CN104406878B - Method and apparatus for measuring solubility of carbon dioxide in crude oil and water - Google Patents

Abstract

The present invention provides a method and an apparatus for measuring the solubility of carbon dioxide in crude oil and water. The apparatus comprises a plunger pump, a first intermediate container, a second intermediate container, a third intermediate container, a camera, a PVT container, a separating bottle and a gas indication bottle, wherein the PVT container is connected with a pressure gauge, the PVT container is provided with a plunger and a visualization window, the plunger pump is communicated with the first intermediate container, the first intermediate container is communicated with the PVT container, the plunger pump is communicated with the second intermediate container, the second intermediate container is communicated with the PVT container, the plunger pump is communicated with the third intermediate container, the third intermediate container is communicated with the PVT container, the camera is arranged on the visualization window side of the PVT container, the separating bottle is communicated with the PVT container, and the separating bottle is communicated with the gas indication bottle. The method for measuring the solubility of carbon dioxide in crude oil and water is completed by using the apparatus. The method and the apparatus of the present invention are applicable for the measurement of the solubility of carbon dioxide in the depleted oil reservoir oil-water emulsification system in crude oil and water, the operation is simple, and the measurement result is accurate.

Description

A kind of method and apparatus of measurement carbon dioxide solubility in crude oil and water

Technical field

The present invention relates to a kind of method and apparatus of measurement carbon dioxide solubility in crude oil and water, particularly to one kind In exhaustion oil reservoir oil-water emulsion system, the carbon dioxide method of testing of solubility and device in crude oil and water, belong to oil recovery Technical field of measurement and test.

Background technology

With the fast development of global industry, co₂The discharge capacity of isothermal chamber gas significantly rises, and causes global climate to become Warm, cause a series of severe problems such as sea level rise.Therefore, the efficient emission-reducing method of greenhouse gases becomes World Focusing Focus.

Geological storage technology is considered as the approach of maximally effective solution greenhouse gas emission at no distant date, and it is main that it is buried Place includes oil-gas reservoir, the salt water bearing reservoir in deep, unworkable coal seam and deep-sea of exhaustion etc..Wherein, deep brine layer because It has the advantages such as distribution area is wide, thickness is big, storage volume is big and of great interest, but it is for co₂Follow Ring is using can not embody well.

The method that oil reservoir is buried then can solve the problem that above-mentioned deep brine layer is buried.With Some Domestic oil field Have been enter into the continuous expansion of middle and later periods of developing and gas drive technology at home and abroad live application scale, using exhaustion, discarded, high Aqueous oil reservoir buries co₂Co can not only be solved₂Emission problem can recycle co simultaneously₂Carry out the displacement of reservoir oil thus improving The recovery ratio of crude oil, realizes the doulbe-sides' victory of Social benefit and economic benefit.

The co of exhaustion oil reservoir₂Bury technology, solubility is to weigh a key parameter of its amount of burying, and how to obtain accurately , real co₂Solubility becomes this area and solves the key technical problem that oil reservoir is buried.

At present about co₂In crude oil and water, the method for testing of solubility mainly passes through oil-water separation two-phase, right respectively Oil phase and aqueous phase carry out flash distillation experiment thus obtaining co₂Solubility in oil phase and aqueous phase.The method is for conventional oil reservoir In co₂It is effective that solubility solves, but for exhaustion oil reservoir and inapplicable, and its reason is the profit in exhaustion oil reservoir Main presented in emulsion and be not readily separated.Due to, in mining site design and reservoir modeling, being required for reservoir condition Lower co₂The data of solubility is understanding co₂Co in oil displacement process₂Charge velocity and injection rate.Therefore, it is badly in need of a kind of exhaustion Co in oil reservoir oil-water emulsion system₂The method of testing of solubility in crude oil and water.

Content of the invention

In order to solve the above problems, it is an object of the invention to provide a kind of measurement carbon dioxide dissolves in crude oil and water The method and apparatus of degree, the method and device be applied to measurement exhaustion oil reservoir oil-water emulsion system carbon dioxide in crude oil and water In solubility, and simple to operate, test result is accurate.

