A composition and a paraffin control agent containing the same

Abstract

The present application provides a composition and a wax removal and prevention agent containing the same. The composition comprises biosurfactants and penetrants, and the wax removal and prevention agent comprises organic solvents, light oils, surfactants, the composition, mutual solvents and water. The biosurfactants and the penetrants in the composition are synergistic, which enhances the wax removal and prevention ability of the wax removal and prevention agent. Specifically, the wax removal and prevention agent provided by the present application has good stability, high density, and the wax dissolution rate can reach 0.056 g / min, the wax prevention rate can reach 84%, and at the same time, has high wax removal and prevention performance, can effectively dissolve the wax in the pipeline, and reduce the wax deposition tendency in the pipeline.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil and gas well wax removal, and particularly relates to a composition and a wax removal and prevention agent containing the same. BACKGROUND

[0002] In the process of oil and gas well exploitation, with the continuous reduction of temperature and pressure, the wax, gum and asphaltene components in crude oil gradually precipitate and adhere to the well wall, causing blockage of oil and gas migration channels and reduction of oil and gas well production. In order to ensure the production and production efficiency of oil and gas wells, the wax in the pipeline needs to be cleaned in time. The current wax removal methods mainly include mechanical wax removal, thermal wax removal and chemical agent wax removal. Mechanical wax removal and thermal wax removal can effectively remove the wax deposited on the pipe wall, but the production must be stopped during operation, and the energy consumption is high.

[0003] Chemical wax removal technology can overcome the shortcomings of the above two wax removal technologies and has good wax removal effect, and has very good market application prospect. The wax removal and prevention agents used in chemical wax removal technology include oil-based wax removal agent, water-based wax removal agent and emulsion type wax removal agent. The oil-based wax removal agent has good wax removal effect, but has the disadvantages of small density, flammability and explosiveness. The water-based wax removal agent has relatively high density and is safer, but the wax removal effect is generally poor. The emulsion type wax removal agent combines the advantages of oil-based wax removal agent and water-based wax removal agent, which uses emulsification technology to use organic solvent as the inner phase and aqueous solution as the outer phase, and belongs to oil-in-water emulsion, which not only overcomes the disadvantages of flammability and explosiveness of oil-based wax removal agent and low wax dissolving efficiency of water-based wax removal agent, but also ensures the wax removal effect. However, the emulsion type wax removal agent has high stability requirement, and the product needs to ensure the stability during preparation and storage and also requires rapid demulsification at the temperature in the well. The stability and wax removal and prevention efficiency of emulsion wax removal agent are one of the important research directions of wax removal and prevention agent at present. SUMMARY

[0004] One of the present application provides a composition comprising a biosurfactant and a penetrant.

[0005] According to one specific embodiment of the present application, the mass ratio of the biosurfactant and the penetrant is (3 to 5) :(1 to 2).

[0006] According to one specific embodiment of the present application, the biosurfactant is selected from sophorolipid and / or rhamnolipid;

[0007] and / or

[0008] The penetrant is at least one of JFC, JFC-1, JFC-2 and JFC-E;

[0009] Preferably, the biosurfactant is sophorolipid or rhamnolipid; and / or

[0010] The penetrating agent is selected from one of JFC, JFC-1, JFC-2 and JFC-E.

[0011] The second aspect of the present application provides a wax cleaning and preventing agent, which is an oil-in-water emulsion.

[0012] In the oil-in-water emulsion, the water phase comprises a surfactant, a composition, a mutual solvent and water; and the oil phase comprises an organic solvent and a light oil.

[0013] The composition is the composition described in one of the aspects of the present application.

[0014] According to one specific embodiment of the present application, the wax cleaning and preventing agent comprises 20wt% to 30wt% of the organic solvent, 10wt% to 20wt% of the light oil, 8wt% to 12wt% of the surfactant, 4wt% to 7wt% of the composition, 3wt% to 5wt% of the mutual solvent and the balance of water, based on 100% by mass of the wax cleaning and preventing agent.

