阅读说明：本技术 一种绿色环保多功能型油气开发用盐垢抑盐剂及其制备方法 (Green environment-friendly multifunctional salt scale inhibitor for oil and gas development and preparation method thereof ) 是由 刘明亮 王瑞杰 腰世哲 张廷廷 王鹏 熊万里 于 2020-06-03 设计创作，主要内容包括：本发明公开了一种绿色环保多功能型油气开发用盐垢抑盐剂及其制备方法,按质量百分比,分别取一定量的有机无磷可降解螯合剂、无机螯合剂、黏土稳定剂、增注剂,余量为水；将有机无磷可降解螯合剂和无机螯合剂置入反应釜中并加水搅拌后,升温至50～80℃反应；降温至室温,向反应釜中加入增注剂并搅拌均匀；向反应釜中加入黏土稳定剂并搅拌均匀,得绿色环保多功能型油气开发用盐垢抑盐剂；抑盐剂一方面可增加氯化钠、碳酸钙以及硫酸钙等盐溶解度,同时可改变这三类盐垢的结晶形态,形成树枝状或雪花状,降低在结晶表面粘附性,可有效防止油气生产过程中上述盐垢在地层与井筒类的沉积,提高油气井生产效率。(The invention discloses a green environment-friendly multifunctional salt scale inhibitor for oil and gas development and a preparation method thereof, wherein a certain amount of organic phosphorus-free degradable chelating agent, inorganic chelating agent, clay stabilizer, injection agent and the balance of water are respectively taken according to mass percentage; placing an organic phosphorus-free degradable chelating agent and an inorganic chelating agent into a reaction kettle, adding water, stirring, and heating to 50-80 ℃ for reaction; cooling to room temperature, adding the injection increasing agent into the reaction kettle, and uniformly stirring; adding a clay stabilizer into the reaction kettle and uniformly stirring to obtain a green environment-friendly multifunctional salt scale inhibitor for oil and gas development; the salt inhibitor can increase the solubility of salts such as sodium chloride, calcium carbonate, calcium sulfate and the like, can change the crystal forms of the three types of salt scales to form a dendritic shape or a snowflake shape, reduces the adhesion on the crystal surface, can effectively prevent the deposition of the salt scales on stratums and mineshafts in the oil and gas production process, and improves the production efficiency of oil and gas wells.)

1. The green environment-friendly multifunctional salt scale inhibitor for oil and gas development is characterized by comprising 20-40% of organic phosphorus-free degradable chelating agent, 10-25% of inorganic chelating agent, 2-5% of clay stabilizer, 1-2% of injection agent and the balance of water by mass percent.

2. The green environmental protection multifunctional salt scale inhibitor for oil and gas development according to claim 1, wherein the organic phosphorus-free degradable chelating agent comprises one or more of tetrasodium aspartate diacetate, tetrasodium glutamate diacetate, trisodium methyl N, N-dicarboxymethylalanine, and disodium maleate.

3. The green environment-friendly multifunctional salt scale inhibitor for oil and gas development according to claim 1, wherein the inorganic chelating agent comprises one or two of potassium ferrocyanide, potassium ferricyanide and sodium sulfide.

4. The green environmental protection multifunctional salt scale inhibitor for oil and gas development according to claim 1, wherein the clay stabilizer comprises one or more of small cationic amine polymer, potassium chloride and potassium formate.

5. The green environmental protection multifunctional salt scale inhibitor for oil and gas development according to claim 1, wherein the injection-increasing agent comprises one or more of perfluorooctyl polyoxyethylene ether surfactant and OP-10.

6. A preparation method of a green environment-friendly multifunctional salt scale inhibitor for oil and gas development is characterized by comprising the following steps:

step 1: respectively taking 20-40% of organic phosphorus-free degradable chelating agent, 10-25% of inorganic chelating agent, 2-5% of clay stabilizer, 1-2% of injection agent and the balance of water according to mass percentage;

step 2: placing an organic phosphorus-free degradable chelating agent and an inorganic chelating agent into a reaction kettle, adding water, stirring, and heating to 50-80 ℃ for reaction;

and step 3: cooling to room temperature, adding the injection increasing agent into the reaction kettle, and uniformly stirring;

and 4, step 4: and adding a clay stabilizer into the reaction kettle and uniformly stirring to obtain the environment-friendly multifunctional salt scale inhibitor for oil and gas development.

7. The method for preparing the salt scale inhibitor for green, environment-friendly and multifunctional oil and gas development according to claim 6, wherein the reaction time in the step 2 is 1-2 hours.

