Microbial corrosion control system and application thereof

Abstract

The invention discloses a microbial corrosion control system and application thereof. The microbial corrosion control system is composed of a nutrition system, a microbial agent system and an auxiliary system, and the volume ratio of the nutrition system to the microbial agent system to the auxiliary system is (40-60): (5-10): (30-50). The invention also discloses application of the microbial corrosion control system as a microbial corrosion inhibitor in an oil-water well. The invention also discloses application of the microbial corrosion control system as a microbial corrosion inhibitor in a ground gathering pipeline. The invention has the following beneficial effects: (1) high-efficiency inhibition on corrosive microorganisms is realized; (2) the technical scheme is economical, environment-friendly and effective; and (3) the oil well operation period and the pipeline service life are prolonged, and the operation cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of oil field system corrosion control, and in particular relates to a microbial corrosion control system and application thereof. Background Art

[0002] As we all know, during the oil field production process, underground crude oil is extracted to the surface through oil wells and transported through ground gathering pipelines.

[0003] During the long-term production process, the corrosion of metal pipes has become the main factor in oil pipeline failure and even oil well overhaul, and may even lead to major safety accidents such as oil and gas leakage and explosion, causing huge economic losses and environmental pollution.

[0004] There are many factors that cause metal pipeline corrosion, among which microbial corrosion is an important aspect of metal pipeline corrosion, and its proportion even exceeds 20%. Since microorganisms can form stable biofilms on the surface of metal pipelines, accompanied by the catalytic process of electrochemical reactions by microorganisms, it eventually leads to serious corrosion of the material. Therefore, how to reduce the formation and aggregation of microbial films on the surface of materials and effectively control biological corrosion will help to extend the life of oilfield metal pipelines, reduce production costs, and improve benefits.

[0005] At present, there have been many reports on technologies related to corrosion control of oilfield systems. Chinese invention patent application CN113956860A discloses a method for constructing a microbial corrosion control system for an oilfield system, which includes the following steps: (1) analyzing the activity of sulfate-reducing bacteria in the corrosive oilfield system to determine the dominant sulfate-reducing bacteria; (2) constructing a targeted corrosion control system based on the dominant sulfate-reducing bacteria. The present invention is aimed at oil reservoirs with different characteristics and physical and chemical conditions, and establishes a targeted inhibition strategy based on the dominant sulfate-reducing bacteria in the corresponding environment, so as to control biological corrosion economically and effectively. In addition, Chinese invention patent application CN 114645279 A discloses the use of rhamnolipid as an environmentally friendly microbial corrosion inhibitor. The use of rhamnolipid as an environmentally friendly microbial corrosion inhibitor uses rhamnolipid as an environmentally friendly microbial corrosion inhibitor to inhibit the microbial corrosion problem faced by metal materials in service. Rhamnolipid is added to an environment that can cause microbial corrosion, and the uniform mass concentration of rhamnolipid in the environment is ensured to be 0.53-1.9 g / L. This patent application uses rhamnolipid as an environmentally friendly microbial corrosion inhibitor to inhibit the microbial corrosion problems faced by metal materials in service. It can not only inhibit metal corrosion itself, but also has the characteristics of being environmentally friendly and pollution-free. In addition, "Causes of Corrosion Failure of Ground Oil Pipelines in a Certain Overseas High-Sulfur and High-Salinity Oilfield" reported the analysis of the chemical composition and microstructure of the failed pipe sections serving in high-sulfur and high-salt crude oil, and the microbial detection of the produced water. The results showed that microbial corrosion (MIC) is the main cause of corrosion and leakage of pipelines, and the growth and reproduction of bacteria such as sulfate-reducing bacteria (SRB) leads to corrosion failure of pipelines.

[0006] The above patents have made many improvements and upgrades in microbial corrosion control, but there are still the following problems: (1) Different patents have different methods for controlling corrosion. Although the patents provide a detailed introduction to the steps of biological corrosion control, the technology is relatively simple and lacks a systematic and integrated effective technical system; (2) The different microbial corrosion control methods in the patents have not been able to achieve truly effective long-term corrosion control during on-site implementation. The corrosion control methods specified in the patents have been verified in the field, and the implementation effect is difficult to judge. Summary of the invention

[0007] Purpose of the invention: In view of the above-mentioned deficiencies of the prior art, the present invention provides a microbial corrosion control system and its application. The invention has the advantages of being simple and effective, easy to operate, safe and environmentally friendly, and can effectively control the corrosion of metal pipelines in oil fields, extend the operation cycle of oil wells and the service life of pipelines, and reduce operating costs.

[0008] Technical solution: A microbial corrosion control system, which consists of a nutrient system, a bacterial agent system and an auxiliary system, wherein:

[0009] The volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is (40-60):(5-10):(30-50).

[0010] Furthermore, the nutrition system consists of a carbon source, a nitrogen source, a phosphorus source and water.

[0011] Furthermore, based on the mass of the nutrition system, the mass concentration of the carbon source is 1-2%, the mass concentration of the nitrogen source is 0.5-1%, and the mass concentration of the phosphorus source is 0.1-0.3%.

[0012] Furthermore, the carbon source is one or more of glucose, sucrose, starch and maltose.

[0013] Furthermore, the nitrogen source is an organic nitrogen source and / or an inorganic nitrogen source, wherein:

[0014] The organic nitrogen source is one or more of peptone, yeast extract powder, and corn steep liquor powder; the inorganic nitrogen source is one or more of sodium nitrate, ammonium nitrate, and sodium nitrite.

[0015] Furthermore, the phosphorus source is one or more of dipotassium hydrogen phosphate, sodium dihydrogen phosphate and potassium dihydrogen phosphate.

[0016] Furthermore, the bacterial agent system is composed of fermentation liquid of nitrate-reducing bacteria and water, wherein: based on the total volume of the bacterial agent system, the volume concentration of the fermentation liquid of nitrate-reducing bacteria is 5-20%, preferably 5-10%.

[0017] Furthermore, the nitrate-reducing bacteria in the bacterial agent system are one or more of Thermobacterium thermophilum, Pseudomonas aeruginosa and Pseudomonas stutzeri, and exist in the form of fermentation broth of nitrate-reducing bacteria.

[0018] Furthermore, the auxiliary system consists of microbial polysaccharides, microbial surfactants and water.

[0019] Furthermore, based on the mass of the auxiliary system, the mass concentration of the microbial polysaccharide is 0.5-1%, and the mass concentration of the microbial surfactant is 0.05-0.1%.

