CN115725354A - Fracturing truck plunger packing lubricating grease and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of lubricating grease, and particularly discloses fracturing truck plunger packing lubricating grease and a preparation method thereof. The fracturing truck plunger packing lubricating grease comprises base oil, a thickening agent, an antioxidant, an antirust agent, an antifriction agent and an adhesive; wherein the thickening agent is prepared by taking lithium hydroxide, calcium hydroxide, glutaric acid, adipic acid and 9, 10-dihydroxystearic acid as raw materials. The fracturing truck plunger packing lubricating grease provided by the invention has excellent adhesion, can provide good sealing for the plunger packing, greatly reduces the using amount of the lubricating grease, reduces the equipment abrasion and prolongs the service life of the equipment.

Description

Fracturing truck plunger packing lubricating grease and preparation method thereof

Technical Field

The invention relates to the technical field of lubricating grease, and particularly relates to fracturing truck plunger packing grease and a preparation method thereof.

Background

In the field of oil exploitation, fracturing refers to the process of oil or gas production, and the hydraulic action is utilized to generate cracks in an oil-gas layer, thereby playing an important role in improving the flowing environment of oil and gas underground and increasing the yield of the oil and gas.

The fracturing truck is used for injecting high-pressure and large-discharge fracturing fluid into a well, fracturing the stratum and extruding a propping agent (fracturing fluid) into a crack, and is mainly used for various fracturing operations of oil, gas and water wells. The working principle of the fracturing truck is as follows: a hydraulic pump is driven by the power takeoff of the chassis truck, and the hydraulic pump drives a starting motor of the vehicle platform engine to start the vehicle platform engine; the power generated by the trolley engine drives the fracturing pump to work through the gearbox and the transmission shaft; the fracturing fluid is sucked in by a fracturing pump suction manifold, is discharged by a high-pressure discharge manifold after being pressurized, and is injected into the underground well to implement fracturing operation; the equipment can perform stand-alone and on-line operation.

The fracturing truck is divided into an on-platform device and an under-platform device, and the under-platform device mainly comprises a vehicle-carrying chassis system, an engine system and a transmission system; the bench equipment mainly comprises a bench engine, a bench transmission case, a fracturing pump, a manifold system, a lubricating system, a circuit system, an air path system, a hydraulic system and the like. The main lubricating part of the lubricating system of the fracturing truck is the lubrication of a plunger and a packing, and the conventional truck mostly adopts lubricating oil for lubrication, so that the problems of poor lubricating and sealing effects, large consumption and the like exist. Most of new vehicle types adopt lubricating grease for lubrication, and firstly, the lubricating and sealing effects are good; secondly, the dosage is small, and the use cost is low; thirdly, the adhesive property is strong, the leakage is less, and the influence on the environment is small. Therefore, it is necessary to develop a fracturing truck plunger packing grease and a preparation method thereof.

Disclosure of Invention

In view of the above, the invention provides a fracturing truck plunger packing grease which has excellent adhesion, can provide good sealing for the plunger packing, and greatly reduces the amount of the grease; reduce the equipment wear and prolong the service life of the equipment.

In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:

the lubricating grease for the packing of the fracturing truck plunger comprises the following components in percentage: 76 to 90 percent of base oil, 3 to 8 percent of thickening agent, 0.1 to 0.6 percent of antioxidant, 0.1 to 0.6 percent of antirust agent, 2 to 10 percent of antifriction agent and 1 to 5 percent of adhesive; wherein the thickening agent is prepared by taking lithium hydroxide, calcium hydroxide, glutaric acid, adipic acid and 9, 10-dihydroxystearic acid as raw materials.

Furthermore, the mol ratio of the lithium hydroxide, the calcium hydroxide, the glutaric acid, the adipic acid and the 9, 10-dihydroxystearic acid is (0.8-0.95), (0.025-0.1), (0.02-0.1) and (0.6-0.92).

Preferably, the lithium hydroxide is lithium hydroxide monohydrate.

Preferably, the base oil is a polyalphaolefin and/or a polyester.

Preferably, the type of the poly-alpha olefin is at least one of PAO10, PAO20, PAO40, PAO100, HC1000, HC 2000.

Preferably, the polyester is at least one of the types KL135, KL1300, KL 2700.

Preferably, the antioxidant is at least one of zinc dialkyl dithiophosphate, zinc thiocarbamate, diisooctyl diphenylamine and 2, 6-di-tert-butyl-4-methylphenol.

Preferably, the antirust agent is at least one of benzotriazole derivatives, petroleum sulfonate and zinc naphthenate.

Preferably, the friction reducer is at least one of oleamide, erucamide and ammonium phosphate.

