阅读说明：本技术 一种高效钻井液用改性聚酰胺极压润滑剂的制备方法 (Preparation method of modified polyamide extreme pressure lubricant for high-efficiency drilling fluid ) 是由 秦波波 王越支 罗春芝 叶礼圆 周博 赵世贵 苗志鹏 于 2020-07-20 设计创作，主要内容包括：本发明公开了一种高效钻井液用改性聚酰胺极压润滑剂的制备方法,该方法包括如下步骤：将重量份为50-70的脂肪酸加入反应器中；再将重量份为10-20的多乙烯多胺加入反应器中混合搅拌；加入重量份为0.8-1.2的催化剂,在温度为180℃捏合反应；向反应器加入重量份为10-15的酸酐,同时加入重量份为0.5-0.8的对甲苯磺酸催化剂；向反应器中加入重量份为5-10的含磷极压剂,再加入重量份为5-10的含硫极压剂；向反应器中加入重量份为1-2泡沫改性剂；减压抽滤并循环水降低反应器温度至50℃。本发明解决了现场润滑剂的加量大、润滑效果差、不抗温、易起泡的问题。(The invention discloses a preparation method of a modified polyamide extreme pressure lubricant for high-efficiency drilling fluid, which comprises the following steps: adding 50-70 parts by weight of fatty acid into a reactor; then adding 10-20 parts by weight of polyethylene polyamine into the reactor, mixing and stirring; adding 0.8-1.2 parts by weight of catalyst, and kneading at 180 ℃; adding 10-15 parts by weight of acid anhydride and 0.5-0.8 part by weight of p-toluenesulfonic acid catalyst into a reactor; adding 5-10 parts by weight of phosphorus-containing extreme pressure agent into a reactor, and then adding 5-10 parts by weight of sulfur-containing extreme pressure agent; adding 1-2 parts by weight of foam modifier into a reactor; the reactor temperature was reduced to 50 ℃ by suction filtration under reduced pressure and circulating water. The invention solves the problems of large addition of the on-site lubricant, poor lubricating effect, no temperature resistance and easy foaming.)

1. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid is characterized by comprising the following steps:

1) adding 50-70 parts by weight of fatty acid into a reactor;

2) then adding 10-20 parts by weight of polyethylene polyamine into the reactor, mixing and stirring, and heating to 180 ℃;

3) adding 0.8-1.2 parts by weight of catalyst, and kneading at 180 ℃ for 2 hours;

4) adding 10-15 parts by weight of acid anhydride and 0.5-0.8 part by weight of p-toluenesulfonic acid catalyst into a reactor, heating to 210-230 ℃, and reacting for 1.5-2 h;

5) Adding 5-10 parts by weight of phosphorus-containing extreme pressure agent and 5-10 parts by weight of sulfur-containing extreme pressure agent into a reactor, wherein the reaction temperature is 210-230 ℃, the reaction time is 1.5-2.5 h, and the temperature of the reactor is reduced to 150 ℃;

6) adding 1-2 parts by weight of foam modifier into a reactor, and reacting for 1-2 hours at 150 ℃;

7) the reactor temperature was reduced to 50 ℃ by suction filtration under reduced pressure and circulating water.

2. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: and 2, the polyene polyamine is one or more of diethylenetriamine, triethylene tetramine and tetraethylene pentamine.

3. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: the catalyst in the step 3 is one or more of phosphorus oxychloride, zinc chloride and tungsten sulfate.

4. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: and 4, the acid anhydride is one of propionic anhydride and maleic anhydride.

5. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: the reaction temperature in the step 4 is 210-230 ℃, and the reaction time is 1.5-2 h.

6. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: the phosphorus-containing extreme pressure agent in the step 5 is one or more of tributyl phosphate, trioctyl phosphate and tris (chloroethyl) phosphate.

7. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: and 5, the sulfur-containing extreme pressure agent is one or more of thiourea, zinc dodecyl thiophosphate and molybdenum dodecyl thiophosphate.

8. The preparation method of the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid, which is characterized by comprising the following steps of: the foam modifier in the step 6 is one or more of organic silicon and polyether modified silicon.

Technical Field

The invention relates to the technical field of lubricants for drilling fluids, in particular to a preparation method of a modified polyamide extreme pressure lubricant for high-efficiency drilling fluids.

