A method for optimizing shale reservoir fracturing pretreatment acid fluid

A shale reservoir and pretreatment technology, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problem of not being able to provide effective methods for the type and concentration of acid fluid in shale reservoirs, and achieve reduction Small construction difficulty and construction risk, the effect of reducing the rupture pressure

Active Publication Date: 2019-11-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] However, none of the previous studies could provide an effective method to optimize the type and concentration of acid fluid suitable for the purpose of shale reservoirs.

Method used

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  • A method for optimizing shale reservoir fracturing pretreatment acid fluid
  • A method for optimizing shale reservoir fracturing pretreatment acid fluid
  • A method for optimizing shale reservoir fracturing pretreatment acid fluid

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Experimental program
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Effect test

Embodiment 1

[0027] Sampling was carried out on shale outcrops in a certain area, and 18 core samples and 1kg of cuttings were obtained.

[0028] 1. First select 6 rock samples, and use X-ray diffraction analysis method to refer to the standards "SY / T 6210-1996 X-ray Diffraction Quantitative Analysis Method for Clay Minerals in Sedimentary Rocks and Common Non-sticky Minerals" and "SY-T 5163- 1995 X-ray Diffraction Analysis Method for the Relative Content of Clay Minerals in Sedimentary Rocks "Analyze the main mineral components and relative content in the rock, and the results are as follows:

[0029] Table 1. Whole-rock analysis and test results of rock mineral content

[0030]

[0031]

[0032] From the results of whole rock experiments, it can be seen that the content of quartz and clay in the sample is relatively high, followed by plagioclase, dolomite, and calcite. The average content of detrital minerals (potassium feldspar and plagioclase) in the six rock samples is 18.9%, a...

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Abstract

The invention provides a method for optimizing shale reservoir fracturing pretreatment acid fluid. The method comprises the steps that a rock sample from a shale reservoir and a plurality of kinds ofacid fluid in different types and different concentrations are provided; corrosion rate data, acidification permeability improved multiple data and tensile strength reduction rate data of each kind ofacid fluid to the rock sample are tested; the fracturing pressure reduction capability of each kind of acid fluid to the shale reservoir is obtained according to the corrosion rate data, the acidification permeability improved multiple data and the tensile strength reduction rate data; and the appropriate acid fluid is selected to serve as the shale reservoir fracturing pretreatment acid fluid according to a fracturing pressure capability reduction result. According to the method, an acid fluid system with the fracturing pressure reduction capability being the highest aiming at the specific shale reservoir can be optimized through a corrosion rate test, an acidification permeability improvement test and a tensile strength reduction test, further the requirements for the power and the bearing capacity of fracturing construction equipment are lowered, and the construction risk is reduced.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for optimizing shale reservoir fracturing pretreatment acid liquid. Background technique [0002] China is rich in shale gas resources, but the storage situation is relatively complicated. China's shale gas formations are deeply buried and have higher overlying rock pressures than those in the United States. Due to factors such as the tightness of shale rocks and the large amount of mud damage during drilling, the fracture pressure of shale reservoirs is usually high. High fracture pressure puts forward higher requirements on the power and bearing capacity of fracturing construction equipment, and there are also certain hidden dangers in construction safety. Based on this consideration, it is necessary to reduce the fracture pressure of shale reservoirs. Therefore, it is very important to select the acid type and concentration suitable for the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 林鑫田西山刘长印李凤霞
Owner CHINA PETROLEUM & CHEM CORP
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