CN104914230A - Experiment method and device for calculating rock core initial charging pressure - Google Patents
Experiment method and device for calculating rock core initial charging pressure Download PDFInfo
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- CN104914230A CN104914230A CN201510254140.6A CN201510254140A CN104914230A CN 104914230 A CN104914230 A CN 104914230A CN 201510254140 A CN201510254140 A CN 201510254140A CN 104914230 A CN104914230 A CN 104914230A
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Abstract
The invention provides an experiment method for calculating rock core initial charging pressure. The experiment method comprises selecting a rock core, pre-treating the rock core so that a water content state of the rock core is the same to that of a reservoir stratum of a stratum to be exploited, putting the rock core into a rock core clamping device, applying confining pressure for the rock core by a first inlet end of the rock core clamping device, wherein the confining pressure is the same to overburden pressure on the rock core in a stratum state of a stratum to be exploited, increasing pressure based on preset reference pressure according to a preset rule to obtain current charging pressure, feeding gas into the rock core under the current charging pressure by a high-pressure gas source until gas and water in the rock core are in a balanced state, measuring pressure at the outlet end, and when the pressure at the outlet end is the same to the pressure at a second inlet end, acquiring initial discharging pressure according to the pressure at the outlet end, wherein the initial discharging pressure is rock core displacement pressure. The experiment method is a gas reservoir reserve prediction experiment method for accurate prediction of gas reservoir reserve.
Description
Technical field
The present invention relates to oil and gas exploitation field, particularly relate to a kind of experimental technique and the device that calculate the initial filled pressure of rock core.
Background technology
Rock gas is the valuable energy and industrial chemicals, plays an important role in national economy, is usually described as the blood of industry by people.But rock gas buries in underground, usually find through exploratory development and exploit on ground and just can be utilized.Underground can be found to have accumulated the gas reservoir of rock gas by exploratory development, thus can develop and utilize this gas reservoir.
Gas reservoir is not isolated existence, connects each other, usually have oil-gas generation and the same or analogous several hydrocarbon-bearing pool of oil accumulation condition to coexist between inevitable and oil-degrading bacteria, reservoir, cap rock three.Oil-degrading bacteria is the stratum that can produce rock gas.The stratum of natural gas-storing can be called reservoir.Tightly be covered with reservoir, stop the stratum of oil-gas escape to be called cap rock.After oil gas is generated by oil-degrading bacteria, only have and discharge timely, gather together formation gas reservoir, just can become utilizable resource.Rock gas is moved after generating under the effect of various natural factor, migrates from oil-degrading bacteria to reservoir, is called the migration of natural gas from a reservoir to the migration of another reservoir.One of result of gas migration makes the oil gas of dispersion get up to form gas reservoir in the appropriate location enrichment of reservoir.And Gas Accumulation process can be divided into 3 stages: the first, in the energy accumulation stage, namely fill early stage.The process that oil-gas migration enters trap is called hydrocarbon charge.Trap refers to stop oil gas to continue migration, is suitable for the place of oil-gas accumulation.Trap is made up of reservoir, cap rock and shelter three fundamentals.This filled preliminary stage is the starting stage of steam injection, and rock gas now cannot in the hole of reservoir, only have when injection rate IR acquires a certain degree, and filling energy runs up to that to be enough to break through capillary resistance effect be that rock gas just starts to fill.The second, become to hide the filled main stage, namely fill the phase.In this stage, because the bulging force row of gas drives the effect of pore water, rock gas in the hole of reservoir on move, and intrapore local water is discharged.Final natural gas storing is in reservoir.3rd, the stage preserved by gas reservoir, namely fills the later stage.The rock gas of free phase directly from apopore ejection, but does not go out, and finally makes whole reservoir form stable gas accumulation.
The Filling process of research gas reservoir, thus provide according to being a kind of method that gas reservoir exploration is developed for finding gas reservoir.The method can obtain the initial filled pressure of the reservoir in certain class stratum, by by actual to this initial filled pressure and stratum gas reservoir become to hide time initial formation pressure compared with, thus can predict whether store rock gas in such stratum.
Although there is the theoretical method of the initial filled pressure of research reservoir in prior art, but these theoretical methods are mainly based on theoretic discussion, the various factors in Gas Accumulation and performance history is not comprehensively reproduced in this theoretic discussion, such as the different permeability of reservoir in Filling process and the rock core of water cut are integrated, therefore the initial filled pressure calculating reservoir truly can't reflect the Filling process of gas reservoir, accurate not enough compared with this and the initial filled pressure that uses the method for physics to reproduce Gas Accumulation and the process of exploitation and obtain.
Summary of the invention
The object of this invention is to provide a kind of experimental technique and device calculating the initial filled pressure of rock core of the initial filled pressure that accurately can calculate rock core.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize: a kind of experimental technique calculating the initial filled pressure of rock core, it comprises: choose rock core, and factor of porosity, the permeability of the factor of porosity of wherein said rock core, permeability and pore texture and the rock core of the reservoir on stratum to be developed are identical with pore texture; Pre-service is carried out to described rock core, to make the saturation state of described rock core identical with the saturation state of the reservoir on stratum to be developed; Described rock core is positioned in core holding unit, wherein said core holding unit has the first entrance point, the second entrance point and endpiece, described first entrance point can be used for adding confined pressure to described rock core, described second entrance point can be used for carrying out filled gas to described rock core, discharges the gas in described rock core when sealing described rock core when described endpiece can be used for filled and filled; By described first entrance point of described core holding unit, the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with described rock core is applied to described rock core; The basis of predetermined datum pressure after increasing according to pre-defined rule obtain current filled pressure; In described rock core, fill gas until air water reaches the state of balance in described rock core by high-pressure air source according to described current filled pressure, measure the pressure of described endpiece; When the pressure of described endpiece is identical with the pressure of described second entrance point, draw initial filled pressure according to the pressure of described endpiece, described initial filled pressure is the pressure that described rock core can carry out displacement.
