9 results about "Fracture pressure" patented technology

This invention proposes a method and apparatus for predicting fracture pressure and production classification in tight oil reservoirs, relating to the field of reservoir exploration technology. The method includes: acquiring tight oil horizontal well data; extracting factors affecting fracture pressure from the tight oil horizontal well data, inputting these factors into a tight oil horizontal well fracture pressure prediction model to obtain the fracture pressure; extracting factors affecting tight oil production from the tight oil horizontal well data, inputting these factors into a tight oil production prediction model to obtain the tight oil production; classifying the tight oil horizontal wells according to the tight oil production to obtain tight oil production classification results; and generating a tight oil horizontal well development strategy based on the tight oil horizontal well fracture pressure and tight oil production classification results.

This invention discloses a method and apparatus for accelerating the preheating start-up of SAGD in heavy oil reservoirs. The method involves determining the required volume of a high thermal conductivity material dispersion based on the minimum fracture pressure of the target oil layer; injecting hot water into the cleaned steam injection wells and production wells to pressurize to the minimum fracture pressure of the oil layer and maintaining this pressure for a period of time; intermittently injecting the high thermal conductivity material dispersion into the steam injection wells and production wells until all the high thermal conductivity material dispersion is injected; and performing steam injection circulation preheating start-up on the steam injection wells and production wells containing the high thermal conductivity material dispersion. Through this method, this invention achieves significant improvement in the thermal conductivity coefficient of the formation near the wellbore by injecting a high thermal conductivity material into the microfractures formed by the super-fracture pressure without altering the original SAGD injection-production tubing structure, rapidly establishing a uniform oil drainage channel, reducing the start-up time by more than half compared to conventional steam injection preheating start-up methods, significantly reducing energy consumption, accelerating the transition to SAGD production, and increasing the oil production rate.

The application discloses a rock fracture pressure pre-drilling prediction method, system, medium and equipment. The method comprises data acquisition, generation of a plurality of virtual wells and obtaining wave impedance curves and mineral component curves corresponding to the wave impedance curves, label calculation, model construction and application of a training set model. Through fusion of seismic wave impedance data and mineral component data as joint input, the virtual well generation mechanism is used to solve the bottleneck of actual drilling data scarcity, a special deep learning architecture containing parallel convolution feature extraction and a multi-layer long short-term memory network is constructed, effective fusion of seismic sequence information and mineral component features and accurate capture of long-term dependence are realized, and therefore, under the premise of not depending on actual drilling data, high-precision and strong geology-explainable pre-drilling intelligent prediction of the fracture pressure of the whole well section of the target well is completed, and reliable technical support is provided for well structure optimization and safe density window design of oil and gas drilling.

The application provides a kind of based on multilevel progressive heat storage comprehensive reconstruction method of dynamic-static-flexible, it is related to heat reservoir stimulation technical field.The method comprises the following steps: firstly, based on the original well logging data to establish rock mechanics profile model, obtain parameter set and calculate theoretical fracture pressure;Accordingly, the perforation horizon is optimized, high-energy blasting operation is carried out, and near-well low initiation pressure pretreatment zone is constructed by using shock wave and gas wedge effect;Then, guided by the pretreatment zone, large-displacement hydraulic fracturing is used to construct deep large-volume three-dimensional fracture network;Chemical stimulation medium is injected to form anti-closing fluid conductivity groove on the fracture wall;Finally, the production cycle is constructed, and the closed-loop optimization of operating parameters is realized based on wellhead flowback data.The application solves the problems of deep heat reservoir initiation difficulty, small sweep range and fracture closure difficulty through the synergistic effect of "dynamic" fracturing pressure reduction, "static" fracturing capacity expansion and "flexible" etching guide, and realizes the efficient development and long-term stable production of geothermal resources.

