CN100445514C - Layered steam distribution system for steam flooding and steam distribution method thereof - Google Patents

Abstract

The present invention relates to a layered steam distribution system for steam flooding and steam distribution and a method thereof, which belongs to a system used for thick oil steam flooding wells and a method thereof. The system comprises an oil well monitoring and metering unit, an oil well steam injecting data processing unit, a layered steam distribution unit, a display output unit and a layered test unit, wherein the oil well monitoring and metering unit and the layered test unit are respectively connected with the oil well steam injecting data processing unit, and steam injecting parameters are respectively transported to the oil well steam injecting data processing unit which outputs the data of layered steam distribution quantity to the layered steam distribution unit so as to carry out the layered steam distribution of an oil well; the oil well steam injecting data processing unit is connected with the display output unit and additionally outputs oil well data, each steam injecting parameter and steam injecting results. The present invention provides each layer of steam distribution quantity and the area of each steam distributing hole according to requirements, distributes layered steam flooding flow and has the advantages: realizing the layered steam injection of steam flooding, satisfying the layered test requirements of the steam flooding and realizing the adjustment of each layer of the steam injecting quantity in the process of the steam flooding.

Description

A kind of steam flooding steam distribution in separate layer system and join the vapour method

Technical field:

The invention belongs to a kind of system and method that is used for heavy crude heat extraction field steam flooding well, relate in particular to and a kind of the steam flooding well is carried out the system of steam distribution in separate layer and joins the vapour method.

Background technology:

Viscous crude is the important component part in the petroleum hydrocarbon energy, has than the great potential of conventional crude resource up to several times, and China's viscous crude aboundresources accounts for 20% of petroleum resources amount.

Viscosity of thickened oil height, density are big, flow resistance is big in the exploitation, and not only displacement efficiency is low, and volume to sweep oily efficient also low, be difficult to exploit with conventional method.

In view of the characteristics of viscous crude, can improve recovery ratio by reducing viscosity of thickened oil, reducing flow resistance and come heavy crude producing effectively.The method that improves thick oil recovery ratio mainly contains: physics viscosity reduction (dilute, heat), chemical viscosity reduction (emulsification is moistening, visbreaking, Pintsch process).

Sum up various thickened oil recovery experiences, the viscosity temperature of viscous crude is very responsive in addition, we can say that the heat extraction by steam injection method is a kind of effective means of heavy crude producing.

China's heavy crude heat extraction technology is started late, but development is very fast.Cyclic steam stimulation method has become the major technique of heavy oil development.But up to the present, China has dropped into the most heavy crude reservoirs and the block of steam soak exploitation, enters the middle and later periods, and promptly the steam soak cycle is in 5 weeks more than it.Even have many oil reservoirs or block to take to beat infill well, proceed the steam incoming and outcoming exploitation, but the productive life of continuity be limited.After many rounds steam incoming and outcoming, the steam driving exploitation mode must be changed over to, recovery ratio could be effectively improved.Recent years, the result of the test of more than ten the steam flooding pilot test project that process all kinds oil reservoir is opened up has confirmed that it is successful technically, economically that heavy crude reservoir adopts the steam drive development mode.

To sum up, steam soak and steam flooding are two different operation stages in the oil development.Wherein, steam soak is to point to the steam that a bite producing well injects some in a short time continuously, then closing well (stewing well) a couple of days, heat is spread, afterwards opening well and making production again.After instantaneous oil production is reduced to certain level, carry out the notes vapour of next round, stewing well, oil recovery, so repeatedly, loop cycle, until oil well production increasing oil mass economy invalid or change other mining types into till.With steam flooding contrast, the steam soak small investment, technology is simple, producing cost is low.The rate of oil production height is a kind of main method that effectively improves the heavy crude reservoir rate of oil production.But its recovery ratio is low, for this reason, transfers steam driving exploitation to behind the steam soak generally speaking.

And steam flooding is widely used a kind of method in the hot-fluid injection.Steam flooding is meant that by preferred development system straticulate exploration, well pattern (well spacing), perforated zone etc. by injecting and injecting high-temperature wet steam vapour to oil reservoir continuously, heating and displacement crude oil are by the mining type of producing well extraction.When instantaneous gas oil ratio reached economic boundaries (being generally 0.15), steam flooding finished or changes into other mining types.

Steam distribution in separate layer system of the present invention and method thereof are developed at the steam flooding operation stage.

The steam flooding injection modes that adopt general steam injection were promptly annotated vapour (Michael Prats 1982) to several straticulate explorations simultaneously in the past.But, because the strata pressure of each series of strata, permeability, crude oil property etc. there are differences, make interlayer annotate vapour amount unreasonable distribution sometimes, even the steam zone that certain layer position occur sharply advance, do not reach the notes vapour effect of expection.For the multilayer heavy crude reservoir, because each layer physical properties of rock there are differences, and closing in the initial stage recovery process annotated to close and adopted, cause each layer development degree inequality, aggravated steam overlap and individual layer is advanced by leaps and bounds, the vertical sweep efficiency of injection mode of the general steam injections of adopting of steam flooding is in the past reduced more, influenced exploitation effect (as Fig. 1).

In the prior art, utility model patent steam distribution in separate layer process pipe string (application number is 01220374.2) and layered quantitative gas filling tubing string (application number is 02235425.3) provide in the steam incoming and outcoming exploitation of a kind of oil field and have improved the steam distribution in separate layer process pipe string of annotating the vapour quality, when having solved many rounds and generally having annotated vapour, because each layer of oil reservoir physical properties of rock there are differences, cause injecting-steam viscous crude oil well vertically to inhale the serious uneven problem of vapour, improve the notes way of steam, adjusted gas entry profile.It is effective to have the vapour of notes, increases advantages such as oil well output.The greatest problem of the existence of this method is can not regulate laminated distributor under well automatically according to bottom pressure to join the vapour amount.Thereby do not reach the notes vapour effect of expection.

Wherein, utility model patent steam distribution in separate layer process pipe string (application number is 01220374.2) is developed at cyclic steam stimulation process.Simultaneously, it can't realize the automatic adjusting of steam distribution in separate layer amount.According to its technical scheme, if will change the steam distribution in separate layer amount, then need a whole set of process pipe string integral body is taken out from the down-hole, regulate the steam distribution in separate layer mouth again.Construction technology is loaded down with trivial details relatively, cost is high and the activity duration is long.In addition, the 26S Proteasome Structure and Function that does not have the down-hole to monitor constantly in this piece technical scheme.Because it can't change the vapour amount of joining of regulating the distribution mouth with annotating the vapour amount, so it is not provided with the dynamic test structure and the method for laminated distributor under well.

Utility model patent thick oil thermal extraction high temperature Multi-parameter Combined Tool tester (application number is 03284848) is a kind of a kind of instrument of using in the oil well measurement test, the operation stage that belongs to the well head data test, each layer steam distribution in separate layer amount be analyzed, be calculated to steam distribution in separate layer need according to its data result of testing, at the concrete steam distribution in separate layer of implementing.

Because the pressure in the steam soak process in the stratum changes with annotating the vapour amount, be a homeostasis process of annotating vapour amount and pressure so reasonably annotate the vapour exploitation.For improving this dynamic adjustments function of above-mentioned laminated distributor.Patent oil well delamination steady gas filling device (application number is 02289214.1), self-adaptive laminated distributor under well (application number is 2004100746615) have overcome the deficiency of existing distributor, a kind of constant valve or self-adaptive laminated distributor under well are provided, and it can produce required notes vapour ratio according to the automatic vapour amount of annotating of regulating of the variation of the pressure in the stratum according to joining.

But above-mentioned patent all is to be applied in the steam soak development phase.The zonal testing requirement that layering vapour drives can not be satisfied, the adjustment of each layer notes vapour amount in the steam flooding process can not be realized.

In document " new development of steam flooding technology "-mention multilayer steam injection and injection profile measuring technique-be meant that the parallel two-tube method is used for same well, two different payzones carry out steam injection to be handled, this method is two tubing strings to be walked abreast be lowered in the pit shaft, with the two-tube thermal packer seat of a cover be placed on the top oil reservoir above, and a cover single tube packer seat is placed between two oil reservoirs.Between upper packer and lower packet, use adiabatic oil pipe, in the hope of reduce single tube and enter between the steam of top oil reservoir hot transmission.This method can not realize the purpose that same pit shaft multilayer while vapour drives.

At the technical problem of the steam distribution in separate layer of layering steam flooding in the prior art, hierarchical system of developing and designing and method should satisfy following characteristics:

1. realize the layer steam injection of steam flooding.

2. satisfy the zonal testing requirement of layering steam flooding.

3. realize the adjustment that each layer annotated the vapour amount in the steam flooding process.

Summary of the invention:

For solving the above-mentioned technical problem of steam flooding steam distribution in separate layer, the inventor has invented a kind of system and method for steam flooding steam distribution in separate layer by years of researches.It has realized characteristics and requirement that hierarchical system and method should satisfy.

