A kind of anticorrosive sucker rod and tubing containing POK polyketide material

Abstract

The present application belongs to the technical field of petroleum equipment, and particularly relates to a kind of anticorrosion sucker rod and oil pipe containing POK polyketone material.The purpose is to solve the problem of low wear resistance, tensile strength and frictional resistance of the existing anticorrosion sucker rod and oil pipe.The anticorrosion sucker rod and oil pipe of the present application is sprayed with POK polyketone material on the surface, wherein the composition and mass components of the POK polyketone material are as follows: POK 50-60 parts by mass;reinforcing agent 20-30 parts by mass;nanometer silicon dioxide 10-15 parts by mass;barium sulfate 5-10 parts by mass;antioxidant 1010 0.2-1 parts by mass.The sucker rod and oil pipe of the present application have the advantages of high tensile strength, low frictional resistance and high wear resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of petroleum equipment, and particularly relates to a corrosion-resistant sucker rod and oil pipe containing a POK polyketone material. BACKGROUND

[0002] In the process of oil exploitation, with the increasing proportion of directional wells, horizontal wells and high-inclination wells, and the continuous deepening of water injection development, the working environment of the pipe rod becomes increasingly harsh. The well fluid salinity is continuously increasing, and the corrosive media (such as H2S, CO2, Cl⁻, brine, etc.) are increasing, and the sucker rod and the oil pipe are in a high-temperature, high-pressure and high-corrosive media environment, and long-term use can easily lead to corrosion, eccentric wear and breakage. Not only does it reduce the strength of the sucker rod, but also causes the sucker rod to break, and it can also wear through the pipe wall, causing the oil pipe to leak, resulting in a shortened equipment life, a surge in maintenance costs, and an impact on normal production of oil wells.

[0003] It is increasingly important to wear-resistant and corrosion-resistant treatment of the sucker rod and the oil pipe.

[0004] Using a chemical corrosion inhibitor is a common anticorrosion method, and the inhibitor is added at the wellhead to form a dense protective film on the sucker rod and the oil pipe to delay corrosion, but this method has limited effect and can only delay corrosion, not fundamentally eliminate it.

[0005] In recent years, spraying a corrosion-resistant material on the surface of the sucker rod and the oil pipe has become the mainstream process for eliminating corrosion, and the technical core of the process is the selection and optimization of the corrosion-resistant material.

[0006] Polyethylene (PE) / polypropylene (PP) composite coating has good damage resistance, impact resistance and waterproofness, but the material has poor adhesion to the metal surface and is prone to falling off.

[0007] Polytetrafluoroethylene (PTFE) has excellent corrosion resistance and friction resistance, but has low mechanical strength and cannot withstand high downhole pressure loads.

[0008] Modified nylon has low cost, but poor high-temperature resistance and is prone to softening and deformation in high-temperature oil wells.

[0009] Epoxy powder has insufficient flexibility, high brittleness and limited impact resistance, and is prone to peeling under impact load.

[0010] Polyketone (POK) material as a kind of engineering plastics with excellent comprehensive performance brings new opportunities to solve the above problems. POK is polymerized by CO, ethylene and propylene, and has many excellent properties. The application of POK polyketone material in the research and development of anticorrosion sucker rod and oil pipe is expected to overcome the shortcomings of the prior art, fundamentally solve the corrosion and eccentric wear problems of the sucker rod and the oil pipe in the complex oil well environment, improve the service life, reduce the oil production cost, and has important practical significance and broad application prospect. At present, POK material is reasonably and efficiently applied in the anticorrosion manufacturing of sucker rod and oil pipe, but the wear resistance, tensile strength and friction resistance need to be further improved. SUMMARY

[0011] The present application provides a kind of POK polyketone material containing anticorrosion sucker rod and oil pipe for the shortcomings of prior art.The sucker rod and the oil pipe of the present application have the advantages of high tensile strength, small friction resistance and high wear resistance.

[0012] The present application discloses a kind of POK polyketone material containing anticorrosion sucker rod and oil pipe, the surface of the anticorrosion sucker rod and oil pipe is sprayed with POK polyketone material containing, wherein the POK polyketone material composition and mass component are as follows:

[0013] POK 50-60 parts by mass;

[0014] Reinforcing agent 20-30 parts by mass;

[0015] Nano-silica 10-15 parts by mass;

[0016] Barium sulfate 5-10 parts by mass;

[0017] Antioxidant 1010 0.2-1 parts by mass.

