CN1216806C

CN1216806C - Water treatment method for heat recovering heavy oil

Info

Publication number: CN1216806C
Application number: CN01117933.3A
Authority: CN
Inventors: 史蒂夫·克雷森亚克; 亚力克斯·布朗
Original assignee: Because Calnet; Aqua Pure Ventures Inc
Current assignee: Because Calnet; Aqua Pure Ventures Inc
Priority date: 2000-05-03
Filing date: 2001-05-08
Publication date: 2005-08-31
Anticipated expiration: 2021-05-08
Also published as: GB0110883D0; CN1358671A; MXPA01004446A; AU5187501A; GB2362333B; EG23046A; GB2362333A

Abstract

There is disclosed a method and apparatus for treating produced water from a heavy oil thermal recovery unit to achieve water recovery and recycle levels of greater than 80% and as high as 100% to achieve zero discharge criteria. The method includes the initial steps of capturing the waste heat energy from the high pressure steam separator located downstream of the steam generators. Further, transferring the heat energy into a heated separator and reboiler exchanger to distill oil reservo ir produced water and recover distilled water and a concentrated brine or solid product. The heated separator concentrated stream is circulated through the reboiler exchanger t o maintain from 1 % to about 50% mass vapour in the stream returning to the heated separator and prevent fouling and scaling. A further embodiment unifies the antifouling methodology with SAGD type heavy oil recovery. In another embodiment, a crystallizer is augmented to the circuit for further advantages.

Description

The water treatment method that is used for the heavy oil recovery of heat

The present invention relates to a kind of efficient water distillating method and equipment, more particularly, the present invention relates to a kind of efficient water distillating method that is used for the heavy oil recovery of heat, make and in the prolonged operation of equipment, stop up and the fouling minimum.

Many areas in the world, heavy oil---kind viscosity ratio conventional crude is much higher or api gravity is much lower (is lower than 20 ° of API, be generally 7 ° of-12 ° of API) the hydrocarbon material, more be difficult to reclaim, need use enhanced thermal excitation (thermal stimulation) technology to produce underground oil bearing reservoir.Specifically, in the Canada West area, the heavy oil manufacturer uses to the reservoir injection pressure to about 1,500-3, and 000psig is low to moderate the technology of the high pressure steam of 150psig under some situation.Steam thermal energy is produced by known steam generator device, and steam parameter is 60-80%, and steam is injected into horizontal or vertical well equipment to reduce the viscosity of heavy oil.Flowable heavy oil is collected in the adjacent production well, and the brackish water of heavy oil, oil/water-in-oil emulsion, condensed steam and formation (brackish water) (be known as and produce water) is produced to the face of land.Use landscape apparatus, with the fluid separation of heavy oil and production process and recovery to sell in market.In water/oil ratio rate is that the production water (produced water) that reclaims under the 2-5 is discharged in the underground disposal well (disposal well) usually.Make up water from special permission (authorized) underground water source is used for replenishing the required water of vapour generator charging.Usually make up water through minimum processing with the content that reduces hardness and silicon oxide compounds to avoid the fouling of vapour generator heat exchange surface in case the hidden danger of secure context.In some equipment, the concentrated salt solution of discharging from vapour generator separates with the oil bearing reservoir injecting steam, and is discharged in the suitable depths reason well.This concentrated salt solution can be thought high pressure blowdown (blowdown).Having prevented like this that steam from exciting in the operation is injected into excessive unnecessary hot water in the oil bearing reservoir.The popular heavy oil recovery practice of use steam shooting techniques is referred to as cyclic steam and excites method (Cyclic Steam Stimulation, CCS or Huffn ' are Puff) and steam assisted gravity oil extraction (Steam Assisted Gravity Drained, SAGD) method.

The pressure of the public and rules requires the heavy oil manufacturer to realize the water recovery and reuse, requires to accomplish the zero release of sewage in some equipment.This means employed water 100% ground recovery and reuse, and the equipment of elimination sewage discharges outward.The production water that reclaims from separating of oil equipment and HP (high pressure) vapour generator contains the silicon oxide and the gelatinize compound (clay) of hardness components, dissolving and suspension, and as the dissolved solids of sodium-chlor.If the not treated just circulation of these brackish waters, owing to stop up and fouling, the operation of vapour generator is dangerous.

At present, using the steam injection method to reclaim another problem that runs in the heavy oil process is to surpass 400 °F to improve the rate of recovery of heavy oil because the service temperature of production oil bearing reservoir is elevated to from 230 °F, and the temperature of the production fluid (You Heshui) of recovery also raises.In order to realize normal pressure oily water separation, when reducing, pressure produced a large amount of steam.These steam come condensation by external device (ED) usually, as air-cooler to reclaim water of condensation.The heat energy of condensed steam has been discharged into atmosphere, has been wasted.

Before combining of appearance high efficiente callback waste thermal energy of the present invention and no dirty water still-process occurred, water produced by circulation heavy oil and concentrated brine treatment logistics is subjected to technology and industrial restriction always.

In general, also reclaim concentrated liquid or the solid that contains a large amount of non-volatilization components for the evaporation pure water, the water distillation is a kind of high efficiency method.This method is a kind of effective means to reclaiming pure water from polluted source.Yet there are several problems in the water distillating method, and in these problems, the mineral substance or other component that are distilled at least in the fluid may be stopped up or fouling by equipment.Usually scale-forming compound is made up of calcium, magnesium and silicon.A large amount of foulings of obstruction or heating surface have disadvantageous effect to the ability of heat transfer element, and traditional still-process can not be operated.

In the prior art, at US 4, Tsuruta has proposed a kind of distillating method in 566,947 (announcements on January 28th, 1986), but does not recognize and need prevent the key factor stopped up or the applicability aspect the production water of this method in handling the heavy oil removal process.On most important the 7th hurdle of Tsuruta patent, carried out following description in conjunction with the accompanying drawings since the 55th row:

" when because the condensation of volatile constituent; the gelling that produces solid precipitation or the bituminous matter material takes place is known from experience in incoming flow; thus cause that security incident maybe needs compressor is carried out the maintenance of trouble and when safeguarding, it is favourable having used this method of vapour compressor 307 by this way.Use above-mentioned setting, have only the steam of flash-pot 307, therefore, prevent the generation of this trouble.By using suitable washing device, pipeline 350 and reboiler 352 inside can remain on clean state.Particularly when tower still fluid was water, preceding method was favourable, because can replenish the process water of the cheapness that needn't reclaim by pipeline 353.When the water of collecting at 306 tower still does not contain the material that stops up in the compressor 307, can be constant with the liquid level that keeps vaporizer by pipeline 353 inputs." (adding after emphasizing)

Fig. 4 of Tsuruta patent is replicated among Figure 18 A of this Figure of description, is replicated in corresponding to the amended Fig. 4 of Fig. 4 of Tsuruta patent among Figure 18 B of this Figure of description, has introduced in applicant's the equipment to implement its method.

When applicant's equipment covers on the synoptic diagram of Tsuruta, from Fig. 4 of Tsuruta patent with can obviously find out, if add among the US ' 947 in the forced circulating reboiler loop, and limit concrete quantity of steam, tower bottoms body water may contain the obstruction material, can operate under the state that does not have obstruction or heating surface non-scaling.

In Fig. 4 of Tsuruta patent, pipeline 340 does not link to each other with 353.Be not connected between tower still 306 and the pipeline 353.306 parts are defined as the tower still in the tower, contain the tower bottoms body, have predetermined ammonia concentration.Tsuruta emphasizes that when the tower bottoms body was water, this method was favourable.These figure are suggestion or qualification tower still round-robin state not.

The Tsuruta patent lacks the evidence of practicality and can find out from Fig. 1 of this patent.

In the disclosure, logistics 34 and 35 just arrives in the 3rd hurdle, the 19th to 23 row prevailingly.The tower bottoms body of tower 1 is transported to reboiler through pipeline 34, and the tower bottoms body of heating flows through pipeline 35.Furtherly, the 20th row points out that the tower bottoms body is heated owing to the heat of condensation of having accepted compressed vapour.After fully reading open file, as if never mention steam or vapour liq ratio.

The Tsuruta patent clearly illustrates that, mention in the above and the paragraph emphasized in, as long as the water that is collected in the tower still does not contain the obstruction material, water just can be transported in the vaporizer.The application does not relate to the character of the input logistics of stopping up vaporizer.The water that contaminated thing pollutes can be delivered directly in the vaporizer, and needn't worry to stop up or the infringement interchanger.In fact, just in time opposite with the instruction of Tsuruta.Consider the circulation loop of Fig. 4 in the Tsuruta patent, all heating surface that relate to the tower bottoms body in equipment never contact with other any material except that the water that is substantially free of the blocking pollution thing, and these water are as the main medium of separation of ammonia from the mixture of ammonia and water.The 3rd hurdle the 19th of Tsuruta patent row be describe like this " ... the liquid in the tower 1 tower still is transported to reboiler 8 through pipeline 34; therein; because acceptance is heated from the heat of condensation of the compressed vapour of compressor 7, heated tower bottoms body is recycled to tower still 6 through pipeline 35.”

