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An example method for performing reservoir engineering includes generating a geological model of a reservoir including a geological horizon, obtaining an offset relative to the geological horizon, and positioning a wellbore equipment item in a well completion design based on the offset. The method f

An example method for performing reservoir engineering includes generating a geological model of a reservoir including a geological horizon, obtaining an offset relative to the geological horizon, and positioning a wellbore equipment item in a well completion design based on the offset. The method further includes calculating an absolute position of the wellbore equipment item in the well completion design based on the offset and a location of the geological horizon in the geological model and updating the geological model to generate an updated location of the geological horizon. The method further includes updating the absolute position of the wellbore equipment item in the well completion design based on the offset and the updated location of the geological horizon and simulating a simulation case including the geological model and the well completion design after updating the absolute position of the wellbore equipment item.

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1. A method for performing reservoir engineering, comprising: generating a geological model of a reservoir including a geological horizon;obtaining an offset relative to the geological horizon;positioning a wellbore equipment item in a well completion design based on the offset;positioning a reservo

1. A method for performing reservoir engineering, comprising: generating a geological model of a reservoir including a geological horizon;obtaining an offset relative to the geological horizon;positioning a wellbore equipment item in a well completion design based on the offset;positioning a reservoir operation relative to the geological horizon in the well completion design, wherein the reservoir operation comprises at least one selected from a group consisting of hydraulic fracturing, an oilfield perforation operation, acidization, a chemical treatment, and a cement squeeze;calculating an absolute position of the wellbore equipment item in the well completion design based on the offset and a location of the geological horizon in the geological model;updating the geological model to generate an updated location of the geological horizon;updating the absolute position of the wellbore equipment item in the well completion design based on the offset and the updated location of the geological horizon; andsimulating a simulation case comprising the geological model and the well completion design after updating the absolute position of the wellbore equipment item. 2. The method of claim 1, further comprising: obtaining a tailored rule;obtaining a parameter for the tailored rule;generating a custom well control by applying the tailored rule to the parameter, wherein the simulation case further comprises the custom well control. 3. The method of claim 2, wherein the tailored rule is defined by a first user and the parameter is submitted by a second user. 4. The method of claim 2, wherein the tailored rule is defined using a native syntax of a simulator for simulating the simulation case. 5. A reservoir engineering system, comprising: a processor;a geological model of a reservoir comprising a geological horizon;a fluid modeling module comprising functionality to generate a visualization showing surfaces of constant composition or saturation pressure from a fluid and rock model of the reservoir;a well completion design module comprising functionality to position a wellbore equipment item in a well completion design based on an offset from the geological horizon and to position a reservoir operation relative to the geological horizon in the well completion design,wherein the reservoir operation comprises at least one selected from a group consisting of hydraulic fracturing, an oilfield perforation operation, acidization, a chemical treatment, and a cement squeeze; anda simulation case module, executing on the processor, operatively connected to the fluid modeling module and the well completion module, and comprising functionality to generate a simulation case comprising the geological model, the well completion design, and the fluid and rock model of the reservoir. 6. The reservoir system of claim 5, further comprising: a rule builder module for defining a tailored rule using native syntax of a simulator;a well controls module operatively connected to the rule builder module and comprising functionality to apply the tailored rule to a plurality of submitted parameters to generate a custom well control,wherein the simulation case module is operatively connected to the well controls module and the simulation case further comprises the custom well control. 7. The reservoir system of claim 6, wherein the tailored rule is defined by a first user and the parameters are submitted by a second user. 8. The reservoir system of claim 5, further comprising: an equipment extension module operatively connected to the well completion design module, storing a wellbore equipment model comprising a description of the wellbore equipment item, and comprising functionality to translate the description into simulator-specific instructions for a simulator selected to run the simulation case,wherein the simulation case further comprises the simulator-specific instructions. 