SU1456550A1 - Method of determining dynamic level of fluid in well - Google Patents

Abstract

The invention relates to a measurement technique and is intended to diagnose the operating conditions of equipment of a water-lifting well. The goal is to improve the accuracy of determining the level of fluid (GFC) in a well equipped with a submerged pump. 1. The invention relates to measurement techniques, primarily to measuring fluid levels in wells equipped with devices for lifting fluid, and can be used to diagnose operating conditions. equipment wells, in particular water-lifting wells. The aim of the invention is to improve the accuracy of determining the level of fluid in the well. The drawing shows a diagram of the device, which is explained by means of a measuring pipeline (TI). To do this, a static VL is first determined in the well and the weight of the pressure TP is measured with a submerged pump with the static VL established. Then, the well is filled with fluid, pressure TP is weighed with a pump, and the flow rate and internal diameter of the casing are measured. Based on the difference in weights of the pressure TP with a pump with a static UZH and a fluid-filled well, the measured flow rate for filling the well and the inner diameter of the casing, the static UL is determined. Then, the submersible pump is put into operation and the weight of the pressure TP with the pump is measured in the established dynamic mode. The weighting of the weights is determined before and after the pump is started up, and according to it, taking into account the depth of the static SL, the dynamic SL in the well is determined. 1 il. level of fluid in a well, general view. First, connect the pressure pipe securely. 1 with a pump 2 through a weighing meter. 3 with a lifting device; 4 (connection not shown); Then, after disconnecting the flanges 5 and 6, the pressure pipe is raised to a height of 2-3 cm. In this position, the weight meter 3 is read, after which it is necessary to wait 10-15 minutes in order to to 4 recounted O5 sd

Description

ten

15

31456550

make sure that in the annular space 7 a static liquid level is established. If during this time the readings of the weighing meter are constant, this means that the static level in the well is stabilized. This will be the first weighing, which we denote by G ,, i.e. weighing the pressure pipeline with a pump at a static level of the fluid in the well.

After that it is necessary to fill the annular space 7 with liquid, for which a flow line consisting of a counter-flow meter 11, a solenoid valve 12 and a fill level sensor 13 -20 n is connected to the fitting 40 of the pressure gauge 91 on the pressure pipe 1. on the casing pipe 14 wells. Then, the electromagnetic valve 12 is turned on and at the same time the counter-flow meter 11. When filling 25 research institutes of the annulus 7 of the well by means of a level sensor, they are switched off simultaneously. In this case, the second reading is taken from the weighing meter, i.e. the discharge of the discharge pipeline with a pump with a fully filled well G ,,, and from the meter-flow meter - the flow rate of the filled fluid in the annular space Q.

After the pump motor is turned on and the fluid level in the well is established (it is characterized by a stable steady-state reading of the weight meter 3), the third weighing of the flow line GJ is carried out. Dp determining the level of fluid in the well, it is necessary to measure the internal diameter of the casing do5 well.

The determination of the static fluid level in the well is based on Archimedes' law F Vpg, but, since the difference in weights G, - G, j F Vpg,

tt G 4 - G-i

V

tr

the volume of the displaced fluid in a pressure pipe with valves fixed to it to a static level. The amount of water poured into the well from the static level and the volume of the discharge pipe with fittings hung on it (power cable, hoo. Mutes, couplings) should be equal in sum to the volume of the casing of the well;

 with

 Q + V

St

(2)

Since V

ck

 .H

4 st

V is determined by equation (1), and Q is the value measured, then after substituting their values into equation (2) and simple transformations, we have an equation for determining the static fluid level in the well

 E9LYa + (C, - Ga)

The dynamic fluid level in the well is determined by the difference in weights at the dynamic level G and

a 30-gauge well filled fluid well G .:

N.

(3)

G, - G ,,

Udiir

g

(four)

35

 AIM volume of the displaced fluid at a dynamic level.

V

40

Where

Lee N

Lim Wed

(five)

Days

Chr

45

dynamic fluid level in the well; the average diameter of the discharge pipe, taking into account the reinforcement hinged on it, determined from the expression

V.

