SU787626A1 - Method of determining the dynamic level of fluid in borehole - Google Patents

Description

The essence of the method for determining the dynamic level is as follows.

Initially, prior to the descent of the ESP into the well, the static level of the HL-I fluid and its specific gravity were measured using regular methods. At a given technological mode of operation of the well (with an established dynamic fluid level), the daily flow rate Q is determined and the wellhead pressure P is recorded.

Then the complete production of the well is directed to the annulus and further to the bottom of the well, whereby the level of fluid in the well gradually rises from dynamic N to static H, because no fluid is taken from the well and the fluid circulates in a closed system.

Adjusting the manifold valve sets the flow rate of the well, equal to the initial productivity Q of the well.

At the same time, the pressure at the wellhead gradually rises from the initial P to the final P ,,. which shows the wellhead pressure at its performance Q from a static level, since production-,. the water flow measured by the flowmeter of the fluid circulated in this case is equal to the initial one, i.e. the well flow rate, and the fluid level in the well corresponds to static H,

st

According to the well-known formula

where P is the pressure, which in the proposed method is equal to

R -

the height of the liquid column

which is equal to i ... ,,,

P.VIH

 st

specific gravity of the fluid.

Substituting the values into the formula, we get

RR - C AND AIN-No) Y. 1 1 0

where Ndu, c and N. - dynamic and

static fluid levels.

Further, the dynamic fluid level will be equal to

 n (m)

Din

st

As a result of the use of the invention, the number of emergency situations is reduced, the volume of tripping operations is reduced, the length of the tubing string is reduced, the oil production is increased and its cost is reduced.

Claims (2)

Invention Formula Method for determining the dynamic level of fluid In a well equipped with a centrifugal electric pump, including measurements of flow rate and pressure at static and dynamic fluid levels, characterized in that, in order to increase reliability, the static level is restored by supplying the fluid withdrawn from the well through the wellhead into the annulus at constant debit equal to the initial debit from the static level,. Sources of information taken into account in the examination 1, Sharipov A.G. et al. Method for determining the pressure at the inlet of a submersible centrifugal electric pump. Oilfield, 1971, № 4, p. 113. 2. Muraviev V.M. Operation of oil and gas wells. Nedra, M., 1973, p. 268-269.