Физика/5.Геофизика

Ponomareva М.V., Pak D.Yu., Petrov S.N.

KSTU, Karaganda

Definition of the profile of acceleration performance and behind-casing flow by the GIS complex in operation wells

Places of inflows and absorption of liquids in a well establish by resistance methods, thermal, photo-electric and isotopes. The method of resistance is based on studying of specific resistance arriving in a well of a formation fluid and washing liquid. The place of inflow or absorption of liquid is noted by sharp change of resistance on a curve resistivimetry. Thermal method of definition of liquid absorption into the well is based on change of temperature of liquid within an estimated site of inflow. The place of inflow and absorption of water is noted by change of temperature of liquid – its increase or decrease according to the thermogram. Photoelectric method of identification of liquid absorption into the well is based on comparison of transparency of the fluid arriving in the well, and solution on a water basis. Transparency of liquid in the well determine by the device measuring a potential difference in a chain of a photocell, lighted by an electric light bulb through a layer of studied liquid.

Method of isotopes establishes an absorption place by the curve of a gamma method received after injection of isotopes, which is compared to the curve of the gamma method, registered before introduction of activated liquid in the well. Intervals of inflow are noted on the curve of a gamma method registered after injection of isotopes, raised γ-radiance.

Definition of a profile of acceleration performance was carried out in the well No. 60e of a field of Aschisay. Conditions of measurements – in an operational column; artificial bottom plug – 1229.0 m; perforation interval – 1216.0-1225.0 m; wellhead pressure – 2.0 atm; output – 33.0 m3/d. In the well for solution of an objective the following researches were executed:

1. In the working well: thermometry, barometry, resistivimetry, water content measurements, BTI (an inflow heat indicator), gamma-ray logging, collar locator on the scale of 1:200, in the range of 1191.0-1232.6 m.

2. In the stopped well: thermometry, barometry, resistivimetry, water content measurements on the scale of 1:200, in the range of 1191.5-1232.6 m.

Results of researches are given in table 1, figure 1.

Table 1 – Results of researches on a well No. 60e

Parameters			Participating methods				Result
1. Maximum profit of device, m			Locator methods				1232,6
2. Perforation intervals, m			declared 1216,0-1225,0				factual 1216,0-1225,0
3. General output , m^3/h			BTI				27,2
Statics
4. Manometer pressure down the hole			Depth, m	Meaning
in the roof of perforation holes			1216,0	122,1
down the hole			1232,6	123,4
5. Temperature by HST, ^0С
in the roof of perforation holes			1216,0			39,7
down the hole			1232,6			52,6
Dynamics
6. Pressure by manometer, atm			Depth, m			Meaning
in the roof of perforation holes			1216,0			139,1
down the hole			1232,6			141,5
7. Temperature by HST,
in the roof of perforation holes			1216,0			42,7
down the hole			1232,6			52,9
8. Researches of the stream and composition of liquid in a trunk
Perforation intervals, m	Operating intervals,m	Fluid composition			Coverage ratio, %
1216,0-1225,0	1222,1-1225,0				32,2

Figure 1 – Definition of acceleration performance profile and behind-casing flows

By results of interpretation of the geophysical researches conducted in the well No.60e it is possible to draw the following conclusions:

1. The maximum depth of passing of borehole devices with account of a dead zone made 1232,0 m. Perforation is confirmed in an interval 1216,0-1225,0m.

2. Measurements were carried out in two modes: static and dynamic. In a static mode pressure and temperature in a perforation roof, respectively, 122,1 atm and 39,7 ⁰С, down the hole, respectively, 123,4 atm and 52,6 ⁰С. In a dynamic mode pressure and temperature in a perforation roof, respectively, 139,1 atm and 42,7 ⁰С, down the hole respectively 141,5 atm and 52,9 ⁰С.

3. By the curves of a borehole thermoconductive flowmeter (BTI) and the highly sensitive thermometer (HST) there allocated working intervals: 1222,1-1225,0 m.

4. In a studied interval behind-casing flows aren't revealed. The bottom is leak-tight.

Literature

1. Geophysical researches and works in wells: в 7т. Т.3. Studies of acting wells/R.А. Valiullin, R.К. Yarullin, Ufa, Informreklama, 2010

2. Kuznetsov G.S., Leontev Ye.I., Rezvanov R.А., Geophysical control methods of development of oil and gas fields, М., Nedra, 1991