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A technology of coal reservoirs and coal seams, which is applied in the design field of reformed coal reservoirs, can solve problems such as high Poisson's ratio, blocked seepage channels, and low Young's modulus, and achieve the effect of improving efficiency
Inactive Publication Date: 2016-06-29
PETROCHINA CO LTD
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[0005] In the above-mentioned coal reservoir reconstruction method, when the coal reservoir is reconstructed with fracturing fluid, due to the characteristics of low Young's modulus and high Poisson's ratio of the coal reservoir, large displacement liquid and proppant are scoured at high speed during hydraulic fracturing. Coal reservoirs will produce a large amount of coal powder, and the output and migration of coal powder will block the seepage channel, thus making the efficiency of reservoir reconstruction low
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Embodiment 1
[0036] Embodiments of the present invention provide a design method for transforming coal reservoirs, such as figure 1 As shown, the processing flow of the method may include the following steps:
[0037] In step 101, the thickness, effective porosity, radius of phase change modification and phase change modification temperature of the coal reservoir are obtained, and the wellbore heat loss efficiency of the injection well is obtained.
[0038] Step 102, according to the transformation radius of the phase change and the effective porosity of the coal reservoir, determine the amount of the phase change fluid and the spacer fluid, and according to the fracture pressure of the coal reservoir, determine the injection displacement and injection well volume when injecting liquid into the coal reservoir The maximum wellhead pressure.
[0039] Step 103, according to the amount of phase change fluid, the specific heat capacity of the pore medium in the coal reservoir, the density of t...
Embodiment 2
[0043] Embodiments of the present invention provide a design method for transforming coal reservoirs. figure 1 The processing flow shown is described in detail, and the content can be as follows:
[0044] In step 101, the thickness, effective porosity, radius of phase change modification and phase change modification temperature of the coal reservoir are obtained, and the wellbore heat loss efficiency of the injection well is obtained.
[0045] Wherein, the coal reservoir may be any coal reservoir for storing coal, and a plurality of injection wells for injecting liquids such as phase change fluid may be arranged above the coal reservoir.
[0046] In practice, the special structure of the coal reservoir often causes a large amount of coalbed methane (such as gas) to be adsorbed in the coal reservoir, and the permeability of the coal reservoir is usually low, which makes the production capacity of the coalbed methane low. In order to improve To increase the production capacity...
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Abstract
The embodiment of the invention discloses a design method for coal reservoir transformation, and belongs to the field of coalbed methane exploration. The design method comprises the following steps: acquiring the thickness, the effective porosity, the phase change transformation radius and the phase change transformation temperature of a coal reservoir, acquiring a shaft heat loss efficiency of an injection well, confirming a phase change fluid amount and a partitioning fluid amount according to the phase change transformation radius and the effective porosity of the coal reservoir, confirming an injection delivery capacity and the highest pressure of the opening of the injection well when fluid is injected into the coal reservoir according to fracture pressure of the coal reservoir, confirming a cold amount for phase change transformation coal reservoir according to the phase change fluid amount, the specific heat capacity of a pore medium in the coal reservoir, and the density and the phase change transformation temperature of the pore medium in the coal reservoir, confirming a refrigerant amount and a cold source amount according to the shaft heat loss efficiency, the specific heat capacity of a refrigerant liquid and the temperature of the refrigerant liquid after heat exchange with the ground, and transforming the coal reservoir according to phase change of the phase change fluid. By adoption of the design method, the coal reservoir transformation efficiency can be improved.
Description
technical field [0001] The invention relates to the field of coal bed gas exploitation, in particular to a design method for transforming coal reservoirs. Background technique [0002] Due to the special structure of coal reservoirs, a large amount of coalbed methane (such as gas) is often adsorbed in coal reservoirs, and the permeability of coal reservoirs is usually low, which makes the production capacity of coalbed methane low. In order to increase the production capacity of coalbed methane , it is necessary to transform the coal reservoir to increase the permeability of the coal reservoir. [0003] Usually, the main way to increase the production of coalbed methane is to use hydraulic fracturing to transform the coal reservoir. Specifically, through the transmission of liquid to the pressure, a high-pressure pump is used on the surface to inject pressure into the pressure well with a displacement greater than the absorption capacity of the formation. Fracture fluid, be...
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