CN113250666B - Shallow heavy oil reservoir burning auxiliary steam huff and puff exploitation method - Google Patents
Shallow heavy oil reservoir burning auxiliary steam huff and puff exploitation method Download PDFInfo
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- CN113250666B CN113250666B CN202010086366.0A CN202010086366A CN113250666B CN 113250666 B CN113250666 B CN 113250666B CN 202010086366 A CN202010086366 A CN 202010086366A CN 113250666 B CN113250666 B CN 113250666B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses a shallow heavy oil reservoir fire-assisted steam huff and puff exploitation method. The shallow heavy oil reservoir fire-assisted steam huff and puff exploitation method comprises the following steps: establishing a fireflood auxiliary steam huff and puff group type huff and puff well pattern which comprises a plurality of fireflood auxiliary steam huff and puff units, wherein each fireflood auxiliary steam huff and puff unit comprises a fire huff and puff area arranged at the central position and a steam huff and puff area arranged around the fire huff and puff area; the fire-burning huff-puff area is provided with a plurality of fire-burning huff-puff vertical wells; the steam huff and puff area is provided with a plurality of steam huff and puff vertical wells; the fire huff and puff vertical wells are all used for implementing fire huff and puff, and the steam huff and puff is simultaneously implemented by the multiple steam huff and puff vertical wells; and after repeating for 2-3 times, all the multiple fire-burning huff-puff vertical wells are converted into continuous fire-flooding injection wells, and the multiple steam huff-puff vertical wells continue to perform steam huff-puff. The method is produced by using an in-situ combustion mechanism to assist steam huff and puff, and realizes the high-efficiency ignition of the shallow low-temperature low-pressure oil reservoir.
Description
Technical Field
The invention relates to the technical field of oil extraction in oil fields. And more particularly relates to a shallow heavy oil reservoir fire-assisted steam stimulation exploitation method.
Background
The yield of the domestic thick oil is still mainly steam huff and puff, about 50-60 percent, and the final huff and puff recovery ratio is 20-30 percent. Along with the increase of production turns, the utilization rate of heat energy is also gradually reduced, the steam huff and puff turns are generally higher than 10 turns and enter the later stage of steam huff and puff development, the steam huff and puff development is characterized by high steam injection amount in the injection process, and the extraction process is characterized by high water content, low oil production amount and low extraction-injection ratio. The throughput is 0.5-1 t/d, when the oil-gas ratio of production is lower than 0.1, production can be continued when the oil price is high, and when the oil price is in a low tide stage, a low yield well is difficult to economically and effectively develop.
The technology of the fire flooding oil layer is considered to be the most potential replacement technology of the oil deposit after steam huff and puff or steam flooding due to the advantages of high-temperature cracking modification, heating viscosity reduction, crude oil flow capacity improvement, high oil displacement efficiency, low energy consumption and the like. However, when the steam is taken in and taken out, the injection and production system is not matched with the fire flooding oil layer, a ground air compression injection system and a tail gas trapping and recovery system need to be built by investing a large amount of capital, and the technology is applied and has higher subsequent popularization cost.
After steam huffing and puff, the large-scale fire flooding conversion time is not mature, and an in-situ combustion is needed to be used as an important auxiliary production mode. CN101161987A proposes a process technology for heavy oil recovery by firing huff and puff, which adopts the injection of high temperature steam (340 ℃) and then injects proper combustion improver and air to ignite the stratum, and CN104265249 provides an oil recovery method by firing huff and puff, the ignition mode and production mode related to the method are mainly suitable for the original oil reservoir with buried depth (more than 1500 m). However, the initial pressure of the shallow heavy oil is generally lower than 3MPa, after the shallow heavy oil is huffed and puff for 10 rounds, the pressure of an oil reservoir is reduced to 0.5-0.7 MPa, the steam channeling among wells is serious during the huffing and puff, and the successful ignition of the low-temperature and low-pressure oil layer at the later period of the shallow huffing and puff is difficult to realize by using the conventional chemical method. After the key is broken by burning the thick oil at high temperature, hydrogen can be generated, so that the prevention of safety accidents in the underground unconsumed oxygen and hydrogen recovery process is also the focus of attention. In addition, the existing fire huff and puff technology cannot solve the problem of improving the recovery ratio in the later period of multiple rounds of steam huff and puff.
Therefore, the invention provides a shallow heavy oil reservoir fire assisted steam stimulation exploitation method to solve the problems.
