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Crude oil displacement method

A technology for displacement and crude oil, which is applied in chemical instruments and methods, earth-moving drilling, and fluid production, etc., can solve the problems of easy flocculation of calcium and magnesium ions to separate water phase, decrease of polymer viscosity, easy hydrolysis of oil-displacing agents, etc. Achieve the effect of reducing fingering, preventing viscosity drop, and reducing pollution

Active Publication Date: 2019-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems in the prior art that the oil displacing agent is easily hydrolyzed at high temperature, and the viscosity of the polymer drops significantly; the shear is easy to break, and the viscosity drops; it is easy to flocculate and come out of the water phase when encountering calcium and magnesium ions, and the viscosity fails. , to provide a crude oil displacement method that can realize high-efficiency oil displacement under high temperature, high shear and high salinity

Method used

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Examples

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preparation example Construction

[0034] The preparation method of the heavy oil displacement agent that adopts in the embodiment is:

[0035] In a 1000mL three-neck round bottom flask equipped with a stirrer, thermometer and nitrogen circulation, add 400g of Milli-Q ultrapure water, add 64g of AA, 8g of SSS and 8g of DOPAMA under stirring, and heat to 80°C in a water bath. Nitrogen was passed through for 30 minutes, and after the oxygen was completely removed, 0.40g TEMED and 0.40g AIBN were sequentially added. Under nitrogen gas, stir the reaction until the liquid phase in the bottle becomes viscous and the magnetic particles cannot rotate, then stop the ventilation and stirring, and make the reaction in the bottle in a gel state for 4 hours. Afterwards, the resulting gel was cut into small pieces, heated and dried in an oven at 80° C. for 6 hours, and then ground and granulated, with a yield of 98.8%.

[0036] The heavy oil displacement agent that above-mentioned method obtains is carried out rational perf...

Embodiment 1

[0043] The heavy oil displacement agent obtained by the above method is used to displace crude oil, and the experimental steps include:

[0044] 1) Core drying, measurement of size and quality, see Table 2;

[0045] 2) The core is evacuated (vacuum degree-0.1MPa) for 2 hours, saturated with simulated water, and the volume of saturated water is measured, which is used as the core pore volume, see Table 2;

[0046] Table 2 Core parameters

[0047]

[0048] 3) The viscosity of crude oil measured by Brookfield DVIII viscometer is 1468mPa·s (50°C). For saturated oil, inject heavy oil into the core at a rate of about 0.3mL / min at 90°C, and measure the volume of water driven out of the core outlet. For above 1.5PV, the volume of water driven out is the volume of saturated oil. Aging in an oven at 70°C for more than 12 hours.

[0049] 4) Water flooding at a constant temperature of 70°C at a rate of 0.3mL / min, record the pressure during the displacement process and the volume of ...

Embodiment 2-6

[0052] Using the method described in Example 1, using the same type of rock core, in step 4), inject the configured heavy oil displacement agent solution (0.1-0.3%) into the rock core at an injection rate of 0.3-1.0mL / min, inject The water displacement is 1PV, the displacement temperature is 70-120°C, and the oil displacement experiment ends when the water content reaches above 98%. Record the amount of oil and water produced, and calculate the ultimate recovery, as shown in Table 3.

[0053] table 3

[0054]

[0055] Wherein, the highest recovery rate of embodiment 5 is 42.6%. It can be seen from this that the best displacement scheme for crude oil with a viscosity below 1500mPa·s (50°C) at low salinity is as follows: the concentration of ternary polymer is 0.2%, the injection rate is 0.3mL / min, and the displacement temperature is 70°C. As can be seen from Examples 5 and 6, Ca 2+ The recovery rate under high concentration is 40.6%, which has little effect on oil displac...

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Abstract

The invention discloses a crude oil displacement method. The displacement method includes injecting a ternary random copolymer thickened-oil displacing agent into crude oil. The thickened-oil displacing agent comprises structural units represented by formula I, formula II and formula III. The crude oil displacement method has the advantages that under the conditions of low-concentration calcium and magnesium ions, the final recovery rate of displacement of the crude oil with the viscosity smaller than or equal to 1500mPa s (50 DEG C) is 42.6%, 20.5% higher than water displacing; under the conditions of high-concentration calcium and magnesium ions, the final recovery rate of displacement of the crude oil with the viscosity smaller than or equal to 1500mPa s (50 DEG C) is 35.6%, 13.5% higher than water displacing.

Description

technical field [0001] The invention belongs to the field of oil reservoir development, and more specifically relates to a crude oil displacement method. Background technique [0002] my country's oilfield exploitation process is divided into several times, and with the increase of exploitation times, the recovery rate decreases day by day. The current major oil fields have all entered the late stage of exploitation. Therefore, in order to improve the recovery rate of existing oil fields, oil recovery technology has attracted more and more attention. Among them, the research and development of oil displacement agents used in the production process has also increasingly attracted major oil companies and researchers. s concern. [0003] Chinese patent application CN 201010561413.9 discloses a heavy oil cold recovery oil displacement agent for heavy oil recovery and its production process. The heavy oil cold recovery oil displacement agent is composed of the following raw mate...

Claims

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Application Information

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IPC IPC(8): C09K8/588E21B43/22C08F220/06C08F212/14C08F220/58
CPCC08F220/06C09K8/588E21B43/16C08F212/14C08F220/58
Inventor 路熙陈瞰瞰王连生张祖国
Owner CHINA PETROLEUM & CHEM CORP
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