Conventional Cement Squeeze

• Ultra Fine Cement

• Foam-cement

• Particulates

• Sand Plug

• Often performs well as a blocking agent

• Good solution for large casing hole

• Long life

• Near wellbore application

• Poor penetration

• Provide Mechanical strength to Polymer gel

• Economical

b) What Production problems can occur due to Paraffin deposition? (1)

Deposition in pore system

Deposition in perforations

Plugging in artificial lift equipment

Coating on rods, tubing or surface flowlines

c) What kind of information will Productivity Tests supply? (1)

• Identify produced fluids and determine their respective

volume ratios.

• Measure reservoir pressure and temperature.

• Obtain samples suitable for PVT analysis.

• Determine well deliverability.

• Evaluate completion efficiency.

• Characterize well damage.

• Evaluate work over or stimulation treatment.

d) Discuss about Water Types. (1)

Water Types: Sweep water -Active aquifer,Injection water; Good water – Unavoidable-Water in oil at OWC,Oil in water emulsion,Injection water; Bad Water – Avoidable-Water competing with oil,Mechanical failure,Operational mistake Bad water: Casing leak, channeling, crossflow, fracture, breakthrough, coning, rise of OWC

e) Discuss about Classification of Formation Sands. (1)

f) List the chemicals where Asphaltene are soluble. (1)Asphaltenes Are Soluble In

• Benzene

• Toluene•

Xylene*

• Carbon Tetrachloride

• Carbon Disulfide

* These are the only recommended for use treatments . . .

g) List the key components of water control diagnosis. (1)

• Screen wells suitable for water control

• Determine the type of problem

• Find the correct water entry point

• Find the best control system

• Find suitable placement method

Question #4

a)What are the best time to test a well?

Prior to Completion- To assist in the completion decision, a drillstem test or a repeat formation test, or both, will normally be carried out.

• Post completion:Once the well has been completed a buildup, draw-down, or deliverability test is performed to quantify near wellbore and reservoir conditions and to define inflow performance characteristics.

• Prestimulation and Poststimulation:Stimulation (acidizing or fracturing) treatments are often applied to wells to improve their

performance. Usually a well test (typically a buildup test) is performed before the treatment to evaluate the need for stimulation and after the treatment, to estimate its effectiveness.

b)List the Remedial Treatment for Paraffin deposition.

Hot Oil •Steam •Solvent

•Water base removal solution

•Mechanical methods

c)What measurements should be taken during cleanup? (1)

Wellhead Pressure

• Wellhead Temperature

• Downstream Choke Pressure

• Downstream Choke Temperature

• BS&W

• Ph

• Solids returns (if frac or measuring losses returns)

• Salinity

• H2S and CO2

• Mud Weights (if required)

• Casing Pressures (if required)

• Any other information the client requires

Date: 2015-12-24; view: 608