Disclosure of Invention
The invention aims to provide a shallow heavy oil reservoir fire assisted steam huff and puff exploitation method, which is used for producing by utilizing an in-situ combustion mechanism to assist steam huff and puff, realizes high-efficiency ignition of a shallow low-temperature low-pressure reservoir, reduces the steam consumption during the huff and puff, improves the heat utilization efficiency at the later stage of steam huff and puff, ensures safe production during the technical implementation, and finally realizes the improvement of the recovery ratio of the reservoir steam huff and puff mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a shallow heavy oil reservoir fire-assisted steam huff and puff exploitation method comprises the following steps:
s1, establishing a fireflood auxiliary steam huff and puff collective huff and puff well pattern, wherein the fireflood auxiliary steam huff and puff well pattern comprises a plurality of fireflood auxiliary steam huff and puff units, and each fireflood auxiliary steam huff and puff unit comprises a fireflood huff and puff area arranged at the central position and a steam huff and puff area arranged around the fireflood huff and puff area; the fire-burning huff-puff area is provided with a plurality of fire-burning huff-puff vertical wells; the steam huff and puff area is provided with a plurality of steam huff and puff vertical wells;
s2, carrying out fire huff and puff on the plurality of fire huff and puff vertical wells, and carrying out steam huff and puff on the plurality of steam huff and puff vertical wells simultaneously;
and S3, repeating the step S2 for 2-3 rounds, converting the plurality of fire-burning huff-puff vertical wells into continuous fire-driving injection wells, and continuously performing steam huff-puff on the plurality of steam huff-puff vertical wells.
The shallow heavy oil reservoir fire-burning auxiliary steam huff and puff exploitation method provided by the invention has the advantages that the application range is expanded, an effective replacing mode is not available at the later huff and puff stage of oil reservoirs such as thin interbedded heavy oil, ultra-heavy oil and side bottom water heavy oil, and can be used as a huff and puff yield increasing mode or a subsequent technology replacing mode, and the final recovery ratio of the complex heavy oil is improved; the method greatly reduces the steam consumption, improves the production benefit at the later stage of huff and puff, and can still ensure economic and effective exploitation during the period of low oil price; the risk of single-direction live wire channeling is reduced by adopting a group-type fire huff and puff mode, and the oxygen-controlling and hydrogen-controlling slugs realize safe production in the process of recovery; the chemical agent ignition mode reduces the implementation difficulty of in-situ combustion technology, the formula of the high-efficiency ignition agent realizes low-temperature oxidation and rapid heat release, and the ignition success rate is improved.
Preferably, in step S1, the fired throughput zone and the steam throughput zone both have quadrilateral boundaries, and the quadrilateral boundaries of the fired throughput zone and the quadrilateral boundaries of the steam throughput zone have an arrangement that are staggered by an angle of 45 ° with each other, i.e., the quadrilateral boundaries of the fired throughput zone are staggered by an angle of 45 ° with the quadrilateral boundaries of the steam throughput zone.
Preferably, at least two rows of steam throughput vertical wells are arranged between the combustion throughput areas of two adjacent fireflood auxiliary steam throughput units in the step S1.
Preferably, the ratio of the number of fired through vertical wells in the fired through zone to the number of steam through vertical wells in the steam through zone in step S1 is 1: 4.
Preferably, in step S1, the fire-through area is provided with 5 fire-through vertical wells, and the steam-through area is provided with 20 steam-through vertical wells.
Preferably, in step S2, the multiple straight wells for fire-through stimulation are all subjected to fire-through stimulation, and the multiple straight wells for steam-through stimulation are all subjected to steam stimulation, specifically including the following steps:
s201, injecting steam into the multi-port fire-burning huff-puff vertical well, recovering the pressure of an oil layer to 1.0-2.0 MPa, and recovering the temperature of a near wellbore zone to more than 190 ℃;
s202, injecting an ignition agent into the stratum of the multi-port steam huff-puff vertical well, replacing the ignition agent with steam of 50 t-100 t to the deep part of the stratum, and then injecting steam required by steam huff-puff into the multi-port steam huff-puff vertical well and stewing the steam;
s203, injecting air into the multiple in-situ combustion huff and puff vertical wells simultaneously, and keeping the temperature of an underground in-situ combustion oil layer at 400-450 ℃;
s204, injecting an oxygen-controlling and hydrogen-controlling slug, injecting the organic acid manganese solution into the stratum by using steam, and stewing for 3-5 days in a vertical well by burning;
s205, simultaneously producing back the plurality of fire-burning huff-puff vertical wells and the plurality of steam huff-puff vertical wells.