Background

In the process of petroleum drilling, because a drilling tool rotates at a high speed, the drilling tool can generate friction with a well wall and a casing pipe, the frictional resistance is overlarge, the drilling speed can be reduced, and the well wall is easy to form a key groove. To reduce this drag, lubricants are often added in the field to increase the lubricity of the drilling fluid and thereby reduce this frictional resistance. And the lubricants commonly used in the field, such as mineral oil, vegetable oil, polyether, graphite and the like. Mineral oils have good temperature resistance and are not suitable for foaming, but they are added in large amounts and have poor lubricity. Vegetable oil has good lubricating effect relative to mineral oil, is not suitable for foaming at low temperature, but is not temperature resistant, is easy to saponify and foam at high temperature, and has reduced lubricating effect. The addition amount of the polyether is large, and the foaming is easy. Graphite, which is added in a large amount and has poor lubricating effect. In order to solve the problems of large addition amount, poor lubricating effect, no temperature resistance, easy foaming and the like of the field lubricant, the modified polyamide extreme pressure lubricant for the high-efficiency drilling fluid is needed urgently at present.

Disclosure of Invention

In order to overcome the defects of related products in the prior art, the invention provides a preparation method of a modified polyamide extreme pressure lubricant for high-efficiency drilling fluid, and provides a modified polyamide extreme pressure lubricant for high-efficiency drilling fluid, which is low in addition, high-efficiency, high-temperature resistant and non-foaming in the drilling process.

The invention provides a preparation method of a modified polyamide extreme pressure lubricant for high-efficiency drilling fluid, which comprises the following steps:

1) adding 50-70 parts by weight of fatty acid into a reactor;

2) then adding 10-20 parts by weight of polyethylene polyamine into the reactor, mixing and stirring, and heating to 180 ℃;

3) adding 0.8-1.2 parts by weight of catalyst, and kneading at 180 ℃ for 2 hours;

4) adding 10-15 parts by weight of acid anhydride and 0.5-0.8 part by weight of p-toluenesulfonic acid catalyst into a reactor, heating to 210-230 ℃, and reacting for 1.5-2 h;

5) adding 5-10 parts by weight of phosphorus-containing extreme pressure agent and 5-10 parts by weight of sulfur-containing extreme pressure agent into a reactor, wherein the reaction temperature is 210-230 ℃, the reaction time is 1.5-2.5 h, and the temperature of the reactor is reduced to 150 ℃;

6) adding 1-2 parts by weight of foam modifier into a reactor, and reacting for 1-2 hours at 150 ℃;

7) the reactor temperature was reduced to 50 ℃ by suction filtration under reduced pressure and circulating water.

In certain embodiments of the present invention, the polyene polyamine described in step 2 is one or more of diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

In certain embodiments of the present invention, the catalyst in step 3 is one or more of phosphorus oxychloride, zinc chloride and tungsten sulfate.

In certain embodiments of the present invention, the acid anhydride in step 4 is one of propionic anhydride and maleic anhydride.

In certain embodiments of the present invention, the reaction in step 4 is carried out at a temperature of 210 ℃ to 230 ℃ for a reaction time of 1.5 to 2 hours.

In certain embodiments of the present invention, the phosphorus-containing extreme pressure agent of step 5 is one or more of tributyl phosphate, trioctyl phosphate, and tris (chloroethyl) phosphate.

In certain embodiments of the present invention, the sulfur-containing extreme pressure agent of step 5 is one or more of thiourea, zinc dodecyl thiophosphate, and molybdenum dodecyl thiophosphate.

In certain embodiments of the present invention, the foam modifier in step 6 is one or more of silicone and polyether modified silicon.

Compared with the prior art, the invention has the following advantages:

1. the adsorption group of the modified polyamide extreme pressure lubricant prepared by the invention is amide, and the amide group is not easy to decompose at high temperature and can still be adsorbed on the surface of metal at high temperature, so that the modified polyamide extreme pressure lubricant has good lubricity at high temperature. In addition, the product also contains longer hydrophobic carbon chains and introduces a ring structure, thereby further improving the temperature resistance of the product.

2. The structure of the lubricant is a small molecular comb-shaped structure, the structure can be quickly and firmly adsorbed on the surface of metal under the condition of small addition amount, and in addition, phosphorus-containing and sulfur-containing groups are introduced to further enhance the lubricating property, so that the lubricant has good lubricating property under the condition of small addition amount.

3. The lubricant introduces a foam modifier, and the modifier participates in reaction to reduce the HLB value of the lubricant and plays a role in integrally controlling foam, so that the lubricant does not foam at normal temperature and high temperature.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.