The system and method for inventing a kind of steam flooding steam distribution in separate layer is to reduce interlayer interference when annotating vapour, improves vertical development degree of oil reservoir and the important means of improving the steam flooding effect.

Steam drives steam distribution in separate layer and realizes by the down-hole gas filling device, and the purpose of steam distribution in separate layer makes notes vapour forward position evenly advance exactly, avoids occurring the tonguing phenomenon, and reasonable distribution is annotated the vapour amount, annotates the vapour effect thereby improve.The technology principle of steam distribution in separate layer is:

1. according to the reservoir physical property of each substratum, rationally divide and annotate the vapour unit, annotate the reservoir physical property appropriate design steam injection rate of vapour unit according to each;

2. utilize the heating power packer that each is annotated vapour unit packing and open, prevent from that steam from annotating between vapour unit at each to scurry mutually;

3. annotate the vapour amount, the design laminated distributor according to the steam injection parameter (steam injection pressure, steam quality, vapor (steam) temperature, steam flow, tired fluence) and the oil well plan in this cycle in cycle on the oil well;

4. utilize laminated distributor that each unit is carried out quantitative gas filling, reach and both employ middle less permeable layer, bring into play the purpose of high permeability zone dump energy again.

Steam flooding steam distribution in separate layer system and method is achieved in that

A kind of steam flooding steam distribution in separate layer system comprises that oil well monitor metering units, oil well annotate vapour data processing unit and steam distribution in separate layer unit; Described oil well monitor metering units is annotated the vapour data processing unit with oil well and is connected, and steam injection parameter is transferred to oil well annotates the vapour data processing unit; Oil well is annotated the vapour data processing unit and is connected with the steam distribution in separate layer unit;

Wherein, described oil well is annotated the vapour data processing unit and is used to utilize every steam injection parameter to carry out the data processing of pressure drop, mass dryness fraction and steam distribution in separate layer amount, exports steam distribution in separate layer amount data to the steam distribution in separate layer unit, carries out oil well delamination and joins vapour; Described steam distribution in separate layer unit comprises the steam distribution in separate layer device, described steam distribution in separate layer device joins the vapour amount according to each layer of described oil well notes vapour data processing unit output and each layer joined the steam vent area, be provided with and regulate the area in each layer steam distribution in separate layer hole, carry out layering vapour and drive assignment of traffic;

Described steam flooding steam distribution in separate layer system also comprises the zonal testing unit, and state carried out zonal testing after described zonal testing unit was used for each layer joined vapour, and test data is transmitted back described oil well annotates the vapour data processing unit and carry out data and handle.，

Also comprise the demonstration output unit in the described steam flooding steam distribution in separate layer system, described demonstration output unit is annotated the vapour data processing unit with oil well and is connected, and described demonstration output unit is used for well information, every steam injection parameter and annotates the vapour result and export.

Above-mentioned oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module;

Described fluidised form judge module is used to judge the flow pattern of this position mixture;

Described data computation processing module comprises liquid holdup calculating section, on-way resistance coefficient calculations part, pressure drop calculating section, mass dryness fraction calculating section and steam distribution in separate layer amount calculating section; The data computation processing module is carried out the calculating of liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and steam distribution in separate layer amount successively to steam injection parameter according to different fluidised forms.

Wherein, the present invention during heterogeneous flow pressure drop, adopts Beggs Brill (Bei Gesibu Lille) method to carry out, comprising flow pattern discrimination, liquid holdup, on-way resistance coefficient and Calculation of Pressure Drop in calculate annotating the vapour pit shaft.

During the mass dryness fraction regularity of distribution of the present invention in calculating pit shaft, energy-balance equation is simplified under certain assumed condition, and the general solution that obtains the ODE of mass dryness fraction according to its fringe conditions is:

$x=e^b(-\frac{C_3}{C_2}{e}^k+x_0+\frac{C_3}{C_2})$

Wherein

$b=-\frac{C_2}{C_1}z;$ $k=\frac{C_2}{C_1}z.$

C ₁＝M(h _s-h _w+h _lg)

$C_2=M\left[\frac{\mathrm{dp}}{\mathrm{dz}}(\frac{{\mathrm{dh}}_s}{\mathrm{dp}}-\frac{{\mathrm{dh}}_w}{\mathrm{dp}})\right]$

$C_3=\frac{\mathrm{dQ}}{\mathrm{dz}}+M\left(\frac{\mathrm{dp}}{\mathrm{dz}}\right)\left(\frac{{\mathrm{dh}}_w}{\mathrm{dp}}\right)+\frac{M^3}{\left(A{\mathrm{\υ}}_m\right)}\frac{d(1/{\mathrm{\ρ}}_m)}{\mathrm{dz}}-\mathrm{Mg}$

In order to try to achieve C ₁, C ₂And C ₃, must provide h _wAnd h _sWith the relational expression of pressure, this can utilize the computer interpolation to draw according to the water vapour table.In addition, dQ obtains according to the equation of heat conduction.

Described oil well height iteration module is used for carrying out the height superposition from the well head of oil well to impact point, and the oil well monitor metering units extracts the steam injection parameter of oil well in proper order, handles so that monitor with data computation.

Described steam distribution in separate layer hole area setting module is handled the aperture area that each layer steam distribution in separate layer hole was calculated and set to the parameters that draws according to described data computation processing module.

The present invention is when the calculated hole diameters area, and it is mobile to suppose that gas-liquid two-phase fluid is done phase-splitting in joining steam vent, and liquid phase is an incompressible fluid, the flow coefficient C of gas-liquid two-phase _dIdentical, additional vaporization does not take place in flow process, the void fraction of gas phase is constant, and to flow through the pressure reduction of the pressure reduction of gas phase when joining steam vent and liquid phase simultaneously identical when two-phase, all equals two-phase fluid and flows through pressure differential deltap p when joining steam vent.According to energy equation and continuity equation formula, the design formulas that derives the orchestration hole area is

$A=\frac{G_{\mathrm{tp}}\sqrt{\stackrel{\‾}{\mathrm{\ρ}}}}{\sqrt{2{\mathrm{\ψ}}^2{C}_d^2{\mathrm{\ρ}}_l{\mathrm{\ρ}}_g(p-p_1)+G_{\mathrm{tp}}^2{\stackrel{\‾}{\mathrm{\ρ}}}^2/S^2}}$

Wherein

$\sqrt{\stackrel{\‾}{\mathrm{\ρ}}}=\mathrm{\ϵ}(1-x)\sqrt{{\mathrm{\ρ}}_g}+x\sqrt{{\mathrm{\ρ}}_l},$ Correction factor ε is that curvilinear regression is determined by experiment.

Described oil well monitor metering units is used for the oil well steam injection parameter is detected and measures, and comprises four parameter measurement instruments in the described oil well monitor metering units, and temperature, pressure, mass dryness fraction and steam injection rate parameter are detected and measure; Described four parameter measurement instruments are respectively turbine flowmeter, mass dryness fraction gauge, pressure sensor and temperature pick up;

Described zonal testing comprises four parameter measurement instruments in the unit, is used for that each layer joined the vapour parameter and tests and detect.

In concrete application, described steam distribution in separate layer unit comprises the steam distribution in separate layer device, and described steam distribution in separate layer device is eccentric steam distribution in separate layer device; It comprises the eccentric steam distribution in separate layer pit shaft of layering steam flooding, and described steam distribution in separate layer pit shaft comprises a steam injection string, it is characterized in that: also include packer in described steam injection string, described packer is separated into a component layers with steam injection string and annotates the vapour chamber; And in each layer steam injection chamber, be provided with an eccentric laminated distributor;

Described eccentric laminated distributor comprises eccentric steam distribution in separate layer valve core and joins the vapour seating nipple:

Described eccentric steam distribution in separate layer valve core includes fishing head, spool main body, steam inleting vent, joins vapour lock, vapor opening and aligns head; The fishing head of described eccentric steam distribution in separate layer valve core is by snap close and spool body lock; Described blowhole and vapor opening are arranged on the described spool main body; Join the bottom of vapour lock assembly, align head and be threaded, and compress and join vapour lock with the spool main body in the spool main body;

The described vapour seating nipple of joining includes top connection, joins vapour blanking plug cover for seat tube, admission opening, vapor opening, lower contact and seating nipple main body; Described top connection of joining the vapour seating nipple is connected with the two ends up and down of joining the vapour seating nipple respectively threadably with lower contact; The described vapour locking obturating plug sleeve of joining is solidificated in the described seating nipple main body; Described admission opening and vapor opening are arranged on the described seating nipple main body;

Described eccentric steam distribution in separate layer valve core is arranged on described the joining in the vapour blanking plug cover for seat tube of vapour seating nipple of joining, and the steam inleting vent of eccentric steam distribution in separate layer valve core and vapor opening are adaptive with admission opening of joining the vapour seating nipple and vapor opening respectively.

