CN210003265U - permeability measuring device based on coupling of artificial cracks and natural cracks - Google Patents

permeability measuring device based on coupling of artificial cracks and natural cracks Download PDF

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CN210003265U
CN210003265U CN201822118871.XU CN201822118871U CN210003265U CN 210003265 U CN210003265 U CN 210003265U CN 201822118871 U CN201822118871 U CN 201822118871U CN 210003265 U CN210003265 U CN 210003265U
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pressure
chamber
flow guiding
square
fracture
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王晓明
陈军斌
李育
张金元
刘京
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Xian Shiyou University
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Xian Shiyou University
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Abstract

The utility model provides an kinds of permeability measuring device under artificial fracture and natural fracture coupling, the rerum natura under artificial fracture and the natural fracture coupling measures technical field is related to, square diversion room has been adopted, and HXDL-2C type proppant fracture evaluation system, the complexity of equipment system connection has effectively been reduced and the accuracy of measured data record has been improved, it can carry out reasonable optimization to the fracture under the indoor conditions, so that rationally fracturing to tight reservoir, the validity of field operation has been improved, can accurately measure the permeability that contains the tight reservoir of natural fracture after the fracturing, core holder structure and measuring method's limitation among the prior art has been overcome, simultaneously, based on artificial fracture and natural fracture coupling under, realize the reasonable optimization to tight reservoir artificial fracture, improved in the past to the measuring device of underground reservoir core permeability, reach the high-efficient development to tight reservoir oil gas.

