CN108915637B - Wax inhibitor added during fracturing construction and preparation method and application thereof - Google Patents
Wax inhibitor added during fracturing construction and preparation method and application thereof Download PDFInfo
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- CN108915637B CN108915637B CN201810738381.1A CN201810738381A CN108915637B CN 108915637 B CN108915637 B CN 108915637B CN 201810738381 A CN201810738381 A CN 201810738381A CN 108915637 B CN108915637 B CN 108915637B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention provides a paraffin inhibitor added in fracturing construction, which consists of the following raw materials in percentage by weight: 10-20% of sodium stearate, 0-20% of peregal O-2510, 10-15% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 5-10% of sodium dodecyl benzene sulfonate ABS, 0.5-1% of sodium ethylene diamine tetracetate, 1-2% of rosin powder and the balance of quartz sand. Meanwhile, the invention also provides a preparation method and application of the wax inhibitor. The paraffin inhibitor provided by the invention does not need to be separately constructed, is added during fracturing construction, can penetrate into the far end of the stratum, increases the action range of the paraffin inhibitor in the stratum, has long effective time, and can be slowly released for about 2 years in the stratum at 30 ℃; the wax control is started before the crude oil is not produced, so that the source of the wax production is directly cut off, and the wax production is fundamentally prevented; construction is convenient, and construction cost is saved.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to an anti-wax agent added during fracturing construction, and a preparation method and application thereof.
Background
When crude oil is not produced, the crude oil is always in a stratum, the temperature and the pressure of the surrounding environment are high, and some high-carbon-number alkanes are dissolved in the crude oil in a liquid phase, such as: waxes, gums and asphaltenes. In the process of developing, crude oil flows to the bottom of a well from a stratum gap and is pumped to a wellhead by a pumping unit from the bottom of the well, the temperature and the pressure of the surrounding environment can be continuously reduced, along with the reduction of the pressure, some light components in the crude oil can escape in the form of gas, wax crystal molecules can be separated out along with the continuous reduction of the temperature and the pressure of the surrounding environment of the crude oil, the wax precipitation phenomenon of an oil well is caused, the system of the crude oil is unstable, and the wax in the crude oil can be crystallized. These wax crystal molecules are continuously deposited on the wall of the oil pipe and the oil rod, and the wax precipitation of the oil well can be caused. First, wax deposition in an oil well can cause the passage area of oil pipes and transport pipelines in the oil well to be gradually reduced, so that the oil production pipelines are blocked, and the yield of crude oil is reduced or stopped. And the oil pipe blockage can lift the resistance of the sucker rod and even damage the equipment. Thereby increasing the energy consumption of the oil pumping unit and increasing the oil extraction cost. If wax deposits in the oil layer, the crude oil outflow channel can be blocked, and the crude oil yield is reduced. The more serious condition is that the oil rod is blocked, and the oil well stops production.
The wax content of each large oil field in China is very high. According to statistics, the wax content of crude oil produced by most of oil fields reaches about 20 percent, the wax content of crude oil of some oil fields is even as high as 40 percent, and the wax content of about 90 percent of crude oil produced in China is over 10 percent. In the process of crude oil extraction, wax precipitation of an oil well brings serious harm to a crude oil extraction and transportation system. Therefore, in order to ensure the normal development and transportation of crude oil, the paraffin removal and prevention of oil wells become very important measures in the process of crude oil extraction. However, the wax inhibitor used at present needs to be constructed independently, so that the period is long, the construction cost is high, and the wax inhibitor becomes a bottleneck for restricting the application of the wax inhibitor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the paraffin inhibitor added during the fracturing construction, and the paraffin inhibitor does not need to be independently constructed and is added during the fracturing construction, so that the generation of wax is fundamentally prevented.
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent:
10 to 20 percent of sodium stearate,
peregal O-2510-20%,
10-15% of fatty alcohol-polyoxyethylene ether sodium sulfate AES,
5 to 10 percent of sodium dodecyl benzene sulfonate ABS,
0.5 to 1 percent of sodium ethylene diamine tetracetate,
1 to 2 percent of rosin powder,
the balance being quartz sand.
Preferably, the quartz sand is sieved by a 70-100 mesh sieve.