In concrete application, described eccentric steam distribution in separate layer valve core also includes pressure cap, cushion rubber, stage clip, torsion spring, axle and cam; The fishing head of described eccentric steam distribution in separate layer valve core is by snap close and spool body lock, and compresses by pressure cap; Pressure cap links to each other with the spool main body threadably by cushion rubber, is provided with stage clip between pressure cap and the fishing head, and torsion spring is fixed on the spool main body by axle, and the cam assembly is in the outside of torsion spring; Described blowhole and vapor opening are arranged on the described spool main body; Join vapour lock and be installed in the bottom of spool main body, align head and spool main body by being threaded, and compress and join vapour lock;

The described vapour seating nipple of joining also includes: cushion rubber, on connect sliding sleeve, connect sliding sleeve, support, guide way, screw and centralizer down, and be provided with the reaming of an evagination on the top of described steam distributing valve valve core case sleeve; Described top connection and lower contact respectively threadably with join the vapour seating nipple on be connected sliding sleeve with under be connected sliding sleeve and be threaded, lower contact is near guide way; The described vapour locking obturating plug sleeve of joining is fixed in the described seating nipple main body; Described admission opening and vapor opening are arranged on the described seating nipple main body; Described centralizer is fixedlyed connected with the seating nipple main body by screw; Screw is fixed on support on the seating nipple main body.Screw is fixed on guide way in the distributor lower contact;

The described vapour seating nipple of joining is fixedlyed connected with described each layer steam injection chamber; And described eccentric steam distribution in separate layer valve core is arranged on described the joining in the vapour blanking plug cover for seat tube of vapour seating nipple of joining: eccentric steam distribution in separate layer valve core align draw-in groove that head is provided with by its surface with join the vapour seating nipple join the clamping of vapour blanking plug cover for seat tube, adaptive with the position of admission opening of joining the vapour seating nipple and vapor opening respectively with steam inleting vent and the vapor opening of guaranteeing eccentric steam distribution in separate layer valve core; The outline of the cam supporting surface of described eccentric steam distribution in separate layer valve core is adaptive with the internal diameter of joining the reaming in the vapour blanking plug cover for seat tube of joining the vapour seating nipple.

In above-mentioned concrete application, cushion rubber in described eccentric steam distribution in separate layer valve core and the cushion rubber of joining in the vapour seating nipple are the high temperature resistant cushion rubber of O type;

The vapour lock of joining in described eccentric steam distribution in separate layer valve core is joined vapour lock for the Laval nozzle type.

In concrete application, the described length overall of vapour seating nipple of joining is at 500～2000mm; Its external diameter: 100～160mm; Minimum latus rectum: 50mm, operating pressure: 10～25Mpa in the tubing string;

Described vapour lock internal diameter: the 10～30mm that joins; Join vapour lock flow-passing surface adjusting range: 0---491mm ²

Among the present invention except can adopting eccentric steam distribution in separate layer device, described steam distribution in separate layer device can also be concentric steam distribution in separate layer device, it comprises the concentric steam distribution in separate layer pit shaft of layering steam flooding, described steam distribution in separate layer pit shaft comprises steam injection string and packer, and described packer is separated into a component layers with the steam distribution in separate layer pit shaft and annotates the vapour chamber; And in each layer steam injection chamber, be provided with a concentric laminated distributor;

Described concentric laminated distributor comprises concentric steam distribution in separate layer valve fixed valve body and movable spool; Described fixed valve body sidewall is provided with a vapor opening; Described movable valve core inside has a ventilation tubing string, and the outer ledge on described ventilation tubing string top is provided with external screw thread; The outer wall of described movable spool is provided with an annular tapered platform;

Described concentric laminated distributor also comprises joins vapour lock, and the described vapour lock of joining is connected with the upper end of described movable spool by screw thread;

Described shape of joining vapour lock outside axial cross section can be square-section, trapezoid cross section, fall a kind of in trapezoid cross section or the semiellipse type cross section.

In concrete application, described packer is separated at least two layer steam injection chambeies with the steam distribution in separate layer pit shaft, and is provided with a concentric laminated distributor in each layer steam injection chamber;

The top and bottom of the fixed valve body in the concentric laminated distributor of described each layer are connected with joint by screw thread respectively, and described joint is connected with steam injection string; Described vapor opening is arranged on the sidewall of fixed valve body;

The size of the movable spool in the concentric laminated distributor of described each layer and the latus rectum of this layer fixed valve body are suitable; Described movable valve core inside has a ventilation tubing string, and the outer ledge on described ventilation tubing string top is provided with external screw thread, and described external screw thread is used for and joins vapour lock and be connected; The outer wall of described movable spool is provided with an annular tapered platform, and the movable spool of described each layer is by the fixed valve body seat envelope of the tapered platform of this annular and this layer; The described square-section that is shaped as of joining vapour lock outside axial cross section.

In the concentric laminated distributor of the described bottom, the ventilation tubing string of described moving valve in-core is solid tubing string; And be provided with a fishing rod on described movable spool top, described fishing rod is used for described movable spool salvaged joins the vapour pit shaft.

In concrete application, the operating pressure in the described steam injection string: 10～25Mpa;

The length range of described each layer fixed valve body: 250～300mm; External diameter scope: 85～90mm; Inside diameter ranges: 40～55mm;

The length range of the movable spool of described each layer: 150～200mm; External diameter scope: 45～60mm; Inside diameter ranges: 38～45mm;

Described vapour lock internal diameter: the 10～30mm that joins; Join vapour lock flow-passing surface adjusting range: 0～1018mm ²

A kind of steam flooding steam distribution in separate layer method comprises oil well monitor metering units, oil well notes vapour data processing unit, steam distribution in separate layer unit in the method; Described oil well monitor metering units is annotated the vapour data processing unit with oil well and is connected, and steam injection parameter is transferred to oil well annotates the vapour data processing unit; Oil well is annotated the vapour data processing unit and is exported steam distribution in separate layer amount data to the steam distribution in separate layer unit, carries out oil well delamination and joins vapour;

Described steam flooding steam distribution in separate layer method comprises oil well monitor metrology steps, oil well notes vapour data processing step, implements steam distribution in separate layer step, zonal testing step and output step;

A, oil well monitor metrology steps: described oil well monitor metering units comprises four parameter measurement instruments, and each steam injection parameter of oil well is measured and detects, and promptly temperature, pressure, mass dryness fraction and steam injection rate is measured and detects;

B, oil well are annotated the vapour data processing step: described oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module;

The fluidised form judge module is judged the flow pattern of this position mixture earlier, and the data computation processing module is calculated liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and corresponding height successively according to different fluidised forms and steam injection parameter; Described oil well height iteration module is used for carrying out the height superposition from well head to the impact point of oil well, until the oil well impact point; Physical parameter and core intersection according to the stratum calculate the steam distribution in separate layer amount; Handle the parameters that draws by steam distribution in separate layer hole area setting module according to described data computation processing module and set and calculate the aperture area in each layer steam distribution in separate layer hole;

C, enforcement steam distribution in separate layer step: described steam distribution in separate layer unit comprises the steam distribution in separate layer device, steam distribution in separate layer process each layer that to be the steam distribution in separate layer device annotate the output of vapour data processing unit according to described oil well joined the area of joining steam vent that vapour amount and steam distribution in separate layer hole area calculated and set each layer laminated distributor, carries out layering vapour and drives assignment of traffic;

D, zonal testing step: described zonal testing unit comprises four parameter measurement instruments, is used for that each layer joined the vapour state and carries out zonal testing.

E, output step: be used for output well information, steam distribution in separate layer parameters data and join vapour effect analysis result.

In steps A oil well monitor metrology steps and step D zonal testing step, described oil well monitor metering units comprises that four parameter measurement instruments are respectively turbine flowmeter, mass dryness fraction gauge, pressure sensor and temperature pick up;

Described pressure sensor and temperature pick up detect and measure steam in the oil well respectively; The turbine flowmeter that is arranged on the gas phase output port is used for the gas phase data are carried out flow measurement; The turbine flowmeter that is arranged on the liquid phase output port is used for the flow of metering liquid; Each physical parameter after the metering is exported to oil well and is annotated the vapour data processing unit.

Described step B oil well is annotated the vapour data processing step and is comprised:

A, determine the initial calculation point:, be provided with and calculate starting point and calculated direction according to the position of monitoring and metering parameter extraction;

B, input steam injection parameter step: every physical data of importing the current oil reservoir of described oil well monitor metering units collection;

C, determining step: the fluidised form judge module calculates the accurate number of flow pattern discrimination according to the every physical parameter of current location of oil well monitor metering units output, judges the flow pattern of this position mixture according to the flow pattern discrimination criterion: separated flow, intermittent flow and dispersion train;

D, data processing step: calculate the vapour amount of joining of liquid holdup under the corresponding fluidised form in this position, on-way resistance coefficient, pressure drop, mass dryness fraction, destination layer and calculate the aperture area in each destination layer steam distribution in separate layer hole according to different judged results;

Wherein, the present invention during heterogeneous flow pressure drop, adopts Beggs Brill (Bei Gesibu Lille) method to carry out, comprising flow pattern discrimination, liquid holdup, on-way resistance coefficient and Calculation of Pressure Drop in calculate annotating the vapour pit shaft.