[0015] Preferably, the wax cleaning and preventing agent comprises 20wt% to 30wt% of the organic solvent, 10wt% to 20wt% of the light oil, 8wt% to 12wt% of the surfactant, 5wt% to 6.5wt% of the composition, 3wt% to 5wt% of the mutual solvent and the balance of water, based on 100% by mass of the wax cleaning and preventing agent.

[0016] According to one preferred embodiment of the present application, the wax cleaning and preventing agent comprises 60wt% of the water phase and 40wt% of the oil phase, based on 100% by mass of the wax cleaning and preventing agent.

[0017] According to one specific embodiment of the present application, the surfactant is a mixture of dodecyl phenol polyoxyethylene ether and polysorbate-80; and / or

[0018] The mutual solvent is selected from at least one of isopropyl alcohol, n-propanol, ethanol and ethylene glycol monobutyl ether; and / or

[0019] The organic solvent is a mixture of D60 solvent oil, petroleum ether and limonene; and / or

[0020] The light oil is condensate oil.

[0021] According to one specific embodiment of the present application, the mass ratio of the dodecyl phenol polyoxyethylene ether and the polysorbate-80 is (1 to 2):1; and / or

[0022] The organic solvent comprises 2 to 3 parts by volume of D60 solvent oil, 1 to 2 parts by volume of petroleum ether and 1 to 2 parts by volume of limonene; and / or

[0023] The light oil is C5 to C 11condensate.

[0024] The third aspect of the present application provides a method for preparing the wax removal and inhibition agent as described in the second aspect of the present application, comprising the following steps:

[0025] 1) mixing the surfactant, the composition, the mutual solvent and water to obtain the water phase;

[0026] 2) mixing the organic solvent and the light oil to obtain the oil phase;

[0027] 3) adding the oil phase into the water phase to obtain the wax removal and inhibition agent.

[0028] According to a specific embodiment of the present application, the step 3) is performed under stirring;

[0029] Preferably, the stirring is performed at a rotation speed of 800 r / min to 1200 r / min for 20 to 30 min.

[0030] The use of any one of the composition of the first aspect of the present application, the wax removal and inhibition agent of the second aspect of the present application and the wax removal and inhibition agent prepared by the method of the third aspect of the present application in the wax removal of oil and gas wells.

[0031] The beneficial effects of the present application are:

[0032] In view of the low stability and low wax removal and inhibition efficiency of the wax removal and inhibition agent in the prior art, the present application provides a composition and a wax removal and inhibition agent containing the same. The composition comprises a biosurfactant and a penetrating agent, and the wax removal and inhibition agent comprises an organic solvent, a light oil, a surfactant, the composition, a mutual solvent and water. In the composition, the biosurfactant and the penetrating agent synergize with each other to enhance the wax removal and inhibition capacity of the wax removal and inhibition agent. Specifically, the wax removal and inhibition agent provided by the present application has the following advantages: (1) neither of them appears stratification, and they remain stable in the form of oil-in-water emulsion, and have good stability; (2) the densities of both of them are about 0.9 g / cm 3 , and the higher density makes them applicable to the wax removal and inhibition operation of water-containing wells; (3) the wax dissolution rate is 0.046 to 0.056 g / min, and the wax inhibition rate is 77% to 84%, and the wax removal and inhibition agent has good wax removal and inhibition performance, and can effectively dissolve the wax in the pipeline while reducing the wax deposition tendency in the pipeline. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with examples, but the examples of the present application are only exemplary descriptions, and the examples do not constitute a limitation on the present application in any case.

