Oil layer coagulating type oil reservoir mining method

Abstract

A oil layer concreting type oil pool mining method includes the following steps: 1. When the maximum of heat liquid <=100 ton in every time, mining methods are executed repeatedly by the following steps: (1) inpouring pour point depression thinner; (2) inpouring heat fluid mixed with pour point depression thinner; (3) depressed well reaction, spray; 2. When the maximum of heat liquid >100 ton in every time, mining methods are executed repeatedly by the following steps: (1) inpouring pour point depression thinner; (2) inpouring heat fluid mixed with pour point depression thinner; (3) normal oil pumping by oil extractor; (4) stopping production and closing well when the load of oil extractor reaches relational extract oil regulations data or increasing 10-30% of regulations data in 24 hours suddenly; Oil well casing tube injects pour point depression thinner and heat fluid mixed with pour point depression thinner into oil layer orderly, and then laying spray, oil extractor extracts oil normally. The product of the invention has the advantage of low production cost, long production period of oil well, being safe and reliable in increasing well yield, remarkable economic benefit, etc.

Description

technical field [0001] The invention relates to a crude oil production and exploitation method, in particular to an oil layer solidification type oil reservoir exploitation process. Background technique [0002] At present, in the production of crude oil, it is unavoidable to exploit oil layer solidification type oil reservoirs. The main feature of this type of solidified oil reservoir is that the natural temperature of the oil layer (reservoir) is less than or equal to the freezing point of the crude oil in the reservoir, so this type of crude oil may be in a solidified state in the oil layer (reservoir) and cannot flow normally. This kind of solidified oil reservoir is extremely difficult to exploit, the exploitation cost is high, and even cannot be exploited, resulting in a large amount of energy waste and economic loss. The existing technological methods for exploiting such reservoirs include dynamic fluid method, steam method, microbial method, organic solvent method, ...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages when it is directly applied to solidified oil reservoirs: First, it is difficult to inject steam with ordinary wellbore structures due to the serious constraints of oil layer geological conditions and reservoir pressure, and complex downhole processes such as double wells or double pipes are required Second, it is difficult to use a large amount of high-temperature and high-pressure steam for those solidification-type reservoirs that have adverse effects on oil layers at high temperatures, that is, solidification-type reservoirs with severe heat sensitivity; Reservoirs must always be maintained at a temperature far exceeding the freezing point of crude oil, which requires a large amount of steam consumption, resulting in high oil production costs; fourth, the process is complex, and the control of steam temperature, dryness and reservoir temperature field is difficult, and condensation pipes are prone to occur. , wax card and other oil production accidents; fifth, the method is still in the experimental stage in China, and it is difficult to be practical and large-scale application

This method has the following disadvantages when directly applied to solidified oil reservoirs: first, it is severely restricted by the geological conditions of the oil reservoirs and reservoir pressure, and it is difficult to inject; The third is that its pour point and viscosity reducing ability has a strong timeliness, that is, as time goes on, the organic solvent in the solidified reservoir crude oil gradually weakens or disappears the pour point and viscosity reducing ability of the crude oil. The freezing point and viscosity of crude oil will gradually increase until they return to their original state, so it is difficult to provide sufficient production time for the oil recovery process and fail to meet the practical requirements of production; fourth, its safety is low; It is difficult to be used in the production of solidified oil reservoirs, and there is no successful application example in China.

Since this method cannot effectively solve the fluidity problem of crude oil in solidified oil reservoirs and is difficult to inject, it is difficult to directly use it in the production of solidified oil reservoirs in China at present.

[0014] In a word, the comprehensive effects of the above methods are not ideal when exploiting solidified oil reservoirs.