During the mass dryness fraction regularity of distribution of the present invention in calculating pit shaft, energy-balance equation is simplified under certain assumed condition, and the general solution that obtains the ODE of mass dryness fraction according to its fringe conditions is:

$x=e^b(-\frac{C_3}{C_2}{e}^k+x_0+\frac{C_3}{C_2})$

Wherein

$b=-\frac{C_2}{C_1}z;$ $k=\frac{C_2}{C_1}z.$

C ₁＝M(h _s-h _w+h _lg)

$C_2=M\left[\frac{\mathrm{dp}}{\mathrm{dz}}(\frac{{\mathrm{dh}}_s}{\mathrm{dp}}-\frac{{\mathrm{dh}}_w}{\mathrm{dp}})\right]$

$C_3=\frac{\mathrm{dQ}}{\mathrm{dz}}+M\left(\frac{\mathrm{dp}}{\mathrm{dz}}\right)\left(\frac{{\mathrm{dh}}_w}{\mathrm{dp}}\right)+\frac{M^3}{\left(A{\mathrm{\υ}}_m\right)}\frac{d(1/{\mathrm{\ρ}}_m)}{\mathrm{dz}}-\mathrm{Mg}$

In order to try to achieve C ₁, C ₂And C ₃, must provide h _wAnd h _sWith the relational expression of pressure, the present invention utilizes the computer interpolation to draw according to the water vapour table.In addition, dQ obtains according to the equation of heat conduction.

The present invention injects a certain stratum to steam and is reduced to radial fluid flow in the steam distribution in separate layer process.Suppose that the stratum is the horizontal circle plate-like, the homogeneous uniform thickness, permeability is k, and thickness is h, and circular boundary is a supply boundary, and its pressure is supply pressure p _e, radius is drainage radius R _e, the radius of well is R _w, bottom pressure is p _wUnder above-mentioned assumed condition, convection cell is followed Laplce's fundamental equation of steady seepage and is simplified in flow event, thereby has set up the Mathematical Modeling of steam distribution in separate layer amount.Promptly

$-q=\frac{2\mathrm{\πkh}}{\mathrm{\μ}}\frac{p_w-p_e}{\ln \frac{R_w}{R_e}}---\left(1\right)$

In planar radial seepage flow, the seepage velocity of each layer is $V_i=\frac{Q_i}{2\mathrm{\π}{h}_i}\frac{1}{r}$

In the formula

Q is for injecting the volume flow of fluid, m ³/ s; V _iBe the seepage velocity of every layer fluid, m/s; Q _iBe every layer of volume flow of injecting fluid, m ³/ s.

In the layer steam injection process, suppose that the speed of each layer is identical, think that promptly advance distance is also identical, promptly

$\frac{Q_1}{h_1}=\frac{Q_2}{h_2}=\mathrm{\Λ}$

According to continuity equation as can be known

Q _Always=∑ Q _i=∑ Ch _i=C ∑ h _i(3)

Simultaneous formula (2) and formula (3) can be tried to achieve the steam distribution in separate layer ratio of each layer.

The present invention is when the calculated hole diameters area, and it is mobile to suppose that gas-liquid two-phase fluid is done phase-splitting in joining steam vent, and liquid phase is an incompressible fluid, the flow coefficient C of gas-liquid two-phase _dIdentical, additional vaporization does not take place in flow process, the void fraction of gas phase is constant, and to flow through the pressure reduction of the pressure reduction of gas phase when joining steam vent and liquid phase simultaneously identical when two-phase, all equals two-phase fluid and flows through pressure differential deltap p when joining steam vent.According to energy equation and continuity equation formula, the design formulas that derives the orchestration hole area is

$A=\frac{G_{\mathrm{tp}}\sqrt{\stackrel{\‾}{\mathrm{\ρ}}}}{\sqrt{2{\mathrm{\ψ}}^2{C}_d^2{\mathrm{\ρ}}_l{\mathrm{\ρ}}_g(p-p_1)+G_{\mathrm{tp}}^2{\stackrel{\‾}{\mathrm{\ρ}}}^2/S^2}}$

Wherein

$\sqrt{\stackrel{\‾}{\mathrm{\ρ}}}=\mathrm{\ϵ}(1-x)\sqrt{{\mathrm{\ρ}}_g}+x\sqrt{{\mathrm{\ρ}}_l},$ Correction factor ε is that curvilinear regression is determined by experiment.

E, calculated height superposition step: calculated height is carried out superposition, promptly determine the original position height of next calculation level;

F, decision height step: after the stack of oil well height, judge whether the position height after the stack is highly consistent with down-hole target location point;

G, repeating step: if the position height of one deck repeats above-mentioned steps b-f less than down-hole target location point height down;

H, output step: if the position height of one deck exceeds down-hole target location point height down, then adopt interpolation method, obtain the relevant parameter of target location, every data that output steps d data are handled.

The invention effect

The present invention is different with utility model patent steam distribution in separate layer process pipe string (application number is 01220374.2):

(1) documents is developed at cyclic steam stimulation process.And technical scheme of the present invention is applied in the steam flooding operation stage.It belongs to different technology.

(2) simultaneously, documents can't realize the automatic adjusting of steam distribution in separate layer amount.According to its technical scheme, if will change the steam distribution in separate layer amount, then need a whole set of process pipe string integral body is taken out from the down-hole, regulate the steam distribution in separate layer mouth again.Loaded down with trivial details, the with high costs and long-time consumption oil recovery time of the salvaging step of a whole set of process pipe string.And technical scheme of the present invention can realize the convenient adjusting of steam distribution in separate layer amount, if will change the steam distribution in separate layer amount, only needs the distribution mouth is taken out from the down-hole.Very convenient quick.Cost reduces greatly, and the step of salvaging and throwing in is simple, and the time is short.

(3) in addition, structure and the method that does not have the down-hole to test constantly in this piece technical scheme.Because it can't change the distribution amount of regulating the distribution mouth with annotating the vapour amount, so it is not provided with the dynamic test structure and the method for laminated distributor under well.And the present invention need regulate the distribution mouth according to the required different notes vapour amount of each layer of down-hole, so be provided with test component and according to the testing procedure of test component design at each layer.

So no matter the present invention still all has the different of essence in technical scheme itself in design technology with this piece technical scheme, the invention solves the technical problem that steam flooding can't be realized that the distribution amount is conveniently regulated and detect constantly in the prior art.Reached good technical effect.

Certain oil field is a typical thick alternating layers shape oil reservoir, and after steam soak was for many years produced, the oil well major part had entered the high production phase in cycle.Along with the handle up increasing in cycle of oil well, block output obviously descends.Main cause is the influence that is subjected to reservoir physical property difference, causes each layer of oil well suction vapour inequality, and producing degree of reservoir is relatively poor.The effective means that addresses this problem just is to use the steam distribution in separate layer technology to improve the gas entry profile of oil well.

1. the layering principle of test well and join the vapour requirement

We have carried out the steam distribution in separate layer field trial.The basic data of this well sees Table 1, and this well has 8 oil reservoirs (reservoir physical property sees Table 2), and wherein 10,11,13,15,17, No. 18 six oil reservoirs are compared with 20, No. 21 following two oil reservoirs, and core intersection is bigger, and permeability is also higher.Therefore, annotate the vapour stage general, its vapor absorption capacity and producing degree of reservoir all are better than the latter, oil well behind the multicycle steam soak, the vertical development degree inequality of oil reservoir.For improving producing degree of reservoir, this well is carried out layer steam injection, adopted the steam distribution in separate layer technology, to adjust the steam entry profile of oil well, 20, No. 21 two oil reservoir steam absorbing amounts are increased.

Oil reservoir characteristics according to this well, 10,10,11,13,15,17, No. 18 oil reservoirs are divided into an oil reservoir group, 20, No. 21 oil reservoirs are divided into another oil reservoir group, the centre separates with the heating power packer, adopt concentric steam distribution in separate layer device to annotate the vapour unit to two and carry out injection allocation, it is 1800t that the vapour amount is annotated on design top, and it is 1200t that the vapour amount is annotated in the bottom, this well site operation, once success.

The basic data of table 1 test well

Table 2 test well reservoir physical property data

2. heat is annotated parameter

Test well steam injection parameter and conduction of heat parameter are as shown in table 3

Table 3 test well steam injection parameter

3. the pit shaft internal pressure regularity of distribution

Calculating pressure and observed pressure comparison diagram are as shown in Figure 7 in the pit shaft that draws according to the notes vapour operating mode of table 3.

4. section of reservoir pressure, flow dynamics curve

The section of reservoir pressure of measuring, flow distribution rule are as shown in Figure 8.

5. integrated interpretation result

(1) wellhead temperature is 277.50 ℃, and pressure is 5.72MPa, and the oil reservoir bottom temp is reduced to 249.20 ℃, and pressure is 4.21MPa, and two-layer suction vapour is all better.