[0034] The condensate used in examples 1 to 8 and comparative examples 1 to 9: the carbon number is C5 to C 11, which is taken from Well X21-1 of PetroChina Southwest Oil and Gas Field Company;

[0035] Sophorolipid used in Examples 1 to 3, Examples 6 to 7 and Comparative Examples 1, 5: purchased from Shandong Yousuo Chemical Technology Co., Ltd.;

[0036] Rhamnolipid used in Examples 4 to 5, Example 8 and Comparative Examples 2, 4: purchased from Shaanxi Yikanglong Biological Technology Co., Ltd.;

[0037] Penetrant JFC, JFC-1, JFC-2, JFC-E, fast penetrant T used in Examples 1 to 8 and Comparative Examples 1 to 3, Comparative Example 5, Comparative Examples 7 to 8: purchased from Haian Petroleum Chemical Plant of Jiangsu Province;

[0038] Other raw materials used in Examples 1 to 8 and Comparative Examples 1 to 9 are all commercially available analytical reagents.

[0039] Example 1

[0040] The composition in this example comprises sophorolipid and penetrant JFC in a mass ratio of 3:2;

[0041] Preparation of the wax removal agent:

[0042] 1) 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 5 g of the composition, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 40 g of water, and stirred well to obtain an aqueous phase;

[0043] 2) D60 solvent oil, petroleum ether and limonene were mixed in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were well stirred to obtain an oil phase;

[0044] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of a rotation speed of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical wax removal agent.

[0045] Example 2

[0046] The composition in this example comprises sophorolipid and penetrant JFC-1 in a mass ratio of 5:1.5;

[0047] Preparation of the wax removal agent:

[0048] 1) 4 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 6.5 g of the composition, 2 g of n-propanol and 2 g of ethylene glycol monobutyl ether were added to 41.5 g of water, and stirred well to obtain an aqueous phase;

[0049] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 2:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were fully stirred to obtain an oil phase;

[0050] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 1100 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0051] Example 3

[0052] The composition in this example comprises sophorolipid and penetrant JFC-2 at a mass ratio of 4:1;

[0053] Preparation of the wax cleaning and preventing agent:

[0054] 1) 6 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 5 g of the composition, 3 g of ethanol and 2 g of n-propanol were added to 40 g of water, and fully stirred to obtain a water phase;

[0055] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 3:2:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were fully stirred to obtain an oil phase;

[0056] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 1200 r / min, and stirred for 20 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0057] Example 4

[0058] The composition in this example comprises rhamnolipid and penetrant JFC-E at a mass ratio of 5:1;

[0059] Preparation of the wax cleaning and preventing agent:

[0060] 1) 5 g of dodecyl phenol polyoxyethylene ether, 5 g of polysorbate-80, 6 g of the composition, 3 g of ethanol and 2 g of n-propanol were added to 39 g of water, and fully stirred to obtain a water phase;

[0061] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 3:1:1 to obtain a mixed solution; 30 g of the mixed solution and 10 g of condensate oil were fully stirred to obtain an oil phase;

[0062] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 800 r / min, and stirred for 20 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0063] Example 5

[0064] The composition in this example comprises sophorolipid and penetrant JFC in a mass ratio of 4:2;

[0065] Preparation of the chemical paraffin remover:

[0066] 1) 6 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 6 g of the composition, 2 g of n-propanol and 2 g of ethylene glycol monobutyl ether were added into 40 g of water, and stirred uniformly to obtain an aqueous phase;

[0067] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly in a volume ratio of 2:2:2 to obtain a mixed solution; 30 g of the mixed solution and 10 g of condensate oil were stirred uniformly to obtain an oil phase;

[0068] 3) The oil phase prepared in step 2) was added into the aqueous phase prepared in step 1) under the condition of a rotation speed of 1000 r / min, and stirred for 30 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0069] Example 6

[0070] The composition in this example comprises sophorolipid and penetrant JFC-E in a mass ratio of 4:1;

[0071] Preparation of the chemical paraffin remover:

[0072] 1) 6 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 6 g of the composition, 1 g of isopropyl alcohol, 1 g of ethanol, 1 g of n-propanol and 1 g of ethylene glycol monobutyl ether were added into 40 g of water, and stirred uniformly to obtain an aqueous phase;

