15 measures the position of the rotatable chamber liquid inlet 7 of the rotatable chamber 6.
In fig. 1 and 2, one end of the rotatable cavity 6 is connected with the rotating mechanism; the rotating mechanism is used for driving the rotatable cavity 6 to rotate to a specified position; the designated position is that the rotatable cavity liquid inlet 7 is arranged at the lower side of the rotatable cavity 6 or the rotatable cavity liquid inlet 7 is arranged at the upper side of the rotatable cavity 6.
In fig. 1 and 2, a rotation mechanism includes: the rotary cavity body rotates and drives the motor 16, the hollow fixed rod 17 and the fixed short circuit 19; one end of a rotatable cavity rotating driving motor 16 is connected with the rotatable cavity 6, and the other end of the rotatable cavity rotating driving motor 16 is connected with a hollow fixed rod 17, and the hollow fixed rod 17 is connected with a fixed short circuit 19.
In fig. 1 and 2, the guide mechanism includes: a current collector 4; the current collector 4 is connected with a current collector motor drive short circuit 1; the collector motor drives the short circuit 1, and drives the collector 4 to guide the fluid in the first flow passage into the second flow passage. Specifically, collector motor drive short 1 includes: a drive motor, a lead screw and a push rod, which can provide the driving force for the umbrella collector 4. The working principle of the collector 4 is that the motor drives the lead screw to rotate, the rotating force of the lead screw is converted into the thrust of the push rod, and then the push rod drives the umbrella-type collector 4 to open or close.
In fig. 1 and 2, the rotatable cavity 6, comprises: the device comprises a rotatable cavity liquid inlet 7, a rubber sealing ring 10, a rotatable cavity liquid outlet 12 and a circuit tube, wherein the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 are distributed at two ends of the outer side of the rotatable cavity 6, and the central connecting line of the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 is parallel to the axis of the cavity. The rotatable cavity liquid inlet 7 is used for introducing the fluid collected by the current collector 4 into the current collecting channel into the rotatable cavity 6, and the rotatable cavity liquid outlet 12 is used for discharging the measured fluid in the rotatable cavity 6 out of the cavity. The rubber sealing ring 10 is used for sealing and isolating the space between the rotary cavity 6 and the shell, so that the fluid in the collecting channel can only enter the rotary cavity 6 from the liquid inlet 7 of the rotary cavity.
In fig. 1 and 2, the rotary drive circuit cartridge short 14 includes: logging sensor group circuitry, XYZ axle position sensor 15 and rotatable cavity rotation driving motor 16, rotation driving circuit cartridge short circuit 14 can prevent that external fluid from entering into the short circuit inside to cause the malfunctioning of circuitry or XYZ axle position sensor 15 and rotatable cavity rotation driving motor 16. The circuit system of the logging sensor group is mainly used for collecting and processing measurement signals of the sensor group of the combination instrument, digitalizing the signals and transmitting the signals to the ground in a pulse mode through a cable. The intersection point of the positive z-axis direction of the XYZ-axis orientation sensor 15 and the housing of the short circuit cartridge 14 is located on the central line of the rotatable cavity inlet 7 and the rotatable cavity outlet 12 of the rotatable cavity 6, that is, the positive z-axis direction of the rotatable cavity inlet 7 and the rotatable cavity outlet 12 of the rotatable cavity 6 and the XYZ-axis orientation sensor 15 is in one direction. Therefore, the specific underground orientation of the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 of the rotatable cavity 6 can be judged through the response value of the XYZ axis orientation sensor 15.
In fig. 1 and 2, the rotation of the rotatable cavity 6 is realized by a rotatable cavity rotation driving motor 16 fixed in a rotation driving circuit cylinder short circuit 14, a body of the rotatable cavity rotation driving motor 16 is fixed in the rotation driving circuit cylinder short circuit 14, a rotating shaft of the rotatable cavity rotation driving motor 16 is installed at one end of a hollow fixed rod 17, the other end of the hollow fixed rod 17 is fixed on a fixed short circuit 19, and the fixed short circuit 19 is fixed with the combiner casing 5.