(2) from steam entry profile, No. one oil reservoir group perforated interval is 980.5-1024.4m, bed thickness 24.6m, and the suction steam pressure is 4.35MPa, inhales vapour and reaches 61.13%, compares with another layer, a floor is positioned at the top of reservoir, so this layer inspiratory effects is better;

(3) No. two the oil reservoir perforated interval is 1029.5-1036.7m, bed thickness 4.8m, and the suction steam pressure is 4.21MPa, inhales vapour and reaches 38.87%, this layer inspiratory effects is better;

6. steam section

That table 4 is represented is actual measurement steam entry profile and the result who designs steam entry profile.Its comparison diagram sees 9.

Table 4 design and actual measurement gas entry profile contrast table

7. effect of increasing production analysis

The present steam distribution in separate layer of test well and the general vapour phase ratio of annotating of the 8th cycle, average daily incremental oil production 8.5t, the about 1539t of accumulative total incremental oil production; Annotate the vapour phase ratio with the 9th cycle separate zone whole production, average daily incremental oil production 6.3t, the about 1021t of accumulative total incremental oil production; From the oil well production situation, reached adjustment oil well steam entry profile, improve the purpose of producing degree of reservoir.

Description of drawings:

Fig. 1 is the principle schematic that vapour is annotated in the down-hole in the prior art;

Fig. 2 is the system schematic of steam flooding steam distribution in separate layer of the present invention system;

Fig. 3 is the schematic diagram of oil well monitor metering units among the present invention;

Fig. 4-A joins vapour lock 11 generalized sections in the structural representation of spool of eccentric steam distribution in separate layer device and the spool;

Fig. 4-B is the structural representation of joining the vapour seating nipple of eccentric steam distribution in separate layer valve;

Fig. 5-A is the structural representation of the concentric laminated distributor of I and II of concentric steam distribution in separate layer device for steam distribution in separate layer device among the present invention;

The steam distribution in separate layer device is the structural representation of three grades of concentric laminated distributors of concentric steam distribution in separate layer device among Fig. 5-B the present invention;

The steam distribution in separate layer device is the structural representation of the concentric steam distribution in separate layer pit shaft of concentric steam distribution in separate layer device among Fig. 5-C the present invention;

Fig. 6 is the flow process of steam flooding steam distribution in separate layer method of the present invention;

Fig. 7 is calculating pressure and a measured curve schematic diagram in the pit shaft;

Fig. 8 is actual measurement section of reservoir pressure, flow schematic diagram;

Fig. 9 is a test well gas entry profile schematic diagram.

Above accompanying drawing will specifically be illustrated in conjunction with the following specific embodiment.

The specific embodiment:

Fig. 1 is the principle schematic that vapour is annotated in the down-hole in the prior art.

The phenomenon that causes individual layer to be advanced by leaps and bounds for the steamed well steam overlap that Fig. 1 is represented.Cyclic steam stimulation method has become the major technique of heavy oil development at present.But China has dropped into the most heavy crude reservoirs and the block of steam soak exploitation, enters the middle and later periods, and promptly the steam soak cycle is in 5 weeks more than it.Even have many oil reservoirs or block to take to beat infill well, proceed the steam incoming and outcoming exploitation, but the productive life of continuity be limited.After many rounds steam incoming and outcoming, the steam driving exploitation mode must be changed over to, recovery ratio could be effectively improved.Recent years, the result of the test of more than ten the steam flooding pilot test project that process all kinds oil reservoir is opened up has confirmed that it is successful technically, economically that heavy crude reservoir adopts the steam drive development mode.The steam flooding injection modes that adopt general steam injection were promptly annotated vapour (Michael Prats 1982) to several straticulate explorations simultaneously in the past.But, because the strata pressure of each series of strata, permeability, crude oil property etc. there are differences, make interlayer annotate vapour amount unreasonable distribution sometimes, even the steam zone that certain layer position occur sharply advance, do not reach the notes vapour effect of expection.For the multilayer heavy crude reservoir, because each layer physical properties of rock there are differences, and closing in the initial stage recovery process annotated to close and adopted, cause each layer development degree inequality, aggravated steam overlap and individual layer is advanced by leaps and bounds, the vertical sweep efficiency of injection mode of the general steam injections of adopting of steam flooding is in the past reduced more, influenced exploitation effect.

Fig. 2 is the system schematic of steam flooding steam distribution in separate layer of the present invention system.

Be a kind of steam flooding steam distribution in separate layer of the present invention system shown in the figure, comprise oil well monitor metering units, oil well notes vapour data processing unit, steam distribution in separate layer unit, show output unit and zonal testing unit.

Described oil well monitor metering units is annotated the vapour data processing unit with oil well respectively with the zonal testing unit and is connected, and respectively steam injection parameter is transferred to oil well and annotates the vapour data processing unit; Oil well is annotated the vapour data processing unit and is exported steam distribution in separate layer amount data to the steam distribution in separate layer unit, carries out oil well delamination and joins vapour.Oil well notes vapour data processing unit is connected well information, every steam injection parameter and annotates the vapour result and exported with the demonstration output unit.

Wherein the oil well monitor metering units is used for each steam injection parameter of oil well is measured and detects;

Described oil well is annotated the vapour data processing unit and is used to utilize every steam injection parameter to carry out the data processing of pressure drop, mass dryness fraction and steam distribution in separate layer amount; Described oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module; Described fluidised form judge module is used to judge the flow pattern of this layer mixture; Described data computation processing module comprises liquid holdup calculating section, on-way resistance coefficient calculations part, pressure drop calculating section, mass dryness fraction calculating section and steam distribution in separate layer amount calculating section; The data computation processing module is carried out the calculating of liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and steam distribution in separate layer amount successively to steam injection parameter according to different fluidised forms.

Described steam distribution in separate layer unit comprises the steam distribution in separate layer device, described steam distribution in separate layer device joins the vapour amount according to each layer of described oil well notes vapour data processing unit output and each layer joined the steam vent area, be provided with and regulate the area in each layer steam distribution in separate layer hole, carry out layering vapour and drive assignment of traffic;

Described zonal testing unit is used for zonal testing is dynamically carried out in the production that each layer joined behind the vapour.

Also comprise the demonstration output unit in the described steam flooding steam distribution in separate layer system, described demonstration output unit is used for well information, every steam injection parameter and annotates vapour result output.

Fig. 3 is the schematic diagram of oil well monitor metering units among the present invention.

Described pressure sensor and temperature pick up detect and measure steam in the oil well respectively; The present invention is that heterogeneous separate measurement instrument is measured well head notes vapour situation the well head employing.Moist steam is at first carried out vapor-liquid separation in eliminator, the pressure sensor, temperature pick up and the turbine flowmeter that are arranged on eliminator vapour phase output port write down pressure, temperature and the flow of vapour phase respectively; The turbine flowmeter that is arranged on the separator liquid phase output port is used for the flow of metering liquid; After vapour, liquid phase are measured respectively, by driving nozzle, two-phase is fully mixed, the pressure sensor, the temperature pick up that are arranged on the mixture output are used to measure pressure, the temperature of steam in jection.Use a computer and gather parameters automatically, the line data of going forward side by side is handled and conversion, according to the definition of mass dryness fraction and steam injection rate, utilizes above-mentioned testing result to calculate, and just can obtain temperature, pressure, mass dryness fraction and the steam injection rate of well head.

Fig. 4-A joins vapour lock 111 generalized sections in the structural representation of spool of eccentric steam distribution in separate layer device and the spool;

Described eccentric steam distribution in separate layer valve core includes fishing head 101, spool main body 108, steam inleting vent 110, join vapour lock 111, vapor opening 113, align 114, pressure cap 102, cushion rubber 103,109,115, stage clip 104, torsion spring 105, axle 106 and cam 107.

The fishing head 101 of described eccentric steam distribution in separate layer valve core locks by snap close and spool main body 108, and compresses by pressure cap 102; Pressure cap 102 links to each other with spool main body 108 threadably by cushion rubber 103, is provided with stage clip 104 between pressure cap 102 and the fishing head 101, and torsion spring 105 is fixed on the spool main body 108 by axle 106, and cam 107 assemblies are in the outside of torsion spring 105; Described blowhole 110 and vapor opening 113 are arranged on the described spool main body 108; Join vapour lock 111 and be installed in the bottom of spool main body 108, align 114 with spool main body 108 by being threaded, and compress and join vapour lock 111.

The vapour lock 111 of joining in described eccentric steam distribution in separate layer valve core is joined vapour lock for the Laval nozzle type.

Fig. 4-B is the structural representation of joining the vapour seating nipple of eccentric steam distribution in separate layer valve;

The described vapour seating nipple of joining includes top connection 121, joins vapour blanking plug cover for seat tube 125, admission opening 127, vapor opening 128, lower contact 136, seating nipple main body 137, cushion rubber 122,126,129,134, connect sliding sleeve 123 on, connect sliding sleeve 130, support 132, guide way 135, screw 124 down, 131,133,138 and centralizer 139, and be provided with the reaming 140 of an evagination on the top of described steam distributing valve valve core case sleeve 125.