In order to achieve the above object, present invention firstly provides a kind of measure carbon dioxide solubility in crude oil and water Device, this device include plunger displacement pump, the first intermediate receptacle, the second intermediate receptacle, the 3rd intermediate receptacle, video camera, pvt container, Separating bottle, gas instruction bottle；

Described pvt container is connected with pressure gauge, and described pvt container is provided with plunger and visual windows；

Described plunger displacement pump is connected with the first intermediate receptacle by the 5th valve, and described first intermediate receptacle passes through the first valve With described pvt reservoir；

Described plunger displacement pump is connected with the second intermediate receptacle by the 6th valve, and described second intermediate receptacle passes through the second valve With described pvt reservoir；

Described plunger displacement pump is connected with the 3rd intermediate receptacle by the 7th valve, and described 3rd intermediate receptacle passes through the 3rd valve With described pvt reservoir；

Described video camera is arranged on the visual windows side of described pvt container；

Described separating bottle passes through the 4th valve and described pvt reservoir；Described separating bottle is with described gas instruction bottle even Logical；Described gas instruction bottle is connected with gas gauge.

It is preferable that described separating bottle in measurement carbon dioxide device of solubility in crude oil and water that the present invention provides Lower end is provided with balance.

According to specific embodiments of the present invention it is preferable that described 5th valve is located under described first intermediate receptacle Side, described first valve is located at the top of described first intermediate receptacle.

According to specific embodiments of the present invention it is preferable that described 6th valve is located under described second intermediate receptacle Side, described second valve is located at the top of described second intermediate receptacle.

According to specific embodiments of the present invention it is preferable that described 7th valve is located under described 3rd intermediate receptacle Side, described 3rd valve is located at the top of described 3rd intermediate receptacle.

The present invention provide measurement carbon dioxide device of solubility in crude oil and water in it is preferable that with described plunger The pipeline of pump connection divides three to connect with the 5th valve, the 6th valve, the 7th valve respectively.

It is preferable that holding with described pvt in measurement carbon dioxide device of solubility in crude oil and water that the present invention provides The pipeline of device connection divides three to connect with the first valve, the second valve, the 3rd valve respectively.

According to specific embodiments of the present invention it is preferable that described 4th valve is located at the lower section of described pvt container.

Present invention also offers a kind of method of measurement carbon dioxide solubility in crude oil and water, the method is passed through above-mentioned Device is carried out, and the method comprises the following steps:

Step one: measurement separating bottle quality；

Step 2: to pvt container inject salt solution, crude oil so that the salinity of oil water mixture in pvt container reach pre- Definite value, wherein predetermined salinity determines according to test situation, then accounts for below oil water mixture 80mol% to the injection of pvt container Co₂Gas；

Step 3: it is -180 DEG C of room temperature that pvt container is heated to temperature, and is forced into 0-150mpa (preferably to pvt container Below 150mpa), at the stated pressure and temperature, calculate the density of described salt solution and the density of described crude oil；

Step 4: promote the plunger of pvt container, when no longer having bubble to produce in gas instruction bottle, record pvt container The numerical value change of plunger, and record the volume of gas gauge reading now and separating bottle；

Step 5: profit weigh with scale separating bottle and in it liquid quality；

Step 6: cleaning separating bottle is simultaneously dried, and measures its quality；

Repeat step one to step 6 it is ensured that the volume of two sub-samplings is different, and record the number of the plunger of pvt container Value changes, gas gauge reading, separating bottle reading, separating bottle and in it liquid quality；

Step 7: according to the data of above-mentioned record, calculate co₂Solubility in crude oil and water, completes co₂In crude oil and The measurement of solubility in water.