The preparation method of the wax inhibitor comprises the following steps:
(1) sequentially adding sodium stearate, peregal O-25, fatty alcohol-polyoxyethylene ether sodium sulfate AES, sodium dodecyl benzene sulfonate ABS, sodium ethylene diamine tetracetate and rosin powder into a reaction device according to a proportion, and heating and stirring at the temperature of 80 ℃ until the sodium stearate, the peregal O-25, the fatty alcohol-polyoxyethylene ether sodium sulfate AES, the sodium dodecyl benzene sulfonate ABS, the sodium ethylene diamine tetracetate and the rosin powder are completely dissolved for later use;
(2) heating the quartz sand to 50 ℃ while stirring, stopping heating, continuing stirring, and slowly adding the product obtained in the step (1) into the quartz sand under the stirring state;
(3) stirring the product obtained in the step (2) to a temperature lower than 30 ℃, and stopping stirring;
(4) sieving with 20-100 mesh sieve.
Preferably, the slowness in step (2) is based on the fact that the product does not cake.
The application of the wax inhibitor comprises the following steps: during the fracturing construction, after the pre-liquid pumping is finished, the wax inhibitor is added according to the sand ratio of less than 15 percent.
Preferably, the application of the wax inhibitor is as follows:
(1) putting the vehicle, connecting pipelines and testing pressure according to the design requirement of pressing crack;
(2) pumping a fracturing pad fluid;
(3) after the front-end liquid pump is finished, pumping sand-carrying liquid, and adding an anti-wax agent;
(4) after the wax inhibitor is added, adding a fracturing propping agent;
(5) and (5) constructing according to normal fracturing until finishing.
The paraffin inhibitor provided by the invention is solid particles, and sodium stearate, fatty alcohol-polyoxyethylene ether sodium sulfate AES and sodium dodecyl benzene sulfonate ABS utilize the inhibition effect of a surfactant on precipitation, aggregation and deposition of wax crystal molecules to achieve the paraffin inhibitor purpose, peregal O-25 increases the strength of the surfactant and controls the release time, sodium ethylene diamine tetracetate can improve the storage stability of the product, rosin can improve the strength of the product after surface solidification, quartz sand ensures the strength and density of the product and completes granulation of the product, and meanwhile, the product is prevented from floating on the surface of a mixing tank of a sand mixing truck during construction.
The invention has the advantages that:
the paraffin inhibitor provided by the invention does not need to be separately constructed, is added during fracturing construction, can penetrate into the far end of the stratum, increases the action range of the paraffin inhibitor in the stratum, has long effective time, and can be slowly released for about 2 years in the stratum at 30 ℃; the wax control is started before the crude oil is not produced, so that the source of the wax production is directly cut off, and the wax production is fundamentally prevented; construction is convenient, and construction cost is saved.
Detailed Description
Example 1
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent: 18% of sodium stearate, 18% of peregal O-2515%, 12% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 10% of sodium dodecyl benzene sulfonate ABS, 1% of sodium ethylene diamine tetracetate, 2% of rosin powder and 42% of quartz sand sieved by a 70-100 mesh sieve;
the preparation method of the wax inhibitor comprises the following steps:
(1) sequentially adding sodium stearate, peregal O-25, fatty alcohol-polyoxyethylene ether sodium sulfate AES, sodium dodecyl benzene sulfonate ABS, sodium ethylene diamine tetracetate and rosin powder into a reaction kettle according to a proportion, and heating and stirring at the temperature of 80 ℃ until the sodium stearate, the peregal O-25, the fatty alcohol-polyoxyethylene ether sodium sulfate AES, the sodium dodecyl benzene sulfonate ABS, the sodium ethylene diamine tetracetate and the rosin powder are completely dissolved for later use;
(2) heating quartz sand to 50 ℃ in a dry powder mixer while stirring, stopping heating, continuing stirring, and slowly adding the product obtained in the step (1) into the dry powder mixer in a stirring state until the product is not agglomerated;
(3) stirring the product obtained in the step (2) to a temperature lower than 30 ℃, and stopping stirring;
(4) sieving with 20-100 mesh sieve.
Example 2
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent: 10% of sodium stearate, 0% of peregal O-2510%, 15% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 10% of sodium dodecyl benzene sulfonate ABS, 1% of sodium ethylene diamine tetracetate, 1% of rosin powder and 53% of quartz sand sieved by a 70-100-mesh sieve;
the preparation method of the wax inhibitor is the same as that of example 1.
