CN116927734B - Method for improving exploitation efficiency of oil reservoir microorganism cold level - Google Patents
Method for improving exploitation efficiency of oil reservoir microorganism cold level Download PDFInfo
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Classifications
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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
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention discloses a method for improving the exploitation efficiency of oil reservoir microorganism cold bits, which comprises the following steps: determining the plugging radius of a water channeling channel of oil reservoir exploitation according to the oil well extraction degree and the steam channeling characteristics; according to the plugging radius, the water channeling channels are deeply plugged, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance; stopping the pump for 5min after plugging, and stabilizing the pressure of the pump at 2.5MPa so as to ensure that residual oil forms a wave in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection. After the high-permeability water channeling channels around the injection well are plugged, the microbial displacement sweep range can be increased, the probability of contact between microorganisms and stratum residual oil is increased, and the utilization degree of the residual oil is increased.
Description
Technical Field
The invention relates to the technical field of oil gas exploitation, in particular to a method for improving oil reservoir microorganism cold-spot exploitation efficiency.
Background
The thick oil has multiple types and complex formation and is influenced by high seepage difference of viscosity of the thick oil, the thick oil is a mixture of various hydrocarbon compounds, the difference of viscosity of the thick oil is larger due to different structural differences and contents of colloid, wax and asphaltene, and an effective cold-position exploitation development technology adapting to geology is not formed.
At present, thick oil is developed mainly by adopting thermal recovery technologies such as overseas mature steam huff and puff or steam assisted gravity drainage technology (SAGD technology for short) and the like, and the risks of low efficiency, steam reservoir injury and the like caused by high steam preparation energy consumption and steam channeling exist, so that high carbon emission generated by large-scale steam development also does not meet the environmental protection requirement.
The microbial cold-spot exploitation is an important oil extraction technical direction in the prior art, in the process of thick oil steam injection thermal recovery, a water channeling channel exists in a reservoir layer due to large defect and steam channeling, the residual oil is little due to the strong ablation effect of steam in the process of forming the water channeling channel, in the process of microbial cold-spot exploitation, injected microbial agents and nutrient substances grow and diffuse along the scale of the water channeling channel, and are difficult to contact with residual oil which is not used by the steam, so that the degradation effect of the microbes on the thick oil is difficult to embody, in the process of thick oil steam injection thermal recovery, the residual oil is mainly enriched among oil wells due to the influence of the steam effect, the bacteria and the abundance of different areas are different, and the original displacement well pattern is difficult to meet the condition of microbial cold-spot exploitation.
Disclosure of Invention
In view of the foregoing, the present invention has been made to provide a method for improving the efficiency of cold-spot recovery of oil reservoir microorganisms that overcomes or at least partially solves the foregoing problems.
According to one aspect of the invention, a method for improving the exploitation efficiency of cold spots of oil deposit microorganisms is provided, comprising the following steps:
step 1: determining the plugging radius of a water channeling passage of an oil well for oil reservoir exploitation according to the oil well extraction degree and the steam channeling characteristics;
step 2: according to the plugging radius, the water channeling channels are deeply plugged, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance;
step 3: stopping the pump for 5min after plugging, wherein the pressure of stopping the pump is stabilized at 2.5MPa so as to ensure that residual oil is formed in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection, and the step 4: dividing three temperature ranges according to the historical shut-in well region well opening production temperature, and dividing the oil well into a first temperature range, a second temperature range and a third temperature range according to the three temperature ranges; the method comprises the steps of determining the type and the abundance of microorganism bacteria in an oil reservoir in the oil well type under three temperature ranges, wherein the third temperature range is determined according to the temperature of the oil reservoir; the lowest temperature of the first temperature range is higher than the highest temperature of the second temperature range; the lowest temperature of the second temperature range is higher than the highest temperature of the third temperature range;
step 5: separating thick oil from produced liquid of an oil well corresponding to a third temperature range, and respectively selecting asphalt degrading bacteria, heteroatom compound degrading bacteria, desulfurizing bacteria, denitrifying bacteria, carbon fixing bacteria and a culture medium which are screened indoors for culture to determine the type of functional microorganism bacteria with the highest degradation degree of the thick oil, the strongest emulsifying capacity of metabolic products and the targeting property of the culture medium;
step 6: taking the produced liquid of the oil well corresponding to the first temperature range, the produced liquid of the oil well corresponding to the second temperature range and the produced liquid of the oil well corresponding to the third temperature range as base liquids respectively, adding the functional microorganism bacteria and the target culture medium screened in the step 5 into a shaking table for 7 days, analyzing the microorganism species types and the abundance in the produced liquid of the oil well corresponding to the three temperature ranges, adjusting the concentration and the composition of the target culture medium, and selecting the concentration of the functional microorganism bacteria to be more than 1 multiplied by 10 8 cfu/ml, wherein a culture medium with abundance of more than 60% is a targeting culture medium;
step 7: according to the distribution characteristics of the residual oil, the flooding well pattern is adjusted, well pattern combination is carried out by taking the driving between oil wells as a principle, and the functional microorganism in the step 6 is fermented in a target culture medium until the concentration of the bacterial liquid reaches 1 multiplied by 10 10 cfu/ml, and then injecting the fermented bacterial liquid into a flooding well pattern for well-flushing operation.