[0020] Furthermore, the microbial polysaccharide in the auxiliary system is one or more of xanthan gum, welan gum, gellan gum and curdlan gum.

[0021] Furthermore, the microbial surfactant in the auxiliary system is one or more of rhamnolipids, sophorolipids and lipopeptides.

[0022] Application of any of the above-mentioned microbial corrosion control systems in oil production.

[0023] The microbial corrosion control system described in any one of the above items is used as a microbial corrosion inhibitor in oil and water wells.

[0024] Furthermore, the specific steps of the above application are as follows:

[0025] (1) When the well condition of an oil or water well becomes abnormal due to microbial corrosion or a new well is put into production, it is necessary to carry out operations and prepare to run a new completion string. Before running the new completion string, microbial corrosion control work must be done;

[0026] (2) Sterilize the tubing column by pressure control, and the implementation method is as follows:

[0027] After the pipe string is sealed and connected, the pressure is increased to 20-25MPa, and then the pressure is quickly released. The pressure release time is controlled within 1-2 seconds. The rapid release of pressure is used to rupture the bacteria and destroy the cell walls of harmful bacteria, thereby inhibiting corrosive bacteria. The number of pressure-controlled sterilization times is determined based on the measurement results of the corrosion rate of the oil and water wells themselves;

[0028] (3) Treating the tubing with a microbial corrosion control system: Based on the results of the corrosion rate measurements of the oil and water wells themselves, a certain thickness of effective adhesive coating is applied to the inner and outer surfaces of the tubing with the microbial corrosion control system;

[0029] (4) The pipe string treated in step (3) is lowered into the well to complete the construction.

[0030] Furthermore, the method further comprises the step (5) of effect tracking, which includes regularly detecting the concentration of sulfate-reducing bacteria in the wellhead produced fluid, and regularly adding the nutrient system part of the microbial corrosion control system through the oil casing annulus according to the concentration of sulfate-reducing bacteria, with the addition amount being 0.1-0.2 t / month, wherein: the relationship between the concentration of sulfate-reducing bacteria and the frequency of adding the nutrient system is selected as shown in the following table:

[0031] Table 3 Sulfate-reducing bacteria concentration and frequency of adding to the nutrient system

[0032] Wellhead sulfate-reducing bacteria concentration (unit / mL) <300 300-1000 >1000 Frequency of adding nutrition system (times / month) 1 2 3

[0033] Furthermore, in step (2), according to the results of the corrosion rate measurement of the oil and water wells themselves, the number of pressure-controlled sterilization is selected as follows:

[0034] The existing corrosion rate of oil and water wells is less than 0.08mm / year, and pressure control sterilization is performed once;

[0035] 0.08mm / year≤The existing corrosion rate of oil and water wells≤0.1mm / year, pressure control sterilization 1-3 times;

[0036] 0.1mm / year<The existing corrosion rate of oil and water wells is ≤0.3mm / year, and pressure control sterilization is performed 3-5 times;

[0037] The corrosion rate of the water well itself is > 0.3mm / year, and the pressure control sterilization is at least 8 times. As shown in Table 1:

[0038] The selection of the number of pressure-controlled sterilization and the column corrosion rate is shown in the following table:

[0039] Table 1 Selection of pressure-controlled sterilization times and column corrosion rate

[0040] Corrosion rate (mm / year) <0.08 [0.08,0.1] [0.1,0.3] >0.3 Pressure control sterilization times 1 1-3 3-5 >8 .

[0041] Furthermore, in step (3), according to the results of the measurement of the corrosion rate of the oil and water wells themselves, the selection of applying a layer of effective adhesive coating of a certain thickness on the inner and outer surfaces of the pipe string in the microbial corrosion control system is as follows:

[0042] The existing corrosion rate of oil and water wells is less than 0.08mm / year, and the thickness of the bonding coating is 0.5mm≤≤1mm;

[0043] 0.08mm / year≤The existing corrosion rate of oil and water wells≤0.1mm / year, 1mm<The thickness of the bonding coating≤1.5mm;

[0044] 0.1mm / year<the existing corrosion rate of oil and water wells≤0.3mm / year, 1.5mm<the thickness of the bonding coating≤3mm;

[0045] The corrosion rate of the water well itself is greater than 0.3mm / year, and the thickness of the adhesive coating is greater than 3mm. That is, the relationship between the adhesive thickness and the microbial corrosion rate of the microbial corrosion control system is shown in the following table:

[0046] Table 2 Relationship between bonding thickness and microbial corrosion rate of microbial corrosion control system

[0047] Corrosion rate (mm / year) <0.08 0.08-0.1 0.1-0.3 >0.3 Thickness of adhesive coating (mm) 0.5-1 1-1.5 1.5-3 >3

[0048] The microbial corrosion control system described in any one of the above items is used as a microbial corrosion inhibitor in ground gathering and transportation pipelines.

[0049] Furthermore, the specific steps of the above application are as follows:

[0050] (1) The surface gathering and transportation pipeline has abnormal well conditions due to microbial corrosion or the surface pipeline is newly put into use. It is necessary to carry out construction, prepare new transmission pipelines, and perform microbial corrosion control on the new transmission pipelines;

[0051] (2) Pressure control sterilization is performed on the ground gathering and transportation pipeline by the pressure control method. The implementation method is as follows:

[0052] After the pipeline is sealed and connected, the pressure is increased to 15-20MPa, and then the pressure is quickly released. The pressure release time is controlled within 0.5-1 second. The rapid release of pressure is used to rupture the bacteria and destroy the cell walls of harmful bacteria, thereby inhibiting corrosive bacteria. According to the measurement results of the corrosion rate of the ground gathering and transportation pipeline itself, the number of pressure control sterilization is determined;

[0053] (3) Treat the new transmission pipe with the microbial corrosion control system: Based on the corrosion rate test results of the surface gathering and transportation pipeline itself, apply a certain thickness of effective adhesive coating to the inner surface of the pipe with the microbial corrosion control system;

[0054] (4) Connecting the pipeline processed in step (3) to complete the construction;

[0055] Furthermore, it also includes (5) effect tracking: regularly detecting the concentration of sulfate-reducing bacteria in the pipe-transported liquid, and regularly adding the nutrient system part of the microbial corrosion control system through the pipe inlet according to the concentration of sulfate-reducing bacteria, with the addition amount being 0.2-0.4 t / month, wherein: the relationship between the concentration of sulfate-reducing bacteria and the frequency of adding the nutrient system is selected as shown in the following table:

[0056] Table 6 Sulfate-reducing bacteria concentration and frequency of adding to the nutrient system

[0057] Sulfate-reducing bacteria concentration (unit / mL) <300 300-1000 >1000 Frequency of adding nutrition system (times / month) 1 2 3 .

