CN104406878A - 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 measuring carbon dioxide solubleness in crude oil and water

Technical field

The present invention relates to a kind of method and apparatus measuring carbon dioxide solubleness in crude oil and water, in particular to method of testing and the device of carbon dioxide solubleness in crude oil and water in a kind of exhaustion reservoir oil water emulsification system, belong to oil recovery technical field of measurement and test.

Background technology

Along with the fast development of global industry, CO ₂isothermal chamber gas purging amount significantly rises, and causes global warming, causes the problem of a series of sternnesses such as sea level rise.Therefore, the efficient emission-reducing method of greenhouse gases becomes the focus of World Focusing.

Geological storage technology is considered to the approach the most effectively solving greenhouse gas emission at no distant date, and its main place of burying comprises exhausted hydrocarbon-bearing pool, the salt water bearing reservoir in deep, unworkable coal seam and deep-sea etc.Wherein, deep brine layer receives because it has the advantages such as distribution area is wide, thickness is large, storage volume is large and pays close attention to widely, but it is for CO ₂recycle and can not well embody.

The method that oil reservoir is buried then can solve the problem that above-mentioned deep brine layer is buried.Along with Some Domestic oil field has entered the continuous expansion of middle and later periods of exploitation and gas drive technology at home and abroad rig-site utilization scale, utilize exhaustion, oil reservoir that is discarded, High water cut buries CO ₂cO can not only be solved ₂emission problem simultaneously can recycle CO ₂carry out the displacement of reservoir oil thus the recovery ratio of raising crude oil, realize the doulbe-sides' victory of Social benefit and economic benefit.

The CO of exhaustion oil reservoir ₂bury technology, solubleness weighs the key parameter of its amount of burying, and how to obtain accurately, real CO ₂solubleness becomes the key technical problem that this area solution oil reservoir is buried.

Relevant CO at present ₂in crude oil and water, the method for testing of solubleness is mainly by oil-water separation two-phase, respectively oil phase and aqueous phase is carried out to flash distillation experiment thus obtains CO ₂solubleness in oil phase and aqueous phase.The method is for the CO in conventional oil reservoir ₂solubleness solves is effective, but inapplicable for exhaustion oil reservoir, and its reason is that the profit in exhaustion oil reservoir mainly exists with the form of emulsion fluid and not easily separated.Due in mining site design and reservoir simulation, all need CO under reservoir condition ₂the data of solubleness understand CO ₂cO in oil displacement process ₂rate of injection and injection rate IR.Therefore, CO in a kind of exhaustion reservoir oil water emulsification system is badly in need of ₂the method of testing of solubleness in crude oil and water.

Summary of the invention

In order to solve the problem, the object of the present invention is to provide a kind of method and apparatus measuring carbon dioxide solubleness in crude oil and water, the method and device are applicable to measure the solubleness of carbon dioxide in crude oil and water in exhaustion reservoir oil water emulsification system, and simple to operate, test result is accurate.

In order to achieve the above object, the present invention provide firstly a kind of device measuring carbon dioxide solubleness in crude oil and water, and this device comprises ram 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 tensimeter, and described PVT container is provided with plunger and visual windows;

Described ram pump is communicated with the first intermediate receptacle by the 5th valve, and described first intermediate receptacle is by the first valve and described PVT reservoir;

Described ram pump is communicated with the second intermediate receptacle by the 6th valve, and described second intermediate receptacle is by the second valve and described PVT reservoir;

Described ram pump is communicated with the 3rd intermediate receptacle by the 7th valve, and described 3rd intermediate receptacle is by the 3rd valve and described PVT reservoir;

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

Described separating bottle is by the 4th valve and described PVT reservoir; Described separating bottle and described gas indicate bottle to be communicated with; Described gas instruction bottle is connected with gasometer.

In the device of measurement carbon dioxide provided by the invention solubleness in crude oil and water, preferably, described separating bottle lower end is provided with balance.

According to specific embodiment of the invention scheme, preferably, described 5th valve is positioned at the below of described first intermediate receptacle, and described first valve is positioned at the top of described first intermediate receptacle.