It is preferable that by following step in measurement carbon dioxide method of solubility in crude oil and water that the present invention provides Rapid calculating co₂Solubility s in crude oil_wAnd co₂Solubility s in water_o:

First, according to separating bottle quality m₀, the density p of salt solution_w, the density p of crude oil_o, separating bottle and in it liquid matter Amount m₁, repeat test in separating bottle quality m', repeat test in separating bottle and in it liquid quality m₂, the volume of separating bottle v₁, repeat test in separating bottle volume v₂, carry out solving equation group twice using equation group 1,2 and respectively obtain in two sub-samplings Oil and respective volume v of water in oil-water emulsion_o1、v_w1、v_o2、v_w2, unit is cm³；

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o1}+{\mathrm{\ρ}}_w{v}_{w1}=m_1-m_0\\ v_{o1}+v_{w1}=v_1\end{array}\right.---1$

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o2}+{\mathrm{\ρ}}_w{v}_{w2}=m_2-m^{\′}\\ v_{o2}+v_{w2}=v_2\end{array}\right.---2$

Then, acquired results are substituted into equation group 3, according to gas gauge reading v₁, repeat test in gas gauge reading v₂, ask Obtain gas-oil ratio r₀With gas-water ratio r_w；

$\left\{\begin{array}{c}{r}_0{v}_{o1}+r_w{v}_{w1}=v_1\\ r_0{v}_{o2}+r_w{v}_{w2}=v_2\end{array}\right.---3$

$\left\{\begin{array}{c}{s}_o=(p_0{v}_{\mathrm{og}}/{\mathrm{zrt}}_0)/[(p_0{v}_{\mathrm{og}}/{\mathrm{zrt}}_0)+(v_{o1}{\mathrm{\ρ}}_{\mathrm{oc}}/m_o)]\\ s_w=(p_0{v}_{\mathrm{wg}}/{\mathrm{zrt}}_0)/[(p_0{v}_{\mathrm{wg}}/{\mathrm{zrt}}_0)+(v_{w1}{\mathrm{\ρ}}_{\mathrm{wc}}/m_w)]\end{array}\right.---4$

Finally, according to normal temperature t₀, normal pressure p₀, obtain crude oil by acquired results and dissolve co₂Volume v_og, unit is cm³, And water dissolves co₂Volume v_wg, unit is cm³, and then the density p at normal temperatures and pressures by known crude oil and water_oc、ρ_wc With relative molecular mass m_o、m_wAnd formula 4, obtain co₂Solubility s in crude oil_wAnd co₂Solubility s in water_o, single Position is mol/mol

It is preferable that being taken the photograph using described in measurement carbon dioxide method of solubility in crude oil and water that the present invention provides Salt solution in pvt container described in camera record, crude oil and co₂The situation of change of the mixed system of three.

The apparatus and method of measurement carbon dioxide solubility in crude oil and water that the present invention provides can measure exhaustion oil Hide solubility in crude oil and water for the carbon dioxide in oil-water emulsion system.

The measurement device co of the measurement carbon dioxide solubility in crude oil and water being provided using the present invention₂In crude oil and water In solubility when, specifically include following steps:

1st, close all valves, using balance measurement separating bottle quality, be designated as m₀；

2nd, open the 3rd valve, the 7th valve, inject the salt solution of appropriate volume using plunger displacement pump for pvt container；

3rd, close the 3rd valve, the 7th valve, open the 5th valve, the first valve, injected for pvt container using plunger displacement pump , so that the oil water mixture in pvt container reaches predetermined salinity, wherein predetermined salinity is according to test for the crude oil of certain volume Situation determines；

4th, close the 5th valve, the first valve, open the second valve, the 6th valve, injected for pvt container using plunger displacement pump The co of appropriate volume₂, close the second valve, the 6th valve；

5th, heat pvt container, pressurizeed for pvt container by advancing the plunger of pvt container, pressure gauge observes pressure change extremely Pressure p, at pressure and temperature the density of salt solution be designated as ρ_w, the density of crude oil is designated as ρ_o, measure co under this temperature and pressure₂ Solubility in crude oil and water；