[0018] The molecular structure of the reinforcing agent is as follows:

[0019]

[0020] Wherein, m is an integer of 500-5000;

[0021] n is an integer of 300-3000.

[0022] Preferably, the reinforcing agent has a viscosity average molecular weight of 500000-1000000.

[0023] The specific steps of the preparation method of the POK polyketone material are as follows:

[0024] (1) The reinforcing agent monomer, OP-10, K12, sodium dihydrogen phosphate and deionized water are sequentially added to the reactor, the reactor and pipeline are purged with nitrogen for 5-10 min, stirring is carried out, and the pH is adjusted to 7-8 with sodium hydroxide solution.

[0025] (2) quickly stir the mixed solution, add initiator, heat to 60-70℃, keep warm for 2-8h to obtain a viscous mixed solution, cool to below 50℃, add ethanol, separate, settle, filter, wash the filtered solid with ethanol for 2-3 times, dry and granulate to obtain the reinforcing agent;

[0026] (3) uniformly mix POK, the reinforcing agent, nano-silicon dioxide, barium sulfate and antioxidant 1010 in proportion, melt at 260-280℃, and granulate to obtain the product containing POK polyketone material.

[0027] Preferably, the reinforcing agent monomer is a mixture of 2-allyl cyclohexanone and allyl pentafluorobenzene, and the mass ratio of the two is (2-8):(8-2).

[0028] Preferably, in step (1), the mass ratio of OP-10, K12, sodium dihydrogen phosphate, deionized water and the reinforcing agent monomer is 0.01-0.02:0.005-0.01:0.005-0.01:3-5:1.

[0029] Preferably, in step (2), the initiator is one of potassium persulfate, ammonium persulfate and sodium persulfate, and the mass ratio of the initiator and the reinforcing agent monomer is 0.01-0.03:1.

[0030] Preferably, the mass ratio of POK, the reinforcing agent, nano-silicon dioxide, barium sulfate and antioxidant 1010 is 50-60:20-30:10-15:5-10:0.2-1.

[0031] The POK polyketone material used in the present application is sprayed on the sucker rod and oil pipe substrate according to a certain process flow, and the specific steps of the process flow are as follows:

[0032]

[0033] (1) Pretreatment

[0034] The surface of the sucker rod and the surface of the oil pipe are cleaned with an alkaline aqueous solution to remove oil stains, and are cleaned with an acidic aqueous solution to remove rust, and the cleaned surfaces are subjected to sand blasting treatment, and are cleaned again with acetone after sand blasting;

[0035] (2) Corrosion prevention treatment of the sucker rod

[0036] The sucker rod is passed through an extruder, and the above-mentioned POK polyketone material is melted and extruded to coat the entire surface of the above-mentioned sucker rod;

[0037] Preferably, the coating thickness of the POK polyketone material is 1000-2500μm; more preferably, the coating thickness of the POK polyketone material is 1500-2000μm.​

[0038] (3) Oil pipe anticorrosion treatment

[0039] The POK-containing polyketone material is sprayed on the oil pipe by electrostatic spraying process.

[0040] Preferably, the spraying thickness of the POK-containing polyketone material is 200-1000 μm; more preferably, the spraying thickness of the POK-containing polyketone material is 300-500 μm.

[0041] In the POK-containing polyketone material sprayed on the surface of the anticorrosion sucker rod and oil pipe, the POK-containing polyketone material is selected from Hanxiang 730R, which has good high-temperature resistance, corrosion resistance and wax prevention effect. The reinforcing agent contains rigid rings, which can greatly increase the strength of the material; has large molecular weight, which can increase the toughness; contains fluorobenzene, which has extremely stable chemical properties and can greatly reduce the friction coefficient and has excellent wear resistance; contains polyketone functional groups, which can be well combined with the POK-containing polyketone material. Nano-silicon dioxide can improve the impact resistance. Barium sulfate can increase the thickness and hiding power of the coating and improve the flatness of the coating. Antioxidant 1010 can prevent oxidation.