This invention relates to the field of mine safety and rock strata control technology, specifically to a safe decompression method for long-bore directional hydraulic fracturing in hard rock strata. First, based on the geological conditions, geostress, and mechanical parameters of the target hard rock strata, the design parameters for the long directional borehole are determined. Then, directional drilling combined with a drilling-while-guided system is used to ensure precise borehole positioning within the target rock strata. A segmented isolation device is lowered to form a high-pressure sealed chamber. According to the design parameters, a retreating fracturing process is used to fracture segment by segment, initiating fractures and extending them to the far field. Finally, the fracturing effect is verified through real-time monitoring to complete safe decompression. This invention is a spark-free, low-vibration static operation with no toxic gas generation, ensuring high safety. It can transform the overall impact collapse of rock strata into a layered, small-step, stable collapse, resulting in excellent fracturing control. The use of multi-segment fracturing within a single borehole reduces drilling site and equipment relocation, lowers treatment costs, and is suitable for decompression treatment of hard rock strata in underground coal mines, ensuring safe mine production.

This specification relates to the field of hydraulic fracturing technology for oil and gas reservoirs, and more particularly to a method and apparatus for simulating fracture propagation. The method includes: discretizing a fracture domain containing fractures; determining the fracture width of discrete elements in the fracture domain using Newton's method iteratively based on an analytical expression of a fracture width function and a Jacobian matrix, wherein the fracture width function is obtained by embedding the fracture pressure equation into the fluid flow equation; calculating the tip stress intensity based on the fracture width of the discrete elements at the leading edge of the fracture domain; activating adjacent discrete elements in the fracture tip extension direction if the tip stress intensity satisfies the fracture propagation condition; and updating the fracture geometry in the fracture domain based on the activated adjacent discrete elements. The embodiments in this specification can improve the simulation accuracy and computational efficiency of fracture propagation simulation.

This invention discloses a method for weakening coal seams through hydraulic fracturing. A directional drilling rig is used to drill a hole perpendicular to the working face in the haulage or auxiliary haulage roadway. A packer and fracturing rod are then placed into the hole. After the packer and fracturing rod are lowered to the bottom of the hole, the fracturing rod is connected to a pulse pump. Once the pipeline is connected, the pulse pump is started. The pump is stopped after the designed fracturing time is reached, and the fracturing rod is then withdrawn 2-5 meters outwards for another fracturing operation. This process continues until fracturing reaches near the borehole opening, completing the fracturing of one borehole. This fracturing cycle is repeated. During the fracturing process, monitoring equipment is used to monitor the fracturing flow rate and fracturing pressure in real time. This short-distance, high-frequency fracturing method allows for more than 60 fracturing operations per borehole. Therefore, the accompanying packer is a high-pressure resistant and fatigue-resistant packer that can be reused multiple times.

This invention relates to the field of coal mine rockburst prevention and rock mechanics control technology, specifically to an intelligent stationary hydraulic fracturing and pressure relief system and method for deep roadways based on active blocking of stress-induced disaster links. The system includes the following steps: S1, installing a fracturing tube, a sealing capsule, and a stress sensor in a deep borehole to collect borehole wall pressure and generate stress gradient and peak migration results; S2, identifying the stress evolution trend based on the results, determining the risk core area and target fracturing section; S3, generating fracturing parameter control results based on the target fracturing section and forming fracturing control commands; S4, implementing borehole sealing and high-pressure fracturing to form a fracture zone according to the commands, and comparing and verifying the pressure before and after fracturing. If the requirements are not met, updating the parameters and reinforcing fracturing. This invention achieves accurate identification and active blocking of stress-induced disaster links in deep surrounding rock, thereby improving the real-time performance, accuracy, and reliability of the pressure relief process.

The application discloses a combined well arrangement method of surface vertical shaft and underground horizontal well, comprising the following steps: determining vertical shaft estimated fracturing information and horizontal well estimated fracturing information according to obtained fracturing construction information of surrounding mines; obtaining the width of a working face to be mined and the lateral mining crack range of a mined working face; determining vertical shaft construction information according to the width of the working face to be mined, the lateral mining crack range and the vertical shaft estimated fracturing information; performing fracturing construction on thick and hard roof based on the vertical shaft construction information to obtain a vertical shaft fracturing range; determining horizontal well construction information according to the horizontal well estimated fracturing information and the vertical shaft fracturing range; and performing fracturing construction on a main rock stratum of impact based on the horizontal well construction information; the multiple surface vertical shafts are divided into at least two vertical shaft groups arranged along the tendency of the working face to be mined; the combined well arrangement method can perform omnidirectional fracturing pressure relief on thick and hard roof of an ultra-long working face, and realizes the cooperative prevention and control of rock burst and mine earthquake disaster.