Preferably, in step S201 and step S202, the injection amount of steam of the single steam through vertical well is obtained by formula (I):
Qs＝0.04πr2h (I)；
in the formula (I), QsThe steam injection amount of the single-opening steam huff and puff vertical well is expressed in unit of t;
the value of pi is 3.14, and the dimension is not large;
r represents the steam throughput radius in m;
h represents the oil layer thickness in m.
Preferably, the ignition agent in step S202 includes crude oil, castor oil, paraffin, and manganese organic acid.
Preferably, the volume ratio of the crude oil, the castor oil and the paraffin in the ignition agent is 1:1:0.05, and the dosage of the organic acid manganese is 3 vol% -5 vol% of the total volume of the crude oil, the castor oil and the paraffin.
Preferably, the total injection amount of air in step S203 is obtained by formula (II):
Qair＝πr0 2hP(T+273)/29.3 (II)；
in the formula (II), QairDenotes the total injection of air in sm3；
The value of pi is 3.14, and the dimension is not large;
r0represents the radius of the combustion zone in m;
h represents the oil layer thickness in m;
p represents the formation pressure in MPa;
t represents the average temperature of the reservoir after combustion in c.
Preferably, the injection amount of the steam-carried organic acid manganese solution in the step S204 is 2 wt% to 5 wt% of the total amount of the injection slug.
The invention has the following beneficial effects:
(1) the mining method provided by the invention simplifies the technical application difficulty and cost requirement of in-situ combustion: compared with the prior steam huff and puff, the invention can eliminate the steam injected in the early stageSteam, heat, steam and flue gas are directly generated underground in the subsequent in-situ combustion process, so that the problem of insufficient pressure and energy in the later period of multiple times of huffing and puff is solved; flue gas contains a large amount of N2With CO2The oil reservoir has the functions of dissolving and reducing viscosity, and field practice shows that when the temperature at the last stage of huffing and puff of the implemented low-viscosity heavy oil reservoir is reduced to 70 ℃, the displacement pressure loss is increased due to the low-temperature heavy oil, the heavy oil in the near-wellbore zone is difficult to effectively recover under the low-temperature condition, and CO is generated2The viscosity reduction effect of the solvent reduces the lower temperature limit of huff and puff to 40-50 ℃, and improves the fluidity of the crude oil under the low-temperature condition; in addition, the flue gas has the function of supplementing the formation energy, the gas partial pressure action improves the reservoir pressure of failure type huff and puff development, and the dissolved steam flooding action in the huff and puff recovery stage can prolong the huff and puff production period. Compared with the conventional single fire huff and puff technology, the total heat generated by underground high-temperature combustion is still limited, and is not enough to support the heat demand at the later stage of multiple rounds of steam huff and puff, the total amount of steam injected in the whole stage effectively ensures the rapid rise of the oil reservoir temperature, and meanwhile, the reasonable steam injection amount and air amount are beneficial to the effect of underground emulsification and viscosity reduction, so that the difficulty of liquid flowback caused by overlarge gas saturation in the production process is avoided; the method can reduce the steam consumption at the later stage of steam huff and puff by 50-70%, improve the yield during the huff and puff, improve the production benefit at the later stage of the huff and puff and improve the production effect under a high huff and puff turn;
(2) the mining method provided by the invention provides a chemical ignition mode of an efficient low-temperature low-pressure oil reservoir: the lower limit of the ignition temperature of the existing chemical ignition system is 230 ℃, and when the ignition temperature is lower than the lower limit of the ignition temperature, the one-time success rate of ignition is greatly reduced; after the oil deposit supplements energy at the later stage of the shallow oil deposit huff and puff, the temperature can be increased to 200 ℃, in order to realize high-efficiency ignition at the temperature range of 190-230 ℃, the researched composite ignition agent is combined with air, and can quickly generate heat and increase the temperature of the oil deposit at the low-temperature stage, so that the low-temperature oil deposit can be successfully ignited; the ignition method provided by the invention injects the ignition agent and then spreads the ignition agent over the used area of a single well, the radius of a combustion zone is improved to 20 m-25 m, the crude oil in an affected area is modified at high temperature under high-temperature combustion, and the fluidity in the later-stage flowback process is improved;
(3) the mining method provided by the invention improves the production safety: the invention provides a method for improving the quality of heavy oil by using organic acid manganese solution, which comprises the following steps of injecting steam carrying the organic acid manganese solution into a stratum, injecting the steam to drive shaft air to the stratum, and carrying out high-temperature oxidation hydrogenation catalytic modification on underground heavy oil under the action of the organic acid manganese under the high-temperature condition, wherein the viscosity of an oil reservoir is further reduced, and underground residual oxygen and hydrogen are fully consumed, so that the operation safety is guaranteed;
