AU2009354568A1 - Multi-level refined throttle manifold and automatic control system - Google Patents

Multi-level refined throttle manifold and automatic control system Download PDF

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Publication number
AU2009354568A1
AU2009354568A1 AU2009354568A AU2009354568A AU2009354568A1 AU 2009354568 A1 AU2009354568 A1 AU 2009354568A1 AU 2009354568 A AU2009354568 A AU 2009354568A AU 2009354568 A AU2009354568 A AU 2009354568A AU 2009354568 A1 AU2009354568 A1 AU 2009354568A1
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AU
Australia
Prior art keywords
choke
pressure
drop
manifold
automatic control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
AU2009354568A
Inventor
Jun Li
Gonghui Liu
Zhongxi Zhu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Petroleum Beijing
Beijing Union University
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China University of Petroleum Beijing
Beijing Union University
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Publication date
Application filed by China University of Petroleum Beijing, Beijing Union University filed Critical China University of Petroleum Beijing
Publication of AU2009354568A1 publication Critical patent/AU2009354568A1/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B34/00Valve arrangements for boreholes or wells
    • E21B34/02Valve arrangements for boreholes or wells in well heads
    • E21B34/025Chokes or valves in wellheads and sub-sea wellheads for variably regulating fluid flow

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Pressure (AREA)
  • Flow Control (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

A multi-level refined throttle manifold and an automatic control system are provided. The multi-level refined throttle manifold system is composed of multiple plate valves and a throttle valve that are connected in parallel. The automatic control system enables micro-adjustment of wellhead return pressure under different pressure grades through starting and closing the different plate valves, and through adjusting the throttle valves continuously. Automatic control system implements bumpless switching for the process of adjusting opening degree of the valves in order to make the process of adjusting wellhead return pressure fast and smooth.