Preferably, the adhesive is at least one of polymeric phosphate, polyacrylamide and polyvinyl n-butyl ether.

The embodiment of the invention also provides a preparation method of the fracturing truck plunger packing lubricating grease, which comprises the following steps:

(1) Preparation of the thickening agent: putting one third of base oil into a reaction kettle, stirring and heating to 95-100 ℃, sequentially adding 9, 10-dihydroxystearic acid, glutaric acid and adipic acid according to the proportion, stirring and dissolving for 30-60min, adding water to pre-dissolve lithium hydroxide and calcium hydroxide solution, heating to 95-110 ℃, reacting for 120-180min, continuing to heat to 120-150 ℃, dehydrating for 60-120min, continuing to heat to 210-230 ℃, and preserving heat for 5-20min; adding one third of base oil, cooling to 140-160 deg.C, adding the rest base oil, cooling to 100-130 deg.C, and homogenizing for 60-120min.

(2) And after homogenization, sequentially adding an antioxidant, an antirust agent, an antifriction agent and an adhesive according to the proportion, and uniformly stirring to obtain the fracturing truck plunger packing grease.

The molar ratio of water to bases is 1.

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

(1) The fracturing truck plunger packing lubricating grease is in a semi-fluid state, uses a novel thickening agent and an adhesive, has excellent adhesion, has the adhesion rate of 98.3 percent at most, is nearly 5 times of a commercially available product, can provide good sealing for the plunger packing, and greatly reduces the using amount of the lubricating grease.

(2) The antifriction agent added into the fracturing truck plunger packing lubricating grease can provide excellent lubrication for the plunger packing, reduce the equipment abrasion and prolong the service life of the equipment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

Example 1

The embodiment of the invention provides a preparation method of fracturing truck plunger packing lubricating grease, which comprises the following steps:

(1) Preparation of the thickening agent: adding 600g of poly alpha olefin (PAO 10) into a reaction kettle, stirring and heating to 98 ℃, then sequentially adding 98.2g of 9, 10-dihydroxystearic acid, 8.2g of glutaric acid and 13.6g of adipic acid according to the above proportion, stirring and dissolving for 40min, adding 28g of water pre-dissolved 22g of lithium hydroxide and 6.1g of calcium hydroxide solution, heating to 100 ℃, reacting for 160min, continuously heating to 130 ℃, dehydrating for 80min, continuously heating to 220 ℃, and keeping the temperature for 15min; adding 600g of poly alpha olefin, quenching, cooling to 150 ℃, adding the rest poly alpha olefin, continuously cooling to 120 ℃, and homogenizing for 80min.

(2) After homogenization is finished, 19.2g of zinc dialkyl dithiophosphate, 3.8g of triazole derivative, 19.2g of oleamide and 57.6 g of polymeric phosphate are sequentially added according to the proportion, and the mixture is uniformly stirred to obtain the fracturing truck plunger packing grease.

Example 2

The embodiment of the invention provides a preparation method of fracturing truck plunger packing lubricating grease, which comprises the following steps:

(1) Preparation of the thickening agent: putting 600g of polyester (KL 135) into a reaction kettle, stirring and heating to 95 ℃, then sequentially adding 98.2g of 9, 10-dihydroxystearic acid, 10.3g of glutaric acid and 11.3g of adipic acid according to the proportion, stirring and dissolving for 30min, adding 24g of lithium hydroxide and 3.1g of calcium hydroxide solution which are pre-dissolved by 28g of water, heating to 95 ℃, reacting for 120min, continuously heating to 120 ℃, dehydrating for 60min, continuously heating to 210 ℃, and preserving heat for 5min; adding 600g polyester, quenching, cooling to 140 deg.C, adding the rest polyester, cooling to 100 deg.C, and homogenizing for 60min.

(2) And after homogenization is finished, adding 22.3g of zinc thiocarbamate, 25.4g of zinc thiocarbamate, 18.3g of zinc thiocarbamate and 68.4g of polyacrylamide according to the proportion in sequence, and uniformly stirring to obtain the fracturing truck plunger root lubricating grease.

Example 3

The embodiment of the invention provides a preparation method of fracturing truck plunger packing lubricating grease, which comprises the following steps:

(1) Preparation of the thickening agent: putting 600g of poly alpha olefin (PAO 20) into a reaction kettle, stirring and heating to 100 ℃, sequentially adding 98.2g of 9, 10-dihydroxystearic acid, 12.3g of glutaric acid and 9.1g of adipic acid according to the proportion, stirring and dissolving for 60min, adding 32g of water pre-dissolved 22.4g of lithium hydroxide and 9.6g of calcium hydroxide solution, heating to 110 ℃, reacting for 180min, continuously heating to 150 ℃, dehydrating for 120min, continuously heating to 230 ℃, and preserving heat for 20min; adding 600g of poly-alpha-olefin, quenching, cooling to 160 ℃, adding the rest poly-alpha-olefin, continuously cooling to 130 ℃, and homogenizing for 120min.