According to specific embodiment of the invention scheme, preferably, described 6th valve is positioned at the below of described second intermediate receptacle, and described second valve is positioned at the top of described second intermediate receptacle.

According to specific embodiment of the invention scheme, preferably, described 7th valve is positioned at the below of described 3rd intermediate receptacle, and described 3rd valve is positioned at the top of described 3rd intermediate receptacle.

In the device of measurement carbon dioxide provided by the invention solubleness in crude oil and water, preferably, the pipeline be communicated with described ram pump divides three to be communicated with the 5th valve, the 6th valve, the 7th valve respectively.

In the device of measurement carbon dioxide provided by the invention solubleness in crude oil and water, preferably, divide three with the pipeline of described PVT reservoir to be communicated with the first valve, the second valve, the 3rd valve respectively.

According to specific embodiment of the invention scheme, preferably, described 4th valve is positioned at the below of described PVT container.

Present invention also offers a kind of method measuring carbon dioxide solubleness in crude oil and water, the method is undertaken by said apparatus, and the method comprises the following steps:

Step one: measure separating bottle quality;

Step 2: inject salt solution, crude oil to PVT container, make the salinity of the oil water mixture in PVT container reach predetermined value, wherein predetermined salinity is determined according to test situation, then injects the CO accounting for below oil water mixture 80mol% to PVT container ₂gas;

Step 3: PVT container being heated to temperature is room temperature-180 DEG C, and 0-150MPa (preferred below 150MPa) is forced into PVT container, at the stated pressure and temperature, calculate the density of described salt solution and the density of described crude oil;

Step 4: the plunger promoting PVT container, when no longer including bubble generation in gas instruction bottle, the numerical value change of the plunger of record PVT container, and record gasometer reading now and the volume of separating bottle;

Step 5: profit weighs with scale separating bottle and the quality of liquid in it;

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

Repeat step one to step 6, ensure that the volume of two sub-samplings is different, and record the numerical value change of the plunger of PVT container, gasometer reading, separating bottle reading, separating bottle and the quality of liquid in it;

Step 7: according to the data of above-mentioned record, calculates CO ₂solubleness in crude oil and water, completes CO ₂the measurement of solubleness in crude oil and water.

In the method for measurement carbon dioxide provided by the invention solubleness in crude oil and water, preferably, calculate CO by following steps ₂solubleness S in crude oil _wand CO ₂solubleness S in water _o:

First, according to separating bottle quality m ₀, salt solution density p _w, crude oil density p _o, separating bottle and the quality m of liquid in it ₁, separating bottle and the quality m of liquid in it in separating bottle quality m', revision test in revision test ₂, separating bottle volume v ₁, the volume v of separating bottle in revision test ₂, utilize system of equations 1,2 to carry out twice solving equation group and to obtain in two sub-samplings oil and water volume V separately in oil-water emulsion respectively _o1, V _w1, V _o2, V _w2, unit is cm ³;

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

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

Then, acquired results is substituted into system of equations 3, according to gasometer reading V ₁, gasometer reading V in revision test ₂, try to achieve output gas oil ratio R ₀with 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 T ₀, normal pressure P ₀, obtain crude oil by acquired results and dissolve CO ₂volume V _og, unit is cm ³, and water-soluble solution CO ₂volume V _wg, unit is cm ³, and then by known crude oil and water density p at normal temperatures and pressures _oc, ρ _wcwith relative molecular mass M _o, M _wand formula 4, obtain CO ₂solubleness S in crude oil _wand CO ₂solubleness S in water _o, unit is mol/mol

In the method for measurement carbon dioxide provided by the invention solubleness in crude oil and water, preferably, utilize the salt solution in PVT container described in described camera record, crude oil and CO ₂the situation of change of the mixed system of three.

The apparatus and method of measurement carbon dioxide provided by the invention solubleness in crude oil and water can measure the solubleness of carbon dioxide in crude oil and water in exhaustion reservoir oil water emulsification system.

