CN103726834A - Sustained casing pressure diagnosis device and method - Google Patents

Sustained casing pressure diagnosis device and method Download PDF

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Publication number
CN103726834A
CN103726834A CN201210379885.1A CN201210379885A CN103726834A CN 103726834 A CN103726834 A CN 103726834A CN 201210379885 A CN201210379885 A CN 201210379885A CN 103726834 A CN103726834 A CN 103726834A
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China
Prior art keywords
pressure
liquid level
annular space
monitoring
frequency filter
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CN201210379885.1A
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CN103726834B (en
Inventor
徐开放
贺志刚
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BEIJING GRAND OILFIELD TECHNOLOGY Co Ltd
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BEIJING GRAND OILFIELD TECHNOLOGY Co Ltd
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Abstract

The invention provides a sustained casing pressure diagnosis device and method. The sustained casing pressure diagnosis device comprises a liquid level monitor for monitoring the liquid level in a sustained casing, a pressure sensor for monitoring pressure, and a flow meter for monitoring the blowout flow. A four-way joint is arranged at the position of a surface casing pressure corker and connected with a transmitting gun for monitoring the liquid level in the sustained casing, the pressure sensor for monitoring pressure and a high-pressure pipeline valve for gas blowout, and the flow meter and the pressure sensor are arranged on the high-pressure pipeline valve. The sustained casing pressure diagnosis method includes the steps of firstly, monitoring the current height of the liquid level in the sustained casing through the liquid level monitor, and calculating the current volume of the sustained casing according to the height between the liquid level and the well mouth; secondly, opening the high-pressure pipeline valve on the four-way joint of the sustained casing to conduct blowout, and calculating the volume of blowout gas through the flow meter; thirdly, monitoring the change between the pressure existing during blowout and pressure existing after blowout through the pressure sensor arranged on the high-pressure pipeline valve, and continuing to monitor the current height of the liquid level in the sustained casing through the liquid level monitor so as to judge whether leakage happens to the sustained casing or not.

