Microbial activator for oil reservoir with high wax content and application of microbial activator

Abstract

The invention relates to a microbial activator for a high-wax-content oil reservoir and application of the microbial activator, and belongs to the technical field of oil exploitation. The activating agent comprises the following components: glucose, sodium nitrate, sodium chloride, magnesium sulfate, yeast extract, dipotassium phosphate, monopotassium phosphate and trace elements; the activator can be injected into a producing well to activate microorganisms in the producing well, and the activated microorganisms can act with crude oil, so that the wax content and the freezing point of the high-wax-content crude oil are reduced, the fluidity of the crude oil is enhanced, the yield of the oil well is improved, the lifting difficulty is reduced, and the crude oil is easy to flow out of a shaft. The activator has the characteristics of low corrosivity, no secondary pollution, low cost and the like, can be used for improving the single well yield of the high wax content reservoir, and meets the requirements of oil field production.

Description

Technical Field

[0001] The present application relates to the technical field of oil production, and in particular to a microbial activator for high-wax oil reservoirs and its application. Background Art

[0002] For high-wax oil reservoirs with shallow burial depth and low formation temperature, conventional water injection development is very likely to cause cold damage to the formation. The injection of low-temperature cold water causes the temperature of the oil layer to drop. When the temperature drops to near or below the freezing point of crude oil, the crude oil precipitates wax and increases viscosity. The wax will block the rock pores, resulting in reduced reservoir permeability and increased seepage resistance. At the same time, high-wax oil wells also have the problem of crude oil wax precipitation caused by lowering temperature during the lifting process. In conventional pipe and rod production, a large amount of wax precipitation leads to excessive load, slow well lowering, pipe and rod eccentric wear, and even rod breakage.

[0003] At present, there is no good means to improve the recovery rate of low-temperature and high-wax oil reservoirs developed by conventional water injection. More research focuses on oil well cleaning and wax prevention. The first is hot washing and wax removal, which removes wellbore wax through periodic hot water washing, but frequent well shut-in operations affect the production capacity of oil wells, increase oil production costs, and reduce economic benefits; the second is electric heating of the oil rod to increase the wellbore temperature to avoid crude oil wax precipitation. This method consumes a lot of energy and has high oil production costs; the third is chemical wax prevention, which slows down wellbore wax deposition by regular drug addition. It has a short effective period, high cost, and is easy to pollute the environment. The above can only solve the problem of wax deposition in oil wells. There are studies on the use of microorganisms to increase the production of high-wax oil wells, but during the implementation process, air and water-based wax removal and prevention agents need to be injected. The process is complicated and the risk is relatively high, and the use of chemical wax removal and prevention agents has not been completely eliminated. Summary of the invention

[0004] The present application provides a microbial activator for high-wax oil reservoirs and its application, so as to get rid of the use of chemical wax removal and prevention agents.

[0005] In a first aspect, the present application provides a high-wax oil reservoir microbial activator, the ingredients of the activator including: glucose, sodium nitrate, sodium chloride, magnesium sulfate, yeast extract, dipotassium hydrogen phosphate, potassium dihydrogen phosphate and trace elements.

[0006] As an optional embodiment, the components of the activator include, by mass fraction: 0.1% to 0.2% glucose, 0.2% to 0.45% sodium nitrate, 0.03% to 0.1% sodium chloride, 0.01% to 0.025% magnesium sulfate, 0.05% to 0.2% yeast extract, 0.2% to 0.5% dipotassium hydrogen phosphate, 0.2% to 0.35% potassium dihydrogen phosphate and 0.1% to 0.17% trace element components.

[0007] As an optional embodiment, the components of the activator include, by mass fraction: 0.12% to 0.18% glucose, 0.25% to 0.4% sodium nitrate, 0.04% to 0.09% sodium chloride, 0.015% to 0.020% magnesium sulfate, 0.1% to 0.15% yeast extract, 0.3% to 0.4% dipotassium hydrogen phosphate, 0.25% to 0.3% potassium dihydrogen phosphate and 0.12% to 0.15% trace element components.

