Method for preventing strike-slip fracture slippage in hot dry rock heat storage transformation and application
A hot dry rock and sliding technology, which is applied in the direction of earthwork drilling, wellbore/well components, mining fluids, etc., can solve problems such as induced earthquakes, social panic, endangering residents' lives and property safety, etc. Effects of Friction, Extended Crack Width, Depressed Construction Pressure and Sustained Velocity
Pending Publication Date: 2022-05-10
CHINA PETROLEUM & CHEM CORP +1
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This patent is aimed at a method for the construction of hot dry rock artificial heat storage. The method is to use supercritical carbon dioxide to form cracks, and then generate secondary fractures in large-scale construction. It does not involve the transformation of hot dry rock heat storage to prevent strike-slip fractures. sliding technique
[0007] Due to the high temperature (above 180°C) and strong plasticity of the hot-dry rock mass in the strike-slip fracture, the constant displacement of fresh water is injected for a long time during the fracturing process, so that the construction pressure is always in a state of climbing. When continuous injection of construction pressure or hole When the pressure rises, the stress condition on the fracture reaches the critical pressure of the strike-slip fracture, and the fracture will undergo strike-slip movement, which will induce earthquake events, make the fracturing operation impossible, and even endanger the lives and property safety of residents near the fracturing well. Cause social panic and stagnate the development and utilization of hot dry rock resources
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[0045] The following describes the present invention in detail, and the features and advantages of the present invention will become more clear and definite along with these descriptions. In addition, it should be noted that the various specific technical features described in the following specific embodiments may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, various possible combinations are not further described in the present invention. In addition, various combinations of different implementations of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, the technical solutions formed thereby belong to a part of the original disclosure content of this specification, and also fall into the scope of the present invention. scope of protection.
[0046] One of the objects of the present invention is to provide a method for preventing strike-slip f...
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The invention discloses a method for preventing strike-slip fracture slippage in hot dry rock heat storage transformation and application. The method comprises the steps that (1) clear water is injected in a variable-displacement circulating mode; (2) injecting a first-stage medium-viscosity cleaning polymer fracturing fluid to expand the crack width; (3) injecting a second-stage medium-viscosity cleaning polymer fracturing fluid to expand the crack width; (4) injecting a third-stage medium-viscosity cleaning polymer fracturing fluid to expand the crack width; (5) performing intermittent circulating injection fracturing construction; and (6) the step (5) is repeated, and heat storage transformation construction is completed. The invention relates to a technical method for preventing strike-slip fracture slippage in hot dry rock heat storage transformation. The technical method is suitable for avoiding earthquake events in the strike-slip fracture hot dry rock well fracturing transformation process. By means of the method, the energy intensity in the stratum can be reduced, the earthquake induced by strike-slip fracture slippage is prevented, it is ensured that heat storage transformation construction is conducted safely, and support is provided for efficient utilization of hot dry rock resources.
Description
technical field [0001] The invention belongs to the reformation of hot dry rock thermal storage, and in particular relates to a method for preventing strike-slip fracture slippage during the reformation of hot dry rock thermal storage, and is suitable for avoiding earthquakes caused by strike-slip fault slippage during the reformation of hot dry rock thermal storage. Background technique [0002] Hot dry rock is a kind of high-temperature rock mass buried at a depth of 3-10km, mainly granite, with extremely poor porosity and permeability, and a temperature above 180°C. To realize the conversion of hot dry rock resources into energy, the key is to form a connected heat-conducting fracture network in high-temperature rock mass through thermal storage transformation. At present, the fracturing reconstruction of hot dry rock thermal storage mainly adopts the continuous fracturing construction method with constant construction displacement, and the construction displacement is co...
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Login to View More IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 陈作曾义金许国庆周健吴春方
Owner CHINA PETROLEUM & CHEM CORP