Description

A kind of annular space diagnostic device with pressure and method
Technical field
The present invention relates to a kind of well performance testing technical field, refer in particular to a kind of annular space diagnostic device with pressure and method.
Background technology
When carrying out well performance testing, for example, in order to prevent the corrosive gas (H in drilling well 2s) leak into annular space, conventionally all can adopt the mode of filling ring control protection liquid to protect sleeve pipe, prevent that corrosive gas from gathering corrosion sleeve pipe near well head.
But in prior art, because general phosgene real estate well is generally containing H 2s gas is higher, and part is up to more than 10%.High sulfur-containing gas leaks into annular space, near well head, builds up, and finally corrodes sleeve pipe.The method of the filling annular protective liquid that adopt early stage, protects sleeve pipe.
But this mode likely cannot be protected annular space because following situation causes protecting liquid: flow string seepage causes annular protective liquid absorption well, casing string generation seepage to cause annular protective liquid absorption well, annular protective liquid not to add filling with well, the defective well of annular protective liquid performance indications.Find afterwards by analysis, having above-mentioned leakage is mainly because annular space leaks.Therefore how to monitor whether annular space has occurred to leak and the degree of leakage is most important for safety in production.
Summary of the invention
For the defect existing in prior art and deficiency, the object of the invention is to propose a kind of structure more reasonable, execute-in-place is more convenient directly perceived, and can monitor annular space diagnostic device with pressure and the method whether annular space is revealed.
In order to achieve the above object, the present invention proposes a kind of annular space diagnostic device with pressure, comprising:: for the pressure sensor of monitoring pressure, for monitoring the flow meter of open flow flow; Wherein at surface casing pressure cock place, one four-way is installed, four-way connects for the ejecting gun of the liquid level monitor of annulus liquid level monitoring, for the pressure sensor of monitoring pressure and the high pressure line valve for exitting; Flow meter and pressure sensor are housed on high pressure line valve.
Wherein, described liquid level monitor comprises the sonic generator for launching acoustic signals, for receiving the acoustic receiver of the acoustic signals returning, for wave filter that the described signal returning is carried out to filtering, and for according to the processor of the signal acquisition liquid level information after described filter filtering.
Wherein, described wave filter is low-frequency filter and high frequency filter; Described low-frequency filter and high frequency filter are electrically connected respectively described acoustic receiver so that described acoustic receiver sends to respectively described low-frequency filter and high frequency filter by the signal receiving; Described low-frequency filter and high frequency filter are electrically connected respectively described processor.
Wherein, described impulse generator comprises: for generation of the ejecting gun of sound wave pulse, ejecting gun produces sound wave by the differential pressure action between annular space internal pressure and ejecting gun.
Wherein, described ejecting gun is provided with inflation inlet, air venting mouth, and acoustic signals emission port, and described inflation inlet and gas pressure relief opening are by described inner chamber conducting, and described ejecting gun acoustic signals emission port place is provided with the valve of controlling described sound wave On/Off.
The embodiment of the present invention has also proposed the device of a kind of application as described in front any one to the annular space method of diagnosing with pressure, comprising:
Step 1, by liquid level monitor, monitor the liquid level in current oil well casing and annular space, and according to liquid level, apart from the height gauge of well head, calculate the volume of current annular space;
The valve that step 2, unlatching are arranged at four-way junction of casing place carries out open flow, and by flow meter, calculates the volume of open flow gas
Step 3, by be arranged at valve place pressure sensor monitoring open flow, stop pressure after open flow and change, continue to monitor liquid level in current annular space to judge whether annular space has leakage by liquid level monitor.
Step 4, according to oil well and annular pressure, change, and level change in each annular space, determine between oil well and each annular space and whether reveal.
Step 5, according to monitoring annular space volume and pressure requirement, determine nitrogen injection amount.