Use the measurement device CO of measurement carbon dioxide provided by the invention solubleness in crude oil and water ₂during solubleness in crude oil and water, specifically comprise the following steps:

1, close all valves, utilize balance measurement separating bottle quality, be designated as m ₀;

2, open the 3rd valve, the 7th valve, utilize ram pump for the salt solution of PVT container injection appropriate volume;

3, close the 3rd valve, the 7th valve, open the 5th valve, the first valve, utilize ram pump for the crude oil of PVT container injection certain volume, make the oil water mixture in PVT container reach predetermined salinity, wherein predetermined salinity is determined according to test situation;

4, close the 5th valve, the first valve, open the second valve, the 6th valve, utilize ram pump for the CO of PVT container injection appropriate volume ₂, close the second valve, the 6th valve;

5, heat PVT container, by advancing the plunger of PVT container to be the pressurization of PVT container, tensimeter is observed pressure and is changed to pressure P, and the density of salt solution is designated as ρ at pressure and temperature _w, the density of crude oil is designated as ρ _o, measure CO under this temperature and pressure ₂solubleness in crude oil and water;

6, to the mixed system (salt solution, crude oil and the CO that fully stir while the pressurization of PVT container in PVT container ₂mixed system), simultaneously by the situation of change of mixed system in cameras observe PVT container;

7, open the 4th valve, promote the plunger of PVT container, when no longer including bubble generation in gas instruction bottle, record plunger numerical value change (W ₁-w ₁'), and record gasometer reading V now ₁with the volume v of separating bottle ₁, close the 4th valve;

8, measure now separating bottle with balance weighing apparatus and the quality of liquid in it, be designated as m ₁;

9, clean separating bottle, dry and measure its quality, being designated as m', repeat step 1-8, this time the numerical value change of the plunger of PVT container is designated as (W ₂-w ₂'), gasometer reading is designated as V ₂, the reading of separating bottle is designated as v ₂, separating bottle and in it quality of liquid be designated as m ₂;

10, CO is obtained by following process computation ₂solubleness in crude oil and water:

1. utilize system of equations (1), (2) carry out twice solving equation group and to obtain in two sub-samplings oil and water volume V separately in oil-water emulsion respectively _o1, V _w1, V _o2, V _w2(cm ³);

2. basis 1. acquired results, the group that establishes an equation (3) tries to achieve output gas oil ratio and gas-water ratio R ₀, R _w;

3. obtain oil in one group of data by 2. acquired results and dissolve CO ₂volume V _og(cm ³) and water-soluble solution CO ₂volume V _wg(cm ³), and then by known crude oil and water at normal temperature and pressure (T ₀, P ₀) under density p _oc, ρ _wcwith relative molecular mass M _o, M _wand unit conversion expression (4), the size obtaining solubleness 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 provided by the invention solubleness in crude oil and water, can measure CO in exhaustion reservoir oil water emulsification system ₂solubleness in crude oil and water.Method of the present invention can realize not solving CO by being separated oil-water emulsion system in exhaustion oil reservoir by easy computing method ₂solubleness in oil phase and aqueous phase, thus know CO ₂situation is buried in exhaustion oil reservoir.This proving installation and method not only conveniently can solve CO ₂solubleness, prediction and CO can also be buried for exhaustion oil reservoir from now on ₂the quantitative forecast of technology of reservoir sweep and numerical simulation provide reliable theories integration.

The apparatus and method of measurement carbon dioxide provided by the invention solubleness in crude oil and water compare with existing apparatus and method, have the following advantages:

The method of measurement carbon dioxide of the present invention solubleness in crude oil and water obtains the solubleness of carbon dioxide at oil phase and aqueous phase by adopting easy algorithm, avoids complicated oil-water emulsion system oil and water separation problem;

The carbon dioxide that the apparatus and method of measurement carbon dioxide of the present invention solubleness in crude oil and water achieve exhaustion oil reservoir buries prediction, and the conceptual design for carbon dioxide discharge-reduction provides data basis, is CO simultaneously ₂the mining site technology of technology of reservoir sweep and numerical simulation etc. provide theoretical and ensure;

The apparatus and method of measurement carbon dioxide of the present invention solubleness in crude oil and water are significant to the research such as carbonate deposition, global carbon.