[0058] Furthermore, in step (2), according to the existing corrosion rate measurement results of the ground gathering and transportation pipeline itself, the number of pressure-controlled sterilization is selected as follows:

[0059] The existing corrosion rate of the ground gathering and transportation pipeline is less than 0.08mm / year, and the pressure control sterilization is performed once;

[0060] 0.08mm / year≤The existing corrosion rate of the ground gathering and transportation pipeline is ≤0.1mm / year, and the pressure is controlled and sterilized 1-3 times;

[0061] 0.1mm / year<The existing corrosion rate of the ground gathering and transportation pipeline itself is ≤0.3mm / year, and the pressure is controlled and sterilized 3-5 times;

[0062] The existing corrosion rate of the ground gathering and transportation pipeline itself is >0.3mm / year, and the pressure control sterilization is performed at least 8 times. As shown in the following table:

[0063] The number of pressure-controlled sterilization times and the existing corrosion rate of the ground gathering and transportation pipeline are selected as follows:

[0064] Table 4 Selection of the number of pressure-controlled sterilization and the existing corrosion rate of the ground gathering and transportation pipeline

[0065] Corrosion rate (mm / year) <0.08 0.08-0.1 0.1-0.3 >0.3 Pressure control sterilization times 1 1-3 3-5 >8 .

[0066] Furthermore, in step (3), according to the measurement results of the existing corrosion rate of the ground gathering and transportation pipeline itself, the microbial corrosion control system is coated with a layer of effective bonding coating of a certain thickness on the inner surface of the pipe column, and the selection is as follows:

[0067] The existing corrosion rate of the ground gathering and transportation pipeline itself is less than 0.08mm / year, and the thickness of the bonding coating is 1mm≤≤1.5mm;

[0068] 0.08mm / year≤The existing corrosion rate of the ground gathering and transportation pipeline itself≤0.1mm / year, 1.5mm<The thickness of the bonding coating≤2mm;

[0069] 0.1mm / year<The existing corrosion rate of the ground gathering and transportation pipeline itself≤0.3mm / year, 2.5mm≤The thickness of the bonding coating≤3.5mm;

[0070] The existing corrosion rate of the ground gathering and transportation pipeline itself is greater than 0.3mm / year, and the thickness of the bonding coating is greater than 3.5mm.

[0071] That is, the relationship between the bonding thickness of the microbial corrosion control system and the existing corrosion rate of the ground gathering and transportation pipeline itself is as follows:

[0072] Table 5 Relationship between the bonding thickness of the microbial corrosion control system and the existing corrosion rate of the surface gathering and transportation pipeline itself

[0073] Corrosion rate (mm / year) <0.08 0.08-0.1 0.1-0.3 >0.3 Bonding thickness (mm) 1-1.5 1.5-2 2.5-3.5 >3.5 .

[0074] The working principle of the present invention is as follows:

[0075] First, the pressure-controlled sterilization method is used to destroy the cell walls of microorganisms by applying pressure and quickly releasing pressure, thereby achieving the purpose of sterilization and reducing the survival rate of existing microorganisms in the column or pipeline;

[0076] Then, the pipe column or pipeline is bonded and coated with a microbial control system to form a protective film on the surface of the pipe column or pipeline, thereby inhibiting the corrosion of harmful bacteria to the pipe column or pipeline; the microbial control system includes three effective components, namely the nutrition system, the microbial agent system and the auxiliary system. The nutrition system provides the microbial agent system with the nutrients required for growth and metabolism to ensure that the microbial agent system can grow effectively. The microbial agent system contains bacteria that can inhibit sulfate-reducing bacteria. The growth of the microbial agent system inhibits harmful sulfate-reducing bacteria, thereby reducing the occurrence of corrosion. The auxiliary system contains microbial polysaccharides, micro Biological surfactants and microbial polysaccharides mainly play the role of adhering to the wall of the pipe column and pipeline due to their viscosity, creating a medium for the nutrient system and the bacterial agent system to exist on the wall. The microbial surfactants can have a certain inhibitory effect on sulfate-reducing bacteria due to their own surface activity. The microbial surfactants and the bacterial agent system work together to play a composite synergistic role, ultimately achieving effective protection of the pipe column or pipeline and extending the service life of the pipe column or pipeline. In addition, the present invention also adjusts the frequency of adding the daily nutrient system according to the usual tracking test results, thereby further ensuring the on-site effect and truly achieving the control of microbial corrosion.

[0077] Beneficial effects: The present invention has the following beneficial effects:

[0078] (1) The microbial corrosion control system of the present invention realizes effective adhesion of the coating on the pipe wall surface, and includes both microbial competition inhibition technology and microbial surfactant control technology, thus truly achieving high efficiency inhibition;

[0079] (2) The present invention utilizes a pressure control method to release pressure and sterilize the pipeline, which is economical, environmentally friendly and effective, and does not generate subsequent treatment risks;

[0080] (3) As a technology for controlling microbial corrosion, the present invention integrates a variety of technical systems and methods, and realizes new invention value and economic benefits as a whole, prolongs the operation cycle of oil wells and the service life of pipelines, and reduces operating costs. DETAILED DESCRIPTION

[0081] The specific embodiments of the present invention are described in detail below.

[0082] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0083] Embodiment 1:

[0084] Well A of a production plant in Shengli Oilfield: Well depth 1600m, reservoir temperature 65℃, reservoir pressure 14MPa, formation water salinity 8500mg / L, underground crude oil viscosity 120mPa·s, liquid volume 15m 3 / d, oil volume 0.97t / d, comprehensive water content 93.5%, corrosion rate of the oil pipe measured 0.09mm / year, concentration of sulfate-reducing bacteria in the produced fluid is 260 / mL.

[0085] The present invention is used to effectively control pipeline corrosion in oil well A, and the specific contents are as follows:

[0086] A microbial corrosion control system comprises a nutrient system, a bacterial agent system and an auxiliary system, wherein the volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 50:10:40.