6th, it is sufficiently stirred for mixed system (salt solution, crude oil and the co in pvt container while pvt container pressurization₂Mixing System), observe the situation of change of mixed system in pvt container by video camera simultaneously；

7th, open the 4th valve, promote the plunger of pvt container, when no longer having bubble to produce in gas instruction bottle, record Plunger numerical value change (w₁-w₁'), and record gas gauge reading v now₁Volume v with separating bottle₁, close the 4th valve；

8th, with balance weighing apparatus measurement now separating bottle and in it liquid quality, be designated as m₁；

9th, clean separating bottle, dry and measure its quality, be designated as m', repeat step 1-8, this time plunger of pvt container Numerical value change is designated as (w₂-w₂'), gas gauge reading is designated as v₂, the reading of separating bottle is designated as v₂, separating bottle and liquid in it Quality is designated as m₂；

10th, co is calculated by following process₂Solubility in crude oil and water:

1. utilize equation group (1), (2) to carry out solving equation group twice and respectively obtain oil in oil-water emulsion in two sub-samplings Respective volume v with water_o1、v_w1、v_o2、v_w2(cm³)；

2. according to 1. acquired results, the group that establishes an equation (3) tries to achieve gas-oil ratio and gas-water ratio r₀、r_w；

3. obtain oil dissolving co in one group of data by 2. acquired results₂Volume v_og(cm³) and water dissolves co₂Volume v_wg(cm³), and then by known crude oil and water in normal temperature and pressure (t₀、p₀) under density p_oc、ρ_wcWith relative molecular mass m_o、 m_wAnd unit conversion expression (4), the size obtaining solubility is respectively s_o、s_w(mol/mol)；

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o1}+{\mathrm{\ρ}}_w{v}_{w1}=m_1-m_0\\ v_{o1}+v_{w1}=v_1\end{array}\right.---\left(1\right)$

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o2}+{\mathrm{\ρ}}_w{v}_{w2}=m_2-m^{\′}\\ v_{o2}+v_{w2}=v_2\end{array}\right.---\left(2\right)$

$\left\{\begin{array}{c}{r}_0{v}_{o1}+r_w{v}_{w1}=v_1\\ r_0{v}_{o2}+r_w{v}_{w2}=v_2\end{array}\right.---\left(3\right)$

$\left\{\begin{array}{c}{s}_o=(p_0{v}_{\mathrm{og}}/{\mathrm{zrt}}_0)/[(p_0{v}_{\mathrm{og}}/{\mathrm{zrt}}_0)+(v_{o1}{\mathrm{\ρ}}_{\mathrm{oc}}/m_o)]\\ s_w=(p_0{v}_{\mathrm{wg}}/{\mathrm{zrt}}_0)/[(p_0{v}_{\mathrm{wg}}/{\mathrm{zrt}}_0)+(v_{w1}{\mathrm{\ρ}}_{\mathrm{wc}}/m_w)]\end{array}\right.---\left(4\right)$

The apparatus and method of measurement carbon dioxide solubility in crude oil and water that the present invention provides, can measure exhaustion oil Hide co in oil-water emulsion system₂Solubility in crude oil and water.The method of the present invention passes through easy computational methods can be real Now do not solve co by separating oil-water emulsion system in exhaustion oil reservoir₂Solubility in oil phase and aqueous phase, thus know co₂Bury situation in exhaustion oil reservoir.This test device and method not only can conveniently solve co₂Solubility, also Can predict and co for burying of exhaustion oil reservoir from now on₂The quantitative forecast of technology of reservoir sweep and numerical simulation provide reliably theory Support.

