CN201180507Y - Drilling fluid four-phase separator drainage mechanism - Google Patents

Abstract

A drainage mechanism for a four-phase separator for drilling fluid, which relates to the technical field of drilling fluid separation equipment manufacturing, including a frequency conversion motor, a sand pump and a frequency conversion cabinet, one end of the frequency conversion cabinet is connected to a liquid level sensor, and the other end is connected to a frequency conversion motor , the sand pumps are respectively arranged on both sides of the upper water pipe, and the outlet end of the sand pump is connected to the drain pipe. This utility model adopts the principle of frequency conversion control, and designs a drilling fluid four-phase separator drainage mechanism that is especially suitable for underbalanced drilling. It solves the problem in the prior art that when the drilling fluid flow rate in the wellbore increases or the drain pipe is blocked, the fluid will be discharged from the exhaust pipeline to cause ground pollution during drilling. The level height controls the liquid discharge, which has the characteristics of ensuring a constant liquid level in the separation chamber and has the characteristics of automatic liquid level control.

Description

Drilling fluid four-phase separator drainage mechanism

Technical field:

A drilling fluid four-phase separator drainage mechanism, suitable for oil conventional drilling and underbalanced drilling operations, the clean drilling fluid separated by the separator is discharged from the separator body, and returned to the drainage mechanism of the drilling fluid circulation system, involving a The technical field of drilling fluid separation equipment manufacturing.

Background technique:

In the prior art, in the drilling process, because the formation of the well is gradually deepening, different formations may produce different fluids, so the drilling fluid returned from the downhole all contains cuttings and debris drilled by the drill bit. Gas, oil and other substances mixed into the drilling fluid after drilling the gas layer and oil layer, in order to separate these substances produced downhole from the drilling fluid, liquid and gas separation technology is currently widely used in conventional drilling and underbalanced drilling operations , the current two-phase separation technology can only separate the liquid and gas phases in the drilling fluid, and when implementing the main supporting equipment of the new underbalanced drilling technology, there are the following main problems: the current liquid level control in the separator adopts "U"-shaped tube technology, the liquid is automatically discharged from the separator, and the liquid below the design height of the "U"-shaped tube remains in the separator to control the liquid level, but the drilling fluid flow rate from the wellbore during drilling When enlarged or the drain line is clogged, fluid can be drained from the exhaust line, causing ground contamination and preventing the unit from functioning properly.

Invention content:

The purpose of the utility model is to overcome and solve the deficiencies of the prior art, adopt the principle of frequency conversion control, and design a drilling fluid four-phase separator drainage mechanism which is especially suitable for underbalanced drilling.

The technical solution adopted to achieve the purpose of this utility model is: a drilling fluid four-phase separator drainage mechanism, including a liquid level frequency conversion control mechanism, which is characterized in that: the liquid level frequency conversion control mechanism includes a frequency conversion motor, a sand pump and Frequency conversion cabinet, one end of the frequency conversion cabinet is connected to the set liquid level sensor, and the other end is connected to the frequency conversion motor. There are two frequency conversion motors and two sand pumps. The sand pump is driven by the frequency conversion motor; the two sand pumps driven by the frequency conversion motor are set separately On both sides of the upper water pipe, the outlets of the two sand pumps are connected to the discharge pipe, and the discharge pipe is connected to the confluence tank of the shale shaker; during normal operation, the liquid level in the separation chamber is pre-designed and adjusted. When the height changes, the sensor will convert it into an electrical signal and transmit it to the frequency conversion control cabinet. The control cabinet will change the speed of the frequency conversion motor according to the received signal to control the discharge volume of the pump, and finally make the flow into and out of the separator Keeping relatively constant, the liquid level in the separation chamber is stable at the designed liquid level.

The beneficial effect of the utility model is that in conventional oil drilling or underbalanced special drilling operations, the set liquid level frequency conversion control mechanism can accurately understand the height of the liquid level in the separator through the liquid level sensor, and can follow the set liquid level height The liquid discharge is controlled, so it can ensure a constant liquid level in the separation chamber, and prevent the separated gas from returning to the drilling fluid through the liquid discharge pipe, which has the characteristics of automatic liquid level control.

Description of drawings:

Fig. 1 is the schematic diagram of enlarged structure of the utility model.

Detailed ways:

The utility model is further described below in conjunction with the accompanying drawings: the utility model includes a liquid level frequency conversion control mechanism, and the liquid level frequency conversion control mechanism is composed of a frequency conversion motor, a sand pump, and a frequency conversion cabinet. The frequency conversion motor is provided with two frequency conversion motors 7, 8, and two sand pumps 6, 9, and the sand pumps are driven by frequency conversion motors; On both sides, the outlets of the two sand pumps 6 and 9 are connected to the discharge pipe 3, and the discharge port 1 of the discharge pipe 3 is connected to the liquid inlet pipe of the mud tank. Ball valves 4 and 5 are respectively arranged between the pipe 3 and the two sand pumps 6 and 9; during normal operation, a constant liquid level should be maintained in the separation chamber of the separator to prevent the separated gas from returning to the drain through the drainage mechanism. In the drilling fluid, the designed liquid level automatic control mechanism adopts two sand pumps equipped with frequency conversion motors, and is controlled by the liquid level height control mechanism in the frequency conversion cabinet; when the liquid level of the separation chamber changes, set the The liquid level sensor on the top of the separator tank transmits the data of the liquid level change to the liquid level height control mechanism in the frequency conversion cabinet. When the liquid level height control mechanism receives the signal, it automatically adjusts the speed of the frequency conversion motor 8 and 7, thereby changing The infusion volume of sand pumps 6 and 9, in order to achieve the constant liquid level in the separation chamber, the liquid discharged from the separation chamber of the separator is transported to the mud tank through the liquid discharge pipe 3 and the liquid discharge port 1 for continuous drilling.

Claims (2)

1. A drainage mechanism for a four-phase separator for drilling fluid, including a liquid level frequency conversion control mechanism, characterized in that: the liquid level frequency conversion control mechanism includes a frequency conversion motor, a sand pump, and a frequency conversion cabinet, and one end of the frequency conversion cabinet is connected to the set liquid The position sensor is connected, and one end is connected to the variable frequency motor. 2. The drainage mechanism of the four-phase separator for drilling fluid according to claim 1, characterized in that: the sand pumps are respectively arranged on both sides of the upper water pipe, the outlet end of the sand pump is connected to the drain pipe, and the drain pipe is connected to The collecting tank of the shale shaker.

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