Further, step 1 further comprises:
aiming at the oil reservoir recovery degree of more than 35 percent and prompting frequent steam channeling during steam injection, the plugging radius is 20-25m;
aiming at the oil reservoir recovery degree less than 35% and prompting frequent steam channeling during steam injection, the plugging radius is 15-20m;
aiming at the fact that the oil reservoir recovery degree is more than 35%, the steam channeling frequency is not prompted during the steam injection period, and the plugging radius is 15-20m;
the plugging radius is 10-15m for the situation that the oil reservoir recovery degree is less than 35% and the steam channeling is not indicated to be frequent during the steam injection period.
Further, the well-stewing operation is specifically as follows: if the viscosity of the underground crude oil reservoir is 200-1000mPa.s, the well is stewed for 7-30 days; if the viscosity of the underground crude oil reservoir is 1000-5000 Pa.s, the well is stewed for 30-100 days; if the viscosity of the underground crude oil reservoir is 5000-20000 Pa.s, the well is stewed for 100-120 days.
Further, the method comprises the step 8: the ground gathering and transporting system is regulated, the produced liquid of the oil well corresponding to the three temperature ranges is tested, the concentration of the functional microorganism bacteria and the abundance of the functional microorganism bacteria are obtained, when the concentration of the functional microorganism bacteria is lower than 1 multiplied by 10 6 When cfu/ml and/or the abundance of functional microorganism is lower than 60%, supplementing the functional microorganism and the targeting culture medium to the concentration of bacterial liquid of 1 multiplied by 10 8 cfu/ml and reinjected back into the well.
Further, both the functional microorganism and the targeting medium use water as a carrier.
Further, the water channeling is determined based on the already formed water channeling and the deficit volume in the well.
According to the method for improving the exploitation efficiency of the oil reservoir microorganism cold spot, the plugging radius of a water channeling channel in oil reservoir exploitation is determined according to the oil well exploitation degree and the steam channeling characteristics; according to the plugging radius, the water channeling channels are deeply plugged, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance; stopping the pump for 5min after plugging, and stabilizing the pressure of stopping the pump at about 2.5MPa so as to ensure that residual oil forms a wave in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection. After the high-permeability water channeling channels around the injection well are plugged, the microbial displacement sweep range can be increased, the probability of contact between microorganisms and stratum residual oil is increased, and the utilization degree of the residual oil is increased.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below, however, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment provides a method for improving the exploitation efficiency of oil reservoir microorganism cold bits, which comprises the following steps of 1-8:
step 1: and determining the plugging radius of the water channeling passage of the oil well for oil reservoir exploitation according to the oil well extraction degree and the steam channeling characteristics.
