CN1472276A - Efficient thickened oil and super-thickened oil viscosity reducer - Google Patents

Abstract

The invention discloses a high-efficiency thick oil and super-thick oil viscosity reducer, belonging to the synthesis of thick oil emulsifying surfactants. The multifunctional surface active viscosity reducer is prepared from sodium dodecyl benzene sulfonate, alkylphenol ethoxylates and other raw materials according to a certain weight ratio, not only replaces the prior thick oil and thin oil mixed shaft electric heating process technology in a chemical viscosity reduction mode, but also can realize shaft viscosity reduction pipeline transportation and united station dehydration integrated engineering, not only can reduce the overhigh electric energy consumption of thick oil and ultra-thick oil, but also can reduce the exploitation cost of mixed thin oil, has good compatibility with a demulsifier used in a united station, has a quick dehydration function, has an ultra-thick oil viscosity reduction rate of more than 99 percent, has a remarkable thick oil viscosity reduction effect, reduces the comprehensive cost by 15-20 yuan/ton, is convenient to construct and easy to prepare, and can be widely popularized in oil field thick oil and ultra-thick oil development areas.

Description

A high-efficiency viscous reducer for heavy oil and ultra-heavy oil

Technical field:

The invention relates to a high-efficiency viscous reducer for heavy oil and super heavy oil, which belongs to heavy oil and super heavy oil, especially the synthesis technology of emulsifying surfactant mixed with active water instead of electric heating and mixed with thin oil to exploit heavy oil and extra heavy oil kind.

Background technique:

The heavy oil and ultra-heavy oil production methods in the oil field have been using the method of mixing thin oil into the oil well for many years, and the electric heating process of the wellbore. There are price differences in thin oil technology and the trend of reducing the amount of thin oil that can be blended; and the electric heating recovery technology of super heavy oil has the problem of high power consumption, which leads to a significant increase in the cost of oil production per ton. Therefore, At present, domestic and foreign are looking for a chemical process technology with low energy consumption and low production cost of tons of oil to replace the existing technology of heavy oil mixed with thin oil and ultra-heavy oil wellbore electric heating process technology. The invention has not been found in domestic and foreign patents. report.

Invention content:

The object of the present invention is to provide a kind of high-efficiency heavy oil super heavy oil viscosity reducer in order to overcome the above-mentioned shortcoming, this viscosity reducer adopts the method of mixing active water and chemical viscosity reduction to replace and change the current crude oil in the exploitation process due to mixing thin oil and The current situation of high energy per ton oil production cost in wellbore electric heating technology has greatly increased. In addition, the present invention can also integrate heavy oil wellbore viscosity reduction, pipeline transportation and combined station dehydration construction to realize the integration of viscosity reduction and dehydration The goal is to further reduce the cost of extracting crude oil. The realization mode of the present invention is:

In order to achieve the above object, the preparation method of the high-efficiency heavy oil super heavy oil viscosity reducer of the present invention is dominated by the chemical agent alkylphenol polyoxyethylene ether, polyoxyethylene polyoxypropylene polyethylene polyamine, and sodium dodecylbenzenesulfonate. agent; long-chain alcohol and penetrating agent as auxiliary agents, water-based viscosity reducer made according to a certain ratio; when the viscosity reducer is prepared, the total active ingredient content is not less than 45-60% by weight.

The preparation method of the high-efficiency heavy oil super heavy oil viscosity reducer of the present invention is characterized in that, under the condition of normal pressure stirring at 50-80 degrees Celsius, firstly, sodium dodecylbenzenesulfonate is prepared into a 10-20% concentration solution, and then slowly add alkylphenol polyoxyethylene ether, polyoxyethylene polyoxypropylene polyethylene polyamine, long-chain alcohol and penetrating agent to the above system in sequence, and the weight ratio of the added raw materials is 10:20:10: 4: 5-20: 10: 3: 1: 2, while stirring at 60-120 rpm for 60-90 minutes, the water-based viscosity reducer can be obtained.

When using the high-efficiency heavy oil super heavy oil viscosity reducer described in the present invention, first add the viscosity reducer in water at 20-50 degrees Celsius, the weight percentage of the prepared viscosity reducer is: 0.1-1% aqueous solution, and then Add this solution to the crude oil at 45-90 degrees Celsius, the ratio of the aqueous solution to the crude oil is 4:6-1:9 mixed liquid, and then stir at 30-120 rpm for 1-3 minutes; Forms a low viscosity water-in-water emulsion. The long-chain alcohol is lauryl alcohol (lauryl alcohol), and the penetrating agent is alkyl alcohol polyoxyethylene ether.

Compared with the prior art, the present invention has remarkable effect.

Since the water-based viscosity reducer in the present invention adopts the main agent and auxiliary agent raw materials and is compounded into an organic synthetic surfactant in a certain proportion, it has a good viscosity reduction effect on heavy oil and super heavy oil, and the viscosity reducer also has automatic Demulsification and dehydration performance, used for viscosity reduction of super heavy oil, its viscosity reduction rate can reach more than 99%. In addition, if it is used in the dehydration process of the well station or the union station, when it is used in the union station or the well station, it can realize automatic demulsification and dehydration. Even without adding any demulsifier, when the crude oil in the tank is at a temperature of 85 degrees Celsius After 72 hours of subsidence, the water content can still be reduced to less than 4%. In addition, the viscosity reducer has a good ratio with the existing demulsifier, which is helpful for rapid dehydration. The cost of the viscosity reducer is low, and after application, it can reduce the cost of produced oil by 15-20 yuan/ton of oil compared with wellbore electric heating.

