CN100424320C

CN100424320C - High-efficiency vacuum degasifier for gas-cutting drilling liquid

Info

Publication number: CN100424320C
Application number: CNB200610020343XA
Authority: CN
Inventors: 曾礼宾; 郑冲涛; 刘小玮; 羡维伟
Original assignee: Sichuan Petroleum Administration Bureau
Current assignee: Sichuan Petroleum Administration Bureau
Priority date: 2006-02-24
Filing date: 2006-02-24
Publication date: 2008-10-08
Anticipated expiration: 2026-02-24
Also published as: CN1837573A

Abstract

The present invention relates to a vacuum degasser for gas cut drilling fluid, which is used for the treatment of gas cut drilling fluid in conventional and under-balanced drilling engineering and belongs to the technical field of the manufacture of drilling liquid solid control equipment. The present invention is provided with a gas cut drilling fluid separation chamber, a fluid level control mechanism and a liquid intake and discharge control mechanism, wherein a step type separating plate is arranged in the gas cut drilling fluid separation chamber. For the problems that gas in high-density and high-viscosity drilling fluid can not be completely removed due to low rotating speed and low vacuum degree and the volume of air bubbles in the drilling fluid can be forced to rapidly expand and break by the stepped flow and high vacuum degree, the present invention designs a vacuum degasser for gas cut drilling fluid, which can treat drilling fluid of which the density range reaches 1.01 to 2.4 in a vacuum container.

Description

A kind of vacuum degasifier for gas-cutting drilling liquid

Technical field:

A kind of vacuum degasifier for gas-cutting drilling liquid, be used for conventional drilling and under balance pressure drilling engineering, handle underground natural gas and invade the gas cut drilling fluid that forms in the drilling fluid, and, belong to the manufacturing technology field of drilling fluid solid controlling corollary equipment and oil drilling well control device according to the requirement adjustment of special drillng operation and the density of control drilling fluid.

Background technology:

At present, it all is centrifugal vacuum degasser that the most of rigs of China offset a well matching used in the engineering, the operating principle of this centrifugal vacuum degasser is to utilize centrifugal field that gas cut drilling fluid is rotated in the separation chamber to carry out gas-liquid separation, according to document and our research and the actual proof of using, prior art is for gas cut drilling fluid, particularly to high density, full-bodied drilling fluid, because centrifuge speed is also too low, the reason that vacuum can not be controlled as required is so can't effectively separate the gas that invades in the drilling fluid.

The objective of the invention is defective at prior art, utilize the vacuum principle to force the gas bubbles volume in the gas cut drilling fluid to expand rapidly, break, design a kind of in vacuum tank, have separating plate and fluid level control device, and can the treated drilling fluid density range reach 1.01～2.4 vacuum degasifier for gas-cutting drilling liquid.

Summary of the invention:

The present invention includes drilling fluid separation chamber, a level controling mechanism and advance, the discharge opeing controlling organization, in the drilling fluid separation chamber, be provided with the staged separating plate that distributes by certain angle, separating plate is provided with air vent, to lower floor's separating plate conversion place the concave groove towards inlet is arranged one at the upper strata separating plate, be provided with a release mechanism that has spool and ball float in the lower end of drilling fluid separation chamber vacuum outlet; Level controling mechanism comprises spool, fulcrum, ball float and connecting rod, and fulcrum is that sealing is installed on the flanged plate, and flanged plate is fixed in the drilling fluid separation chamber; Advance, the discharge opeing controlling organization comprises the liquid inlet control valve and the discharge opeing control valve that is arranged on discharge opeing centrifugal pump rear end that are arranged between mud pit and the drilling fluid vacuum separation chamber; The drilling fluid separation chamber vacuumizes, gas cut drilling fluid is sent in the gas cut drilling fluid separation chamber under the effect of drilling fluid separation chamber inside and outside differential pressure automatically, gas cut drilling fluid is flowed through the staged separating plate when being formed thin layer, be clipped in bubble in the drilling fluid and can rise to the surface of drilling fluid, under the situation of negative pressure, the volume of bubble expands until breaking rapidly, reaches the purpose of gas-liquid separation; In order to improve separating effect, make the drilling well liquid measure that enters and discharge the gas cut drilling fluid deaerating chamber in a basic balance, be provided with level controling mechanism at horizontal deaerating chamber middle part, level controling mechanism is installed in the middle part of horizontal deaerating chamber by fulcrum, the installation of fulcrum is sealed by the O RunddichtringO, when liquid level changes in the deaerating chamber, ball float moves up and down with liquid level change, and the drivening rod mechanism action is when liquid level raises, ball float rises, admission valve is opened, and at this moment, the vacuum pump intake communicates with atmosphere, thereby the deaerating chamber internal pressure is raise, vacuum reduces, and the pressure reduction between deaerating chamber is inside and outside reduces, therefore, the drilling liquid flow prompt drop that enters in the deaerating chamber is low, and flow reduces; Otherwise when the liquid level reduction, ball float descends, and air valve is closed, and the deaerating chamber internal pressure reduces, and vacuum increases, and the mud flow rate that enters in the deaerating chamber increases; Pressure reduction between controlling inside and outside the deaerating chamber by the switch of automatic control of liquid mechanism is like this regulated the drilling well liquid measure that entering in the deaerating chamber automatically, reaches the in a basic balance of turnover liquid measure; For the gas cut mud amount and the treating capacity of the present invention that enter this vacuum deaerator from mud pit are balanced each other, liquid inlet control valve is arranged between mud pit and the drilling fluid separation chamber, the discharge opeing control valve is installed in the rear end of discharge opeing centrifugal pump, can control the inlet and the discharge rate of gas cut mud by the size of gauge tap degree.

Advantage of the present invention and beneficial effect are: because in drillng operation, the density of drilling fluid and viscosity are base area stressor layers and designing, and the density of various drilling fluids and viscosity required working vacuum degree when gas-liquid separation also is different, the vacuum control valve that is provided with on the level controling mechanism of the present invention can be according to the density of different drilling fluids and the vacuum of viscosity selection deaerating chamber, can reach good degassing effect, it is in a basic balance that the liquid inlet control valve of She Zhiing can make the drilling fluid treating capacity of the gas cut mud amount that enters vacuum degasser and vacuum degasser in addition, a pump output control valve is installed on the drain pipe of vacuum gas cut mud deaerator, can controls the output of processed back mud easily.

Description of drawings:

Fig. 1 is an assembling schematic diagram of the present invention.

Fig. 2 is the structure for amplifying schematic diagram of level controling mechanism of the present invention.

The specific embodiment:

Provide embodiments of the invention below in conjunction with accompanying drawing: the present invention includes horizontal drilling fluid separation chamber 4, a level controling mechanism and advance, the discharge opeing controlling organization, in drilling fluid separation chamber 4, be provided with twice sideling and the separating plate of descend arranging by ladder 5, the upper strata separating plate is provided with air vent 3, to lower floor's separating plate conversion place the concave groove 6 towards inlet is arranged one at the upper strata separating plate, be provided with a release mechanism 7 in the lower end of drilling fluid separation chamber 4 vacuum outlets, release mechanism 7 is made of spool and ball float; Middle part in drilling fluid separation chamber 4, be provided with level controling mechanism, level controling mechanism comprises spool 8, fulcrum 20, ball float 18 and connecting rod 19, level controling mechanism is installed in the middle part of drilling fluid separation chamber 4 by fulcrum 20, fulcrum is that sealing is installed on the flanged plate, and then is installed in the drilling fluid separation chamber 4 with flanged plate; Advance, the discharge opeing controlling organization comprises the liquid inlet control valve 1 and the discharge opeing control valve 14 that is arranged on discharge opeing centrifugal pump 15 rear ends that are arranged between mud pit 17 and the drilling fluid separation chamber 4; When the liquid that carries out gas cut drilling fluid is handled, close feed liquor valve 1 earlier, start vacuum pump 10, this time, owing to do not have liquid in the drilling fluid separation chamber 4, ball float is downward, so, the spool 8 of level controling mechanism is closed, be arranged on the spool of release mechanism 7 because ball float does not have buoyancy to open yet, under the effect of vacuum pump, air in the drilling fluid separation chamber 4 are evacuated and form vacuum state, after meeting the requirements of vacuum, open feed liquor valve 1, gas cut drilling fluid in the mud pit 17 is sent in the drilling fluid separation chamber 4 automatically through pipeline 2 under the effect of drilling fluid separation chamber 4 inside and outside differential pressures, the two-layer staged separating plate 5 that flows through setting after gas cut drilling fluid enters is formed thin layer, be clipped in bubble in the drilling fluid can rise to drilling fluid table and, under the situation of negative pressure, the volume of bubble expands rapidly until breaking, drilling fluid after the degasification drops to the bottom of drilling fluid separation chamber 4, the gas of separating rises and is extracted out by vacuum pump, after being cleaned through the water in the pond 13 11, discharge from exhaust opening 12, in order to control the vacuum in the drilling fluid separation chamber 4, vacuum pump 10 is provided with a vacuum control valve 9 with the connecting line of drilling fluid separation chamber 4, regulates the switch degree of vacuum control valve, just can control the vacuum that needs, so just reach the purpose of gas-liquid separation; In order to improve separating effect, make the drilling well liquid measure that enters and discharge drilling fluid deaerating chamber 4 in a basic balance, when the liquid level in the drilling fluid separation chamber 4 changes, ball float 18 moves up and down with liquid level change, the drivening rod mechanism action, when liquid level raise, ball float 18 rose, under the drive of connecting rod 19, the admission valve of level controling mechanism is opened, and at this moment, the vacuum pump intake communicates with atmosphere, thereby drilling fluid separation chamber 4 internal pressures are raise, vacuum reduces, and the pressure reduction between drilling fluid separation chamber 4 is inside and outside reduces, therefore, the drilling liquid flow prompt drop that enters in the drilling fluid separation chamber 4 is low, and flow reduces; Otherwise when the liquid level reduction, ball float 18 descends, and under the drive of connecting rod 19, the admission valve of level controling mechanism is closed, and drilling fluid separation chamber 4 internal pressures reduce, and vacuum increases, and the mud flow rate that enter in the drilling fluid separation chamber 4 increase; Pressure reduction between controlling inside and outside the deaerating chamber by opening or closing of level controling mechanism is like this regulated the drilling well liquid measure that enters in the drilling fluid separation chamber 4 automatically, reaches the in a basic balance of turnover liquid measure; For the drilling fluid after the degasification is delivered to the down-hole, also be provided with drilling fluid discharge opeing centrifugal pump 15 in the lower end of drilling fluid separation chamber 4; Reference numeral 16 is gas cut drilling fluids.

Claims

1. vacuum degasifier for gas-cutting drilling liquid, the separation chamber constitutes by drilling fluid, its feature comprise drilling fluid vacuum separation chamber, level controling mechanism in: described drilling fluid separation chamber and advance, the discharge opeing controlling organization:

A, described drilling fluid are provided with separating plate in the separation chamber, separating plate is provided with air vent, be provided with concave groove at the upper strata separating plate one to lower floor's separating plate conversion place towards inlet, be provided with a release mechanism in the lower end of drilling fluid separation chamber vacuum outlet, release mechanism is made of spool and ball float;

B, described level controling mechanism comprise spool, and fulcrum, ball float and connecting rod, fulcrum are that sealing is installed on the flanged plate, and flanged plate is installed in the drilling fluid separation chamber;

C, describedly advance, the discharge opeing controlling organization comprises the liquid inlet control valve and the discharge opeing control valve that is arranged on discharge opeing centrifugal pump rear end that are arranged between mud pit and the drilling fluid vacuum separation chamber.

2. according to the described a kind of vacuum degasifier for gas-cutting drilling liquid of claim 1, it is characterized in that: the lower end in described drilling fluid separation chamber also is provided with the discharge opeing centrifugal pump.

3. a kind of vacuum degasifier for gas-cutting drilling liquid according to claim 1 is characterized in that: described separating plate is also pressed ladder decline sideling and is arranged.