WO2004027208A1 - Systeme continu permettant d'echantillonner et de degazer une boue de forage - Google Patents

Systeme continu permettant d'echantillonner et de degazer une boue de forage Download PDF

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Publication number
WO2004027208A1
WO2004027208A1 PCT/EP2003/009952 EP0309952W WO2004027208A1 WO 2004027208 A1 WO2004027208 A1 WO 2004027208A1 EP 0309952 W EP0309952 W EP 0309952W WO 2004027208 A1 WO2004027208 A1 WO 2004027208A1
Authority
WO
WIPO (PCT)
Prior art keywords
drilling mud
degassing
sampling
hydraulic
degasser
Prior art date
Application number
PCT/EP2003/009952
Other languages
English (en)
Inventor
Carlo Bezzola
Original Assignee
Geolog S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Geolog S.P.A. filed Critical Geolog S.P.A.
Publication of WO2004027208A1 publication Critical patent/WO2004027208A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/067—Separating gases from drilling fluids

Definitions

  • the invention refers to a system for the continuous sampling and degassing of a liquid sample, in particular of a drilling mud.
  • drilling mud - flow into the drilling hole this fluid has different functions, including taking back to the surface the rocky debris produced by the mechanic impact of the bit on the drilled rocky layer and the gaseous products contained in it.
  • hydrocarbons have particular importance because they indicate the existence of an oil or gas reservoir.
  • the gaseous fraction contained in the drilling mud which is lead to the surface is commonly extracted by means of a system known as degasser, after which it is diluted into a transportation gas, usually air, and it is finally transferred to different analytical systems which are able to identify, both in quantity and quality, the various hydrocarbon components present in it.
  • the traditional degasser is made of a cylinder-shaped container with a mud entry in the lower part and a mud exit in the upper part. Inside the cylinder is a mechanical mud agitator operated by an electric or pneumatic engine creating the mud's centrifugal movement which aids the separation of the gaseous fraction toward the top and at the same time creates circulation of the fluid towards the cylinder.
  • the gas that separates on the top part of the cylinder is conveyed to the analytical systems by means of a depression line.
  • the efficiency of the degassing system is variable according to the level of immersion of the degasser in the drilling mud and to the flow- rate of the drilling mud.
  • a degasser known as constant sampling degasser has spread in the market, where a volumetric pump driven by an electric engine draws the drilling mud to be degassed in the nearest possible point to its return to the surface.
  • this degassing system has some disadvantages in certain operative conditions, particularly in deep waters wells drilling.
  • the return of the mud to the surface is aided by an additional pump which injects clean (degassed) mud in the mud return circuit, in this way diluting the mud coming from the well and therefore also the gaseous fraction contained in it.
  • the drilling mud by having to ascend through a remarkably high column of water, progressively cools down until it reaches the degassing station with temperatures lower than 10°C. In this situation, it is evident that hydrocarbons taken to the surface can be in small quantities and in biphasic balance between gas and liquid.
  • the drilling mud flow-rate for a traditional constant sampling degasser cannot be modified and for this reason it can be in some operating conditions insufficient and totally inadequate if compared to the small fraction of hydrocarbons which is supposed to be contained in the drilling mud.
  • Aim of the present invention is to provide a sampling and degassing system for liquids, in particular for oil drilling mud, which solves the inconveniences tied to a traditional system, and a particular aim of the present invention is to provide a sampling and degassing system of drilling mud which is adaptable to the different operating conditions of hydrocarbons in the drilling mud so as to always allow a correct evaluation in terms of quality and quantity of the components of hydrocarbons contained in it.
  • a more particular aim of the present invention is to provide a sampling and degassing system of an oil drilling mud which allows a correct evaluation both in terms of quantity and quality of the hydrocarbons components present in the drilling mud also in relation to deep waters wells drilling.
  • a system for the sampling and degassing of a oil drilling mud which includes a degasser and a volumetric pump for the feeding of the oil drilling fluid to the degasser, whose feature is that this volumetric pump is operated by a first hydraulic motor connected to a hydraulic control unit for the selective adjustment of the pump flow-rate on at least a first or a second flow value.
