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What is injectivity test?

What is injectivity test?

1. n. [Production Testing] A procedure conducted to establish the rate and pressure at which fluids can be pumped into the treatment target without fracturing the formation.

What is injectivity in drilling?

The injectivity index, represented by the symbol I, in B/D/psi, is defined as the ratio of the injection rate, Qinj to the difference between the bottom hole pressure, Pwf and the average reservoir pressure, Pr, avg.

What is falloff test in well testing?

1. n. [Well Testing] The measurement and analysis of pressure data taken after an injection well is shut in. These data are often the easiest transient well-test data to obtain.

What is a step rate test?

Step Rate Test (SRT) is commonly used to estimate formation parting (or fracture opening) pressure for stimulated wells. SRTs may also focus on changes of well performance at different rates / pressures that is of special interest for stress-sensitive reservoirs such as fractured carbonates.

What is well injectivity?

[′wel ‚in·jek′tiv·əd·ē] (petroleum engineering) The ability of an injection well (water or gas) to receive injected fluid; can be negatively influenced by formation plugging, borehole scale, or liquid blocking around the lower end of the borehole.

How does a drill stem test work?

A drill stem test (DST) is a method of formation evaluation. The test allows fluids in the formation being evaluated to flow into the drill stem and to the surface. Pressure-recording devices in the drill stem test tool measure and record pressure in the well while it is both flowing and not flowing (shut in).

What is pressure buildup test?

A pressure buildup test refers to a test where a well is produced at a relatively constant rate for an extended period of time and then shut-in (if its not then we must apply superposition!!). The bottom hole flowing pressure is then measured as a function of time.

What is pulse testing?

Pulse-testing utilizes a sensitive differential-pressure gauge at a responding well to measure and record the response generated by a series of flow rate changes (pulses) at an adjacent or pulsing well.

What is formation parting pressure?

Formation Parting Pressure is the pressure which will initiate formation fracture.

What is a step rate test in oilfield?

1. n. [Well Completions] A test performed in preparation for a hydraulic fracturing treatment in which an injection fluid is injected for a defined period in a series of increasing pump rates.

What is productivity index?

The productivity index is a measure of the well potential or ability to produce and is a commonly measured well property1. The symbol J is commonly used to express the productivity index; as well as, being the preferred symbol by the Society of Petroleum Engineers.

What is leak off test drilling?

Leakoff tests (LOTs) are performed to test the strength or pressure containment of the shoe after a cement job to help ensure that the new hole has been securely isolated from what has been cased off.

What are the applications of injectivity tests?

Applications of Injectivity Tests

What is injectivity index?

The injectivity index is a measure of the well fluid take at a given WHP or reservoir pressure. It is normally measured in tonne/h/bar or kg/s/kPa or kg/s/bar (Grant and Bixley, 2011 ).

What are injectivity test and fall-off Test?

The injectivity test and the fall-off tests are used to estimate the reservoir properties of injection wells in waterflood and tertiary recovery projects. The knowledge of reservoir properties and near wellbore conditions in injection wells is as important as in the producing wells.

What are the tests for well injectivity and step rate?

Injectivity/fall-off and Step Rate Tests These tests are commonly conducted on disposal and injector wells.