Described top connection 121 and lower contact 136 respectively threadably with join the vapour seating nipple on be connected sliding sleeve 123 with under be connected sliding sleeve 130 and be threaded, lower contact 136 is near guide way 135; The described vapour locking obturating plug sleeve 25 of joining is solidificated in the described seating nipple main body 137; Described admission opening 127 and vapor opening 128 are arranged on the described seating nipple main body 137; Described centralizer 139 is fixedlyed connected with seating nipple main body 137 by screw 124,138; Screw 131 is fixed on support 132 on the seating nipple main body 137.Screw 133 is fixed on guide way 135 in the distributor lower contact 136.

Described eccentric steam distribution in separate layer valve core is arranged on described the joining in the vapour blanking plug cover for seat tube 125 of vapour seating nipple of joining: eccentric steam distribution in separate layer valve core align 114 draw-in grooves that are provided with by its surface with join the vapour seating nipple join 125 clampings of vapour blanking plug cover for seat tube, adaptive with the position of admission opening 127 of joining the vapour seating nipple and vapor opening 128 respectively with steam inleting vent 110 and the vapor opening 113 of guaranteeing eccentric steam distribution in separate layer valve core; The outline of cam 107 supporting surfaces of described eccentric steam distribution in separate layer valve core is adaptive with the internal diameter of joining the reaming 140 in the vapour blanking plug cover for seat tube 125 of joining the vapour seating nipple.With guarantee when eccentric steam distribution in separate layer valve core is thrown in into join the vapour seating nipple after, the supporting surface of cam 7 is stuck in joins in the interior top reaming 140 of vapour blanking plug cover for seat tube 125.

Its operating principle is for when steam in jection, eccentric steam distribution in separate layer valve core sets in joining the joining in the vapour blanking plug cover for seat tube 125 of vapour seating nipple main body by the porcelain step of its spool main body 108, cam 107 is stuck in reaming 140 places of joining vapour blanking plug cover for seat tube 125 tops, (because of cam 107 under the effect of torsion spring 105, can make progress back rotation, so eccentric steam distribution in separate layer valve core can enter to join and be stuck in the vapour blanking plug cover for seat tube 125 joining of vapour seating nipple main body and do not fly out), eccentric steam distribution in separate layer valve core main body about in the of 108 two group of four road high temperature resistant cushion rubber of O type seal the vapor opening 128 of joining vapour blanking plug cover for seat tube 125, joining the admission opening 127 of vapour seating nipple and the steam inleting vent 110 of eccentric steam distribution in separate layer valve core aligns, the water vapour that injects enters through this admission opening, behind the orchestration mouth 111 of eccentric steam distribution in separate layer valve core, enter oil by the vapor opening 128 of joining the vapour seating nipple, inject the stratum behind the sleeve pipe annular space.Remaining gas flows to the next stage laminated distributor by joining the vapour seating nipple.

The launch process of described eccentric steam distribution in separate layer valve core is such: utilize the pulling head of throw in catcher that dropping feeder is installed, the fishing head 101 of steam distributing valve spool is inserted in the dropping feeder, the two connects with shear pin.Then with steel wire for logging with the throw in catcher G.I.H, by the guide way 135 of joining the vapour seating nipple eccentric steam distribution in separate layer valve core is lowered in the steam distributing valve valve core case sleeve 125 of seating nipple main body 137.On carry throw in catcher, the supporting surface of cam 107 is stuck in the top reaming 140 in the steam distributing valve valve core case sleeve 125.Shear pin is cut off as a result, and eccentric steam distribution in separate layer valve core stays in joining the vapour seating nipple, and throw in catcher is tripped out.

The salvaging process that eccentric layering vapour drives the steam distributing valve spool: salvaging is to adopt steel wire for logging, uses eccentric layering vapour to drive the steam distributing valve throw in catcher, and the pulling head of throw in catcher is installed fisher.Eccentric steam distribution in separate layer valve core is lowered in the steam distributing valve valve core case sleeve 125 of joining vapour seating nipple main body 137 by above-mentioned construction sequence then, when guide grab enters the breach of guide way 135, the pulling pawl has entered the elongated slot (top of screw 24) of joining vapour seating nipple centralizer 139, over against steam distributing valve spool head.Wait to transfer and be hampered, fisher has dragged for eccentric steam distribution in separate layer valve core fishing rod, carries throw in catcher on again.Eccentric steam distribution in separate layer valve core fishing rod compression press spring 104 is up, and the lower end is met cam 107 and disengaged, and cam 107 rotates and interior receipts under the effect of torsion spring 105, and eccentric steam distribution in separate layer valve core is pulled and play out ground.

Fig. 5-A is the structural representation of the concentric laminated distributor of I and II of concentric steam distribution in separate layer device for steam distribution in separate layer device among the present invention;

The steam distribution in separate layer device is the structural representation of three grades of concentric laminated distributors of concentric steam distribution in separate layer device among Fig. 5-B the present invention;

The steam distribution in separate layer device is the structural representation of the concentric steam distribution in separate layer pit shaft of concentric steam distribution in separate layer device among Fig. 5-C the present invention;

A kind of concentric steam distribution in separate layer device that is used for viscous crude layering steam flooding process, comprise the concentric steam distribution in separate layer pit shaft 201 of layering steam flooding, described steam distribution in separate layer pit shaft 201 comprises steam injection string 202, in described steam distribution in separate layer pit shaft 201, also include packer 203, described packer 203 is separated into three grades of layer steam injection chambeies with steam distribution in separate layer pit shaft 201, order according to from the well head to the shaft bottom is followed successively by one-level, secondary and three grades of layer steam injection chambeies; And be provided with a concentric laminated distributor 204 in each grade layer steam injection chamber, described concentric laminated distributor 204 comprises concentric steam distribution in separate layer valve fixed valve body 205 and movable spool 206.

Fig. 5-A is the structural representation of the concentric laminated distributor of I and II among the utility model embodiment.

In each layer steam injection chamber, be provided with a concentric laminated distributor 204; Laminated distributor 204 comprises concentric steam distribution in separate layer valve fixed valve body 205 and movable spool 206 with one heart.The top and bottom of the fixed valve body 205 in the concentric laminated distributor 204 of described each layer are connected with joint 213A, joint 213B by screw thread respectively, and described joint 213A, joint 213B are connected with steam injection string 202; Described vapor opening 207 is arranged on the sidewall of fixed valve body 205;

The size of the movable spool 206 in the concentric laminated distributor 204 of described each grade and the latus rectum of this grade fixed valve body 205 are suitable; There is a ventilation tubing string 208 described movable spool 206 inside, and the outer ledge on described ventilation tubing string 208 tops is provided with external screw thread 209, and described external screw thread 209 is used for and joins vapour lock 211 and be connected; The outer wall of described movable spool 206 is provided with an annular tapered platform 210, and the movable spool 206 of described each grade is by the tapered platform 210 of this annular 205 envelopes of fixed valve body with this layer; The described square-section that is shaped as of joining vapour lock 211 outside axial cross sections.

Fig. 5-B is the structural representation of three grades of concentric laminated distributors among the utility model embodiment.The notes vapour chamber that described three grades of layer steam injection chambeies are lowermost end in the steam distribution in separate layer pit shaft 201 wherein is provided with a concentric laminated distributor 204.Laminated distributor 204 comprises concentric steam distribution in separate layer valve fixed valve body 205 and movable spool 206 with one heart.The top and bottom of fixed valve body 205 are connected with joint 213A, joint 213B by screw thread respectively, and described joint 213A, joint 213B are connected with steam injection string 202; Described vapor opening 207 is arranged on the sidewall of fixed valve body 205;

The latus rectum of the size of the movable spool 206 in the laminated distributor 204 and this grade fixed valve body 205 is suitable with one heart; The ventilation tubing string 208 of described movable spool 206 inside is solid tubing string.Outer ledge on described ventilation tubing string 208 tops is provided with external screw thread 209, and described external screw thread 209 is used for and joins vapour lock 211 and be connected; The outer wall of described movable spool 206 is provided with an annular tapered platform 210, and the movable spool 206 of described each grade is by annular tapered platform 210 205 envelopes of fixed valve body with this layer; The described square-section that is shaped as of joining vapour lock 211 outside axial cross sections.And be provided with a fishing rod 212 on described movable spool 206 tops, described fishing rod 212 is used for described movable spool 206 salvaged joins vapour pit shaft 201.

The expression underground three layer is annotated the structure of vapour among Fig. 5-C, wherein, the top and bottom of the fixed valve body 205 of the concentric laminated distributor 204 described in each layer steam injection chamber are connected with joint 213A, joint 213B by screw thread respectively, described joint 213A is a spigot, joint 213B is socket, and joint 213A is connected with steam injection string 202 respectively with joint 213B.The movable spool 206 of one deck and two layers is shown in Fig. 5-A, and three layers movable spool 206 is shown in Fig. 5-B.