  • the flow-rate of the volumetric pump can be regulated from 1.5 litres/min to 3 litres/min.
  • volumetric capacity represents the ideal adoptable solution for the drilling mud sampling and degassing in deep water wells, where the hydrocarbons gaseous fraction - generally more diluted in the drilling mud to be degassed - is compensated by a higher flow-rate of the drilling mud through the degasser.
  • the drilling mud sampling and degassing system can include an additional hydraulic engine for the starting of the degasser agitator, which can adjust the agitator's rotating speed on at least the first and the second rotating speed.
  • the rotation speed of the degasser agitator can be selectively adjusted from 1500 r.p.m. to 3000 r.p.m.
  • the faster rotation speed of the stirrer fit best for the degassing of a mud in the most critical conditions because the greater turbulence aids the separation of the gaseous fraction contained in the mud, and is therefore ideal in the drilling conditions of a deep waters wells, when the hydrocarbons gaseous fraction can result greatly diluted in the drilling mud.
  • the sampling and degassing system includes a thermal conditioning unit of the drilling mud.
  • the thermal conditioning of the drilling mud allows to transform to the gaseous phase hydrocarbons disvolved as liquid phase in the drilling mud, above all present in the drilling mud of Deep waters wells.
  • the degasser Preferably on the degasser downstream, there should be a condensation system for steam elimination contained in the gaseous fraction released by the drilling mud, and a security valve which stops any possible mud penetration in the drawing circuit of the gaseous fraction released from the mud itself.
  • the hydraulic engine that operates the positive displacement pump can have a twin shaft on its exit that can operate both the volumetric pump and a rotating moving member of a mud suction filter.
  • the hydraulic engine that operates the volumetric pump can have a single shaft on its exit that only operates the volumetric pump.
  • a third hydraulic engine can be provided in order to operate a rotating moving member of a mud suction filter and the selective adjustment of its rotating speed.
  • the filter group includes a filter composed of a plate with a number of clearance holes, a moving unit made of a sliding brush on the filter's surface, with rotary alternate motion coaxial to the filter, for the removal of possible sediments deposited in the filter's holes, and a transmission system to convert the rotary motion of the third hydraulic engine in alternated motion of the brush.
  • Figure 1 is a schematic representation of the hydraulic circuit of the system for the sampling and degassing of the drilling mud that complies with the most likeable fulfilment solution of the present invention
  • Figure 2 is a schematic representation of the hydraulic circuit of the system for the sampling and degassing of the drilling mud that complies with a further preferred fulfilment of the present invention
  • Figure 3 shows a schematic section of the degasser tank, complying to a way of fulfilling the present invention.
  • Figure 4 shows a schematic section of the mud suction filter, complying with a way of fulfilling the present invention.
  • the sampling and degassing system of an oil drilling mud includes a degasser 2 equipped with a rotating agitator 4 for the mud's circulation through degasser 2 and its centrifugation for the separation of the gaseous phase contained in it.
  • degasser 2 includes a cylinder- shaped container 6 provided with a mud inlet connection 8 for receiving the mud to be degassed in one of the axially lower part, and a mud outlet connection 10 to discharge the degassed mud, in opposite part to filler 8.
  • the outlet 10 of degasser 2 should have a flexible pipe connected to it (not shown) to allow the mud's conveying towards a collecting tank thus avoiding air entrance in the same degasser.
  • the cylinder degasser tank 6 has an optimum capacity of 1.5 litres.
  • the rotating agitator 4 includes a motorised coaxial shaft 12 internal to cylinder 6 of the degasser 2 and a series of radial vanes 14 which extend from shaft 12 of agitator 4 at an axial height of the cylinder degasser tank 6 which is intermediate between mud inlet 8 and mud outlet 10.
  • the inside lateral wall of the cylinder degasser tank 6 of degasser 2 has two baffles 16 which brake the regular rotation flow of the mud to be degassed inside degasser 2 creating a state of turbulent flow that accelerates mud degassing.
  • the axial extremity of shaft 12 of agitator 4 opposite to the radial legs 14 is equipped with a radial disk 18 which protects the rotating bearings (not shown) of agitator 4, and in general the parts of degasser 2 positioned in the top part of degasser 2, from contact with the circulating mud.