In fig. 1 and 2, when the rotatable cavity 6 needs to rotate, the rotatable cavity rotation driving motor 16 is supplied with positive electricity, the rotating shaft of the rotatable cavity rotation driving motor 16 starts to rotate, because the hollow stationary rod 17 is fixed with the housing 5 through the stationary short circuit 19, the body of the rotatable cavity rotation driving motor 16 can only be forced to rotate in the direction opposite to the rotating direction of the rotating shaft, and the body of the rotatable cavity rotation driving motor 16 is fixed with the rotation driving circuit short circuit 14, so the rotation driving circuit short circuit 14 starts to rotate in the opposite direction, and the rotation driving circuit short circuit 14 is fixed with the rotatable cavity 6, thereby realizing the reverse rotation of the rotatable cavity 6.
Similarly, in fig. 1 and 2, the rotatable chamber rotation driving motor 16 is supplied with negative electricity, and the forward rotation of the rotatable chamber 6 can be realized. The positions of the rotatable cavity inlet 7 and the rotatable cavity outlet 12 of the rotatable cavity 6 can be determined by the XYZ-axis orientation sensor 15, and when the rotatable cavity inlet 7 and the rotatable cavity outlet 12 of the rotatable cavity 6 rotate to the top of the cavity, the apparatus enters the first operating mode, as shown in fig. 1, and when the rotatable cavity inlet 7 and the rotatable cavity outlet 12 of the rotatable cavity 6 rotate to the bottom of the cavity, the apparatus enters the second operating mode, as shown in fig. 2.
In fig. 1 and 2, the water content of the low-yield horizontal well production profile logging combination instrument with the dual working modes is tested by adopting a conductivity method, and the total water value measuring sensor 8 is used for measuring the water phase conductivity sigmawThe electric conductance water content meter 11 is used for measuring the oil-water mixed phase conductivity sigmamFrom measured σmAnd σwThe water holding rate of the measured fluid can be determined according to the ratio. The theoretical principle is as follows: maxwell teaches that fine, non-conductive solid particles, small bubbles or oil bubbles are uniformly distributed over a conductivity σcIn a continuous conductive phase with a volume fraction beta, the conductivity of the mixed phase, i.e. the mixed phase conductivity sigmamDepending on β and σ c, there is Maxwell's formula:
on the basis, Begovich and Watson propose the conditions of oil layer layering:
therefore, according to Maxwell's formula and Begovich&Watson's equation, for a two-phase oil/water fluid, the electrical conductivity σ of the oil/water mixture can be determined by the continuous phase of watermConductivity σ with pure aqueous phasewThe ratio of the beta to the beta determines the water holding rate, and the beta in the formula is the water holding rate Y in the oil-water two-phase floww. Maxwell's formula and Begovich&The Watson's equations are measurement models obtained under specific conditions, respectively, and thus a new measurement model needs to be established for a specific application. The water holdup Y is obtainedwAnd under the known flow rate, the water content can be obtained by utilizing an experimental chart or theoretical model correction. The water holding rate Yw can pass through sigmam/σwThe ratio of the two is determined.
In fig. 1 and 2, the total water level measuring sensor 8 (refer to a circumferential conductance probe sensor and a system for measuring the dynamic total water level of a horizontal well, patent number CN201510195212.4) is composed of two metal probes embedded in the insulating inner wall of the rotatable cavity 6 in the axial direction, as shown in fig. 3.
FIG. 3 is a schematic diagram of a full water level measurement sensor according to an embodiment of the present invention; and the description is made by combining the figure 1 and the figure 2, the outer diameter of two probes is 2mm, the height is 2mm, the distance between the probes is 5mm, one probe is an exciting electrode 3-1E, the other probe is a measuring electrode 3-1M, and the sensor can effectively acquire the total water value sigma under the condition of horizontal well oil-water stratified floww. The working principle is that an alternating constant current source is adopted for supplying power, 0.1mA current is applied to an exciting electrode 3-1E, and the voltage of a measuring electrode 3-1M is set to be 0V. When the full water value measuring sensor 8 is powered, a sensitive electric field is formed in a local area around the excitation electrode 3-1E and the measuring electrode 3-1M in the measuring channel of the rotatable cavity 6. When the conductivity of the fluid flowing through the sensitive electric field changes, the voltage signal between the exciting electrode 3-1E and the measuring electrode 3-1M changes along with the change of the conductivity, and the voltage signal between the exciting electrode 3-1E and the measuring electrode 3-1M is processed by a differential amplification circuit, an alternating current-direct current conversion circuit and a voltage-frequency conversion circuit and then is transmitted to a ground signal acquisition system through a cable.
