CN111912756B - Measuring device and measuring method for core pore compression coefficient - Google Patents
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- 239000011148 porous material Substances 0.000 title claims abstract description 113
- 230000006835 compression Effects 0.000 title claims abstract description 102
- 238000007906 compression Methods 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 13
- 239000008398 formation water Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011800 void material Substances 0.000 claims 3
- 238000011161 development Methods 0.000 abstract description 12
- 238000013461 design Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 16
- 230000008859 change Effects 0.000 description 8
- 239000011435 rock Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
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- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0085—Compressibility
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Abstract
The application provides a measuring device and a measuring method for core pore compression coefficient, wherein the measuring device comprises: the device comprises a plunger metering pump, an intermediate container, a first pressure sensor, a second pressure sensor, a processing device and a core holder; the first air valve of the plunger metering pump is connected with the confining pressure inlet of the core holder through a pipeline, and the second air valve of the plunger metering pump is connected with the inlet of the intermediate container through a pipeline; the outlet of the middle container is connected with the inlet of the core holder through a pipeline; the first pressure sensor is arranged on a pipeline between the plunger metering pump and the core holder, and the second pressure sensor is arranged on a pipeline between the intermediate container and the core holder. According to the method, the measurement accuracy and the test efficiency of the core pore compression coefficient can be improved, the calculation accuracy of the dynamic reserves of the gas reservoir is improved, the measuring device is simple in structure and convenient to operate, is suitable for measuring the pore compression coefficient of the reservoir on site and in a large batch, and provides basic data for the design of the development scheme of the gas reservoir.
Description
Technical Field
The invention relates to the technical field of gas reservoir reserves calculation, in particular to a device and a method for measuring a core pore compression coefficient.
Background
The compression coefficient of the reservoir pore is an important parameter for oil and gas reservoir development, is also a key parameter for carrying out natural energy evaluation, recovery ratio prediction and dynamic reserve calculation, and is particularly high in the case of abnormal high-pressure gas reservoirs, the compression coefficient of the reservoir pore determines the relative size of the dynamic reserve calculation of the gas reservoir, and the accurate acquisition of the compression coefficient of the reservoir pore is very critical and is generally determined through a compression coefficient measurement experiment of the reservoir core pore.
Currently, the compression coefficient of the core pore is determined by mainly changing the pressure or confining pressure of the core pore to determine the fluid outflow quantity, and the reservoir pore compression coefficient is determined according to the fluid outflow quantity.
However, in the case of low porosity cores, because of the small core pore volume, the displaced fluid outflow is small, and the measured fluid outflow is difficult or has large errors, resulting in low accuracy in the measured core pore compression coefficients.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the measuring device and the measuring method for the core pore compression coefficient, which can improve the precision of the measured core pore compression coefficient, thereby improving the precision of the compression coefficient of the reservoir pore, further improving the judgment precision of the dynamic reserve of the gas reservoir, and having important significance for accurately evaluating the development effect of the gas reservoir, accurately predicting the development dynamics of the gas reservoir and making the development planning of the gas reservoir.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a device for measuring a core pore compression coefficient, including:
the device comprises a plunger metering pump, an intermediate container, a first pressure sensor, a second pressure sensor, a processing device and a core holder;
the first air valve of the plunger metering pump is connected with the confining pressure inlet of the core holder through a pipeline, and the second air valve of the plunger metering pump is connected with the inlet of the intermediate container through a pipeline; the outlet of the middle container is connected with the inlet of the core holder through a pipeline;
the first pressure sensor is arranged on a pipeline between the plunger metering pump and the core holder, and the second pressure sensor is arranged on a pipeline between the intermediate container and the core holder;
the middle container stores stratum water, the first pressure sensor and the second pressure sensor send collected data to the processing device, and the processing device is used for calculating a core pore compression coefficient according to the received data.
Further, a first valve is mounted on the conduit of the outlet of the core holder.
Further, a second valve is mounted on the conduit between the plunger metering pump and the first pressure sensor.
Further, a third valve is mounted on the conduit between the intermediate container and the second pressure sensor.
