2. Преимущество и недостатке заканчивания с «необсаженным» стволом

3. Какие ваши действия, что бы провести циркуляцию скважины перед тем как вытянуть колонну нкт.

Кері айналым: Ұңғыны тұншықтарғаннан кейін пакер астында мұнай не газ жыньығы қалып қояды. Пакер алғаннан кейін жанагы газдан құтылу керек. Ол үшін өте үлкен сақтық қажет:_ a кері айналым кетіреді;_ 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 circulation• 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.

• 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.

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

Reverse circulation• 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 expulsion• 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.

• 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 circulation• Once the cushion has been totally expelled reduce the pump flowrate until it stops.• Make sure that there is no pressure in the tubing and in the casing.

Direct circulation• 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. Какая основная цель управления за «целостностью скважиной» («well integrity management») технкалық, оператвті, ұжымдыұқ жұмыстапдың ұңғы өміпшендігін ұзартудағы атқарылатын жұмыстар.

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

• well integrity policy and strategy

• resources, roles, responsibilities and authority levels

• risk assessment aspects of well integrity management

• well barriers

• well component performance standards

• well operating limits

• well monitoring and surveillance

• annular pressure management

• well handover

• well maintenance

• well integrity failure management

• management of change

• well records and well integrity reporting

• performance monitoring of well integrity management systems

• compliance audit.