CN200982178Y - Under balance drilling automatic throttle valve - Google Patents

Abstract

An under balance drilling automatic throttle valve which is used for the throttling of the choke manifold in the under balance drilling and belongs to producing technique of the under balance drilling throttle valve. The utility model comprises a pressure adjustment section and a throttling section, adopts the method of the fluid flowing in at the end of the valve rod and flowing out at the waist and solves the problems of large moment of the throttle valve switch and easy-washing of the valve. The amount of compression of the vale rod with respect to the spring and the openness of the valve are controlled by a limiting cover and a locking rod in the upper part of the valve, the compression range of the spring is controlled and determined by the limiting position of the valve rod and the locking rod, and thereby the wellhead back pressure can be limited to the demanded range and meet the demand of the under balance drilling technique, meanwhile the utility model can improve the adjusting accuracy and realize the automatic control of the wellhead back pressure fluctuation, and can be changed into manual throttle valve when necessary.

Description

The under balance pressure drilling automatic throttle

Technical field: a kind of under balance pressure drilling automatic throttle, be used for the throttling of petroleum gas under balance pressure drilling well head choke manifold, belong to the manufacturing technology field of the Special Automatic choke valve of petroleum gas under balance pressure drilling well head.

Background technology: in oil and gas exploration and development process, the throttle well killing manifold is to realize pressure controlled necessaries, and choke valve is the critical elements of choke manifold.The choke valve of installing on the domestic petroleum choke manifold mainly is the cartridge type choke valve at present, it is by manually or surge the opening degree of control valve, realize regulating the function of wellhead back pressure, for keeping wellhead back pressure to be stabilized in the certain value scope, must an ad hoc workman regulate choke valve, the shortcoming of prior art is: owing to be manual adjustment, can not realize automatic control, therefore degree of regulation is lower, causes the wellhead back pressure fluctuation big easily, and drilling technology is had considerable influence.

Summary of the invention: the purpose of this utility model is the shortcoming at prior art, adopt high speed, high-pressure fluid to flow into from the valve rod end, mode from the waist outflow, utilize the elastic force of spring to adjust the opening degree of choke valve automatically, design a kind of can be according to the under balance pressure drilling automatic throttle of valve inlet pressure size automatic Regulation.

The utility model is achieved in that the utility model comprises adjustment and throttling two parts, adjustment member is by valve rod, valve gap, spring, handwheel, the handwheel pressure cap, nut, check lock lever and position-limiting cover are formed, check lock lever is arranged on the upper end of position-limiting cover, position-limiting cover is arranged on the upper end of handwheel pressure cap, handwheel is fixed on hand wheel pole top by the handwheel pressure cap, both sides at position-limiting cover are provided with observation port, the upper end diameter of valve rod is little, and be provided with screw thread and nut, the lower end diameter of valve rod is greater than the diameter of upper end, valve rod passes spring pad, spring and hand wheel pole, top is fixed by nut, the hand wheel pole knob is by the upper surface of valve gap, and the lower end of valve gap is connected with valve body by bolt; The throttling part is made up of valve body, fluid intake, fluid issuing, and fluid intake vertically is arranged on the lower end of valve body, and the outlet of fluid is horizontally installed on the waist of valve body; During assembling, spring pad is enclosed within on the valve rod, be enclosed within spring on the valve rod from top to bottom then, from top to bottom hand wheel pole is enclosed within the upper end of valve rod again, screw in valve rod upper end then nut with spring compression between spring pad and hand wheel pole lower end, then with the valve rod that installs, upwards be installed on the valve gap from the lower cover mouth of valve gap to upper knob, lower end with valve gap is connected with valve body then, again with the upper end of handwheel sleeve at hand wheel pole, and handwheel is fixed by the handwheel pressure cap, again with the position-limiting cover knob on the handwheel pressure cap, the check lock lever that will be arranged on the limited cap upper surface is at last adjusted to the assembling that this under balance pressure drilling automatic throttle has just been finished in the position that needs; During use,, rotate the compressive force of handwheel setting spring, just the under balance pressure drilling automatic throttle can be come into operation according to design; In the process of making a trip, if the pressure of down-hole greater than length of spring compressed power, the pressure oscillation meeting promotes spring upwards, moves up in the pressure limit inner valve stem of setting, the passage that flows will become big; When the pressure of down-hole hour, spring recovers the lower limit set downwards, flow channel can recover again, realizes the automatic control of downhole fluid and the automatic control of wellhead back pressure with this; During fixing if desired choke pressure, check lock lever is pressed closer downwards on valve rod, the spring of setting just can not stretch with the variation of down-hole pressure, so can realize the throttling of fixation pressure.

Of the present utility model a bit and beneficial effect be: the utility model has structurally changed common choke valve fluid inflow mode, adopt high speed, high-pressure fluid to flow into from the valve rod end, flow out from waist, solve the problem that the big and valve of throttle switch moment easily washes away fracture damage, improved application life; Valve top adopts position-limiting cover and check lock lever to limit the decrement of the relative valve rod of spring, and having peep hole at position-limiting cover, the length of spring compressed situation is determined in the qualification position of considerable side valve bar and check lock lever, wellhead back pressure is limited in the scope that needs, reaches the requirement of under balance pressure drilling well control technology.

Description of drawings:

Fig. 1 is an assembly structure schematic diagram of the present utility model.