The measurement carbon dioxide that the present invention provides in crude oil and water the apparatus and method of solubility and existing device and Method compares, and has the advantage that

The method of measurement carbon dioxide solubility in crude oil and water of the present invention is by obtaining two using easy algorithm Carbonoxide, in the solubility of oil phase and aqueous phase, avoids the oil-water emulsion system water-oil separating problem of complexity；

Measurement carbon dioxide apparatus and method of solubility in crude oil and water of the present invention achieve the two of exhaustion oil reservoir Carbonoxide buries prediction, is that the conceptual design of carbon dioxide discharge-reduction provides data basis, simultaneously for co₂The mining site of technology of reservoir sweep Technology and numerical simulation etc. provide theoretical guarantee；

The apparatus and method of measurement carbon dioxide solubility in crude oil and water of the present invention are to carbonate deposition, Global Carbon The research such as circulation is significant.

Brief description

Fig. 1 is co in the measurement exhaustion oil reservoir oil-water emulsion system in embodiment 1₂The device of solubility in crude oil and water Structural representation.

Fig. 2 is co in measurement exhaustion oil reservoir oil-water emulsion system in embodiment 1₂In the device of solubility in crude oil and water Pvt container structural representation.

Main Reference label declaration:

1 post pump plug, 2 first intermediate receptacle 3 second intermediate receptacle 4 the 3rd intermediate receptacle 5 video camera 6pvt container 7 Plunger 8 pressure gauge, 9 separating bottle 10 gas indicates bottle 11 gas gauge, 12 first valve 13 second valve 14 the 3rd valve 15 4th valve 16 the 5th valve 17 the 6th valve 18 the 7th valve

Specific embodiment

In order to be more clearly understood to the technical characteristic of the present invention, purpose and beneficial effect, the now skill to the present invention Art scheme carry out described further below, but it is not intended that to the present invention can practical range restriction.

Embodiment 1

Present embodiments provide co in a kind of measurement exhaustion oil reservoir oil-water emulsion system₂The dress of solubility in crude oil and water Put, the structural representation of this device as shown in figure 1, this device include plunger displacement pump 1, the first intermediate receptacle 2, the second intermediate receptacle 3, 3rd intermediate receptacle 4, video camera 5, pvt container 6, separating bottle 9, gas instruction bottle 10；Wherein, the structure of pvt container 6 such as Fig. 2 Shown；

Pvt container 6 is linked with pressure gauge 8, and pvt container 6 can carry out magnetic agitation and be provided with plunger 7；

Plunger displacement pump 1 is connected with the first intermediate receptacle 2 by the 5th valve 16 positioned at the first intermediate receptacle 2 lower section, described First intermediate receptacle 2 is connected with pvt container 6 by the first valve 12 positioned at the first intermediate receptacle 2 top；

Plunger displacement pump 1 is connected with the second intermediate receptacle 3 by the 6th valve 17 positioned at the second intermediate receptacle 3 lower section, described Second intermediate receptacle 3 is connected with pvt container 6 by the second valve 13 positioned at the second intermediate receptacle 3 top；

Plunger displacement pump 1 is connected with the 3rd intermediate receptacle 4 by the 7th valve 18 positioned at the 3rd intermediate receptacle 4 lower section, described 3rd intermediate receptacle 4 is connected with pvt container 6 by the 3rd valve 14 positioned at the 3rd intermediate receptacle 4 top；

Separating bottle 9 is connected with pvt container 6 by the 4th valve 15 positioned at pvt container 6 lower section；Separating bottle 9 be provided with The gas instruction bottle 10 of gas gauge 11 connects.

The present embodiment additionally provides using co in above-mentioned measurement exhaustion oil reservoir oil-water emulsion system₂Crude oil and water dissolve Co in the measurement device exhaustion oil reservoir oil-water emulsion system of degree₂The method of solubility in crude oil and water, the method includes following Step:

1st, all valves are closed, the quality using balance measurement separating bottle is 38.8245g；

2nd, open the 3rd valve 14, the 7th valve 18, injected for pvt container 6 for 30mpa using plunger displacement pump 1 adjustment pressure Salt solution in 3rd intermediate receptacle 4 of 20ml；