[0042] Compared with the prior art, the present application has the following beneficial effects and advantages:

[0043] (1) The anticorrosion sucker rod and oil pipe have high tensile yield stress, and the tensile yield stress reaches 60 MPa or above;

[0044] (2) The anticorrosion sucker rod and oil pipe have low friction coefficient, and the static friction coefficient reaches 0.1 or below, and the dynamic friction coefficient reaches 0.09 or below;

[0045] (3) The anticorrosion sucker rod and oil pipe have low sliding mass wear, and the mass wear reaches 0.0012 g or below. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings illustrate the present application. Figure 1 The reaction equation for synthesizing the reinforcing agent in the POK-containing polyketone material sprayed on the surface of the anticorrosion sucker rod and oil pipe. DETAILED DESCRIPTION

[0047] The technical solutions of the present application will be further described below in combination with specific examples:

[0048] Example 1

[0049] (1) 80 g of 2-allylcyclohexanone, 20 g of allyl pentafluorobenzene, 1 g of OP-10, 0.5 g of K12, 0.5 g of sodium dihydrogen phosphate, 300 g of deionized water were sequentially added into a reactor, the reactor and pipelines were purged with nitrogen for 5 min, stirring, and the pH was adjusted to 7-8 with sodium hydroxide solution;

[0050] (2) The mixed solution was rapidly stirred, 1 g of potassium persulfate was added, the temperature was raised to 70°C, and the reaction was kept for 2 h to obtain a viscous mixed solution, the temperature was lowered to below 50°C, ethanol was added, the layers were separated, settled, filtered, and washed with ethanol for 2 times, the filtered solid was dried and granulated to obtain the enhancer J1.

[0051] (3) 60 g of POK, 20 g of J1, 10 g of nano-silicon dioxide, 9.8 g of barium sulfate, and 0.2 g of antioxidant were uniformly mixed, melted at 260°C, and granulated to obtain a POK-containing polyketone material.

[0052] Example 2

[0053] (1) 70 g of 2-allylcyclohexanone, 30 g of allyl pentafluorobenzene, 1 g of OP-10, 0.5 g of K12, 0.6 g of sodium dihydrogen phosphate, and 350 g of deionized water were sequentially added into a reactor, the reactor and pipelines were purged with nitrogen for 6 min, stirring, and the pH was adjusted to 7-8 with sodium hydroxide solution;

[0054] (2) The mixed solution was rapidly stirred, 1.5 g of potassium persulfate was added, the temperature was raised to 68°C, and the reaction was kept for 2 h to obtain a viscous mixed solution, the temperature was lowered to below 50°C, ethanol was added, the layers were separated, settled, filtered, and washed with ethanol for 2 times, the filtered solid was dried and granulated to obtain the enhancer J2.

[0055] (3) 60 g of POK, 23 g of J2, 10.6 g of nano-silicon dioxide, 6 g of barium sulfate, and 0.4 g of antioxidant were uniformly mixed, melted at 260°C, and granulated to obtain a POK-containing polyketone material.

[0056] Example 3

[0057] (1) 60 g of 2-allylcyclohexanone, 40 g of allyl pentafluorobenzene, 1.5 g of OP-10, 0.8 g of K12, 0.8 g of sodium dihydrogen phosphate, and 500 g of deionized water were sequentially added into a reactor, the reactor and pipelines were purged with nitrogen for 10 min, stirring, and the pH was adjusted to 7-8 with sodium hydroxide solution;

[0058] (2) The mixed solution was rapidly stirred, 2 g of potassium persulfate was added, the temperature was raised to 68°C, and the reaction was kept for 2 h to obtain a viscous mixed solution, the temperature was lowered to below 50°C, ethanol was added, the layers were separated, settled, filtered, and washed with ethanol for 3 times, the filtered solid was dried and granulated to obtain the enhancer J3.

[0059] (3) 56 g POK, 23 g J3, 15 g nano-silica, 5 g barium sulfate, 1 g antioxidant are mixed uniformly, melted at 260°C, granulated to obtain a POK-containing polyketone material.

[0060] Example 4

[0061] (1) A reactor is sequentially charged with 50 g of 2-allylcyclohexanone, 50 g of allyl pentafluorobenzene, 1.5 g of OP-10, 0.7 g of K12, 0.8 g of sodium dihydrogen phosphate, and 323 g of deionized water. The reactor and pipelines are purged with nitrogen for 8 min, stirred, and the pH is adjusted to 7-8 with a sodium hydroxide solution;

[0062] (2) The mixed solution is rapidly stirred, 1 g of sodium persulfate is added, the temperature is raised to 65°C, and the reaction is kept for 4 h to obtain a viscous mixed solution. The temperature is lowered to below 50°C, ethanol is added, the layers are separated, the sediment is settled, filtered, and washed with ethanol for 3 times. The filtered solid is dried and granulated to obtain the reinforcing agent J4.