Preferably, described method also comprises: when the pressure of described endpiece is different from the pressure of described second entrance point, repeats aforementionedly on the basis of predetermined datum pressure, obtain current filled pressure according to pre-defined rule and measure the step of described outlet pressures.
Preferably, described predetermined datum pressure is a definite value, and described pre-defined rule comprises a predetermined operation function, makes when the described front pressure that fills accumulates on described predetermined datum pressure basis at every turn.
Preferably, described predetermined datum pressure once fills the current filled pressure in process before being, described pre-defined rule is included in the force value that on described predetermined basis pressure-based, increase by is fixing.
Preferably, described predetermined datum pressure is the pressure from 0.
Preferably, described pre-service comprises: dry, find time and saturated local water; Described oven dry is rock core is placed in the baking oven of 100 °, constant temperature drying 8 hours; Describedly find time as rock core is placed in vacuum dryer, when vacuum tightness reaches 133.3Pa, find time 2 to 8 hours, to permeability lower than 1*10
-3μm
2sample, evacuated time needs 18 to 24 hours, then constant temperature drying 8 hours in an oven; Described saturated local water, for introduce in vacuum dryer by local water, is found time 1 hour, then soaks more than 4 hours at ambient pressure.
Preferably, described high-pressure air source is after using pressure generating equipment the pressure of gas to be increased to described current filled pressure, by pipe storage in high-pressure air source container.
Preferably, the state that in described rock core, air water reaches balance refers to the state that the pressure of described second entrance point and described endpiece remains unchanged.
Preferably, current filled pressure corresponding when described initial filled pressure is the pressure rising of described endpiece, when the pressure of described endpiece raises, described endpiece there are flowing out, and now described filled gas can enter the intrapore water of displacement rock core in rock core hole.
Preferably, it comprises: discharge the intrapore gas of described rock core; Calculate the gas saturation of described rock core.
Preferably, it comprises: the accumulative airshed calculating described rock core; Calculate the total accumulative airshed of described rock core; Calculate the accumulative airshed of described rock core and the ratio of total accumulative airshed.
Utilize the experimental provision of the experimental technique of the initial filled pressure of above-mentioned calculating rock core, it comprises: the core holding unit with the first entrance point, the second entrance point and endpiece, and described core holding unit is for holding rock core; Syringe pump, described syringe pump is connected with described first entrance point of described core holding unit, and described syringe pump has the first duty that can pressurize to described core holding unit and can maintain the second duty that described core holding unit is in predetermined pressure environment; High-pressure air source container, described high-pressure air source container is connected with described second entrance point of described core holding unit, and described high-pressure air source container has the 3rd duty that can fill the core holding unit of described core holding unit and the 4th duty that can stop filling described core holding unit; When described high-pressure air source container is in described 3rd duty, described syringe pump is in described second duty; Second pressure transducer, described second pressure transducer is connected with the endpiece of described core holding unit.
Provided by the inventionly a kind ofly calculate the initial experimental technique of filled pressure of rock core and the beneficial effect of device is:
First the present invention is by choosing rock core, the wherein factor of porosity of rock core, the factor of porosity of the rock core of the reservoir on permeability and pore texture and stratum to be developed, permeability is identical with pore texture, and pre-service is carried out to rock core, to make the saturation state of rock core identical with the saturation state of the reservoir on stratum to be developed, actual conditions to make this experiment can simulate the reservoir on stratum to be developed: rock core is identical with the saturation state of the reservoir on stratum to be developed, and the factor of porosity of rock core, the factor of porosity of the rock core of the reservoir on permeability and pore texture and stratum to be developed, permeability is identical with pore texture,
Then, this rock core is positioned in core holding unit, wherein core holding unit has the first entrance point, the second entrance point and endpiece, this first entrance point can be used for adding confined pressure to this rock core, this second entrance point can be used for carrying out filled gas to this rock core, discharges the gas in this rock core when sealing this rock core when this endpiece can be used for filled and filled; By the first entrance point of this core holding unit, the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with this rock core is applied to rock core; Which ensure that the pressure environment residing for rock core in energy real simulation stratum of the present invention;
Then, current filled pressure is obtained after the basis of predetermined datum pressure increasing according to pre-defined rule; In this rock core, fill gas until air water reaches the state of balance in this rock core by high-pressure air source according to this current filled pressure, measure the pressure of described endpiece thus the filled process of simulation Gas Accumulation;
Finally, when the pressure of endpiece is identical with the pressure of the second entrance point, draw initial filled pressure according to the pressure of this endpiece, this initial filled pressure is the pressure that rock core can carry out displacement; Thus the initial filled pressure of the different rock core of permeability in gas reservoir is obtained by real simulation Gas Accumulation process, thus accurately can calculate the initial filled pressure of rock core, thus achieve a kind of object calculating the experimental technique of the initial filled pressure of rock core that the present invention can provide the initial filled pressure that accurately can calculate rock core.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The process flow diagram of Fig. 1 embodiment of the present invention;
The process flow diagram of Fig. 2 embodiment of the present invention;
The process flow diagram of Fig. 3 embodiment of the present invention;
The structural representation of Fig. 4 embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the invention provides a kind of experimental technique calculating the initial filled pressure of rock core, it comprises: choose rock core, and factor of porosity, the permeability of the factor of porosity of wherein said rock core, permeability and pore texture and the rock core of the reservoir on stratum to be developed are identical with pore texture; Pre-service is carried out to described rock core, to make the saturation state of described rock core identical with the saturation state of the reservoir on stratum to be developed; Described rock core is positioned in core holding unit, wherein said core holding unit has the first entrance point, the second entrance point and endpiece, described first entrance point can be used for adding confined pressure to described rock core, described second entrance point can be used for carrying out filled gas to described rock core, discharges the gas in described rock core when sealing described rock core when described endpiece can be used for filled and filled; By described first entrance point of described core holding unit, the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with described rock core is applied to described rock core; The basis of predetermined datum pressure after increasing according to pre-defined rule obtain current filled pressure; In described rock core, fill gas until air water reaches the state of balance in described rock core by high-pressure air source according to described current filled pressure, measure the pressure of described endpiece; When the pressure of described endpiece is identical with the pressure of described second entrance point, draw initial filled pressure according to the pressure of described endpiece, described initial filled pressure is the pressure that described rock core can carry out displacement.
