Evaluating method for compressibility of shale reservoir

A shale reservoir and evaluation method technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of evaluation system deviation and inability to quantitatively evaluate shale reservoirs, etc.

Pending Publication Date: 2020-01-21
HUANENG CLEAN ENERGY RES INST
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  • Claims
  • Application Information

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Benefits of technology

This patented technology uses data from various sources like well logs or seismology measurements taken during exploration drilling operations to determine how easily it becomes harder than usual when rocks become compressed due to their own properties that make them more difficult to break down under pressure compared to other types of sedimentary basins found around the world today. By analyzing these physical features over time, this researchers aim to identify areas where there may be potential future hydraulicity issues related to shales' ability to move fluids effectively without being forced into collapse.

Problems solved by technology

This patents describes how shale plays important roles in oil field operations like drilling and completion work. However, current assessments often fail to accurately predict which type of shalybility occurs underground when injecting fluids into formations containing shales.

Method used

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  • Evaluating method for compressibility of shale reservoir
  • Evaluating method for compressibility of shale reservoir
  • Evaluating method for compressibility of shale reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] The Fort Worth Basin is located in the northern part of Texas, USA, with an area of ​​about 38,100km 2 , is a foreland basin formed by the Ouachita orogeny in the late Paleozoic. Barrnet shale gas is a self-generated, self-storage and self-capped packaged unconventional natural gas. Since its development in the 1980s, the Barrnet shale has become the most successfully developed shale gas field in the world. It represents the latest progress in shale gas development and is an important example for reference in shale gas development.

[0123] Well Barrnet X1 was selected as the research object, and the compressibility coefficient of Barnett X1 well section was calculated by the above method. According to the survey, the average rock content of Barrnet X1 well contains 45% quartz, 23.5% carbonate rock, 21.8% clay mineral, and 4.5% other mineral content; the average Poisson’s ratio of the rock is 0.25, and the average Young’s modulus is 0.25. It is 26.8GPa, and the natura...

Embodiment 2

[0129] Drilling in the Weiyuan structure began in 1938. By the end of December 2013, a total of 163 deep wells had been drilled in the Weiyuan structure, and 6 wells were discovered in the Sinian, Cambrian, Ordovician, Silurian, Maokou and Jialingjiang formations. Gas unit. The actual drilling shows that the shale of the Silurian Longmaxi Formation is thick, has good gas content and stable lateral distribution, and the Lower Paleozoic Silurian Longmaxi Formation shale gas has good prospects for exploration and development.

[0130] Well WY1 in Weiyuan shale was selected as the research object, and the compressibility coefficient was calculated by the above method. According to the investigation, the average rock content of Well WY1 in Weiyuan shale contains 45% quartz, 29% carbonate rock, 27% clay mineral, and 4.2% other mineral content; The average value of the modulus is 24.61GPa, the weak surface of the reservoir is well developed, the calculation shows that the in-situ st...

Embodiment 3

[0135] According to the geological parameters of a certain area in Chongqing, the compressibility of the target area was calculated as an example, and the results are shown in Table 6. The results show that the compressibility coefficient of the shale in the ZY1 section of the target well is 0.56, which is equivalent to the above two wells, and the compressibility is better.

[0136] Table 6 Evaluation table of reservoir compressibility coefficient of Well ZY1

[0137]

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Abstract

The invention provides an evaluating method for compressibility of a shale reservoir. The evaluating method comprises the following steps that standardized treatment is conducted on the parameter values of the five factors with different units and different dimensions influencing the compressibility of the shale reservoir by adopting range transformation or empirical assignment to obtain standardized values, wherein the five factors comprise the brittleness index, the brittle mineral content, the natural weak surface, the ground stress difference coefficient and the rock formation effect, theinfluencing weight of the five factors on the compressibility of the shale reservoir is determined by adopting an analytic hierarchy process to obtain the weight coefficient, weighting processing is conducted on the obtained standardized values and the weight coefficient to obtain the compressibility coefficient of the shale reservoir, and evaluating is conducted on the compressibility of the shale reservoir by using the obtained compressibility coefficient. By means of the evaluating method, whether the shale reservoir can be pressurized can be evaluated quantitatively, and an idea and methodare provided for the quantitative evaluation of the compressibility.

Description

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Claims

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Application Information

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Owner HUANENG CLEAN ENERGY RES INST
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