A Method and Device for Determining the Height of Liquid Cushion Combined with Perforation Test

Abstract

The embodiment of the present application discloses a method and a device for determining the height of a perforation test combined with a liquid cushion. The method provides the permeability of the target reservoir, the density of the specified liquid injected into the target well that encounters the target reservoir during the perforation test joint process, and the density of the packer set in the target well. Setting depth; the method includes: based on the permeability of the target reservoir, determining the minimum perforation negative pressure of the target well; according to the minimum perforation negative pressure and the density of the specified liquid, determining the a hollowing out depth during the perforation test run; and determining a liquid cushion height during the perforation test run based on the cutout depth and the setting depth. The technical solution provided by the embodiment of the present application can effectively determine the corresponding liquid cushion height for different running depths of the packer during the perforation test joint process.

Description

technical field [0001] The present application relates to the technical field of oil testing and production testing, in particular to a method and device for determining the height of a perforation test combined with liquid cushion. Background technique [0002] With the continuous deepening of exploration in Liaohe Oilfield, the reservoirs in the middle-deep clastic rock exploration area show deeper burial (63% of the oil test intervals with a burial depth of ≥3000m in the whole year), and poor reservoir physical properties (low pressure and low permeability / high pressure and low permeability) etc.), various oil products (thin oil / high pour point oil / heavy oil), resulting in an increase in the oil test cycle. [0003] The combination of perforation and testing can shorten the oil testing cycle. However, currently in the process of joint perforation testing, how to effectively determine the corresponding liquid cushion height for different running depths of the packers is t...

AI Technical Summary

Problems solved by technology

However, currently in the process of joint perforation testing, how to effectively determine the corresponding liquid cushion height according to the different running depths of the packers is temporarily unreasonable.

In this way, the safety and stability of the run-in packer and pipe string will be uncontrollable

For example, when the reservoir depth exceeds 3000m, due to the inability to effectively determine the corresponding liquid cushion height, the stability and safety of the lowered packer and pipe string may not meet the requirements, resulting in joint construction of perforation test may only have a 70% success rate

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