(2) After homogenization is finished, 3.94g of diisooctyldiphenylamine, 4.87g of zinc naphthenate, 22.5g of phosphate ammonium salt and 59.5g of polyvinyl n-butyl ether are added in sequence according to the proportion, and the mixture is uniformly stirred to obtain the fracturing truck plunger packing grease.

Comparative example 1

And (3) adopting commercially available fracturing truck plunger packing lubricating oil.

Example of detection

In order to better illustrate the characteristics of the fracturing truck plunger packing grease provided by the embodiment of the invention, the fracturing truck plunger packing greases of the embodiment and the comparative example are tested, and the results are shown in table 1 below.

Table 1 performance test of fracturing truck plunger packing grease of examples and comparative examples

As can be seen from table 1, the friction reduction, wear resistance and adhesion of the fracturing truck plunger packing grease provided by the present application are greatly improved; the friction coefficient of the four balls reflects the antifriction performance of the lubricating grease, and the smaller the numerical value, the better the numerical value; the four-ball abrasion spot diameter reflects the abrasion resistance of the lubricating grease, and the smaller the numerical value, the better the value; the larger the adhesion, the better.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides a fracturing truck plunger packing grease which characterized in that: the paint comprises the following components in percentage: 76 to 90 percent of base oil, 3 to 8 percent of thickening agent, 0.1 to 0.6 percent of antioxidant, 0.1 to 0.6 percent of antirust agent, 2 to 10 percent of antifriction agent and 1 to 5 percent of adhesive; the thickening agent is prepared from lithium hydroxide, calcium hydroxide, glutaric acid, adipic acid and 9, 10-dihydroxystearic acid.

2. The fracturing truck plunger packing grease of claim 1 wherein the molar ratio of the lithium hydroxide, the calcium hydroxide, the glutaric acid, the adipic acid and the 9, 10-dihydroxystearic acid is (0.8-0.95), (0.025-0.1), (0.02-0.1), (0.6-0.92); the lithium hydroxide is lithium hydroxide monohydrate.

3. The fracturing truck plunger packing grease of claim 1 wherein the base oil is a polyalphaolefin and/or a polyester.

4. The frac truck plunger packing grease of claim 3 wherein said polyalphaolefin is at least one of PAO10, PAO20, PAO40, PAO100, HC1000, HC 2000.

5. The frac car plunger packing grease of claim 3 wherein said polyester is at least one of type KL135, KL1300, KL 2700.

6. The fracturing truck plunger packing grease of claim 1, wherein the antioxidant is at least one of zinc dialkyl dithiophosphate, zinc thiocarbamate, diisooctyl diphenylamine, 2, 6-di-tert-butyl-4-methylphenol.

7. The fracturing truck plunger packing grease of claim 1, wherein the rust inhibitor is at least one of benzotriazole derivatives, petroleum sulfonate and zinc naphthenate.

8. The frac car plunger packing grease of claim 1 wherein said friction reducer is at least one of oleamide, erucamide, ammonium phosphate.

9. The fracturing truck plunger packing grease of claim 1, wherein the adhesive is at least one of a polymeric phosphate ester, polyacrylamide, polyvinyl n-butyl ether.

10. The preparation method of the fracturing unit truck plunger packing grease as set forth in any of claims 1 to 9, characterized by comprising the steps of:

(1) Preparation of a thickening agent: putting one third of base oil into a reaction kettle, stirring and heating to 95-100 ℃, sequentially adding 9, 10-dihydroxystearic acid, glutaric acid and adipic acid according to the proportion, stirring and dissolving for 30-60min, adding water to pre-dissolve lithium hydroxide and calcium hydroxide solution, heating to 95-110 ℃, reacting for 120-180min, continuing to heat to 120-150 ℃, dehydrating for 60-120min, continuing to heat to 210-230 ℃, and preserving heat for 5-20min; adding one third of base oil, cooling to 140-160 deg.C, adding the rest base oil, cooling to 100-130 deg.C, and homogenizing for 60-120min.

(2) And after homogenization, sequentially adding an antioxidant, an antirust agent, an antifriction agent and an adhesive according to the proportion, and uniformly stirring to obtain the fracturing truck plunger packing grease.