Device and method capable of detecting sealing performance of packers in real time during straddle testing of lower return layer

Abstract

The invention provides a device and method capable of detecting sealing performance of packers in real time during straddle testing of a lower return layer, and belongs to the field of petroleum exploitation. According to the device and the method, a wireless transmitting device is arranged in an annular space between the upper packer and the lower packer, a data receiver is arranged on the innerside of an oil tube between the upper packer and the lower packer, and the data receiver is arranged to be electrically connected with an instrument truck located on the ground; change information ofthe liquid column pressure in the annular space is transmitted to the instrument truck located on the ground in real time so that operators on the ground can judge the sealing performance of the upperpacker and lower packer according to the change information of the liquid column pressure, and accordingly, rectifying is conducted on straddle testing of the lower return layer in time; and the consequences such as testing failure of the lower return layer, delaying of the construction period and cost loss are avoided, one-time success of straddle testing construction is achieved, and the accuracy of all data obtained by a new test layer is ensured.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a device and method capable of real-time detection of the tightness of a packer during the spanning test of a lower return layer. Background technique [0002] In the process of oil and gas well testing, for oil and gas wells with perforated exposed layers on the wellbore, when preparing to go down to the new layer for annular pressure response (annulus pressure responsive, APR) test, it is necessary to test the existing perforated layers first. The exposed layer of the perforated layer is isolated to avoid the influence of the existing perforated layer on the test results of the new perforated layer. [0003] Generally, in the prior art, the spanning test method of double packers is used to isolate the perforated exposed layer to perform APR test on the lower return to the new layer, and during the test, through the Run the test pressure gauge to check the tightness of the two p...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: the prior art cannot detect the tightness of the packer in real time, and only detects the pressure by running the pipe string between the two packers. It is estimated that the tightness of the packer will not be known until the APR test is completed and the pipe string and pressure gauge are pulled out. At this time, the result of the packer’s leak has already formed. Consequences such as layer test failure, delay in construction period, loss of expenses, etc.

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