SU1562425A1 - Blowout preventer control system - Google Patents

Abstract

The invention relates to the oil industry and is intended for remote control of blowout equipment located at the bottom of the sea. The goal is to reduce energy and metal consumption. For this, the system containing the main 1 and additional 7 pneumohydroaccumulators (PHA), connected via valve 4 OR, and the valves 2, open 14, and control 13 of the preventer 3, is equipped with a multiplier (M) 10. The piston cavity 12 M 10 is connected through a return valve 11 with its rod end 9, and through the check valve 5 with the PHA 1. Through the check valve 8, the cavity 9 is connected to the PHA 7. Through the valves 5 and 11, the PHA 1 is charged and the cavity 9 is filled. PGA 7 and valve 4. The opening of the distributor 13 in the cavity 12 low pressure is created, and during piston stroke in PHA 7, high pressure. The valve 11 is closed, the outlet of the valve 4 OR is connected to the inlet of the distributor 14 of the open, the outlet of which is connected to the chamber 15 of the preventer 3. When the preventer 3 is opened through the valve 4, the fluid from the PHA 7 is fed into the chamber 15. The closure occurs from the distributor 2. 2 Il.

Description

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The invention relates to the oil and gas industry, namely to remote control systems for blowout equipment.

The purpose of the invention is to reduce energy and metal consumption.

FIG. Figure 1 shows the hydraulic control system; in fig. 2 - P-V PHA dilution diagram for control system operation.

The control system contains a low-pressure main PHA 1 (Fig. 1) connected by an inlet, for example, an on-off distributor 2, to close the preventer 3 and to one, for example, the right inlet of the valve OR 4 Through the non-return valve 5, the PHA 1 is connected to a low pressure source (not shown ) with the distributor 13. The outlet of the distributor 2 is connected to the chamber 6 of the shut-off of the preventer 3. The second (left) input of the OR 4 valve is connected to an additional PGA 7 high pressure, which is connected to the rod 9 of the multiplier 10 through the non-return valve 8 the cavity 9 of the multiplier 10 is connected to a low pressure source (not shown) through a check valve 11 and to the valve 5. The piston cavity 12 of the multiplier is connected to the outlet of the control valve 13. The inlet of control valve 13 is connected via check valves 5 and 11 with PHA 1 directly to a low pressure source. The outlet of the OR 4 valve is connected to the inlet of, for example, a two-position distributor 14, opening the preventer 3, and the outlet of the distributor 14 is connected to the chamber 15 of the preventer 3 opening. The gas pressure of the PHA 7 is greater than the pressure in the PHA 1.

The control system operates as follows.

Initially, the PGA 1 is charged from the low pressure source through the check valves 5 and 11, filled with liquid and the rod cavity 9 of the multiplier 10, filled with the hydraulic valve to the PHA 7 through the check valve 8, and from the PHA 7 to the OR 4. The filling of the PHA 7 with liquid it does not occur, since it is locked by a gas charge pressure exceeding the system pressure.

Then, by opening the distributor 13, a low operating pressure is applied to the piston cavity 12 of the multiplier. During the course of the rod of the multiplier 10, a high pressure is supplied to the PGA 7, which is K times higher than the working pressure (where K is the multiplication coefficient). In this case, the check valve 11 differential pressure is closed. With the initial charged state of the PHA 7, the check valve 8 is closed, the right (first) input of the OR 4 valve is closed, and the output of the OR 4 valve is connected to the inlet of the distributor 14 of the preventer 3.

5 When opening the preventer 3, a control signal is supplied to the open distributor 14, which switches and supplies liquid from the high pressure PGA 7 through the left entrance

0 valve OR 4 into the chamber 15 to open the preventer 3. Since the well pressure prevents the opening of the preventer before the depressurization of the preventer seals, high pressure (high moving force) is required only until the depressurization. Further movement of the dies preventer does not require much effort. The operation of the control system when opening the preventer is explained by the P-V diaphragm (Fig. 2), i.e. a graph of pressure changes in the chamber of the opening of the preventer 3. High pressure from the PHA 7 produces

5 depressurization of preventer (curve 1, fig. 2). The pressure in PHA 7 drops from the maximum PM to the depressurization pressure Pn. At the same time, liquid volume is flowing out of PHA 7. The further opening of the preventer 3 takes place from PHA 7 until it is completely emptied. When the pressure in the PHA 7 drops to the final minimum pressure P IJK, equal to the pressure of the PHA 7 gas filling, it is cut off, for example, the hydraulic valve (not shown) closes and the pressure in the line drops. In doing so, the volume of

Q liquid lV, at the opening of the preventer. At the moment of the cut-off of the PHA 7 from the hydroline, there occurs a drop (sharp) in the pressure (section P c - P1Ah, in Fig. 2) and the OR 4 valve under

From the pressure differential created, it switches to another position, i.e. the right entry opens and the left closes. The further opening of the preventer 3 comes from PHA 1 (curve 2, fig. 2), and the volume of fluid displaced from the PHA 1 (when disconnected from a low pressure source) is DUr DU, where Vp "e is the volume of the preventer opening chamber. The pressure in PHA 1 falls from the maximum R. to the final P1K, and PHA 1 can be. only partially discharged. Parameters of PHA 1 and 7 are selected in such a way that the minimum pressure in high pressure PGA 7 when it is fully discharged always exceeds the maximum pressure in the main source of pressure — PGA 1, which is easily achieved by selecting the necessary pressure of filling gas with PGA 1 and 7.

Claims (1)

The closure of the preventer 3 occurs when a control signal is applied to the closure distributor 2, which switches and passes the liquid from the PGA 1 to the closure cavity 6. Claims 1 A preventer control system comprising a main and auxiliary hydraulic accumulators connected to the inputs of the OR valve, control valves, closing and opening of the preventer, the output of the latter of which is connected to the open chamber, characterized in that and metal, it is supplied Q multiplier, the rod cavity of which through the first non-return valve is connected to the output of the additional pneumohydraulic accumulator; i the piston cavity is connected to the output 5 the closing distributor is connected to the preventer closing chamber, and the OR valve outlet is connected to the opening of the distributor. Oh Urab. FIG. 2