A kind of experimental technique calculating the initial filled pressure of rock core provided by the invention, first the present invention is by choosing rock core, the wherein factor of porosity of rock core, the factor of porosity of the rock core of the reservoir on permeability and pore texture and stratum to be developed, permeability is identical with pore texture, and pre-service is carried out to rock core, to make the saturation state of rock core identical with the saturation state of the reservoir on stratum to be developed, actual conditions to make this experiment can simulate the reservoir on stratum to be developed: rock core is identical with the saturation state of the reservoir on stratum to be developed, and the factor of porosity of rock core, the factor of porosity of the rock core of the reservoir on permeability and pore texture and stratum to be developed, permeability is identical with pore texture, then, this rock core is positioned in core holding unit, wherein core holding unit has the first entrance point, the second entrance point and endpiece, this first entrance point can be used for adding confined pressure to this rock core, this second entrance point can be used for carrying out filled gas to this rock core, discharges the gas in this rock core when sealing this rock core when this endpiece can be used for filled and filled, by the first entrance point of this core holding unit, the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with this rock core is applied to rock core, which ensure that the pressure environment residing for rock core in energy real simulation stratum of the present invention, then, current filled pressure is obtained after the basis of predetermined datum pressure increasing according to pre-defined rule, in this rock core, fill gas until air water reaches the state of balance in this rock core by high-pressure air source according to this current filled pressure, measure the pressure of described endpiece thus the filled process of simulation Gas Accumulation, finally, when the pressure of endpiece is identical with the pressure of the second entrance point, draw initial filled pressure according to the pressure of this endpiece, this initial filled pressure is the pressure that rock core can carry out displacement, thus the initial filled pressure of the different rock core of permeability in gas reservoir is obtained by real simulation Gas Accumulation process, thus accurately can calculate the initial filled pressure of rock core, thus achieve a kind of object calculating the experimental technique of the initial filled pressure of rock core that the present invention can provide the initial filled pressure that accurately can calculate rock core.
A kind of experimental provision calculating the initial filled pressure of rock core provided by the invention can be applied to natural gas pool.
As shown in Figure 4, S1: in the present embodiment, chooses rock core, and wherein the factor of porosity of the factor of porosity of this rock core, permeability and pore texture and the rock core of the reservoir on stratum to be developed, permeability are identical with pore texture.In the present embodiment, the rock core of predetermined quantity of purchasing, this predetermined number is identical with the classification number of the reservoir on stratum to be developed.In the present embodiment, choose 4 blocks of rock cores, i.e. the first rock core 25, second rock core 27, the 3rd rock core 29 and the 4th rock core 31, and these 4 rock cores are regular piston-shaped, diameter is 2.5cm, and length is 5cm.The factor of porosity of the rock core of this predetermined number, permeability and pore texture can represent the reservoir on stratum to be developed.
S2: pre-service is carried out to rock core, to make the saturation state of rock core identical with the saturation state of the reservoir on stratum to be developed, actual conditions to make this experiment can simulate the reservoir on stratum to be developed: rock core is identical with the saturation state of the reservoir on stratum to be developed, and the factor of porosity of the factor of porosity of rock core, permeability and pore texture and the rock core of the reservoir on stratum to be developed, permeability are identical with pore texture, therefore can situation in real simulation stratum to be developed.In the present embodiment, this pre-service is: dry, find time, saturated local water.
In the present embodiment, dry: baking oven rock core being placed in 100 DEG C, constant temperature drying 8 hours.
In the present embodiment, find time: rock core is placed in vacuum dryer, when vacuum tightness reaches 133.3Pa, find time 2 ~ 8 hours, to permeability lower than 1*10
-3μm
2sample, evacuated time need 18 ~ 24 hours.Constant temperature drying 8 hours in baking oven.
In the present embodiment, saturated local water: local water (in advance through filtering and evacuation processes) being introduced in vacuum dryer, continuing to find time 1 hour, soaking more than 4 hours at ambient pressure subsequently.