3rd, close the 3rd valve 14, the 7th valve 18, open the 5th valve 16, the first valve 12, existed using plunger displacement pump 1 It is crude oil that pvt container 6 injects in first intermediate receptacle 2 of 20ml under 30mpa so that oil water mixture in pvt container 6 Regulation salinity is 8000mg/l；

4th, close the 5th valve 16, the first valve 12, open the 6th valve 17, the second valve 13, existed using plunger displacement pump 1 It is the co that pvt container 6 injects in second intermediate receptacle 3 of 20ml under 30mpa₂Gas, closes the 6th valve 17, the second valve 13；

5th, pvt container 6 is heated to 50 DEG C, is pressurizeed for pvt container 6 by advancing the plunger 7 of pvt container 6, pressure is apparent Examine pressure change to institute measuring pressure 10mpa, the density of the salt solution in the 3rd intermediate receptacle 4 is at pressure and temperature 1.0028g/cm³, the density of the crude oil in the first intermediate receptacle 2 is 0.8376g/cm³；

6th, it is sufficiently stirred for the mixed system in pvt container 6 while pvt container 6 pressurization using magnetic stirring apparatus, simultaneously Observe the situation of change of mixed system in pvt container 6 by video camera 5；

7th, open the 4th valve 15, promote the plunger 7 of pvt container 6, treat no longer have bubble to produce in gas instruction bottle 10 When, the change of the plunger numerical value of record pvt container 6 turns to (75.7685-64.8668cm), the reading of gas gauge 11 now 900cm³, now the volume of separating bottle be recorded as 9.3cm³, close the 4th valve 15；

8th, with balance weighing apparatus measurement now separating bottle 9 and in it quality of liquid be 46.8654g；

9th, clean separating bottle, drying and measure its quality is 37.5873g, repeats experimental procedure 1-8, this time pvt container 6 Plunger 7 numerical value change be (64.8668-54.3784) cm, gas gauge 11 reading be 832cm³, the reading of separating bottle is 9.2cm³, separating bottle 9 and in it liquid quality be 45.7103g；

10th, it is calculated as below:

1. utilize equation group (1), (2) to carry out solving equation group twice and respectively obtain oil in oil-water emulsion in two sub-samplings Respective volume v with water_o1、v_w1、v_o2、v_w2(cm³)；

2. according to 1. acquired results, the group that establishes an equation (3) tries to achieve gas-oil ratio and gas-water ratio r₀、r_w；

3. obtain oil dissolving co in one group of data by 2. acquired results₂Volume v_og(cm³) and water dissolves co₂Volume v_wg(cm³), and then pass through known crude oil and water normal temperature and pressure (t₀、p₀) under density p_oc、ρ_wcWith relative molecular mass m_o、m_w And unit conversion expression (4), the size obtaining solubility is respectively s_o、s_w(mol/mol)；

$\left\{\begin{array}{c}{0.8376v}_{o1}+{1.0028v}_{w1}=46.8654-38.8245\\ v_{o1}+v_{w1}=9.3\end{array}\right.---\left(\text{1}\right)$

Solved by equation group (1)

$\left\{\begin{array}{c}{v}_{o1}=7.7793{\mathrm{cm}}^3\\ v_{w1}=1.5207{\mathrm{cm}}^3\end{array}\right.$

$\left\{\begin{array}{c}{0.8376v}_{o2}+{1.0028v}_{w2}=45.7103-37.5873\\ v_{o1}+v_{w1}=9.2\end{array}\right.---\left(2\right)$

Solved by equation group (2)

$\left\{\begin{array}{c}{v}_{o2}=6.7298{\mathrm{cm}}^3\\ v_{w2}=2.4702{\mathrm{cm}}^3\end{array}\right.$

$\left\{\begin{array}{c}{7.7793r}_0+{1.5207r}_w=900\\ {6.7298r}_0+{2.4702r}_w=83\end{array}\right.---\left(3\right)$

