Method for determining single-well dynamic reserve of non-conventional oil and gas reservoir multi-section fracturing horizontal well

Abstract

The invention discloses a method for determining the single-well dynamic reserve of a non-conventional oil and gas reservoir multi-section fracturing horizontal well. The method includes the followingsteps of collecting basic parameters of an oil and gas reservoir, obtaining a well testing double-logarithmic curve through a well testing method, obtaining the first radial flow ending time, the second linear flow ending time and the stratum fluid pseudo-stable flowing time from the well testing double-logarithmic curve, calculating the non-crack section flowing time of stratum fluid on a shorthalf shaft and the non-horizontal well section flowing time of the stratum fluid on a long half shaft, calculating the short half shaft of a multi-section fracture horizontal well elliptic flow drainage area and the long half shaft of the multi-section fracture horizontal well elliptic flow drainage area through a formula, calculating the single-well flow drainage area of the oil and gas well, andfinally calculating the single-well dynamic reserve of the non-conventional oil and gas well through the data. By means of a modern well testing explanation method, the single-well flow drainage areaof the oil and gas well is obtained; in combination with a volume method formula, the single-well dynamic reserve of the non-conventional oil and gas well can be better, more conveniently and more accurately calculated.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, in particular to a method for determining the dynamic reserves of a single well in a multi-stage fracturing horizontal well in an unconventional oil and gas reservoir. Background technique [0002] With the ever-increasing demand for oil and gas resources and the increasing pressure on oil and gas resources, some unconventional oil and gas reservoirs that are difficult to develop (such as tight sandstone oil and gas reservoirs, shale gas reservoirs, multi-media carbonate gas reservoirs, etc.) more attention. Unconventional oil and gas reservoirs are rich in resources, and the total global unconventional oil resources reach 4495×10 8 t, equivalent to the total amount of conventional oil reservoir resources. Global unconventional natural gas reserves are much higher than conventional natural gas reserves, reaching 8 times the scale of conventional natural gas resourc...

AI Technical Summary

Problems solved by technology

The production decline analysis method has the following defects: (1) In the early stage of oil and gas well production, the production of oil and gas wells does not necessarily decrease with time, but may increase instead, so this method cannot be used to calculate the dynamic reserves of a single well in the early stage of oil and gas well production; (2) The production decline analysis method is used to fit the relationship curve of production change with time, which requires a large amount of historical data for fitting analysis. In the actual production process of oil and gas fields, the flow-time data of many oil and gas wells have poor regularity, and the reliability of the single well dynamic reserves determined from this is poor.

The trial and error method has the following defects: (1) The data of many wells provided by oil and gas fields are of poor quality, and it is difficult to obtain the dynamic reserves of a single well by matching with production

(2) For the production of unconventional oil and gas reservoirs, there is no stable working system, and it is impossible to perform trial and error fitting of single well dynamic reserves

[0004] In short, due to the poor quality of oil and gas well data and no stable working system in unconventional oil and gas reservoirs, the above methods cannot be used to obtain reasonable single well dynamic reserves.

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