[0073] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly in a volume ratio of 3:1:2 to obtain a mixed solution; 20 g of the mixed solution and 20 g of condensate oil were stirred uniformly to obtain an oil phase;

[0074] 3) The oil phase prepared in step 2) was added into the aqueous phase prepared in step 1) under the condition of a rotation speed of 1100 r / min, and stirred for 30 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0075] Example 7

[0076] The composition in this example comprises sophorolipid and penetrant JFC in a mass ratio of 5:1.5;

[0077] Preparation of the chemical paraffin remover:

[0078] 1) 6 g of dodecyl phenol polyoxyethylene ether, 3 g of polysorbate-80, 6.5 g of the composition and 4 g of ethylene glycol monobutyl ether were added into 40.5 g of water, and stirred uniformly to obtain an aqueous phase;

[0079] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 3:1:2 to obtain a mixed solution; 20 g of the mixed solution and 20 g of condensate oil were fully stirred to obtain an oil phase;

[0080] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 800 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0081] Example 8

[0082] The composition in this example comprises rhamnolipid and penetrant JFC-E at a mass ratio of 3:2;

[0083] The wax cleaning and preventing agent was prepared as follows:

[0084] 1) 6 g of dodecyl phenol polyoxyethylene ether, 5 g of polysorbate-80, 5 g of the composition, 3 g of isopropyl alcohol were added to 41 g of water, and fully stirred to obtain a water phase;

[0085] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 3:1:2 to obtain a mixed solution; 20 g of the mixed solution and 20 g of condensate oil were fully stirred to obtain an oil phase;

[0086] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 800 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0087] Comparative Example 1

[0088] The composition in this example comprises sophorolipid and penetrant JFC at a mass ratio of 3:2;

[0089] The wax cleaning and preventing agent was prepared as follows:

[0090] 1) 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 5 g of the composition, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 20 g of water, and fully stirred to obtain a water phase;

[0091] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly at a volume ratio of 3:1:2 to obtain a mixed solution; 20 g of the mixed solution and 20 g of condensate oil were fully stirred to obtain an oil phase;

[0092] 3) The oil phase prepared in step 2) was added to the water phase prepared in step 1) under the condition of a rotation speed of 800 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical wax cleaning and preventing agent.

[0093] Comparative Example 2

[0094] The composition in the present comparative example comprises rhamnolipid and penetrant JFC in a mass ratio of 3:2;

[0095] Preparation of the chemical paraffin remover:

[0096] 1) 5 g of the composition, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 52 g of water, and stirred well to obtain an aqueous phase;

[0097] 2) D60 solvent oil, petroleum ether and limonene were mixed in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred well to obtain an oil phase;

[0098] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0099] Comparative Example 3

[0100] Preparation of the chemical paraffin remover:

[0101] 1) 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 2 g of penetrant JFC-1, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 43 g of water, and stirred well to obtain an aqueous phase;

[0102] 2) D60 solvent oil, petroleum ether and limonene were mixed in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred well to obtain an oil phase;

[0103] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0104] Comparative Example 4

[0105] Preparation of the chemical paraffin remover:

[0106] 1) 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 3 g of rhamnolipid, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 42 g of water, and stirred well to obtain an aqueous phase;

[0107] 2) D60 solvent oil, petroleum ether and limonene were mixed in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred well to obtain an oil phase;

[0108] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0109] Comparative Example 5

[0110] The composition in the present comparative example comprises sophorolipid and penetrant JFC-E in a mass ratio of 3:2;

[0111] Preparation of the chemical paraffin remover:

[0112] 1) 12 g of dodecyl phenol polyoxyethylene ether, 5 g of the composition were added to 43 g of water, and stirred uniformly to obtain an aqueous phase;

[0113] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred uniformly to obtain an oil phase;

[0114] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0115] Comparative Example 6

[0116] Preparation of the chemical paraffin remover:

[0117] 1) 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 45 g of water, and stirred uniformly to obtain an aqueous phase;

[0118] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred uniformly to obtain an oil phase;

[0119] 3) The oil phase prepared in step 2) was added to the aqueous phase prepared in step 1) under the condition of 1000 r / min, and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin remover.