8. The method for preparing the salt scale inhibitor for green, environment-friendly and multifunctional oil and gas development as claimed in claim 6, wherein the stirring time in the step 3 is 0.5-1 hour.

9. The method for preparing the salt scale inhibitor for green, environment-friendly and multifunctional oil and gas development according to claim 6, wherein the stirring time in the step 4 is 0.5-1 hour.

Technical Field

The invention belongs to the technical field of oil and gas field development, and relates to a green environment-friendly multifunctional salt scale inhibitor for oil and gas development and a preparation method thereof.

Background

In the production process of oil and gas fields, salt is often deposited at the positions of stratums, gravel packing layers, oil casings, oil gas nozzles, gathering and transportation pipelines and the like due to the change of conditions such as pressure, temperature and the like, and the instability of hydrothermal mechanics and chemical incompatibility. The salt deposition of the oil and gas field seriously affects the normal production of the oil and gas field, brings huge economic loss to the production of the development of the oil and gas field, the operation of a gas storage and the like, and seriously hinders the development of the oil and gas field and the operation of the gas storage. Salt scale formed by salt deposition and salt deposition of an oil-gas field is mainly sodium chloride, and a certain amount of calcium carbonate and calcium sulfate are added, the existing oil-gas field is treated by adopting a salt cleaning and hydrating mode, however, the salt cleaning and hydrating is simple and effective, but the salt deposition is not thorough every time, so that the water pumping period is shorter and shorter; the crystalline nuclei are deposited on the tube wall for a long time each time, and the tube has to be examined regularly.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a green environment-friendly multifunctional salt scale inhibitor for oil and gas development, which can inhibit salt deposition in the oil and gas field development process, and a preparation method thereof.

The invention is realized by the following technical scheme:

the green environment-friendly multifunctional salt scale inhibitor for oil and gas development comprises, by mass, 20-40% of an organic phosphorus-free degradable chelating agent, 10-25% of an inorganic chelating agent, 2-5% of a clay stabilizer, 1-2% of an injection agent and the balance of water.

Further, the organic phosphorus-free degradable chelating agent comprises one or more of tetrasodium aspartate diacetate, tetrasodium glutamate diacetate, trisodium methyl N, N-dicarboxymethylalanine salt and disodium maleate.

Further, the inorganic chelating agent comprises one or two of potassium ferrocyanide, potassium ferricyanide and sodium sulfide.

Further, the clay stabilizer comprises one or more of small cationic amine polymer, potassium chloride and potassium formate.

Further, the injection enhancing agent comprises one or more of a perfluorooctyl polyoxyethylene ether surfactant and OP-10.

A preparation method of a green environment-friendly multifunctional salt scale inhibitor for oil and gas development comprises the following steps:

step 1: respectively taking 20-40% of organic phosphorus-free degradable chelating agent, 10-25% of inorganic chelating agent, 2-5% of clay stabilizer, 1-2% of injection agent and the balance of water according to mass percentage;

step 2: placing an organic phosphorus-free degradable chelating agent and an inorganic chelating agent into a reaction kettle, adding water, stirring, and heating to 50-80 ℃ for reaction;

and step 3: cooling to room temperature, adding the injection increasing agent into the reaction kettle, and uniformly stirring;

and 4, step 4: and adding a clay stabilizer into the reaction kettle and uniformly stirring to obtain the environment-friendly multifunctional salt scale inhibitor for oil and gas development.

Further, the reaction time in the step 2 is 1-2 hours.

Further, the stirring time in the step 3 is 0.5-1 hour.

Further, the stirring time in the step 4 is 0.5-1 hour.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the green environment-friendly multifunctional salt scale inhibitor for oil and gas development and the preparation method thereof, the phosphorus-free chelating agent component of the salt inhibitor can improve the solubility of salt scale through the chelating and masking effect on specific metal ions of sodium, calcium and magnesium; meanwhile, the crystal crystallization state of salt scale such as sodium chloride, calcium carbonate, calcium sulfate and the like is changed to form a dendritic or snowflake-shaped amorphous structure, the adhesion force of the salt scale on the solid surface is reduced, the loose structure is beneficial to discharging the salt scale along with formation fluid, the blockage of a shaft and the formation caused by salt in the production process can be effectively prevented, and the production efficiency of the oil-gas well is improved.

Drawings

FIG. 1 is a comparative graph of the evaluation effect of the rock core salt-proofing experiment in example 1 of the present invention;

FIG. 2 is a graph showing the effect of the amount of salt solubilized in example 1 of the present invention in experiments at various temperatures and concentrations.

Detailed Description

Specific examples are given below.