As can be seen from the electrical principle, the voltage amplitude between the excitation electrode 3-1E and the measurement electrode 3-1M is inversely proportional to the conductivity of the fluid inside the sensitive electric field. The sensor is intended to be used in conjunction with the rotatable chamber 6 when in operation, i.e. in a first mode of operation, the conductivity σ of the pure water phase of the fluid is measuredw。
In fig. 1 and 2, the oil-water overflow accumulation selection mechanism is connected with the control unit; the control unit automatically selects or switches an oil phase over-current measurement mode or an oil phase accumulation measurement mode according to the control instruction.
In fig. 1 and 2, the electric conductivity type water content meter 9 is used for measuring the miscible conductivity σ of the fluidm. It is composed of four circular stainless steel electrodes embedded on the inner wall of the insulated pipeline, as shown in figure 4.
FIG. 4 shows the water content of the conductive type in the embodiment of the present inventionA schematic structural diagram is calculated; and as explained in connection with fig. 1 and 2, the outer pair serves as excitation electrodes 4-1a and the middle pair serves as measurement electrodes 4-1b, and the fluid to be measured flows through the inside of the measurement channel of the rotatable cavity 6. An alternating current of constant amplitude is applied between the two excitation electrodes 4-1 a. After the potential difference signal between the two measuring electrodes 4-1b is amplified and filtered, the output voltage signal represents the component and water conductivity change of the oil/water mixture. As can be seen from the electrical principle, the voltage amplitude between the two measuring electrodes 4-1b is inversely proportional to the conductivity of the fluid inside the sensor. When the sensor works, the sensor is required to be matched with the rotatable cavity 6 for use, and in a working mode, the miscible phase conductivity sigma of the fluid can be measuredm。
In fig. 1 and 2, the flow of the dual working mode low yield horizontal well production profile logging combination instrument is composed of a turbine flowmeter 9 and a single-row multi-probe single-phase flow measurement sensor 13. The turbine meter 9 is used to measure the total volumetric flow of the fluid, and the sensor is also operated in the first operating mode. The single-column multi-probe single-phase flow measurement sensor 13 is used for measuring single-phase flow under low liquid yield, and is structurally composed of 7 conductance probes 5-1 which are evenly distributed on the diameter of a circular end face on one side of a rotatable cavity liquid outlet 12 of a rotatable cavity 6, wherein the diameter of the 7 conductance probes 5-1 is vertical to a central connecting line of the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12, as shown in fig. 5.
FIG. 5 is a schematic diagram of a column multi-probe single-phase flow measurement sensor configuration according to an embodiment of the present invention; the sensitive areas of the 7 conductance probes 5-1 are located in the rotatable cavity 6 and the sensor operates in the second mode of operation. The working principle is as follows: under the condition of oil-water stratified flow of a low-liquid-production horizontal well, after oil-water mixed phase fluid flowing in a sleeve 3 flows through a current collector 4, the oil-water mixed phase fluid firstly enters the interior of a logging instrument from a liquid inlet 2 of a combination instrument and then enters the interior of a rotatable cavity from a liquid inlet 7 of a rotatable cavity 6, at the moment, the oil-water mixed phase fluid is influenced by gravity and can be subjected to oil-water separation after entering the instrument, namely the upper layer is an oil phase, and the lower layer is a water phase.
Because the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 of the rotatable cavity 6 are positioned at the bottom of the instrument in the second working mode, at this time, the water phase can continuously enter the cavity from the rotatable cavity liquid inlet 7, and the oil phase is accumulated outside the cavity. Over time, the oil phase will gradually accumulate at the rotatable cavity inlet 7 at the bottom of the rotatable cavity 6 and enter the rotatable cavity inlet 7 into the rotatable cavity 6. At this time, the single-row multi-probe single-phase flow measurement sensor 13 starts to work, and the sensor records the process that the oil phase is accumulated in the cavity after entering the rotatable cavity 6 and finally flows out of the cavity from the rotatable cavity liquid outlet 12. Through the design of the circuit system, when all the probes are immersed in water, the response value is a low value, the oil phase enters the rotatable cavity 6 and begins to immerse the conductance probe 5-1, and the response value of the instrument rises by one step every time the oil-water liquid level immerses one probe 5-1, as shown in fig. 6.