S3: in the present embodiment, this rock core is positioned in core holding unit, wherein this core holding unit has the first entrance point, the second entrance point and endpiece, this first entrance point can be used for adding confined pressure to this rock core, this second entrance point can be used for carrying out filled gas to this rock core, discharges the gas in this rock core when sealing this rock core when this endpiece can be used for filled and filled.
S4: in the present embodiment, applies the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with this rock core by this first entrance point of this core holding unit to this rock core; This pressure size is calculated by depth of stratum residing for rock sample, which ensure that the pressure environment residing for rock core in energy real simulation stratum of the present invention.In the present embodiment, this predetermined number is 4, so core holding unit is the first rock core 25 clamper 11, second rock core 27 clamper the 13, the 3rd rock core 29 clamper 15 and the 4th rock core 31 clamper 17.
As shown in Figure 4, in the present embodiment, the first rock core 25, second rock core 27, the 3rd rock core 29 and the 4th rock core 31 are respectively charged into the first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the 4th core holding unit 17.Second web member 63 has the second input end 71 and the second output terminal 77, and this second input end 71 is connected with syringe pump 50, and this second output terminal 77 is connected with the first entrance point 19 of the core holding unit of predetermined number.In the present embodiment, this second web member 63 has 5 fluid passages, and these 5 fluid passages connect high pressure syringe pump 50, first valve 33, second valve 35, the 3rd valve 37 and the 4th valve 39 respectively.Open the first valve 33, second valve 35, passage that the 3rd valve 37 is connected with syringe pump 50 with the 4th valve 39 and the second web member 63, make syringe pump 50 add confined pressure to the first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the 4th core holding unit 17 respectively by the fluid passage of the second web member 63.Adding confined pressure is adopt computer controlled automatic high pressure syringe pump 50 to realize supercharging by the water in compression core holding unit annular space or gas, for wrapping up the rock core in core holding unit, the water or the gas that add confined pressure can only contact with rubber sleeve, directly can not contact with core surface.This pressure size is calculated by depth of stratum residing for rock sample, and pressure size can control, and its value can not change with the change of rock core pore pressure.
S5: in the present embodiment, obtains current filled pressure after the basis of predetermined datum pressure increases according to pre-defined rule; In this rock core, fill gas until air water reaches the state of balance in this rock core by high-pressure air source according to this current filled pressure, measure the pressure of described endpiece; Thus the Filling process of simulated formation gas reservoir: namely rock gas is moved after being generated by oil-degrading bacteria under the effect of various natural factor, after the pressure of rock gas reaches the initial filled pressure of rock core, the water in the space that rock gas enters rock core thus in displacement rock core space.Because the initial filled pressure of the different rock core of permeability is different, namely when natural gas drive is for the rock core that permeability is different, the pressure of required rock gas is different, because it is easy that rock gas enters the rock core that the high rock core of permeability comparatively enters permeability low, so can show that the rock core of different permeability can carry out the pressure of displacement by the Filling process of simulated formation gas reservoir, i.e. the initial filled pressure of rock core.Thus realize a kind of object calculating the experimental technique of the initial filled pressure of rock core that the invention provides the initial filled pressure that accurately can calculate rock core.
In the present embodiment, when the pressure of described endpiece is different from the pressure of described second entrance point, repeat aforementionedly on the basis of predetermined datum pressure, obtain current filled pressure according to pre-defined rule and measure the step of described outlet pressures, thus by increasing current filled pressure step by step, and in this rock core, fill gas according to this current filled pressure by high-pressure air source until state that in this rock core, air water reaches balance and the pressure of measuring described endpiece realize using the current filled pressure increased step by step to fill gas in rock core, until when the pressure of the endpiece of core holding unit is identical with the pressure of the second entrance point, illustrate that filling gas enters in the hole of rock core, thus obtain the initial filled pressure of rock core.
In the present embodiment, this predetermined datum pressure is a definite value, and this pre-defined rule comprises a predetermined operation function, and current filled pressure is accumulated at every turn on this predetermined datum pressure basis.This predetermined operation function is equal difference increasing function, tolerance is positive number, in the present embodiment, this tolerance can not be too large, thus the amplitude that current filled pressure is accumulated at every turn on predetermined datum pressure basis is not too large, thus can realize finding initial filled pressure from this current filled pressure.In the present embodiment, this predetermined datum pressure is the pressure from 0.
In the present embodiment, this predetermined datum pressure once fills the current filled pressure in process before being, this pre-defined rule is included in the force value that on this predetermined basis pressure-based, increase by is fixing.Thus when the pressure of endpiece is different from the pressure of the second entrance point, with this current filled pressure as predetermined datum pressure, repeat aforementionedly on the basis of predetermined datum pressure, obtain current filled pressure according to pre-defined rule and measure the step of described outlet pressures.Namely predetermined datum pressure is a series of value, starting point is 0, then on the basis of 0, a fixing force value is increased according to pre-defined rule, obtain current filled pressure, then in this rock core, gas is filled until after air water reaches the state of balance in this rock core by high-pressure air source according to this current filled pressure, using this current filled pressure as the predetermined datum pressure filled next time, increase according to pre-defined rule according on the basis of predetermined datum pressure again, obtain current filled pressure and then in this rock core, fill gas until the mode that in this rock core, air water reaches the state of balance fills again by high-pressure air source according to this current filled pressure, until the pressure of endpiece is identical with the pressure of the second entrance point, stop filling.In the present embodiment, this fixed value is positive number, such as 1Pa.This current filled pressure is the force value between 0 to initial formation pressure.Thus when by high-pressure air source, according to this, current filled pressure fills gas in this rock core, filled gas can be carried out according to the mode progressively increasing current filled pressure, thus the filled pressure of the intrapore water of energy displacement rock core can be drawn from these current filled pressure.