  • the gaseous fraction obtained from the drilling mud degassing composed of a mix of hydrocarbons which must be analysed both in terms of quantity and quality, piles up in the top part of degasser 2 and is conveyed to an analytic circuit though a vacuum suction line in which the carrier gas, generally air, flows with a controlled flow- rate; the carrier gas has a radial inlet 20 in the upper part of the degasser 2 and an axial exit 22 on the lid 24 of degasser 2; this exit 22 communicates with a condensate separator 72.
  • the broken line 26 represents the level of drilling mud inside degasser 2.
  • figure 3 big arrows indicate the flow direction of the drilling mud through degasser 2, while smaller arrows indicate the flow direction of the carrier gas of the gaseous fraction that has been degassed from the drilling fluid.
  • the oil drilling mud circulating circuit through degasser 2 is illustrated by a broken line 28 and includes a system 30 for the mud's thermal conditioning upstream of degasser 2 whose exit is connected by a duct 28' to the inlet of degasser 2, upstream of the mud's thermal conditioning system 30 there is a volumetric pump 32 whose delivery is connected by a duct 28" to the conditioning system's inlet, and upstream of the positive displacement pump 32 a unit 34 of the mud suction filter connected by a duct 28'" to the inlet of the volumetric pump 32.
  • the thermal conditioning system 30 is preferably made of a double interspaced container where one interspace includes heating resistors in an oil bath while in the adjacent one drilling mud is circulating.
  • Drilling mud temperature can be adjusted before its entrance in degasser 2 by controlling the heating resistors. Drilling mud temperature is therefore kept over the evaporation temperature of the volatile hydrocarbons components, which are important for analysis.
  • the volumetric pump 32 is preferably a peristaltic pump based on the capacity of an elastomeric tube to retrieve to its original shape after compression made by a couple of rollers which completely obstruct the tube fixing a known volume of mud transferred from the pump's intake to the pump's delivery.
  • Filter's unit 34 is connected to a flexible drive shaft 40, powered, as we will see, by an appropriate engine and indicated by a chain in figure 1 , and includes a rotating unit (not shown), for example a scraper powered by the rotating shaft 40 for the cleaning of the perforated screen plate of the mud suction filter from mud deposits.
  • a rotating unit for example a scraper powered by the rotating shaft 40 for the cleaning of the perforated screen plate of the mud suction filter from mud deposits.
  • the mud suction filter unit 34 must be positioned in the nearest position possible to the well head in order to avoid that drilling mud releases part of its gaseous fraction into the atmosphere before its introduction in the sampling and degassing system.
  • the sampling and degassing system includes a hydraulic system for controlling movements of: mud agitator 4 of the degasser 2 on one side, and volumetric pump 32 and rotating shaft 40 of mud suction filter unit 34 on the other.
  • the hydraulic system includes a main hydraulic unit 1 in which an electric engine 3 mounted on an oil tank 5 is coupled by a flanged connection 9 to a double pump 7,7' immersed in the oil tank 5.
  • the double pump 7,7' is preferably a double gear pump. Each pump of the double pump 7,7' is part of a corresponding hydraulic system for the control of a corresponding hydraulic engine 11 ,11'.
  • Each hydraulic circuit includes a hydraulic line 13, 13' of feeding of hydraulic engine 11 , 11' which connects every hydraulic pump 7,7' to the corresponding hydraulic engine 11, 11', and a main return hydraulic line 15, 15' which connects the outlet of every hydraulic motor 11 ,11' to the oil tank 5.
  • Hydraulic engine 11 has a twin-shaft on its exit connected to the axis of the volumetric pump 32, in order to transmit the rotation to the same pump 32, and to shaft 40 of mud suction filter unit 34, in order to transmit the rotation to the same shaft 40.
  • connection between the hydraulic engine 11 twin-shaft and shaft 40 of mud suction filter unit 34 is preferably made with a safety torque limiter in order to save the hydraulic engine 11 and the parts mechanically connected to it, in case the shaft 40 of the mud suction filter 34 becomes suddenly blocked.
  • the other hydraulic motor 11' has a simple shaft on its exit connected to shaft 12 of the agitator 4 in order to transmit the rotation to the agitator 4.
  • Every hydraulic line 13,13' for the feeding of the hydraulic engine 11 , 11' should have a corresponding flow regulator 17, 17' needed to adjust the flow-rate of oil supply to the corresponding hydraulic engine 11 , 11'.
  • Adjustment of oil flow-rate by means of the flow-rate regulators 17, 17' is carried out by sending to discharge the quantity of oil in excess through secondary return lines 19,19' which flow into the main hydraulic return lines 15,15'.