Accompanying drawing explanation

Fig. 1 is CO in the measurement exhaustion reservoir oil water emulsification system in embodiment 1 ₂the structural representation of the device of solubleness in crude oil and water.

Fig. 2 measures CO in exhaustion reservoir oil water emulsification system in embodiment 1 ₂in crude oil and water solubleness device in the structural representation of PVT container.

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 tensimeter 9 separating bottle 10 gas instruction bottle 11 gasometer 12 first valve 13 second valve 14 the 3rd valve 15 the 4th valve 16 the 5th valve 17 the 6th valve 18 the 7th valve

Embodiment

In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as to of the present invention can the restriction of practical range.

Embodiment 1

Present embodiments provide CO in a kind of measurement exhaustion reservoir oil water emulsification system ₂the device of solubleness in crude oil and water, as shown in Figure 1, this device comprises ram pump 1, first intermediate receptacle 2, second intermediate receptacle 3, the 3rd intermediate receptacle 4, video camera 5, PVT container 6, separating bottle 9, gas instruction bottle 10 to the structural representation of this device; Wherein, the structure of PVT container 6 as shown in Figure 2;

PVT container 6 links with tensimeter 8, and PVT container 6 can carry out magnetic agitation and be provided with plunger 7;

Ram pump 1 is communicated with the first intermediate receptacle 2 by the 5th valve 16 be positioned at below the first intermediate receptacle 2, and described first intermediate receptacle 2 is communicated with PVT container 6 by the first valve 12 be positioned at above the first intermediate receptacle 2;

Ram pump 1 is communicated with the second intermediate receptacle 3 by the 6th valve 17 be positioned at below the second intermediate receptacle 3, and described second intermediate receptacle 3 is communicated with PVT container 6 by the second valve 13 be positioned at above the second intermediate receptacle 3;

Ram pump 1 is communicated with the 3rd intermediate receptacle 4 by the 7th valve 18 be positioned at below the 3rd intermediate receptacle 4, and described 3rd intermediate receptacle 4 is communicated with PVT container 6 by the 3rd valve 14 be positioned at above the 3rd intermediate receptacle 4;

Separating bottle 9 is communicated with PVT container 6 by the 4th valve 15 be positioned at below PVT container 6; Separating bottle 9 indicates bottle 10 to be communicated with the gas being provided with gasometer 11.

The present embodiment additionally provides and uses CO in above-mentioned measurement exhaustion reservoir oil water emulsification system ₂in crude oil and water solubleness measurement device exhaustion reservoir oil water emulsification system in CO ₂the method of solubleness in crude oil and water, the method comprises the following steps:

1, close all valves, utilize the quality of balance measurement separating bottle for 38.8245g;

2, the 3rd valve 14, the 7th valve 18 is opened, utilize ram pump 1 to adjust pressure injects the 3rd intermediate receptacle 4 of 20mL for PVT container 6 salt solution for 30Mpa;

3, the 3rd valve 14, the 7th valve 18 is closed, open the 5th valve 16, first valve 12, utilize ram pump 1 to be the crude oil that PVT container 6 injects first intermediate receptacle 2 of 20mL under 30Mpa, make the regulation salinity of the oil water mixture in PVT container 6 be 8000mg/L;

4, close the 5th valve 16, first valve 12, open the 6th valve 17, second valve 13, utilize ram pump 1 to be the CO that PVT container 6 injects second intermediate receptacle 3 of 20mL under 30Mpa ₂gas, closes the 6th valve 17, second valve 13;

5, PVT container 6 is heated to 50 DEG C, by advancing the plunger 7 of PVT container 6 to pressurize for PVT container 6, tensimeter is observed pressure and is changed to institute measuring pressure 10MPa, and the density of the salt solution at pressure and temperature in the 3rd intermediate receptacle 4 is 1.0028g/cm ³, the density of the crude oil in the first intermediate receptacle 2 is 0.8376g/cm ³;