As shown in Figure 4, in the present embodiment, first web member 61 has first input end 69 and the first output terminal 75, and this first input end 69 is connected with high-pressure air source container 67, and this first output terminal 75 is connected with the second entrance point 21 of the core holding unit of described predetermined number.In the present embodiment, this first web member 61 has 5 fluid passages, and these 5 fluid passages connect high-pressure air source container 67, first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 and the 4th intermediate receptacle 87 respectively.The 14 valve 59 is connected between this high-pressure air source container 67 with the first web member 61.This first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 are connected the 5th valve 41, the 6th valve 43, the 7th valve 45 and the 8th valve 47 respectively with the 4th intermediate receptacle 87.Before carrying out filled gas to each rock core, close the 14 valve 59, to make high-pressure air source container 67 and each rock core disconnect, high-pressure air source container 67 and rock core are all in the pressure system of each self-equilibrating.Then after using pressure generating equipment that the pressure of gas is increased to current filled pressure, by pipe storage in high-pressure air source container 67.In the present embodiment, the withstand voltage 70MPa of this high-pressure air source container 67.In the present embodiment, this pressure generating equipment is supercharger, and this gas filled is dry air or nitrogen.
As shown in Figure 4, in the present embodiment, close the 9th valve 49, the tenth valve the 51, the 11 valve the 53 and the 12 valve 55, to make the first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the 4th core holding unit 17 outwardly can not discharge gas by endpiece 23, the gas from entrance point can only be accepted.Open the 5th valve 41, the 6th valve 43, the 7th valve 45 and the 8th valve the 47 and the 14 valve 59, communicate with high-pressure air source container 67 to make the first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 and the 4th intermediate receptacle 87; Second entrance point 21 of the first rock core 25, second rock core 27, the 3rd rock core 29 and the 4th rock core 31 communicates with the first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 and the 4th intermediate receptacle 87 respectively, gas in high-pressure air source container 67 can pass through pipeline, under certain differential pressure action, flow to each rock core, water in displacement rock core, the Filling process of simulation gas reservoir.And in this filled process, first core holding unit 11, second core holding unit 13, 3rd core holding unit 15 is connected with the first input end 69 of the first web member 61 with the first entrance point 19 of the 4th core holding unit 17, and the first input end 69 of the first web member 61 is connected with syringe pump 50, now, syringe pump 50 is in the second duty that the core holding unit maintaining predetermined number is in predetermined pressure environment, thus achieve the present invention in the filled process of simulation Gas Accumulation, pressure state described in each rock core is identical with the pressure state residing for reservoir in stratum, thus the object of real simulation Gas Accumulation process can be realized.In this filled process, fill the water in the gas rock core that displacement permeability is high under current filled pressure, enter in the high rock core of permeability.In the present embodiment, experimental period, each rock core entrance end pressure is recorded.In the present embodiment, when in each rock core, air water reaches equilibrium state, when namely the pressure of each rock core entrance end no longer changes, stop filling.
As shown in Figure 1, in the present embodiment, new current filled pressure is obtained after the basis of current filled pressure increasing according to pre-defined rule; In this rock core, fill gas until air water reaches the state of balance in this rock core by high-pressure air source according to this new current filled pressure, measure the pressure of described endpiece, until when the pressure of endpiece is identical with the pressure of this second entrance point, stop filling.
S6: in the present embodiment, when the pressure of endpiece is identical with the pressure of this second entrance point, draws initial filled pressure according to the pressure of this endpiece, and this initial filled pressure is the pressure that this rock core can carry out displacement.Filled gas is carried out in the above-mentioned mode according to progressively increasing current filled pressure, in the process of simulation Gas Accumulation, when the pressure of endpiece 23 raises, this endpiece 23 there are flowing out, now fill gas and can enter the intrapore water of displacement rock core in rock core hole, thus make the pressure of endpiece 23 equal with the pressure of the second entrance point 21, thus the initial filled pressure of rock core can be drawn according to the pressure of this endpiece 23.
S7: as shown in Figure 2, in the present embodiment, the intrapore gas of release rock core, thus the exploitation of simulation gas well.
As shown in Figure 4, in the present embodiment, open the 9th valve 49, the tenth valve the 51, the 11 valve the 53 and the 12 valve 55, the gas stored by each rock core is discharged with certain airshed from each outlet port of rock core holder 23.In the present embodiment, when gas to the airshed of release rock core is zero, experiment terminates.
S8: the gas saturation calculating described rock core.
In the present embodiment, this gas saturation can pass through following formulae discovery:
Gas saturation=1-water saturation;
The factor of porosity of the water cut/rock core after water saturation=each rock core has discharged; Water cut after each rock core has discharged can be measured by nuclear magnetic resonance method, also can be calculated by additive method, such as: subtracted each other by the weight of rock core after the weight of the rock core after pre-service but before unaerated and release gas being completed and draw.
