CN106904749B - Biological activator for oil field reinjection water treatment and preparation method thereof - Google Patents
Biological activator for oil field reinjection water treatment and preparation method thereof Download PDFInfo
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- CN106904749B CN106904749B CN201710086481.6A CN201710086481A CN106904749B CN 106904749 B CN106904749 B CN 106904749B CN 201710086481 A CN201710086481 A CN 201710086481A CN 106904749 B CN106904749 B CN 106904749B
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- molybdate
- nitrate
- nitrite
- bioactivator
- denitrifying bacteria
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a biological activator for treating oil field reinjection water and a preparation method thereof. The invention has the beneficial effects that: the mixed solution of the low-concentration Nitrate mixture is injected into the reservoir to effectively replace sulfate as an electron acceptor, so that the number of naturally-existing Nitrate-Reducing Bacteria (NRB for short) is increased, VFA is effectively utilized, and SRB is inhibited and finally replaced; the technology can activate mass propagation of indigenous microorganisms in the reservoir by introducing a small amount of biological activator, and achieves the aims of inhibiting bacteria, controlling sulfur, reducing corrosion and improving oil recovery ratio, thereby reducing pollution load.
Description
Technical Field
The invention relates to the technical field of oilfield reinjection water, in particular to a biological activator for oilfield reinjection water treatment and a preparation method thereof.
Background
Hydrogen sulfide is formed in most oil reservoirs and oil and gas recovery systems by the action of sulfate-reducing bacteria. SRB and the hydrogen sulfide produced by it are the main causes of high reservoir development costs and a series of operational problems, including reservoir souring, sulfide corrosion, iron sulfide formation plugging, yield reduction and health, safety and environmental hazards. Biogenic sulfide problems are particularly acute in the petroleum industry, have caused significant economic losses, not only have increased the costs associated with microbial induced corrosion, but biogenic sulfides pose serious hazards to human health and the environment, and have effects that include: accelerated corrosion and equipment damage, increased equipment renewal costs, increased costs for purchasing fungicides, reduced production and revenue due to iron sulfide plugging, reduced quality of oil and gas products, environmental pollution and harm to the human body.
Inhibiting the reproduction of SRB bacteria in the water. The problem of lowering corrosion rate and improving petroleum recovery ratio is a problem to be solved urgently in the treatment link of oilfield reinjection water. At present, chemical bactericides are generally adopted in oil fields to control hazards caused by SRB, and remarkable effects are achieved, but long-term use of the bactericides can cause bacteria to generate drug resistance, the dosage of the bactericide is increased, the cost is increased, and meanwhile, pollution load is brought to the environment.
Disclosure of Invention
The embodiment of the invention provides a biological activator for oilfield reinjection water treatment and a preparation method thereof, which solve the problems that bacteria are easy to generate drug resistance and pollution load is brought to the environment in the oilfield reinjection water treatment process.
According to the first aspect of the invention, the biological activator for treating the oil field reinjection water is provided, and consists of nitrate, nitrite, molybdate, an imidazoline corrosion inhibitor and denitrifying bacteria.
Nitrate according to the mass ratio: nitrite salt: molybdate: imidazoline corrosion inhibitors: denitrifying bacteria ═ (10-30): (50-80): (2-5): (2-5): and (2-5) proportioning.
Preferably, the nitrate is prepared from the following components in percentage by mass: nitrite salt: molybdate: imidazoline corrosion inhibitors: denitrifying bacteria ═ (15-25): (60-70): (3-4): (3-4): (3-4) in proportion.
Preferably, the nitrate is prepared from the following components in percentage by mass: nitrite salt: molybdate: imidazoline corrosion inhibitors: 20 for denitrifying bacteria: 65: 4: 4: 4, proportioning.
The nitrate is any one or mixture of more of potassium nitrate, sodium nitrate, magnesium nitrate, calcium nitrate, aluminum nitrate and copper nitrate.
The nitrite is any one or mixture of more of potassium nitrite, sodium nitrite, magnesium nitrite, calcium nitrite, aluminum nitrite and copper nitrite.
The molybdate is any one or mixture of more of potassium molybdate, sodium molybdate, magnesium molybdate, calcium molybdate, aluminum molybdate and copper molybdate.
A preparation method of a biological activator for oilfield reinjection water treatment comprises the following steps:
A. adding nitrate, nitrite and molybdate into water according to a proportion, and mixing to form primary mixed solution;
B. adding an imidazoline corrosion inhibitor and denitrifying bacteria into the primary mixed solution according to the proportion, and uniformly stirring to form a secondary mixed solution;
C. and adding clear water into the secondary mixed solution until the concentration reaches a set value.
In the step A, firstly, nitrate is added into water to be mixed and dissolved, and then nitrite and molybdate are added into the dissolving solution and are stirred uniformly.