[0087] Furthermore, the nutrition system consists of a carbon source, a nitrogen source, a phosphorus source and water.

[0088] The carbon source in the nutrition system is glucose with a mass concentration of 2%, the organic nitrogen source in the nitrogen source is yeast extract powder with a mass concentration of 0.5%, the inorganic nitrogen source is sodium nitrate with a mass concentration of 0.5%, the phosphorus source is sodium dihydrogen phosphate with a mass concentration of 0.2%, and the rest is water. The volume of the nutrition system accounts for 50% of the total volume of the microbial corrosion control system.

[0089] Furthermore, the bacterial agent system consists of fermentation liquid of nitrate-reducing bacteria and water.

[0090] The nitrate-reducing bacteria selected in the bacterial agent system are thermophilic bacteria and Pseudomonas aeruginosa. The volume concentrations of the two bacterial agents are 10% respectively, the total volume concentration is 20%, and the rest is water. The volume of the bacterial agent system accounts for 10% of the total volume of the microbial corrosion control system.

[0091] Furthermore, the auxiliary system consists of microbial polysaccharides, microbial surfactants and water.

[0092] The microbial polysaccharide in the auxiliary system is welan gum with a mass concentration of 0.8%, the microbial surfactant is rhamnolipid with a mass concentration of 0.08%, and the rest is water. The volume of the auxiliary system accounts for 40% of the total volume of the microbial corrosion control system.

[0093] Before on-site implementation, the auxiliary system is prepared separately, and the nutrient system and the microbial agent system are prepared separately and then mixed, and the mixture is set aside for use.

[0094] The above-mentioned microbial corrosion control system is used as a microbial corrosion inhibitor in oil and water wells. The specific steps are as follows:

[0095] 1. During the well inspection and pumping operation, the pipe string was pulled out from the well and a new completion pipe string was prepared to be lowered;

[0096] 2. The pressure control method is used to sterilize the tubing string. After the tubing string is sealed and connected, the pressure is increased to 20MPa, and then the pressure is quickly released. The pressure release time is 1 second. Since the tubing corrosion rate measured in this well is 0.09mm / year, the pressure control sterilization is performed 3 times;

[0097] 3. After the pressure control sterilization is completed, the pipe column is treated with the microbial corrosion control system, and the pipe column is coated with the prepared microbial corrosion control system. The coating bonding thickness is determined to be 1.5 mm according to the corrosion rate;

[0098] 4. After the above steps are completed, lower the pipe string into the well to complete the construction.

[0099] 5. On-site implementation effect tracking

[0100] After the technical solution of the present invention was implemented in oil well A in the test block, the crude oil production increased to 2.3 t / d, the comprehensive water content dropped to 85%, the sulfate-reducing bacteria detected at the wellhead was below 100 / mL, and the effective period exceeded 18 months. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus once a month, with an addition amount of 0.1 t / time, so as to maintain the growth of the bacterial system in the bonding coating, thereby better inhibiting sulfate-reducing bacteria.

[0101] Embodiment 2:

[0102] Well B conditions of a certain oil production plant in Shengli Oilfield: Well depth 1100m, reservoir temperature 50℃, reservoir pressure 10MPa, formation water salinity 5000mg / L, underground crude oil viscosity 20mPa·s, liquid volume 20m 3 / d, oil volume 1.3t / d, comprehensive water content 93.5%, corrosion rate of the oil pipe measured 0.2mm / year, concentration of sulfate-reducing bacteria in the produced fluid is 1600 / mL.

[0103] The present invention is used to effectively control the pipeline corrosion of water well B, and the specific contents are as follows:

[0104] A microbial corrosion control system comprises a nutrient system, a bacterial agent system and an auxiliary system, wherein the volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 60:5:35.

[0105] Furthermore, the nutrition system consists of a carbon source, a nitrogen source, a phosphorus source and water.

[0106] The carbon source in the nutrition system is starch with a mass concentration of 1%, the organic nitrogen source in the nitrogen source is peptone with a mass concentration of 0.5%, the inorganic nitrogen source is ammonium nitrate with a mass concentration of 0.25%, the phosphorus source is dipotassium hydrogen phosphate with a mass concentration of 0.3%, and the rest is water. The volume of the nutrition system accounts for 60% of the total volume of the microbial corrosion control system.

[0107] Furthermore, the bacterial agent system consists of fermentation liquid of nitrate-reducing bacteria and water.

[0108] Pseudomonas aeruginosa and Pseudomonas stutzeri are selected as nitrate-reducing bacteria in the bacterial agent system. The volume concentrations of the two bacterial agents are 5% respectively, the total volume concentration is 10%, and the rest is water. The volume of the bacterial agent system accounts for 5% of the total volume of the microbial corrosion control system.

[0109] Furthermore, the auxiliary system consists of microbial polysaccharides, microbial surfactants and water.

[0110] The microbial polysaccharide in the auxiliary system is xanthan gum with a mass concentration of 0.5%, the microbial surfactant is sophorolipid with a mass concentration of 0.1%, and the rest is water. The volume of the auxiliary system accounts for 35% of the total volume of the microbial corrosion control system.

[0111] Before on-site implementation, the auxiliary system is prepared separately, and the nutrient system and the microbial agent system are prepared separately and then mixed, and the mixture is set aside for use.

[0112] The above-mentioned microbial corrosion control system is used as a microbial corrosion inhibitor in oil and water wells.

[0113] 1. During the pump inspection operation of the water well, the pipe string is pulled out from the well and a new water injection pipe string is prepared to be lowered;

[0114] 2. The pipe string was sterilized by pressure control. After the pipe string was sealed and connected, the pressure was increased to 25MPa, and then the pressure was quickly released. The pressure release time was 2 seconds. Since the corrosion rate of the oil pipe measured in the well was 0.2mm / year, the pressure control sterilization was carried out 5 times;

[0115] 3. After the pressure control sterilization is completed, the pipe column is treated with the microbial corrosion control system, and the pipe column is coated with the prepared microbial corrosion control system. The coating bonding thickness is determined to be 2.5 mm according to the corrosion rate;

[0116] 4. After the above steps are completed, lower the pipe string into the well to complete the construction.