Solved by equation group (3)

r₀=106.65

r_w=46.26

Thus obtaining in first group of experiment

v_og=106.65 × 7.7793=829.66cm³

v_wg=46.26 × 1.5207=70.34cm³

Obtaining solubility is

$\left\{\begin{array}{c}{s}_o=({829.66p}_0/{\mathrm{zrt}}_0)/[({829.66p}_0/{\mathrm{zrt}}_0)+({7.7793\mathrm{\ρ}}_{\mathrm{oc}}/m_o)]\\ s_w=({70.34p}_0/{\mathrm{zrt}}_0)/[({70.34p}_0/{\mathrm{zrt}}_0)+({1.5207\mathrm{\ρ}}_{\mathrm{wc}}/m_w)]\end{array}\right.---\left(4\right)$

Wherein, z tables look-up and can obtain, r ≈ 8.314j/ (mol k).

The above-mentioned measurement apparatus of the present embodiment and method relatively can simply and more accurately solve co₂In crude oil and water Solubility, illustrate the validity of the method.The method is to study co from now on₂Geological storage in exhaustion oil reservoir, provides Effectively test and computational methods for one, the solution co of quantitation₂Reduction of discharging problem in reservoir geology is buried, simultaneously for co₂The displacement of reservoir oil Application in oil reservoir for the technology is provided fundamental basis.

It is not both with the method having measured solubility: the measurement apparatus of the present embodiment and method can pass through laboratory facilities And easier method of testing obtains the parameter of solubility, solve existing exhaustion oil reservoir oil-water emulsion system more difficult detached Technical problem, the solubility parameter obtaining is co₂The field test driving and numerical simulation provide certain guidance, simultaneously for The deposition of carbonate, the research of global carbon are provided fundamental basis.

Claims (7)

1. a kind of method of measurement carbon dioxide solubility in crude oil and water, the method pass through to measure carbon dioxide in crude oil and In water, the device of solubility is carried out, and the method comprises the following steps:

Step one: measurement separating bottle quality；

Step 2: to pvt container injection salt solution, crude oil, make the salinity of the oil water mixture in pvt container reach predetermined value, Then the co of below the 80mol% of oil water mixture is accounted for the injection of pvt container₂Gas；

Step 3: it is -180 DEG C of room temperature that pvt container is heated to temperature, and is forced into 0-150mpa to pvt container, in described pressure Power and at a temperature of, calculate the density of described salt solution and the density of described crude oil；

Step 4: promote the plunger of pvt container, when no longer having bubble to produce in gas instruction bottle, the plunger of record pvt container Numerical value change, and record the volume of gas gauge reading now and separating bottle；

Step 5: weigh separating bottle and in it liquid quality；

Step 6: cleaning separating bottle is simultaneously dried, and measures its quality；

Repeat step one to step 6 it is ensured that the volume of two sub-samplings is different, the numerical value of the plunger of record pvt container becomes Change, gas gauge reading, separating bottle reading, separating bottle and in it liquid quality；

Step 7: according to the data of above-mentioned record, calculate co₂Solubility in crude oil and water, completes co₂In crude oil and water The measurement of solubility；

Wherein, calculate co by following steps₂Solubility s in crude oil_wAnd co₂Solubility s in water_o:

First, according to separating bottle quality m₀, the density p of salt solution_w, the density p of crude oil_o, separating bottle and in it liquid quality m₁、 Repeat test in separating bottle quality m', repeat test in separating bottle and in it liquid quality m₂, carried out using equation group 1,2 Solving equation group respectively obtains oil and respective volume v of water in oil-water emulsion in two sub-samplings twice_o1、v_w1、v_o2、v_w2, unit For cm³；

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o1}+{\mathrm{\ρ}}_w{v}_{w1}=m_1-m_0\\ v_{o1}+v_{w1}=v_1\end{array}\right.---1$

$\left\{\begin{array}{c}{\mathrm{\ρ}}_o{v}_{o2}+{\mathrm{\ρ}}_w{v}_{w2}=m_2-m^{\′}\\ v_{o2}+v_{w2}=v_2\end{array}\right.---2$