6, utilize magnetic stirring apparatus fully to stir mixed system in PVT container 6 while pressurizeing to PVT container 6, observed the situation of change of mixed system in PVT container 6 simultaneously by video camera 5;

7, open the 4th valve 15, promote the plunger 7 of PVT container 6, when no longer including bubble generation in gas instruction bottle 10, record being changed to (75.7685-64.8668cm) of the plunger numerical value of PVT container 6, the reading 900cm of gasometer 11 now ³, now the volume of separating bottle is recorded as 9.3cm ³, close the 4th valve 15;

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

9, clean separating bottle, drying and measuring its quality is 37.5873g, repeats experimental procedure 1-8, and this time the numerical value change of the plunger 7 of PVT container 6 is (64.8668-54.3784) cm, and gasometer 11 reading is 832cm ³, the reading of separating bottle is 9.2cm ³, separating bottle 9 and in it quality of liquid be 45.7103g;

10, calculate as follows:

1. utilize system of equations (1), (2) carry out twice solving equation group and to obtain in two sub-samplings oil and water volume V separately in oil-water emulsion respectively _o1, V _w1, V _o2, V _w2(cm ³);

2. basis 1. acquired results, the group that establishes an equation (3) tries to achieve output gas oil ratio and gas-water ratio R ₀, R _w;

3. obtain oil in one group of data by 2. acquired results and dissolve CO ₂volume V _og(cm ³) and water-soluble solution CO ₂volume V _wg(cm ³), and then by known crude oil and water normal temperature and pressure (T ₀, P ₀) under density p _oc, ρ _wcwith relative molecular mass M _o, M _wand unit conversion expression (4), the size obtaining solubleness 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 system of equations (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 system of equations (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 system of equations (3)

R ₀＝106.65

R _w＝46.26

Thus obtain in first group of experiment

V _og＝106.65×7.7793＝829.66cm ³

V _wg＝46.26×1.5207＝70.34cm ³

Obtaining solubleness 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/ (molK).

The above-mentioned measurement mechanism of the present embodiment and method can more simply and solve CO more accurately ₂solubleness in crude oil and water, describes the validity of the method.The method is for study CO from now on ₂geological storage in exhaustion oil reservoir, provides experiment and computing method effectively, quantitative solution CO ₂reduction of discharging problem in reservoir geology is buried is CO simultaneously ₂the application of technology of reservoir sweep in oil reservoir is provided fundamental basis.

Be not both with the method for existing measurement solubleness: the measurement mechanism of the present embodiment and method means and easier method of testing can obtain the parameter of solubleness by experiment, solve the technical matters of the more difficult separation of existing exhaustion reservoir oil water emulsification system, the solubility parameter obtained is CO ₂the field test driven and numerical simulation provide certain guidance, provide fundamental basis for the deposition of carbonate, the research of global carbon simultaneously.

Claims (8)

1. measure a device for carbon dioxide solubleness in crude oil and water, this device comprises ram 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 tensimeter, and described PVT container is provided with plunger and visual windows;

Described ram pump is communicated with the first intermediate receptacle by the 5th valve, and described first intermediate receptacle is by the first valve and described PVT reservoir;

Described ram pump is communicated with the second intermediate receptacle by the 6th valve, and described second intermediate receptacle is by the second valve and described PVT reservoir;

Described ram pump is communicated with the 3rd intermediate receptacle by the 7th valve, and described 3rd intermediate receptacle is by the 3rd valve and described PVT reservoir;

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

Described PVT container is communicated with described separating bottle by the 4th valve;

Described separating bottle and described gas indicate bottle to be communicated with;

Described gas instruction bottle is connected with gasometer.

2. the device of measurement carbon dioxide according to claim 1 solubleness in crude oil and water, is characterized in that, described separating bottle lower end is provided with balance.

3. the device of measurement carbon dioxide according to claim 1 solubleness in crude oil and water, is characterized in that, the pipeline be communicated with described ram pump divides three to be communicated with the 5th valve, the 6th valve, the 7th valve respectively.