And fixed valve body 205 length overalls of the concentric laminated distributor of first floor are 300mm, and maximum outside diameter is 88.9mm, and minimum latus rectum is 54mm; Movable spool 206 length overalls are 200mm, and maximum outside diameter is 58mm, and minimum latus rectum is 42mm, and minimum is joined vapour flow-passing surface adjusting range: 180---1018mm ²

Fixed valve body 205 length overalls of the concentric laminated distributor of the second layer are 300mm, and maximum outside diameter is 88.9mm, and minimum latus rectum is 48mm; Movable spool 206 length overalls are 200mm, and maximum outside diameter is 52mm, and minimum latus rectum is 42mm, and minimum is joined vapour flow-passing surface adjusting range: 150---1018mm ²

Fixed valve body 205 length overalls of the 3rd layer of concentric laminated distributor are 300mm, and maximum outside diameter is 88.9mm, and minimum latus rectum is 42mm, movable spool 206 length overalls are 200mm, maximum outside diameter is 46mm, and minimum latus rectum is 38mm, and minimum is joined vapour flow-passing surface adjusting range: 150---1500mm ²

With one heart steam distribution in separate layer Unit Installation process is: the installation of down-hole fixed valve body: fixed valve body 205 is by joint 213A, joint 213B and the design attitude of together going into the well after steam injection string 202 is connected.Fixed valve body is the standing part of concentric steam distribution in separate layer device, during steam flooding, can not realize changing, and also the fixed valve body difference of each layer position correspondence, must be linked in sequence, can not put upside down.

The installation of movable spool: movable spool 206 is to realize adjusting the movable part of joining vapour, and different steam injection strings connect, and only cooperates with fixed valve body 205, can realize that the later stage throws in and salvaging is adjusted and changed.And with the movable spool 206 that each layer position fixed valve body 205 matches is corresponding one by one, and order must not be put upside down.

The input of movable spool 206: movable spool is taked directly to throw in from well head.Can throw in (movable spool is placed on the undermost movable spool from the order stack from down to up on lower floor to upper strata) together by several groups of activity spools during input, every like this fixed valve body 205 just has corresponding movable spool 206 and is retained down cooperation with it, constitutes complete concentric laminated distributor.Certainly also can throw in separately, its release sequence also is from down to up, throws the bottom earlier, upwards throws in step by step successively.

The salvaging of movable spool: the salvaging of movable spool 206 adopts steel wire for logging to salvage, and uses concentric layering vapour to drive the steam distributing valve throw in catcher, and the pulling head of throw in catcher is installed fishing head.Wherein the throw in catcher length overall is 300mm, and the throw in catcher maximum outside diameter is 35mm.Throw in catcher is transferred to the orlop position, its fishing head is played the fishing rod 212 and the locking of dragging for the movable spool of orlop, carry concentric layering vapour again and drive the steam distributing valve throw in catcher, promptly salvage this moment and played the movable spool of orlop, carry in the process in the continuation, cooperate with the diameter of the movable spool 206 in upper strata by the movable spool fishing rod 212 of orlop, with the moving valve core retainer plate top loading of each layer position, top, once can salvage whole show spool 206 step by step.

This device can be realized multilevel hierarchy notes vapour, and be implemented in the steam flooding process and each layer notes vapour amount adjusted arbitrarily according to actual conditions, Zhuan Zhi structure has satisfied again when carrying out the zonal testing of steam flooding simultaneously, can easily and efficiently testing tool be arranged on the steam distribution in separate layer device in precalculated position.

Fig. 6 is the flow chart of steam flooding steam distribution in separate layer method of the present invention.

Described steam flooding steam distribution in separate layer method comprises oil well monitor metrology steps, oil well notes vapour data processing step, implements steam distribution in separate layer step, zonal testing step and output step;

A, oil well monitor metrology steps: described oil well monitor metering units comprises four parameter measurement instruments, and each steam injection parameter of oil well is measured and detects, and promptly temperature, pressure, mass dryness fraction and steam injection rate is measured and detects;

B, oil well are annotated the vapour data processing step: described oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module;

The fluidised form judge module is judged the flow pattern of this oil reservoir mixture earlier, and the data computation processing module is calculated liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and corresponding height successively according to different fluidised forms and steam injection parameter; Described oil well height iteration module is used for carrying out the height superposition from the well head of oil well to impact point, and the oil well monitor metering units extracts the steam injection parameter of each layer of oil well in proper order, so that each layer carried out fluidised form judgement and data computation processing, until the oil well impact point; Physical parameter and core intersection according to the stratum calculate the steam distribution in separate layer amount; Handle the parameters that draws by steam distribution in separate layer hole area setting module according to described data computation processing module and set and calculate the aperture area in each layer steam distribution in separate layer hole;

C, enforcement steam distribution in separate layer step: described steam distribution in separate layer unit comprises the steam distribution in separate layer device, steam distribution in separate layer process each layer that to be the steam distribution in separate layer device annotate the output of vapour data processing unit according to described oil well joined the area of joining steam vent that vapour amount and steam distribution in separate layer hole area calculated and set each layer laminated distributor, carries out layering vapour and drives assignment of traffic;

D, zonal testing step: described zonal testing unit comprises four parameter measurement instruments, is used for that each layer joined the vapour state and carries out zonal testing.

E, output step: be used for output well information, steam distribution in separate layer parameters data and join vapour effect analysis result.

In steps A oil well monitor metrology steps and step D zonal testing step, described oil well monitor metering units comprises that four parameter measurement instruments are respectively turbine flowmeter, mass dryness fraction gauge, pressure sensor and temperature pick up;

Described pressure sensor and temperature pick up detect and measure steam in the oil well respectively; The turbine flowmeter that is arranged on the gas phase output port is used for the gas phase data are carried out flow measurement; The turbine flowmeter that is arranged on the liquid phase output port is used for the flow of metering liquid; Each physical parameter after the metering is exported to oil well and is annotated the vapour data processing unit.

Described step B oil well is annotated the vapour data processing step and is comprised:

A, determine the initial calculation point:, be provided with and calculate starting point and calculated direction according to the position of monitoring and metering parameter extraction;

B, input steam injection parameter step: every physical data of importing the current oil reservoir of described oil well monitor metering units collection;

C, determining step: the fluidised form judge module is judged the flow pattern of this position mixture according to the every physical parameter of current location of oil well monitor metering units output: separated flow, intermittent flow and dispersion train;

D, data processing step: calculate the vapour amount of joining of liquid holdup under the corresponding fluidised form in this position, on-way resistance coefficient, pressure drop, mass dryness fraction, destination layer and calculate the aperture area in each destination layer steam distribution in separate layer hole according to different judged results;

E, calculated height superposition step: calculated height is carried out superposition, promptly determine the original position height of next calculation level;

F, decision height step: after the stack of oil well height, judge whether the position height after the stack is highly consistent with down-hole target location point;

G, repeating step: if the position height of one deck repeats above-mentioned steps b-f less than down-hole target location point height down;

H, output step: if the position height of one deck exceeds down-hole target location point height down, then adopt interpolation method, obtain the relevant parameter of target location, every data that output steps d data are handled.

Claims (8)

1, a kind of steam flooding steam distribution in separate layer system comprises that oil well monitor metering units, oil well annotate vapour data processing unit and steam distribution in separate layer unit; Described oil well monitor metering units is annotated the vapour data processing unit with oil well and is connected, and steam injection parameter is transferred to oil well annotates the vapour data processing unit; Oil well is annotated the vapour data processing unit and is connected with the steam distribution in separate layer unit;

It is characterized in that: described oil well is annotated the vapour data processing unit and is used to utilize every steam injection parameter to carry out the data processing of pressure drop, mass dryness fraction and steam distribution in separate layer amount, exports steam distribution in separate layer amount data to the steam distribution in separate layer unit, carries out oil well delamination and joins vapour; Described steam distribution in separate layer unit comprises the steam distribution in separate layer device, described steam distribution in separate layer device joins the vapour amount according to each layer of described oil well notes vapour data processing unit output and each layer joined the steam vent area, be provided with and regulate the area in each layer steam distribution in separate layer hole, carry out layering vapour and drive assignment of traffic;

Described steam flooding steam distribution in separate layer system also comprises the zonal testing unit, and described zonal testing unit is used for zonal testing is dynamically carried out in the production that each layer joined behind the vapour, and test data is transmitted back described oil well annotates the vapour data processing unit and carry out data and handle.