In a second aspect, the present invention provides a method for measuring a core pore compression coefficient, where the method is based on the device for measuring a core pore compression coefficient, and includes:
placing a core sample into a core holder, applying confining pressure to the core sample through a confining pressure inlet of the core holder, and closing the confining pressure inlet of the core holder after the confining pressure reaches a first preset pressure value;
injecting formation water from an inlet of the core holder and displacing the core sample until the formation water continuously flows out from an outlet of the core holder;
injecting formation water from an inlet of the core holder and closing an outlet of the core holder until the axial pressure of the core sample reaches a second preset pressure value, and closing the inlet of the core holder;
opening a confining pressure inlet of the core holder and changing confining pressure applied to a core sample by a preset step length;
and determining each axial pressure corresponding to each confining pressure, and calculating each compression coefficient according to each confining pressure and each axial pressure.
Further, the placing the core sample into the core holder and applying confining pressure to the core sample through the confining pressure inlet of the core holder includes:
the core sample is placed in the core holder and confining pressure is applied to the core sample by the plunger metering pump through a confining pressure inlet of the core holder.
Further, the injecting and displacing the formation water from the inlet of the core holder until the formation water continuously flows out from the outlet of the core holder comprises:
and applying internal pressure to the intermediate container for storing the formation water by using a plunger metering pump, so that the formation water in the intermediate container is injected from the inlet of the core holder and displaces the core sample until the formation water continuously flows out from the outlet of the core holder.
Further, the opening the confining pressure inlet of the core holder and changing the confining pressure applied to the core sample by a preset step length includes:
opening the confining pressure inlet of the core holder and increasing confining pressure applied to the core sample by a preset step.
Further, the confining pressure and the axial pressure exerted on the core sample are measured by pressure sensors.
Further, the first preset pressure value is greater than the second preset pressure value.
According to the technical scheme, the measuring device and the measuring method for the core pore compression coefficient are provided, fluid outflow is not required to be measured when the core pore compression coefficient is measured, measuring precision and testing efficiency of the core pore compression coefficient are improved, precision of the compression coefficient of a reservoir pore is greatly improved, and further calculation precision of dynamic reserves of a gas reservoir is improved; and the measuring device has the advantages of few constituent equipment, simple structure and convenient operation, is suitable for measuring reservoir pore compression coefficients in site and in large batch, and provides basic data for the design of a petroleum reservoir development scheme.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a device for measuring core pore compression coefficient according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for measuring a core pore compression coefficient according to an embodiment of the present invention;
FIG. 3 is a graph showing the change of confining pressure and pore pressure in a method for measuring the pore compression coefficient of a core according to an embodiment of the present invention;
FIG. 4 is a graph showing the variation of the confining pressure and pore pressure stability values in the method for measuring the core pore compression coefficient according to the embodiment of the present invention;
fig. 5 is a graph of compression coefficients in a method for measuring a core pore compression coefficient according to an embodiment of the present invention.
Reference numerals:
10. a plunger metering pump;
20. an intermediate container;
30. a first pressure sensor;
40. a second pressure sensor;
50. a processing device;
60. a core holder;
601. a first valve;
602. a second valve;
603. and a third valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Currently, the compression coefficient of the core pore is measured by mainly changing the pressure or confining pressure of the core pore to measure the fluid outflow, and the reservoir pore compression coefficient is determined according to the fluid outflow, and for the core with low porosity, the accuracy of the measured core pore compression coefficient is low because the core pore volume is small, the fluid outflow of the displacement is small, the fluid outflow is difficult to measure or the error is large. In consideration of the problems existing in the prior art of measuring the compression coefficient of the core pore, the invention provides the measurement device and the measurement method of the compression coefficient of the core pore, which can improve the measurement precision and the measurement efficiency of the compression coefficient of the core pore without measuring the outflow amount of fluid during the measurement of the compression coefficient of the core pore, greatly improve the precision of the compression coefficient of the reservoir pore and further improve the calculation precision of the dynamic reserve of a gas reservoir; and the measuring device has the advantages of few constituent equipment, simple structure and convenient operation, is suitable for measuring reservoir pore compression coefficients in site and in large batch, and provides basic data for the design of a petroleum reservoir development scheme.