If in conjunction with the instruction from the 7th hurdle and the 3rd hurdle, unique result is that equipment is with blocked.By instructing in conjunction with these, the information that the Tsuruta patent proposes can only cause the obstruction of equipment.In contrast, the technology here provides a kind of system effectively, and it adopts load that the aqueous feed logistics of pollutent is arranged, and is transported in the equipment, at all needn't worry the obstruction of heat exchanger surface.

Consider ucleate boiling (nucleate boiling) and this physical phenomenon importance on the wetted surface in keeping the loop that comprises interchanger, this is possible.As everyone knows, for the water under the pond normal pressure, the ucleate boiling mode is quite specific zone, forms single isolated bubbles in this zone.This theory be based upon document Frank Kreith's " Principle of Heattransfer (heat transfer theory) ", the 3rd edition; With " Heat Transfer (heat transfer) " of J.P.Holman, in the 7th edition.

In the 498th page in document " heat transfer theory ", stabilizing membrane and ucleate boiling have been discussed.In this page or leaf, Figure 10-2 has described ucleate boiling.Clearly, on the net shown in this figure (wire), formed single isolated bubbles.This phenomenon also is described among Fig. 9-5 of the 520th page in second piece of document " heat transfer ".In the document, in fact the author admits to exist sizable dispute at 519 pages on ucleate boiling mechanism.Now have recognized that the importance that is maintained in nucleate boiling in this case.For keeping the wetting of heat exchanger surface, this notion is very important, and this is to utilize the feed stream that contains any blocking pollution thing to contact with heat exchange surface why and the reason that do not have any danger of obstruction.When steam output greater than 50% the time, interchanger will produce gel in a large number.

Here the technology of Ti Chuing provides a kind of processing to contain the method for the feed stream of blocking pollution thing.Blocking pollution thing in the feed stream can directly contact with heat exchanger surface, and can not stop up.According to the understanding of Tsuruta, back one feature is impossible.This point was said in the above.This is the understanding to principle above-mentioned, and this principle relates to makes this method realize desirable result.In brief, Tsuruta is applicable to use the present invention.

Another FAQs in the water distillating method is to need high energy input.Do not have under the situation of means of waste heat source and this intake of efficient recovery, energy needed equals the latent heat of vaporize water under setting pressure/temperature.Under this condition because the additional application of water, the distillation of water industrial be infeasible.The heavy oil production unit normally form by being suitable for reclaiming as waste thermal energy by the logistics of high energy gamma source.

In order to overcome the problem in traditional distillating method, must consider several variablees.Three following equations have been described the basic heat transfer relation in the water distillation system:

Q _(always)=U*A*LMTD (1)

Q _{(sensible heat)}=m*Cp* (T1-T2) (2)

Q _{(latent heat)}=m*L (3)

Wherein

Heat (the BTU hr that Q=transmits ^-1)

The ability of U=overall heat transfer coefficient or systems communicate heat (BTU hr ^-1Ft ^-2F ^-1)

A=heat transfer area (ft ²)

The hot motivating force (F) of LMTD=log-mean temperature difference or system

Fluid mass flow (the 1b hr of m=liquid or steam condition ^-1)

Cp=fluidic specific heat (BTU hr ^-1F ^-1)

T1, T2=enter or the fluidic temperature (F) of outflow system

Latent heat (the BTU lb of L=evaporation or condensation ^-1)

For an effective Distallation systm is arranged, the heat Q that expresses with aforesaid equation, exchange and reclaim must be maximum, simultaneously, obeys and keep the practical limit of variable and prevent fouling and obstruction.For given fluid and hydrokinetics, in given heat-exchange equipment, comparatively speaking, variable U, Cp and L are non-variablees.Therefore, in order to overcome and the relevant problem of distillation polluted water, must think over variables A, Q/A, LMTD, m and T1 and T2.

To distill relevant problem in order solving fully with the polluted water from the heavy oil heat recovery equipment, and to eliminate fouling, other important factor that also will consider except that above-mentioned fundamental equation is:

Transform the effective used heat energy;

Heat passage speed in Distallation systm is known as heat flux or QA ^-1(Btuhr ^-1Ft ^-1)

The amount of pollutent in the enriched material;

With respect to the temperature of saturation of vapour stream, the final boiling point of enriched material;

The degree of super saturation of enriched material and precipitation capacity; With

The steam output of vaporization stream.

Before the present invention occurs, from the effectively reclaiming waste heat energy of heavy fuel equipment, and make the heat that transmits in the water still-process and reclaim maximum, and do not have the tendency of obstruction and fouling, in long time, still do not realize.

Now developed a kind of method, be not only Energy Efficient, and eliminated the scale problems that the past runs in the polluted water distillation, water is polluted by organism, inorganics, metal etc.

The present invention has further developed the notion of setting up in original application.Previous notion is relevant with two different concepts, comprises using vapor recompression and in conjunction with the distillation or the distillation of multiple-effect water of the waste heat recovery of single heat recovery circuit.By further combined with recovery from low-grade thermal energy source in the heavy oil heat recovery units; and the forced convection recovery of heat of unique structure and transmission loop; discovery can obtain result very likely: make the maximum of conducting heat; need not compress and can or make it minimum; kept required forced convection circuit simultaneously; can not conduct for the fouling interchanger, this can run into when the implementation criteria distillating method usually.

Have now found that, the unitary exhaust steam energy of recovery of oil of retrieving in the heat transfer loop again to conduct oneself with dignity, these rudimentary energy can be used to reduce or eliminate into handling the necessary draught of waste water, these rudimentary energy of past are used as excess energy or non-recoverable energy usually and are discharged, and this just greatly reduces the industrial value of method.

Based on this method, in high-pressure discharge liquid, can obtain the wasted energy source from the high pressure steam separator, high-pressure separator is flashed to low pressure and forms rudimentary steam and hot salt brine under about 10-15psig.In heated separator (heated separator), low-pressure steam is as the thermal source of evaporative distillation water, and itself further is condensed into high-quality boiler feed water.Spissated heat discharge is used for the production water feed stream that preheating enters before entering heated separator.

Furtherly, the production fluidic decompression of returning from the heavy-oil reservoir oil reservoir can obtain significant wasted energy source.The pressure of the production liquid that returns from oil bearing reservoir is generally 50-300psig, is depressurized near normal atmosphere in degassing separator.Oil/aquatic runoff yield body is transported to conventional normal pressure oil/water separation equipment, and these equipment are known to those skilled in the art.Wasted energy can two kinds of methods extract.If after well is heated, in the heavy oil reclaimer operation, not use ascending gas and only have minimum bound gas to be present in the production logistics, waste streams is isolated from degassing cylinder, and is transported to and is used for the recoverable efficient distillation of used heat unit.If in well, use the production of ascending gas with auxiliary heavy oil, and/or there is a large amount of relatively bound gas to be present in the production fluid, then waste thermal energy just can reclaim with any suitable heat-exchanger rig, and utilizes the heat-transfer medium fluid to be delivered to efficient distillation unit to reclaim used heat.In this example, refrigerative is produced fluid and is outgased in degassing cylinder, and does not have considerable vapor losses.The state of thermal excitation prior art is fiercely to drive oil bearing reservoir to improve the rate of recovery of heavy oil, makes that the production fluid temperature (F.T.) of production wellhead is higher.This temperature has surpassed common 230 °F to 400 °F, even reaches 500 °F.Therefore, can obtain a large amount of callable heat energy to be used for efficient water distillation unit.

An object of the present invention is to provide a kind of improved High-efficient Production water recovery method, be used to distill the water that contains organic and inorganic, metal or other pollution compound, obtain the pure water cut and do not make distillation plant that any fouling is arranged.

In an aspect of the invention on the other hand, provide a kind of method of recovered energy, be used for from the water of the oil bearing reservoir recovery heavy oil that contains heavy oil and water with processing, this method may further comprise the steps:

A) provide the water feed stream;

B) the treating water feed stream is to produce steam cut and liquid distillate;

C) be provided for the vapour separator of separate vapour cut and liquid distillate;

D) separate vapour cut and liquid distillate;

E) provide oil-water separator and water distillation plant;

F) the steam cut is injected oil bearing reservoir;

G) in water-and-oil separator, collect from the heavy oil and the production water of oil bearing reservoir;

H) collect heavy oil and produce water from separator;

I) provide the heat energy that is contained in the liquid distillate to the water distillation plant; With

J) water distillation plant process for producing water.

A scheme provides a kind of method of recovered energy on the other hand in the present invention, is used for from the water of the oil bearing reservoir recovery heavy oil that contains heavy oil and water with processing, and this method may further comprise the steps:

A) provide the water feed stream;

D) separate vapour cut and liquid distillate;

E) provide oil-water separator and water distillation plant;

F) the steam cut is injected oil bearing reservoir;

G) make heavy oil, the decompression of production water, form the steam of discharging from oil bearing reservoir;

H) transmission ofenergy that will be contained in the steam arrives the water distillation plant; With

I) separate heavy oil and production water.