[0120] Comparative Example 7

[0121] Preparation of the chemical paraffin remover:

[0122] 1) 3 g of alkyl glycoside APG0810, 2 g of fast penetrant T, 8 g of dodecyl phenol polyoxyethylene ether, 4 g of polysorbate-80, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 40 g of water, and stirred uniformly to obtain an aqueous phase;

[0123] 2) D60 solvent oil, petroleum ether and limonene were mixed uniformly in a volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of condensate oil were stirred uniformly to obtain an oil phase;

[0124] 3) Under the condition of 1000 r / min, the oil phase prepared in step 2) was added to the water phase prepared in step 1), and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin cleaning and preventing agent.

[0125] Comparative Example 8

[0126] Preparation of the paraffin cleaning and preventing agent:

[0127] 1) 2 g of the rapid penetrating agent T, 8 g of the dodecyl phenol polyoxyethylene ether, 4 g of the polysorbate-80, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 43 g of water, and stirred uniformly to obtain a water phase;

[0128] 2) The D60 solvent oil, the petroleum ether and the limonene were mixed uniformly according to the volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of the condensate oil were stirred uniformly to obtain an oil phase;

[0129] 3) Under the condition of 1000 r / min, the oil phase prepared in step 2) was added to the water phase prepared in step 1), and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin cleaning and preventing agent.

[0130] Comparative Example 9

[0131] Preparation of the paraffin cleaning and preventing agent:

[0132] 1) 3 g of the alkyl polyglycoside APG0810, 8 g of the dodecyl phenol polyoxyethylene ether, 4 g of the polysorbate-80, 2 g of isopropyl alcohol and 1 g of ethylene glycol monobutyl ether were added to 42 g of water, and stirred uniformly to obtain a water phase;

[0133] 2) The D60 solvent oil, the petroleum ether and the limonene were mixed uniformly according to the volume ratio of 3:1:2 to obtain a mixed solution; 25 g of the mixed solution and 15 g of the condensate oil were stirred uniformly to obtain an oil phase;

[0134] 3) Under the condition of 1000 r / min, the oil phase prepared in step 2) was added to the water phase prepared in step 1), and stirred for 25 min to obtain an oil-in-water emulsion, which was the chemical paraffin cleaning and preventing agent.

[0135] Performance evaluation of the paraffin cleaning and preventing agent

[0136] The stability, the density, the wax dissolving rate and the wax preventing rate of the paraffin cleaning and preventing agents prepared in Examples 1 to 8 and Comparative Examples 1 to 9 were determined, and the performance of the paraffin cleaning and preventing agent was evaluated, and the specific method was as follows:

[0137] i. Stability determination: 100 g of each of the paraffin cleaning and preventing agents prepared in Examples 1 to 8 and Comparative Examples 1 to 9 was placed at room temperature (25℃±2℃) for 4 h, and whether there was a stratification phenomenon was observed and recorded; if there was no stratification phenomenon, the sample state of the paraffin cleaning and preventing agent was recorded as stable;

[0138] ii Density determination: The density of the wax removal and inhibition agent was tested according to the method specified in 4.3.3 of the national standard GB / T 4472-2011 "Determination of density and relative density of chemical products";

[0139] iii Wax dissolution rate determination: The wax dissolution rate of the wax removal and inhibition agent was tested according to the method specified in 5.6 of the standard SY / T 6300-2009 "Technical conditions for wax removal and inhibition for oil production";

[0140] iv Wax inhibition rate determination: The wax inhibition rate of the wax removal and inhibition agent was tested according to the method specified in 5.4 of the standard SY / T 6300-2009 "Technical conditions for wax removal and inhibition for oil production", and the specific results are shown in Table 1.