St Wed sr By substituting (4.) A "of equation (5), S

(6)

st

pg

(one)

(6) and VpT- - from (1) and lroved converter

value - of

calling, we will get

(G3 - G-2) HcT (

p is the density of the fluid j

buoyancy

F v

- volume displaced by the body

liquidsJ

g is the acceleration of free fall;

V

tr

the volume of the displaced fluid in a pressure pipe with valves fixed to it to a static level. The amount of water poured into the well from the static level and the volume of the discharge pipe with fittings hung on it (power cable, hoo. Mutes, couplings) should be equal in sum to the volume of the casing of the well;

 with

 Q + V

St

(2)

Since V

ck

 .H

4 st

V defined E9LYa + (C, - Ga)

N.

(3)

G, - G ,,

Udiir

g

(four)

 AIM volume of the displaced fluid at a dynamic level.

V

0

Where

Lee N

Lim Wed

(five)

Days

Chr

five

dynamic fluid level in the well; the average diameter of the discharge pipe, taking into account the reinforcement hinged on it, determined from the expression

V.

St Wed sr By substituting (4.) A "of equation (5), S

(6)

(6) and VpT- - from (1) and lroved converter

value - of

c

calling, we will get

(G3 - G-2) HcT (

H

Aim

Designating

H

GJ - Gi

G, G; R

H

P.

ANN

st

(7)

we get (8)

Example. Testing of the method is carried out on water-lifting wells. The depth of the well is 73 m, the diameter of the casing is 150 mm (0.15 m), the outer diameter of the pressure pipeline is 80 mm (0.08 m). A submersible pump ETsV 6-16-110 is installed in the well.

All measurements on the proposed method are carried out in the next post, ERSU-3K, from which the argument is given. Preparatory one- powered on sensor 13 level. Liquids. Installation of load-lifting device from the receiver - water-pressure equipment (crane with tower carrying capacity (not shown) through fitting 8, 30 kN). On the hook of the lifting device, 10, the counter-flow meter 11 of the 4th crane is hung with a weight-is (STV-12), electromagnetic valve

power cable, etc.), in the air above the static level and the rest of its parts with the pump in the water below this level.

Filling the well with fluid. Filling takes place after the electromagnetic valve 12 is turned on through a level 20 regulator.

35

measurer 3 (dynamometer DP-50). With the help of a cable (. FM mm) the pressure pipe 1 is connected to the weighing meter 3. The flanges 5 and 6 are disconnected. From the fitting 8 the pressure gauge 9 is unscrewed and a tee 10 is installed in its place, to which the pressure gauge 9 is connected. 10 connects the flow meter 11 (turbine water meter STV-15). On the flange 5, a sensor 13 of the level regulator of the level indicator ERSU-3M is installed. An electromagnetic valve 12 (ESPA-12) 30 connects a hose from meter to flow meter 11 to the annulus of the well. A level sensor and an ESPA-12 solenoid valve are connected to the electric circuit of ERSU-3M.

The pressure pipe 1 is lifted with a pump 2 by a distance of 2-3 cm between flanges 5 and 6. First weighing. The pressure pipe with pump is weighed at a steady-state static fluid level in the well, which is defined as follows. After raising the pressure pipe with a pump for a distance of 2-3 cm between the flanges, the reading is taken from the weighing meter and monitoring is made. If the weight meter reading is the same for 10-15 minutes, this means that a static level has been established in the well. This indication is the first weighing of the discharge pipe with a pump at a static level of the fluid in the well, which is 55, denoted by Cp,. Wed, 7834N. BecCf, consists of the weight of a part of a liquid-filled pressure pipe with fittings attached to it (couplings.

12 (ESPA-12) is fed into the well casing 14. When the liquid reaches the sensor level 13, the electromagnetic valve 12 is switched off via ERSU-3M. Then the readings are taken from the meter-flow measure 11, i.e. the flow rate of the filled fluid into the well is determined for its filling from the static level J 25 Q 0.372 m.

The second weighing. After the electromagnetic valve 12 is turned off, the reading is taken from the weight meter 3. This value is equal to F. 6529 N.

The weight Pj consists of the weight of the part of the liquid-filled pressure pipe with the fittings in the air above the plane of the flange 6 and the rest of it with the pump located in the liquid below the plane of the flange 6.

