Temperature-resistant and salt-tolerant foaming agent system for thermal recovery of heavy oil reservoir and preparation method

A temperature-resistant, salt-resistant, foaming agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of wasting resources, increasing sweep efficiency, reducing the flow rate of displacement fluid and crude oil, and saving costs Cost, good thermal stability, effect of increased apparent viscosity

Inactive Publication Date: 2017-05-31
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the steam flooding process, due to the low viscosity and strong fluidity of the steam (gas) itself, most of the steam channeled along the large pores, resulting in serious viscous fingering and ineffective steam channeling, making the entire reservoir Steam cannot be well utilized, wasting a lot of resources, and at the same time, the adverse effects of reservoirs with poor heterogeneity will be more serious, resulting in low sweep efficiency
There are also many problems in the process of chemical flooding, such as surfactant flooding and polymer flooding: when surfactant flooding, two types of emulsions are formed, water-in-oil and oil-in-water, Then wrapping, carrying and transporting, this requires a large volume of surfactant, which is an uneconomical mining method; in the process of using polymer flooding, the polymer reduces the viscosity of the displacement fluid by increasing the viscosity of the displacement fluid. The flow rate of crude oil is beneficial to improve sweep efficiency and oil recovery. However, in heavy oil reservoirs, crude oil viscosity is high, and a large amount of polymer is needed to increase sweep efficiency. At the same time, polymer is not very good Through the low permeability zone in the oil layer, therefore, it is also an uneconomical method to exploit heavy oil reservoirs by chemical flooding
However, these structures are unstable in high-salinity and high-temperature formations and are prone to rupture; there are other factors that lead to the instability of the foam, such as the absorption of rock surface and crude oil, and the repulsion of the electric double layer of the foam liquid film. Force, water loss of liquid film, capillary suction, foam surface elasticity, steric resistance and apparent viscosity of liquid film, etc., will directly or indirectly result in low effective concentration of blowing agent, weak compressive capacity of foam, etc., causing the total volume of foam to decrease, Cannot achieve the purpose of blocking large pores

Method used

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  • Temperature-resistant and salt-tolerant foaming agent system for thermal recovery of heavy oil reservoir and preparation method
  • Temperature-resistant and salt-tolerant foaming agent system for thermal recovery of heavy oil reservoir and preparation method
  • Temperature-resistant and salt-tolerant foaming agent system for thermal recovery of heavy oil reservoir and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Heat-resistant and salt-resistant foaming agent system for heavy oil thermal recovery reservoirs, the solvent used is distilled water, and then a certain amount of foaming agent main agent, foam stabilizer, foam fixing agent, foam accelerator, alkaline substances and inorganic salts are added , and then use a magnetic stirrer to continuously stir the mixed liquid for 1.5h, and then vibrate with an ultrasonic oscillator, so that the main foaming agent, foam stabilizer, and foam accelerator can be evenly attached to the surrounding solid particles. The composition of the blowing agent system is shown in Table 1.

[0024] Table 1 Composition of temperature-resistant and salt-resistant foaming agent system in heavy oil thermal recovery reservoirs

[0025]

[0026] Put the prepared temperature-resistant and salt-resistant foaming agent system solution into a high-temperature and high-pressure reaction kettle, and age it at 300°C for 48 hours, and evaluate the foaming perf...

Embodiment 2

[0029]According to the steps in the above example 1, the composition of the foaming agent system was prepared, and its microscopic morphology was observed by scanning electron microscopy. attached by figure 1 The local structure diagram of the foam can be seen, and the foam produced is moderate in size and uniform in structure.

Embodiment 3

[0031] Following the procedure in Example 1 above, a blowing agent system was prepared. A one-dimensional single-tube model was used to evaluate the performance of the temperature-resistant and salt-resistant blowing agent system. The experimental device is a one-dimensional single-pipe model, and the sand-filled model is 50.0 cm long and 2.54 cm in diameter. Fill the core with quartz sand, place a single tube horizontally in a constant temperature oven, first saturate the core with water, measure the water phase permeability of the core, and then inject water and gas into the core at the same time according to a certain gas-liquid ratio. When the pressure difference at both ends of the core reaches a stable level, record the pressure difference at both ends of the core as the base pressure difference. The experimental temperature is 300°C, the injection rate is 3.0mL / min, the injected gas-liquid ratio is set at 1:1, and the back pressure is 8.2MPa. , the experimental results...

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Abstract

The invention relates to the technical field of heavy oil recovery, in particular to a foam agent system used for switching water drive into steam drive of a heavy oil reservoir or steam huff and puff to improve the oil recovery efficiency. According to the technical scheme, the temperature-resistant and salt-tolerant foaming agent system for thermal recovery of the heavy oil reservoir is characterized by comprising a foaming agent base, a foam stabilizer, a foam fixing agent, a foam promoter, an alkali substance, inorganic salt and a solvent. The foaming agent system can resist the temperature of 350 DEG C and has good thermal stability and better foamability; the foaming agent base in the system is lower than the critical micelle concentration and can produce more foam, the apparent viscosity is substantially increased, and the cost is saved; the foaming agent system has better solubility, causes little damage to formation and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of heavy oil recovery, in particular to a foaming agent system used for water flooding of heavy oil reservoirs followed by steam flooding or steam huff and puff to enhance oil recovery. Background technique [0002] Heavy oil, also known as heavy crude oil or high-viscosity crude oil, has the characteristics of large specificity and high viscosity, which brings a series of problems to mining and transportation. For heavy oil production, foam flooding is an economical and efficient oil recovery technology to enhance heavy oil recovery. In the process of oil displacement, commonly used non-condensable gases include carbon dioxide, nitrogen, air, and flue gas. When the non-condensable gas contacts crude oil, it can form a miscible state, which can displace crude oil with a very high recovery rate. . However, during the steam flooding process, due to the low viscosity and strong fluidity of the steam (gas) its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/518
CPCC09K8/518C09K8/584C09K8/588C09K2208/10
Inventor 赵法军刘永建王云龙吴景春黄斌张新宇
Owner NORTHEAST GASOLINEEUM UNIV
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