Then, acquired results are substituted into equation group 3, according to gas gauge reading v₁, volume v of separating bottle₁, repeat test in tolerance Meter reading v₂, repeat test in separating bottle volume v₂, try to achieve gas-oil ratio r₀With gas-water ratio r_w；

$\left\{\begin{array}{c}{r}_o{v}_{o1}+r_w{v}_{w1}=v_1\\ r_o{v}_{o2}+r_w{v}_{w2}=v_2\end{array}\right.---3$

$\left\{\begin{array}{c}{s}_o=\frac{p_0{v}_{\mathrm{og}}/{\mathrm{zrt}}_0}{\frac{p_0{v}_{\mathrm{og}}}{{\mathrm{zrt}}_0}+\frac{v_{o1}\×{\mathrm{\ρ}}_{\mathrm{oc}}}{m_o}}\\ s_w=\frac{p_0{v}_{\mathrm{wg}}/{\mathrm{zrt}}_0}{\frac{p_0{v}_{\mathrm{wg}}}{{\mathrm{zrt}}_0}+\frac{v_{w1}\×{\mathrm{\ρ}}_{\mathrm{wc}}}{m_w}}\end{array}\right.---4$

Finally, obtain crude oil by acquired results and dissolve co₂Volume v_og, unit is cm³, and water dissolves co₂Volume v_wg, Unit is cm³, and then the density p at normal temperatures and pressures by known crude oil and water_oc、ρ_wcWith relative molecular mass m_o、m_wWith And formula 4, obtain co₂Solubility s in crude oil_wAnd co₂Solubility s in water_o, unit is mol/mol；

Described measurement carbon dioxide device of solubility in crude oil and water include plunger displacement pump, the first intermediate receptacle, in the middle of second Container, the 3rd intermediate receptacle, video camera, pvt container, separating bottle, gas instruction bottle；

Described pvt container is connected with pressure gauge, and described pvt container is provided with plunger and visual windows；

Described plunger displacement pump is connected with the first intermediate receptacle by the 5th valve, and described first intermediate receptacle passes through the first valve and institute State pvt reservoir；

Described plunger displacement pump is connected with the second intermediate receptacle by the 6th valve, and described second intermediate receptacle passes through the second valve and institute State pvt reservoir；

Described plunger displacement pump is connected with the 3rd intermediate receptacle by the 7th valve, and described 3rd intermediate receptacle passes through the 3rd valve and institute State pvt reservoir；

Described video camera is arranged on the visual windows side of described pvt container；

Described pvt container is connected with described separating bottle by the 4th valve；

Described separating bottle is connected with described gas instruction bottle；

Described gas instruction bottle is connected with gas gauge.

2. the method for measurement carbon dioxide solubility in crude oil and water according to claim 1 is it is characterised in that in institute State in step 3, it is -180 DEG C of room temperature that pvt container is heated to temperature, and is forced into below 150mpa to pvt container, described Under pressure and temperature, calculate the density of described salt solution and the density of described crude oil.

3. the method for measurement carbon dioxide solubility in crude oil and water according to claim 1 is it is characterised in that the party Method co be applied to measurement exhaustion oil reservoir₂Solubility in crude oil and water.

4. the method for measurement carbon dioxide solubility in crude oil and water according to claim 1 is it is characterised in that utilize Salt solution, crude oil and co in pvt container described in camera record₂The situation of change of the mixed system of three.

5. the method for measurement carbon dioxide solubility in crude oil and water according to claim 1 is it is characterised in that described Separating bottle lower end is provided with balance.

6. according to claim 1 measurement carbon dioxide solubility in crude oil and water method it is characterised in that with institute The pipeline stating plunger displacement pump connection divides three to connect with the 5th valve, the 6th valve, the 7th valve respectively.

7. according to claim 1 measurement carbon dioxide solubility in crude oil and water method it is characterised in that with institute The pipeline stating pvt reservoir divides three to connect with the first valve, the second valve, the 3rd valve respectively.