In the present invention a scheme more on the one hand, a kind of method of recovered energy is provided, be used for reclaiming the water of heavy oil with processing from the oil bearing reservoir that contain heavy oil and water, this method may further comprise the steps:

A) provide the water feed stream;

D) separate vapour cut and liquid distillate;

E) provide oil-water separator and water distillation plant;

F) the steam cut is injected oil bearing reservoir;

G) reclaim heat energy from the heavy oil of discharging oil bearing reservoir with producing the water with interchanger;

H) separate heavy oil and production water;

I) provide heat energy from heat-exchange equipment to distillation plant;

J) provide the heat energy that is contained in the liquid distillate to the water distillation plant; With

K) water distillation plant process for producing water.

The another aspect of a scheme provides a kind of method from heavy oil recovery system recovered energy in the present invention, and wherein heavy oil is contained in the oil bearing reservoir, and energy is used for handling the production water that heavy oil reclaims, and this method may further comprise the steps:

A) provide vapour source with steam cut and liquid distillate;

B) provide water-and-oil separator and water distillation plant;

C) inject at least a portion steam cut and liquid distillate to return to oil bearing reservoir by heavy oil;

D) in water-and-oil separator, collect from the heavy oil and the water of oil bearing reservoir;

E) separation is from the heavy oil and the production water of separator;

F) provide the heat energy that is contained in the liquid distillate to the water distillation plant; With

G) water distillation plant process for producing water.

A scheme provides a kind of method from heavy oil treating processes recovered energy on the other hand in the present invention, to handle the production water in heavy oil reclaims, may further comprise the steps:

A) provide the high-pressure discharge logistics;

B) logistics of flash distillation high-pressure discharge is to form low pressure wasted energy logistics and concentrated effluent streams;

C) produce water with low pressure wasted energy logistics evaporation;

D) produce the water feed stream with concentrating the effluent streams preheating;

E) provide and comprise the heated separator that fluid flow connects and the fluid circulation loop of the interchanger that boils again;

F) make the production water feed stream of preheating enter heated separator;

G) make wasted energy enter reboiler to reclaim heat energy;

H) in the interchanger that boils again, produce the water logistics and pollute cut to produce steam cut and concentrated liquid with the wasted energy evaporation;

I) make at least a portion concentrated liquid cut cycle through boil again interchanger and heated separator, with the quality ratio of keeping enriched material and steam cut between 300-2, boil the again steam cut of interchanger of feasible discharge is about 1% (quality) to less than 50% (quality), thereby prevents obstruction and fouling in the reboiler;

J) with external condensation device condensed steam cut; With

K) the steam cut and the free of contamination basically wasted energy logistics of collection condensation.

Have now found that, by accurate Control Circulation mass ratio 300 to about 2 times in the scope of discharging the reboiler steam cut, can be achieved as follows desirable advantage:

1. the steam cut that can contain accurate control through the circulation enriched material of reboiler evaporation side is 1% to 50% of the enriched material quality that circulates approximately;

2. by accurately controlling this steam cut, the rising of circulation enriched material temperature keeps very lowly (about 1 °F), and under the temperature near the circulation concentration logistics, it is moistening that the heat exchanger surface that boils again keeps, and has reduced the danger that these surfaces are stopped up;

3. owing to control low steam cut, the concentrated fluidic partial concn factor in the interchanger is reduced to greatly less than 1.1, has avoided scale-forming compound in the heat exchange surface localized precipitation;

4. because steam forms in the reboiler exit, and the velocity of steam in the heat exchanger channels improves widely, thereby has promoted good mixing, reduced the danger of stopping up;

5. by the steam cut in the control evaporative fluid, realized a large amount of heat transfers, non flouling behaviour and the temperature intersection (atemperature cross) that causes in interchanger by the latent heat means;

6. because the rising of the temperature of reboiler evaporation side is very little, keep the LMTD of reboiler, therefore, kept the energy of required input very low;

7. by regulating heat flux, the temperature of the wetted surface of condensation and evaporation be maintained at approach to evaporate with condensing condition under saturated steam conditions under.Such boiling is in from being mainly forced convection stablizes the ucleate boiling to wetted surface; With

8. by providing the device that boils again,, compress required energy and be eliminated if can obtain the effluent streams of sufficiently high pressure to absorb rudimentary waste thermal energy from the heavy oil recovery system.

The further aspect of a scheme of the present invention provide a kind of from the heavy oil treating processes method of recovered energy, to handle the water that heavy oil produces in reclaiming, this method comprises the steps:

A) provide the high-pressure discharge logistics;

C) produce water with low pressure wasted energy logistics evaporation at least a portion;

D) produce water with concentrating the effluent streams preheating;

E) provide and comprising the heated separator that circulation connects and the fluid circuit of the interchanger that boils again;

F) provide and comprising heated separator, compressor that circulation connects and the steam-return line of the interchanger that boils again;

G) make the production water of preheating enter heated separator;

H) in the interchanger that boils again, evaporate the production water of preheating, to produce steam cut and concentrated liquid cut with low pressure wasted energy and compressed vapour logistics;

I) utilize the external condensation device to handle formed steam cut by the low pressure wasted energy;

J) utilize compressor to reclaim any remaining steam cut;

K) make the spissated liquid distillate of at least a portion cycle through boil again interchanger and heated separator, with the quality ratio of keeping enriched material and steam cut 300 between near 2, boil the again steam cut of interchanger of feasible discharge is about 1% (quality) to less than 50% (quality), thereby prevents obstruction and fouling in the reboiler; And

L) collect the steam cut of condensation and the wasted energy logistics of contamination-free substantially.

Scheme of the present invention provide on the other hand a kind of from the heavy oil treating processes method of recovered energy, to handle the water that heavy oil produces in reclaiming, this method comprises:

A) provide the high-pressure discharge logistics;

C) produce water with low pressure wasted energy logistics evaporation;

D) produce water with concentrating the effluent streams preheating;

F) make production water feed stream pass through heated separator;

G) make the low pressure streams wasted energy enter reboiler;

H) in the interchanger that boils again, produce water with the evaporation of low pressure wasted energy and pollute cut to produce the first steam cut and concentrated liquid;

I) make the spissated liquid pollutant cut of at least a portion cycle through boil again interchanger and heated separator, with the quality ratio of keeping enriched material and steam cut between 300 to about 2, boil the again steam cut of interchanger of feasible discharge is about 1% (quality) to less than 50% (quality), thereby prevents obstruction and fouling in the reboiler;

J) provide crystallization apparatus and lead to the interchanger that boils again that connects with vapor fraction stream;

K) remove a part of concentrated liquid pollutent cut to be input to crystallization apparatus;

L) make the steam cut enter reboiler, for from providing heat energy from being settled out solid the concentrated liquid pollutent cut;

M) produce the second steam cut and be essentially the logistics of solid cut from crystallization apparatus;

N) with the condenser condenses second steam cut; And

O) the first steam cut, the second steam cut of condensation and the wasted energy logistics of condensation of collection condensation.

As the further advantage of present method, its input cost is zero.If this is owing to can utilize enough rudimentary wasted energys, just do not need compressor to come process for producing water.Furtherly, this method has realized 100% water recovery, and discharge of wastewater is zero, because pollutent has been converted to solid.

Say that loosely in possible scheme, distilled water is evaporated, and also cross net and remove any droplets entrained, there by external condensation.The wasted energy logistics enters reboiler, is condensed into distilled water there.By the Control Circulation enriched material amount of vapour stream is being lower than 300 to about 2 scope, is producing in the circulation concentration logistics less than 50%, or rather in less than about 10% steam, heat energy is delivered to the circulation enriched material from heated separator.The steam that forms in the logistics of circulation enriched material absorbs the heat that passes over by the latent heat of evaporation, makes the temperature rising of circulation enriched material be no more than 1 °F simultaneously.Under condensing temperature and pressure, the clean distilled water of collecting from external condensation device and the interchanger that boils again is returned as high quality steam producer feed water.Meanwhile, remove a part of concentration logistics, to control the required concentration of non-volatile pollutent from heated separator.Under the temperature and pressure of heated separator, the concentration logistics of discharge can pass to production water feed stream by preheater with remaining sensible heat.Before the distillation procedure, among or afterwards, can use additional pre-treatment or post-processing technology with intermittently or continuous mode remove or comprise pollutent.Can use the pH control method or add other chemical so that volatile constituent ionization or change dissolution conditions in the enriched material with the described distillating method of further improvement.Can reclaim a large amount of distilled water, surpass 90% of feed water logistics usually.When further use crystallizer, can realize that 100% of water reclaims.

From the range of this method, can be used for that any use steam heat excites the heavy oil reclaimer operation, as conventional steam inject, cyclic steam excite (CSS or Huff n ' Puff), steam assisted gravity oil extraction method (SAGD) and steam and gas propelling method (SAGP).Here limit that listed is not, only as an example.

A) provide the water feed stream;

B) handle described water feed stream to produce steam cut and liquid distillate;

C) be provided for separating the vapour separator of described steam cut and described liquid distillate;

D) separate described steam cut and described liquid distillate;

E) provide degassing separator;

F) provide oil-water separator;

G) described steam cut is injected described oil bearing reservoir;

H) produce heavy oil, production water and waste material steam;

I) in the described degassing separator flash distillation with described waste material steam;

J) in described water-and-oil separator, collect described heavy oil and production water;

K) from described water-and-oil separator, separate described heavy oil and production water;

L) the contained heat energy of one of the following offers distillation plant at least: step h) described production water and waste material steam, the described liquid distillate of step b) or step I) described waste material steam;

M) production water regulating step h); And

N) store adjusted and distillatory water.

