Method for increasing single-well output of heavy oil well through indigenous microorganism

Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for increasing single-well output of a heavy oil well through an indigenous microorganism. The method comprises the following steps that the indigenous microorganism of a testing oil well is detected; the testing oil well is screened; an activator of the testing oil well is screened; the injecting amount of the activator is determined; the field injecting technology of the activator is determined; and the field test of the testing oil well is conducted. According to the method for increasing the single-well output of the heavy oil well through the indigenous microorganism, the investment cost is low, the implementation technology is simple, and the situations of well sanding and casing pipe damage do not occur; the viscosity of heavy oil can be greatly reduced, the flowing property of crude oil is improved, oil-water interfacial tension can be effectively reduced, the oil-water mobility ratio is reduced, the period of validity is long and exceeds 20 months, the oil enhancement effect is good, the range of daily oil increment of a single well is more than 50%, and the input-output ratio is greater than 1:3; and therefore, the method for increasing the single-well output of the heavy oil well through the indigenous microorganism is an economical and effective method to improve the output of the heavy oil well and can be widely applied to a single well huff and puff oil production technology of the heavy oil well.

Description

1. Technical field [0001] The invention relates to a method for tertiary oil recovery, in particular to a method for increasing single well production by endogenous microorganisms in heavy oil wells. 2. Background technology [0002] my country's onshore heavy oil resources account for more than 20% of the total petroleum resources. The national heavy oil resources are about 19.87 billion tons, and the proven heavy oil geological reserves are about 2.06 billion tons. The crude oil production of heavy oil reservoirs has reached 7% of the total crude oil production, and the development of heavy oil has become an important part of crude oil production in my country. And with the reduction of light oil production reserves, the proportion of heavy oil production will continue to increase. [0003] Due to the high content of asphalt colloid and low wax content, heavy oil has high viscosity, difficult flow, and great difficulty in mining. At present, steam stimulation technology i...

AI Technical Summary

Problems solved by technology

However, the steam huff and puff technology has the following problems: the cost of generating steam is high, especially in areas where water resources are scarce and water prices are high, and water treatment costs are high; due to steam injection, oil well heat loss, sand production, casing damage, etc. More serious, affecting the utilization rate of oil wells and the implementation of process measures; with the increase of steam stimulation rounds, the water content in the near wellbore area rises, consuming most of the steam heat, and the effective utilization of heat energy becomes poor, resulting in poor steam stimulation effect; Some heavy oil wells completed by non-thermal recovery cannot perform steam injection

But, there are following shortcoming and deficiency in this application: (1) because the CO injected 2 Water channeling is serious, and the amount actually soluble in heavy oil is limited, resulting in poor viscosity reduction effect; (2) due to CO 2 Corrosive, therefore, during the extraction of crude oil, there is constantly CO 2 (3) the present invention adopts exogenous microorganism to improve single well production, because the exogenous microorganism reservoir adaptability of screening is relatively poor, therefore, field test effect is limited