In order to improve the measurement accuracy and the test efficiency of the core pore compression coefficient and further improve the calculation accuracy of the dynamic reserve of the gas reservoir, the invention provides an embodiment of a core pore compression coefficient measuring device, referring to fig. 1, which specifically comprises the following contents:
a plunger metering pump 10, an intermediate container 20, a first pressure sensor 30, a second pressure sensor 40, a processing device 50, and a core holder 60;
in this embodiment, the plunger metering pump 10 adopts an ISCO pump, and the processing device 50 is a computer, where the core holder 60 is mainly used for holding a core, and is divided into a core holder with a diameter of 2.5cm, a core holder with a diameter of 3.8cm, and a core holder with a diameter of 10cm according to the size of the core; the intermediate container 20 is used for containing stratum water; the plunger metering pump 10 is used for confining pressure to the core, and applying axial pressure to the core through the intermediate container 20 and saturating the core with formation water; the first pressure sensor 30 and the second pressure sensor 40 are used to monitor the confining pressure and the axial pressure by which the core pore pressure is characterized.
Wherein, a first air valve of the plunger metering pump 10 is connected with a confining pressure inlet of the core holder 60 through a pipeline, and a second air valve of the plunger metering pump 10 is connected with an inlet of the intermediate container 20 through a pipeline; the outlet of the intermediate container 20 is connected with the inlet of the core holder 60 through a pipeline; a first valve 601 is installed on a pipe of the outlet of the core holder 60, and the first valve 601 is used to switch the outlet of the core holder 60.
The first pressure sensor 30 is arranged on a pipeline between the plunger metering pump 10 and the core holder 60, and a second valve 602 is arranged on the pipeline between the plunger metering pump 10 and the first pressure sensor 30, and the second valve 602 is used for switching a confining pressure inlet of the core holder 60.
The second pressure sensor 40 is disposed on the tubing between the intermediate reservoir 20 and the core holder 60; a third valve 603 is installed on the pipe between the intermediate container 20 and the second pressure sensor 40, and the third valve 603 is used to switch the inlet of the core holder 60.
The intermediate container 20 stores formation water, the first pressure sensor 30 and the second pressure sensor 40 both send collected data to the processing device 50, and the processing device 50 is configured to calculate a core pore compression coefficient according to the received data.
As can be seen from the above description, the device for measuring the core pore compression coefficient provided by the embodiment of the invention does not need to measure the outflow amount of fluid when measuring the core pore compression coefficient, only needs to measure the pressure change, and improves the measurement accuracy of the core pore compression coefficient; the device has the advantages of few experimental equipment, no special experimental equipment, simple operation, low cost and rapidness, greatly improves the precision of the compression coefficient of the reservoir pore, is suitable for measuring the compression coefficient of the reservoir pore on site and in large batches, and provides basic data for the design of the oil and gas reservoir development scheme.
In order to improve the measurement accuracy and the test efficiency of the core pore compression coefficient and further improve the calculation accuracy of the dynamic reserve of the gas reservoir, the invention provides an embodiment of a method for measuring the core pore compression coefficient, wherein the method for measuring the core pore compression coefficient is based on the device for measuring the core pore compression coefficient in the embodiment, and referring to fig. 2, the method specifically comprises the following steps:
s101: placing a rock core into a rock core holder, applying confining pressure to the rock core through a confining pressure inlet of the rock core holder, and closing the confining pressure inlet of the rock core holder after the confining pressure reaches a first preset pressure value;
in the step, a core to be measured is placed in a core holder, confining pressure is applied to the core in the core holder by a plunger metering pump, and after the applied confining pressure reaches a first preset pressure value, the pressure is stopped and a confining pressure inlet of the core holder is closed.
The purpose of applying the confining pressure (ring pressure, confining pressure) is to prevent the fluid in the core from flowing out from the side of the core, that is, to make the fluid permeate in the pores of the core, and the inlet flows in and the outlet flows out. The magnitude of the first preset pressure value should in theory not only ensure that the fluid does not flow out from the side of the core, but also not crush the core, and the specific value is determined according to the requirements of sample feeders. In this embodiment, the first preset pressure value is 10MPa.