A) provide the water feed stream;

D) separate described steam cut and described liquid distillate;

E) provide oil-water separator and water distillation plant;

F) described steam cut is injected described oil bearing reservoir;

H) separate described heavy oil and produce water from separator;

I) provide the heat energy that is contained in the liquid distillate to the water distillation plant;

J) unnecessary heat energy circulation step i) is injected into described oil bearing reservoir; With

K) with described water distillation plant process for producing water.

In an aspect of the invention on the other hand, provide a kind of method that removes pollutent from the feed stream that contains pollutent, described feed stream is used for reclaiming heavy oil from the oil bearing reservoir that contain heavy oil, and this method may further comprise the steps:

A) provide the water feed stream;

B) preheat water feed stream in the first step until from water vapor, removing some pollutents to small part, and from enriched material and distillment recovered energy;

C) heating preheated water feed stream in second heating steps in the separator that has heated generates the spissated liquid distillate that contains pollutent of steam cut;

D) the described steam cut of compression in compressor produces the temperature difference in the interchanger that boils again;

E) temperature difference in the described interchanger that boils again of control and the temperature of enriched material to keep nucleate boiling, wherein keep wet surface in described boiling hot again device;

F) at least a portion of described enriched material is circulated by described interchanger and the described separator that has heated of boiling again, the mass ratio that keeps enriched material and steam cut between 300-2, the resulting steam cut that leaves the interchanger that boils again less than 1 quality % extremely less than 50 quality %;

G) the described steam cut of condensation is collected distillate;

H) provide vapour generator;

I) in described vapour generator, produce high pressure steam with described distillate;

J) provide steam turbine, and be connected, to drive described compressor with described compressor;

K) exhaust steam with described steam turbine is injected into described oil bearing reservoir;

L) collect heavy oil and produce water from described oil bearing reservoir; And

M) separate heavy oil and production water.

Find that the good antiscale property loop can directly connect, and driven by high pressure steam to utilize steam-powered turbine, and described steam drives the compressor in good antiscale property loop.Described SAGD operation before as mentioned above, high pressure steam can stem from.

By the loop with turbine and crystallizer is provided, and to utilize good antiscale property loop, favourable result be that the loop can produce basically 100% water recovery, self-pollution and significantly reduce in this series unit operation the inherent insoluble compound until the solid loop.Another main advantage is that the combination in these loops or loop can merge with the heavy oil reclaimer operation, forms stronger heavy oil and reclaims, and reduce energy requirement, good antiscale property and significantly improve economy.

Had foregoing description, described referring now to preferred version shown in the drawings.

Brief description of drawings is as follows:

Fig. 1 is the general illustration of a scheme of the present invention;

Fig. 2 is the general illustration of another program of the present invention;

Fig. 3 is the synoptic diagram of the unit for treating water in the scheme of the present invention;

Fig. 4 is the variation scheme of Fig. 2;

Fig. 5 is another variation scheme of Fig. 3;

Fig. 6 has schematically described the temperature and pressure condition commonly used around the evaporation component;

Fig. 7 is boil the again process condensation/vaporization curve of interchanger of system;

Fig. 8 has schematically described the flowing type of reboiler plate/sheet heat exchanger;

Fig. 9 is that explanation is present in the figure that concerns between steam output in the reboiler in the circulating fluid and circulating fluid quality and the quantity of steam ratio;

Figure 10 describes the figure that the localized concentrations degree changes with the steam cut in the reboiler;

Figure 11 is the figure of explanation from the testing data of pilot scale distillation unit acquisition;

Figure 12 is the general illustration of another program of the present invention;

Figure 13 is the general illustration of another program of the present invention;

Figure 14 is another variation scheme of method shown in Fig. 1 and 2;

Figure 15 is the synoptic diagram of another variation scheme of Figure 14;

Figure 16 is the variation scheme according to the method for another embodiment;

Figure 17 is another embodiment of the present invention according to another embodiment; With

Figure 18 A is Fig. 4 of Tsuruta patent; Figure 18 B is amended Tsuruta patent

In specification sheets, similarly number is used to represent similar elements.

Referring to Fig. 1, show an embodiment of a scheme of the present invention.Feed water is collected in the feed water storage tank 110.Water can be from suitable underground water source 105, or by conventional water treatment method in 100 circulations or replenish, as lime or alkali soften, ion exchange softening or distillation.Importantly must make as the hardness component of calcium, magnesium and silicon and from feed water, remove, to prevent high pressure steam generator 125 foulings.Should be taken into account also that in addition dissolved solids must be lower than 8,000ppm (w) is 80% high pressure steam to produce required steam parameter.(total dissolved solids TDS) mainly is made up of sodium-chlor total dissolved solids.For pilot scale thermal treatment of heavy equipment, the amount of water can be low to moderate 10,000 barrels of every days that (barrels per day BPD), can surpass 100,000 BPD for industrial thermal treatment of heavy equipment.

Adjusted water from 110 is pumped into high pressure steam generator 125 by a series of fresh feed pumps 115.In general, it is the steam of 60-80% that vapour generator 125 produces steam parameter, and its pressure is 1,000psig to 3, and 000psig or higher, this depends on the situation of oil bearing reservoir.This oil field vapour generator is known those skilled in that art, because the restriction that its inherent design and duct ligation dirt are produced, its steam parameter is limit less than 100%.If can obtain high quality water, as distilled water, can use other boiler, conventional steam boiler or associating (Cogeneration) thimble-tube boiler produces full steam, the steam of 100% steam parameter or superheated vapour.

Some heavy-oil reservoir oil reservoir for example uses the heavy-oil reservoir oil reservoir of SAGD technology, under the situation that does not influence the recovery of oil performance, can not transmit steam parameter less than 100% steam to oil bearing reservoir.In these operations, high pressure steam separator 130 is used for saturation steam 135 is separated with high-pressure liquid phase 140, and high-pressure liquid phase also claimed hot salt brine.Some equipment utilized an energy that can obtain by in 120 places and 115 heat exchange of vapour generator feed water from 140 before pressure release.The heat that reclaims changes with the pressure at 135 places, but is limited to sub-fraction usually.Therefore, for most of SAGD heavy fuel equipments, have a large amount of available waste thermal energies in logistics 140, its use is restricted, and is denied to usually in cooling tower or the water cooler as used heat.This wasted energy can be transported to efficient water distillation unit 180 with process for producing water 175, and industrial cost that reduces water treatment and the production cost that improves heavy oil are had a significant effect.Yet obvious effects is the benefit on the environment, and make up water and polluted water to be processed have been eliminated, and a large amount of wasted energys are recovered, thereby has reduced the consumption of combustion gas and discharging always in air.

High pressure steam 135 is injected into oil bearing reservoir 145 by the boring 150 of well.According to the kind of employed heavy oil recovery technology, the structure of well is different.Fig. 1 illustrates typical SAGD device, and steam is injected in the horizontal well boring, and heavy oil is produced fluid and reclaimed in adjacent horizontal well boring 155.Produce fluid and collect, and be transported to recovery of oil equipment 165 through producing pipeline 160 on the face of land.The heavy oil that is lower than 20 ° of API but is higher than 7 ° of API is removed and sells to carry out refining of petroleum.

Usually be that the production water of collecting under the 2-5 175 is transported to unit for treating water 180 at O/W.Produce in the water and contain sodium-chlor, silicon oxide, the organic hydrocarbon of dissolved, calcium and magnesium, they mainly come from oil bearing reservoir and original additional water source.

Spissated effluent brine or solid can extract with logistics 185 from unit for treating water 180.Industrial value is not had in this logistics usually, needs fixed point or handles outside factory, and this depends on the position of heavy fuel equipment.

In general, efficient distilled water processing unit 180 can pure distilled water logistics 100 reclaims the production water of 80%-100%.

Referring to Fig. 2, illustrate the embodiment of another program of the present invention.In the represented heavy oil recovery system of this embodiment, after recovery well boring 155 and well head 160, require to produce the fluidic heat condition and be higher than conventional 230 °F, near 400 °F to 500 °F, to improve the recyclability of heavy oil.The production fluid of heat is by degassing separator 161, and its pressure reduces at 162 places, and is input to oil/water sepn unit.Usually under the pressure of 40-60psig (being usually less than 100psig), from degassing separator 161, produce steam 163.This rudimentary steam 163 is transported to efficient water distillation unit 180, is used for from producing water evaporative distillation water.If the lift gas amount with respect to steam combination that produces and/or injection is few, then can use this heat recovery technology in producing fluid 160.

If have quite highly in conjunction with gas content in heavy oil, this seldom runs into, and/or lift gas again production well bore 155 manually injected, then need alternate energy recovery technology.This heat is produced fluid and will be transmitted by any suitable heat-exchanger rig to entering degassing separator 161 temperature reduction before again.Waste thermal energy adopts suitable heat exchange medium to extract from 164, and is delivered to efficient water distillation unit 180 by 166, being distilled water with aquatic product.

