Techshore Institute Blogs about Best Technical and Management Courses: TECHSHORE INSPECTION SERVICES : WELL TESTING

WELL TESTING

More and more importance is being placed upon efficient performance of oil and gas wells. Generally some kind of testing should be done to determine the performance of an oil or gas well . There are many types tests ,to check certain parameters about the well. Many tests are done often and some are done rarely.

Some of the well tests are simple and some are complicated .Standard production equipments are only needed for many tests, but special equipments are required for others. These tests are to be done carefully because the results reflects the health of the well. These tests are done for the company to plan proper production procedures and to meet regulatory requirements . It is very important that the test be done accurately since well test data documents the performance of a well and the reservoir in which the test is completed . Very often these tests are performed by the producer to help in establishing proper production practices and to comply with regulatory requirement .

There are many types of well tests done by lease operators , well testers, or specialist companies. Most commonly used well tests are discussed below.

DRILL-STEM TEST

When well is being drilled ,a drill- stem test is often run on a formation of unknown performance to determine if a formation contains oil , water , gas , or a combination of the three .

These testing require special tools and packers which have to be run through the drill pipe to isolate the problem areas. Fluid is then allowed to flow from the formation to pass through the tester to the drill pipe. Fluid is then collected in a system of valves in the tester which is then collected for further examination. If there is sufficient pressure to cause the flow to the ground level, then productivity and capacity can be assessed.

Up This procedure requires special tools and packers to be run on the drill pipe to isolate the interval to be tested .Fluid is thus allowed to flow from the formation ,through the tester, and finally to the drill pipe . Fluid which is trapped in the drill pipe is collected by the system valve and its taken for further testing. If the formation pressure is sufficient to cause flow to the surface , a sustained flow test through the drill pipe will provide a measure of the productivity and capacity of the interval tested.

The test result shows the bottom hole shut- in pressure , bottom – hole flowing pressure,and bottom-hole temperature, and the type of fluid in the well might be capable of producing .

The result of drill-stem tests on a well will often h if a casing string should be run to complete the well as a producing well , or if the well is a dry hole .This information is used as the design basis for a production system .

POTENTIAL TEST

In potential test output of a well for a day (24 hrs) is measured in rigid conditions. This test is done one very newly completed well. Sometimes this test is repeated when state or federal regulatory agency or the well-operator needs a potential report.

PRODUCTIVITY TEST

Productivity tests are made on both oil and gas wells and include the well potential and bottom-hole pressure tests .

Flow from reservoir to the well is caused by the pressure difference.High pressure in the reservoir will force the fluid to flow to the low pressure area in the well. Flow rate is proportional to the pressure difference..

During productivity test shut in pressure of the bottom hole is measured first .This pressure is known as the static/reservoir pressure.The well is then tested in different stable rates and the bottom pressures are carefully recorded.From this data an engineer can calculate the output from the well.In gas wells the output potential is determined by measuring the atmosphearic pressure at the well mouth and the gas output..

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Techshore Institute Blogs about Best Technical and Management Courses

Monday, January 2, 2017

TECHSHORE INSPECTION SERVICES : WELL TESTING

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