CN107152266B - Method for improving biogasification rate of residual oil in oil reservoir and application of method - Google Patents
Method for improving biogasification rate of residual oil in oil reservoir and application of method Download PDFInfo
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- CN107152266B CN107152266B CN201610122219.8A CN201610122219A CN107152266B CN 107152266 B CN107152266 B CN 107152266B CN 201610122219 A CN201610122219 A CN 201610122219A CN 107152266 B CN107152266 B CN 107152266B
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Abstract
The invention relates to a method for improving the biological gasification rate of residual oil in an oil reservoir, which comprises the following steps: 1) constructing an electrode in the oil reservoir; 2) injecting an aqueous solution of an anaerobic microorganism activator into the oil reservoir; 3) applying voltage through the electrodes to form a micro-electric field in the oil reservoir so as to stimulate the proliferation and metabolism of methanogens and their metabolic bacteria; 4) stopping applying the voltage, and injecting aqueous liquid into the oil reservoir to displace methanogens and their metabolic bacteria to the deep part of the stratum; 5) and (5) opening a well to produce methane. The invention also relates to the use thereof.
Description
Technical Field
The invention relates to a method for improving the speed, in particular to a method for improving the speed in the field of oil reservoirs. The invention also relates to the use thereof.
Background
With the rapid development and energy structure adjustment of national economy, the energy demand of China is increasingly vigorous, and the contradiction between supply and demand is increasingly aggravated: by the end of 2014, the annual import quantities of petroleum and natural gas in China respectively reach 3.1 hundred million tons and 457 hundred cubic meters, and the external dependence degrees are 59.6 percent and 25.6 percent respectively. At present, 80% of petroleum capacity in China comes from water drive development oil reservoirs, onshore oil fields generally enter a high water cut period (47.3% and 43.5% of used reserves of medium petrochemicals and medium petroleum respectively enter an ultrahigh water cut period), and the oil fields in China enter a water drive abandonment stage in 10 years in the future according to the storage-extraction ratio of 16.85. However, in the current oil recovery technology level, the total recovery rate of oil reservoirs is still low (less than 40%), and a large amount of residual oil exists underground and cannot be developed economically and effectively.
The oil reservoir residual oil biological gasification technology is an important prospective research subject in the world at present, provides a beneficial technical thought for the efficient development of low-grade oil gas resources, and has been widely regarded and paid attention by developed countries in Europe and America. The oil reservoir residual oil biological gasification technology is characterized in that a microbial community of 'interoperable metabolic bacteria-methane bacteria' is formed in a stratum by activating oil reservoir endogenous microorganisms or introducing exogenous microorganisms, and residual oil is converted into natural gas (methane) through anaerobic degradation, so that the residual oil is extracted in the form of natural gas; or the oil reservoir energy is supplemented through biological gasification, so that the utilization efficiency and the exploitation level of oil and gas resources are greatly improved.
However, the initial reaction of anaerobic hydrocarbon degradation of hydrocarbon substances, namely the hydrogen-producing and acetic acid-producing reaction of anaerobic hydrocarbon degradation of hydrocarbon substrates, has a positive gibbs free energy change amount (energy needs to be supplied from the outside), namely the reaction can not be carried out spontaneously, and microorganisms must grab extra energy by means of extracellular electron transfer and the like, so that the reaction rate of anaerobic hydrocarbon degradation is greatly limited by the reaction processes, so that the degradation and gas production speed of the hydrocarbon microorganisms under anaerobic conditions is very slow, the biodegradation of petroleum under natural conditions needs a time scale of millions of years, the reaction speed can not form large-scale natural gas aggregation in a short time, although the artificial activation method can improve the methane production rate of residual oil to a certain extent, the conversion rate is converted according to the current report, and the gas production rate can not meet the requirement of large-scale gas reservoir development.
