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ѕреимущество и недостатке заканчивани€ с Ђнеобсаженнымї стволом

 акие ваши действи€, что бы провести циркул€цию скважины перед тем как выт€нуть колонну Ќ “.

 ер≥ айналым: Ұңғыны тұншықтарғаннан кей≥н пакер астында мұнай не газ жыньығы қалып қо€ды. ѕакер алғаннан кей≥н жанагы газдан құтылу керек. ќл үш≥н өте үлкен сақтық қажет:_ a кер≥ айналым кет≥ред≥;_ followed by a direct circulation to complete the well conditioning.Note: The reverse circulation (annulus - tubing/pipes) is always included in a workover after a well killing with the bullheading technique and also when it is necessary to expel the bottom cushion rapidly. The latter situation usually occurs after the packer release.

Procedure:Starting reverse circulationХ Gradually start the pump increasing its flowrate and monitoring the circulation pressure as well as the return flow from the tubing that indicates that the communication/circulation process has started.

Х Increase the number of pump strokes per minute until the programmed flowrate is reached and at the same time operate the choke of the tubing.

Х The value reached at the casing is the circulation pressure (ICP) and it will ensure an overbalance on the formation.

Reverse circulationХ During the circulation, the following values must be monitored and kept constant until expulsion of the gas cushion:_ circulation pressure, by operating on the tubing choke_ pump flowrate

Procedure:Gas expulsionХ When the gas cushion reaches the surface and starts to be released, the pressure at the tubing/pipes starts to decrease; to keep the established value of the circulation pressure it will be necessary to adjust on the choke.

Х Once the gas has been totally expelled, the arrival of the completion fluid at the choke causes a rapid increase of the tubing pressure; the choke must be adjusted accordingly.

End of reverse circulationХ Once the cushion has been totally expelled reduce the pump flowrate until it stops.Х Make sure that there is no pressure in the tubing and in the casing.

Direct circulationХ At the conclusion of the reverse circulation, after a complete direct circulation at the well bottom with the BOPs opened, the well can be considered to be under control and the following operations can be carried out safely.

4.  ака€ основна€ цель управлени€ за Ђцелостностью скважинойї (Ђwell integrity managementї)технкалық, оператвт≥, ұжымдыұқ жұмыстапдың ұңғы өм≥пшенд≥г≥н ұзартудағы атқарылатын жұмыстар.

.As a minimum, the following elements shall be addressed:


Х well integrity policy and strategy

Х resources, roles, responsibilities and authority levels

Х risk assessment aspects of well integrity management

Х well barriers

Х well component performance standards

Х well operating limits

Х well monitoring and surveillance

Х annular pressure management

Х well handover

Х well maintenance

Х well integrity failure management

Х management of change

Х well records and well integrity reporting

Х performance monitoring of well integrity management systems

Х compliance audit.


 ака€ цель бурового раствора дл€ ремонта скважины?

WO fluids:


Completion Fluid

Х It controls the formation pressure

Х It cleans the hole from drilling cuttings

Х It is used for carrying gravel pack fluids

Х It prevents the formation from being damaged during perforations

Packer Fluid

Х It controls the hydrostatic pressure

Х It equalizes the casing pressure behind the tubing

Х It protects the casing from contacting the fluids produced

Х It guarantees hydrostatic pressure on the packer

Х It is chemically and physically stable

Killing Fluid

Х It impedes the reservoir pressure

Х It is compatible with the formation

Х It preserves the stability of the well

Characteristics

To the extent possible, the killing fluid shall be:

Х Undamaging

Х Solids free

Х Compatible with any required additives

Х Chemically and physically stable

Х Noncorrosive

Х Not dangerous to handle

Х Environment-friendly

Х Compatible with the formation and fluids present therein

Х Have wide density and viscosity range

Х Thermally stable


 

 

‘ункции и типы раствора дл€ глушени€ скважины при ремонтных работах


Clay base mud

Profits

Х Low costs

Х Readily available

Х High suspension capability and solids

carrying capacity

Constraints

Х Clay swelling

Х Formation plugging

Х Water block and emulsion block

Х Degradability over time

Polymer base mud

Profits

Х Poor solids content

Х Low filtrate

Х High suspension capability and solids

carrying capacity

Constraints

Х Potentially damaging

Х Unstable with the temperature

Х Water block

Х Degradability over time

Oil base mud

Profits

Х Thermal stability

Х Low filtrate

Х High suspension capability and solids

carrying capacity

Х Noncorrosive

Х Low-damaging filtrate in oil reservoirs

Constraints

Х Clogging of formation

Х Wettability alteration

Х Emulsion block

Х Degradability over time

Х Polluting

Brines

Profits

Х Solids free

Х Low costs

Х Stable over time within saturation limits

Х Does not damage the formation

Constraints

Х Limited density

Х Low suspension capability and solids carrying capacity

Х May cause well control problems in highpermeability formations

Made up brines

Profits

Х Solids free

Х Wide density range

Х Controlled chemical composition

Х Does not damage the formation

Х Free from bacterial actions

Constraints

Х High costs

Х May require safety measures


 

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