S9: as shown in Figure 3, in the present embodiment, calculates the accumulative airshed of described rock core;
As shown in Figure 4, in the present embodiment, 3rd web member 65 has the 3rd input end 73 and the 3rd output terminal the 79, three input end 73 is connected with the endpiece 23 of the core holding unit of predetermined number, and the 3rd output terminal 79 is connected with mass-flow gas meter 93.In the present embodiment, the 3rd web member 65 has 5 fluid passages, and these 5 fluid passages are connected with the 13 valve 57 with the 9th valve 49, the tenth valve the 51, the 11 valve the 53, the 12 valve 55 respectively.13 valve 57 is connected with mass-flow gas meter 93, thus rock core is when the gas stored by discharging, and the gas that each rock core discharges is by this mass-flow gas meter 93.When the accumulative airshed of the first rock core 25 in calculating first core holding unit 11, the 9th valve 49 be connected with the endpiece 23 of the first rock core 25 clamper 11 can be opened, thus make gas that the first rock core 25 in the first core holding unit 11 discharges by mass-flow gas meter 93, thus obtain the accumulative airshed of the first rock core 25 in the first core holding unit 11.When the accumulative airshed of the second rock core 27 in calculating second rock core 27 clamper 13, the tenth valve 51 be connected with the endpiece 23 of the second core holding unit 13 can be opened, thus make gas that the second rock core 27 in the second core holding unit 13 discharges by mass-flow gas meter 93, thus obtain the accumulative airshed of the second rock core 27 in the second core holding unit 13.When the accumulative airshed of the 3rd rock core 29 in calculating the 3rd core holding unit 15, the 11 valve 53 be connected with the endpiece 23 of the 3rd core holding unit 15 can be opened, thus make gas that the 3rd rock core 29 in the 3rd core holding unit 15 discharges by mass-flow gas meter 93, thus obtain the accumulative airshed of the 3rd rock core 29 in the 3rd core holding unit 15.When the accumulative airshed of the 4th rock core 31 in calculating the 4th core holding unit 17, the 12 valve 55 be connected with the endpiece 23 of the 4th core holding unit 17 can be opened, thus make gas that the 4th rock core 31 in the 4th core holding unit 17 discharges by mass-flow gas meter 93, thus obtain the accumulative airshed of the 4th rock core 31 in the 4th core holding unit 17.
S10: in the present embodiment, calculates the total accumulative airshed of described rock core;
As shown in Figure 4, in the present embodiment, total accumulative airshed refers to total airshed of each rock core endpiece 23.The total accumulative airshed of rock core can be measured from this mass-flow gas meter 93.
S11: in the present embodiment, calculates the accumulative airshed of described rock core and the ratio of total accumulative airshed, thus can according to all kinds of reservoir of described ratio in judgement to the contribution of rate-maintenance capability.This all kinds of reservoir contribution to rate-maintenance capability refers to that accumulative airshed is larger with the ratio of total accumulative airshed, and the contribution of such reservoir to rate-maintenance capability is larger.
As shown in table 1, list the initial filled pressure of 4 blocks of different rock cores of permeability and different permeability reservoir to the contribution of stable production period.
Table 1
As shown in Figure 4, in the present embodiment, the core holding unit of predetermined number, this core holding unit has the first entrance point 19, second entrance point 21 and endpiece 23, and this core holding unit is for holding rock core.This predetermined number is identical with the classification number of the reservoir on stratum to be developed, thus make the core holding unit of this predetermined number can accommodate the different rock core of the permeability of the reservoir on stratum to be developed respectively, thus the Gas Accumulation process that the present invention is simulated truly can reflect the Gas Accumulation process on stratum to be developed.This core holding unit can be high pressure resistant, and the top pressure that can bear is 70MPa.In the present embodiment, this predetermined number is 4, so core holding unit is the first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the 4th core holding unit 17.This first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the first entrance point 19 of the 4th core holding unit 17 are connected the first valve 33, second valve 35, the 3rd valve 37 and the 4th valve 39 respectively; This first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 are connected the 5th valve 41, the 6th valve 43, the 7th valve 45 and the 8th valve 47 respectively with the second entrance point 21 of the 4th core holding unit 17; This first core holding unit 11, second core holding unit 13, the 3rd core holding unit 15 and the endpiece 23 of the 4th core holding unit 17 are connected the 9th valve 49, the tenth valve the 51, the 11 valve the 53 and the 12 valve 55 respectively.
As shown in Figure 1, in the present embodiment, syringe pump 50, this syringe pump 50 is connected with the first entrance point 19 of the core holding unit of predetermined number, carries out supercharging to make this syringe pump 50 by this first entrance point 19 to the core holding unit of this predetermined number.In the present embodiment, the second web member 63 has the second input end 71 and the second output terminal 77, and this second input end 71 is connected with syringe pump 50, and this second output terminal 77 is connected with the first entrance point 19 of the core holding unit of predetermined number.In the present embodiment, the second web member 63 has 5 fluid passages, and these 5 fluid passages connect high pressure syringe pump 50, first valve 33, second valve 35, the 3rd valve 37 and the 4th valve 39 respectively.In the present embodiment, connecting pipeline used is high pressure resistant hollow pipeline.This syringe pump 50 has the second duty that the first duty can pressurizeed to the core holding unit of predetermined number and the core holding unit that can maintain this predetermined number are in predetermined pressure environment.When using the present invention to simulate gas reservoir Filling process, the core holding unit of this syringe pump 50 pairs of predetermined number is used to pressurize, the overburden pressure that this pressure size and rock core bear under the formation conditions on stratum to be developed is identical, which ensure that the pressure environment residing for rock core in energy real simulation stratum of the present invention, this predetermined pressure environment refers to the overburden pressure environment that rock core bears under the formation conditions on stratum to be developed.In the present embodiment, this syringe pump 50 is high pressure syringe pump 50, and maximum pressure is 70MPa.
