Application of Two-phase Deviation Factor to Material Balance Calculations For Gas-condensate Reservoirs

Summary The depletion performance of gas/condensate reservoirs is highly influenced by changes in fluid composition below the dewpoint. The long-term prediction of condensate/gas reservoir behavior is therefore difficult because of the complexity of both composition variation and two-phase-flow effects. In this paper, an integrated model was developed to simulate gas-condensate reservoir/well behavior. The model couples the compositional material balance or the generalized material-balance equations for reservoir behavior, the two-phase pseudo integral pressure for near-wellbore behavior, and outflow correlations for wellbore behavior. An optimization algorithm was also used with the integrated model so it can be used in history-matching mode to estimate original gas in place (OGIP), original oil in place (OOIP), and productivity-index (PI) parameters for gas/condensate wells. The model also can be used to predict the production performance for variable tubinghead pressure (THP) and variable production rate. The model runs fast and requires minimal input. The developed model was validated by use of different simulation cases generated with a commercial compositional reservoir simulator for a variety of reservoir and well conditions. The results show a good agreement between the simulation cases and the integrated model. After validating the integrated model against the simulated cases, the model was used to analyze production data for a rich-gas/condensate field (initial condensate/gas ratio of 180 bbl/ MMscf). THP data for four wells were used along with basic reservoir and production data to obtain original fluids in place and PIs of the wells. The estimated parameters were then used to forecast the gas and condensate production above and below the dewpoint. The model is also capable of predicting reservoir pressure, bottomhole flowing pressure, and THP and can account for completion changes when they occur.

Download Full-text

Effects Of Input Data Errors On Material Balance Analysis For Volumetric, Gas And Gas-Condensate Reservoirs

10.2118/93-04 ◽

1993 ◽

Cited By ~ 1

Author(s):

Anil K. Ambastha ◽

J.W. van Kruysdijk

Keyword(s):

Input Data ◽

Material Balance ◽

Gas Condensate ◽

Gas Condensate Reservoirs ◽

Data Errors ◽

Balance Analysis

Download Full-text

wells of gas and gas condensate reservoirs in the South-Eastern part of the Bukhara-Khiva region and methods for increasing their productivity

International journal of chemical & material sciences ◽

10.21744/ijcms.v4n1.1789 ◽

2021 ◽

Vol 4 (1) ◽

pp. 37-42

Author(s):

Khayitov Odiljon Gafurovich

Keyword(s):

Material Balance ◽

Gas Condensate ◽

The South ◽

Reliable Determination ◽

Gas Condensate Reservoirs ◽

South Eastern ◽

Specific Description ◽

Material Balance Method ◽

Volume Method

The article examines the methods of increasing the productivity of wells of gas and gas condensate reservoirs in the south-eastern part of the Bukhara-Khiva region (BHR). The role of gas calculation methods in determining the gas reserve of Mesopotamia in sveza with an increase in the share of gas reserves from 1 to 10 million tons of conventional fuel is shown. Certain difficulties have been identified in the issue of reliable determination of gas reserves in the limited fund of wells and large ranges of changes in calculated parameters. The determining significance of the value of gas reserves in calculating the forecast indicators of the development and technologies of their extraction is justified. It is established that increasing the degree of reliability of calculating gas reserves ensures the efficiency of its extraction, as well as the rational use of material and technical resources and financial capabilities of the enterprise. The advantages of such methods for determining gas reserves as the volume method, the material balance method, and static models are disclosed. A specific description of each of these methods and their application for calculating gas reserves at the Northern Guzar field is given.

Download Full-text