[0008] As an optional embodiment, the components of the activator include, by mass fraction: 0.14% to 0.16% glucose, 0.3% to 0.35% sodium nitrate, 0.05% to 0.08% sodium chloride, 0.016% to 0.018% magnesium sulfate, 0.12% to 0.13% yeast extract, 0.33% to 0.37% dipotassium hydrogen phosphate, 0.27% to 0.28% potassium dihydrogen phosphate and 0.13% to 0.14% trace element components.

[0009] As an optional embodiment, the trace element component includes: boric acid, sodium citrate, manganese sulfate, sodium molybdate, trichloride, zinc sulfate, copper sulfate and cobalt chloride.

[0010] As an optional embodiment, the components of the trace element component include, by mass concentration: 0.4-0.6 g / L boric acid, 1.5-2.5 g / L sodium citrate, 2.5-3.5 g / L manganese sulfate, 0.05-0.15 g / L sodium molybdate, 0.2-0.4 g / L ferric chloride, 1-1.4 g / L zinc sulfate, 1-1.4 g / L copper sulfate and 1-1.4 g / L cobalt chloride.

[0011] As an optional embodiment, the ingredients of the trace element component include, by mass concentration: 0.5 g / L boric acid, 2 g / L sodium citrate, 3 g / L manganese sulfate, 0.1 g / L sodium molybdate, 0.28 g / L ferric chloride, 1.2 g / L zinc sulfate, 1.2 g / L copper sulfate and 1.2 g / L cobalt chloride.

[0012] In a second aspect, the present application provides an application of a high-wax oil reservoir microbial activator, wherein the activator is the high-wax oil reservoir microbial activator described in the first aspect, and the application includes applying the activator to oil production.

[0013] As an optional embodiment, the application of the activator to oil production includes:

[0014] The activator is formulated into an activation solution;

[0015] The activation solution is injected into an oil production well or an oil production well to activate the microorganisms in the formation to react with the crude oil.

[0016] As an optional embodiment, the microorganisms include hydrocarbon oxidizing functional microorganisms.

[0017] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0018] The activator provided in the embodiment of the present application can be injected into an oil well to activate the microorganisms in the oil well. The activated microorganisms can react with crude oil, thereby reducing the wax content and freezing point of high-wax crude oil, enhancing the fluidity of crude oil, increasing the production of oil wells while reducing the difficulty of lifting, and making it easier for crude oil to flow out of the wellbore. The activator has the characteristics of low corrosiveness, no secondary pollution, and low cost, and can be used to increase the single well production of high-wax oil reservoirs to meet the needs of oil field production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic diagram of the application process of the activator provided in the embodiment of the present application;

[0022] Figure 2 A schematic diagram of the injection process provided in Example 1 of the present application;

[0023] Figure 3 Schematic diagram of the injection process provided for Examples 2 and 3 of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0026] The embodiment of the present application provides a high-wax oil reservoir microorganism activator, and the ingredients of the activator include: glucose, sodium nitrate, sodium chloride, magnesium sulfate, yeast extract, dipotassium hydrogen phosphate, potassium dihydrogen phosphate and trace elements.

[0027] In some embodiments, the components of the activator include, by mass fraction: 0.1% to 0.2% glucose, 0.2% to 0.45% sodium nitrate, 0.03% to 0.1% sodium chloride, 0.01% to 0.025% magnesium sulfate, 0.05% to 0.2% yeast extract, 0.2% to 0.5% dipotassium hydrogen phosphate, 0.2% to 0.35% potassium dihydrogen phosphate and 0.1% to 0.17% trace element components. Furthermore, the components of the activator include, by mass fraction, 0.12% to 0.18% glucose, 0.25% to 0.4% sodium nitrate, 0.04% to 0.09% sodium chloride, 0.015% to 0.020% magnesium sulfate, 0.1% to 0.15% yeast extract, 0.3% to 0.4% dipotassium hydrogen phosphate, 0.25% to 0.3% potassium dihydrogen phosphate and 0.12% to 0.15% trace element components. Furthermore, the components of the activator include, by mass fraction, 0.14% to 0.16% glucose, 0.3% to 0.35% sodium nitrate, 0.05% to 0.08% sodium chloride, 0.016% to 0.018% magnesium sulfate, 0.12% to 0.13% yeast extract, 0.33% to 0.37% dipotassium hydrogen phosphate, 0.27% to 0.28% potassium dihydrogen phosphate and 0.13% to 0.14% trace element components.