Description

Multi-level precise choke manifold and automatic control system Technical Field The present invention refers to an automatic control of the oil-gas exploration and development, especially refers to a precise automatic control system on choke pressure in the oil-gas well drilling. Background of the Invention In engineering of the oil-gas exploration and development, with the broadening of the field of the oil-gas exploration and the technological advances, the requirements of control technology on wellhead back pressure have been greatly increased during the drilling course. On one hand, using methods of near or under balance pressure drilling can protect the reservoir, effectively reduce the damage of drilling fluids to the reservoir, reduce or overcome the effect of pressure difference on drilling rate, effectively reduce the composite cost of developing oil-gas well, greatly increase the rate of mechanical penetration and the success probability about oil-gas well drilling; on the other hand, when drilling the formation in which the mud density window is very narrow or even near zero, in order to ensure successful drilling it must be required that the equivalent circulating density of wellbore annulus should be keep constant during the entire process of drilling. In the drilling process it must be guaranteed that whether the normal-drilling or the connection and the trip-drilling, the wellhead back pressure can be adjusted in tune to the construction requirement smoothly and quickly and keep steady. However, the existing choke manifold systems of the pressure well all use the structure form in which multiple valves are in series connection. During choke control, this structure form must request that the back flow of drilling fluid passes through all the valves and the choke pressure is controled by controlling the opening degree of choke valve. But the linear regulation region is very narrow because the adjustment accuracy and intensity of the choke valve appear serious non-linear character in relative opening degree range (0-100%), so that it is difficult to control the adjust accuracy of the choke valve under large flow conditions and large flow can make serious erosion to the choke valve, which makes the choke valve easily broken. down. Summary of the Invention The object of present invention is to provide a choke control system which can adjust wellhead back pressure in the range of different pressure control level precisely and proceed undisturbed switch between different pressure level, thereby during the whole process of drilling at various operating conditions, the equivalent circulating density of drilling fluids in the wellbore annulus can be kept constant, and the safe drilling under the formation condition of a narrow pressure window becomes possible. In order to achieve above objects, the present invention provides one kind of multi-level precise choke manifold and automatic control system, which includes a set of ground choke manifold system and automatic control system, wherein three plate valves and one choke valve form the choke manifold system through parallel connection. The said multi-level precise choke manifold and automatic control system consists of a pressure sensor used to measure inlet pressure of choke manifold, 3 a displacement sensor used to measure the opening degree of choke valve, a flow meter used to measure the outlet flow of choke valve, sensors used to determine switch state of each plate valve, a device used to filter-amplified various signals and A/D conversion, a device which transmits signals after filter-amplified and A/D conversion to a cabinet and an engineer station, a device used to save and display data, and an automatic control device. The automatic control device calculate and issue control instructions according to current operating state of pipeline and back-pressure pump, proceed the action and speed operation to the switch of plate valve and the opening degree of choke valve based on the steps of choke control process at all levels, thus realize wellhead choke back-pressure. Preferably, said device used to save and display data employs standard industrial control computer, in which the data bus is connected with the controller, a perfect computer monitoring interface is programmed in a host computer, all parameters can be displayed in host computer so that operators can control the whole control-pressure drilling device through monitoring interface. Preferably, said automatic control device employs standard control cabinet in which electrical elements including a controller module, a bus module, an 1/0 module, a relay, a safety barrier, an isolated barrier, a ground tenninal array etc are installed, the electrical elements mainly realize functions of setting power distribution in the control system,. signals importation, exportation and isolation, and so on. In the operation of present system, according to the requirement of different pressure control level and precision, the system determines and chooses the switch state of each plate valve corresponding to certain pressure control level, then 4 precisely adjust required value of wellhead back pressure by controlling the opening degree size of choke valve corresponding to certain choke flow channel, which results in that the precision of controlling wellhead back pressure is greatly increased. In the operation of present system, precise adjustment can be realized at every level of choke pressure control, thus avoiding the disadvantages that the most optimal segment of precise control in the previous choke manifold system is narrow. The controlling range of the wellhead back pressure is greatly improved. Through automatic control, the present system can realize function of undisturbed automatic switch during the operation process of each choke level, ensure the choke control pressure transittion to each range of control level safely and smoothly.. Description of the Drawings Figure 1 is the design drawing of one preferred embodiment of multi-level precise choke manifold system according to the present invention in which figure 1A is a plan view,. figure 1B is a side view and figure 1 C is a top view. Figure 2 is the schematic diagram of one. preferred embodiment of multi-level precise choke manifold system and automatic control system according to the present invention. Figure 3 is the schematic diagram of one embodiment of each pressure level flow channel in the multi-level precise choke manifold system and automatic control system according to the present invention. Figure 4 is the illustrated drawing of one embodiment of each. pressure regulation interval in the multi-level precise choke manifold system and automatic control system according to the present invention.
5 Figure 5 is the data collecting and automatic control flow chart in one embodiment of the multi-level precise choke manifold system and automatic control system according to the present invention. Detailed Description of the Embodiments Figure 1 shows a ground multi-level precise choke manifold system in one preferred embodiment of a multi-level precise choke manifold and automatic control system according to the present invention, in which I is an outlet gate valve of drilling fluids back from wellhead; 2 is an inlet gate valve of the choke. manifold; 3 is an outlet gate valve of the choke manifold; 4, 5 and 6 are three plate valves for different pressure level adjustment which connect to choke manifold system in parallel; J is a choke valve used to precisely adjust. under different pressure level conditions; 7 is a gate valve of relief line; 8 is an outlet gate valve of relief line. Figure 2 shows a preferred embodiment of automatic control system in the multi-level precise choke manifold and automatic control system according to the present invention. The system is three layers hierarchical control structure which is divided into measuring and controlling device of bottom layer, controller of middle layer and computer control of top layer. Refer to figure 3 and figure 4. the specific steps to realize progressively choke operation in pressure control level are: First control pressure level: point D J 41 the lower limit A P of the pressure-drop adjustment of the choke manifold, the choke back pressure is P 0 + OP Second control pressure level: closing the choke valve gradually from point M Jj45efn make the choke pressure-drop of the choke manifold rise to point @J 4 5 now the choke pressure-drop can reach to 2 AP the adjustment of pressure-drop during this period is AP but the back pressure produced by choke rises from P 0 + AP to P 0 + 2 AP ; Third control pressure level: closing the choke valve gradually from point Hc5n make the choke pressure-drop of the choke manifold rise to point @J now the choke pressure-drop can reach to 3 AU the adjustment of pressure-drop during this period is ZP but the back pressure produced by choke rises from P 0 + 2 tWP P 0 + 3 AP Fourth control pressure level: closing the choke valve gradually from point 1 4c an make the choke pressure-drop of the choke manifold rise to point RJ, now the choke pressure-drop can reach to 4 AU the adjustment of pressure-drop during this period is AP but the back pressure produced by choke rises from P 0 + 3 t&P P 0 + 4 AP ; Fifth control pressure level: closing the choke valve gradually from point 4 J can make the choke pressure-drop of the choke manifold rise to point ]) and shut-in casing pressure. It can be intuitively understood that P Ois defined as the real pressure of downstream outlet of the choke manifold. It can be known from analysis that point J45sfiegarded as the lower limit of the choke, and it is one step of gradually increase pressure AP = AP J 4 5 6 Figure 5 shows the data collecting and automatic control flow chart in preferred embodiment of the multi-level precise choke manifold and automatic control system according to the present invention.

