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A Method for Evaluating Shale Gas Reservoirs Using Compressibility Index

A shale gas and index technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of casing pressure reduction, poor operability and field practical application, and achieve strong operability. The effect of strong on-site practical applicability

Active Publication Date: 2017-09-22
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

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Problems solved by technology

[0004] 2. During the fracturing construction process, as the fracturing continues, the casing pressure will also decrease as the fracturing cracks grow longer
[0007] Although the above-mentioned patent discloses a method for evaluating shale gas reservoirs, there is still a lack of a unified and independent evaluation data to evaluate shale gas reservoirs, and the operability and field practical application are not strong

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  • A Method for Evaluating Shale Gas Reservoirs Using Compressibility Index
  • A Method for Evaluating Shale Gas Reservoirs Using Compressibility Index
  • A Method for Evaluating Shale Gas Reservoirs Using Compressibility Index

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Embodiment Construction

[0032] With reference to the accompanying drawings in the description, the concrete steps of the present invention are as follows:

[0033] 1. Collect fracturing construction parameter data

[0034] 2. Optimal fracturing parameters

[0035] The optimal fracturing parameters are as follows: for each fracturing section, there is an obvious maximum pressure value from the start of the pump to the opening of the formation, which can be directly read P 初最高 . Therefore, the fracture pressure of the formation is known P 破 = P 初最高 + P 储层深度中部液柱压力 , because the shale gas is a horizontal well, the vertical depth of the reservoir has little difference, so the P 储层深度中部液柱压力 is almost a constant value, P 初最高 It can directly reflect the fracture pressure of the reservoir.

[0036] After fracturing the formation, the casing pressure will gradually decrease along with the new fracturing fractures. Therefore, the pressure drop tends to be stable after reading the fracturing paramete...

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Abstract

The invention discloses a method for evaluating shale gas reservoirs by using the compressibility index, which relates to the technical field of petroleum and natural gas exploration and development. The steps are: a. collecting various parameters of fracturing construction; b. fracturing parameters; c. Establish correlation and process the selected fracturing parameters; d. Calculate the fracturing index F by using the processed parameters; e. According to the obtained F (fracturing index), Compare and evaluate shale gas reservoirs. The present invention evaluates the shale gas reservoir by using the compressibility index. Under the current environment of large-scale development of shale gas, the reservoir can be evaluated according to the comparison and selection of fracturing parameters. This method is used as a single data to evaluate the reservoir It has strong operability and field practical applicability.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for evaluating shale gas reservoirs by using compression index. Background technique [0002] In shale production and development, the development degree of fractures is an important factor affecting shale gas production, and fracturing construction is to obtain more artificial fractures, form fracture grids, and obtain higher gas production. Due to the different physical properties and brittleness of different shale reservoirs, during the fracturing process, the fracturing parameters also have corresponding obvious differences and changes, which are mainly manifested in: [0003] 1. In fracturing construction, the most important thing is to pay attention to the fracture pressure. Fracture pressure refers to the pressure when the oil layer breaks or the pressure when the oil layer just begins to absorb water. Generally speak...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/26
Inventor 何嘉唐家琼唐谢李天书刘达贵
Owner BC P INC CHINA NAT PETROLEUM CORP