[0117] 5. On-site implementation effect tracking

[0118] After the technical solution of the present invention was implemented in the water well B of the test block, the injection volume was maintained efficiently, and the injection volume was 60m 3 / d, the actual water injection volume is 65m 3 / d. The sulfate-reducing bacteria detected at the wellhead were below 100 / mL, and the validity period exceeded 12 months. After 12 months, the sulfate-reducing bacteria were measured at 350 / mL. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus twice a month, with an addition amount of 0.15t / time, to maintain the growth of the bacterial system in the bonding coating, thereby better inhibiting sulfate-reducing bacteria.

[0119] Embodiment 3:

[0120] Well C of a production plant in Shengli Oilfield: Well depth 1250m, reservoir temperature 56℃, reservoir pressure 12MPa, formation water salinity 5670mg / L, underground crude oil viscosity 25mPa·s, liquid volume 18m 3 / d, oil volume 0.8t / d, comprehensive water content 92%, corrosion rate of the oil pipe measured was 0.15mm / year, and the concentration of sulfate-reducing bacteria in the produced fluid was 1350 / mL.

[0121] The present invention is used to effectively control the pipeline corrosion of the water well C, and the specific contents are as follows:

[0122] Microbial corrosion control system, the microbial corrosion control system consists of a nutrient system, a bacterial agent system and an auxiliary system, wherein:

[0123] The volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 40:8:50.

[0124] Furthermore, the nutrition system consists of a carbon source, a nitrogen source, a phosphorus source and water.

[0125] Furthermore, based on the mass of the nutrition system, the mass concentration of the carbon source is 1.5%, the mass concentration of the nitrogen source is 0.5%, and the mass concentration of the phosphorus source is 0.1%.

[0126] Furthermore, the carbon source is glucose, sucrose, starch and maltose in equal mass ratios. In another embodiment, the carbon source is sucrose. In another embodiment, the carbon source is maltose.

[0127] Furthermore, the nitrogen source is an organic nitrogen source, which is a mixture of peptone, yeast extract powder, and corn steep powder in equal mass ratios. In another embodiment, the organic nitrogen source is peptone. In another embodiment, the organic nitrogen source is yeast extract powder. In another embodiment, the organic nitrogen source is corn steep powder.

[0128] Furthermore, the phosphorus source is a mixture of dipotassium hydrogen phosphate, sodium dihydrogen phosphate and potassium dihydrogen phosphate in equal mass ratios. In another embodiment, the phosphorus source is dipotassium hydrogen phosphate. In another embodiment, the phosphorus source is sodium dihydrogen phosphate. In another embodiment, the phosphorus source is potassium dihydrogen phosphate.

[0129] Furthermore, the bacterial agent system is composed of fermentation liquid of nitrate-reducing bacteria and water, wherein: based on the total volume of the bacterial agent system, the volume concentration of the fermentation liquid of nitrate-reducing bacteria is 5%.

[0130] Furthermore, the nitrate-reducing bacteria of the bacterial agent system are thermophilic bacillus, Pseudomonas aeruginosa, and Pseudomonas stutzeri, and the present form is the fermentation broth of nitrate-reducing bacteria. In another embodiment, the nitrate-reducing bacteria of the bacterial agent system are thermophilic bacillus. In another embodiment, the nitrate-reducing bacteria of the bacterial agent system are Pseudomonas aeruginosa. In another embodiment, the nitrate-reducing bacteria of the bacterial agent system are Pseudomonas stutzeri.

[0131] Furthermore, the auxiliary system consists of microbial polysaccharides, microbial surfactants and water.

[0132] Furthermore, based on the mass of the auxiliary system, the mass concentration of the microbial polysaccharide is 1%, and the mass concentration of the microbial surfactant is 0.05%.

[0133] Furthermore, the microbial polysaccharide in the auxiliary system is xanthan gum, wellan gum, gellan gum and curdlan gum in equal mass ratios. In another embodiment, the microbial polysaccharide in the auxiliary system is xanthan gum. In another embodiment, the microbial polysaccharide in the auxiliary system is wellan gum. In another embodiment, the microbial polysaccharide in the auxiliary system is gellan gum. In another embodiment, the microbial polysaccharide in the auxiliary system is curdlan gum.

[0134] Furthermore, the microbial surfactant in the auxiliary system is rhamnolipid, sophorolipid and lipopeptide in equal mass ratio. In another embodiment, the microbial surfactant in the auxiliary system is rhamnolipid. In another embodiment, the microbial surfactant in the auxiliary system is sophorolipid. In another embodiment, the microbial surfactant in the auxiliary system is lipopeptide.

[0135] Application of any of the above-mentioned microbial corrosion control systems in oil production.

[0136] The microbial corrosion control system described in any one of the above items is used as a microbial corrosion inhibitor in oil and water wells.

[0137] Furthermore, the specific steps of the above application are as follows:

[0138] 1. The oil and water wells are in abnormal condition due to microbial corrosion, and operations need to be carried out to prepare for the placement of a new completion string. Before placing the new completion string, microbial corrosion control work should be carried out;

[0139] 2. The column is sterilized by pressure control, and the implementation method is as follows:

[0140] After the pipe string is sealed and connected, the pressure is increased to 22MPa, and then the pressure is quickly released. The pressure release time is controlled within 1.5 seconds. The rapid release of pressure is used to rupture the bacteria and destroy the cell wall of harmful bacteria, thereby inhibiting corrosive bacteria. Since the corrosion rate of the oil pipe measured in this well is 0.15mm / year, the pressure control sterilization is carried out 4 times;

[0141] 3. Treat the pipe string with a microbial corrosion control system: Since the corrosion rate of the oil pipe measured in the well is 0.15 mm / year, a 4 mm thick effective bonding coating is applied to the inner and outer surfaces of the pipe string in the microbial corrosion control system;

[0142] 4. The pipe string treated in step (3) is lowered into the well to complete the construction.

[0143] 5. On-site implementation effect tracking

[0144] After the technical solution of the present invention was implemented in the water well CV of the test block, the injection volume was kept high and the injection volume was 65m 3 / d, the actual water injection volume is 68m 3 / d. The sulfate-reducing bacteria detected at the wellhead were below 80 / mL, and the validity period exceeded 13 months. After 13 months, the sulfate-reducing bacteria were measured at 350 / mL. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus twice a month, with an addition amount of 0.2t / time, to maintain the growth of the bacterial agent system in the bonding coating, thereby better inhibiting sulfate-reducing bacteria.

[0145] Embodiment 4:

[0146] The D section of the ground gathering and transportation pipeline of an oil production plant in Shengli Oilfield transports oil well output fluid in the pipeline. The output fluid temperature is 45°C. The corrosion rate of the pipeline is 0.35mm / year, and the concentration of sulfate-reducing bacteria in the pipeline is 2000 / mL.