Example 3
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent: 20% of sodium stearate, 20% of peregal O-2515%, 15% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 5% of sodium dodecyl benzene sulfonate ABS, 1% of sodium ethylene diamine tetracetate, 2% of rosin powder and 42% of quartz sand sieved by a 70-100-mesh sieve;
the preparation method of the wax inhibitor is the same as that of example 1.
Example 4
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent: 15% of sodium stearate, 5% of peregal O-2515%, 13% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 8% of sodium dodecyl benzene sulfonate ABS, 0.8% of sodium ethylene diamine tetracetate, 1.2% of rosin powder and 47% of quartz sand sieved by a 70-100-mesh sieve;
the preparation method of the wax inhibitor is the same as that of example 1.
Example 5
The paraffin inhibitor added during fracturing construction comprises the following raw materials in percentage by weight according to 100 percent: 15% of sodium stearate, 0% of peregal O-2520%, 10% of fatty alcohol-polyoxyethylene ether sodium sulfate AES, 8% of sodium dodecyl benzene sulfonate ABS, 0.5% of sodium ethylene diamine tetracetate, 1.5% of rosin powder and 45% of quartz sand sieved by a 70-100 mesh sieve;
the preparation method of the wax inhibitor is the same as that of example 1.
Example 6
The paraffin inhibitor provided by the embodiment 5 is used for prolonging the service life of a certain oil production plant in an oil field, and the fracturing and paraffin inhibition integrated operation construction is carried out;
the length of a G-5 well of an oil production plant of an oil field is prolonged by 6 layers, the oil interval is 854.2-857.5m, the permeability is 1.3mD, the porosity is 10.5%, the oil saturation is 38.6%, and the perforation section is 854.0-856.0m (2.0 m), natural productivity is not generated after perforation, and because the wax precipitation of the area is serious, the serious wax precipitation can occur 60 days after new wells are generally put into production;
the concrete application is as follows:
(1) putting the vehicle, connecting pipelines and testing pressure according to the design requirement of pressing crack;
(2) pumping a fracturing pad fluid;
(3) after the front-end liquid is pumped, pumping sand-carrying liquid, and adding a paraffin inhibitor (the sand ratio of the paraffin inhibitor is 10%);
(4) after the wax inhibitor is added, adding a fracturing propping agent;
(5) constructing according to normal fracturing until finishing;
discharge capacity of 2.5m3Min, adding wax-proofing agent 0.5 m3Adding quartz sand 35m3And performing fracturing construction, wherein the pumping procedure of the fracturing construction is shown in a table 1.
TABLE 1G-5 well fracturing paraffin control integrated operation construction pump injection procedure
Oil appeared after 2 days after pressing, and the initial liquid yield is 5.7m3And d, oil production is 2.6 t/d, no wax precipitation is found 300 days after pressing, and the transformation effect is obvious.
Example 7
The paraffin inhibitor provided by the embodiment 1 is used for prolonging the service life of a certain oil production plant in an oil field, and fracturing and paraffin inhibition integrated operation construction is carried out;
the length of a T-508 well of an oil production plant of an oil field is prolonged by 6 layers, the oil interval is 621.5-627.3m, the permeability is 1.2mD, the porosity is 9.8%, the oil saturation is 42.3%, and the perforation section is 621.0-624.0m (3.0 m is shot), because the wax precipitation of the area is serious, the serious wax precipitation can occur in 30 days after a new well is generally put into operation, and meanwhile, the physical property of the reservoir of the well is poor;
the concrete application is as follows:
(1) putting the vehicle, connecting pipelines and testing pressure according to the design requirement of pressing crack;
(2) pumping a fracturing pad fluid;
(3) after the front-end liquid is pumped, pumping sand-carrying liquid, and adding a paraffin inhibitor (the sand ratio of the paraffin inhibitor is 10%);
(4) after the wax inhibitor is added, adding a fracturing propping agent;
(5) constructing according to normal fracturing until finishing;
discharge capacity of 6m3Min, adding wax-proofing agent 0.8 m3Adding 50m of quartz sand3And performing fracturing construction, wherein the pumping procedure of the fracturing construction is shown in a table 2.