(4) the mining method provided by the invention has the advantages that the recovery ratio is obviously improved: in the earlier stage, the group type operation is simultaneously realized by adopting the central well group, and the simultaneous operation of a plurality of wells is beneficial to improving the temperature and the pressure of a local oil reservoir in a large scale, so that the influence of a steam channeling channel caused by steam huffing and puff secondary can be avoided, and the number of effective wells and the success rate are improved; and 2-3 rounds of later-period huffing and puff are performed, the central well adopts a continuous fireflood mode, the peripheral production wells adopt a steam huffing and puff mode, the integration of a fireflood technology and a steam huffing and puff technology is realized, the continuous air injection of the fireflood well promotes the continuous expansion of a fireflood leading edge zone, sufficient energy and flue gas provided by underground combustion create conditions for the flow of crude oil between wells, a large amount of crude oil is extracted from the steam huffing and puff well under the fireflood effect, and finally the high recovery ratio under the fireflood auxiliary steam huffing and puff condition is realized.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of a fire flooding assisted steam huff-and-puff collective huff well pattern in embodiment 2 of the invention;
wherein, the system comprises a 1-burning huff and puff area, a 2-steam huff and puff area, a 3-burning huff and puff vertical well and a 4-steam huff and puff vertical well.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1
The embodiment provides a method for exploiting a shallow heavy oil reservoir by combustion-assisted steam huff and puff, which is characterized in that a certain block of a Xinjiang oil field is taken as an example, the block is a shallow extra-heavy oil conglomerate reservoir, the reservoir burial depth is 250m, the original average formation pressure is 2.5MPa, the formation temperature is 15 ℃, the effective thickness of an oil layer is 15m, the porosity is 32.2%, the permeability of the oil layer is 200 mD-1300 mD, the oil saturation is 60-68%, and the average crude oil viscosity at the temperature of 50 ℃ is 800 mPa.s-2500 mPa.s; a plurality of vertical wells are deployed in the oil reservoir, the well spacing of the vertical wells is 50m, the steam huff-puff production turns are 12 to 16, 2200t steam is injected averagely in the last stage, 200t oil is produced in a single turn, and the oil-steam ratio is reduced to be below the economic limit.
(1) And preferably selecting a high-round huff and puff well, wherein the oil reservoir meets the screening standard of the fire-burning auxiliary steam huff and puff technology: the huffing and puff turns are more than 10 turns, the output degree of a single well is less than 30 percent, and the viscosity of crude oil is less than 20000 mPa.S.
(2) Establishing a fireflood auxiliary steam huff and puff group type huff and puff well pattern which comprises 4 fireflood auxiliary steam huff and puff units, wherein each fireflood auxiliary steam huff and puff unit comprises a fire huff and puff area arranged at the central position and a steam huff and puff area arranged around the fire huff and puff area; the quadrilateral boundary of the fire huff and puff area and the quadrilateral boundary of the steam huff and puff area are staggered by an angle of 45 degrees; the fire-burning huff-puff area is provided with 5 fire-burning huff-puff vertical wells; the steam huff and puff area is provided with 20 steam huff and puff vertical wells;
injecting steam into 5 fire-burning huff-puff vertical wells at the middle position of each fire-driving auxiliary steam huff-puff unit for 800t, recovering the pressure of an oil layer to 1.0MPa, and recovering the temperature of a near-wellbore area to 190 ℃;
(3) injecting 5t of an ignition agent into the stratum of the 5 fire huff and puff vertical wells in the middle of each fire-flooding auxiliary steam huff and puff unit, replacing 50t of steam into the deep part of the stratum, injecting 2000t of steam consumption needed by steam huff and puff into the 20 steam huff and puff vertical wells around each fire-flooding auxiliary steam huff and puff unit, and stewing; the ignition agent is prepared by mixing crude oil, castor oil, paraffin and organic acid manganese, wherein the volume ratio of the crude oil to the castor oil to the paraffin is 1:1:0.05, and the consumption of the organic acid manganese is 5% of the total volume of the crude oil to the castor oil to the paraffin;
(4) simultaneously injecting air into the 5 fire-burning huff-puff vertical wells at the middle position of each fire-driving auxiliary steam huff-puff unit, wherein the total air injection amount is 40 multiplied by 104sm3Keeping the temperature of an underground in-situ combustion oil layer at 190-210 ℃;
(5) injecting oxygen-controlling and hydrogen-controlling slugs subsequently, injecting steam and organic acid manganese solution slugs for 50t, and putting into production after 5 days of vertical well soaking of 5 ports of fire huff and puff in the middle of each fire-flooding auxiliary steam huff and puff unit; and steam huffing is adopted for 20 vertical wells around each fireflood auxiliary steam huffing unit.