Description

permeability measuring device based on coupling of artificial cracks and natural cracks
Technical Field
The utility model relates to a rerum natura under artificial crack and the natural crack coupling measures technical field, in particular to kinds of permeability measuring device based on artificial crack and natural crack coupling down.
Background
The permeability is which is the most important parameter in reservoir physical property characteristic research, and the measurement of the core permeability is works which are necessary for reservoir evaluation, development scheme design, numerical simulation and capacity rating.
The instrument for measuring the permeability of the reservoir in the laboratory to be standard is a 'conventional core holder', the device is only based on the permeability test under the conditions of -dimensional confining pressure or -dimensional confining pressure and axial pressure, the internal volume of the device is small, and the requirements on the size and the shape of a rock sample are extremely accurate.
For compact reservoirs and unconventional reservoirs, artificial fracturing is required to be performed and the accuracy of the artificial fracturing is ensured to realize the efficient exploitation of oil and gas, the compact reservoirs containing natural fractures are required to be subjected to reasonable and efficient fracturing to ensure the accuracy of the artificial fracturing, and the permeability parameters can just reflect the efficient fracturing. However, the limitations of the structural space and the measurement method of the existing instrument cannot reasonably realize the accurate measurement of the permeability of the fractured compact reservoir containing natural fractures, and based on the current situation, the application aims to overcome the limitations of the core holder structure and the measurement method. Meanwhile, based on the coupling of the artificial fractures and the natural fractures, the artificial fractures of the tight reservoir are reasonably optimized, the previous measuring device for the permeability of the underground reservoir core is improved, and the efficient development of oil and gas of the tight reservoir is achieved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an kinds of permeability measuring device based on under artificial crack and the coupling of natural crack for solve the problem that exists among the prior art.
A permeability measuring device based on coupling of artificial fractures and natural fractures, comprising:
the hydraulic system of the diversion chamber is a hydraulic frame comprising two parallel plates, and the pressure is controlled by a computer end;
the pressure measuring chamber comprises a square flow guiding chamber system, the square flow guiding chamber system comprises an upper layer base plate, a flow guiding chamber and a lower layer base plate, a square groove is formed in the middle of the lower layer base plate, inward horizontal protrusions are arranged on the periphery of the bottom of the square flow guiding chamber, a lower piston embedded with the protrusions of the bottom of the square flow guiding chamber is embedded into the lower layer base plate from bottom to top, the height of the lower piston is equal to that of the lower layer base plate, a sealing strip is filled between the lower piston and the lower layer base plate, rings of blocking strips vertical to the flow guiding chamber are arranged on the edge of the upper surface of the square groove of the lower layer base plate, the flow guiding chamber is fixed at the upper end of the edge of the lower layer base plate by screws, 2 rings of square sealing strips with the same height as the inner portion of the flow guiding chamber are laid into the flow guiding chamber, the blocking strips are tightly attached to the lower surface of the square sealing strip, a lower rock plate, a supporting agent and an upper rock plate are sequentially placed into the flow guiding chamber, a plurality of the flow guiding chamber is provided with a square sealing strip, a pressure measuring chamber, a pressure inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet, a pressure measuring pressure;
the outlet metering system comprises a container, a stopwatch, an electronic pressure meter and an electronic balance, when the confining pressure is applied to the specified pressure by the ring pressure pump and is stable, the flow of the liquid flowing out of the outlet end is tested, and the data of the electronic pressure meter and the electronic balance at the moment are observed and recorded;
the computer data acquisition control and processing system firstly adjusts the position of the displacement sensor and inputs related parameter points before the start of an experiment according to the prompt of a data acquisition area interface, sets the closing pressure according to the requirement of the experiment and clicks for determination, sets the flow of the fluid injection pump after the closing pressure is added to the normal pressure, and starts the system.
Preferably, the rock sample adopts natural marble with strong compactness as a reservoir rock sample, and the size standard of the rock sample is 17.3cm in length, 3.8cm in width and 4.7cm in height;
preferably, the temperature at the time of measurement is 24 ℃;
preferably, the inlet end of the diversion chamber is fed with distilled water.
Compared with the prior art, the utility model following beneficial effect has: the defect of reasonable optimization of the current cracks is well overcome, and due to the adoption of the square flow guide chamber and the HXDL-2C type proppant crack evaluation system, the complexity of equipment system connection is effectively reduced, and the accuracy of measured data recording is improved. The method can reasonably optimize the fracture under indoor conditions so as to reasonably fracture the compact reservoir, improve the effectiveness of field operation, accurately measure the permeability of the compact reservoir containing the natural fracture after fracturing, and overcome the limitations of the core holder structure and the measuring method in the prior art. Meanwhile, based on the coupling of the artificial fractures and the natural fractures, the artificial fractures of the tight reservoir are reasonably optimized, the previous measuring device for the permeability of the underground reservoir core is improved, and the efficient development of oil and gas of the tight reservoir is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of the principle provided by the embodiment of the present invention;
fig. 2 is an assembly view of a diversion chamber according to an embodiment of the present invention;
FIG. 3 is a front and back structure view of the backing plate according to the embodiment of the present invention;
fig. 4 is a rock sample structure diagram provided by the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of , but not all embodiments.
Referring to fig. 1 to 4, the embodiment of the present invention provides kinds of permeability measuring devices based on artificial fracture and natural fracture coupling, including:
the hydraulic system of the diversion chamber is a hydraulic frame comprising two parallel plates, and the pressure is controlled by a computer end;
the square diversion chamber system comprises an upper diversion chamber 1, a diversion chamber 2 and a lower diversion chamber 3, wherein a square groove 4 is arranged in the middle of the lower diversion chamber 3, inward horizontal protrusions 5 are arranged on the periphery of the bottom of the diversion chamber, a lower piston 6 which is embedded with the protrusions 5 on the bottom of the groove is embedded in the lower diversion chamber 3 from bottom to top, the height of the lower piston 6 is the same as that of the lower diversion chamber 3, a sealing strip 7 is filled between the lower piston 6 and the lower diversion chamber 3, rings of barrier strips 8 which are vertical to the diversion chamber 2 are arranged on the edge of the upper surface of the square groove 4 of the lower diversion chamber 3, the diversion chamber 2 which is in an annular cuboid is fixed by screws at the upper end of the edge of the lower diversion chamber 3, rings of square sealing strips 7 which are attached to the interior of the diversion chamber 2 and have the same height are laid in the diversion chamber 2, barrier strips 8 of the lower sealing strips 7 are closely attached to the lower surface of the square sealing strips 7, a lower surface of the square sealing strips 7 is closely attached to the upper diversion chamber 2, a lower baffle strip is sequentially placed in the diversion chamber 2, a lower baffle strip, a lower rock plate, a lower baffle plate, a pressure inlet tube, a pressure sensor, a pressure gauge;
the outlet metering system comprises a container, a stopwatch, an electronic pressure meter and an electronic balance, when the confining pressure is applied to the specified pressure by the ring pressure pump and is stable, the flow of the liquid flowing out of the outlet end is tested, and the data of the electronic pressure meter and the electronic balance at the moment are observed and recorded;
the computer data acquisition control and processing system refers to a proppant fracture long-term evaluation system and a data acquisition program in a computer, the position of a displacement sensor is adjusted and related parameter points are input before an experiment is started according to the prompt of a data acquisition area interface, the closing pressure is set according to the requirement of the experiment and is clicked for determination, the flow of a fluid injection pump is set after the closing pressure is added to be normal, and the system is started.
The measuring device adopts an API linear flow measuring method, wherein the confining pressure of a ring pressure pump is increased to 2.5MPa, a main switch in an operation panel in HXDL-2C type proppant crack evaluation is opened, a pressure compensation system is started, the set closing pressure is input into the interface of a computer test system, the set closing pressure is 10MPa, 20MPa, 30MPa, 40MPa or 50MPa, a constant flow pump is opened to set the flow rate, the set flow rate is 2.5ml/min, 3.0ml/min or 3.5ml/min, and when liquid completely passes through a square diversion chamber 2 and liquid drops can stably drip, the flow quality of the liquid per minute begins to be recorded; the rock sample adopts natural marble with strong compactness as a reservoir rock sample, and the size standards of the rock sample are that the length is 17.3cm, the width is 3.8cm and the height is 4.7 cm; the temperature during measurement is 24 ℃, and distilled water is input into the inlet end of the diversion chamber 2.
permeability measurement methods based on coupling of artificial fractures and natural fractures, which specifically comprise the following steps:
placing the assembled square diversion chamber 2 filled with the rock sample in a diversion chamber hydraulic system;
opening a main power switch of an instrument control box, a pressure compensation system control switch, a power switch of a diversion chamber hydraulic system, a power switch of an outlet automatic metering system and a power switch of a computer;
opening a proppant fracture long-term evaluation system control and data acquisition program after a computer is started, adjusting the position of a displacement sensor and inputting related parameter points before starting an experiment according to the interface prompt of a data acquisition area, setting closing pressure according to the requirement of the experiment and clicking to determine, setting the flow of a fluid injection pump after the closing pressure is added to be normal, and starting;
opening a switch of a liquid measurement diversion line valve , opening a pressure valve after an upper plate of a diversion chamber hydraulic system is contacted with the square diversion chamber 2, closing an emptying valve, and setting a tested closing pressure;
after the closing pressure is set, the ring pressure pump adds confining pressure to the specified pressure, after the pressure is stabilized, the testing flow is set to start testing, data on the electronic pressure gauge and the electronic balance are observed and recorded, and after the data are stabilized, the data are accurately recorded;
after the flow under the pressure at the inlet end and the outlet end of the diversion chamber 2 is measured, the Darcy formula of the planar -dimensional seepage is taken as a theoretical basis to ensure that gas seeps through the rock sample in a laminar flow state, and the permeability of different artificial cracks and natural cracks in the rock sample under the communication relationship is determined according to a gas permeability formula:
Figure DEST_PATH_GDA0002282671190000071
wherein K is the permeability (unit: 10)-10m2) And Q is an outlet liquid flow rate (unit: cm3In,/s), μ is the fluid viscosity (unit: mPa · s), h is the dimension height of the rock sample (unit: cm), t is the proppant thickness (unit: cm), P)An inletIs the pressure (unit: KPa) at the inlet end of the flow guide chamberAn outletThe pressure (unit: KPa) at the outlet end of the diversion chamber is shown, wherein 17.3 is the length (unit: cm) of the rock sample, and 3.8 is the width (unit: cm) of the rock sample.
Having thus described the preferred embodiments of the present invention, additional variations and modifications of these embodiments may occur to those skilled in the art upon learning of the basic inventive concepts .
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