[0028] In some embodiments, the components of the trace element component include: boric acid, sodium citrate, manganese sulfate, sodium molybdate, trichloride, zinc sulfate, copper sulfate and cobalt chloride. Wherein, the components of the trace element component include by mass concentration: boric acid 0.4-0.6g / L, sodium citrate 1.5-2.5g / L, manganese sulfate 2.5-3.5g / L, sodium molybdate 0.05-0.15g / L, ferric chloride 0.2-0.4g / L, zinc sulfate 1-1.4g / L, copper sulfate 1-1.4g / L and cobalt chloride 1-1.4g / L. Further, the components of the trace element component include by mass concentration: boric acid 0.5g / L, sodium citrate 2g / L, manganese sulfate 3g / L, sodium molybdate 0.1g / L, ferric chloride 0.28g / L, zinc sulfate 1.2g / L, copper sulfate 1.2g / L and cobalt chloride 1.2g / L.

[0029] The activator can be injected into oil wells to activate the microorganisms in the oil wells and prolong the action time of hydrocarbon oxidizing bacteria. The activated microorganisms can react with crude oil. After the reaction with crude oil, the freezing point is reduced by 11°C, the wax content is reduced by 13.8%, and the viscosity of crude oil is reduced by 57%. It can reduce the wax content and freezing point of high-wax crude oil, enhance the fluidity of crude oil, increase the production of oil wells, reduce the difficulty of lifting, and make crude oil easy to flow out of the wellbore. The activator has the characteristics of low corrosiveness, no secondary pollution, and low cost. It can be used to increase the single well production of high-wax oil reservoirs and meet the needs of oil field production.

[0030] Based on a general inventive concept, an embodiment of the present application further provides an application of a high-wax oil reservoir microbial activator, wherein the activator is the high-wax oil reservoir microbial activator provided above, and the application includes applying the activator to oil production.

[0031] Figure 1 A schematic diagram of the application process of the activator provided in the embodiment of the present application, such as Figure 1 As shown, in some embodiments, applying the activator to oil production includes:

[0032] S1. Prepare an activator into an activation solution;

[0033] S2. Injecting the activation solution into an oil production well or a water injection well to activate the microorganisms in the formation to interact with the crude oil.

[0034] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0035] Example 1

[0036] The invention discloses a microorganism activator for high wax content oil reservoirs. The activator formula includes 0.1% glucose, 0.2% sodium nitrate, 0.05% sodium chloride, 0.015% magnesium sulfate, 0.1% yeast extract, 0.25% dipotassium hydrogen phosphate, 0.25% potassium dihydrogen phosphate and 0.12% trace elements.

[0037] Trace element formula: boric acid 0.5g / L, sodium citrate 2g / L, manganese sulfate 3g / L, sodium molybdate 0.1g / L, ferric chloride 0.28g / L, zinc sulfate 1.2g / L, copper sulfate 1.2g / L, cobalt chloride 1.2g / L.

[0038] The activator was applied to the HB Oilfield Quan 42-36X Well for field oil displacement test. Figure 2This is a schematic diagram of the injection process. The on-site preparation and injection process are as follows:

[0039] 1. Turn on the water adding switch, add clean water or sewage to 1 / 3 of the pool, and then add the required amount of glucose (crushed and added);

[0040] 2. When clean water or sewage is added to 1 / 2 of the pool, turn on the agitator switch and start stirring;

[0041] 3. While stirring, continue to add clean water or sewage and add other reagents in sequence;

[0042] 4. After all the reagents have been added, stop adding water when the clean water or sewage is 20 cm from the top of the pool and continue stirring;

[0043] 5. Reverse the process and inject the prepared nutrient solution into the injection well together with the online water injection process.