[0141] Table 1. Performance of the wax removal and inhibition agent

[0142] Paraffin control agent Sample state Density / (g / cm 3 ) Rate of wax dissolution / (g / min) Paraffin control rate / % Example 1 Stable 0.908 0.047 82 Example 2 Stable 0.911 0.048 77 Example 3 Stable 0.908 0.051 80 Example 4 Stable 0.913 0.046 84 Example 5 Stable 0.913 0.048 82 Example 6 Stable 0.906 0.056 82 Example 7 Stable 0.906 0.048 80 Example 8 Stable 0.908 0.051 79 Comparative Example 1 Layered / / / Comparative Example 2 Layered / / / Comparative Example 3 Stable 0.910 0.032 46 Comparative Example 4 Stable 0.911 0.037 35 Comparative Example 5 Layered / / / Comparative Example 6 Layered / / / Comparative Example 7 Stable 0.912 0.021 36 Comparative Example 8 Stable 0.908 0.018 18 Comparative Example 9 Stable 0.91 0.012 13

[0143] As can be seen from Table 1, the wax removal and inhibition agents prepared in Examples 1 to 8: (1) all did not show the phenomenon of stratification, and remained stable in the form of oil-in-water emulsion, with good stability; (2) the density was about 0.9 g / cm 3 3, and the higher density enabled them to be applied to the wax removal and inhibition operation of water-containing wells; (3) the wax dissolution rate was 0.046 to 0.056 g / min, and the wax inhibition rate was 77% to 84%, and they had high wax removal and inhibition performance, and could effectively dissolve the wax in the pipeline while reducing the wax deposition tendency in the pipeline. Compared with Example 1, in Comparative Example 1, the amount of organic solvent and condensate oil was changed, in Comparative Example 2, the surfactant was replaced by water of the same mass, in Comparative Example 5, the two surfactants (i.e., the mixture of dodecylphenol polyoxyethylene ether and polysorbate-80) were changed into one surfactant of dodecylphenol polyoxyethylene ether of the same mass and the mutual solvent was replaced by water of the same mass, and in Comparative Example 6, the composition was replaced by water of the same mass, which showed that the wax removal and inhibition agents prepared in Comparative Examples 1, 2, 5 and 6 could not exist stably in the form of oil-in-water emulsion, and all showed the phenomenon of stratification. Compared with Example 1, in Comparative Example 3, the biosurfactant was replaced by water of the same mass, and the wax removal and inhibition agent was composed of only organic solvent, light oil, surfactant, mutual solvent, penetrant and water, although the density was still about 0.9 g / cm 3 3, which showed a stable state and did not show the phenomenon of stratification, and the wax dissolution rate was 0.032 g / min, but the wax inhibition rate was only 46%, and the wax removal and inhibition ability was poor. Compared with Example 1, in Comparative Example 4, the penetrant was replaced by water of the same mass, and the wax removal and inhibition agent was composed of only organic solvent, light oil, surfactant, biosurfactant, mutual solvent and water, although the density was still about 0.9 g / cm 3The left and right sides also showed stable states, and no delamination occurred, the wax dissolving rate was 0.037 g / min, and the wax-proof rate was only 35%, and the wax cleaning and proofing effect was poor. Compared with Example 1, in Comparative Example 7, the composition components were replaced with equal mass of alkyl glycoside APG0810 and fast penetrating agent T, and other components were unchanged, the test wax dissolving rate was 0.021 g / min, the wax-proof rate was 36%, and the wax cleaning and proofing effect was poor. Compared with Example 1, in Comparative Example 8, the biological surfactant component in the composition was replaced with equal mass of water, and the penetrating agent JFC was replaced with equal mass of fast penetrating agent T, and other components were unchanged, the test wax dissolving rate was 0.018 g / min, the wax-proof rate was 18%, and the wax cleaning and proofing effect was poor. Compared with Example 1, in Comparative Example 9, the biological surfactant in the composition was replaced with equal mass of alkyl glycoside APG0810, and the penetrating agent JFC was replaced with equal mass of water, and other components were unchanged, the test wax dissolving rate was 0.012 g / min, the wax-proof rate was 13%, and the wax cleaning and proofing effect was greatly reduced. By comparing the formulations of Example 1, Comparative Example 3, Comparative Example 4, Comparative Example 7, Comparative Example 8, and Comparative Example 9, and the measured wax dissolving rate and wax-proof rate, it can be seen that in the wax cleaning and proofing agent, the lack of biological surfactant, the lack of penetrating agent, or the replacement of different biological surfactants and penetrating agents will significantly reduce the wax dissolving rate of the wax cleaning and proofing agent and almost lose the wax cleaning and proofing function, which can prove that the biological surfactant and the penetrating agent in the composition provided by the application have synergistic effect in enhancing the wax cleaning and proofing function of the wax cleaning and proofing agent, and the good compatibility between the components in the wax cleaning and proofing agent containing the composition enables the wax cleaning and proofing agent to exist stably in the form of an emulsion, and to achieve a high wax dissolving rate while ensuring a high wax-proof rate, and has a good wax cleaning and proofing effect.

