SU1469110A1 - Method of determining well parameters - Google Patents

Description

(21) 4194776 / 23-03

(22) 13.02.87I (46) 03/30/89. Bul № 12

(71) Bugulminsky integrated department of the All-Union Oil and Gas Research Institute

(72) E.L.Gerasimov, Yu.V.Kononov, I.I. Laptev, E.P.Lukov:

and A.N. Sitnikov

(53) 622.276 (088.8)

(56) USSR author's certificate 1178896, cl. E 21 B 47/06, 1983.

(54) METHOD FOR DETERMINING PARAMETERS Bore

(57) The invention relates to the oil industry and makes it possible to measure the flow of production from a well at any point. A pipeline (TP) with a check valve and a load installed at the end is lowered into the column to the depth of the pressure measurement and the Rayhod. In TP, back pressure is created by pumping a working agent into it before the valve is opened. At the time of opening the valve, the pressure in the TP is judged on the pressure in the cavity of the column at the depth of measurement. Then, a hydraulic resistance element, which is movable relative to the TP and the well, is introduced into the pressure measurement zone. The back pressure in the TP is reduced and the additional pressure in the well is determined from the pressure in the TP at the time of opening the valve. The difference in primary and secondary pressures determines the flow rate of the well production. The method can be used in wells of all categories, including high-temperature, in particular, steam-injection wells. It does not require the descent into the well of electronic-mechanical sensors and pressure transducers. 1 il.

i

(L

The invention relates to the oil and gas industry, in particular to the measurement of pressure and flow mainly in high temperature wells.

The purpose of the invention is to make it possible to measure the flow rate of a well’s production at any point.

The drawing shows a device that implements the method.

The device comprises a pipeline 1, in the lower part of which a check valve 2 and a load 3 are installed. A pressure recorder 4 is installed at the outlet of the pipeline from the well. The supercharger 5 is connected to the pipeline 1 via the pressure regulator 6. The pipeline 1, together with the hydraulic resistance element 7 on the traction device 8, is lowered into the column 9 of the tubing.

The well parameters are determined as follows.

Into the column 9, to the depth of the pressure and flow measurement, the pipeline 1 is lowered with the check valve 2 and the load 3 installed at its end. In the pipeline 1, the back pressure is created by pumping a working agent into it through the compressor 5 and

05 WITH

314

pressure regulator 6 smoothly increases the pressure, which is constantly measured by pressure recorder 4. When the pressure in line 1 reaches a value equal to the pressure in column 9 at the depth of measurement, the check valve 2 is open.

At the moment of opening the valve, the pressure increase in the pipeline stops, which is determined by the readings of the pressure recorder 4 connected to the wellhead at pipeline 1. The pressure in the pipeline at the time of opening of valve 2 is judged on the pressure R. in the cavity of column 9 at the depth of measurement. Thus, one of the well parameters, pressure, is measured.

To measure another parameter — flow rate, for example, in a steam pumping well, when steam or water moves downward from a column of pump-compressor pipes, a predetermined distance from check valve 2 from the top along column 9 is inserted on a traction body 8 (scraper wire , spent armored geophysical cable, etc.) mobile with respect to the pipeline and the borehole of the hydraulic resistance element 7 and, similarly to the above, determine the pressure in the borehole from the pressure in the pipeline at the moment of opening to Apaana whose F value is less than the previously measured value of the pressure P. Before additional pressure measurement, the back pressure of the working agent in line 1 is reduced. After additional pressure is measured, the flow resistance element is retracted from the point of measurement. Consumption of products is determined by the difference between the main P and the additional P pressures.

The volumetric flow rate, for example, an incompressible fluid, injected into the formation through a water injection well, is determined by the formula

q about

 -F. T || (PI - PI) (1)

YaoE volumetric flow; 55

d- - flow rate (passport data of the selected hydraulic resistance element);

5 0 with Q

0

five

ABOUT

FP is the flow area of the hydraulic resistance element; p is the density of the liquid.

Example. The operability of the method is confirmed by the results of the following experiment. In a horizontal pipe closed at one end with a length of about 8 m and an internal diameter of 62 mm, a pipe with an internal diameter of 36 mm is concentrically mounted. Through the cavity of the inner tube and the annular space between the outer and inner tubes, tap water is circulated with a temperature of about. The volume flow through the model is controlled by an HP 1.6 / 25-H1 plunger pump and a pressure regulator installed at the outlet of the annulus. A pipeline is introduced into the cavity of the inner tube; it is a copper capillary with an inner diameter of 4 mm and a wall thickness of 1 mm with a ball check valve installed at its end. The counterpressure measurement in the copper capillary is carried out using an exemplary manometer of 0.4 accuracy class. The measurement of the volumetric flow rate is carried out by pumping time through the model of water from a tank with a volume of 3 m. A diaphragm with a hole of 25 mm in diameter is used as a hydraulic resistance element.

According to the formula (1), 115

F 1 (0, 006) 0.4610

R 1000 kg / m; P 1.18-10 gf / m and Pti 1.1 10 kgf / m determine that for the experimental conditions the consumption coefficient is about / 859.5. Changing the water flow rate and measuring the pressure P and P before entering and after entering the diaphragm into the inner tube at d 859.5, formula (1) determines the number of volume flow values in accordance with the method. The results are shown in the table.

The proposed method allows production. measure the flow rate with sufficient accuracy for practice. Thus, the average absolute and relative errors of flow determination are 0.028 and 2.1%, respectively. The implementation of the method does not require the descent into the borehole of an electronic-mechanical dat5U

Claims (1)

converters and converters pa descent. This allows it to be used in wells of all categories, including high-temperature, in particular, steam injection wells. Invention Formula A method for determining well parameters, including the descent of a pipeline with a check valve installed at the end, the creation of back pressure before the valve is opened, and the determination of the pressure in the well from the pressure in the pipeline at the time of opening the valve so that, in order to make it possible to measure the flow rate of a well’s production at any point, a flow resistance element movable relative to the pipeline and well is introduced into the pressure measurement zone, the counterpressure in the pipeline is reduced and in addition, the pressure in the well according to the pressure in the pipeline at the time of opening the valve, and the difference in the main and additional pressures determine the flow rate of the well.