The specific embodiment: provide embodiment of the present utility model below in conjunction with accompanying drawing: the utility model comprises pressure adjustment member and throttling part, adjustment member is by valve rod 12, valve gap 7, spring 9, check lock lever 3, handwheel 6, handwheel pressure cap 5, nut 4 and position-limiting cover 1 are formed, check lock lever 3 vertically is arranged on the upper end of position-limiting cover 1, position-limiting cover 1 is by the top of screwed connection at handwheel pressure cap 5, handwheel 6 is arranged on hand wheel pole 8 tops, be fixed on the top of hand wheel pole 8 by handwheel pressure cap 5, be provided with observation port 2 on the both sides of position-limiting cover 1, the upper end of valve rod 12 is provided with screw thread and nut 4, the diameter of valve rod 12 lower ends is greater than the diameter of upper end, the bottom surface of valve rod 12 lower ends is a ramp structure, the lower end of spring 9 is spring pads 11, the upper end is a hand wheel pole 8, spring 9 is arranged between spring pad 11 and the hand wheel pole 8, valve rod 12 passes spring pad 11, spring 9 and hand wheel pole 8, top is fixing by nut 4, the cylindrical of hand wheel pole 8 is provided with screw thread, knob is in the upper surface of valve gap 7, and the lower end of valve gap 7 is connected with valve body 14 by bolt 10; The throttling part is made up of valve body 14, fluid intake 15, fluid issuing 13, and fluid intake 15 vertically is arranged on the lower end of valve body 14, forms fluid tip and flows into, and the outlet 13 of fluid is horizontally installed on the waist of valve body 14, forms the fluid waist and flows out; During assembling, spring pad 11 is enclosed within on the valve rod 12 from top to bottom, the endoporus of spring pad 11 is less than the diameter of valve rod 12 lower ends, so just can only drop on large diameter upper surface, valve rod 12 lower ends on the valve rod 12 when spring pad 11 is enclosed within, then spring 9 is enclosed within on the valve rod 12 from top to bottom, the lower end of spring 9 is stopped by spring pad 11 can not continue to fall, from top to bottom hand wheel pole 8 is enclosed within the upper end of valve rod 12 again, the position that has screw thread then in the valve rod 12 upper ends nut 4 of screwing on is pressed on spring 9 between spring pad 11 and the hand wheel pole 8, the valve rod 12 that will install spring 9 and hand wheel pole 8 then upwards upwards is installed in the valve gap 7 by the screw thread knob that is arranged on valve gap 7 upper surfaces from the lower cover mouth of valve gap 7, lower end with valve gap 7 is connected with valve body 14 then, again handwheel 6 is enclosed within from the top down the upper end of hand wheel pole 8, with handwheel pressure cap 5 knobs on the screw thread of the upper end of hand wheel pole 8, handwheel 6 is fixed, again with position-limiting cover 1 knob on the screw thread of handwheel pressure cap 5 cylindricals, will be screwed in check lock lever 3 in the limited cap 1 upper surface screw thread at last and adjust to the assembling that this under balance pressure drilling automatic throttle has just been finished in the position that needs; During use, pressure limit according to design, rotate the compressive force of handwheel 6 setting springs 9, just the under balance pressure drilling automatic throttle can be come into operation, in the process of construction that makes a trip, the pressure oscillation meeting greater than spring 9 compressive forcees that the down-hole upwards is applied to valve rod 12 lower ends promotes spring 9 upwards, at this moment, because valve rod 12 moves up, therefore the passage that flows will become greatly, so can not cause valve rod 12 lower surfaces and too big wash away and rupture, the pressure that upwards is applied to valve rod 12 lower ends when the down-hole hour, spring 9 recovers the lower limit of setting downwards, and flow channel can recover again, realizes the automatic control of downhole fluid and the automatic control of wellhead back pressure with this; If desired during a fixing choke pressure, press closer top downwards with being arranged on check lock lever 3 in the limited cap 1 upper end screw thread in valve rod 12 upper ends, in removing the process of dress, spring 9 just can not stretch with the variation of down-hole pressure, therefore can realize the fixed pressure throttling, when adjusting check lock lever 3, can be by the qualification position of observation port 2 observation check lock levers 3; When needing fully manually to control, rotatable handwheel 6, spring 9 is compressed fully, and the lower end of check lock lever 3 is fixed on the end face of valve rod 12 upper ends spring 9 and valve rod 12 can not be moved up and down with the variation of pressure, so just the utility model can be converted to and rely on the manual control of rotating handwheel 6 fully, reach the purpose that realizes the common manual choke valve.

Claims (4)

1, a kind of under balance pressure drilling automatic throttle comprises adjustment member and throttling part, it is characterized in that:

A, described adjustment member comprise valve rod, valve gap, spring, check lock lever, handwheel, handwheel pressure cap, nut and position-limiting cover, check lock lever vertically is arranged on the upper end of position-limiting cover, position-limiting cover is by the top of screwed connection at the handwheel pressure cap, handwheel is arranged on the top of hand wheel pole, the upper end of valve rod is provided with screw thread and nut, spring is arranged between spring pad and the hand wheel pole, and the cylindrical of hand wheel pole is provided with screw thread, and the lower end of valve gap is connected with valve body by bolt;

B, throttling part are made up of valve body, fluid intake and fluid issuing, and fluid intake vertically is arranged on the lower end of valve body, and the outlet of fluid is horizontally installed on the waist of valve body.

2, under balance pressure drilling automatic throttle according to claim 1 is characterized in that: described handwheel is fixed on the top of hand wheel pole by the handwheel pressure cap.

3, under balance pressure drilling automatic throttle according to claim 1, it is characterized in that: the both sides of described position-limiting cover are provided with observation port.

4, under balance pressure drilling automatic throttle according to claim 1 is characterized in that: the diameter of described valve rod lower end is greater than the diameter of upper end, and the bottom surface of valve rod lower end is a ramp structure.

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