[0144] Although the application has been described with reference to specific embodiments, it is understood by those skilled in the art that various changes can be made without departing from the true spirit and scope of the application. In addition, various changes can be made to the subject matter, spirit and scope of the application to adapt to specific situations, materials, material compositions and methods. All these changes are included in the scope of the claims of the application.

Claims

1. A wax remover, which is an oil-in-water emulsion; In the oil-in-water emulsion, the aqueous phase includes surfactants, a composition, mutual solvents, and water; the oil phase includes organic solvents and light oils. The composition includes a biosurfactant and a penetrant; The mass ratio of the biosurfactant to the penetrant is (3 to 5):(1 to 2); The biosurfactant is selected from sophorolipids and / or rhamnolipids; The penetrant is at least one of JFC, JFC-1, JFC-2 and JFC-E; The wax remover is 100% by weight and comprises 20 wt% to 30 wt% of the organic solvent, 10 wt% to 20 wt% of the light oil, 8 wt% to 12 wt% of the surfactant, 4 wt% to 7 wt% of the composition, 3 wt% to 5 wt% of the intersolvent and the balance being water; The mass of the wax remover is 100%, and the wax remover comprises 60 wt% of the aqueous phase and 40 wt% of the oil phase; The surfactant is a mixture of dodecylphenol polyoxyethylene ether and polysorbate-80; The mutual solvents are selected from at least one of isopropanol, n-propanol, ethanol, and ethylene glycol monobutyl ether; The organic solvent is a mixture of D60 solvent oil, petroleum ether, and limonene; The light oil is condensate oil; The mass ratio of the dodecylphenol polyoxyethylene ether to polysorbate-80 is (1 to 2):1; The organic solvent comprises 2 to 3 parts by volume of D60 solvent oil, 1 to 2 parts by volume of petroleum ether and 1 to 2 parts by volume of limonene; The light oil is C5 to C6. 11 Condensate oil.

2. A method for preparing the wax remover as described in claim 1, comprising the following steps: 1) Mix the surfactant, the composition, the mutual solvent, and water to obtain the aqueous phase; 2) Mix the organic solvent and the light oil to obtain the oil phase; 3) The oil phase is added to the aqueous phase to obtain the wax remover.

3. The method according to claim 2, characterized in that, Step 3) is carried out under stirring conditions.

4. The method according to claim 3, characterized in that, The stirring conditions are to stir at a speed of 800 r / min to 1200 r / min for 20 min to 30 min.

5. The application of the wax-removing and anti-waxing agent according to claim 1 or the wax-removing and anti-waxing agent prepared by any one of claims 2 to 4 in dewaxing of oil and gas wells.