Disclosure of Invention
In order to solve the problems in the prior art, the present invention provides a method for increasing the rate of biogasification of residual oil in an oil reservoir. According to the method, intercellular electron transfer is enhanced through the microbial electrolytic cell system, so that energy supply of electric energy to anaerobic degradation reaction of hydrocarbon substances is realized, thermodynamic limitation of reaction in a microbial catalysis process is broken through, and the reaction rate of anaerobic degradation of residual oil to methane is increased.
In one embodiment of the present invention, the present invention provides a method for increasing the rate of biogasification of residual oil from a reservoir, comprising the steps of:
1) constructing an electrode in the oil reservoir;
2) injecting an aqueous solution of an anaerobic microorganism activator into the oil reservoir;
3) applying voltage through the electrodes to form a micro-electric field in the oil reservoir so as to stimulate the proliferation and metabolism of methanogens and their metabolic bacteria;
4) stopping applying the voltage, and injecting aqueous liquid, preferably water into the oil reservoir to displace methanogens and their metabolic bacteria to the deep part of the stratum;
5) and (5) opening a well to produce methane.
In a preferred embodiment of the present invention, the above steps 1) to 5) may be performed in any order that is logically feasible, preferably in order from step 1) to step 5).
The invention creatively introduces the microbial electrolytic cell technology into the application fields of biogeochemistry, oil-gas field development and the like, adopts the micro electric field to realize high-efficiency extracellular electron transfer and exogenous energy supply in the speed-limiting reaction of hydrocarbon anaerobic degradation, and greatly improves the methane production rate of hydrocarbon anaerobic degradation. Under the combination of the anode and the cathode of the microbial electrolytic cell, the 'reaction thermodynamics-electrochemistry' mechanism for producing methane by anaerobic degradation of hydrocarbon is as follows:
① Anode reaction (mutual nutrition metabolic bacteria as main body)
Crude oil + H2O→CH3COOH+H++e-
CH3COOH→CH4+CO2
② cathode reaction (methanogen as main body)
CO2+H++e-→CH4+H2O
③ Overall reaction
Crude oil + H2O→CH4+CO2
The invention supplies energy to the biological catalysis process through the micro electric field, and improves the reaction rate of anaerobic degradation and methane production by using hydrocarbon as a substrate under the combined action of biological catalysis and electrochemistry. The invention converts the electric energy into biochemical energy through the micro electric field, breaks through the biological energy limitation of the hydrocarbon anaerobic methane production process, and improves the reaction efficiency of anaerobic methane production.
In the present invention, the term "methanogen" refers to a group of methane-producing microorganisms, particularly a group of methane-producing microorganisms that decompose acetic acid or reduce carbon dioxide-hydrogen. In the present invention, methanogenic "syntrophic bacteria" are microorganisms which grow under strictly anaerobic conditions and which, when fed with hydrogen-consuming microorganisms (methanogens), degrade hydrocarbon substrates in petroleum.
In the present invention, the term "displacement" refers to driving the existing fluid in the reservoir to move to the deep part of the reservoir by injecting the fluid.
In a preferred embodiment of the present invention, steps 1) to 5) are repeated two or more times.
In a preferred embodiment of the invention, the electrode of step 1) is constructed using a method comprising hydraulic fracturing techniques.
In a preferred embodiment of the present invention, the electrode is a proppant prepared using a conductive material. In the preferred embodiment, the electrode is constructed using a conductive material to make the proppant and then connecting the lead downhole to a dc power source. While the conventional proppant in the field is used for propping cracks and is generally ceramsite or quartz sand, the preferred embodiment of the invention uses a conductive material to prepare the proppant which is a proppant and an electrode, and has a particularly good technical effect of being used as a single agent.
In a preferred embodiment of the present invention, the amount of the anaerobic microorganism activator injected in step 2) is V ± 10%, wherein V is calculated by the following formula:
wherein L represents the radius length of the hydraulic fracture, h represents the fracture height of the hydraulic fracture, w represents the fracture width of the hydraulic fracture, and phi represents the oil reservoir porosity.