TABLE 2T-508 well volume fracturing paraffin control integrated operation construction pump injection procedure
Oil appeared 7 days after pressing, and the initial liquid yield is 4.9m3And d, oil production is 3.2 t/d, no wax precipitation is found after 280 days of pressing, and the improvement effect is obvious.
Claims (6)
1. The paraffin inhibitor added during fracturing construction is characterized in that: the composite material is composed of the following raw materials in percentage by weight according to 100 percent:
10 to 20 percent of sodium stearate,
peregal O-2510-20%,
10-15% of fatty alcohol-polyoxyethylene ether sodium sulfate AES,
5 to 10 percent of sodium dodecyl benzene sulfonate ABS,
0.5 to 1 percent of sodium ethylene diamine tetracetate,
1 to 2 percent of rosin powder,
the balance being quartz sand.
2. The wax inhibitor according to claim 1, wherein: and sieving the quartz sand by a sieve of 70-100 meshes.
3. A process for producing the wax inhibitor according to claim 1 or 2, wherein: the method comprises the following steps:
(1) sequentially adding sodium stearate, peregal O-25, fatty alcohol-polyoxyethylene ether sodium sulfate AES, sodium dodecyl benzene sulfonate ABS, sodium ethylene diamine tetracetate and rosin powder into a reaction device according to a proportion, and heating and stirring at the temperature of 80 ℃ until the sodium stearate, the peregal O-25, the fatty alcohol-polyoxyethylene ether sodium sulfate AES, the sodium dodecyl benzene sulfonate ABS, the sodium ethylene diamine tetracetate and the rosin powder are completely dissolved for later use;
(2) heating the quartz sand to 50 ℃ while stirring, stopping heating, continuing stirring, and slowly adding the product obtained in the step (1) into the quartz sand under the stirring state;
(3) stirring the product obtained in the step (2) to a temperature lower than 30 ℃, and stopping stirring;
(4) sieving with 20-100 mesh sieve.
4. The method according to claim 3, wherein: the slow speed in the step (2) is subject to the condition that the product does not cake.
5. The application of the wax inhibitor is characterized in that: the application is as follows: in the fracturing construction, after the front liquid pump injection is finished, adding a paraffin inhibitor with a sand ratio of less than 15%, wherein the paraffin inhibitor is the paraffin inhibitor according to claim 1 or 2.
6. Use of an anti-wax agent according to claim 5, wherein: the application specifically comprises the following steps:
(1) putting the vehicle, connecting pipelines and testing pressure according to the design requirement of pressing crack;
(2) pumping a fracturing pad fluid;
(3) after the front-end liquid pump is finished, pumping sand-carrying liquid, and adding an anti-wax agent;
(4) after the wax inhibitor is added, adding a fracturing propping agent;
(5) and (5) constructing according to normal fracturing until finishing.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109762545B (en) * | 2019-02-27 | 2021-03-02 | 中国石油天然气股份有限公司长庆油田分公司第十二采油厂 | Oil well shaft deep-acting wax removing and preventing agent and preparation method thereof |
| CN110079292A (en) * | 2019-03-22 | 2019-08-02 | 中国石油化工股份有限公司 | High-content wax oil reservoir fracturing composition, high-content wax oil reservoir fracturing fluid and high-content wax oil reservoir composite fracturing fluid |
| CN110511732B (en) * | 2019-09-16 | 2022-03-01 | 西南石油大学 | Inhibitor capable of preventing wax from penetrating deep into stratum and preparation method and application thereof |
| CN110982510B (en) * | 2019-11-22 | 2022-08-05 | 中国石油天然气股份有限公司 | Hydraulic fracturing propping agent and preparation method and application thereof |
| CN113550714B (en) * | 2020-04-26 | 2023-07-25 | 中国石油天然气股份有限公司 | Hydraulic fracturing wax control method |
| CN111963130A (en) * | 2020-09-01 | 2020-11-20 | 中国石油天然气股份有限公司 | Fracturing method capable of maintaining flow conductivity of cracks for long time and application thereof |
| CN113278457B (en) * | 2021-06-28 | 2022-01-14 | 湖北亮绿环保技术有限公司 | Wax remover for rapid treatment of oil and gas fields and preparation method thereof |
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