FIG. 6 is a schematic diagram of the response law of a single-column multi-probe single-phase flow measurement sensor according to an embodiment of the present invention; the response values increase with the amount of immersion and accumulate continuously, eventually reaching a maximum value.
Therefore, the height of the oil-water liquid level in the cavity can be obtained in real time by using 7 conductance probes 5-1, and the volume of the cavity corresponding to the height of the probes is fixed, so that the accumulation time of the oil phase in the cavity is calculated to obtain the single-phase flow, and the single-phase flow under the condition of oil-water stratified flow of the low-yield horizontal well can be effectively obtained according to the calculation formula shown in the formula (1).
v＝Iv/It(1)；
In formula (1), v is the volume flow rate of the oil phase;
Ivis the volume of the cavity between the two probes;
Itis the time it takes for the oil phase to submerge two adjacent probes.
More specifically, the working principle of the dual-working-mode low-yield liquid horizontal well production profile logging combination instrument is as follows: firstly, the logging instrument is conveyed to the interval to be measured in the horizontal well through the tractor device, and after production is stable, the current collector 4 is opened through ground control. The ground then drives the rotatable cavity to rotate the drive motor 16, as well asMonitoring the output value of the XYZ axis orientation sensor 15, stopping the rotation of the driving motor 16 when the liquid inlet 7 and the liquid outlet 12 of the rotatable cavity are adjusted to the upper part of the rotatable cavity 6, and then entering the first working mode, after the fluid enters the instrument from the liquid inlet 2 of the combination instrument, the fluid enters the rotatable cavity 6 from the liquid inlet 7 of the rotatable cavity, and when the instrument flows through the full water value sensor 8, the turbine flowmeter 9 and the electric conduction type water content meter 11, the total volume flow Q and the water phase electric conductivity sigma of the fluid can be measuredwElectrical conductivity sigma of oil-water mixed phasem。
When the measurement in the first working mode is finished, the rotatable cavity rotation driving motor 16 is driven to rotate again, the output value of the XYZ axis azimuth sensor 15 is monitored, when the rotatable cavity liquid inlet 7 and the rotatable cavity liquid outlet 12 are adjusted to the lower part of the rotatable cavity 6, the rotatable driving motor 16 is stopped to work, and at the moment, the instrument enters the second working mode. At this time, the single-row multi-probe single-phase flow measurement sensor 13 starts to work, records the process of oil-phase fluid from entering the rotatable cavity liquid inlet 7 to flowing out of the rotatable cavity liquid outlet 12, and can obtain the volume flow of the oil phase according to the response time interval of each probe in the process.
After the test is finished, if the measurement result is not satisfactory, the rotatable driving motor 16 can be driven again to enter the first working mode, the oil phase accumulated in the cavity is released, and the total volume flow Q and the water phase conductivity sigma are measuredwAnd electrical conductivity of oil-water miscible phase sigmamThe fluid parameters are repeatedly measured. And then the rotatable driving motor 16 is driven to enter the second working mode, and the single-phase flow is repeatedly measured until an ideal test result is obtained. After the testing of the interval is finished, the logging combination instrument is conveyed to the next target interval by the tractor equipment to measure the flow and the water content. And finally, after the test is completely finished, lifting the cable, and recovering the logging instrument and the tractor.
In summary, the dual operation mode is a mode switching achieved by rotation of the rotatable cavity 6; the rotatable cavity 6 is rotated by a rotatable cavity rotation driving motor 16; the first working mode and the second working mode are judged by an XYZ-axis azimuth sensor 15; the single-phase flow measurement is realized by adopting the single-row multi-probe single-phase flow measurement sensor 13 in the second working mode.
FIG. 7 is a graph of turbine flow meter response rules for an embodiment of the present invention; the dynamic test is carried out in Daqing oilfield detection center, the test method is that the instrument is placed in a simulated shaft with the inner diameter of 125mm, different liquid phase flow rates are proportioned in the shaft, and response values of the instrument under the different liquid phase flow rates are recorded. As shown in fig. 7, the abscissa is the standard flow rate of the mixture ratio, and the ordinate is the response result of the turbine flowmeter. The turbine flowmeter has better response in the flow range of 0-70m3/d according to the measured data, the response of the instrument and the flow are in a linear relation, the lower limit of the flow measurement can reach 1m3/d, and the test precision can reach 1%.
