Method of determining reservoir pressure

a reservoir pressure and pressure measurement technology, applied in the direction of fluid removal, borehole/well accessories, surveillance, etc., can solve the problems of limited injection rate/volume, careful measurement of pumped volume, etc., and achieve the effect of low permeability

Inactive Publication Date: 2016-01-07
BP CORP NORTH AMERICA INC
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Benefits of technology

[0008]These and other needs in the art are addressed in one embodiment by a method of determining reservoir pressure in a gas well. Embodiments of the method have application in different type of gas reservoirs, but are primarily targeted for use in tight gas and shale reservoirs (e.g. low permeability gas reservoir systems). It is however recognized that the method also may be used in conventional reservoirs (both gas and oil), tight oil, shale oil and coalbed methane reservoirs. In an embodiment, the method initially includes performing a series of injection events with discrete stages, determining the

Problems solved by technology

A small amount of fluid may injected to ensure perforations are open, but careful measurement of volumes pumped a

Method used

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Embodiment Construction

[0035]FIG. 1 is a flowchart depicting an embodiment of a method for determining reservoir pressure. In an embodiment, the method preferably is applied to wells with a new isolated set of perforations 118 in a well has not begun hydrocarbon production. More particularly, fluid may be injected into the well and into the formation 119 in block 10, preferably prior to fracturing or other injection of material into the reservoir. However, it is envisioned that fluid may be injected at any time during the completion or production process into the reservoir. In one embodiment, the fluid injection rate may be limited to injection rates / volumes which minimize the creation of any hydraulic fracture length during the test. The fluid may be any suitable fluid such as without limitation, saline fluid, water, potassium chloride fluid, ionic fluid, non-ionic fluid, or combinations thereof. Gaseous fluids could also be used. All embodiments of the method include injection stages generated by discre...

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Abstract

A well test method for use in tight gas reservoirs prior to hydraulic fracture stimulation. The method can use injection of water using low-rate surface pumps into the reservoir below parting pressure. The measured rates and pressures are converted to sandface rate and pressure datasets for each stage. The technique can utilize either surface or bottom-hole pressure sensors. The resulting sandface datasets are analyzed using the baseline/calibration method or other analysis appropriate to stage data to determine reservoir flow properties. The small-volume, staged well test enables estimation of the flow properties of reservoir, including pressure and permeability, in hours rather than days.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part under 35 U.S.C. §120 of pending U.S. patent application Ser. No. 13 / 327,182, filed Dec. 15, 2011, entitled “Method of Determining Reservoir Pressure,” which claims priority from U.S. Provisional Application Ser. No. 61 / 423,692, filed Dec. 16, 2010. The disclosures of said applications are hereby incorporated herein by reference in their entireties.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.BACKGROUND[0003]1. Field of the Invention[0004]This invention relates generally to the field of exploration and production of hydrocarbons. More specifically, the invention relates to a method of determining reservoir properties in hydrocarbon reservoirs.[0005]2. Background of the Invention[0006]Increasingly, hydrocarbon resource is being developed in low permeability reservoirs. For example, more than 50% of the currently identified gas resources in the United States is...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B43/12E21B47/06
CPCE21B47/00E21B43/121E21B47/06E21B49/008G01V9/02
Inventor ADAMS, JOHN R.MOTEALLEH, SIYAVASHSEBASTIAN, HERBERT M.JIANG, YUANLINDOTSON, BRYAN
Owner BP CORP NORTH AMERICA INC
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