Description of drawings:

Fig. 1, the downhole part construction flow chart of the present invention

Fig. 2, the schematic diagram of the construction process of the ground part of the present invention

In the figure: 1. Hollow sucker rod, 2. Oil pipe, 3. Casing pipe, 4. Oil well pump, 7. Work cylinder, 8. Agitator, 9. Hollow screw pump, 12. 1# medicine tank, 13, 2 #medicine tank, 14, 3# water tank, 15, 4# oil tank, 16, 5# oil tank, 17, pumping unit, 18, composition of oil layer.

Detailed ways:

The invention is given by the following examples:

The present invention will be further described below in conjunction with accompanying drawing:

Example 1, the method of using the viscosity reducer in the construction of heavy oil and super heavy oil viscosity reducer. First add the viscosity reducer to water at 20-50°C; the weight percentage of the viscosity reducer is an aqueous solution of 0.1-1%, and then stir the heated viscosity reducer from the ventricular sucker rod 1 in the medicine tank Input this aqueous solution into the mandrel 7 and agitator 8 in the downhole mixing device at 45-90°C, so that the crude oil mixed with viscosity reducer can be fully stirred. At this time, the ratio of aqueous solution to crude oil is 4:6-1: 9. Stirring by the stirrer 8 at 30-120 rpm, the crude oil in the oil pipe 2 can form a low-viscosity oil-in-water emulsion after 1-3 minutes. At this time, the oil-in-water emulsion will still be pumped The mixing effect is produced during the lifting process of the oil well, forming a low-viscosity oil-water emulsion, so as to achieve the purpose of reducing the viscosity of the heavy oil in the wellbore tubing 2 and the annular space between the casing 3 and the tubing 2.

Embodiment 2, when Fig. 2 uses the viscosity reducer to carry out the pre-dehydration process of the low-viscosity oil-water emulsion, the low-viscosity oil-water emulsion extracted from the pumping unit 17 enters the 4# oil tank 15 and the 5# oil tank 16 through the pipeline, After automatic settlement at a temperature of 60-65°C for 1-3 hours, 20%-30% of the active water removed by the system flows into the 3# water tank 14 through the pipeline, and settles again for 0.5-2 hours. At this time, give The oil content of the decontaminated sewage is 300-800PPm, and its mechanical impurity content is 5000-8000PPm, which can meet the requirements of back-mixing. Relying on the water level difference, the active water is pressed into the 1# medicine tank 12, so as to realize the integrated function of pipeline circulation transportation and dehydration , saving the cost of oil-water emulsion and water resources.

Example 3, field test data of viscosity reducer: mixed with viscosity reducer active water instead of wellbore electric heating technology viscosity reduction test 9 wells and 7 wells The test parameter results are as follows: as shown in the table:

By adopting the viscosity reduction technology mixed with active water, it can be seen that several main technical parameters (including the temperature and viscosity of the wellhead output fluid of the pumping unit's up and down currents, etc.) have been significantly reduced, thereby greatly reducing the oil viscosity caused by oil viscosity during the production process. The resulting high friction, high load unfavorable factors, and create good conditions for low temperature pipeline transportation.

The automatically detached sewage achieves the purpose of recycling and further reduces the mining cost.

Claims (4)

1. A high-efficiency heavy oil super heavy oil viscosity reducer, characterized in that the chemical solvent alkylphenol polyoxyethylene ether, polyoxyethylene polyoxypropylene polyethylene polyamine, dodecane Sodium phenyl sulfonate as the main agent, long-chain alcohol and penetrating agent as auxiliary agent is a water-based viscosity reducer prepared in a certain ratio. The total content of active ingredients in the water-based viscosity reducer is not less than 45-60% when preparing % by weight. 2. A high-efficiency heavy oil and ultra-heavy oil viscosity reducer according to claim 1, characterized in that the preparation method of the water-based viscosity reducer is to first make dodecylbenzene Sodium sulfonate and water are prepared into a solution with a concentration of 10% to 20%. Slowly add alkylphenol polyoxyethylene ether, polyoxyethylene polyoxypropylene polyethylene polyene polyamine, long-chain alcohol and penetrating agent in sequence according to the above system, The weight ratio of the added raw materials is 10:20:10:4:5-20:10:3:1:2, and at the same time, it is continuously stirred at a speed of 60-120 rpm for 60-90 minutes to obtain the agent. 3. A high-efficiency heavy oil and ultra-heavy oil viscosity reducer according to claim 2, characterized in that the method of using the agent is to add the viscosity reducer to an aqueous solution with a weight percentage of 0.1 to 1% in water at 20 to 50 degrees Celsius, Add it to crude oil at 45-90 degrees, the ratio of aqueous solution to crude oil is 4:6-1:9, and then stir for 1-3 minutes under the condition of 30-120 rpm to form a low-viscosity water-in-water emulsion. 4. A high-efficiency heavy oil super heavy oil viscosity reducer according to claim 1, characterized in that the long-chain alcohol is lauryl alcohol (lauryl alcohol), and the penetrating agent is alkyl alcohol polyoxyethylene ether.