Of these, the plunger metering pump is preferably an ISCO pump.
S102: injecting formation water from an inlet of the core holder and displacing the core until the formation water continuously flows out from an outlet of the core holder;
s103: injecting formation water from an inlet of the core holder and closing an outlet of the core holder until the axial pressure of the core reaches a second preset pressure value, and closing the inlet of the core holder;
in the above steps S102 and S103, the internal pressure is applied to the intermediate tank storing the formation water by the plunger metering pump, and the applied internal pressure causes the formation water in the intermediate tank to be injected from the inlet of the core holder and displace the core until the formation water continuously flows out from the outlet of the core holder. The purpose is to fill the stratum water in the core pore.
And closing the outlet of the core holder, and continuously injecting the stratum water until the axial pressure of the core reaches a second preset pressure value, and stopping injecting the stratum water. It should be noted that the continuously injected formation water increases the axial pressure of the core, so that the core in the core holder reaches the state of saturated formation water, wherein the specific value of the second preset pressure value is determined according to the requirement of the sample presentation personnel, and the first preset pressure value is greater than the second preset pressure value, preferably, the second preset pressure value is 5MPa lower than the first preset pressure value.
S104: opening a confining pressure inlet of the core holder and changing confining pressure applied to the core by a preset step;
in this step, the confining pressure and the axial pressure are applied to the core through the steps, so that the axial pressure is changed under the condition of changing the confining pressure, and the formation water flows out from the two ends of the core saturated with the formation water. And calculating the compression coefficient transformation of the core pore according to the change of the confining pressure and the change of the axial pressure. In this embodiment, the confining pressure applied to the core is increased by opening the confining pressure inlet of the core holder and by a preset step.
S105: and determining each axial pressure corresponding to each confining pressure, and calculating each compression coefficient according to each confining pressure and each axial pressure.
In this step, according to the uncollection S104, by opening the confining pressure inlet of the core holder and increasing the confining pressure applied to the core by a preset step, and determining the axial pressure corresponding to each confining pressure applied to the core, the specific operation is as follows:
according to the set confining pressure value P 1 ，P 2 ，P 3 ，....，P n Confining pressure is applied to the rock core by using a plunger metering pump, pores of the rock core are compressed in the confining pressure applying process, and the pore pressure P also changes, as shown in fig. 3, every 1 confining pressure P is applied i After the pore pressure p tends to be stable, the pore pressure stabilizing value p is recorded i Then, the confining pressure is continuously added, and the steps are repeated until all confining pressures are measured, and a change curve of confining pressure and pore pressure stable values shown in fig. 4 is drawn.
The change in pore pressure of the core was represented by measuring the change in axial pressure of the core.
According to each confining pressure and each axial pressure, the compression coefficient of each core pore under different pressure conditions is calculated by adopting the following formula:
wherein, according to the law of volume expansion and compression, the confining pressure P i-1 Pore pressure p i-1 To confining pressure P i And pore pressure p i At the time, the core pore compression volume V 1 And water body compression volume V 2 The following are provided:
V 1 ＝V p C f ((P i -p i )-(P i-1 -p i-1 ))；
V 2 ＝V p C w (p i -p i-1 )；
wherein V is p The pore volume of the core is the unit mL in the standard state; c (C) f Is the core pore compression coefficient; c (C) w The compression coefficient of water is 4×10 in this embodiment -4 /MPa。
According to the law of constant volume, the compression volume of the core pore is equal to the compression volume of the water body, namely:
V p C f ((P i -p i )-(P i-1 -p i-1 ))＝V p C w (p i -p i-1 )；
namely:
according to the formula, the compression coefficients of core pores under different pressure conditions can be calculated, and a compression coefficient and effective stress curve is drawn and used for calculating relevant parameters in oil and gas reservoir development design.
The compression coefficients of the core pores under different pressure conditions are also referred to as compression coefficients of the core pores with different effective stresses, wherein the effective stresses are defined as differences between confining pressure and pore pressure.
As shown in fig. 5, the compression coefficient curves are plotted according to the compression coefficients of core pores with different effective stresses.
Further, in this embodiment, the confining pressure and the axial pressure applied to the core are measured by pressure sensors.