When shown in Figure 2, two kinds of heat recovery methods using logistics 140 and 166 can separately or be used in combination, and this depends on the operational condition of heavy-oil reservoir oil reservoir 145 and the benefit that each method obtains.

Referring now to Fig. 3,, illustrates a embodiment by 180 represented efficient distillation unit schemes.

Produce water feed stream 175 and be introduced in pre-treatment step 12, to remove solvend, volatile matter and/or adjusting pH value or set-up procedure to prepare feed stream 175.Volatiles discharges from feed stream with logistics 14, and not volatile component is discharged from feed stream with logistics 16 simultaneously.Then, enter pre-heaters 18 to improve the temperature of feed stream, before being incorporated into heated separator 20, increase the recovery of sensible heat from the 12 pretreated feed streams of discharging.Feed stream can be divided into the multiply logistics, reclaims preheater to pass through second sensible heat, thereby maximally utilises this unitary recovery potentiality.This set is understandable to those skilled in the art.A plurality of preheaters can be configured to singlely watch (single multi-service) preheater more, or the separate unit shown in 18 and 26.Feed stream separately remerges, and before entering heated separator 20, is heated to the condition near heated separator.If necessary, feed stream also can be introduced the pump circulation logistics to produce the effect of local dilution in reboiler.Heated separator can comprise a plurality of separating units, as cyclonic separator.In its underpart 22, can make that solid matter circles round and suspends in enriched material and the discharge, these materials are referred to as " discharge " or enriched material, represent with pipeline 24.Discharge 24 can be continuously or discharging in batches, its flow control component concentrations in the heated separator 20, thereby regulated boiling temperature in saturation ratio, degree of supersaturation, the solid precipitation that causes thus and the heated separator 20 of enriched material.Discharge 24-with the temperature in the separator 20 and concentration-enter second preheater 26 to reclaim heat through pipeline 28.The temperature of effluent streams 24 reduces within about 3 °F near the temperature from 12 feed stream, and with logistics 185 dischargings.

Almost saturated water vapor is contained on the top of heated separator 20, is exclusively used in the separation of vapor/liquid, can comprise that part as grid pad or blade filler (not shown) and so on is to accept drop from steam stream.Represent by pipeline 30 from the steam that heated separator 20 is discharged,,, can contain the water supply of drinkable water or boiler quality according to the component that is present in the feed stream by the fractions consisting of environmental quality.Part steam is transported to compressor 32, so that the pressure and temperature of steam stream is brought up on the heated separator 20.Steam stream can be left heated separator under any pressure, comprise vacuum.Under the condition of heated separator 20, this steam is in state of saturation basically, yet if enriched material contains the component that can improve the steam boiling point of enough high densitys, steam can become supersaturation.This notion is known as the elevation of boiling point or BPR, also is understandable, and therefore compression has obtained suitable compensation.Pass to the additional energy of steam stream and set up interchanger 34 interior required LMTD of thermal conduction or the hot motivating forces of influencing of boiling again.Remaining any a part of steam 46 be transported to any suitable external condensation device 58 with recovered steam as distilled water 48.

Compressor or gas blower 32 can be any devices well known by persons skilled in the art, and it can be to cause the pressure head of about 3-5psi and steam is flowed with certain speed to steam.Actual ram from compressor 32 is determined by each unitary evaporation conditions in the heated separator 20 and reboiler 34 required LMDT.The steam that leaves compressor 32 mainly is superheated vapour.Degree of superheat depends on the efficient of blowdown presssure and compression set 32.Wasted energy in low-pressure saturated steam (be usually less than 100psig, particularly the be lower than 50pisg) form can join in the compressed vapour before entering the interchanger 34 that boils again.Logistics after the merging can reduce the superheating temperature by the compressor input.

The interchanger 34 that boils again is used for the merging steam of condensation from compressor 32 and wasted energy source 51, and discharges distilled water from reboiler 34 to condensation product susceptor 36.This step has captured the overheated and latent heat in the steam stream after the merging, and by the heat driving it has been passed to round-robin concentration logistics 38.Accumulate in the distilled water in the susceptor 36, saturated liquid normally under specific temperature and pressure condition.Return by preheater 18 by the distilled water pump 40 of flowing through that makes heat, the additional sensible heat in the distilled water is recovered, and wherein discharges logistics and cools off about 3 °F, near the temperature of feed stream 12.Before entering preheater 18, can merge to reclaim sensible heat from the distilled water of

susceptor

36 and 48, then, discharge with logistics 100.

Have now found that, by using enriched material recycle pump 42 so that the enriched material of aforementioned quantities cycles through the interchanger 34 that boils again from heated separator 20, can obtain significative results, can not make enriched material excessively concentrated, the danger of the blocked or fouling of heat exchanger surface can not take place.The special quality ratio of selecting circulation enriched material and steam makes it less than 300 between near 2, accurately produces in the logistics 38 of heat exchange 34 is boiled in discharge again near 1% to less than 50% steam cut.By using control device 44, this mass rate can change and be set in the required parameter area.More particularly, consider the feed stream that great majority pollute, the required target of steam cut in the recycle stream 38 of discharging, steam cut less than 10%.The distilled water 100 that the steam that produces in logistics 38 is equaling to reclaim qualitatively.Although its quality of steam that in the interchanger 34 that boils again, produces very little (less than the quality that circulates approximately 10%), absorbed the most of heat that transmits from the condensation side of reboiler 34.The selection of steam cut and enriched material circular flow is to reducing obstruction and fouling, preventing that fluid excessively concentrating in interchanger from being an important factor.Raise in order to set up low-down temperature in the enriched material recycle stream, keeping effective LMTD in interchanger 34 both sides of boiling again, and do not have temperature to intersect (temperature cross), this parameter is most important to a great extent.LMTD is all eliminated in the rising of any temperature soon, and heat transfer will stop.For example, if to such an extent as in reboiler the pressure of the circulation enriched material fluid that rises can not produce some steam because the sensible heat absorption temperature will rise, up to there not being the existence of LMTD or hot drive, therefore, heat transfer will descend.The back-pressure of the enriched material recycle system-comprise quiet and friction loss of pressure head is designed to be minimum.In fact, fall hour when the dynamic pressure of interchanger, back-pressure is substantially equal to the statical head loss of vertical exchanger.Select the spissated flow of circulation to be implemented in the outlet conduit 38 steam cut then near 1%-10%.Resulting temperature rises very low, and LMTD maintains design load.

Fig. 3 illustrates an embodiment, and wherein saturated exhaust steam and compressed vapour merge, to absorb waste thermal energy in single reboiler 34.The steam that merges is condensed and forms condensation distilled water.If obtainable exhaust steam pressure is not harmony, maybe can not make it harmony, specially designed independent concentrate recycle loop then will be provided and the interchanger that boils again to be adapted to each thermal source.Furtherly, if used heat can only obtain by the non-condensing heat-transfer fluid, then design the used heat exchange to extract heat in the heat-transfer fluid that never is condensed into distilled water.This key Design feature of reboiler should be kept the quality ratio of preferred liquid and steam, with the steam of generation 1% to 10% in evaporative fluid.

Referring to Fig. 4, it is the block diagram of another alternative method, allow to regulate discharge logistics 24 from heated separator 20, up to total concentrated effect of system or enrichment factor (CF) with respect to any or multiplely cause that sedimentary component produces the supersaturation enriched material.When forming solid or solid and in heated separator 20, accumulate, make ejecta 24 by solid/liquid separation apparatus 50, to remove solid or slurry.In addition, solid/liquid separation apparatus 50 can be that slip-stream or full stream (slipstream or totalflow) are provided with between the pump 42 and interchanger 34 of reboiler.The liquid that reclaims further is recycled to heated separator 20 with logistics 52, and a part is further passed through preheater 26 with the recovery heat as ejecta, and cooling logistics 175 is to about 3 °F.Solid/liquid separation apparatus 50 can any type ofly be installed, as known in the art strainer, wet cyclone, centrifugal settling separator, gravity separator, whizzer, decantation separator.When main purpose is to reclaim solid chemical compound or when these compounds had tangible industrial value, this method was attractive especially.

Referring to Fig. 5, it is that another becomes example, can contain some in the steam stream from the specific pollutants in the feed stream.Heated separator 20 is furnished with separation column 54, and it is positioned at before compressor 32 and the additional steam pipeline 46.Tower 54 utilizes clean water coolant backflow multistage fractionation in 56 fens and contamination with wash thing.Backflow can be discharged from the upstream or the downstream of preheater 18, and perhaps in conjunction with discharging from upstream and downstream, this depends on required reflux temperature.When feed stream contained volatile matter just like hydrocarbon, ethylene glycol, ammonia, amine etc., this change example method was attractive especially.