In step A, the dissolution step takes at least 30 minutes, and the stirring step takes at least 30 minutes.
The stirring step in step B takes at least 20 minutes.
The invention has the beneficial effects that: the mixed solution of the low-concentration Nitrate mixture is injected into the reservoir to effectively replace sulfate as an electron acceptor, so that the number of naturally-existing Nitrate-Reducing Bacteria (NRB for short) is increased, VFA is effectively utilized, and SRB is inhibited and finally replaced; the technology can activate mass propagation of indigenous microorganisms in the reservoir by introducing a small amount of biological activator, and achieves the aims of inhibiting bacteria, controlling sulfur, reducing corrosion and improving oil recovery ratio, thereby reducing pollution load.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Example 1, the present invention provides a biological activator for oilfield reinjection water treatment, which is composed of nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria, and is formulated according to the mixture ratio shown in table 1 below.
TABLE 1
| Name (R) | Unit of | Number of |
| Nitrate salt | kg | 10 |
| Nitrite salt | kg | 50 |
| Molybdate salt | kg | 2 |
| Imidazoline corrosion inhibitor | kg | 2 |
| Denitrifying bacteria | kg | 2 |
| Water (W) | kg | 100 |
Embodiment 2, the present invention provides a biological activator for oilfield reinjection water treatment, which is composed of nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria, and is formulated according to the mixture ratio shown in table 2 below.
TABLE 2
| Name (R) | Unit of | Number of |
| Nitrate salt | kg | 30 |
| Nitrite salt | kg | 80 |
| Molybdate salt | kg | 5 |
| Imidazoline corrosion inhibitor | kg | 5 |
| Denitrifying bacteria | kg | 5 |
| Water (W) | kg | 100 |
Example 3, the present invention provides a biological activator for oilfield reinjection water treatment, which is composed of nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria, and is formulated according to the formulation shown in table 3 below.
TABLE 3
| Name (R) | Unit of | Number of |
| Nitrate salt | kg | 15 |
| Nitrite salt | kg | 60 |
| Molybdate salt | kg | 3 |
| Imidazoline corrosion inhibitor | kg | 3 |
| Denitrifying bacteria | kg | 3 |
| Water (W) | kg | 100 |
Example 4, the present invention provides a biological activator for oilfield reinjection water treatment, which is composed of nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria, and is formulated according to the formulation shown in table 4 below.
TABLE 4
| Name (R) | Unit of | Number of |
| Nitrate salt | kg | 25 |
| Nitrite salt | kg | 70 |
| Molybdate salt | kg | 4 |
| Imidazoline corrosion inhibitor | kg | 4 |
| Denitrifying bacteria | kg | 4 |
| Water (W) | kg | 100 |
Example 5, the present invention provides a biological activator for oilfield reinjection water treatment, which is composed of nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria, and is formulated according to the formulation shown in table 5 below.
TABLE 5
| Name (R) | Unit of | Number of |
| Nitrate salt | kg | 20 |
| Nitrite salt | kg | 65 |
| Molybdate salt | kg | 4 |
| Imidazoline corrosion inhibitor | kg | 4 |
| Denitrifying bacteria | kg | 4 |
| Water (W) | kg | 100 |
In the above embodiment:
the nitrate is any one or mixture of more of potassium nitrate, sodium nitrate, magnesium nitrate, calcium nitrate, aluminum nitrate and copper nitrate.
The nitrite is any one or mixture of more of potassium nitrite, sodium nitrite, magnesium nitrite, calcium nitrite, aluminum nitrite and copper nitrite.
The molybdate is any one or mixture of more of potassium molybdate, sodium molybdate, magnesium molybdate, calcium molybdate, aluminum molybdate and copper molybdate.
A preparation method of a biological activator for oilfield reinjection water treatment comprises the following steps:
A. adding nitrate, nitrite and molybdate into water according to a proportion, and mixing to form primary mixed solution;
B. adding an imidazoline corrosion inhibitor and denitrifying bacteria into the primary mixed solution according to the proportion, and uniformly stirring to form a secondary mixed solution;
C. and adding clear water into the secondary mixed solution until the concentration reaches a set value.
In the step A, firstly, nitrate is added into water to be mixed and dissolved, and then nitrite and molybdate are added into the dissolving solution and are stirred uniformly.
In step A, the dissolution step takes at least 30 minutes, and the stirring step takes at least 30 minutes.
The stirring step in step B takes at least 20 minutes.