As shown in Figure 1, in the present embodiment, high-pressure air source container 67, this high-pressure air source container 67 is connected with the second entrance point 21 of the core holding unit of predetermined number, carries out filled gas to make this high-pressure air source container 67 by this second entrance point 21 pairs of core holding units.In the present embodiment, use after the pressure of gas is increased to filled pressure by pressure generating equipment, then by pipe storage in high-pressure air source container 67.The withstand voltage 70MPa of this high-pressure air source container 67.In the present embodiment, this pressure generating equipment is supercharger, and this gas filled is dry air or nitrogen.This high-pressure air source container 67 has the 3rd duty that can fill the core holding unit of predetermined number and the 4th duty that can stop filling the core holding unit of predetermined number.
As shown in Figure 1, in the present embodiment, first web member 61 has first input end 69 and the first output terminal 75, and this first input end 69 is connected with high-pressure air source container 67, and this first output terminal 75 is connected with the second entrance point 21 of the core holding unit of predetermined number.The middle core holding unit of predetermined number, middle core holding unit one end of this predetermined number is connected with the first output terminal 75 of this first web member 61, and the other end is connected respectively at the second entrance point 21 of the core holding unit of predetermined number.In the present embodiment, the first web member 61 has 5 fluid passages, and these 5 fluid passages connect high-pressure air source container 67, first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 and the 4th intermediate receptacle 87 respectively.The 14 valve 59 is connected between this high-pressure air source container 67 with the first web member 61.This first intermediate receptacle 81, second intermediate receptacle 83, the 3rd intermediate receptacle 85 are connected the 5th valve 41, the 6th valve 43, the 7th valve 45 and the 8th valve 47 respectively with the 4th intermediate receptacle 87.This high-pressure air source container 67 filled to the rock core that permeability is different by the first web member 61 simultaneously, thus the real simulation Filling process of stratum gas reservoir.When described high-pressure air source container 67 is in described 3rd duty, this syringe pump 50 is in described second duty.When using the present invention to simulate gas reservoir Filling process, this high-pressure air source container 67 is used to carry out filled gases at high pressure by the second entrance point 21 pairs of core holding units of core holding unit, thus make in this filled process, syringe pump 50 is in the second duty of predetermined pressure environment by the core holding unit that the first entrance point 19 of core holding unit maintains this predetermined number, thus can the Filling process of real simulation stratum gas reservoir.
As shown in Figure 1, in the present embodiment, the first pressure transducer 89 of predetermined number, the first pressure transducer 89 of this predetermined number is connected between the second entrance point 21 of the core holding unit of this predetermined number and high-pressure air source container 67.In the present embodiment, this predetermined number is four, so this first pressure transducer 89 is 4.These 4 the first pressure transducers 89 all have first end and the second end, the first end of these 4 the first pressure transducers 89 is connected with the 8th valve 47 with the 5th valve 41, the 6th valve 43, the 7th valve 45 respectively, and the second end of these 4 the first pressure transducers 89 respectively the first rock core 25 clamper 11, second rock core 27 clamper the 13, the 3rd rock core 29 clamper 15 is connected with the second entrance point 21 of the 4th rock core 31 clamper 17.This first pressure transducer 89 is for measuring the pressure of second entrance point 21 of this first rock core 25 clamper 11, second rock core 27 clamper the 13, the 3rd rock core 29 clamper 15 and the 4th rock core 31 clamper 17.
As shown in Figure 1, in the present embodiment, the second pressure transducer 91 of predetermined number, the second pressure transducer 91 of this predetermined number is connected with the endpiece 23 of the core holding unit of predetermined number respectively.In the present embodiment, this predetermined number is four, so this second pressure transducer 91 is 4.These 4 the second pressure transducers 91 all have the 3rd end and the 4th end, 3rd end of these 4 the second pressure transducers 91 is connected with the 12 valve 55 with the 9th valve 49, the tenth valve the 51, the 11 valve 53 respectively, to make these 4 the second pressure transducers 91 for measuring the pressure of the endpiece 23 of this first rock core 25 clamper 11, second rock core 27 clamper the 13, the 3rd rock core 29 clamper 15 and the 4th rock core 31 clamper 17.
As shown in Figure 1, in the present embodiment, mass-flow gas meter 93, this mass-flow gas meter 93 is connected with the endpiece 23 of the core holding unit of predetermined number.In the present embodiment, the 3rd web member 65 has the 3rd input end 73 and the 3rd output terminal the 79, three input end 73 is connected with the endpiece 23 of the core holding unit of predetermined number, and the 3rd output terminal 79 is connected with mass-flow gas meter 93.3rd web member 65 has 5 fluid passages, and these 5 fluid passages are connected with the 13 valve 57 with the 9th valve 49, the tenth valve the 51, the 11 valve the 53, the 12 valve 55 respectively.13 valve 57 is connected with mass-flow gas meter 93, thus rock core is when the gas stored by discharging, the gas that each rock core discharges is by this mass-flow gas meter 93, thus this mass-flow gas meter 93 can measure the total accumulative airshed of rock core.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various change or modification to the embodiment of the present invention according to content disclosed in application documents and not depart from the spirit and scope of the present invention.