The beneficial effect of the technical scheme that the embodiment of the present invention provides is: the apparatus and method that the present invention proposes, can monitor producing gas well annular space, and in case giving vent to, stop ring sky reveals the corrosion and damage causing sleeve pipe.The present invention is simultaneously simple in structure, is easy to promote at the scene, without increasing too much equipment.
Accompanying drawing explanation
Fig. 1 is liquid level monitoring work schematic diagram;
Fig. 2 is the structural representation of the embodiment of the present invention;
Fig. 3 is the schematic flow sheet of the annular space diagnostic method with pressure of the embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention one is described further.
The present invention proposes a kind of annular space diagnostic device with pressure, comprising: for the pressure sensor of monitoring pressure, for monitoring the flow meter of open flow flow.Wherein at surface casing pressure cock place, one four-way is installed, four-way connects the ejecting gun for annulus liquid level monitoring, for the pressure sensor of monitoring pressure, and for the high pressure line valve of open flow, flow meter and pressure sensor is housed on high pressure line valve.
As shown in Figure 2, this system has comprised:
The cock 1 of four-way junction of casing: diagnose from this, the wellhead equipment of employing is minimum, most convenient;
Four-way 2: will mate with the interface of cock 1, be generally the high clinching of AC, or 1/2 " NPT button;
Pressure sensor 3: be used for monitoring surface casing pressure.The general casing pressure that at least will monitor A annular space and B annular space.Oil pressure can directly be read out by oil pressure gauge;
Liquid level monitoring equipment 4: be used for monitoring liquid level, monitoring number of times is determined as required, once also record analysis of monitoring in general a hour;
Cock 5: when monitoring liquid level, sealing monitoring channel;
Cock 6: be used for adjusting flow, adopt with 0.5 " needle valve;
Flow meter 7: be used for monitoring flow.In order to monitor accurately, available different ranges standby.Range ability is at 10-5000m3/d.
Chromacoder 8: be used for converting the signal of pressure sensor and flow meter monitoring to computer discernible data signal;
Terminal processes 9: map by computer software, show monitored data, so that care diagnostic.
Open flow 10: will contain H 2the gas of S is guided to open flow outside well site.
Hole cover 11: measuring well lid, to the space of four way cock, need to turn to ejecting gun to judge whether.Generally, while being vertically connected on cock, monitoring effect is best.But during limited space, have to convert ejecting gun to horizontal level can install with assurance rifle.
Well site 12: cock 6 and flow meter 7 are guided to outside well site, handled easily.
As shown in Figure 1, described liquid level monitoring dress comprises: for generation of the ejecting gun 11 of sound wave pulse, for and connect the nitrogen gas cylinder of described ejecting gun or dioxide bottle 2, for the monitor 13 of reception & disposal acoustic signals, monitor 13 is connected with ejecting gun 11 by line.Ejecting gun 11 is fixed on four-way.
In use, can produce a sound wave pulse by ejecting gun, gas in sleeve pipe is formed to sound wave pulse.In the gas of sound wave in sleeve pipe, propagate, some place that can change at oil connection, tubing anchor and cased perforated uniform section reflects; Another part reflects at gas-liquid interface place.The receiver pulse receiver of well head receives after reflected signal, after filtering, sends to processor by wave filter.
Because sound wave pulse signal is propagated in gas, it is different running into the energy that the obstruction of Different Rule fires back.Be set to binary channels, strainer can be low-frequency filter and high frequency filter; Described low-frequency filter and high frequency filter are electrically connected respectively described acoustic receiver so that described receiver sends to respectively described low-frequency filter and high frequency filter by the signal receiving; Described low-frequency filter and high frequency filter are electrically connected respectively described processor.Wherein, low-frequency filter is connected respectively an amplifying circuit with high frequency filter, to carry out signal amplification.So just can be when carrying out liquid level monitoring, also box cupling or other obstruction in monitor well.
Wherein, described ejecting gun is provided with inflation inlet, air venting mouth, and acoustic signals emission port, and described inflation inlet and gas pressure relief opening are by described inner chamber conducting, and described ejecting gun acoustic signals emission port place is provided with the valve of controlling described sound wave On/Off.