Claims (5)

1. A multi-level precise choke manifold and automatic control system, which includes a set of ground choke manifold and automatic control system, wherein the choke manifold includes plate valves (4) (5) (6) and a choke valve (J) connected in parallel, said system consists of a pressure sensor used to measure the inlet pressure of the choke manifold, a displacement. sensor used to measure the opening degree of the choke valve, a flow meter used to measure the outlet flow of the choke valve, sensors used to determine switch state of each plate valve, and a device used to filter-amplified various signals and A/D conversion, a device which transmits signals after filter-amplified and A/D conversion to a cabinet and an engineer station, a device used to save and display data, and an automatic control device, the automatic control device calculate and issue control instructions according to current operating state of pipeline and back-pressure pump, proceed the action and speed operation to the switch of plate valve and the opening degree of choke valve based on the steps of choke control process at all levels.
2. The multi-level precise choke manifold and automatic control system according to claim 1, wherein said device used to save and display data employs standard industrial control computer, in which the data bus is connected with the controller, a perfect computer monitoring interface is programmed in a host. computer, all parameters can be: displayed in the host computer so that operators can control the whole control-pressure drilling device through monitoring interface.
3. The multi-level precise choke manifold and automatic control system according to claim 1 or claim 2, wherein said automatic control device employs standard control cabinet in which electrical elements including a controller module, a bus module, an 1/0 module, relay, a safety barrier, an isolated barrier, a ground terminal array etc are installed.
4. A method to specifically realize progressively choke operation in pressure control level operation of the system according to any one of claims 1 to 3, includes following steps: First control pressure level: point 1 J 4 tfie lower limit. A P of the pressure-drop adjustment of the choke manifold, the choke back pressure is P 0 + 4KP Second control pressure level: closing the choke valve gradually from point W J 4Eefn make the choke pressure-drop of the choke manifold rise to point J 4 ,5 now the choke pressure-drop can reach to 2 AP the adjustment of pressure-drop during this period is L P but the back pressure produced by choke rises from P 0 + AP to P 0 + 2 AP ; Third control pressure level: closing the choke valve gradually from point M bIcan make the choke pressure-drop of the choke manifold rise to point @Ji now the choke pressure-drop can reach to 3 AV the adjustment of pressure-drop during this period is AP but the back pressure produced by choke rises from P 0 + 2 tWP P 0 + 3 AP Fourth control pressure level: closing the choke valve gradually from point F l]ilan make the choke pressure-drop of the choke manifold rise to point ®J, now the choke pressure-drop can reach to 4 AP the adjustment of pressure-drop during 9 this period is AP but the back pressure produced by choke rises from P 0 + 3 t&P P 0 + 4 AP : Fifth control pressure level: closing the choke valve gradually from point 4 J can make the choke pressure-drop of the choke manifold rise to point and shut-in casing pressure.
5. The method according to claim 4, wherein P Ois defined as the real pressure of downstream outlet of the choke manifold.
AU2009354568A 2009-10-30 2009-11-12 Multi-level refined throttle manifold and automatic control system Pending AU2009354568A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN200910207405.1A CN101694152B (en) 2009-10-30 2009-10-30 Multi-level fine choke manifold and automatic control system
CN200910207405.1 2009-10-30
PCT/CN2009/001248 WO2011050500A1 (en) 2009-10-30 2009-11-12 Multi-level refined throttle manifold and automatic control system

