SU1706664A1 - Vacuum drilling-mud degasser - Google Patents

Abstract

The invention relates to devices used for degassing drilling fluids when drilling oil and gas wells. The aim of the invention is to improve the reliability of the vacuum degasser and the efficiency of the degassing process. A vacuum degasser containing a degassing tank with plates, a discharge chamber with discharge and receiving valves, a vacuum line with a relief valve and a level regulator, is additionally supplied with a storage tank, the inlet of which is connected to the degassing tank, and the outlet with the receiving valve of the drain chamber, The degassing tank plates have parallel protrusions located at an acute angle to the plate base. The use of accumulator and protrusions on the plates will allow, depending on the flow rate of the drilling fluid and the non-size of the vacuum in the degassing chamber, to increase the proportion of gas removed from the solution by 10-30%. 3 ill., 1 tab. (Ls

Description

The invention relates to devices used for degassing drilling fluids when drilling oil and gas wells and can be used in the oil, gas and other industries.

FIG. 1 schematically shows a degasser diagram, a longitudinal section; in fig. 2 - degassing plates: in FIG. 3 - level control and relief valve.

The degasser contains a degassing tank 1 equipped with degassing plates 2, a storage tank 3 (intermediate tank, drain tank 4 in which the level regulator 5 is installed. For alternate communication of the drain tank with vacuum and atmosphere, the level regulator is connected to the bypass valve 6 installed on the vacuum line 7. Drain tank is equipped with a receiving 8 and discharge

9 valves, which are plates that overlap the valve seat under its own weight and pressure difference. Degasser equipped with a regulator

10 flow rates, tanks of carbonated solution 11 and degassed solution 12. The container 11 of carbonated solution is connected with the degassing tank 1 by the suction pipe 13. The plates 2 are provided with parallel projections 14 located at an acute angle to the base of the plates,

The 5-level regulator is provided with a float 15 and is connected with the rod 16 of the spool device 17 through a hinge 18, a lever 19 and an anvil ring 20. The spool 17 reports

vj O O O O Ј

the bypass valve 6 alternately with vacuum and atmosphere through the vacuum line 7. The valve 6 is equipped with a diaphragm 21, a stem 22 and spring-loaded valves 23 and 24. The degasser operates as follows.

The drilling fluid through the suction pipe 13 through the flow controller 10 flows under vacuum into the degassing tank 1, spreads along the lugs of the degassing plates 2, degasses and drains into the accumulator 3. And from it through the receiving valve 8 into the drain tank 4. At the moment when the drain tank 4 is completely filled, the level controller 5 through the bypass valve 6 communicates it with the atmosphere and closes the vacuum line 7, preventing the vacuum in the degassing tank 1 and the intermediate tank 3 from decreasing. m differential pressures in intermediate 3 and drain 4 x closed containers and outtake valve 9 under the influence of the hydrostatic pressure of the drilling solution is opened, and is freed of the downcomer barrel 4 from the degassed solution. The drilling fluid entering the degasser at the moment of draining is degassed on the plates 2 and flows into the accumulator 3. After the entire degassed solution is drained from the drain tank 4, a level 5 regulator through the overflow valve 6 connects the drain tank 4 to the vacuum line 7 and the discharge valve 9 under the action of vacuum closes.

At the initial moment of operation of the valve G, the stem 16 of the spool valve 17 is in a position connecting the region of the relief valve located under the diaphragm 21 with the atmosphere. In this case, the membrane 21 is in the upper position, the valve 23 is closed, and the valve 24 connecting the drain container 4 to the main vacuum line 7 is open. As the drain tank is filled with a degassed solution, the float 15 floats, driving the shaft of the hinge 18, on which lever 19 is rigidly fixed outside the tank. When the drain tank is full, the lever 19 presses the left thrust ring 20 and moves the rod 16 of the spool 17 to connecting area under the membrane with auxiliary vacuum line 7 The membrane 21 under the action of vacuum is lowered, closing the valve 24 with the help of the stem 22 and opening the valve 23. The solution is drained from the container. As the solution is drained, the float 15 is lowered and with full emptying the lever 19 presses the right stop ring 20 and moves the rod 16 to its original position, while

wherein the area under the membrane 21 communicates with the atmosphere. In this case, under the action of vacuum and spring, the overflow valve 6 occupies the initial position. The membrane bends upwards, closing the valve 23 with the help of the stem 22 and opening the valve 24. A vacuum is created in the drainage tank.

Upon reaching a vacuum in the discharge tank of 4 BALANCES Re RVPRON - RHydrooa,

Rvprom - vacuum in accumulator 3; Hydrostat. - hydrostatic pressure of the degassed solution accumulated in the intermediate tank 3 at the time of discharge, receiving

the valve 8 opens; the solution collected in the accumulator 3 and coming there from the degassing tank 1 flows into the drain tank 4 until it is completely filled, i.e. started a cycle similar to that described.

The degassing ability of flat degassing plates and plates provided with protrusions is estimated by the proportion of gas (H) y removed from the carbonated solution

Dy / -XL (- & - Ј- Az V /}, - p,

) 100 % .

A drilling fluid containing is used as a working fluid. %: clay 5: KSSB-4 5; water the rest.

The original solution has the following properties: density (/ A) 1.05 g / cm; plastic viscosity (/ ml) 4 mPa; dynamic shear stress (ia) 51 Pa: static shear stress (V) 1/10 24.5 / 35 Pa; conditional viscosity (HC) 25 s

The initial solution is carbonated in a disperser to obtain a density of a carbonated solution / 0.85 g / cm3 (initial gas content H -20%).

Aerated drilling fluid is poured into the receiving tank, a vacuum pump (not shown) creates a vacuum in the degassing tank 1, sets the adjusting valve to the position corresponding to the required flow rate, and, opening the stop valve, passes the carbonated solution through removable degassing plates (flat and equipped with protrusions) for 6 s. After that, close the stopcock, turn off the vacuum pump and, when the gas valve is released, report the cavity of the degassing chamber 1 with the atmosphere. Open the drain valve of the tank 1 and measure the density of the degassed solution (rd)

The results of comparative studies of the degassing ability of flat

degassing plates and plates provided with protrusions are shown in the table.

The invention allows to increase the proportion of gas removed from the solution by 10-30%.

Claims (1)

Claims The vacuum degasser, containing a degassing tank with plates, a drain chamber with receiving and exhaust valves and a level regulator, communicates By means of a bypass valve with a vacuum pump, characterized by m ° that, in order to increase the reliability and efficiency of the degassing process, the degasser is equipped with a storage unit, the input of which is connected to the degassing tank, the output is connected to the receiving valve of the drain chamber, and the degassing tank plates are equipped parallel protrusions located at an acute angle to the plates. To Vacuup Asosu 1 J / 1 yurobomy pump L Surface section. - - solution - vacuum, g / / Y Satyyn-Hucocy Editor S. Peckle Sacks221 Compiled by T. Vostrova Tehred M.MorgentalKorrektor M. Sharoshi Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production-publishing plant Ptent. i Uzhgorod, str. Ga. G. -n., .-, Phie.2 Uz of degassing capacity Fig.Z