[0147] The invention is used to effectively control the corrosion of the D section of the ground gathering and transportation pipeline, and the specific contents are as follows:

[0148] The microbial corrosion control system comprises a nutrient system, a bacterial agent system and an auxiliary system, wherein the volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 40:10:50.

[0149] The carbon sources in the nutrition system are sucrose and maltose, with their mass concentrations respectively being 1%. The organic nitrogen source in the nitrogen source is corn syrup powder, with its mass concentration being 0.25%. The inorganic nitrogen source is sodium nitrite, with its mass concentration being 0.5%. The phosphorus source is potassium dihydrogen phosphate, with its mass concentration being 0.2%. The rest is water. The volume of the nutrition system accounts for 40% of the total volume of the microbial corrosion control system.

[0150] The nitrate-reducing bacteria selected in the bacterial agent system are Thermobacterium and Pseudomonas aeruginosa. The volume concentrations of the two bacterial agents are 2.5% and 5% respectively, the total volume concentration is 7.5%, and the rest is water. The volume of the bacterial agent system accounts for 10% of the total volume of the microbial corrosion control system.

[0151] The microbial polysaccharide in the auxiliary system is gellan gum with a mass concentration of 0.75%, the microbial surfactant is lipopeptide with a mass concentration of 0.05%, and the rest is water. The volume of the auxiliary system accounts for 50% of the total volume of the microbial corrosion control system.

[0152] Before on-site implementation, the auxiliary system is prepared separately, and the nutrient system and the microbial agent system are prepared separately and then mixed, and the mixture is set aside for use.

[0153] The application of the above-mentioned microbial corrosion control system in oil production.

[0154] The above-mentioned microbial corrosion control system is used as a microbial corrosion inhibitor in ground gathering and transportation pipelines.

[0155] 1. Before the ground pipeline is put into use, preparations have been made to connect new pipelines;

[0156] 2. The pipeline was sterilized by pressure control. After the pipeline was sealed and connected, the pressure was increased to 15MPa, and then the pressure was quickly released. The pressure release time was 0.5 seconds. Since the corrosion rate of the oil pipe measured in the well was 0.35mm / year, the pressure control sterilization was carried out 10 times;

[0157] 3. After the pressure control sterilization is completed, the pipeline is treated with the microbial corrosion control system, and the pipe column is coated with the prepared microbial corrosion control system. The coating bonding thickness is determined to be 4mm according to the corrosion rate;

[0158] 4. After the above steps are completed, lower the pipe string into the well to complete the construction.

[0159] 5. On-site implementation effect tracking

[0160] After the present invention was implemented in the D section of the ground gathering and transportation pipeline, the efficient transportation capacity was maintained, and the validity period exceeded 24 months. After 24 months, the sulfate-reducing bacteria were measured at 450 / mL. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus twice a month, and the addition amount was 0.1t / time to maintain the growth of the bacterial agent system in the bonding coating, so as to better inhibit sulfate-reducing bacteria.

[0161] Embodiment 5:

[0162] Section E of the ground gathering and transportation pipeline of an oil production plant in Shengli Oilfield transports oil well output fluid in the pipeline. The output fluid temperature is 43°C. The corrosion rate of the pipeline is 0.25 mm / year, and the concentration of sulfate-reducing bacteria in the pipeline is 1500 / mL.

[0163] The invention is used to effectively control the corrosion of the E section of the ground gathering and transportation pipeline, and the specific contents are as follows:

[0164] The microbial corrosion control system comprises a nutrient system, a bacterial agent system and an auxiliary system, wherein the volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 50:5:45.

[0165] The carbon sources in the nutrition system are sucrose and maltose, with their mass concentrations being 2% respectively; the organic nitrogen source in the nitrogen source is corn syrup powder, with a mass concentration of 0.5%; the inorganic nitrogen source is sodium nitrite, with a mass concentration of 0.5%; the phosphorus source is potassium dihydrogen phosphate, with a mass concentration of 0.2%; and the rest is water. The volume of the nutrition system accounts for 50% of the total volume of the microbial corrosion control system.

[0166] The nitrate-reducing bacteria selected in the bacterial agent system are Thermobacterium spp. and Pseudomonas aeruginosa. The volume concentrations of the two bacterial agents are 2.5% and 5% respectively, the total volume concentration is 7.5%, and the rest is water. The volume of the bacterial agent system accounts for 5 of the total volume of the microbial corrosion control system.

[0167] The microbial polysaccharide in the auxiliary system is gellan gum with a mass concentration of 0.75%, the microbial surfactant is lipopeptide with a mass concentration of 0.05%, and the rest is water. The volume of the auxiliary system accounts for 45% of the total volume of the microbial corrosion control system.

[0168] Before on-site implementation, the auxiliary system is prepared separately, and the nutrient system and the microbial agent system are prepared separately and then mixed, and the mixture is set aside for use.

[0169] The application of the above-mentioned microbial corrosion control system in oil production.

[0170] The above-mentioned microbial corrosion control system is used as a microbial corrosion inhibitor in ground gathering and transportation pipelines.

[0171] 1. Before the ground pipeline is put into use, preparations have been made to connect new pipelines;

[0172] 2. The pipeline was sterilized by pressure control. After the pipeline was sealed and connected, the pressure was increased to 20MPa, and then the pressure was quickly released. The pressure release time was 1 second. Since the corrosion rate of the oil pipe measured in the well was 0.25mm / year, the pressure control sterilization was carried out 4 times;

[0173] 3. After the pressure control sterilization is completed, the pipeline is treated with the microbial corrosion control system, and the pipe column is coated with the prepared microbial corrosion control system. The coating bonding thickness is determined to be 2mm according to the corrosion rate;

[0174] 4. After the above steps are completed, lower the pipe string into the well to complete the construction.

[0175] 5. On-site implementation effect tracking

[0176] After the present invention was implemented in the E section of the ground gathering and transportation pipeline, the efficient transportation capacity was maintained, and the validity period exceeded 26 months. After 26 months, the sulfate-reducing bacteria were measured at 430 / mL. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus once a month, and the addition amount was 0.3t / time to maintain the growth of the bacterial agent system in the bonding coating, so as to better inhibit sulfate-reducing bacteria.