Publications (1)

Publication Number Publication Date
AU2009354568A1 true AU2009354568A1 (en) 2011-08-11

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AU2009101354A Ceased AU2009101354A4 (en) 2009-10-30 2009-11-12 Multi-level refined throttle manifold and automatic control system

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CN (1) CN101694152B (en)
AU (2) AU2009354568A1 (en)
WO (1) WO2011050500A1 (en)

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CN101892824B (en) * 2010-07-22 2013-07-03 中国石油天然气集团公司 Combined multi-stage pressure control method and device
CN102536191B (en) * 2012-03-15 2015-06-17 中国石油集团西部钻探工程有限公司 Automatic throttle control device for pressure-controlled well drilling
CN103132982A (en) * 2013-03-22 2013-06-05 广州东塑石油钻采专用设备有限公司 Well shutdown system by one key
WO2015107447A1 (en) * 2014-01-16 2015-07-23 Drillmec Spa Collector circuit for drilling fluid circulation system and method for diverting the circulation of the fluid
CN104481436B (en) * 2014-12-05 2017-05-10 中国石油天然气集团公司 Method and system for regulating precision pressure-control well drilling throttle valve
CN107191154B (en) * 2016-03-15 2020-07-31 中国石油化工股份有限公司 Wellhead back pressure regulating method and device
CN110892130A (en) * 2017-03-31 2020-03-17 科技能源产品有限责任公司 Controlled pressure drilling manifold, module and method
US10253585B2 (en) 2017-03-31 2019-04-09 Tech Energy Products, L.L.C. Managed pressure drilling manifold, modules, and methods
CN108643887B (en) * 2018-04-26 2020-02-21 中国石油大学(华东) Control method and control device for drilling operation
CN109538141B (en) * 2018-11-27 2020-09-29 重庆科技学院 Embedded automatic control device for drilling throttle manifold
CN112031684B (en) * 2019-06-03 2023-02-10 中国石油天然气集团有限公司 Controlled pressure drilling back pressure compensation system
CN110608026B (en) * 2019-11-07 2020-09-15 中国石油天然气股份有限公司西南油气田分公司工程技术研究院 Underground multistage fracturing intelligent sliding sleeve control system and method based on pressure wave communication
CN110887659B (en) * 2019-12-25 2021-06-25 中国海洋石油集团有限公司 Experimental device for evaluating safety of high-temperature high-pressure test circulating valve
CN111206895A (en) * 2020-03-29 2020-05-29 中国石油集团渤海钻探工程有限公司 System and method for monitoring flow of drilling fluid under fine pressure control
CN111502546B (en) * 2020-05-29 2021-11-12 中国石油天然气集团有限公司 Method for turning off underground unit of rotary steering system through ground remote control
CN114517666B (en) * 2020-11-20 2023-08-22 中国石油天然气股份有限公司 Throttling method and device for gas well, computer equipment and storage medium
CN113431513B (en) * 2021-06-01 2022-12-16 四川宏华电气有限责任公司 Full-automatic control system of high-pressure throttle manifold
CN115749710A (en) * 2021-12-17 2023-03-07 中国石油天然气集团有限公司 Hydraulic jet back pressure automatic control system and method
CN114458178B (en) * 2022-01-17 2022-08-05 大庆市天德忠石油科技有限公司 A throttle manifold for petroleum well prevents earial drainage

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WO2011050500A1 (en) 2011-05-05
CN101694152B (en) 2012-12-26
CN101694152A (en) 2010-04-14
AU2009101354A4 (en) 2011-09-29

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