[0063] (3) 56 g POK, 25 g J4, 11.5 g nano-silica, 7 g barium sulfate, and 0.5 g antioxidant are mixed uniformly, melted at 270°C, and granulated to obtain a POK-containing polyketone material.

[0064] Example 5

[0065] (1) A reactor is sequentially charged with 40 g of 2-allylcyclohexanone, 60 g of allyl pentafluorobenzene, 2 g of OP-10, 0.8 g of K12, 1 g of sodium dihydrogen phosphate, and 455 g of deionized water. The reactor and pipelines are purged with nitrogen for 7 min, stirred, and the pH is adjusted to 7-8 with a sodium hydroxide solution;

[0066] (2) The mixed solution is rapidly stirred, 1.5 g of sodium persulfate is added, the temperature is raised to 65°C, and the reaction is kept for 6 h to obtain a viscous mixed solution. The temperature is lowered to below 50°C, ethanol is added, the layers are separated, the sediment is settled, filtered, and washed with ethanol for 2 times. The filtered solid is dried and granulated to obtain the reinforcing agent J5.

[0067] (3) 53 g POK, 25 g J5, 11 g nano-silica, 10 g barium sulfate, and 1 g antioxidant are mixed uniformly, melted at 275°C, and granulated to obtain a POK-containing polyketone material.

[0068] Example 6

[0069] (1) A reactor is sequentially charged with 30 g of 2-allylcyclohexanone, 70 g of allyl pentafluorobenzene, 2 g of OP-10, 1 g of K12, 0.6 g of sodium dihydrogen phosphate, and 385 g of deionized water. The reactor and pipelines are purged with nitrogen for 10 min, stirred, and the pH is adjusted to 7-8 with a sodium hydroxide solution;

[0070] (2) Fast stirring the mixed solution, adding 1.2 g of ammonium persulfate, heating to 62℃, and keeping the temperature for 4 h to obtain a viscous mixed solution, cooling to below 50℃, adding ethanol, separating, settling, filtering, washing the filtered solid with ethanol for 3 times, drying and granulating to obtain the reinforcing agent J6.

[0071] (3) Mixing 51 g of POK, 28 g of J6, 12 g of nano-silica, 8.3 g of barium sulfate and 0.7 g of antioxidant uniformly, melting at 280℃, and granulating to obtain a POK-containing polyketone material.

[0072] Example 7

[0073] (1) Adding 20 g of 2-allylcyclohexanone, 80 g of allyl pentafluorobenzene, 2 g of OP-10, 1 g of K12, 0.5 g of sodium dihydrogen phosphate and 400 g of deionized water into a reactor in sequence, purging the reactor and pipeline with nitrogen for 6 min, stirring, and adjusting the pH to 7-8 with a sodium hydroxide solution;

[0074] (2) Fast stirring the mixed solution, adding 1.2 g of ammonium persulfate, heating to 60℃, and keeping the temperature for 8 h to obtain a viscous mixed solution, cooling to below 50℃, adding ethanol, separating, settling, filtering, washing the filtered solid with ethanol for 2 times, drying and granulating to obtain the reinforcing agent J7.

[0075] (3) Mixing 50 g of POK, 30 g of J7, 10 g of nano-silica, 9 g of barium sulfate and 1 g of antioxidant uniformly, melting at 280℃, and granulating to obtain a POK-containing polyketone material.

[0076] Comparative Example 1

[0077] The same as step (3) of Example 6, except that 51 g of POK and 28 g of J5 are replaced by 79 g of POK.

[0078] Test Example 1: Tensile yield stress performance test

[0079] The tensile yield stress of the POK-containing polyketone material (Examples 1-7) of the present application is tested according to GB / T 1040 “Test Method for Tensile Properties of Plastics”. The test results are shown in Table 1.

[0080] As can be seen from Table 1:

[0081] The POK-containing polyketone material (Examples 1-7) of the present application has a relatively high tensile yield stress, the tensile yield stress reaches 60 MPa or above, and the highest reaches 64 MPa; while the tensile yield stress of Comparative Example 1 is 49 MPa, which is significantly lower than that of the present application.

[0082] Test Example 2: Static and dynamic friction coefficient test

[0083] The static and dynamic friction coefficients of the POK-containing polyketone material (Examples 1-7) of the present application were tested according to ASTM D1894 "Standard Test Methods for Static and Kinetic Coeffi cient of Friction of Plastic Film and Sheeting", and the test was performed as follows: the test sample was prepared into a flat plate of 120 mm x 120 mm x 2 mm, and the test was performed using a Universal material testing machine equipped with a friction coefficient test accessory at 23 ± 2°C and 50 ± 5% relative humidity. The static friction coefficient was measured using a 200 g load, and the sample was pulled at a speed of 5 mm / min; the dynamic friction coefficient was measured using a 200 g load, and the sample was pulled at a speed of 100 mm / min. The test results are shown in Table 1.

