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Method used for determining shale-gas multistage-fracturing horizontal-well interior-and exterior-zone dynamic reserves

A technology of dynamic reserves and horizontal wells, applied in construction and other fields, can solve problems such as low permeability of shale matrix, inability to consider the influence of desorption and diffusion of adsorbed gas in shale matrix, and inability to distinguish dynamic reserves in fracturing stimulation areas, etc.

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] When this method is applied to calculate the dynamic reserves of shale gas wells, there are mainly the following problems: first, the influence of the desorption and diffusion of adsorbed gas in the shale matrix cannot be considered when calculating the dynamic reserves of gas wells; Pressure recovery unstable well test to explain the average formation pressure; third, it is impossible to distinguish the dynamic reserves of the fractured stimulation area and the dynamic reserves of the surrounding unfractured stimulation area
[0008] Based on the calculation methods of dynamic reserves of shale gas wells at home and abroad, there is currently a lack of effective and accurate calculation methods for dynamic reserves of shale gas wells, and it is impossible to distinguish the dynamic reserves of the fractured area from the dynamic reserves of the non-fractured area

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  • Method used for determining shale-gas multistage-fracturing horizontal-well interior-and exterior-zone dynamic reserves
  • Method used for determining shale-gas multistage-fracturing horizontal-well interior-and exterior-zone dynamic reserves
  • Method used for determining shale-gas multistage-fracturing horizontal-well interior-and exterior-zone dynamic reserves

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[0072] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0073] The single well control area of ​​multi-stage fracturing horizontal wells in shale gas can be divided into two parts: the fracturing stimulation area (inner area) and the non-fracturing stimulation area (outer area) according to the well pattern spacing. Such as figure 1 Shown is a schematic diagram of the control area of ​​a single horizontal well, the control area includes a fractured stimulation ar...

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Abstract

The invention discloses a method used for determining shale-gas multistage-fracturing horizontal-well interior-and exterior-zone dynamic reserves. The method includes: establishing gas-well binomial productivity equation through gas testing materials, and calculating actual flowing bottomhole pressure (FBHP) through production data and gas-well structure parameters; respectively establishing matter balance equation of a fracturing transformation zone and a non-fracturing transformation zone for a multistage-fracturing horizontal well in considering of adsorption gas desorption and abnormal high pressure influence; respectively setting the dynamic reserves of the fracturing transformation zone and the non-fracturing transformation zone, adjusting the dynamic reserves by combining with the matter balance equation of the fracturing transformation zone and the non-fracturing transformation zone, interporosity flow equation between the fracturing transformation zone and the non-fracturing transformation zone and the binomial productivity equation, and determining the fracturing horizontal-well interior-and exterior-zone dynamic reserves. With the method, testing of average formation pressure by well shutdown is not needed during use, influence of adsorption gas desorption and abnormal high pressure as well as fracturing recombination zones can be considered, and the dynamic reserves of the fracturing transformation zone and the exterior non-fracturing transformation zone can be respectively determined.

Description

technical field [0001] The invention belongs to the technical field of shale gas exploration and development, and in particular relates to a method for determining the dynamic reserves of shale gas in the inner and outer regions of a multi-stage fracturing horizontal well. Background technique [0002] The evaluation method of dynamic reserves of shale gas wells is quite different from that of conventional gas wells, mainly reflected in: (1) The geological characteristics and development techniques of gas reservoirs are different. Shale gas reservoirs are self-generated and self-storage gas reservoirs with extremely low permeability. Volume fracturing is needed to “artificially create reservoirs”. The production and recoverable reserves of gas wells are limited by fracturing, and the dynamic reserves of a single well are related to volume fracturing. . (2) The seepage characteristics are different. Due to the extremely low matrix permeability of shale gas reservoirs, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/003
Inventor 王卫红胡小虎刘华郭艳东杨小松
Owner CHINA PETROLEUM & CHEM CORP
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