In a preferred embodiment of the present invention, the anaerobic microorganism activator of step 2) includes a nitrogen source, a phosphorous source, a sulfur source, and an organic substance. More preferably, the anaerobic microorganism activator includes 0.5 to 1.0g of nitrogen source, 0.2 to 0.5g of phosphorus source, 0.05 to 0.10g of sulfur source, and 0.01 to 0.05g of organic matter per liter of the aqueous solution of the anaerobic microorganism activator of step 2).
In a preferred embodiment of the invention, the anaerobic microorganism activator is prepared by adding one or more of a nitrogen source, a phosphorus source, a sulfur source and/or an organic matter to the treated produced fluid or clear water.
In a preferred embodiment of the invention, the nitrogen source comprises one or more of ammonium chloride, urea, potassium nitrate and sodium nitrate.
In a preferred embodiment of the invention, the source of phosphorus comprises one or more of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate and disodium hydrogen phosphate.
In a preferred embodiment of the invention, the sulphur source comprises one or more of potassium sulphate, sodium sulphate and magnesium sulphate.
In a preferred embodiment of the invention, the organic material comprises one or more of yeast extract, beef extract and peptone.
In a preferred embodiment of the present invention, the voltage of step 3) has a voltage intensity of 0.10 to 1.50V.
In a preferred embodiment of the invention, the field strength of the micro-electric field is 0.001-0.05V/m.
In a preferred embodiment of the invention, the duration of said applying of voltage in step 3) is between 30 and 90 days, preferably between 60 and 80 days.
It is a further object of the present invention to provide the use of the above method for enhancing the residual oil production and/or recovery of a reservoir.
The invention has the beneficial effects that: the method can greatly improve the biological gasification rate of the residual oil in the oil reservoir, and saves energy and protects the environment.
Drawings
FIG. 1 is a schematic diagram of micro electric fields in an oil reservoir formed by combining multiple sections of fracture surfaces, wherein the multiple sections of fracture surfaces in a multi-section fractured horizontal well are used as electrodes. Wherein the arrows indicate the fracture propagation direction of the proppant at the time of fracturing.
Detailed Description
The invention is further illustrated by the following non-limiting examples, but the scope of the invention is not limited to the examples.
Example 1:
a certain block of a depleted oil reservoir in a Henan oilfield implements multi-staged fracturing of a horizontal well, the number of fracturing sections is 8, and about 50m of fracturing fluid is injected into each section (the length of a half seam is 100 m, the height of the seam is 30m, the width of the seam is 10 mm, and the porosity is 50 percent)3Activator, co-injection activator 400m3The activator comprises 0.5g/L urea, 0.25g/L dipotassium hydrogen phosphate, 0.05g/L magnesium sulfate and 0.01g/L yeast extract. The electrode is constructed by performing hydraulic fracturing with a proppant made of a conductive material and then connecting a lead to a direct current power supply at the bottom of the well. Setting adjacent segments as anode and cathode respectively, setting anode voltage as-0.20V vs. reference electrode voltage (NHE) and cathode voltage as-0.35V vs. reference electrode voltage (NHE), applying voltage for 90 days, stopping applying voltage, and using 4000m3And (4) displacing water, and after the well is sealed for 180 days, the initial yield of natural gas is 4 ten thousand square days after the well is opened.
Example 2:
a depleted oil reservoir in a certain region of the Jiangsu oil field is subjected to single-well staged fracturing, the number of fracturing stages is 2, a target reservoir is shallow,is a horizontal seam. About 30m is injected into each section (the length of the half seam is 80 m, the height of the seam is 40 m, the width of the seam is 6 mm, and the porosity is 50 percent)3Activator, co-injection activator 60m3The activator comprises 0.8g/L ammonium chloride, 0.50g/L dipotassium hydrogen phosphate, 0.08g/L magnesium sulfate and 0.01g/L beef extract. The electrode is constructed by performing hydraulic fracturing with a proppant made of a conductive material and then connecting a lead to a direct current power supply at the bottom of the well. Setting adjacent segments as anode and cathode, setting anode voltage at-0.15V vs. NHE and cathode voltage at-0.40V vs. NHE, applying voltage for 60 days, stopping applying voltage, and using 800m3And (4) displacing water, and after 150 days of well closing, the initial yield of natural gas is 1.6 ten thousand square/day after well opening.
