CN2720109Y - Well-drilling multi-stage flow-throttling device for high-pressure oil-gas well - Google Patents

Abstract

The utility model relates to a well-drilling multi-stage flow-throttling device for a high-pressure oil-gas well, which belongs to the technical field of manufacturing the control device of the pressure of the well in the high-pressure oil-gas well. The utility model alters the one level throttling arranged for the paralleled two wings or three wings of the existing throttling device; the well drilling multi-stage flow-throttling device which can be serially connected with the multi-stage throttling is designed. The utility model is composed of the throttling device with a left wing and a right wing; the right wing is composed of two-stage throttling point, comprising two serially connected throttling valves; the left wing is a three-stage throttling point, comprising three serially connected throttling valves; a pressure sensor and a pressure display are arranged among the throttling valves. Since the utility model adopts the right and left two-path three-stage throttling which are serially connected, respective usages of the single-stage throttling and the serially connected two-stage, three-stage throttling can be implemented through path selection. Simultaneously, if one throttling point appears invalid, the throttling points which appear invalid faults can be carried out emergency repair, simultaneously, other throttling points can continue working.

Description

High-pressure oil-gas well drilling well multi-level throttle device

Technical field: a kind of high-pressure oil-gas well drilling well multi-level throttle device, be used for control to oil gas well borehole pressure, be used for control equipment manufacturing technology field when belonging to oil, geology and mineral products industry probing high-pressure oil-gas well to borehole pressure.

Prior art: when prior art is opened oil-gas Layer at brill, to keep balance between drilling well fluid column static pressure and the formation fluid pressure, this balance such as destroyedly just may in drilling process, cause the accident, specifically have several like this: what head of liquid was higher than formation fluid pressure is called the overbalance drilling well, this technology may make loosely organized stratum that the crack takes place, cause drilling fluid to invade the crack and stop up the formation pore passage, severe contamination stratum even, the result might cause the output that reduces or do not have oil gas greatly of output; The drilling fluid column pressure is lower than the under balance pressure drilling that is called of strata pressure, its formation fluid can pour in pit shaft and form well kick, and well kick can reduce drilling fluid proportion, thereby reduces the drilling fluid column pressure, if state further develops, just might cause formation fluid to spray to ground and blowout takes place via well; In order to prevent the generation of blowout, open oil-gas Layer at brill, when controlling borehole fluid pressure, enforcement all to adopt throttling arrangement, as existing preventer or single-stage choke manifold; Existing blowout control equipment is installed in well head, it can close well head, but fluid can continue to flow into pit shaft and make the rising of pit shaft internal pressure behind the closing well, when generation gas went into to soak, the fluid that pours in the well can get more and more, and pit shaft just is difficult to control, at this moment just must adopt the drilling fluid after the throttle well killing device soaks gas in well, to replace, replace the new drilling fluid through change density of energy equilibrium strata pressure, pour in pit shaft to stop formation fluid, this operation is exactly the kill job in drilling engineering; This shows, in the kill job process, the ability and the reliability of back pressure in the control well of choke valve own, just become the key in the pressure control technology, the throttling technology that adopts has both wings configuration and three wings configuration at present, but the shortcoming of existing weaponry and equipment is its choke valve residing position in choke manifold all is in state in parallel, no matter so be that both wings configuration or three wings configuration all are the one-level throttlings, the choke valve of its each wing all faces the pressure of the high-pressure fluid that comes in the well, therefore, by existing weaponry and equipment, even adopt present state-of-the-art choke valve, all can't realize with the high-pressure fluid of 70-100MPa under the high pressure conditions after the choke valve throttling, reduce to the low pressure of the 1MPa that can enter eliminator.

The purpose of this utility model is the problem that is provided with at throttling in parallel in existing both wings or the three wings throttling equipment, adopt the plural serial stage throttling, design a kind of high-pressure oil-gas well drilling well multi-level throttle device of a plurality of different choke valves of in whole throttling arrangement, connecting the high pressure classification throttling in the well.

Summary of the invention: the utility model is whole throttling arrangement to be divided into left and right both wings be configured, right flank constitutes two throttle point of one, two two-stages by the choke valve of two series connection, left wing is made of three throttle point of three grades the choke valve of three series connection, two throttle point of right flank are made of surge choke valve and a manual throttle valve, between two choke valves, be provided with pressure sensor and pressure display table, between two throttle point, be connected with the flap type that surges; Left wing is by a fixed restrictive valve, surge choke valve and the series connection of manual throttle valve become three throttle point, between three choke valves, all be connected with pressure sensor and pressure display table, and three throttle point are separated by the flap type that surges, when pressure during less than 40MPa, fluid in the well just can enter eliminator by outlet through after the one-level throttle point of right flank, when pressure is between 40-70MPa, can start second throttle point of right flank, realize the two-stage throttling, pressure is reduced to behind the required pressure and enter eliminator by outlet, when borehole pressure during greater than 70MPa, be arranged on after the pressure sensor senses between the throttle point, can start three grades of throttling flow processs of left wing, high pressure is entered eliminator after classification is depressurized to required pressure on three throttle point of series connection by control device; After pressure was greater than 100MPa, it was device that pressure sensor is transferred to control with pressure information, and the valve that is provided with on the main channel in the middle of control device can be opened is automatically implemented the open flow operation; The utility model has the advantages that: because three grades of throttle point series connection are arranged on left and right sides two-way, therefore, can realize selectively using respectively the two-stage of single-stage throttling control and series connection, three grades of throttling controls by Path selection, simultaneously on three grades of all throttle point, if invalid situation appears in one of them throttle point, can close the valve between the throttle point, the throttle point of invalid failures appears in rush repair under the situation that other throttle point work on.