Fig. 6 shows typical pressure and the temperature relation of present method around the various logistics of evaporation section.Reference number comes from Fig. 2 to Fig. 4 when discussing.Although concrete processing parameter illustrates as an example, to use in order to be adapted to concrete distillation, they are variable.It has schematically represented can not rise to the fluid boiling point condition on basis, and heated separator 20 is being higher than barometric point a little, promptly operates under the condition of 16psia and 212.5.The temperature of circulation enriched material raise to about 1 °F when the pressure of reboiler was reduced to 2.5psi.The steam cut of recycle stream is about 10%.Interchanger 34 condition on every side boil again by evaporation/condensation curve representation shown in Figure 7.In the condensation side of interchanger, merge from overheated logistics and the saturated used heat stream sources (C2 point) of about 289 and the 21.0psia (C1 point) of compressor, be under the vapo(u)rous pressure at C '-about 232 and 21.0psia condensation.This zone is referred to as superheat region usually, is made up of about 2% exchange area, and remaining areas is the area that discharges condensation latent heat.Raise with the ratio of saturated used heat and compressed vapour, neededly go overheated area to descend.Because interchanger inherent pressure falls, and can cause the slight decline of pressure and temperature by interchanger 34.The condition in exit changes to about 231.8 and 20.9psia.The surface temperature of condensation side is lower than the temperature of saturation that enters steam, therefore, has formed the film of condensation at heat exchanger surface.Therefore conduct heat and take place, break away from wet wall condition, remain on the significant temp of film under the vapo(u)rous temperature.Distilled water is discharged to the susceptor 36 (D point) of condenser from interchanger, and keeping does not have liquid in the reboiler, and all heat exchange surfaces are exposed to condensation process.

In evaporation side, after passing through recycle pump 42, enriched material enters interchanger (A point)-about 212.5 and 18.0psia from the bottom adverse current.Regulate circular flow so that at least 10 times of the mass rates of enriched material to the flow of steam.The temperature of enriched material fluid rises to A ' point, and then is stabilized in about 213.2 °F when arriving the B point, wherein overcomes statical head, and pressure is reduced to 15.5psia.Enriched material rises in interchanger 34 simultaneously, because forced convection forms steam, absorbs the latent heat that passes over.By improving the liquid mass flow of evaporation side, fall in the required scope up to the ratio of circulation quality and quality of steam, the effect of seething with excitement is controlled under the state of forced convection and stable ucleate boiling.Because the flow height of liquid, heating surface keep wetting under the temperature of the temperature of saturation that is equivalent to the new steam that forms.Flux (QA by further assurance interchanger ^-1) less than 6000 BTU hr ^-1Ft ^-2, the temperature of evaporation side rises can keep below 1 °F, keeps the wet film surface, therefore, has eliminated the danger of fouling.If flux is too high, instant steam quickens that pressure drop temporarily surpasses can obtainable statical head, can cause unsettled temporary transient anti-stream, and may break wetting heat exchange surface.May cause the fouling of heating surface like this.Heat flux is lower than 6000 BTU hr ^-1Ft ^-2, and circulation enriched material quality and quality of steam less than 300 scope in, then in stable operation, have the zone of liquid and steam coexistence, keep the heating surface of complete wetting in the evaporation side of reboiler, do not exist and stop up or the danger of fouling.

Referring to the point of the A among Fig. 8 to the D point.

Fig. 8 is the front view of efficient heat transfer interchanger 34, is plate and frame interchanger well known by persons skilled in the art, and the backing plate 60 of wherein many row's vertical pile is between two firm frameworks 62 and 64.These devices are known, and they are of compact construction and very high U value or overall heat transfer coefficient.The interchanger of such one way counterflow configuration setting is well suited for the present invention, and following advantage is provided especially in the present invention:

1. plate-type heat exchanger has low, fixed statical head, on enriched material cycling stream side or evaporation side have low-down pressure drop, high relatively heat transfer coefficient is provided simultaneously;

2. by in given framework, acquiring more multilist area or plate, can easily regulate heat flux;

3. the condensation side of plate frame structure is freely discharged and is had low pressure drop, has kept high relatively heat transfer coefficient;

4. high relatively heat transfer coefficient makes surface temperature very near both sides fluidic temperature, has reduced the danger of fouling;

5. height disturbance and suitable high fluid velocity have caused low fouling, make solid keep suspending uniformly by interchanger the time;

6. do not have focus or cold spot for plate frame structure, do not have the dead angle, reduced the danger of obstruction or fouling;

7. plate is flat, and polished, has reduced the danger of stopping up; And

8. fluidic residence time weak point has reduced sedimentary danger, because they do not have time enough to reach balance and produce the scaling fouling thing.

More generally, plate-type heat exchanger is very compact, can make by special (exotic) alloy sheets, in case anti-avulsion salt use in recurrent flow-induced corrosion and stress corrosion cracking.If keep specific requirement of the present invention, those skilled in the art also can consider to use the interchanger of other type, as package type, double-tube type, finned tube type, coil-type (spiraltype).

Fig. 9 show circulation enriched material and steam mass flow ratio by the preferred design scope shown in 66.This required scope is about 10 to 100, makes vapor fraction less than 10% to about 1%.

Figure 10 show in the interchanger to supersaturation and the dangerous relevant partial concn factor CF of precipitation _InterchangerInfluence.In general, the concentration factor of system is expression like this:

CF _Always=CF _DischargeCF _Interchanger

The concentration that reaches steady state in heated separator is produced by stably removing devaporation, steam with reach balance from the continuous ejecta of heated separator.CF _AlwaysValue usually less than 5 to about 20 times order of magnitude, depend on the amount and the kind of the pollutent in the feed stream.According to the amount of the steam that leaves reboiler, determine resulting CF _Interchanger(between 1.0 to 1.1) are regulated delivery flow and are made the desired concn level in the reboiler not too high.Typical example is as follows:

Feed stream contains 20, and 000TDS requires to be no more than 100 in the enriched material, 000TDS.

Determine that the most effective quality ratio is 20, by Fig. 7, causing vapor fraction is 5%.

In Fig. 8, find CF _Interchanger, be about 1.07.Calculate CF _AlwaysBe (100,000/20,000)=5.

Calculate CF _EjectaBe (5/1.07)=4.7.

Therefore, revising delivery flow is (1/4.7)=21% of feed stream.

Therefore, by using vapor recompression and waste recovery method to combine with the forced convection heat transfer system, and the ratio of next carefully selecting recycle system mass rate and steam stream mass rate selects heat flux less than 6000 BTU hr less than 300 to about 2, particularly about 10 to about 100 ^-1Ft ^-2, to regulate and discharge logistics to obtain the desired concn factor (CF), consequently very effective water distillation unit is difficult for taking place to stop up and fouling under prolonged operation.By in conjunction with two kinds of known process programs, and introducing has the waste heat recovery scheme of unique heat exchange structure, more particularly, be to have scheme specific enriched material recycle ratio, that non-prior art is instructed, the invention provides effective means to distill out the water that does not contain pollutent, do not have the danger of obstruction and fouling.

Following examples are used to explain the present invention.

Embodiment 1

The calculating of this embodiment is that proof is in a kind of means of interchanger ambient heat equilibrated of boiling again.On behalf of design, this embodiment be used for from the unitary design basis of distillation of pollutent water source recovery 53,000 USGPD cleaning distilled water.

Interchanger information

Surface-area 3,200ft ²

Type sealing (gasketed) plate and frame

U 542 BTU hr ^-1ft ^-2F ^-1

Proofread and correct LMTD 10.40F

Calculated load (3,200) * (542) * (10.40)

18,041,224 BTU hr ^-1

Calculate heat flux (18,041,224)/(3200)

5638 BTU hr ^-1ft ^-2

Condensation side

Entry condition 289 °F @21.0psia (overheated)

Exit condition 231.8 °F @20.9psia

Saturated condensing temperature 232.0 °F @21.0psia

Condensation latent heat 957.4 BTU lb ^-1@21.0psia

Steam flow 36.7USgpm=18,352lb hr ^-1

Q _{It is overheated to go}(18,352) * (0.45) * (289-232)

471,131 BTU hr ^-1

Q _Condensation(18,041,224-471,131)

17,570,093 BTU hr ^-1

Calculated flow rate (17,570,093)/(957.4)

18,352lb hr ^-1

Evaporation side

Entry condition 212.2 °F @18.0psia

Exit condition 213.6 °F @15.5psia

Vaporization heat 968.9 BTU hr ^-1@15.5psia

Circulation quality and quality of steam ratio 10

Enriched material circular flow 370USgpm

184,926lb hr ^-1

Steam flow 18,352lb hr ^-1

Steam per-cent (18,352/184,926)=10%

Q _Evaporation(18,352) * (968.9)

17,782,328 BTU hr ^-1

Q _{Sensible heat}(184,926) * (1.0) * (213.6-212.2)

258,896 BTU hr ^-1

Q _Always(17,782,328)+(258,896)

18,041,224 BTU hr ^-1

This embodiment explanation produces 10% steam fraction in circulating fluid can capture 99% the heat that passes over from condensation side, and makes the temperature of circulating fluid raise about 1 °F, even in the circulating fluid of 10 times of quality.