4. the device of measurement carbon dioxide according to claim 1 solubleness in crude oil and water, is characterized in that, divides three to be communicated with the first valve, the second valve, the 3rd valve respectively with the pipeline of described PVT reservoir.

5. measure a method for carbon dioxide solubleness in crude oil and water, the method is undertaken by the device of the measurement carbon dioxide solubleness in crude oil and water described in any one of claim 1-4, and the method comprises the following steps:

Step one: measure separating bottle quality;

Step 2: inject salt solution, crude oil to PVT container, make the salinity of the oil water mixture in PVT container reach predetermined value, then injects the CO accounting for below the 80mol% of oil water mixture to PVT container ₂gas;

Step 3: PVT container being heated to temperature is room temperature-180 DEG C, and is forced into 0-150MPa to PVT container, is preferably below 150MPa, at the stated pressure and temperature, calculates the density of described salt solution and the density of described crude oil;

Step 4: the plunger promoting PVT container, when no longer including bubble generation in gas instruction bottle, the numerical value change of the plunger of record PVT container, and record gasometer reading now and the volume of separating bottle;

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

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

Repeat step one to step 6, ensure that the volume of two sub-samplings is different, the numerical value change of the plunger of record PVT container, gasometer reading, separating bottle reading, separating bottle and the quality of liquid in it;

Step 7: according to the data of above-mentioned record, calculates CO ₂solubleness in crude oil and water, completes CO ₂the measurement of solubleness in crude oil and water.

6. the method for measurement carbon dioxide according to claim 5 solubleness in crude oil and water, is characterized in that, calculate CO by following steps ₂solubleness S in crude oil _wand CO ₂solubleness S in water _o:

First, according to separating bottle quality m ₀, salt solution density p _w, crude oil density p _o, separating bottle and the quality m of liquid in it ₁, separating bottle and the quality m of liquid in it in separating bottle quality m', revision test in revision test ₂, separating bottle volume v ₁, the volume v of separating bottle in revision test ₂, utilize system of equations 1,2 to carry out twice solving equation group and to obtain in two sub-samplings oil and water volume V separately in oil-water emulsion respectively _o1, V _w1, V _o2, V _w2, unit is cm ³;

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

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

Then, acquired results is substituted into system of equations 3, according to gasometer reading V ₁, gasometer reading V in revision test ₂, try to achieve output gas oil ratio R ₀with gas-water ratio R _w;

$\left\{\begin{array}{c}{R}_0{V}_{o1}+R_w{V}_{w1}=V_1\\ R_0{V}_{o2}+R_w{V}_{w2}=V_2\end{array}\right.---3$

$\left\{\begin{array}{c}{S}_o=(P_0{V}_{\mathrm{og}}/\mathrm{ZR}{T}_0)/[(P_0{V}_{\mathrm{og}}/\mathrm{ZR}{T}_0)+(V_{o1}{\mathrm{\ρ}}_{\mathrm{oc}}/M_o)]\\ S_w=(P_0{V}_{\mathrm{wg}}/{\mathrm{ZRT}}_0)/[(P_0{V}_{\mathrm{wg}}/{\mathrm{ZRT}}_0)+(V_{w1}{\mathrm{\ρ}}_{\mathrm{wc}}/M_w)]\end{array}\right.---4$

Finally, according to normal temperature T ₀, normal pressure P ₀, obtain crude oil by acquired results and dissolve CO ₂volume V _og, unit is cm ³, and water-soluble solution CO ₂volume V _wg, unit is cm ³, and then by known crude oil and water density p at normal temperatures and pressures _oc, ρ _wcwith relative molecular mass M _o, M _wand formula 4, obtain CO ₂solubleness S in crude oil _wand CO ₂solubleness S in water _o, unit is mol/mol.

7. the method for measurement carbon dioxide according to claim 5 solubleness in crude oil and water, is characterized in that, the method is applicable to measure CO in exhaustion oil reservoir ₂solubleness in crude oil and water.

8. the method for measurement carbon dioxide according to claim 5 solubleness in crude oil and water, is characterized in that, utilizes salt solution, crude oil and CO in PVT container described in described camera record ₂the situation of change of the mixed system of three.