Description of drawings:

Fig. 1 is the utility model multi-level throttle Unit Installation schematic diagram.

The specific embodiment: provide embodiment of the present utility model below in conjunction with accompanying drawing, multi-level throttle described in the utility model is three nuclear one-stage throttling devices that are divided into left and right both wings, right flank constitutes first and second two-stage throttle point by the choke valve of two series connection, and left wing is that the choke valve of three series connection constitutes three grades of throttle point; In the two-stage throttle point of right flank series connection, first order choke pressure be well head pressure less than 40MPa, second level choke pressure is that well head pressure is from 40-70MPa; Three grades of choke pressures of left wing's polyphone are that well head pressure is greater than 70MPa; Three throttle point of left and right sides both wings series connection can be closed separately under the situation of closing or opening the valve between the throttle point, perhaps open separately; Right flank also can be that right flank constitutes three grades of throttle point by three choke valves of connecting by first and second throttle point that two choke valves of connecting constitute with three grades of throttle point that left wing is made of three choke valves of connecting, first and second two-stage throttle point that left wing is made of two choke valves of connecting; The front and back of each throttle point of three nuclear one-stage throttling devices of left and right sides both wings series connection all are provided with pressure sensor and pressure display table, the front and back of each throttle point of three nuclear one-stage throttling devices of left and right sides both wings series connection all are provided with flap type, in order to be applicable to different pressures, the oil of different output, gas, well, according to different well ' s conditions, set pressure sensor is connected with intelligence controlling device with pressure display unit before and after each throttle point, import the data of gathering into Based Intelligent Control that intelligence controlling device just can form multi-level throttle, can collect in the pit shaft very easily and the various data on the throttling arrangement; During work, when borehole pressure during less than 40MPa, fluid pressure in the well is recorded by pressure sensor 15, at this moment valve 16 is closed, and the choke valve 13 that surges that the fluid in the well can only pass through first throttle point is by the one-level throttling, and pressure is reduced to and is suitable for entering eliminator, fluid is through the pressure sensor 11 of surge flap type 12 and back, pass through valve 6 and pressure sensor 5 again, to eliminator, also can arrange to eliminator by valve 8 by valve 4 rows; Pressure in well is greater than 40MPa, when being lower than 70MPa, pressure sensor 15 and 11 can sense, and signal is transferred to intelligence controlling device, intelligence controlling device is opened surge flap type 10 and 7, and by manually opening manual throttle valve 9, valve-off 6, like this, after the fluid of high pressure comes out in the well, via sensor 15, the choke valve 13 that surges of first throttle point of process is by the one-level throttling to the right, pressure is reduced to below the 40MPa, again through surging flap type 12, the pressure sensor 11 and the flap type 10 that surges enter the manual throttle valve 9 of two-step throttle point, and pressure is reduced to the pressure that is suitable for entering eliminator after by two-step throttle, and flap type 7 is arranged to eliminator through sensor 5 and valve 4 left through surging; When the pressure of borehole fluid during greater than 70MPa, sensor 15,11 and 5 variations that all can feel pressure, and information passed to intelligence controlling device, at this moment intelligence controlling device will start three grades of throttling programs on left road, open the flap type 17 that surges on left road, while manual-lock valve 14, make the fluid that comes out in the well left through surging flap type 17, at fixed restrictive valve 18 places of thereafter first throttle point by a throttling, pressure is dropped to below the 70MPa, pass through sensor 19 then, at choke valve 20 places of surging of second throttle point by the throttling second time, pressure further is throttled into below the 40MPa, because the valve 1 and the flap type 3 that surges are normal closing, so fluid can only be via sensor 11, flap type 10 surges, in the throttling for the third time of manual throttle valve 9 places of the 3rd throttle point quilt, the pressure after the throttling is reduced to and is suitable for arranging behind the pressure of eliminator through the flap type 7 that surges, sensor 5 and valve 4 are discharged; In actual moving process, if throttling appearred in surge choke valve 13 or the manual throttle valve 9 of right wing when losing efficacy, also can valve-off 14, the choke valve 20 that surges that makes high-pressure fluid pass through the fixed restrictive valve 18 and the left side is left dammed by two-stage, and the sensor 5 and the valve 4 of process centre are discharged to the right by valve 1 in the back, enable three grades on left road dam the decompression process in, the choke valve that can lose efficacy to right wing at the scene changes the outfit, equally, when losing efficacy appears in the choke valve on left road, also can close Zuo Lu, start right wing and carry out throttling, and the choke valve that was lost efficacy in left road changes the outfit; When ability that the pressure in the well can bear greater than throttling arrangement, the main open flow passage in the middle of can opening, and carry out urgent kill-job or pressure release.

Claims (3)

1. high-pressure oil-gas well drilling well multi-level throttle device, comprise left and right both wings throttling arrangement, it is characterized in that: described right flank throttling arrangement is in series with two choke valves, is provided with pressure sensor, pressure meter between two choke valves, also is connected with flap type between two choke valves; Described left wing throttling arrangement is in series with three choke valves, is provided with pressure sensor, pressure meter between each choke valve, also is connected with flap type between each choke valve.

2. high-pressure oil-gas well drilling well multi-level throttle device according to claim 1, it is characterized in that: described right flank also can be that right flank constitutes three grades of throttle point by three choke valves of connecting by first and second throttle point that two choke valves of connecting constitute with three grades of throttle point that left wing is made of three choke valves of connecting, and left wing constitutes first and second two-stage throttle point by two choke valves of series connection.

3. high-pressure oil-gas well drilling well multi-level throttle device according to claim 1, it is characterized in that: described pressure sensor is connected with intelligence controlling device with pressure display table.