Specifically, aiming at the oil reservoir recovery degree of more than 35% and prompting frequent steam channeling during steam injection, the plugging radius is 20-25m; aiming at the oil reservoir recovery degree less than 35% and prompting frequent steam channeling during steam injection, the plugging radius is 15-20m; aiming at the fact that the oil reservoir recovery degree is more than 35%, the steam channeling frequency is not prompted during the steam injection period, and the plugging radius is 15-20m; the plugging radius is 10-15m for the situation that the oil reservoir recovery degree is less than 35% and the steam channeling is not indicated to be frequent during the steam injection period.
Step 2: and (3) deep plugging is carried out on the water channeling channels according to the plugging radius, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance.
Step 3: stopping the pump for 5min after plugging, and stabilizing the pressure of stopping the pump at about 2.5MPa so as to ensure that residual oil forms a wave in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection.
The method is highly influenced by the extraction degree of an oil well in oil reservoir exploitation, the utilization degree of the surrounding of the near well of an injection well is high, and the formed steam channeling condensate water channel (namely, a water channeling channel) and the defect volume are required to be plugged from the viewpoints of improving the probability of contact of microorganisms with crude oil and improving the displacement efficiency of subsequent microorganisms.
The reverse five-point well pattern is adopted through simulation, microbial pretreatment and reinjection displacement are directly carried out on a reinjection well of the reverse five-point well pattern, reinjection displacement effect prediction comparison is carried out on two schemes of blocking a high-utilization oil layer near a near well of an injection well, simulation results show that after a water channeling channel around the injection well is blocked, the microbial displacement sweep range can be improved, the probability of contact between microorganisms and stratum residual oil is improved, the utilization degree of the residual oil is improved, and the saturation of the residual oil of each layer of cold-position exploitation of the adopted blocked microorganisms is lower than that of a non-blocking model, so that the displacement production effect is better.
Step 4: dividing three temperature ranges according to the historical shut-in well region well opening production temperature, and dividing the oil well into a first temperature range, a second temperature range and a third temperature range according to the three temperature ranges; the method comprises the steps of determining the type and the abundance of microorganism bacteria in an oil reservoir in the oil well type under three temperature ranges, wherein the first temperature range represents a high steam utilization condition in steam injection exploitation, the second temperature range represents a medium steam utilization condition, the third temperature range represents a weak steam utilization condition.
Wherein the third temperature range is determined according to the temperature of the oil reservoir itself; because the temperature of the oil reservoir is affected by the ambient temperature, the temperature range of the oil reservoir is about 30-40 ℃ in summer, and the temperature range of the oil reservoir is about 10-20 ℃ in winter; the lowest temperature of the first temperature range is higher than the highest temperature of the second temperature range; the lowest temperature of the second temperature range is higher than the highest temperature of the third temperature range; that is, the third temperature range in summer may be set to [ 30 to 40 degrees ]; the second temperature range may be set to 41 degrees to 50 degrees; the first temperature range may be set to [ 51 degrees to 60 degrees ].
Step 5: separating thick oil from produced liquid of the oil well corresponding to the third temperature range, and respectively selecting the asphalt degrading bacteria, heteroatom compound degrading bacteria, desulfurizing bacteria, denitrifying bacteria, carbon fixing bacteria and culture medium which are screened indoors to culture, thereby determining the type of functional microorganism bacteria with the highest degradation degree of the thick oil, the strongest emulsifying capacity of metabolic products and the targeting property of the culture medium.
Step 6: taking the produced liquid of the oil well corresponding to the first temperature range, the produced liquid of the oil well corresponding to the second temperature range and the produced liquid of the oil well corresponding to the third temperature range as base liquids respectively, adding the functional microorganism bacteria and the target culture medium screened in the step 5 into a shaking table for 7 days, analyzing the microorganism species types and the abundance in the produced liquid of the oil well corresponding to the three temperature ranges, adjusting the concentration and the composition of the target culture medium, and selecting the concentration of the functional microorganism bacteria to be more than 1 multiplied by 10 8 cfu/ml, and the culture medium with the abundance of more than 60% is a targeting culture medium.
Step 7: according to the distribution characteristics of the residual oil, the flooding well pattern is adjusted, well pattern combination is carried out by taking the driving between oil wells as a principle, and the functional microorganism in the step 6 is fermented in a target culture medium until the concentration of the bacterial liquid reaches 1 multiplied by 10 10 cfu/ml, and then injecting the fermented bacterial liquid into a flooding well pattern for well-flushing operation.