[0177] Embodiment 6:

[0178] The F section of the ground gathering and transportation pipeline of an oil production plant in Shengli Oilfield transports oil well output fluid with a temperature of 40°C. The corrosion rate of the pipeline is 0.12 mm / year and the concentration of sulfate-reducing bacteria in the pipeline is 1200 / mL.

[0179] The invention is used to effectively control the corrosion of the E section of the ground gathering and transportation pipeline, and the specific contents are as follows:

[0180] The microbial corrosion control system comprises a nutrient system, a bacterial agent system and an auxiliary system, wherein the volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is 50:10:40.

[0181] The carbon sources in the nutrition system are sucrose and maltose, with their mass concentrations being 2% respectively; the organic nitrogen source in the nitrogen source is corn syrup powder, with a mass concentration of 0.5%; the inorganic nitrogen source is sodium nitrite, with a mass concentration of 0.5%; the phosphorus source is potassium dihydrogen phosphate, with a mass concentration of 0.2%; and the rest is water. The volume of the nutrition system accounts for 50% of the total volume of the microbial corrosion control system.

[0182] The nitrate-reducing bacteria selected in the bacterial agent system are Thermobacterium truncatum and Pseudomonas aeruginosa. The volume concentrations of the two bacterial agents are 2.5% and 5% respectively, the total volume concentration is 7.5%, and the rest is water. The volume of the bacterial agent system accounts for 10 of the total volume of the microbial corrosion control system.

[0183] The microbial polysaccharide in the auxiliary system is gellan gum with a mass concentration of 0.75%, the microbial surfactant is lipopeptide with a mass concentration of 0.05%, and the rest is water. The volume of the auxiliary system accounts for 40% of the total volume of the microbial corrosion control system.

[0184] Before on-site implementation, the auxiliary system is prepared separately, and the nutrient system and the microbial agent system are prepared separately and then mixed, and the mixture is set aside for use.

[0185] The application of the above-mentioned microbial corrosion control system in oil production.

[0186] The above-mentioned microbial corrosion control system is used as a microbial corrosion inhibitor in ground gathering and transportation pipelines.

[0187] 1. Before the ground pipeline is put into use, preparations have been made to connect new pipelines;

[0188] 2. The pipeline was sterilized by pressure control. After the pipeline was sealed and connected, the pressure was increased to 18MPa, and then the pressure was quickly released. The pressure release time was 0.75 seconds. Since the corrosion rate of the oil pipe measured in the well was 0.12mm / year, the pressure control sterilization was carried out 3 times;

[0189] 3. After the pressure control sterilization is completed, the pipeline is treated with the microbial corrosion control system, and the pipe column is coated with the prepared microbial corrosion control system. The coating bonding thickness is determined to be 1.5 mm according to the corrosion rate;

[0190] 4. After the above steps are completed, lower the pipe string into the well to complete the construction.

[0191] 5. On-site implementation effect tracking

[0192] After the present invention was implemented in the E section of the ground gathering and transportation pipeline, the efficient transportation capacity was maintained, and the validity period exceeded 27 months. After 27 months, the sulfate-reducing bacteria were measured at 390 / mL. In order to ensure the long-term effect of microbial corrosion control, it was decided to add the nutrient system part of the microbial corrosion control system through the oil casing annulus once a month, and the addition amount was 0.2t / time to maintain the growth of the bacterial agent system in the bonding coating, so as to better inhibit sulfate-reducing bacteria.

Claims

1. A microbial corrosion control system, characterized in that: The microbial corrosion control system is composed of a nutrient system, a bacterial agent system and an auxiliary system, wherein: The volume ratio of the nutrient system, the bacterial agent system and the auxiliary system is (40-60):(5-10):(30-50).

2. A microbial corrosion control system according to claim 1, characterized in that: The nutrition system consists of a carbon source, a nitrogen source, a phosphorus source and water.

3. A microbial corrosion control system as claimed in claim 2, characterized in that: Based on the mass of the nutrition system, the mass concentration of the carbon source is 1-2%, the mass concentration of the nitrogen source is 0.5-1%, and the mass concentration of the phosphorus source is 0.1-0.3%.

4. A microbial corrosion control system as claimed in claim 2, characterized in that: The carbon source is one or more of glucose, sucrose, starch and maltose.

5. A microbial corrosion control system as claimed in claim 2, characterized in that: The nitrogen source is an organic nitrogen source and / or an inorganic nitrogen source, wherein: The organic nitrogen source is one or more of peptone, yeast extract powder and corn steep liquor powder; the inorganic nitrogen source is one or more of sodium nitrate, ammonium nitrate and sodium nitrite.

6. A microbial corrosion control system according to claim 2, characterized in that: The phosphorus source is one or more of dipotassium hydrogen phosphate, sodium dihydrogen phosphate and potassium dihydrogen phosphate.

7. A microbial corrosion control system according to claim 1, characterized in that: The bacterial agent system is composed of fermentation liquid of nitrate-reducing bacteria and water, wherein: based on the total volume of the bacterial agent system, the volume concentration of the fermentation liquid of nitrate-reducing bacteria is 5-20%, preferably 5-10%.

8. A microbial corrosion control system according to claim 7, characterized in that: The nitrate-reducing bacteria in the bacterial agent system are one or more of Thermobacterium thermophilum, Pseudomonas aeruginosa and Pseudomonas stutzeri.

9. A microbial corrosion control system according to claim 1, characterized in that: The auxiliary system consists of microbial polysaccharide, microbial surfactant and water.

10. A microbial corrosion control system according to claim 9, characterized in that: Based on the mass of the auxiliary system, the mass concentration of the microbial polysaccharide is 0.5-1%, and the mass concentration of the microbial surfactant is 0.05-0.1%.

11. A microbial corrosion control system according to claim 9, characterized in that: The microbial polysaccharide in the auxiliary system is one or more of xanthan gum, welan gum, gellan gum and curdlan gum.

12. A microbial corrosion control system according to claim 9, characterized in that: The microbial surfactant in the auxiliary system is one or more of rhamnolipid, sophorolipid and lipopeptide.

13. Use of the microbial corrosion control system according to any one of claims 1 to 12 in oil production.

14. Use of the microbial corrosion control system according to any one of claims 1 to 12 as a microbial corrosion inhibitor in oil and water wells.

