SU945398A1 - Method of hydrodynamic testing of absorbing formations - Google Patents

Description

The invention relates to the drilling of wells, namely to hydrodynamic studies of formations that absorb washing fluid.

There is a known method of hydrodynamically studying absorbing reservoirs by pumping fluid into the reservoir and registering the flow pattern and the process of restoring the level from dynamic to static after l has stopped pumping.

However, the known method requires special work of electro-levelers or a depth meter, a large investment of time and expenditure of production fluid for hydrological studies.

The purpose of the invention is to simplify the method of hydrodynamic research.

The goal has been achieved in that the registration of the level recovery process is carried out by measuring the velocity of the flushing fluid during the decrease from dynamic to static level with a flow meter.

When working with a flow meter (for example, Reamer Р-В), the device is lifted from the bottom at a constant speed towards the fluid injected into the well with a constant capacity to search for facets

5 google value.

The flow meter records the flow rate relative to the instrument from the bottom to the bottom of the column, plus 10–15 m in the column. On the logging data

10 receive a change in the sngnal due to the lifting speed, due to the sum of the flow rates and lifting, due to the flow rate after stopping the device.

tS in those places of the open borehole, where a uniform velocity variation of the fluid relative to the instrument is observed, the absorption zone is located

2® Rinsing Fluid.

After the termination of the valley, the change in the flow rate of the fluid and the time (time marks after –30 s) with a decrease

25 levels from dynamic to static.

values of instantaneous speeds during a decrease from dynamic to static

Claims (1)

30 calculate the level drop at intervals of time using the expression Y -.-- -Vt The excess of the liquid level over the static AH is calculated using the expression AH ii idLzY. 4-2 where At is the time interval, during which the instantaneous flow velocities of the LIQUID are averaged; V is the instantaneous rate at i-TOM according to the Ah measurement; falling liquid levels are Time At,, The specific weight is added; or fluid flow, i.e. indicator curve. . Thus, in accordance with the proposed method of hydrodynamic studies of absorbing layers, special expenses of an industrial liquid and additional devices for carrying out research are required, and the research time is reduced in connection with this by 5-10 times. Research with an electrical level or depth gauge requires 5-12 minutes of flushing fluid and 0.5-1 hours of time. For the flow meter, there is no need for special washing fluid, and the recording time of the flow rate at a lower level is no more than 1-3 minutes. The invention of the method of hydrodynamic studies of penetrating reservoirs by injecting fluid into the reservoir and registering the flow of the fluid and the process of restoring the LEVEL from dynamic to static after stopping the injection, and so on, The registration of the level recovery process is performed by measuring the rate of the flushing liquid during the reduction from dynamic to static level of the flow meter. Sources of Information Accepted in Expert Evaluation I. Viiarsky MS Methods of investigation and isolation of absorbing layers, M., Gostoptekhizdat, 1963, p. 18g-19, p.31 (prototype).