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Remaining oil saturation analysis method

A technology for remaining oil and saturation, which is used in earth-moving drilling, surveying, wellbore/well components, etc. It can solve the problems of difficulty in storing and preparing tracers, and the accuracy of remaining oil saturation data needs to be evaluated. Accurately obtain, improve the accuracy of the effect

Pending Publication Date: 2021-11-05
北京永源思科技发展有限公司
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Problems solved by technology

Since reactive tracers are difficult to store and prepare on the ground, there are various interferences and losses during formation migration, and the accuracy of the analyzed remaining oil saturation data needs to be evaluated

Method used

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  • Remaining oil saturation analysis method
  • Remaining oil saturation analysis method

Examples

Experimental program
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Effect test

Embodiment

[0033] Such as figure 1 As shown, a method for remaining oil saturation analysis includes the following steps:

[0034] Step 1: Inject two inert distribution tracers A and B into the water injection well in the form of pulse input, and the oil-water dynamic partition coefficient K of the two distribution tracers d，A / K d，B Value range ∈ (0,10);

[0035] Step 2: After the water injection well is injected, take water samples from the production wells for analysis, measure the concentration of each tracer in the water sample for a certain period of time, draw a curve, and analyze the cumulative output quality of each tracer; GC can be used - MS or GC-MS-MS or other analytical methods or equipment analyze the mass concentration of the tracer, and the cumulative output mass can be obtained through area integration. In addition, in engineering practice, the trail of the tracer is long, and it is difficult to sample all the tracers. When the tracer enters the wake, there will be ...

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Abstract

The invention discloses a method for analyzing the saturation degree of residual oil, which comprises the following steps of: injecting two inert distribution type tracers into a water injection well in a pulse input manner, sampling in a peripheral production well, and analyzing the accumulated mass of the output of the tracers according to the concentration data of the two tracers in the sample. The statistical law of the communication process is studied according to the mass ratio of tracers accumulatively produced by a production well, the average value of analysis volume factors, the saturation degree of remaining oil and the like. According to the method adopted by the invention, only two inert tracers are injected to determine the relative remaining oil saturation of the communication channel, and a reactive tracer is not needed, so that interference and loss caused by the fact that the reactive tracer is difficult to store and prepare on the ground can be avoided, and the accuracy of an analysis result is improved; by adopting the method, the saturation of the remaining oil can be more economically, quickly and accurately obtained, and an important basis can be provided for secondary oil recovery or tertiary oil recovery.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and specifically relates to a method for analyzing remaining oil saturation. Background technique [0002] Reservoir cognition is the core technology in oil and gas exploration and development process. The more the macroscopic and microscopic understanding of reservoirs and production layers tends to be objective facts, the greater the guiding value for exploration and development. [0003] The research on remaining oil is the core of secondary oil recovery and tertiary oil recovery. Evaluating the remaining oil saturation of the production zone is the key to development. The existing remaining oil testing technology is mainly based on logging technology and tracer testing technology. Tracer testing technology originated in the 1960s. After years of research and practice, a set of tracer remaining oil test methods has been formed. All analytical methods are based on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11E21B47/00
CPCE21B47/11E21B47/00
Inventor 单永斌吴耀光
Owner 北京永源思科技发展有限公司
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