9. The reservoir system of claim 8, wherein the equipment model is a plug-in provided by a vendor of the wellbore equipment item. 10. The reservoir system of claim 5, wherein the geological model comprises a geological barrier identified from the visualization showing surfaces of constant composition or saturation pressure. 11. A non-transitory computer readable medium storing instructions for performing reservoir engineering, the instructions comprising functionality to: generate a geological model of a reservoir including a geological horizon;generate a model of fluid and rock interactions based on a plurality of fluid samples from the reservoir;create a three-dimensional (3D) visualization showing surfaces of constant composition or saturation pressure in the reservoir based on the model of fluid and rock interactions;identify a geological feature from the 3D visualization;add the geological feature to the geological model of the reservoir;obtain an offset relative to the geological horizon;position a wellbore equipment item in a well completion design based on the offset;calculate an absolute position of the wellbore equipment item in the well completion design based on the offset and a location of the geological horizon in the geological model;update the geological model to generate an updated location of the geological horizon;update the absolute position of the wellbore equipment item in the well completion design based on the offset and the updated location of the geological horizon; andsimulate a simulation case comprising the geological model, the model of fluid and rock interactions, and the well completion design after updating the absolute position of the wellbore equipment item. 12. The non-transitory computer readable medium of claim 11, the instructions further comprising functionality to: obtain a wellbore equipment model comprising a description of the wellbore equipment item;identify a simulator for simulating the simulation case; andtranslate the description into simulator-specific instructions for the simulator, wherein the simulation case further comprises the simulator-specific instructions. 13. The non-transitory computer readable medium of claim 11, the instructions further comprising functionality to: obtain a tailored rule;obtain a parameter for the tailored rule;generate a custom well control by applying the tailored rule to the parameter, wherein the simulation case further comprises the custom well control, wherein the tailored rule is defined by a first user and the parameter is submitted by a second user. 14. A method for performing reservoir engineering, comprising: generating a geological model of a reservoir including a geological horizon;obtaining an offset relative to the geological horizon;obtaining a wellbore equipment model comprising a description of a wellbore equipment item;positioning the wellbore equipment item in a well completion design based on the offset;calculating an absolute position of the wellbore equipment item in the well completion design based on the offset and a location of the geological horizon in the geological model;updating the geological model to generate an updated location of the geological horizon;updating the absolute position of the wellbore equipment item in the well completion design based on the offset and the updated location of the geological horizon; andidentify a simulator for simulating a simulation case comprising the geological model and the well completion design;translating the description into simulator-specific instructions for the simulator;simulating the simulation case comprising the geological model and the well completion design after updating the absolute position of the wellbore equipment item,wherein the simulation case further comprises the simulator-specific instructions, andwherein the wellbore equipment model is provided by a vendor of the wellbore equipment and the model provides a generic interface to an attribute and a function of the wellbore equipment item. 15. A method for performing reservoir engineering, comprising: generating a geological model of a reservoir including a geological horizon;collecting a plurality of fluid samples from a plurality of locations in the reservoir;generating a model of fluid and rock interactions from the plurality of fluid samples;creating a three-dimensional (3D) visualization showing surfaces of constant composition or saturation pressure in the reservoir based on the model of fluid and rock interactions;identifying a geological feature from the 3D visualization;adding the geological feature to the geological model of the reservoir;obtaining an offset relative to the geological horizon;positioning a wellbore equipment item in a well completion design based on the offset;calculating an absolute position of the wellbore equipment item in the well completion design based on the offset and a location of the geological horizon in the geological model;updating the geological model to generate an updated location of the geological horizon;updating the absolute position of the wellbore equipment item in the well completion design based on the offset and the updated location of the geological horizon; andsimulating a simulation case comprising the geological model and the well completion design after updating the absolute position of the wellbore equipment item,wherein the simulation case further comprises the model of fluid and rock interactions. 16. The method of claim 15, wherein the geological feature is a geological barrier and the plurality of fluid samples originate from a plurality of fluid systems in the reservoir.