2, a kind of steam flooding steam distribution in separate layer according to claim 1 system is characterized in that:

Described oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module;

Described fluidised form judge module is used to judge the flow pattern of this layer mixture;

Described data computation processing module comprises liquid holdup calculating section, on-way resistance coefficient calculations part, pressure drop calculating section, mass dryness fraction calculating section and steam distribution in separate layer amount calculating section; The data computation processing module is carried out the calculating of liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and steam distribution in separate layer amount successively to steam injection parameter according to different fluidised forms;

Described oil well height iteration module is used for carrying out the height superposition from the well head of oil well to impact point, and the oil well monitor metering units extracts the steam injection parameter of each layer of oil well in proper order, so that annotate monitoring of steam-operating attitude and data computation processing;

Described steam distribution in separate layer hole area setting module is handled the aperture area that each layer steam distribution in separate layer hole was calculated and set to the parameters that draws according to described data computation processing module.

3, a kind of steam flooding steam distribution in separate layer according to claim 1 and 2 system is characterized in that:

Described steam distribution in separate layer unit comprises the steam distribution in separate layer device, and described steam distribution in separate layer device is eccentric steam distribution in separate layer device; It comprises the eccentric steam distribution in separate layer pit shaft of layering steam flooding, and described steam distribution in separate layer pit shaft comprises a steam injection string, it is characterized in that: also include packer in described steam injection string, described packer is separated into a component layers with steam injection string and annotates the vapour chamber; And in each layer steam injection chamber, be provided with an eccentric laminated distributor;

Described eccentric laminated distributor comprises eccentric steam distribution in separate layer valve core and joins the vapour seating nipple:

Described eccentric steam distribution in separate layer valve core includes fishing head (101), spool main body (108), steam inleting vent (110), joins vapour lock (111), vapor opening (113) and aligns head (114); The fishing head of described eccentric steam distribution in separate layer valve core (101) is by snap close and spool main body (108) locking; Described blowhole (110) and vapor opening (113) are arranged on the described spool main body (108); Join vapour lock (111) assembly in the bottom of spool main body (108), align head (114) and be threaded, and compress and join vapour lock (111) with spool main body (108);

Describedly join that the vapour seating nipple includes top connection (121), joins vapour blanking plug cover for seat tube (125), admission opening (127), vapor opening (128), lower contact (136) and seating nipple main body (137); Described top connection (121) of joining the vapour seating nipple is connected with the two ends up and down of joining the vapour seating nipple respectively threadably with lower contact (136); The described vapour locking obturating plug sleeve (125) of joining is fixed in the described seating nipple main body (137); Described admission opening (127) and vapor opening (128) are arranged on the described seating nipple main body (137);

Described eccentric steam distribution in separate layer valve core is arranged on described the joining in the vapour blanking plug cover for seat tube (125) of vapour seating nipple of joining, and the steam inleting vent of eccentric steam distribution in separate layer valve core (110) and vapor opening (113) are adaptive with admission opening of joining the vapour seating nipple (127) and vapor opening (128) respectively.

4, a kind of steam flooding steam distribution in separate layer according to claim 1 and 2 system is characterized in that:

Described steam distribution in separate layer unit comprises the steam distribution in separate layer device, described steam distribution in separate layer device is concentric steam distribution in separate layer device, it comprises the concentric steam distribution in separate layer pit shaft of layering steam flooding (201), described steam distribution in separate layer pit shaft (201) comprises steam injection string (202) and packer (203), and described packer (203) is separated into a component layers with steam distribution in separate layer pit shaft (201) and annotates the vapour chamber; And in each layer steam injection chamber, be provided with a concentric laminated distributor (204);

Described concentric laminated distributor (204) comprises concentric steam distribution in separate layer valve fixed valve body (205) and movable spool (206); Described fixed valve body (205) sidewall is provided with a vapor opening (207); There is a ventilation tubing string (208) described movable spool (206) inside, and the outer ledge on described ventilation tubing string (208) top is provided with external screw thread (209); The outer wall of described movable spool (206) is provided with an annular tapered platform (210);

Described concentric laminated distributor (204) also comprises joins vapour lock (211), and the described vapour lock (211) of joining is connected with the upper end of described movable spool (206) by screw thread (209);

Described shape of joining vapour lock (211) outside axial cross section can be square-section, trapezoid cross section, fall a kind of in trapezoid cross section or the semiellipse type cross section.

5, a kind of steam flooding steam distribution in separate layer according to claim 1 and 2 system is characterized in that:

Described zonal testing comprises four parameter measurement instruments in the unit, is used for that each layer joined the vapour parameter and tests and detect;

Described oil well monitor metering units is used for the oil well steam injection parameter is detected and measures, and comprises four parameter measurement instruments in the described oil well monitor metering units, and temperature, pressure, mass dryness fraction and steam injection rate parameter are detected and measure; Described four parameter measurement instruments are respectively turbine flowmeter, mass dryness fraction gauge, pressure sensor and temperature pick up;

Also comprise the demonstration output unit in the described steam flooding steam distribution in separate layer system, described demonstration output unit is used for well information, every steam injection parameter and annotates vapour result output.

6, a kind of steam flooding steam distribution in separate layer method of using as the described steam flooding steam distribution in separate layer of one of claim 1-5 system,

It is characterized in that:

Described steam flooding steam distribution in separate layer method comprises oil well monitor metrology steps, oil well notes vapour data processing step, implements steam distribution in separate layer step, zonal testing step and output step;

A, oil well monitor metrology steps: described oil well monitor metering units comprises four parameter measurement instruments, and each steam injection parameter of oil well is measured and detects, and promptly temperature, pressure, mass dryness fraction and steam injection rate is measured and detects;

B, oil well are annotated the vapour data processing step: described oil well is annotated the vapour data processing unit and is comprised fluidised form judge module, data computation processing module, oil well height iteration module and steam distribution in separate layer hole area setting module;

The fluidised form judge module is judged the flow pattern of current location mixture earlier, and the data computation processing module is calculated liquid holdup, on-way resistance coefficient, pressure drop, mass dryness fraction and corresponding height successively according to different fluidised forms and steam injection parameter; Described oil well height iteration module is used for carrying out the height superposition from the well head of oil well to impact point, and the oil well monitor metering units extracts the steam injection parameter of each layer of oil well in proper order, so that each layer annotated monitoring of steam-operating attitude and data computation processing, until the oil well impact point; Physical parameter and core intersection according to the stratum calculate the steam distribution in separate layer amount; Handle the parameters that draws by steam distribution in separate layer hole area setting module according to described data computation processing module and set and calculate the aperture area in each layer steam distribution in separate layer hole;

C, enforcement steam distribution in separate layer step: described steam distribution in separate layer unit comprises the steam distribution in separate layer device, steam distribution in separate layer process each layer that to be the steam distribution in separate layer device annotate the output of vapour data processing unit according to described oil well joined the area of joining steam vent that vapour amount and steam distribution in separate layer hole area calculated and set each layer laminated distributor, carries out layering vapour and drives assignment of traffic;

D, zonal testing step: described zonal testing unit comprises four parameter measurement instruments, is used for zonal testing is dynamically carried out in the production that each layer joined behind the vapour, and passes test data back oil well and annotate the vapour data processing unit;

E, output step: be used for output well information, steam distribution in separate layer parameters data and join vapour effect analysis result.

7, a kind of steam flooding steam distribution in separate layer method according to claim 6 is characterized in that:

In steps A oil well monitor metrology steps and step D zonal testing step, described oil well monitor metering units comprises that four parameter measurement instruments are respectively turbine flowmeter, mass dryness fraction gauge, pressure sensor and temperature pick up;

Described pressure sensor and temperature pick up detect and measure steam in the oil well respectively; The turbine flowmeter that is arranged on the gas phase output port is used for the gas phase data are carried out flow measurement; The turbine flowmeter that is arranged on the liquid phase output port is used for the flow of metering liquid; Each physical parameter after the metering is exported to oil well and is annotated the vapour data processing unit.

8, a kind of steam flooding steam distribution in separate layer method according to claim 6 is characterized in that:

Described step B oil well is annotated the vapour data processing step and is comprised:

A, determine the initial calculation point:, be provided with and calculate starting point and calculated direction according to the position of monitoring and metering parameter extraction;

B, input steam injection parameter step: every physical data of importing the current location of described oil well monitor metering units collection;

C, determining step: the fluidised form judge module calculates the accurate number of flow pattern discrimination according to the every physical parameter of current location of oil well monitor metering units output, judges the flow pattern of this position mixture according to the flow pattern discrimination criterion: separated flow, intermittent flow and dispersion train;

D, data processing step: calculate the vapour amount of joining of liquid holdup under the corresponding fluidised form in this position, on-way resistance coefficient, pressure drop, mass dryness fraction, destination layer and calculate the aperture area in each destination layer steam distribution in separate layer hole according to different judged results;

E, calculated height superposition step: calculated height is carried out superposition, promptly determine the original position height of next calculation level;

F, decision height step: after the stack of oil well height, judge whether the position height after the stack is highly consistent with down-hole target location point;

G, repeating step: if the position height of one deck repeats above-mentioned steps b-f less than down-hole target location point height down;

H, output step: if the position height of one deck exceeds down-hole target location point height down, then adopt interpolation method, obtain the relevant parameter of target location, every data that output steps d data are handled.

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