FIG. 8 is a diagram of the response rule of the conductivity watercut meter according to an embodiment of the present invention; the dynamic experiment medium of the conductivity water content meter is diesel oil and water, the proportioning flow is 3m3/d, 5m3/d, 10m3/d, 15m3/d, 20m3/d, 25m3/d, 30m3/d, 40m3/d, 50m3/d and 60m3/d, the change range of the water content is 10-100%, and the instrument responses under different flow and water content conditions are recorded respectively. In fig. 8, the abscissa is the total proportioning flow, the ordinate is the response value of the water content meter, and different curves represent different oil-water ratios, i.e., water content. As can be seen from FIG. 8, under the horizontal condition, the conductivity water content meter has better response rule and resolution ratio within the range of 10-100% of water content, and the test precision of the instrument can reach within 5%. When the flow is low, the response value of the conductance moisture content meter is slightly higher than the actual moisture content under the influence of oil-water slippage, and the response value of the conductance moisture content meter is consistent with the actual moisture content along with the increase of the flow.
The low-yield liquid horizontal well output profile logging combination instrument with the dual working modes is composed of a collector short circuit and a dual working mode logging combination sensor short circuit, the outer diameter of the instrument is 54mm, and the instrument is suitable for horizontal well output profile tests of various conveying modes such as tractor conveying, oil pipe conveying and coiled tubing conveying. The short circuit outer diameter of the current collector is 54mm, the short circuit outer diameter is a downhole well logging current collecting instrument commonly used in oil fields, the specific implementation mode can refer to an umbrella type current collecting method (CN 201020611183.8), the detailed description is omitted in the invention, and only the specific implementation mode of the short circuit composition of the dual-working-mode well logging combined sensor is described.
FIG. 9 is a schematic diagram of a dual-operation-mode logging combined sensor short-circuit mechanical structure according to an embodiment of the invention. A transition short circuit A-1 is arranged at the connection position of the current collector short circuit and the double-working-mode logging combination instrument short circuit, the outer diameter of the transition short circuit is 54mm, the length of the transition short circuit is 150mm, a window body of 3cm x 2cm is arranged on the outer wall of the transition short circuit A-1, the transition short circuit is mainly used for connecting a current supply line of a current collector motor between the two short circuits in the window body, a cylindrical thin-walled cylinder is sleeved outside the transition short circuit A-1, and the thin-walled cylinder is also provided with a window body of 3cm x 2 cm. When the power supply line is connected, the thin-wall cylinder is rotated to enable the thin-wall cylinder to be overlapped with the window body of the transition short circuit A-1, the internal cavity of the instrument is exposed, and the power supply line is connected. After the power supply wire is connected and placed in the cavity, the thin-wall cylinder is rotated, and the solid part of the thin-wall cylinder covers the window body of the transition short circuit A-1, so that the window body is closed, the wire connection is realized, and fluid is prevented from flowing in or flowing out of the window body. The dual-working-mode logging combined sensor is 1300mm in short circuit length, 54mm in outer diameter and 48mm in inner diameter, a rotatable cavity A-3 is arranged in the dual-working-mode logging combined sensor, 1100mm in length of the rotatable cavity, 46mm in outer diameter and 40mm in inner diameter. Two ends of the outer wall of the rotatable cavity A-3, which are 300mm away from the axial center, are respectively provided with 1 groove, the width of each groove is 2.7mm, the depth of each groove is 1mm, and the grooves are sleeved with grooves
The fluororubber sealing ring 5 has the functions of righting the rotatable cavity A-3 and sealing off an annular space between the rotatable cavity A-3 and the instrument shell so as to force fluid to enter the rotatable cavity from the cavity liquid inlet and flow through the cavity. The baffle ring A-2 is arranged on the short-circuit inner wall of the dual-working-mode logging combination instrument and is away from the rotatable cavity A-31mm, so that the rotatable cavity A-3 is prevented from generating axial displacement in the process of going down a well or testing.
