SU979614A1 - Drilling mud storage and recirculation arrangement - Google Patents

Description

(54) DEVICE FOR STORAGE AND CIRCULATION OF DRILLING SOLUTION

one

The invention relates to mining industry, namely, oil and gas production and can be used for drilling wells in circulating systems.

Circulating systems are known in which drilling fluid storage and circulation devices contain a container with inlet and outlet nozzles and partitions dividing the capacity into compartments 1.

The drawback of the device is that it is impossible to empty the container without the use of additional means.

The closest in technical solution is a device for storing and circulating drilling mud, comprising a sealed tank with blind partitions, which divide the latter into compartments having valves in the upper part, inlet and outlet 2.

A disadvantage of the known device is that stagnant zones are formed, in which the drilling fluid stratifies and loses its quality and properties, moreover, it is impossible to carry out

emptying the tank without the use of additional funds.

The purpose of the invention is to improve the quality of movement of the drilling fluid and to ensure the self-emptying of the tank.

The goal is achieved by the fact that a device for storing and circulating drilling mud, including a sealed tank with blind partitions, divides the latter into compartments having a valve in the upper part, inlet and outlet

10 nozzles, equipped with hydraulic gates and additional partitions installed in the middle of each compartment, while hydraulic gates are located on all partitions.

FIG. 1 shows a device for

15 storage and circulation of drilling fluid, longitudinal section; in fig. 2 shows section A-A in FIG. one.

The device contains a sealed tank 1 made of steel sheet with inlet 2 and outlet 3 nozzles for drilling mud. The tank 1 is divided by deaf partitions 4 into separate compartments 5, which are interconnected by hydraulic locks 6, inside each

Additional compartments 7 are installed in the compartment, the height does not reach the roof of the tank. The parts of the compartment separated by additional partitions 7 are hydraulically connected to each other by hydraulic locks 8. To release air when the compartments are filled, valves 9 are installed in their upper part, which are closed after the compartment is filled. Valve 9 of the last compartment 5 is always open and therefore the level of the solution in the last compartment may fluctuate, while in the remaining, sealed compartments it does not change. The mud from the last compartment is sucked off by the drilling pumps through the pipe 3. The bottom of the tank is double-pitched and ends with a chute - keel 10. In the keel of each part of the compartment are inserted the ends of the auxiliary discharge lines 11 from the mud pumps sucking the solution from the last compartment of the same tank. The tank is installed on runners x 12 with brackets 13. The wellhead (not shown) and the tank are 2 vessels connecting by the inlet, so the solution level in the tank rises to the same height as the wellhead wellhead.

When the tank is filled, the liquid enters it through the pipe 2 and fills the first part of the first compartment. The valve 9 in its upper part is open. Flocjre, when the level of the solution in the first part of the first compartment rises to the opening of the water seal 8, the second part of the compartment begins to fill through the partition 7. The level in the compartment rises until it rises to the opening of the water seal 6 through the partition 3. Thereafter, the solution enters the first part of the second compartment and the process continues in the same order. In order not to lower the level in the first filled compartment, it is sufficient to close the valve 9 in its upper part. When the second compartment is filled in the first compartment, the drilling fluid enters the bottom of the first part and goes up through the partition 7, since the resistance to movement will be less than when moving through the hydraulic lock 8. In the second part of the compartment, the solution moves down to the lower opening of the hydraulic seal Biting the seal through the partition 4 of the compartment, the solution moves up and then down. Similar to

motion picture in all compartments. Thus, with any movement of the solution, the entire volume of it in the tank is set in motion. When this precipitate falling out of the mud stream settles on the sloping

the bottom of the tank and accumulates in the keel. The sediment is under some pressure from the upstream of the drilling mud. If you open a manhole hole (not shown) located on the keel, the sediment rushes into this hole without any additional effort, regardless of whether the drilling fluid is circulating in the upper part of the tank or not. The produced sludge can be sent to the mixing ejector funnel and from it back to the circulating system. A hole in the auxiliary injection line 11 is used to soak the sediment. The drilling fluid pumped through the keel of the reservoir draws in and captures the particles of the desired iron.

The supply of partitions 7 and 4 with hydraulic locks allows for the reverse movement of the solutions (for example, during topping-up) until the tank is completely empty.

The presence of baffles 7 in each m compartment makes it possible to eliminate stagnant zones of drilling mud and hem the most to improve the quality of its mixing.

Claims (2)

1. USSR author's certificate number 193397, cl. E 21 B 21/06, 1962. 2. USSR author's certificate No. 564405, cl. E 21 V 21/06, 1975 (proto-n).  7 7. . GC f2 TW / Jl