[0084] As can be seen from Table 1:

[0085] The POK-containing polyketone material (Examples 1-7) of the present application has a low friction coefficient, the static friction coefficient is 0.1 or less, and the minimum is 0.08; the dynamic friction coefficient is 0.09 or less, and the minimum is 0.07; and the comparative example 1 is 0.12, which is significantly higher than the present application.

[0086] Test Example 3: Sliding friction and wear test

[0087] The mass wear of the POK-containing polyketone material (Examples 1-7) of the present application was tested according to GB / T 3960 "Plastics - Determination of the mass loss by sliding friction and wear", and the test parameters were as follows: the test ring was rotated at 200 r / min, the test time was 6 h, and the load was 196 N. The test results are shown in Table 1.

[0088] Table 1: Tensile yield stress, friction coefficient, sliding friction and wear test

[0089] Tensile yield stress, MPa Static coefficient of friction Dynamic coefficient of friction Mass wear, g Example 1 60 0.10 0.09 0.0012 Example 2 62 0.10 0.09 0.0010 Example 3 63 0.09 0.08 0.0009 Example 4 63 0.10 0.09 0.0009 Example 5 64 0.09 0.08 0.0007 Example 6 64 0.09 0.08 0.0008 Example 7 63 0.08 0.07 0.0009 Comparative Example 1 49 0.15 0.12 0.0025

[0090] As can be seen from Table 1:

[0091] The POK-containing polyketone material (Examples 1-7) of the present application has a low sliding mass wear, the mass wear is 0.0012 g or less, and the minimum is 0.0007; and the comparative example 1 is 0.0025, which is significantly higher than the present application.

[0092] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An application of POK polyketone material in corrosion-resistant sucker rods and tubing, characterized in that, The surface of the anti-corrosion sucker rod and tubing is coated with a POK-containing polyketone material, wherein the composition and mass fraction of the POK-containing polyketone material are as follows: POK 50-60 parts by weight; 20-30 parts by weight of reinforcing agent; 10-15 parts by weight of nano-silica; 5-10 parts by weight of barium sulfate; Antioxidant 1010: 0.2-1 parts by weight; The molecular structure of the reinforcing agent is as follows: Where m is an integer between 500 and 5000; n is an integer between 300 and 3000; The viscosity-average molecular weight of the reinforcing agent is 500,000-1,000,000.

2. The application of the POK polyketone material as described in claim 1 in corrosion-resistant sucker rods and tubing, characterized in that, The specific steps of the preparation method of the POK polyketide material are as follows: (1) Add the reinforcing agent monomer, OP-10, K12, sodium dihydrogen phosphate and deionized water to the reactor in sequence. Purge the reactor and pipeline with nitrogen for 5-10 minutes, stir, and adjust the pH to 7-8 with sodium hydroxide solution. (2) Stir the mixture quickly, add the initiator, heat to 60-70℃, keep the temperature for 2-8 hours to obtain a viscous mixture, cool to below 50℃, add ethanol, separate into layers, settle, filter, wash with ethanol 2-3 times, dry the filtered solid and granulate to obtain the reinforcing agent. (3) POK, reinforcing agent, nano silica, barium sulfate and antioxidant 1010 are mixed evenly in proportion, melted at 260-280℃, and granulated to obtain the product POK-containing polyketide material. The reinforcing agent monomer is a mixture of 2-allylcyclohexanone and allyl pentafluorobenzene, with a mass ratio of (2-8):(8-2).

3. The application of the POK polyketone material as described in claim 2 in corrosion-resistant sucker rods and tubing, characterized in that, In step (1), the mass ratio of OP-10, K12, sodium dihydrogen phosphate, deionized water and reinforcing agent monomer is 0.01-0.02:0.005-0.01:0.005-0.01:3-5:

1.

4. The application of the POK polyketone material as described in claim 2 in corrosion-resistant sucker rods and tubing, characterized in that, In step (2), the initiator is one of potassium persulfate, ammonium persulfate, or sodium persulfate, and the mass ratio of the initiator to the reinforcing agent monomer is 0.01-0.03:1.

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