Embodiment 2

Design is also made a kind of model machine to reclaim 10 from the sewage lagoon of rubbish leachate, the distilled water that 000USgpd is clean.This equipment is collected detailed performance test data in the meantime at long-time build-in test.The pilot scale operation has successfully been carried out four months, and the obstruction that is checked through in reboiler and heating and separating can be ignored.The equipment that uses in pilot scale comprises Spencer ^TMModel GF36204E blowing-type compressor, its pressure reduction is 3.0psia.Also used one way plate and frame interchanger at test period.

The leachate charging, concentrate ejecta and the feature of the effluent handled as follows:

Parameter	Unit	The leachate charging ⁽²⁾	Ejecta about 10% ⁽²⁾	The effluent of handling ⁽²⁾
Parameter	Unit	The leachate charging ⁽²⁾	Ejecta about 10% ⁽²⁾	The effluent of handling ⁽²⁾	The ammonia that the total P of BOD COD TOC TSS VSS TDS calcium magnesium sodium iron represents with N is with CaCO₃The total coliform colour of the total phenol of the basicity sulfuric chlorohydrin root turbidity of expression	mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1 mg l ^-1Individual/100cc TCU NTU	26 277 59 33 15 5,473 96 228 550 5 1.5 53 2,353 217 350 0.08 673 166 131	88 1,207 549 145 29 53,000 435 1,990 4,650 469 1.5 124 2,930 784 20,000 0.45 ＜3 800 220	＜10 11 6 ＜2 ＜2 ＜50 ＜0.05 ＜0.05 ＜2 .6 ＜0.01 0.38 ⁽¹⁾ 1 0.2 ＜2 .017 0 ＜5 0.1

Annotate (1)-pH preconditioning with control ammonia.

Annotate (2)-shown in be the mean value of test period.

Effluent should have such quality: can be discharged into the requirement that in fact surperficial water body also surpasses all rules.At various performance points, comprise stop with cycling condition under, measure the power that compressor consumed and also note.The watt consumption of measuring is drawn among Figure 10, as per 1, and the watt consumption of the various distilled water of 000USgal.Proofread and correct the test data curve at the lost work of compressor in flow range, deriving uniform power consumption is 50KW-hr/1,000USgal.If the efficient of standard compression machine is about 77%, efficiently distills the required watt consumption in unit and be about 65KW-hr/1,000USgal.At whole test period, it is about 10% that the ejecta levelling all accounts for, and the mean concns factor (CF) is about 10.After test, naked eyes detect, and do not have the sign of fouling in heated separator and reboiler equipment.

Referring to Figure 12, show another variation scheme of the present invention.In this scheme, be accepted and be transported in the efficient water distillation unit 180 from the hot salt brine ejecta 140 of crossing of high pressure steam separator 130 shown in Figure 1.

Discharge logistics 140 and in light pressure separator 200, flash to logistics 203 of low pressure (being generally 10-15psig) wasted energy and low pressure enriched material discharge logistics 235.Wasted energy logistics 203 is condensed into distilled water by the interchanger 205 that boils again, and is collected in the storage cylinder 215.

High-pressure thick indent out

logistics

235 and 240 heat exchange are preheated to 245 will produce water 175.Refrigerative concentrates ejecta and discharges with logistics 185.Be passed in the circulation enriched material from heated separator from the wasted energy of logistics 203, by the ratio of circulation quality with quality of steam is controlled at less than 300 to about 2 scope, from the logistics 230 that reboiler is discharged, producing less than 50%, more precisely less than 10% steam.The vapor absorption vaporization heat that forms in recycle stream, simultaneously, the temperature of the enriched material that do not allow to circulate in the interchanger 205 that boils again raises and surpasses about 1 °F, keeps the effective LMTD that does not have temperature to intersect.

The circulation enriched material is removed from 265 by pump 270 with the flow of control, and produces water 241 heat exchange with a part in 243.Before the interchanger 250 that enters heating, the production water 245 that the part of preheating is produced the preheating of water 244 and major portion merges.

If for the certain heavy oil drop, the amount of wasted energy 203 then provides the loop of independent compressor 305 and reboiler 315 less than the required production water 245 desired energy of distillation.Identical steam cycle amount is producing less than 50% through managing 350 logistics of discharging from reboiler 315 less than 300 to about 2, more precisely less than 10% steam.

Excessive steam 255 usefulness external condensation devices 355 condensations that in heated separator 250, produce.Energy can transmit and be used for the gain of heat or the heating of other suitable process.

Condensation flow logistics

320 and 360 is collected in the water of

condensation storage cylinder

325 and 365, uses pump 220,330 and 375 further to merge to form the distilled water recycle feed water of vapour generator 125.By using aforesaid method, can realize the water rate of recovery greater than 85%.

If in condensation process, in logistics 210,320 and 360, form incondensible volatile matter, then can pass through 217,335 and 370 automatic discharged steam respectively.

Can select working pressure and relevant temperature in the heated separator, to operate in the wide region from the perfect vacuum to 50psig, can to select more typical pressure be a little higher than or be lower than normal pressure, and the 12psia vacuum is to 2psig pressure.

Referring to Figure 13, be another variation scheme of the present invention.In this scheme, by using interchanger 400 and

blowback road

415 and 420, a part is used for crystallizer 405 from 200 waste thermal energy 202 and/or excess steam 255 as the energy.Crystallizer is operated under at least 10 boiling condition, wishes most between 20 °F to 30 °F, operates under the temperature that is lower than from the logistics of heated separator 250.Crystallizer can be operated being higher or lower than under the normal pressure.When the energy in wasted energy logistics 202 and/or the excess steam 255 surpasses the required energy of crystallizer operation, then can use the external condensation device to carry out condensation.

The concentration logistics 265 that separates that enriched material is discharged logistics 275 and heating is transfused to crystallization charging cylinder 280.Be transported in the crystallizer circulation loop 420 by fresh feed pump 425 near saturated brine.Shift out one loop slurry 410 and through solid/liquid separation apparatus 440 or be delivered directly to evaporation tank with pump 435.The typical solid/liquid separation apparatus that those skilled in the art are familiar with can be strainer, pressure filter, gravity settling tank, settler, wet cyclone, decantation cylinder and sedimentator.

Filtrate 450 loops back crystallizer charging storage cylinder 280.The solid materials 445 of discharging from solid/liquid separator 440 is collected in the suitable storage facilities, and sends to processing.Any polluted water that is collected in storage area 455 or evaporation tank can loop back in the crystallizer charging storage cylinder 280 by pump 460.

Water of condensation logistics 210,407 and 490 can collect and merge to form the distilled water recycle feed water of vapour generator 125.By using aforesaid method, can make the rate of recovery reach 100%, realize zero release.

At Figure 14, shown is another embodiment of the invention now, and wherein the high-level efficiency water-distillation unit by reference number 180 expressions is to be inserted in the loop, and locatees especially to be used to handle the water in any source, and for example local water is produced water or underground water.This variation can use all waste water sources from the SAGD loop to distill the water yield with the compensation that coupling requires in 100 places.In addition, this loop can comprise a water-softening plant by the routine of reference number 190 expressions, and it is used for the softening production water 175 that obtains from oil/water separator 165.Contained the TDS of equal amount or sodium-chlor and be to combine with distilled water by reference number 100 expressions by the production water of reference number 192 expression (it is softening and therefore do not have the hardness compound basically by device 190), 180 discharge to produce boiler feed water from water distilling apparatus.Distilled water 100 is to be substantially equal to leave the water loss of softening agent and at the 185 any ejectas from water distilling apparatus 180 by the sludge of reference number 195 expression from water-softening plant 190.

As an advantage in this loop, waste thermal energy can be by the cross hot brine of high pressure steam separator 130 at 140 places, the useless stream 163 of flash distillation, degassing separator 161 or also produce stream 160 by the heat of discharging from above-mentioned holder and realize.Wasted energy can provide by using appropriate thermal medium 166 and suitable heat exchanger 164.To recognize, and come the amount of the heat energy of bittern maybe all heats to be delivered to water distilling apparatus 180 by the heat adjustment of the comprehensive some or all of boiler feed water that go out from interchanger 120.Steam generator 125 (it can be several, but only illustrates one in the drawings) can be the known any suitable boiler of one skilled in the art, and the example is the dry drum boiler, straight through boiler, especially fluidized boiler.

With reference to Figure 15, another embodiment that shown is in the method shown in Figure 14.Figure 15 should be with reference to Figure 16, and wherein two kinds of method homogeneous phases are about high pressure steam 135.

With reference to Figure 15.A part of high pressure steam by reference number 150 expressions is to be introduced in the high-level efficiency water distilling apparatus 180 to drive water distilling apparatus 180.Can be recycled in the logistics 505 from holder 145, to discharge oil and water by reference number 510 waste streams (yes is under the reduction pressure with respect to high pressure steam 500).

With reference to Figure 16, the vapor recompression device that the front has been described can be increased by the SAGD method.This is by utilizing the high pressure steam of quoting in Figure 15 500 with the driving turbine by reference number 525 expressions.Conversely, turbine 525 is to be specially adapted to drive 305, and it is at being used to prevent that the loop of fouling from describing in front.