(6) Before the implementation, the steam huff and puff is carried out for a single time of 2000t, and the daily oil production is 0.2-0.7 t/d. After the implementation, oil increment is accumulated in a period 1503t, the production validity period of the well is prolonged from 150 days to 200 days by implementing burning auxiliary steam huff-puff, the daily oil production is 3.0t/d, the accumulated oil production is 612t, the average water content is 75.3 percent, and oil increment is carried out on three effective steam huff-puff wells around 812 t.
Example 2
The embodiment provides a numerical simulation research test of a certain oil field, adopts CMG thermal recovery thickened oil numerical simulation software, and predicts and compares the application effect of steam huff and puff and fireflood auxiliary steam huff and puff technology in the test, and the parameters are set as follows:
basic oil deposit parameters: the oil reservoir buried depth is 200m, the porosity is 30%, the oil saturation is 65%, the net-to-wool ratio is 0.5, the horizontal permeability is 800mD, the vertical permeability is 400mD, the oil layer thickness is 15m, the temperature is 15 ℃, and the viscosity is 8000mPa.s under the oil reservoir temperature condition;
injection-production yield in the steam huff-puff stage: the dryness of steam at the bottom of a well is 65%, the maximum injection pressure of the steam is 4MPa, the injection amount of the steam in a single round is 1200-2500 t, the injection amount is increased by 10% in each round, and the oil-steam ratio under the production cut-off condition is lower than 0.08;
injection-production parameters in the stage of steam stimulation assisted by burning: dryness of steam at well bottom65 percent, the steam injection amount of the burning well is 600 t/wheel, the injection amount of the ignition agent for a single well is 2 t/time, and the air injection amount is 5000-20000 sm3(d) single-round air injection amount of 30-60 multiplied by 104sm3；
Injection-production parameters of the fireflood auxiliary steam huff-puff stage: 10000-20000 sm for air injection amount of fireflood well3D, injecting steam into the steam huff-puff well in a single round and a single round at 1000t, continuously injecting gas into the fireflood well, and producing the steam huff-puff well in 150 days per round;
basic parameters of a well pattern: a square regular well pattern, which comprises 4 fireflood auxiliary steam throughput units, wherein the well spacing is 50m, and each fireflood auxiliary steam throughput unit comprises 25 vertical wells in total, as shown in figure 1; wherein, the burning huff and puff area is provided with 5 burning huff and puff vertical wells, and the steam huff and puff area is provided with 20 steam huff and puff vertical wells.
The simulation result shows that:
(1) when the steam throughput is only considered in the model, the maximum effective production period is 14 rounds, the oil production amount of a single round in the last production period is 0.5t/d, the effective production period is 2100d, and the recovery ratio is 25%;
(2) when the model considers the burning auxiliary steam huff and puff operation, the well pattern and the operation parameters are changed from the 15 th round to the scheme design requirements, the effective production can be carried out for more than 10 years, the effective daily oil production of a single well is 1.0t/d, and the effective production ultimate recovery rate is 65%.
In conclusion, the invention provides a shallow heavy oil reservoir fire-assisted steam huff-and-puff mining method, which comprises the steps of firstly establishing a fire-flooding assisted steam huff-and-puff group huff-and-puff well network, simultaneously implementing fire-flooding assisted steam huff-and-puff for a plurality of vertical wells in the center, and implementing steam huff-and-puff for adjacent wells on the periphery; injecting a certain amount of steam to raise the temperature of the oil reservoir, injecting crude oil, castor oil, paraffin and organic acid manganese synthetic ignition agent to realize low-temperature ignition, and subsequently injecting oxygen-controlling and hydrogen-controlling slugs to inject steam and organic acid manganese; and (4) continuously burning for assisting steam to huff and puff for 2-3 rounds, converting the steam into continuous fireflood of the central well, and huffing and puffing steam of surrounding adjacent wells for production.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. A shallow heavy oil reservoir fire-assisted steam huff and puff exploitation method is characterized by comprising the following steps:
s1, establishing a fireflood auxiliary steam huff and puff collective huff and puff well pattern, wherein the fireflood auxiliary steam huff and puff well pattern comprises a plurality of fireflood auxiliary steam huff and puff units, and each fireflood auxiliary steam huff and puff unit comprises a fireflood huff and puff area arranged at the central position and a steam huff and puff area arranged around the fireflood huff and puff area; the fire-burning huff-puff area is provided with a plurality of fire-burning huff-puff vertical wells; the steam huff and puff area is provided with a plurality of steam huff and puff vertical wells;
s2, carrying out fire huff and puff on the plurality of fire huff and puff vertical wells, and carrying out steam huff and puff on the plurality of steam huff and puff vertical wells simultaneously;
and S3, repeating the step S2 for 2-3 rounds, converting the plurality of fire-burning huff-puff vertical wells into continuous fire-driving injection wells, and continuously performing steam huff-puff on the plurality of steam huff-puff vertical wells.
2. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 1, wherein the fire stimulation region and the steam stimulation region in step S1 are both provided with quadrilateral boundaries, and the quadrilateral boundaries of the fire stimulation region and the quadrilateral boundaries of the steam stimulation region are arranged at an angle of 45 degrees staggered with each other.
3. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 2, wherein at least two rows of steam stimulation vertical wells are arranged between the fire stimulation areas of two adjacent fire-assisted steam stimulation units in the step S1.
4. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 3, wherein the ratio of the number of fire stimulation vertical wells in the fire stimulation zone to the number of steam stimulation vertical wells in the steam stimulation zone in step S1 is 1: 4.
5. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 4, wherein in the step S1, the fire stimulation zone is provided with 5 fire stimulation vertical wells, and the steam stimulation zone is provided with 20 steam stimulation vertical wells.
6. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method according to any one of claims 1 to 5, wherein in step S2, the multiple fire-stimulation vertical wells are all subjected to fire stimulation, and simultaneously the multiple steam-stimulation vertical wells are all subjected to steam stimulation, and the method specifically comprises the following steps:
s201, injecting steam into the multi-port fire-burning huff-puff vertical well, recovering the pressure of an oil layer to 1.0-2.0 MPa, and recovering the temperature of a near wellbore zone to more than 190 ℃;
s202, injecting an ignition agent into the stratum of the multi-port steam huff-puff vertical well, replacing the ignition agent with steam of 50 t-100 t to the deep part of the stratum, and then injecting steam required by steam huff-puff into the multi-port steam huff-puff vertical well and stewing the steam;
s203, injecting air into the multiple in-situ combustion huff and puff vertical wells simultaneously, and keeping the temperature of an underground in-situ combustion oil layer at 400-450 ℃;
s204, injecting an oxygen-controlling and hydrogen-controlling slug, injecting the organic acid manganese solution into the stratum by using steam, and stewing for 3-5 days in a vertical well by burning;
s205, simultaneously producing back the plurality of fire-burning huff-puff vertical wells and the plurality of steam huff-puff vertical wells.
7. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 6, wherein in the step S201 and the step S202, the injection amount of the steam of the single-steam stimulation vertical well is respectively obtained by the formula (I):
Qs＝0.04πr2h (I)；
in the formula (I), QsThe steam injection amount of the single-opening steam huff and puff vertical well is expressed in unit of t;
the value of pi is 3.14 and is dimensionless;
r represents the steam throughput radius in m;
h represents the oil layer thickness in m.
8. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 6, wherein the ignition agent in the step S202 comprises crude oil, castor oil, paraffin and manganese organic acid; the volume ratio of the crude oil, the castor oil and the paraffin in the ignition agent is 1:1:0.05, and the dosage of the organic acid manganese is 3 vol% -5 vol% of the total volume of the crude oil, the castor oil and the paraffin.
9. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 6, wherein the total injection amount of the air in the step S203 is obtained by the formula (II):
Qair＝πr0 2hP(T+273)/29.3 (II)；
in the formula (II), QairRepresents the total injection amount of air in sm3；
The value of pi is 3.14 and is dimensionless;
r0represents the radius of the combustion zone in m;
h represents the oil layer thickness in m;
p represents the formation pressure in MPa;
t represents the average temperature of the reservoir after combustion in c.
10. The shallow heavy oil reservoir fire-assisted steam stimulation recovery method as claimed in claim 6, wherein the injection amount of the steam-carried organic acid manganese solution in the step S204 is 2-5 wt% of the total amount of the injection slug.
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