Comparative example 1: high-sulfur reinjection sewage treatment for Qinghai oilfield
80-120 ppm of sulfide, 0.1896mm/a of corrosion rate and 10 SRB bacteria before high-sulfur reinjection sewage treatment in Qinghai oilfield3～105Per m L strain 101The number per m of the treated sewage is L, the treated sewage has the sulfide content of 0ppm, the corrosion rate of 0.0105mm/a and the number of SRB bacteria of 10-25/m of L bacteria of 104-105/m of L.
Comparative example 2: changqing oil field high sulfur content reinjection sewage treatment
200-300 ppm of sulfide, 0.2735mm/a of corrosion rate and 10 SRB (sulfate reducing bacteria) before high-sulfur reinjection sewage treatment in Changqing oil field4～105Per m L strain 101The number per m of the treated sewage is L, the treated sewage has the sulfide content of 0ppm, the corrosion rate of 0.0125mm/a and the number of SRB bacteria of 10-25/m L bacteria of 104-105/m L.
The invention has the beneficial effects that: the mixed solution of the low-concentration Nitrate mixture is injected into the reservoir to effectively replace sulfate as an electron acceptor, so that the number of naturally-existing Nitrate-Reducing Bacteria (NRB for short) is increased, VFA is effectively utilized, and SRB is inhibited and finally replaced; the technology can activate mass propagation of indigenous microorganisms in the reservoir by introducing a small amount of biological activator, and achieves the aims of inhibiting bacteria, controlling sulfur, reducing corrosion and improving oil recovery ratio, thereby reducing pollution load.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the specification and the claims.
Claims (9)
1. A biological activator for treating oil field reinjection water comprises nitrate, nitrite, molybdate, imidazoline corrosion inhibitor and denitrifying bacteria;
nitrate according to the mass ratio: nitrite salt: molybdate: imidazoline corrosion inhibitors: denitrifying bacteria ═ (10-30): (50-80): (2-5): (2-5): and (2-5) proportioning.
2. The bioactivator of claim 1, wherein the bioactivator is characterized by comprising the following components in percentage by mass: nitrite salt: molybdate: imidazoline corrosion inhibitors: denitrifying bacteria ═ (15-25): (60-70): (3-4): (3-4): (3-4) in proportion.
3. The bioactivator of claim 2, wherein the bioactivator is characterized by comprising the following components in percentage by mass: nitrite salt: molybdate: imidazoline corrosion inhibitors: 20 for denitrifying bacteria: 65: 4: 4: 4, proportioning.
4. A bioactivator as claimed in any one of claims 1 to 3 wherein said nitrate is any one or more of potassium nitrate, sodium nitrate, magnesium nitrate, calcium nitrate, aluminium nitrate, copper nitrate.
5. The bioactivator of one of claims 1-3, wherein said nitrite is any one or a mixture of potassium nitrite, sodium nitrite, magnesium nitrite, calcium nitrite, aluminum nitrite, copper nitrite.
6. A bioactivator as defined in any one of claims 1 to 3, wherein said molybdate is any one or a mixture of potassium molybdate, sodium molybdate, magnesium molybdate, calcium molybdate, aluminum molybdate, and copper molybdate.
7. A preparation method of a biological activator for oilfield reinjection water treatment comprises the following steps:
A. adding nitrate, nitrite and molybdate into water according to a proportion, and mixing to form primary mixed solution;
B. adding an imidazoline corrosion inhibitor and denitrifying bacteria into the primary mixed solution according to the proportion, and uniformly stirring to form a secondary mixed solution;
C. adding clear water into the secondary mixed solution until the concentration reaches a set value;
nitrate according to the mass ratio: nitrite salt: molybdate: imidazoline corrosion inhibitors: denitrifying bacteria ═ (10-30): (50-80): (2-5): (2-5): and (2-5) proportioning.
8. The method of claim 7, wherein in the step A, the nitrate is firstly added into the water to be mixed and dissolved, then the nitrite and the molybdate are added into the dissolved solution to be stirred uniformly, and/or,
in step A, the dissolution step takes at least 30 minutes, and the stirring step takes at least 30 minutes.
9. The method of claim 7, wherein the step of agitating in step B takes at least 20 minutes.
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| CN106904749B true CN106904749B (en) | 2020-07-24 |
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| CN101875839B (en) * | 2009-04-30 | 2013-04-24 | 中国石油天然气股份有限公司 | Multifunctional preparation for controlling biological corrosion and blockage of oil field production system |
| CN103113866B (en) * | 2013-02-06 | 2014-12-10 | 中国石油化工股份有限公司 | Novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in oil well and use method thereof |
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