How to manage self-injection wells

Oil recovery method usually refers to the method used to extract crude oil flowing to the bottom of the well to the surface, which can basically be divided into two categories: one is the method
of extracting oil to the surface with the help of external supplementary energy, which is called artificial lifting or mechanical oil recovery.
The other type is to rely on the energy of the oil layer itself to spray oil to the ground, called self-injection oil production method
.

If the oil reservoir has enough energy, not only can the crude oil be driven from the oil reservoir into the bottom of the well, but also it can be continuously lifted from the bottom of the well to the surface, such a production well is called a self-injection well
.
Oil production with this self-injection method is called self-injection oil
production.

Self-injection oil production is the most economical and simple oil recovery method, which is generally suitable for the early stage of
oilfield development with sufficient stratigraphic energy.
So why do oil wells spray themselves? To automatically flow crude oil to the surface, it is necessary to overcome the resistance in four aspects: (1) the flow from the oil reservoir to the bottom of the well--- the seepage resistance in the oil reservoir; (2) The flow from the bottom of the well to the wellhead --- the flow resistance in the wellbore; (3) Separator from wellhead to metering station - pipe flow resistance in surface pipelines; (4) For most self-injection wells, there is also a flow through the nozzle - nozzle flow resistance
after crude oil reaches the wellhead.
Crude oil in the oil reservoir must have enough energy to overcome the above resistance in order to self-injection
.

Self-injection shaft management should mainly pay attention to three aspects: (1) manage the production pressure difference; (2) Take all accurate materials; (3 Ensure the normal production of oil wells
.
These three aspects are interrelated and mutually promoting in production, and none of them can make the oil well obtain high yield and stable production, but the management of production pressure difference is the key
.
Under normal circumstances, the control of the production pressure difference is achieved by changing the size of the nozzle on the
ground.

Under the condition of multiple oil layers, only using a wellhead and an oil nozzle to control the production of the whole well cannot be reasonably produced for each small layer, and each small layer must be controlled separately, that is, the layered mining technology
is adopted.
The layered exploitation of oil wells and the layered injection of water wells are aimed at giving full play to the production capacity of medium and low permeability layers while developing high permeability layers, adjusting the contradictions between layers, and making oilfields stable and self-injection and high production for a long time at a certain oil production
speed.