[0044] Field tests have shown that after the activator was injected into the well 42-36X, the concentration of hydrocarbon oxidizing bacteria in the production fluid of the corresponding wells 42-32X and 42-33X1 increased effectively, from 5×10 4 The number of cells / ml increased to 4.1×10 6 / ml, the wax content of crude oil decreased, the freezing point decreased, the emulsification condition improved, and the maximum upward current decreased, indicating that it played a role in reducing the load on the oil well, with a cumulative increase in oil production of 550 tons.

[0045] Example 2

[0046] A microbial activator for high-wax oil reservoirs, the activator formula of which is as follows: 0.2% glucose, 0.45% sodium nitrate, 0.1% sodium chloride, 0.025% magnesium sulfate, 0.2% yeast extract, 0.5% dipotassium hydrogen phosphate, 0.35% potassium dihydrogen phosphate, and 0.17% trace elements.

[0047] Trace element formula: boric acid 0.5g / L, sodium citrate 2g / L, manganese sulfate 3g / L, sodium molybdate 0.1g / L, ferric chloride 0.28g / L, zinc sulfate 1.2g / L, copper sulfate 1.2g / L, cobalt chloride 1.2g / L.

[0048] The activator was applied to the HB Oilfield Quan 42-61X Well for field oil displacement test. Figure 3 This is a schematic diagram of the injection process. The on-site preparation and injection process are as follows:

[0049] 1. Turn on the water adding switch, add clean water or sewage to 1 / 3 of the pool, and then add the required amount of glucose (crushed and added);

[0050] 2. When clean water or sewage is added to 1 / 2 of the pool, turn on the agitator switch and start stirring;

[0051] 3. While stirring, continue to add clean water or sewage and add other reagents in sequence;

[0052] 4. After all the reagents have been added, stop adding water when the clean water or sewage is 20 cm from the top of the pool and continue stirring;

[0053] 5. Use a pump truck to inject the prepared activator from the annulus of the oil well, and maintain the injection speed and displacement at 20-30m 3 / h, the injection pressure is controlled timely according to the water absorption conditions.

[0054] Before the measures were taken, the crude oil contained 40.3% wax, 41°C freezing point, 0.7 tons of oil per day, and 90% water. After the injection of the activator, the hydrocarbon oxidizing bacteria were effectively activated, and the bacterial concentration increased from 4.3×10 4 The number of cells / ml increased to 6.2×10 6 / ml, the properties of crude oil are significantly improved, the wax content is reduced by 21%, the freezing point is reduced to 35℃, the daily oil production is increased to 2.9 tons, the water content is reduced to 63%, the cumulative oil production is increased by 475 tons, and the effective period can reach more than 1 year.

[0055] Example 3

[0056] A microbial activator for high-wax oil reservoirs, the activator formula of which is as follows: 0.15% glucose, 0.35% sodium nitrate, 0.08% sodium chloride, 0.02% magnesium sulfate, 0.15% yeast extract, 0.35% dipotassium hydrogen phosphate, 0.3% potassium dihydrogen phosphate, and 0.15% trace elements.

[0057] Trace element formula: boric acid 0.5g / L, sodium citrate 2g / L, manganese sulfate 3g / L, sodium molybdate 0.1g / L, ferric chloride 0.28g / L, zinc sulfate 1.2g / L, copper sulfate 1.2g / L, cobalt chloride 1.2g / L.

[0058] The activator was applied to the HB Oilfield Quan 42-31X Well for field oil displacement test. Figure 3 This is a schematic diagram of the injection process. The on-site preparation and injection process are as follows:

[0059] 1. Turn on the water adding switch, add clean water or sewage to 1 / 3 of the pool, and then add the required amount of glucose (crushed and added);

[0060] 2. When clean water or sewage is added to 1 / 2 of the pool, turn on the agitator switch and start stirring;

[0061] 3. While stirring, continue to add clean water or sewage and add other reagents in sequence;

[0062] 4. After all the reagents have been added, stop adding water when the clean water or sewage is 20 cm from the top of the pool and continue stirring;

[0063] 5. Use a pump truck to inject the prepared activator from the annulus of the oil well, and maintain the injection speed and displacement at 20-30m 3 / h, the injection pressure is controlled timely according to the water absorption conditions.