  • the adjustment of the oil flow-rate can be a continuous adjustment in order to continually regulate the hydraulic engine 11 , 11' rotation speed or it can be a discrete adjustment in order to regulate the hydraulic engine 11 , 11' rotation speed only on discrete values.
  • Every hydraulic line 13, 13' for the feeding of the hydraulic engine 11 , 11' is equipped with a solenoid valve 21 , 21' , upstream of the flow regulator 17, 17', for the individual switch on/off of the two hydraulic engines 11 or 11'.
  • Command solenoid valves 21 , 21 ' are operated to interrupt the oil-supply of hydraulic engine 11 , 11' sending the oil to discharge through other secondary return lines 23, 23' flowing into the main hydraulic return lines 15, 15'.
  • the flow-rate regulator of the hydraulic engine 11 circuit is only settable on discrete values of flow-rate, for example two, which determine a different rotation speed of the volumetric pump 32 corresponding to a two different constant flow- rate of the mud.
  • variable discrete values from 1.5 litres/min to 3 litres/min.
  • sampling and degassing system may be aided by accessories, which improve safety and check the correct working of the system.
  • a magnetic proximity sensor which monitors the effective rotation of the pump's rotor, together with a flow sensor which verifies the effective mud circulation through the pump.
  • a magnetic proximity sensor can also be positioned for checking the actual rotation of radial vanes 14 of agitator 4 of degasser 2.
  • Figure 2 illustrates a hydraulic circuit different from the one described in figure 1 essentially for the fact that it allows an independent regulation of the volumetric pump 32 rotating speed from the mud suction filter unit 34 moving device.
  • Figure 4 illustrates a preferable way to set up a mud suction filter unit, which is suitable for the hydraulic circuit of figure 2.
  • the mud suction filter unit 34 includes: a mud collecting chamber 36 opened on one side and with a 28'" exit line connected to the volumetric pump inlet 32; a filter 38 made by a metal screen plate with a number of clearance holes 39, this same filter 38 is positioned as closing of the opened side of the collecting chamber 36; a metal brush 40 which slides on the outer side of the filter 38 to clear this same filter 38 from mud encrustation which tend to sediment in its holes 39, this brush 40 is designed like a coaxial flattened cylinder, exactly opposite to filter 38; a transmission system 42 to transform the continuous rotating movement of the shaft 44 of hydraulic engine 11", in alternate rotating movement of brush 40 around its axis; and a box 46 which contains the transmission system 42, with the frame of the hydraulic engine 11" fixed on its outside, and the related shaft 44 positioned inside box 46 for motion transfer to transmission system 42.
  • Filter 38 is preferably made by an interchangeable metal screen plate with a number of clearance holes 39 with different holes cross sections according to the features of the solid in the drilling mud.
  • Transmission system 42 includes: a small shaft 48 parallel but off- centre compared to shaft 44 of the hydraulic engine 11"; this small shaft 48 is fixed to the internal side of box 46; a transversal connecting rod 50 which connect a radial arm 52, fixed to small shaft
  • an oscillation rod 56 of brush 40 positioned through the containing box 46 of transmission system 42, perpendicular to the small shaft 48 and connected to it by means of an orthogonal transmission joint 58.
  • the containing box 46 is made wet seal because filter group 34 is completely immersed in the flow of the drilling mud to be sampled.
  • FIG. 60 and 62 in figure 4 illustrates the inlet and the outlet of the hydraulic oil circuit of hydraulic engine 11".
  • FIG 4 indicates a rigid coupling clamp between the external frame of the hydraulic engine 11" and the mud exit line 28'" of manifold 36, this clamp 64 has an adjusting screw 65 to put the two parts in contact, while 66 indicates an adjustable spring 67 for adjusting the contact pressure between brush 40 and the external surface of filter 38.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne un système d'échantillonnage et de dégazage de boue de forage garantissant une efficacité constante dans différentes conditions de fonctionnement (différents états chimico-physiques de la boue de forage, différentes conditions de puits, etc.). Ledit système comprend un dégazeur (2) et une pompe volumétrique (32) destinée à fournir la boue de forage audit dégazeur, la caractéristique de ladite pompe (32) étant de fonctionner au moyen d'un moteur hydraulique (11) afin de régler sélectivement la pompe volumétrique (32) sur différents niveaux de débit de boue.
PCT/EP2003/009952 2002-09-19 2003-09-08 Systeme continu permettant d'echantillonner et de degazer une boue de forage WO2004027208A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20021993 ITMI20021993A1 (it) 2002-09-19 2002-09-19 Sistema continuo di campionamento e degasazione controllata di un fango di perforazione petrolifera.
ITMI2002A001993 2002-09-19