Third weighing. Weighing is performed at a steady dynamic fluid level in the well.

To establish the dynamic level of the fluid in the well, the pump motor is turned on and the indication of the weight meter 3 is monitored. If the weight meter reads continuously for 10-15 minutes, this indicates a dynamic level established in the well. In this case, this value is

40

50

RZ 9897 N.

The measurements obtained are used to determine the static by the formula (3) and dynamic by the formula (7) levels of the fluid in the well: H 28.450 m, NAIN 69.199 m.

 ERSU-3K, from which power is supplied to the sensor 13 level. Fluid from the receiver - water tower (not shown) through fitting 8, tee 10, counter-flow meter 11 (STV-12), electromagnetic valve

power cable, etc.), in the air above the static level and the rest of the Her9 part with the pump in the water below this level.

Filling the well with fluid. Filling occurs after turning on the electromagnetic valve 12 through the level indicator regulator.

12 (ESPA-12) is fed into the well casing 14. When the liquid reaches the sensor level 13, the electromagnetic valve 12 will be switched off via ERSU-3M. Then, readings are taken from meter-flow meter 11, i.e. determine the flow rate of the filled fluid into the well for its filling from the static level J Q 0.372 m.

The second weighing. After the electromagnetic valve 12 is turned off, the reading is taken from the weighing meter 3. This value is equal to F. 6529 N.

The weight Pj consists of the weight of the part of the liquid-filled pressure pipe with the fittings in the air above the plane of the flange 6 and the rest of it with the pump located in the liquid below the plane of the flange 6.

Third weighing. Weighing is performed at a steady dynamic fluid level in the well.

To establish the dynamic level of the fluid in the well, the pump motor is turned on and the indication of the weight meter 3 is monitored. If the weight meter reads continuously for 10-15 minutes, this indicates a dynamic level established in the well. In this case, this value is

RZ 9897 N.

The measurements obtained are used to determine the static by the formula (3) and the dynamic by the formula (7) liquid levels in the well: H 28.450 m, NAIN 69.199 m.

7 1456550 Analysis of formulas (3) and (7) shows the method from po el from the right

em that the accuracy of H

 ST

and H

AMN

depends on the accuracy of measurement of the quantities Q, P,, 9 and F,. It follows that the determination of the static H and dynamic H of the fluid levels in the well by the proposed method can be made with a predetermined accuracy. For example, if the values of ф,, 9j and, are determined with an accuracy of up to 1 kg, which is not difficult, Q is up to 0.1 m, then the accuracy of determining the static Hp and dynamic LD of the liquid levels in the well, produced by the formulas (3) and (7) will be not more than 0.005 m.

Such accuracy of these values (Hp and Ndshch) cannot be obtained by a known method due to measuring the static level of the fluid in the well with an electric level gauge, for example, the EV-III electrical level gauge.

The main reason for the low accuracy of the static level using an electric level meter (there are no other technical means) is that when lowering a throat with an electrical contact (sensor) using a rope, (wire) it is not possible to determine how many times the cable (wire) surrounds the pressure pipeline Hence it is impossible to set

There is a large error in measuring the length of the rope itself (its length reaches 200 m). When measuring such a rope length, the measurement accuracy will be tens of centimeters (according to the technical characteristics of the EV-1m electrical level meter, measurement accuracy ± 0.2 m), in addition. During the rope operation, various bends and twists of the rope (wires) occur, which lead to a decrease in the measurement accuracy.

Claims (1)

Invention Formula The method of determining the dynamic level, fluid in a well equipped with a submersible pump with a pressure pipe, including determining the static level, measuring the weight of the pressure pipe t with a submersible pump before and after putting it into operation, determining the difference in weights the level taking into account the depth of the static level, characterized in that, in order to improve the accuracy of the determination, the well is filled with liquid and the discharge pipeline with the pump is weighed, the flow rate of the fluid is measured the internal diameter of the casing and the static to determine the accuracy with which the 35 level is determined by the difference in weights but measurement of static level. Here the measurement accuracy can reach even a few meters. The second reason for the low measurement accuracy of H is that a discharge pipe with a pump at a static level and a well filled with fluid, a measured flow rate for filling the well, and an inner diameter of the casing.