In an alternative way, the well-logging operation is specifically: if the viscosity of the underground crude oil reservoir is 200-1000mPa.s, the well is stewed for 7-30 days; if the viscosity of the underground crude oil reservoir is 1000-5000 Pa.s, the well is stewed for 30-100 days; if the viscosity of the underground crude oil reservoir is 5000-20000 Pa.s, the well is stewed for 100-120 days.
According to the results of an indoor experiment and physical simulation of a crude oil activation system of a heavy oil reservoir, as the time of soaking a well is prolonged, the emulsifying and viscosity reducing capacity of the crude oil is enhanced, the components of the crude oil are converted from high carbon chains to low carbon chains, the average molecular weight is reduced, and the viscosity reduction degree of the crude oil is gradually increased; physical simulation oil displacement results show that the longer the well-stewed time is, the better the microbial oil displacement effect is, for example, when the well-stewed time is about 60 days, the microbial cold recovery ratio can reach 23.08%; in this embodiment, the time of soaking is designed to be about 2 months in consideration of the difference between the formation condition and the experimental condition, and the actual time of starting the well is determined according to the wellhead pressure of the oil well and the gas production change.
In an alternative way, the method further comprises step 8: adjusting the ground gathering and transporting system to test the produced liquid of the oil well to obtain the functional microorganismWhen the concentration of the functional microorganism is less than 1×10 6 When cfu/ml and/or the abundance of functional microorganisms is lower than 60%, supplementing the functional microorganisms and the targeting culture medium to the concentration of bacterial liquid of 1 multiplied by 10 8 cfu/ml and reinjected back into the well.
In an alternative, both the functional microorganism and the targeting medium are water-borne.
The thickened oil microbial cold-position exploitation technology (hereinafter referred to as cold exploitation technology) is an enhanced oil exploitation mode which is carried out by injecting directionally screened microbe bacteria capable of degrading thickened oil and an activation system or a high-efficiency biological agent corresponding to the microbe bacteria into an oil well, and acting the thickened oil of the oil well through internal and external microbes and metabolites produced by the microbes, wherein the main action mechanism is as follows:
(1) the microorganism with the function of degrading the heavy oil hydrocarbon can decompose the hydrocarbon with larger molecular weight in the heavy oil and release CO 2 、CH 4 、N 2 、H 2 After the action of the gas and hydrocarbon degrading microorganisms, the average molecular weight of the thick oil is reduced, and meanwhile, the released gas is partially dissolved in the thick oil to reduce the viscosity of the crude oil and improve the fluidity of the thick oil;
(2) in the process of activating and culturing the internal and external microorganisms, part of microorganisms can metabolize amphiphilic surfactants with surface activity, such as rhamnolipid, sophorolipid and the like, and the surfactants can reduce the viscosity of thick oil by emulsifying the thick oil, so that the flowing ability of the thick oil in a stratum is enhanced;
(3) micro-molecular acid can be metabolized in the stratum propagation process by the microorganisms, so that stratum rock and stratum cement can be dissolved, and the stratum permeability can be improved.
Research and field practice prove that the degradation of the microorganism on the thick oil and the emulsifying property of the metabolite thereof are important mechanisms for realizing cold recovery of the thick oil, the contribution of the hydrocarbon degradation capability and the emulsifying capability of the metabolite thereof to the fluidity of the thick oil is higher than the contribution to the viscosity reduction, and the substantial improvement of the fluidity is the main characteristic of the effect of the cold recovery of the thick oil microorganism.
In the field of microbial cold recovery, a microbial strain 320 related to oil recovery has been established, and in this example, 1-2 strain and 6-2 strain are selected; the 1-2 strain is hydrocarbon degrading bacteria which are extracted from oil reservoirs in a third temperature range and are sensitive to thickened oil asphaltene, is suitable for thickened oil with high asphaltene content, and the 6-2 strain is hydrocarbon degrading bacteria which are extracted from oil reservoirs of a certain oil well and are sensitive to thickened oil heteropolycyclic compounds, and is suitable for common thickened oil with higher colloid content. 1-2 strains have good effect of degrading the asphaltene content, and the aromatic hydrocarbon content is increased; the 6-2 strain has the application effects of degrading colloid and asphaltene content, the alkane concentration is obviously increased after hydrocarbon degradation, and the indoor experimental analysis shows that the 6-2 strain has obvious degradation effect on high carbon chain alkane.
