SU407037A1 - DEVICE FOR MEASUREMENT OF FLOW AND DENSITY OF LIQUID IN THE WELL - Google Patents

Description

one

The invention relates to instruments for measuring the flow of liquids and gases in wells by pressure drop across a restriction device and density, the difference in hydrostatic pressure at a known height, and is intended to conduct hydrodynamic and physical studies of the formation to monitor and control the development of oil and gas fields.

Widely known flow measurement instruments are based on the principle of variable pressure differential. The flow rate is determined by the pressure drop across the restricting element, which is recorded in units of volumetric flow. However, the differential pressure also depends on the density of the liquid. This is especially important in the oil industry, since the density, even at a constant temperature, varies within a wide range, depending on the relative content of oil, water and gas in the well fluid. For one-dimensional density measurement, a second meter, a density meter, is usually used in combination with a flow meter. In this way; To obtain flow rate readings with a density correction, it is necessary to have two instruments: a variable pressure drop flow meter and a density meter. This leads to a complication of the device as a whole and, therefore, the sake of reliability.

The aim of the invention is to provide the possibility of measuring the flow rate and density of a liquid in a scBa / ciae ;; PM by a measuring unit. This is achieved by the fact that the restriction element, made in the form of a packer, is movably connected, for example, by means of a spring with a differential pressure block, with the possibility of displacing pressure receivers relative to the restriction element.

On the chrtege given the proposed device, the abundance of the form.

It contains a device for measuring and recording pressure drops 1 and a packer device 2 interconnected by a tension spring 3. Device 1 contains two gauge receivers 4 and 5 which are hydraulically connected to a differential pressure gauge.

in block 6, to the Imat: cally connected with the recording unit 7. In the upper part of the device 1 is fixed, co-ed wire 8, on which the iriyor is lowered down; ac1y Packing device 2 Maintenance control unit 9

disclose hacker with and astips 10, covered with D; and E; 1 st STI OO (V104; i) ii.

During the descent of the instrument on Groiolok 8 into the well, a siege of a packer is carried out at the depth of the block on the depth of the block.m. 9. In this case 3

Triches fipiic MiiiiKH 4 and 5 are located on both sides of the joint of the restricting element for the passage of fluid from the packer (position I). In the case of differential pressure L registered by block 7, is proportional to c.-iGpoc; fluid movement therefore

H where; - coefficient of local resistance; y is the specific gravity of the fluid; V - flow rate in section A-A; g is the acceleration of the force t goteni. The flow rate Q is equal to QV - (where D is the diameter of the cross section for the passage of fluid in the constriction device; d is the diameter of the housing of the diffiometric unit. G depends on the degree of flow constriction in section A-A and is constant in this case, since dimensions d and D and the configuration of the section np i6opa and the packer are constant.From equation (1) it follows: 2КР For measuring and recording 7-3, also for correcting the density o (Q -) in formula (2) device 1 using wire 8, raise to the height I to the conclusion from the section A-A of the narrowing element of the packer (position I). In this case, the difference A, o, lavlivaemy same manometric receivers 4 and 5, only obuslovlivaets specific gravity and the difference in fluid height positioning receivers 4 and 5:

 R

(3)

D /; - | - / g 1.

h where / 1 is the distance between gauge receivers. Substituting the value 7 from (3) into (2), we obtain the expression for the velocity V and the flow rate Q - (in this formula, all values are nonstop, except for AP and A / 7, which are recorded by block 7. When device 1 moves to the height H, on command from the surface, its main nodes occupy positions I and II, respectively. In the drawing, DC is the diameter of the well Subject of the invention A device for measuring the flow and density of a fluid in a well, comprising a housing, a restricting element, a differential pressure meter with two pressure receivers and a recording unit , different in that in order to permit flow and density measurement with one measurement unit, sul ayuschy element vynolneiny a packer Mob Leno connected, e.g., via a spring with Differential pressure unit is movable relative to the pressure receivers orifice element.