In fig. 9, the rotatable cavity a-3 is divided into 2 sections, one section is a circuit cartridge short and the other section is a cavity short. The short circuit of the circuit cylinder comprises a single-column multi-probe single-phase flow measurement sensor A-7, a circuit system A-8 and a rotary driveThe motor A-10, the circuit cylinder shell A-9, the circuit system and the xyz shaft sensor are all arranged on a plate frame of the circuit cylinder, the circuit cylinder shell is arranged at one end of the circuit cylinder plate frame, and the circuit cylinder shell and the circuit cylinder plate frame are connected through a sealing ring, so that underground fluid can not enter the circuit cylinder. At the other end of the base of the plate frame, there are 14
Threaded hole with sealing surface. Wherein, there are 7 screw holes evenly distributed on the diameter of terminal surface for install 7 single-row many probe single-phase flow measurement sensor probes. The other 7 threaded holes are distributed on the end face outside the diameter and are used for connecting the sealing plugs of the current collector motor and the power supply wires of the sensor group. The sealing plug bottom all has the o type sealing washer, and when the sealing plug was packed into the screw hole, the fluid outside the screw hole was sealed to the o type sealing washer, prevented that the fluid from getting into circuit section of thick bamboo from the screw hole in, had both realized the connection of electric wire, had realized the sealed of circuit section of thick bamboo again. The other end of the circuit cylinder shell A-9 is provided with and fixed with a rotatable motor A-10, the outer diameter of the motor is 35mm, and the power is 20W.
In fig. 9, a cylindrical fixing rod A-12 is sleeved at a rotating shaft of a rotary driving motor A-10, the outer diameter of the fixing rod A-12 is 17mm, sealing is realized between the fixing rod A-12 and a circuit cylinder shell A-9 through an o-shaped ring to prevent fluid from entering a circuit cylinder, and the other end of the fixing rod A-12 is installed on an instrument immovable short-circuit connector. The cavity short circuit is the cylinder that the external diameter is 46mm, and the circuit bobbin frame is connected to the one end of cavity, and cavity internally mounted has turbine flowmeter short circuit, electric conductance moisture content meter and full water value measuring sensor short circuit. The short circuit of the turbine flowmeter is composed of a turbine blade, a turbine support and a Hall element, the outer diameter of the short circuit is 39mm, the Hall element is sealed by epoxy sealant, and a lead is led out to be connected with a sealing plug on the end face of a circuit barrel plate frame. The electric conductance moisture content meter and the full water value measuring sensor are installed on the same short circuit, the short circuit is composed of a coaxial double-layer insulating cylinder, the outer diameter of the outer insulating cylinder is 39mm, the thickness is 1mm, the outer diameter of the inner insulating cylinder is 37mm, the thickness is 2mm, 4 annular electric conductance moisture content meter sensors and 2 full water value measuring electric conductance probes are embedded in the short circuit, and the combined sensor is respectively connected with the sealing plug of the end face of the circuit barrel plate frame by leading out 6 power supply wires.
The above-mentioned embodiments are merely embodiments for expressing the invention, and the description is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes, substitutions of equivalents, improvements and the like can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A low fluid production horizontal well production profile logging combination tool with dual operating modes is characterized by comprising:
a sleeve (3);
the sleeve (3) is internally provided with a combined instrument main body;
a flow guide mechanism is arranged between the combination instrument main body and the sleeve (3);
a first flow channel is arranged between the sleeve (3) and the main body of the combination instrument, a second flow channel is arranged in the main body of the combination instrument, and an oil-water overflowing accumulation selection mechanism and a measurement mechanism are arranged in the second flow channel;
the oil-water overflowing accumulation selecting mechanism selects or switches an oil phase overflowing measuring mode or an oil phase accumulating measuring mode;
the measuring mechanism is used for measuring the fluid flow and the water content in the phase flow measuring mode or the oil phase accumulation measuring mode;
the measuring mechanism includes: a full water value measuring sensor (8), an electric conduction type water content meter (11), a turbine flowmeter (9) and a single-phase flow measuring sensor;
the total water value measuring sensor (8) is used for measuring the conductivity of the water phase;
the electric conduction type water content meter (11) is used for measuring the oil-water mixed phase conductivity;
the turbine flowmeter (9) is used for measuring the total volume flow of the fluid;
a single-phase flow rate measuring sensor for measuring a single-phase flow rate at a low liquid production rate;
the flow guide mechanism is used for guiding the fluid in the first flow passage into the second flow passage;