Through the continuous microbial oil reservoir cultivation and directional regulation and control of the embodiment, the stable viscous oil microbial dominant functional bacteria reservoir is maintained, and through the continuous monitoring of the produced liquid of the oil well and the regular replenishment of the dominant functional microbial bacteria and the directional activator, the stable viscous oil cold production functional microbial dominant bacteria reservoir can be formed. In order to realize the cultivation of microorganisms with continuous functions, a ground injection and production system for continuously supplementing microorganisms and nutrient solution is constructed to be an effective guarantee means for the microbial oil recovery economy.
On the basis, the embodiment also carries out wax control and viscosity reduction on the oil well shaft: through the casing adding mode, the wax deposition and organic precipitation capacity of the oil well are reduced, and the near well blocking removal of the oil well is realized: the method is characterized in that the blocking of the oil flow channel by the organic matters is removed by injecting the oil well into the dead well, the oil well with the physical property change of crude oil caused by degassing in production is dredged, and the blocking removal of the oil well caused by the precipitation of organic scale is carried out. And the production is reproduced by stopping the well Leng Cai through the thickened oil: and (5) carrying out microbial throughput and microbial removal on the region with the temperature lower than 60 ℃ after the thick oil is shut down.
According to the embodiment, the stable viscous crude microorganism dominant functional bacteria reservoir is maintained through continuous microbial oil reservoir cultivation and directional regulation, and the stable viscous crude cold-position exploitation functional microorganism dominant bacteria reservoir can be formed through continuous monitoring of the separated water of the produced liquid and regular replenishment of dominant exogenous bacteria and directional growth promoters. In order to realize the cultivation of continuous functional microorganisms, a ground injection and production system for separating and reinjection and supplementing produced liquid is formed and becomes an effective guarantee means. For example, after the produced fluid of the oil production well is concentrated and enters a central processing station, the produced fluid flora is detected through oil-water separation, and functional microorganisms and directional activators are periodically supplemented and then reinjected to form a closed-loop circulating injection and production microorganism circulating injection and production system.
By adopting the method of the embodiment, the plugging radius of the water channeling channel of oil reservoir exploitation is determined according to the oil well extraction degree and the steam channeling characteristic; according to the plugging radius, the water channeling channels are deeply plugged, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance; stopping the pump for 5min after plugging, and stabilizing the pressure of stopping the pump at about 2.5MPa so as to ensure that residual oil forms a wave in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection. After the high-permeability water channeling channels around the injection well are plugged, the microbial displacement sweep range can be increased, the probability of contact between microorganisms and stratum residual oil is increased, and the utilization degree of the residual oil is increased.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract) and all of the processes or units of any method or apparatus so disclosed, except insofar as at least some of such features and/or processes or units are mutually exclusive, may be used in combination. Each feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functionality of some or all of the components according to embodiments of the present invention may be implemented in practice using a microprocessor or Digital Signal Processor (DSP). The present invention can also be implemented as an apparatus or device program (e.g., a computer program and a computer program product) for performing a portion or all of the methods described herein. Such a program embodying the present invention may be stored on a computer readable medium, or may have the form of one or more signals. Such signals may be downloaded from an internet website, provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (4)
1. The method for improving the exploitation efficiency of the cold level of the oil reservoir microorganisms is characterized by comprising the following steps:
step 1: determining the plugging radius of a water channeling passage of an oil well for oil reservoir exploitation according to the oil well extraction degree and the steam channeling characteristics;
step 2: according to the plugging radius, the water channeling channels are deeply plugged, the communication among the water channeling channels among the oil wells is blocked, the microorganisms and the activators thereof injected into the oil wells are ensured to be in contact with the residual oil rapidly, and the target hydrocarbon degradation microorganisms in the thickened oil are activated to form certain abundance;