[0064] Before the measures were taken, the crude oil contained 41.5% wax, 40°C freezing point, 0.2 tons of oil per day, and 83.3% water. After the injection of the activator, the hydrocarbon oxidizing bacteria were effectively activated, and the bacterial concentration increased from 3.7×10 4 The number of cells / ml increased to 5×10 6 / ml, the properties of crude oil are significantly improved, the wax content is reduced by 19%, the freezing point is reduced to 34℃, the daily oil production is increased to 1.2 tons, the water content is reduced to 33%, the cumulative oil production is increased by 315 tons, and the effective period can reach more than 1 year.

[0065] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0066] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0067] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A high wax content oil reservoir microbial activator, characterized in that: The components of the activator include glucose, sodium nitrate, sodium chloride, magnesium sulfate, yeast extract, dipotassium hydrogen phosphate, potassium dihydrogen phosphate and trace elements.

2. The high wax content oil reservoir microbial activator according to claim 1, characterized in that: The components of the activator include, by mass fraction, 0.1% to 0.2% of glucose, 0.2% to 0.45% of sodium nitrate, 0.03% to 0.1% of sodium chloride, 0.01% to 0.025% of magnesium sulfate, 0.05% to 0.2% of yeast extract, 0.2% to 0.5% of dipotassium hydrogen phosphate, 0.2% to 0.35% of potassium dihydrogen phosphate and 0.1% to 0.17% of trace element components.

3. The high wax content oil reservoir microbial activator according to claim 1, characterized in that: The components of the activator include, by mass fraction, 0.12%-018% of glucose, 0.25%-0.4% of sodium nitrate, 0.04%-0.09% of sodium chloride, 0.015%-0.020% of magnesium sulfate, 0.1%-0.15% of yeast extract, 0.3%-0.4% of dipotassium hydrogen phosphate, 0.25%-0.3% of potassium dihydrogen phosphate and 0.12%-0.15% of trace element components.

4. The high wax content oil reservoir microbial activator according to claim 1, characterized in that: The components of the activator include, by mass fraction, 0.14%-016% of glucose, 0.3%-0.35% of sodium nitrate, 0.05%-0.08% of sodium chloride, 0.016%-0.018% of magnesium sulfate, 0.12%-0.13% of yeast extract, 0.33%-0.37% of dipotassium hydrogen phosphate, 0.27%-0.28% of potassium dihydrogen phosphate and 0.13%-0.14% of trace element components.

5. The high wax content oil reservoir microbial activator according to any one of claims 1 to 4, characterized in that: The components of the trace element composition include: boric acid, sodium citrate, manganese sulfate, sodium molybdate, trichloride, zinc sulfate, copper sulfate and cobalt chloride.

6. The high wax content oil reservoir microbial activator according to claim 5, characterized in that: The components of the trace element component include, by mass concentration, 0.4-0.6 g / L of boric acid, 1.5-2.5 g / L of sodium citrate, 2.5-3.5 g / L of manganese sulfate, 0.05-0.15 g / L of sodium molybdate, 0.2-0.4 g / L of ferric chloride, 1-1.4 g / L of zinc sulfate, 1-1.4 g / L of copper sulfate and 1-1.4 g / L of cobalt chloride.

7. The high wax content oil reservoir microbial activator according to claim 5, characterized in that: The components of the trace element component include, by mass concentration, 0.5 g / L boric acid, 2 g / L sodium citrate, 3 g / L manganese sulfate, 0.1 g / L sodium molybdate, 0.28 g / L ferric chloride, 1.2 g / L zinc sulfate, 1.2 g / L copper sulfate and 1.2 g / L cobalt chloride.

8. An application of a microbial activator for high wax content oil reservoirs, characterized in that: The activator is the high wax content oil reservoir microorganism activator according to any one of claims 1 to 7, and the application includes applying the activator to oil production.

9. The use of the high wax content oil reservoir microbial activator according to claim 8, characterized in that: The application of the activator to oil production comprises: The activator is formulated into an activation solution; The activation solution is injected into an oil production well or a water injection well to activate the microorganisms in the formation to react with the crude oil.

10. The use of the high wax content oil reservoir microbial activator according to claim 8, characterized in that: The microorganisms include hydrocarbon oxidizing functional microorganisms.

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