15. The use according to claim 14, characterized in that The specific steps of the above application are as follows: (1) When the well condition of an oil or water well becomes abnormal due to microbial corrosion or a new well is put into production, it is necessary to carry out operations and prepare to run a new completion string. Before running the new completion string, microbial corrosion control work must be done; (2) Sterilize the tubing column by pressure control, and the implementation method is as follows: After the pipe string is sealed and connected, the pressure is increased to 20-25MPa, and then the pressure is quickly released. The pressure release time is controlled within 1-2 seconds. The rapid release of pressure is used to rupture the bacteria and destroy the cell walls of harmful bacteria, thereby inhibiting corrosive bacteria. The number of pressure-controlled sterilization times is determined based on the measurement results of the corrosion rate of the oil and water wells themselves; (3) Treating the tubing with a microbial corrosion control system: Based on the results of the corrosion rate measurements of the oil and water wells themselves, a certain thickness of effective adhesive coating is applied to the inner and outer surfaces of the tubing with the microbial corrosion control system; (4) The pipe string treated in step (3) is lowered into the well to complete the construction.

16. The use according to claim 15, characterized in that The method also includes step (5) of effect tracking, which includes regularly detecting the concentration of sulfate-reducing bacteria in the wellhead produced fluid, and regularly adding the nutrient system part of the microbial corrosion control system through the casing annulus according to the concentration of sulfate-reducing bacteria, with the addition amount being 0.1-0.2 t / month, wherein: the relationship between the concentration of sulfate-reducing bacteria and the frequency of adding the nutrient system is selected as shown in the following table: 。 17. The use according to claim 15, characterized in that In step (2), according to the existing corrosion rate measurement results of the oil and water wells themselves, the number of pressure-controlled sterilization is selected as follows: The existing corrosion rate of oil and water wells is less than 0.08mm / year, and pressure control sterilization is performed once; 0.08mm / year≤The existing corrosion rate of oil and water wells≤0.1mm / year, pressure control sterilization 1-3 times; 0.1mm / year<The existing corrosion rate of oil and water wells is ≤0.3mm / year, and pressure control sterilization is performed 3-5 times; The existing corrosion rate of the water well itself is > 0.3mm / year, and pressure control sterilization is performed at least 8 times.

18. The use according to claim 15, characterized in that In step (3), according to the results of the measurement of the corrosion rate of the oil and water wells themselves, the selection of applying a layer of effective adhesive coating of a certain thickness on the inner and outer surfaces of the pipe string in the microbial corrosion control system is as follows: The existing corrosion rate of oil and water wells is less than 0.08mm / year, and the thickness of the bonding coating is 0.5mm≤≤1mm; 0.08mm / year≤The existing corrosion rate of oil and water wells≤0.1mm / year, 1mm<The thickness of the bonding coating≤1.5mm; 0.1mm / year<the existing corrosion rate of oil and water wells≤0.3mm / year, 1.5mm<the thickness of the bonding coating≤3mm; The corrosion rate of the well itself is >0.3mm / year, and the thickness of the bonding coating is >3mm.

19. Use of the microbial corrosion control system according to any one of claims 1 to 12 as a microbial corrosion inhibitor in ground gathering and transportation pipelines.

20. The use according to claim 19, characterized in that The specific steps of the above application are as follows: (1) The surface gathering and transportation pipeline has abnormal well conditions due to microbial corrosion or the surface pipeline is newly put into use. It is necessary to carry out construction, prepare new transmission pipelines, and perform microbial corrosion control on the new transmission pipelines; (2) Pressure control sterilization is performed on the ground gathering and transportation pipeline by the pressure control method. The implementation method is as follows: After the pipeline is sealed and connected, the pressure is increased to 15-20MPa, and then the pressure is quickly released. The pressure release time is controlled within 0.5-1 second. The rapid release of pressure is used to rupture the bacteria and destroy the cell walls of harmful bacteria, thereby inhibiting corrosive bacteria. According to the measurement results of the corrosion rate of the ground gathering and transportation pipeline itself, the number of pressure control sterilization is determined; (3) Treat the new transmission pipe with the microbial corrosion control system: Based on the corrosion rate test results of the surface gathering and transportation pipeline itself, apply a certain thickness of effective adhesive coating to the inner surface of the pipe with the microbial corrosion control system; (4) Connect the delivery pipeline processed in step (3) to complete the construction.

21. The use according to claim 20, characterized in that It also includes (5) effect tracking: regularly detecting the concentration of sulfate-reducing bacteria in the pipe-transported liquid, and regularly adding the nutrient system part of the microbial corrosion control system through the pipe inlet according to the concentration of sulfate-reducing bacteria, with the addition amount being 0.2-0.4t / month, wherein: the relationship between the concentration of sulfate-reducing bacteria and the frequency of adding the nutrient system is selected as shown in the following table:

22. The use according to claim 20, characterized in that In step (2), according to the existing corrosion rate measurement results of the ground gathering and transportation pipeline itself, the number of pressure-controlled sterilization is selected as follows: The existing corrosion rate of the ground gathering and transportation pipeline is less than 0.08mm / year, and the pressure control sterilization is performed once; 0.08mm / year≤The existing corrosion rate of the ground gathering and transportation pipeline is ≤0.1mm / year, and the pressure is controlled and sterilized 1-3 times; 0.1mm / year<The existing corrosion rate of the ground gathering and transportation pipeline itself is ≤0.3mm / year, and the pressure is controlled and sterilized 3-5 times; The existing corrosion rate of the ground gathering and transportation pipeline itself is greater than 0.3mm / year, and pressure control sterilization is performed at least 8 times.

23. The use according to claim 20, characterized in that In step (3), according to the existing corrosion rate measurement results of the surface gathering and transportation pipeline itself, the microbial corrosion control system is coated on the inner surface of the pipe column with a layer of effective bonding coating of a certain thickness, and the selection is as follows: The existing corrosion rate of the ground gathering and transportation pipeline itself is less than 0.08mm / year, and the thickness of the bonding coating is 1mm≤≤1.5mm; 0.08mm / year≤The existing corrosion rate of the ground gathering and transportation pipeline itself≤0.1mm / year, 1.5mm<The thickness of the bonding coating≤2mm; 0.1mm / year<The existing corrosion rate of the ground gathering and transportation pipeline itself≤0.3mm / year, 2.5mm≤The thickness of the bonding coating≤3.5mm; The existing corrosion rate of the ground gathering and transportation pipeline itself is greater than 0.3mm / year, and the thickness of the bonding coating is greater than 3.5mm.

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