the oil-water overflowing accumulation selection mechanism is a rotatable cavity (6), and the measuring mechanism is arranged in the rotatable cavity (6);
a rotatable cavity liquid inlet (7) and a rotatable cavity liquid outlet (12) are formed in the outer side of the rotatable cavity (6);
rotating the rotatable cavity (6), and entering an oil phase overflow measurement mode when a liquid inlet (7) of the rotatable cavity is arranged on the upper side of the rotatable cavity (6); entering the oil phase accumulation measurement mode when a rotatable cavity liquid inlet (7) is at the lower side of the rotatable cavity (6);
wherein the liquid inlet (7) of the rotatable cavity and the liquid outlet (12) of the rotatable cavity are arranged on the same side;
one end of the rotatable cavity (6) is connected with a rotating mechanism;
the rotating mechanism is used for driving the rotatable cavity (6) to rotate to a specified position;
the appointed position is that the liquid inlet (7) of the rotatable cavity is arranged at the lower side of the rotatable cavity (6) or the liquid inlet (7) of the rotatable cavity is arranged at the upper side of the rotatable cavity (6);
after the test is finished, if the measurement result is not satisfactory, the rotatable cavity can be driven again to rotate the driving motor (16), the oil phase overflowing measurement mode is entered, the oil phase accumulated in the cavity is released, and the parameters of the total volume flow, the water phase conductivity and the oil-water mixed phase conductivity fluid are repeatedly measured; then, the rotatable cavity is driven to rotate to drive the motor (16) to enter the oil phase accumulation measurement mode, and single-phase flow is repeatedly measured until an ideal test result is obtained;
wherein the low yield liquid is 1m3/d～10m3/d。
2. The low yield horizontal well production profile logging combination tool with dual modes of operation of claim 1, wherein:
the outer side of the rotatable cavity (6) is provided with a combiner shell (5);
the inner side of the combiner shell (5) and the inner side of the rotatable cavity (6) are the second flow channel;
the outer side of the combination instrument shell (5) is provided with the flow guide mechanism.
3. The low yield horizontal well production profile logging combination tool with dual modes of operation of claim 2, wherein:
one end of the combination instrument shell (5) is provided with a combination instrument liquid inlet (2), and the other end of the combination instrument shell (5) is provided with a combination instrument liquid outlet (18);
the flow channels of the liquid inlet (2) and the liquid outlet (18) of the combination instrument are the second flow channels;
the flow guide mechanism is arranged between the liquid inlet (2) of the combination instrument and the liquid outlet (18) of the combination instrument.
4. The low yield horizontal well production profile logging combination tool with dual modes of operation of claim 1, wherein:
the rotatable cavity (6) further comprising: an XYZ-axis orientation sensor (15);
the XYZ-axis orientation sensor (15) measures a position of a rotatable cavity liquid inlet (7) of the rotatable cavity (6).
5. The low yield horizontal well production profile logging combination tool with dual modes of operation of claim 1, wherein: the rotary mechanism includes: a rotatable cavity rotation driving motor (16), a hollow fixed rod (17) and a fixed short circuit (19);
one end of the rotatable cavity rotation driving motor (16) is connected with the rotatable cavity (6), the other end of the rotatable cavity rotation driving motor (16) is arranged in the hollow immobile rod (17), and the hollow immobile rod (17) is connected with the immobile short circuit (19).
6. The low yield horizontal well production profile logging combination tool with dual modes of operation of claim 1, wherein:
the water conservancy diversion mechanism includes: a current collector (4);
the current collector (4) is connected with a current collector motor drive short circuit (1);
the collector motor driving short circuit (1) drives the collector (4) to guide the fluid in the first flow passage into the second flow passage.
7. The low fluid production horizontal well production profile logging combination instrument with the dual working modes according to any one of claims 1 to 6, wherein:
the oil-water overflowing accumulation selection mechanism is connected with the control unit;
and the control unit automatically selects or switches the oil phase over-current measurement mode or the oil phase accumulation measurement mode according to a control instruction.
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| CN109653743B (en) * | 2018-11-02 | 2022-03-01 | 中国石油天然气股份有限公司 | Double-sensor combined real-time water content measuring system for well logging of liquid production profile |
| CN114412443B (en) * | 2022-01-24 | 2024-04-05 | 燕山大学 | Horizontal well gas-liquid two-phase flow accumulating type modularized parameter logging instrument and control system |
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Effective date of registration: 20200922 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: PetroChina Co.,Ltd. Patentee after: Daqing Oilfield Co.,Ltd. Address before: No. 233, south section of zhongyang street, rang Road District, Daqing City, Heilongjiang Province Patentee before: Daqing Oilfield Co.,Ltd. |
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