As can be seen from the above description, the present invention provides a method for measuring a pore compression coefficient of a core, by placing the core into a core holder and applying confining pressure to the core through a confining pressure inlet of the core holder, and closing the confining pressure inlet of the core holder after the confining pressure reaches a first preset pressure value; injecting formation water from an inlet of the core holder and displacing the core until the formation water continuously flows out from an outlet of the core holder; injecting formation water from an inlet of the core holder and closing an outlet of the core holder until the axial pressure of the core reaches a second preset pressure value, and closing the inlet of the core holder; opening a confining pressure inlet of the core holder and changing confining pressure applied to the core by a preset step; each axial pressure corresponding to each confining pressure is determined, each compression coefficient is calculated according to each confining pressure and each axial pressure, fluid outflow is not required to be measured when the core pore compression coefficient is measured, measurement accuracy and test efficiency of the core pore compression coefficient are improved, accuracy of the compression coefficient of a reservoir pore is greatly improved, and the method is suitable for measuring the reservoir pore compression coefficient on site and in large batches and provides basic data for oil and gas reservoir development scheme design.
Based on the above, the invention also provides a specific application example of the core pore compression coefficient measuring method realized by the core pore compression coefficient measuring device, which specifically comprises the following contents:
in the first step, the core sample is put into the core holder 60, the second valve 602 is opened, the confining pressure is applied to the core sample in the core holder 60 by the plunger metering pump 10, the applied confining pressure is generally about 10MPa, the monitoring is performed by the first pressure sensor 30, and then the second valve 602 is closed.
In the second step, the third valve 603 on the inlet of the core holder 60 and the first valve 601 on the outlet are opened, the stratum water in the intermediate container 20 is driven by the plunger metering pump 10, the stratum water in the intermediate container 20 is used for displacing the core sample until the stratum water can continuously flow out of the outlet of the core holder 60, the first valve 601 on the outlet is closed, the pressurization of the core sample in the core holder 60 is continuously carried out by the plunger metering pump 10, the saturation is realized, the initial saturation pressure is obtained and is generally lower than the initial confining pressure by 5MPa, the initial saturation pressure is monitored by the second pressure sensor 40, and then the third valve 603 on the inlet is closed.
Third, the second valve 602 on the core holder 60 is opened, the plunger metering pump 10 is used to apply confining pressure to the core sample in the core holder 60 according to the set confining pressure values P1, P2, P3, … and Pn which are gradually increased, in the confining pressure applying process, the pore pressure P is changed due to the compression of the pore on the core sample, and when the pore pressure is increased to 1 confining pressure Pi, the pore pressure stabilizing value Pi is recorded after the pore pressure tends to be stable, then confining pressure is continuously applied, and the process is repeated until the test of the specified pressure point is completed, and the experiment is ended. Wherein a graph of confining pressure and pore pressure is made based on changes in specific confining pressure and pore pressure.
And fourthly, calculating the compression coefficient of the core pore under different conditions according to a calculation formula of the compression coefficient of the core pore, and drawing a curve of the compression coefficient of the pore and effective stress for calculating relevant parameters in reservoir development design.