  1. permeability measuring devices based on coupling of artificial cracks and natural cracks are characterized by comprising a diversion chamber hydraulic system, a square diversion chamber system, an outlet metering system and a computer data acquisition control and processing system;
    the hydraulic system of the diversion chamber is a hydraulic frame comprising two parallel plates, and the pressure is controlled by a computer end;
    the pressure measuring chamber comprises a square flow guiding chamber system, the square flow guiding chamber system comprises an upper layer base plate, a flow guiding chamber and a lower layer base plate, a square groove is formed in the middle of the lower layer base plate, inward horizontal protrusions are arranged on the periphery of the bottom of the square flow guiding chamber, a lower piston embedded with the protrusions of the bottom of the square flow guiding chamber is embedded into the lower layer base plate from bottom to top, the height of the lower piston is equal to that of the lower layer base plate, a sealing strip is filled between the lower piston and the lower layer base plate, rings of blocking strips vertical to the flow guiding chamber are arranged on the edge of the upper surface of the square groove of the lower layer base plate, the flow guiding chamber is fixed at the upper end of the edge of the lower layer base plate by screws, 2 rings of square sealing strips with the same height as the inner portion of the flow guiding chamber are laid into the flow guiding chamber, the blocking strips are tightly attached to the lower surface of the square sealing strip, a lower rock plate, a supporting agent and an upper rock plate are sequentially placed into the flow guiding chamber, a plurality of the flow guiding chamber is provided with a square sealing strip, a pressure measuring chamber, a pressure inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet, a pressure measuring chamber inlet pipe, a pressure measuring chamber inlet, a pressure measuring pressure;
    the outlet metering system comprises a container, a stopwatch, an electronic pressure meter and an electronic balance, when the confining pressure is applied to the specified pressure by the ring pressure pump and is stable, the flow of the liquid flowing out of the outlet end is tested, and the data of the electronic pressure meter and the electronic balance at the moment are observed and recorded;
    the computer data acquisition control and processing system firstly adjusts the position of the displacement sensor and inputs related parameter points before the start of an experiment according to the prompt of a data acquisition area interface, sets the closing pressure according to the requirement of the experiment and clicks for determination, sets the flow of the fluid injection pump after the closing pressure is added to the normal pressure, and starts the system.
  2. 2. The apparatus of claim 1, wherein the rock sample is formed of dense natural marble and has a size of 17.3cm long, 3.8cm wide and 4.7cm high.
  3. 3. The apparatus of claim 1, wherein the temperature at the time of measurement is 24 ℃.
  4. 4. The apparatus of claim 1, wherein the inlet end of the baffle compartment is fed with distilled water.
CN201822118871.XU 2018-12-17 2018-12-17 permeability measuring device based on coupling of artificial cracks and natural cracks Expired - Fee Related CN210003265U (en)

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Application Number Priority Date Filing Date Title
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