When work, ejecting gun is fixed on four-way, and ejecting gun sends acoustic signals by differential pressure action.Acoustic signals has fed back two groups of information, and one group is sleeve pipe (drill string) box cupling signal, and one group is liquid level signal.Microphone by ejecting gun receives, feeds back to wave filter and filters clutter, message handler processing amplification.Processor is dual path processor, and a passage is processed sleeve pipe (drill string) box cupling signal, and another passage is processed liquid level signal.Last these two groups of signals are processed into two suite money and print, and engineering staff reads curve, calculates level.
Wherein, the liquid level monitor of the embodiment of the present invention, its operating principle is:
Transmit: ejecting gun produces sound wave by differential pressure action and in pit shaft, propagates, reflects.
Reception & disposal: liquid level monitor is connected with ejecting gun by line, receives box cupling, obstruction or liquid level reflected signal and processes respectively.
Signal interpretation: find liquid level position by monitoring curve, and calculate level.
Wherein, the mode of calculating level mainly contains two kinds of methods:
Box cupling method: by liquid level signal and box cupling signal and the actual pipe string contrast of going into the well.
Sound velocity method: by temperature T, pressure P and gas phase composition etc., calculate velocity of sound v, the time t on recycling monitoring curve, thus calculate liquid level position H.Because well temperature changes from top to bottom, while considering gas column pressure, pressure also changes, and accurately calculate liquid level position, need to carry out numerical computations.
The embodiment of the present invention also comprises: four-way: four-way is connected on cock, and its effect is as follows: by the installation site of ejecting gun by vertically becoming level, to guarantee that restricted clearance can install ejecting gun; By connecting high pressure line, gas in annular space is carried out to open flow; Setting pressure Sensor monitoring annular pressure.
Four-way inner via hole 5-8mm, material requires anti-sulphur.According to general phosgene field existing production tree cock type, the button-type that four-way can be met to cock place is processed into 1/2 " NPT, then do one 1/2 " mother NPT turn M20 × 1.5 male and one 1/2 " mother NPT turns 11/8 " two joints that AE is male, joint material is the same with four-way.
Pressure meter (pressure sensor): pressure meter requires anti-sulphur.Pressure rank is 50MPa.Pressure meter will have line to receive computer, can carry out data transaction simultaneously.
Gas flowmeter: be arranged on four-way and connect high pressure line place.Flow when considering downhole gas column volume and being diluted in air, and open flow time, thus determine flow meter range.Because there is the adjustable governor pressure of cock before pressure meter, so this table bearing capacity is less demanding, 30MPa.Flow meter range scope is determined according to gas volume situation in annular space and open flow speed, and it is standby that the gas flowmeter of different ranges can be prepared in scene.
High pressure line: pressure rank 50MPa, the anti-sulphur of material.Length will enough be connected to open flow outside well site.To there is threeway to fill cock and flow meter simultaneously.Because gas is to release by the cock on drilling spool, so, this pipeline internal diameter 5-8mm.Also to be furnished with high-voltage quick joint simultaneously.
Needle valve (cock): be used for regulating open flow flow.Meanwhile, during liquid level monitoring, require to have seal channel, this valve to be used for the other end of shutoff four-way.Material requires anti-sulphur, and pressure rank is 50MPa.
The embodiment of the present invention also proposed a kind of device of application of aforementioned to the annular space method of diagnosing with pressure, and its flow process as shown in Figure 3, comprising:
Step 1, by liquid level monitor, monitor the liquid level in current oil well casing and annular space, and according to liquid level, apart from the height gauge of well head, calculate the volume of current annular space;
The valve that step 2, unlatching are arranged at four-way junction of casing place carries out open flow, and by flow meter, calculates the volume of open flow gas
Step 3, by be arranged at valve place pressure sensor monitoring open flow, stop pressure after open flow and change, continue to monitor liquid level in current annular space to judge whether annular space has leakage by liquid level monitor.
Step 4, according to oil well and annular pressure, change, and level change in each annular space, determine between oil well and each annular space and whether reveal.
Step 5, according to monitoring annular space volume and pressure requirement, determine nitrogen injection amount.
Certainly; the present invention also can have other embodiment; in the situation that not deviating from spirit of the present invention and essence thereof; person of ordinary skill in the field is when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.