As can be seen from the above description, the device and the method for measuring the core pore compression coefficient according to the embodiments of the present invention do not need to measure the outflow amount of fluid when the core pore compression coefficient is measured, only need to measure the pressure change, and improve the measurement accuracy of the core pore compression coefficient; the device has the advantages of few experimental equipment, no special experimental equipment, simple operation, low cost and rapidness, greatly improves the precision of the compression coefficient of the reservoir pore, is suitable for measuring the compression coefficient of the reservoir pore on site and in large batches, and provides basic data for the design of the oil and gas reservoir development scheme.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments. In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and to simplify the description, and are not indicative or implying that the apparatus or elements in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, numerous specific details are set forth. It may be evident, however, that the embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting the intention: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and/or permutation of these aspects and/or embodiments. Moreover, each aspect and/or embodiment of the invention may be used alone or in combination with one or more other aspects and/or embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (10)
1. A core pore compression coefficient measuring device, comprising: the device comprises a plunger metering pump, an intermediate container, a first pressure sensor, a second pressure sensor, a processing device and a core holder;
the first air valve of the plunger metering pump is connected with the confining pressure inlet of the core holder through a pipeline, and the second air valve of the plunger metering pump is connected with the inlet of the intermediate container through a pipeline; the outlet of the middle container is connected with the inlet of the core holder through a pipeline;
the first pressure sensor is arranged on a pipeline between the plunger metering pump and the core holder, and the second pressure sensor is arranged on a pipeline between the intermediate container and the core holder;
the middle container stores stratum water, the first pressure sensor and the second pressure sensor send collected data to the processing device, and the processing device is used for calculating a core pore compression coefficient according to the received data; the received data includes: confining pressure applied to the core sample and each axial pressure corresponding to each confining pressure;
the processing device is specifically used for:
according to each confining pressure and each axial pressure, the compression coefficient of each core pore under different pressure conditions is calculated by adopting the following formula:
wherein, according to the law of volume expansion and compression, the confining pressure P i-1 Pore pressure p i-1 To confining pressure P i And pore pressure p i At the time, the core pore compression volume V 1 And water body compression volume V 2 The following are provided:
V 1 ＝V p C f ((P i -p i )-(P i-1 -p i-1 ))；
V 2 ＝V p C w (p i -p i-1 )；
wherein V is p The pore volume of the core is the unit mL in the standard state; c (C) f Is the core pore compression coefficient; c (C) w Is the compression coefficient of water, and takes the value of 4 multiplied by 10 -4 /MPa；
According to the law of constant volume, the compression volume of the core pore is equal to the compression volume of the water body, namely:
V p C f ((P i -p i )-(P i-1 -p i-1 ))＝V p C w (p i -p i-1 )；
namely:
2. the core void compression factor measurement device according to claim 1, wherein a first valve is installed on the conduit of the outlet of the core holder.
3. The core void compression factor measurement device as recited in claim 1, wherein a second valve is mounted on the conduit between the plunger metering pump and the first pressure sensor.
4. The core void compression factor measurement device according to claim 1, wherein a third valve is installed on the conduit between the intermediate container and the second pressure sensor.
5. A method for measuring the core pore compression coefficient, which is based on the device for measuring the core pore compression coefficient according to any one of claims 1 to 4 and comprises the following steps:
placing a core sample into a core holder, applying confining pressure to the core sample through a confining pressure inlet of the core holder, and closing the confining pressure inlet of the core holder after the confining pressure reaches a first preset pressure value;
injecting formation water from an inlet of the core holder and displacing the core sample until the formation water continuously flows out from an outlet of the core holder;
injecting formation water from an inlet of the core holder and closing an outlet of the core holder until the axial pressure of the core sample reaches a second preset pressure value, and closing the inlet of the core holder;
opening a confining pressure inlet of the core holder and changing confining pressure applied to a core sample by a preset step length;
and determining each axial pressure corresponding to each confining pressure, and calculating each compression coefficient according to each confining pressure and each axial pressure.
6. The method of claim 5, wherein placing the core sample in the core holder and applying confining pressure to the core sample through a confining pressure inlet of the core holder comprises:
the core sample is placed in the core holder and confining pressure is applied to the core sample by the plunger metering pump through a confining pressure inlet of the core holder.
7. The method of claim 5, wherein injecting formation water from the inlet of the core holder and displacing the core sample until formation water continuously flows out of the outlet of the core holder comprises:
and applying internal pressure to the intermediate container for storing the formation water by using a plunger metering pump, so that the formation water in the intermediate container is injected from the inlet of the core holder and displaces the core sample until the formation water continuously flows out from the outlet of the core holder.
8. The method of claim 5, wherein opening the confining pressure inlet of the core holder and varying the confining pressure applied to the core sample in a predetermined step size comprises:
opening the confining pressure inlet of the core holder and increasing confining pressure applied to the core sample by a preset step.
9. The method for measuring the pore compressibility of a core according to claim 5, wherein the confining pressure and the axial pressure applied to the core sample are measured by a pressure sensor.
10. The method of claim 5, wherein the first predetermined pressure value is greater than the second predetermined pressure value.
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