step 3: stopping the pump for 5min after plugging, wherein the pressure of stopping the pump is stabilized at 2.5MPa, so as to ensure that residual oil forms a wave in the direction of a non-water channeling channel at a higher injection pressure during microorganism injection;
step 4: dividing three temperature ranges according to the historical shut-in well region well opening production temperature, and dividing the oil well into a first temperature range, a second temperature range and a third temperature range according to the three temperature ranges; the method comprises the steps of determining the type and the abundance of microorganism bacteria in an oil reservoir in the oil well type under three temperature ranges, wherein the third temperature range is determined according to the temperature of the oil reservoir; the lowest temperature of the first temperature range is higher than the highest temperature of the second temperature range; the lowest temperature of the second temperature range is higher than the highest temperature of the third temperature range;
step 5: separating thick oil from produced liquid of the oil well corresponding to the third temperature range, and respectively selecting asphalt degrading bacteria, heteroatom compound degrading bacteria, desulfurizing bacteria, denitrifying bacteria, carbon fixing bacteria and culture medium which are screened indoors for culture to determine the type of functional microorganism bacteria with highest degradation degree of the thick oil, strongest metabolic product emulsifying capacity and targeting property of the culture medium;
step 6: taking the produced liquid of the oil well corresponding to the first temperature range, the produced liquid of the oil well corresponding to the second temperature range and the produced liquid of the oil well corresponding to the third temperature range as base liquids respectively, adding the functional microorganism bacteria and the target culture medium screened in the step 5 into a shaking table for 7 days, analyzing the types and abundance of microorganisms in the produced liquid of the oil well corresponding to the three temperature ranges, adjusting the concentration and composition of the target culture medium, and selecting the concentration of the functional microorganism bacteria to be more than 1 multiplied by 10 8 cfu/ml, wherein a culture medium with abundance of more than 60% is a targeting culture medium;
step 7: according to the distribution characteristics of the residual oil, the flooding well pattern is adjusted, well pattern combination is carried out by taking the driving between oil wells as a principle, and the functional microorganism in the step 6 is fermented in the target culture medium until the concentration of the bacterial liquid reaches 1 multiplied by 10 10 cfu/ml, and then injecting the fermented bacterial liquid into a flooding well pattern for well-flushing operation;
the step 1 further comprises:
aiming at the oil reservoir recovery degree of more than 35 percent and prompting frequent steam channeling during steam injection, the plugging radius is 20-25m;
aiming at the oil reservoir recovery degree less than 35% and prompting frequent steam channeling during steam injection, the plugging radius is 15-20m;
aiming at the fact that the oil reservoir recovery degree is more than 35%, the steam channeling frequency is not prompted during the steam injection period, and the plugging radius is 15-20m;
aiming at the oil reservoir recovery degree less than 35%, the frequent steam channeling during steam injection is not prompted, and the plugging radius is 10-15m;
the well-stewing operation specifically comprises the following steps: if the viscosity of the underground crude oil reservoir is 200-1000mPa.s, the well is stewed for 7-30 days; if the viscosity of the underground crude oil reservoir is 1000-5000 Pa.s, the well is stewed for 30-100 days; if the viscosity of the underground crude oil reservoir is 5000-20000 Pa.s, the well is stewed for 100-120 days.
2. The method according to claim 1, characterized in that the method further comprises step 8: adjusting a ground gathering and transporting system, testing produced liquid of an oil well corresponding to three temperature ranges to obtain the concentration of functional microorganism bacteria and the abundance of the functional microorganism bacteria, and when the concentration of the functional microorganism bacteria is lower than 1 multiplied by 10 6 When cfu/ml and/or the abundance of functional microorganism is lower than 60%, supplementing the functional microorganism and the targeting culture medium to the concentration of bacterial liquid of 1 multiplied by 10 8 cfu/ml and reinjected back into the well.
3. The method of any one of claims 1-2, wherein the functional microorganism and the targeting medium are both water-borne.
4. The method of claim 1, wherein the water channeling is determined based on a channeling water channel and a deficit volume that has been formed in the well.
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