Claims (6)

1. an annular space diagnostic device with pressure, is characterized in that, comprising: for the pressure sensor of monitoring pressure, for monitoring the flow meter of open flow flow; Wherein at surface casing pressure cock place, one four-way is installed, four-way connects for the ejecting gun of the liquid level monitor of annulus liquid level monitoring, for the pressure sensor of monitoring pressure and the high pressure line valve for exitting; Flow meter and pressure sensor are housed on high pressure line valve.
2. annular space according to claim 1 diagnostic device with pressure, it is characterized in that, described liquid level monitor comprises the ejecting gun for launching acoustic signals, for receiving the receiver of the acoustic signals returning, for wave filter that the described acoustic signals returning is carried out to filtering, and for according to the processor of the signal acquisition liquid level information after described filter filtering.
3. annular space according to claim 2 diagnostic device with pressure, is characterized in that, described wave filter is low-frequency filter and high frequency filter; Described low-frequency filter and high frequency filter are electrically connected respectively described acoustic receiver so that described acoustic receiver sends to respectively described low-frequency filter and high frequency filter by the signal receiving; Described low-frequency filter and high frequency filter are electrically connected respectively described processor.
4. annular space according to claim 3 diagnostic device with pressure, is characterized in that, described impulse generator comprises: for generation of the ejecting gun of sound wave pulse, and connect nitrogen gas cylinder or the dioxide bottle of described ejecting gun.
5. annular space according to claim 4 diagnostic device with pressure, it is characterized in that, described ejecting gun is provided with inflation inlet, air venting mouth, and acoustic signals emission port, described inflation inlet and gas pressure relief opening are by described inner chamber conducting, and described ejecting gun acoustic signals emission port place is provided with the valve of controlling described sound wave On/Off.
6. the device of application as described in claim 1-5 any one, to an annular space method of diagnosing with pressure, comprising:
Step 1, by liquid level monitor, monitor the liquid level in current oil well casing and annular space, and according to liquid level, apart from the height gauge of well head, calculate the volume of current annular space;
The valve that step 2, unlatching are arranged at four-way junction of casing place carries out open flow, and by flow meter, calculates the volume of open flow gas
Step 3, by be arranged at valve place pressure sensor monitoring open flow, stop pressure after open flow and change, continue to monitor liquid level in current annular space to judge whether annular space has leakage by liquid level monitor.
Step 4, according to oil well and annular pressure, change, and level change in each annular space, determine between oil well and each annular space and whether reveal.
Step 5, according to monitoring annular space volume and pressure requirement, determine nitrogen injection amount.
CN201210379885.1A 2012-10-10 2012-10-10 A kind of sustained casing pressure diagnosis device and method Active CN103726834B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104425045A (en) * 2013-09-11 2015-03-18 中国广核集团有限公司 Information processing method of loop voltage stabilizer in nuclear power plant and checking method
CN105089591A (en) * 2015-06-19 2015-11-25 中国石油天然气股份有限公司 Method for determining annular gas-liquid interface of steam injection well
CN106761568A (en) * 2017-03-10 2017-05-31 中国石油大学(北京) One kind administers gas well annular space method with pressure
WO2018000701A1 (en) * 2016-06-26 2018-01-04 江苏省金峰石油机械制造有限公司 Casing overflow monitoring apparatus
CN108678727A (en) * 2018-05-08 2018-10-19 中国石油天然气股份有限公司 Annular protective liquid liquid replenishing method and device
CN108729883A (en) * 2018-04-24 2018-11-02 中国石油天然气股份有限公司 Protect the liquid surface height controlling method and apparatus of liquid
CN108765889A (en) * 2018-04-17 2018-11-06 中国石油集团安全环保技术研究院有限公司 Production of hydrocarbons operational safety method for early warning based on big data technology
CN108764729A (en) * 2018-05-29 2018-11-06 中海油安全技术服务有限公司湛江分公司 Oil/gas well Integrity Verification manages system
CN112798043A (en) * 2020-12-31 2021-05-14 北京石油化工学院 Nondestructive detection device and method for marine oil gas flexible hose annulus

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CN202926319U (en) * 2012-10-10 2013-05-08 北京格瑞迪斯石油技术有限公司 Annulus under-pressure diagnostic device

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US3974690A (en) * 1975-10-28 1976-08-17 Stewart & Stevenson Oiltools, Inc. Method of and apparatus for measuring annulus pressure in a well
RU2286452C1 (en) * 2005-05-14 2006-10-27 Общество с ограниченной ответственностью "Астраханьгазпром" Survey method for well tubing-casing annulus
CN101135236A (en) * 2007-09-18 2008-03-05 中国石油天然气集团公司 Collectively monitored throttling and controlling device
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Cited By (12)

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Publication number Priority date Publication date Assignee Title
CN104425045A (en) * 2013-09-11 2015-03-18 中国广核集团有限公司 Information processing method of loop voltage stabilizer in nuclear power plant and checking method
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CN106761568A (en) * 2017-03-10 2017-05-31 中国石油大学(北京) One kind administers gas well annular space method with pressure
CN106761568B (en) * 2017-03-10 2019-03-29 中国石油大学(北京) A kind of improvement gas well annular space method with pressure
CN108765889A (en) * 2018-04-17 2018-11-06 中国石油集团安全环保技术研究院有限公司 Production of hydrocarbons operational safety method for early warning based on big data technology
CN108729883A (en) * 2018-04-24 2018-11-02 中国石油天然气股份有限公司 Protect the liquid surface height controlling method and apparatus of liquid
CN108678727A (en) * 2018-05-08 2018-10-19 中国石油天然气股份有限公司 Annular protective liquid liquid replenishing method and device
CN108764729A (en) * 2018-05-29 2018-11-06 中海油安全技术服务有限公司湛江分公司 Oil/gas well Integrity Verification manages system
CN112798043A (en) * 2020-12-31 2021-05-14 北京石油化工学院 Nondestructive detection device and method for marine oil gas flexible hose annulus

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