In one of the specially suitable advantage in the loop shown in Figure 16 is the following fact: a part of high pressure steam 135 (being illustrated as reference number 500 in Figure 15 again) is to be in such pressure, surpassed the required usually value of oil field injection condition (1900 and 2400psig between).This pressure surplus capacity is to be specially adapted to supply to drive energy to single stage turbine 525.It should be understood that the expression of turbine 525 in Figure 16 only is the signal of single turbine.But, it will be understood by those skilled in the art that character according to high pressure steam 500, can adopt the turbine of any number and type to realize this purpose.The pressure of the waste streams 530 of being discharged by steam turbine 525 is applicable to the oil field injection pressure, typically at acceptable 1200-1700psig pressure.The logistics that reduces pressure is by numeral 510 indications.All components among Figure 16 all has description at this paper with fore portion, Figure 16 is intended to describe the adaptive that high pressure steam is used to drive turbine, it has the additional advantage that reduces high pressure steam, thereby can be used for increasing not only at Figure 15 but also at the SAGD running gear shown in aforementioned other accompanying drawing of this paper.Therefore this has the advantage that reduces the whole service cost and develop efficiency.

With reference to Figure 17, this illustrates the associating of this paper above-mentioned good antiscale property loop and compression and turbine apparatus and further comprises a crystallization loop.

As mentioned above by the on-the-spot injection pressure of a part of the high pressure steam 135 of numeral 500 representatives between 1200psig-1700psig, its pressure reduced and be used to drive turbine 525, this turbine is drive compression machine 305 immediately.Control waste streams 530 is in low pressure (about 50psig) so that the thermal source of crystallization reboiler 400 to be provided.Typically the pressure steam flow 500 that is about the reduction pressure of 300-800psig is condensed into boiler supplying water 560 and returns the distilled water circulation by pump 570.Constituted the load of compressor 305 and turbine power subsequently requires and steam load 500 from the quality of distilled water of 250 evaporations.This quality that causes concentrating stream 265 is mated to be adapted at all the other water evaporation load of 470 crystallizer 405.Crystallizer 405 is used in particular for reducing and pollutes or dissolve the solid that the solid of producing in the water 175 becomes stream 445, and its separated device 440 separates.

Reboiler 400 is responsible for the condensation of steam turbine waste gas 545, consequently a quality and energy balance system, thus nearly all production water 175 is reclaimed as distilled water 100.A special advantage is, method of the present invention consumes the 20-30% of the normal steam demand of conventional distillation unit when using the single hop steam turbine, and if when using the high-efficiency multi-section steam turbine at the 10-20% that is its demand.

Figure 17 has integrated the energy balance advantage of good antiscale property evaporation circuit described herein and the multiple advantage in turbine/crystallizer loop, realized extremely effectively non-scaling distillation unit, this unit is self-contained, and reach almost 100% water recovery, and reduced insoluble compound until solid.

According to the equipment that can use in system, those skilled in the art can easily understand heated separator, preheater, reboiler, pump, compressor/gas blower, crystallizer etc. and be very important.Other improvement also is to understand easily without departing from the present invention.

Although invention has been described in front, the invention is not restricted to this, for a person skilled in the art, only otherwise break away from spirit, character and the scope of claim of the present invention, various improvement are clearly.

Claims

1. the method for a recovered energy is used for from the water of the oil bearing reservoir recovery heavy oil that contains heavy oil and water with processing, and this method may further comprise the steps:

A) provide the water feed stream;

B) handle described water feed stream to produce steam and liquid;

C) be provided for separating the vapour separator of described steam and described liquid;

D) separate described steam and described liquid;

E) provide oil-water separator and water distillation plant;

F) described steam is injected described oil bearing reservoir;

G) will be from heavy oil, production water and the steam decompression of described oil bearing reservoir;

H) by flash distillation energy contained in the described steam is transferred to described water distillation plant;

And

I) separate described heavy oil and production water;

J) handle described production water with described water distillation plant.

2. the process of claim 1 wherein that described water feed stream comprises underground water, local water and production water.

3. the process of claim 1 wherein that described heavy oil has 7 ° to 20 ° API value.

4. the process of claim 1 wherein, also comprise the step that contained heat energy in the described liquid is offered described water distillation plant.

5. the method for a recovered energy is used for from the water of the oil bearing reservoir recovery heavy oil that contains heavy oil and water with processing, and this method may further comprise the steps:

A) provide the water feed stream;

B) handle described water feed stream to produce steam and liquid;

D) separate described steam and described liquid;

E) provide degassing separator;

F) provide oil-water separator;

G) described steam is injected described oil bearing reservoir;

H) produce heavy oil, production water and waste material steam;

L) the contained heat energy of one of the following offers distillation plant at least: step h) described production water and waste material steam, the described liquid of step b) or step I) described waste material steam;

M) production water regulating step h); And

N) the water adjusted and distilation steps m of storage).

6. the method for claim 5, wherein, described water feed stream comprises underground water, local water and production water.

7. the method for claim 5 wherein, also comprises the step that interchanger and heat-transfer medium are provided, so that step I) heat of gained is delivered to described distillation plant.

8. the method for claim 5 is wherein, from step h) described heavy oil have 7 ° to 20 ° API value.

9. the method for claim 5, wherein, described heavy oil reclaims and comprises that steam assisted gravity oil extraction (SAGD) reclaims.

10. the method for claim 5, wherein, described heavy oil reclaims and comprises that cyclic steam excites (CSS) to reclaim.

11. the method for claim 5, wherein, described heavy oil reclaims and comprises that steam and gas propelling method (SAGP) reclaim.

12. the method for a recovered energy is used for from the water of the oil bearing reservoir recovery heavy oil that contains heavy oil and water with processing, this method may further comprise the steps:

A) provide the water feed stream;

B) handle described water feed stream to produce steam and liquid;

D) separate described steam and described liquid;

E) provide oil-water separator and water distillation plant;

F) described steam is injected described oil bearing reservoir;

H) separate described heavy oil and produce water from separator;

I) provide the heat energy that is contained in the liquid to the water distillation plant;

K) with described water distillation plant process for producing water.

13. the method for claim 12, wherein, step I) pressure that steam has described in is higher than and is injected into the required pressure of described oil bearing reservoir.

14. the method for claim 13, wherein, step I) pressure that steam has described in is suitable for being injected into described oil bearing reservoir.

15. the method for claim 13, wherein, described pressure is 1.31 * 10 ⁷-1.65 * 10 ⁷Between the Pa.

16. the method for claim 14, wherein, described pressure is 8.27 * 10 ⁶-1.17 * 10 ⁷Between the Pa.

17. the method for claim 12 wherein, heats described water feed stream with the heat energy of described liquid through interchanger.

18. the method for claim 12 is wherein, from step h) described heavy oil have 7 ° to 20 ° API value.

19. the method for claim 12, wherein, described heavy oil reclaims and comprises steam assisted gravity oil extraction (SAGD) recovery.

20. the method for claim 12, wherein, described heavy oil reclaims and comprises that cyclic steam excites (CSS) to reclaim.

21. the method for claim 12, wherein, described heavy oil reclaims and comprises that steam and gas propelling method (SAGP) reclaim.

22. a method that removes pollutent from the feed stream that contains pollutent, described feed stream are used for reclaiming heavy oil from the oil bearing reservoir that contain heavy oil, this method may further comprise the steps:

A) provide the water feed stream;

B) in heating steps, in the separator that has heated, heat described water feed stream, generate steam and the spissated liquid that contains pollutent;

C) the described steam of compression in compressor produces the temperature difference in the interchanger that boils again;

D) temperature difference in the described interchanger that boils again of control and the temperature of enriched material to keep nucleate boiling, wherein keep wet surface in the described interchanger that boils again;

E) at least a portion of described enriched material is circulated by described interchanger and the described separator that has heated of boiling again, the mass ratio that keeps enriched material and steam between 300-2, the resulting steam that leaves the interchanger that boils again less than 1 quality % extremely less than 50 quality %;

F) the described steam of condensation is collected distillate;

G) the concentrated liquid pollutent is added in the crystalline element, generate solid pollutant by the non-component of boiling in the liquid pollutant;

H) provide vapour generator;

J) provide steam turbine, and be connected, to drive described compressor with described compressor.

23. the method for claim 22, it also comprises step:

M) separate heavy oil and production water.

24. the method for claim 23, wherein, also comprise with step a) to f) corresponding, the step of handling described production water.

25. the method for claim 23, wherein, step I) pressure that steam has described in is higher than and is injected into the required pressure of described oil bearing reservoir.

26. the method for claim 25, wherein, the pressure of described exhaust steam is 8.27 * 10 ⁶-1.17 * 10 ⁷Between the Pa.

27. the method for claim 24, wherein, also comprise described exhaust steam by a solid crystal device, extracting energy contained in the described exhaust steam, in described crystallizer from be present in the described spissated liquid that contains pollutent and in the described steam, generate solid pollutant in nonvolatile compound.

28. the method for claim 27 wherein, also comprises from described steam the step of volatile components condense in the condenser.

29. the method for claim 27 is wherein, from step k) described heavy oil have 7 ° to 20 ° API value.

30. the method for claim 23 wherein, also comprises: with before described crystallizer contacts, the step that the pressure of described high pressure steam is reduced.