Comparative example 1
No methane production of any microbial origin was observed in the southwestern river field of a certain block of depleted oil reservoirs as described in example 1 before treatment as described in example 1 (i.e. without electrodes and micro-fields).
Comparative example 2
No methane production of any microbial origin was observed in the depleted oil reservoir of a section of the Jiangsu oil field as described in example 2 before it was treated as described in example 2 (i.e. without electrodes and micro-fields).
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. A method of increasing the rate of biogasification of residual oil from a reservoir, comprising the steps of:
1) constructing an electrode in the oil reservoir;
2) injecting an aqueous solution of an anaerobic microorganism activator into the oil reservoir;
3) applying voltage through the electrodes to form a micro-electric field in the oil reservoir so as to stimulate the proliferation and metabolism of methanogens and their metabolic bacteria;
4) stopping applying the voltage, and injecting aqueous liquid into the oil reservoir to displace methanogens and their metabolic bacteria to the deep part of the stratum;
5) opening a well to produce methane;
the field intensity of the micro electric field is 0.01-0.05V/m;
the electrode is a proppant made using a conductive material.
2. The method according to claim 1, wherein in step 4), the voltage application is stopped, and water is injected into the reservoir to displace methanogens and their syntrophic bacteria deep in the formation.
3. The method according to claim 1 or 2, wherein steps 1) to 5) are repeated two or more times.
4. A method according to claim 1 or claim 2, wherein the electrodes of step 1) are constructed using a method comprising hydraulic fracturing techniques.
5. The method according to claim 1 or 2, wherein the amount of the anaerobic microorganism activator injected in step 2) is V ± 10%, wherein V is calculated by the following formula:
wherein L represents the radius length of the hydraulic fracture, h represents the fracture height of the hydraulic fracture, w represents the fracture width of the hydraulic fracture, and phi represents the oil reservoir porosity.
6. The method according to claim 1 or 2, wherein the anaerobic microorganism activator of step 2) comprises a nitrogen source, a phosphorous source, a sulfur source, and an organic substance.
7. The method according to claim 6, wherein the anaerobic microorganism activator comprises 0.5 to 1.0g of nitrogen source, 0.2 to 0.5g of phosphorus source, 0.05 to 0.10g of sulfur source, and 0.01 to 0.05g of organic matter per liter of the aqueous solution of the anaerobic microorganism activator of step 2).
8. The method of claim 6, wherein the nitrogen source comprises one or more of ammonium chloride, urea, potassium nitrate, and sodium nitrate;
the phosphorus source comprises one or more of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate and disodium hydrogen phosphate;
the sulfur source comprises one or more of potassium sulfate, sodium sulfate and magnesium sulfate;
the organic matter comprises one or more of yeast extract, beef extract and peptone.
9. The method according to claim 1 or 2, wherein the voltage of step 3) has a voltage intensity of 0.10-1.50V.
10. Use of the method according to any one of claims 1-9 for enhancing the residual oil production and/or recovery of a reservoir.
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| CA2999599C (en) | 2015-09-22 | 2019-12-31 | 9668241 Canada Inc. | Microbially enhanced thermal oil recovery |
| CN110259423A (en) * | 2019-06-06 | 2019-09-20 | 太原理工大学 | A kind of applying direct current electric field combines the method for volume increase coal bed gas with microbial degradation |
| CN110863809B (en) * | 2019-10-22 | 2022-01-28 | 中国石油化工股份有限公司 | Method for compositely displacing oil by utilizing electric field and microorganisms |
| CN110564778B (en) * | 2019-10-22 | 2021-04-09 | 中国石油化工股份有限公司 | Method for improving residual oil gasification rate by using biological enzyme |
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