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Unit 12. Well Completion and Production Technology

Lead-in

Ex. 1. Study the following definitions.

      1. Well treatment techniques

acid fracturing

кислотный ГРП

A well-stimulation operation in which acid, usually hydrochloric [HCl], is injected into a carbonate formation at a pressure above the formation-fracturing pressure.

surfactant

ПАВ (поверхностно-активное вещество)

A chemical that acts as a surface active agent.

well stimulation

стимуляция скважины

A treatment performed to restore or enhance the productivity of a well.

workover

КРС (капитальный ремонт скважины)

The repair or stimulation of an existing production well for the purpose of restoring, prolonging or enhancing the production of hydrocarbons.

      1. Reservoir treatment techniques

acidizing

кислотная обработка

The pumping of acid into the wellbore to remove near-well formation damage and other damaging substances.

consolidation

укрепление

A means of controlling the undesirable production of sand from weak sandstone formations. Sand consolidation chemically binds the grains of sand while maintaining sufficient permeability to achieve viable production rates.

formation damage

повреждения призабойной зоны

Alteration of the initial characteristics of a producing formation, usually by exposure to drilling fluids.

hydraulic fracturing

ГРП (гидравлический разрыв пласта)

A stimulation treatment performed on oil and gas wells in low-permeability reservoirs. Specially engineered fluids are pumped at high pressure and rate into the reservoir interval to be treated, causing a vertical fracture to open.

proppant (propping agent)

проппант (расклинивающий агент)

Sized particles mixed with fracturing fluid to hold fractures open after a hydraulic fracturing treatment.

sand control

борьба с выносом мехпримесей

The installation of equipment or application of techniques to prevent migration of reservoir sand into the wellbore or near-wellbore area.

skin

скин

A dimensionless factor calculated to determine the production efficiency of a well by comparing actual conditions with theoretical or ideal conditions. A positive skin value indicates some damage or influences that are impairing well productivity. A negative skin value indicates enhanced productivity, typically resulting from stimulation.

Ex. 2. Check how well you have understood the definitions by answering the following questions.

      1. What direction do hydraulic fractures take?

      2. Is positive skin favourable?

      3. What is necessary to keep fractures open after hydraulic fracturing?

      4. What are the purposes of workover?

      5. In what kind of formations is acidizing efficient?

      6. What is the common cause of formation damage?

      7. Why do reservoirs need consolidation?

Reading and Vocabulary

Ex. 3. Read the text, referring to the definitions if necessary.

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