Claims (12)
1. calculate an experimental technique for the initial filled pressure of rock core, it is characterized in that, it comprises:
Choose rock core, factor of porosity, the permeability of the factor of porosity of wherein said rock core, permeability and pore texture and the rock core of the reservoir on stratum to be developed are identical with pore texture;
Pre-service is carried out to described rock core, to make the saturation state of described rock core identical with the saturation state of the reservoir on stratum to be developed;
Described rock core is positioned in core holding unit, wherein said core holding unit has the first entrance point, the second entrance point and endpiece, described first entrance point can be used for adding confined pressure to described rock core, described second entrance point can be used for carrying out filled gas to described rock core, discharges the gas in described rock core when sealing described rock core when described endpiece can be used for filled and filled;
By described first entrance point of described core holding unit, the identical confined pressure of overburden pressure that size bears under the formation conditions on stratum to be developed with described rock core is applied to described rock core;
The basis of predetermined datum pressure after increasing according to pre-defined rule obtain current filled pressure;
In described rock core, fill gas until air water reaches the state of balance in described rock core by high-pressure air source according to described current filled pressure, measure the pressure of described endpiece;
When the pressure of described endpiece is identical with the pressure of described second entrance point, draw initial filled pressure according to the pressure of described endpiece, described initial filled pressure is the pressure that described rock core can carry out displacement.
2. the experimental technique of the initial filled pressure of calculating rock core according to claim 1, it is characterized in that, described method also comprises: when the pressure of described endpiece is different from the pressure of described second entrance point, repeats aforementionedly on the basis of predetermined datum pressure, obtain current filled pressure according to pre-defined rule and measure the step of described outlet pressures.
3. the experimental technique of the initial filled pressure of calculating rock core according to claim 2, it is characterized in that: described predetermined datum pressure is a definite value, described pre-defined rule comprises a predetermined operation function, makes when the described front pressure that fills accumulates on described predetermined datum pressure basis at every turn.
4. the experimental technique of the initial filled pressure of calculating rock core according to claim 3, it is characterized in that: described predetermined datum pressure once fills the current filled pressure in process before being, described pre-defined rule is included in the force value that on described predetermined basis pressure-based, increase by is fixing.
5. the experimental technique of the initial filled pressure of calculating rock core according to claim 4, is characterized in that: described predetermined datum pressure is the pressure from 0.
6. the experimental technique of the initial filled pressure of calculating rock core according to claim 5, is characterized in that: described pre-service comprises: dry, find time and saturated local water; Described oven dry is rock core is placed in the baking oven of 100 °, constant temperature drying 8 hours; Describedly find time as rock core is placed in vacuum dryer, when vacuum tightness reaches 133.3Pa, find time 2 to 8 hours, to permeability lower than 1*10
-3μm
2sample, evacuated time needs 18 to 24 hours, then constant temperature drying 8 hours in an oven; Described saturated local water, for introduce in vacuum dryer by local water, is found time 1 hour, then soaks more than 4 hours at ambient pressure.
7. the experimental technique of the initial filled pressure of calculating rock core according to claim 6, is characterized in that: described high-pressure air source is after using pressure generating equipment the pressure of gas to be increased to described current filled pressure, by pipe storage in high-pressure air source container.
8. the experimental technique of the initial filled pressure of calculating rock core according to claim 7, is characterized in that: the state that in described rock core, air water reaches balance refers to the state that the pressure of described second entrance point and described endpiece remains unchanged.
9. the experimental technique of the initial filled pressure of calculating rock core according to claim 8, it is characterized in that: current filled pressure corresponding when described initial filled pressure is the pressure rising of described endpiece, when the pressure of described endpiece raises, described endpiece there are flowing out, and now described filled gas can enter the intrapore water of displacement rock core in rock core hole.
10. the experimental technique of the initial filled pressure of calculating rock core according to claim 9, it is characterized in that, it comprises:
Discharge the intrapore gas of described rock core;
Calculate the gas saturation of described rock core.
The experimental technique of the initial filled pressure of 11. calculating rock core according to claim 10, it is characterized in that, it comprises:
Calculate the accumulative airshed of described rock core;
Calculate the total accumulative airshed of described rock core;
Calculate the accumulative airshed of described rock core and the ratio of total accumulative airshed.
12. experimental provisions utilizing the experimental technique of the initial filled pressure of the calculating rock core in claim 1 to 11 described in arbitrary claim, it is characterized in that, it comprises:
Have the core holding unit of the first entrance point, the second entrance point and endpiece, described core holding unit is for holding rock core;
Syringe pump, described syringe pump is connected with described first entrance point of described core holding unit, and described syringe pump has the first duty that can pressurize to described core holding unit and can maintain the second duty that described core holding unit is in predetermined pressure environment;
High-pressure air source container, described high-pressure air source container is connected with described second entrance point of described core holding unit, and described high-pressure air source container has the 3rd duty that can fill the core holding unit of described core holding unit and the 4th duty that can stop filling described core holding unit; When described high-pressure air source container is in described 3rd duty, described syringe pump is in described second duty;
Second pressure transducer, described second pressure transducer is connected with the endpiece of described core holding unit.
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