RU23456U1 - DRILLING RIG CLEANING CIRCULATION SYSTEM - Google Patents

Description

Mud Cleaning Circulation System

The utility model relates to the mining industry, in particular to equipment for drilling oil and gas wells.

Known circulating system, including receiving tanks in communication with the supply and compensation tank, treatment equipment and pumps.

The liquid level necessary to create pressure in the suction manifold of the mud pump is created by performing a flow-compensating riser in the form of a gas separation hydrocyclone (see USSR author's certificate No. 1635630, class E 21 B 21/06, 04/06/89).

A disadvantage of the known system is the relatively low reliability, due to the fact that in the event of a sudden stop of the hydrocyclone due to its small volume, the drilling fluid is quickly pumped out, which leads to "drainage (failure of supply) of the pumps and their failure.

From the copyright certificate of the USSR No. 1765353, cl. E 21 In 21/06, 04/11/90, a circulation system is known that contains a receiving tank and is in communication with it, a flow-compensating tank (“riser)” of a higher height, connected to a mud pump and equipped with a drain pipe.

The drain pipe is installed along the axis of the flow-compensation tank, its upper end does not reach its top, and the lower end is withdrawn from it and connected to the receiving tank.

The system includes treatment equipment: a vibrating screen installed above the receiving tank, and a hydrocyclone-sand separator connected to the outlet pipe of the slurry pump and to the flow-compensating tank. To maintain the level of the solution in the latter, the system is equipped with a low-pressure unit and a valve system. The suction pipe of the unit is connected to the collector, and the discharge pipe is connected to a flow-compensation tank.

This technical solution is the closest to the proposed set of features and is taken as a prototype.

A disadvantage of the known circulating system is its low reliability due to the complexity of the design of the system for maintaining and restoring the level in the flow-compensating capacity, which leads to failure of the mud pump in cases of failure.

The known system does not provide for the maintenance in the receiving tank of a stable liquid level necessary to prevent a disruption in the supply of the slurry pump and its stable operation.

The technical task of the utility model is to increase the reliability of the circulation system by simplifying its design and ensuring the maintenance of a stable level of solution in the receiving and flow-compensating containers.

2002100834

-: shimsaim

OOJ 1 008U

ЕВВ 21/06

in the proposed utility model containing a receiving tank and a flow-compensating tank connected with it in height, connected to a mud pump and equipped with a drain pipe; cleaning equipment, including a vibrating screen and a hydrocyclone-sand separator, connected to the outlet pipe of the slurry pump and to a flow-compensating tank, the task is achieved by the fact that the receiving tank with the help of a vertical overflow partition is divided into two compartments, one of which has a vibrating screen, and the other is connected to the receiving pipe of the slurry pump; one end of the drain pipe is installed on the side wall of the flow compensation tank above the maximum fill level of the receiving tank, the other is placed in the receiving tank at the level of the upper edge of the vertical overflow baffle and is equipped with a float valve, and the end of the pipeline connecting the hydrocyclone to the flow compensation tank, placed above the level of its maximum filling, while the volume of the flow-compensation tank is not less than the volume of drilling fluid displaced by the drilling tool nd when running at full depth of the well.

Thanks to the new features of the circulation system, it is possible to form a reserve of drilling fluid in a flow-compensating tank and to transfer it to a receiving tank at the right time, regardless of the operator. This ensures the maintenance of a stable set level of the solution in the receiving tank and the stable operation of the pumps.

The proposed circulation system is illustrated in the drawing.

The system includes a receiving tank 1 and a large flow-compensating tank 2 connected with it, connected to a mud pump 3.

The receiving tank 1 using a vertical overflow partition 4 is divided into two compartments - A and B.

The circulating system includes treatment equipment: a vibrating screen 5 mounted above compartment A of the receiving tank 1, and a gyrocyclone-sand gidgel 6.

The latter is connected via pipeline 7 to the outlet pipe of the slurry pump 8, the receiving pipe of which is connected via pipe 9 to the compartment B of the receiving tank 1.

The hydrocyclone-sand separator 6 is connected to the flow-compensating tank 2 using a pipeline 10, the end of which is placed above the level of its maximum filling.

The expansion joint tank 2 is equipped with a drain pipe 11, one end of which is installed on its side wall above the level of maximum filling of the receiving tank, and the other is located in the latter at the level of the upper edge of the vertical overflow partition 4 and is equipped with a float valve 12.

The drilling fluid flows from the funnel at the wellhead through an inclined trough (not shown) to the vibrating screen 5 and after rough cleaning it is drained into compartment A of the receiving tank 1. Here, the largest fractions of the remaining sludge are sedimented and sedimented, after which the solution passes through the overflow baffle 4 flows into compartment B, from where it is taken up by a slurry pump 8 and fed into a hydrocyclone-sand separator 6 for finer cleaning. From the hydrocyclone 6, the cleaned drilling fluid is discharged through pipeline 10 into a flow-compensating tank 2, from where it is fed to the mud pump 3 and then into the well using a booster pump.

Since the supply-compensation tank is filled in height more than the receiving tank 1, it will always have a supply of solution sufficient to maintain the level in the system.

The performance of the slurry pump 8 exceeds the performance of the mud pump 3, which is a prerequisite for the stable operation of the circulation system. The excess solution resulting from the difference in the performance of pumps 3 and 7 is accumulated in the flow-compensating tank 2 and out of it through the drain pipe 11, as needed, flows into the compartment B of the receiving tank 1. The size of the overflow of the solution is regulated by the float valve, ensuring constant filling capacity 1 at a given level.

The economic effect of the proposed circulation system is obtained by increasing its reliability and simplifying the design.

The system compensates for the entrainment of drilling mud with sludge and ensures stable operation of the sludge pump without a disruption in supply at a relatively small height of the receiving tank. The arrangement of the circulation system proposed in the application with the receiving and expendable compensation tanks of different heights and volumes allows the system to be mounted on the platform of the trailer and thus create a mobile cleaning system, which is especially important for well overhauls.

Claims (1)

The circulation system of the drilling mud cleaning unit, comprising a receiving tank and a flow-compensating tank connected with it in height, connected to the mud pump and equipped with a drain pipe, cleaning equipment including a vibrating screen and a hydrocyclone-sand separator connected to the outlet pipe of the slurry pump and to a flow -compensating capacity, characterized in that the receiving capacity using a vertical overflow partition is divided into two compartments, one of which is installed vibrosieve o, and the receiving branch pipe of the slurry pump is connected to the other, one end of the drain pipe is installed on the side wall of the supply-compensation tank above the level of the maximum filling of the receiving tank, the other is placed in the receiving tank at the level of the upper edge of the vertical overflow partition and is equipped with a float valve, and the end of the pipeline connecting the hydrocyclone to the flow-compensating capacity is placed above the level of its maximum filling, while the volume of the flow-compensating capacity is not less than ema mud displaced by the drilling bit during the descent the designed depth of the well.