Publications (1)

Publication Number Publication Date
WO2004027208A1 true WO2004027208A1 (fr) 2004-04-01

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IT (1) ITMI20021993A1 (fr)
WO (1) WO2004027208A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875712A1 (fr) * 2004-09-30 2006-03-31 Geoservices Dispositif d'extraction d'au moins un gaz contenu dans une boue de forage et ensemble d'analyse associe
EP2557265A1 (fr) * 2011-08-10 2013-02-13 Geoservices Equipements Dispositif pour extraire au moins un gaz contenu dans un fluide circulant
WO2017034574A1 (fr) * 2015-08-27 2017-03-02 Halliburton Energy Services, Inc. Système de régulation de dilution de dégazeur d'échantillon
WO2017156093A1 (fr) * 2016-03-11 2017-09-14 Baker Hughes Incorporated Pompe à boue et système d'extraction de gaz sous vide
US11530610B1 (en) 2021-05-26 2022-12-20 Halliburton Energy Services, Inc. Drilling system with fluid analysis system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635735A (en) * 1984-07-06 1987-01-13 Schlumberger Technology Corporation Method and apparatus for the continuous analysis of drilling mud
US4668251A (en) * 1985-11-21 1987-05-26 Burgess & Associates Mfg., Inc. Mud pump degassing and supercharging apparatus
US5090256A (en) * 1989-04-26 1992-02-25 Geoservices Method and apparatus for sampling the gaseous content of a liquid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635735A (en) * 1984-07-06 1987-01-13 Schlumberger Technology Corporation Method and apparatus for the continuous analysis of drilling mud
US4668251A (en) * 1985-11-21 1987-05-26 Burgess & Associates Mfg., Inc. Mud pump degassing and supercharging apparatus
US5090256A (en) * 1989-04-26 1992-02-25 Geoservices Method and apparatus for sampling the gaseous content of a liquid

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2875712A1 (fr) * 2004-09-30 2006-03-31 Geoservices Dispositif d'extraction d'au moins un gaz contenu dans une boue de forage et ensemble d'analyse associe
WO2006035124A1 (fr) * 2004-09-30 2006-04-06 Geoservices Dispositif d'extraction d'au moins un gaz contenu dans une boue de forage et ensemble d'analyse associe.
JP2008514837A (ja) * 2004-09-30 2008-05-08 ジオサービシズ 掘削泥に含まれる少なくとも一つのガスを取り出すための装置及び関連した分析アッセンブリ
US7779667B2 (en) 2004-09-30 2010-08-24 Geoservices Equipements Device for extracting at least one gas contained in a drilling mud and associated analysis assembly
JP4904275B2 (ja) * 2004-09-30 2012-03-28 ジェオセルヴィス・エキップマン 掘削泥に含まれる少なくとも一つのガスを取り出すための装置及び関連した分析アッセンブリ
WO2013021010A1 (fr) * 2011-08-10 2013-02-14 Geosrvices Equipements Dispositif pour extraire au moins un gaz contenu dans un fluide en circulation
EP2557265A1 (fr) * 2011-08-10 2013-02-13 Geoservices Equipements Dispositif pour extraire au moins un gaz contenu dans un fluide circulant
WO2017034574A1 (fr) * 2015-08-27 2017-03-02 Halliburton Energy Services, Inc. Système de régulation de dilution de dégazeur d'échantillon
GB2556728A (en) * 2015-08-27 2018-06-06 Halliburton Energy Services Inc Sample degasser dilution control system
US10625179B2 (en) 2015-08-27 2020-04-21 Halliburton Energy Services, Inc. Sample degasser dilution control system
GB2556728B (en) * 2015-08-27 2021-06-02 Halliburton Energy Services Inc Sample degasser dilution control system
US11065561B2 (en) 2015-08-27 2021-07-20 Halliburton Energy Services, Inc. Sample degasser dilution control system
WO2017156093A1 (fr) * 2016-03-11 2017-09-14 Baker Hughes Incorporated Pompe à boue et système d'extraction de gaz sous vide
US11530610B1 (en) 2021-05-26 2022-12-20 Halliburton Energy Services, Inc. Drilling system with fluid analysis system

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Publication number Publication date
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