Oil well response stage dividing and distinguishing method under carbon dioxide miscible displacement condition
A technology of carbon dioxide and discrimination method, which is applied in the field of oil reservoir dynamic analysis and research, can solve the problems of strong subjectivity, unscientificity and blindness of oil well production characteristics, and achieve the effect of emphasizing objectivity, enhancing scientificity and overcoming subjectivity.
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[0026] In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are listed below in conjunction with the accompanying drawings, which are described in detail as follows.
[0027] Laboratory tests show that the solubility of carbon dioxide in crude oil increases with increasing pressure, and at a certain pressure P x The solubility of carbon dioxide in crude oil under conditions is R x . Under theoretical conditions, when the reservoir pressure is maintained at a certain level (higher than the reservoir saturation pressure), the production gas-oil ratio and carbon dioxide content of the oil well are fixed: before the front edge of the carbon dioxide miscible zone breaks through the bottom of the well, the carbon dioxide content at the wellhead is equal to the original formation Medium carbon dioxide content C i , The produced gas-oil ratio is equal to the original dissolved gas-oi...
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