16 results about "Bottom hole pressure" patented technology

This invention relates to the field of exploration and development, and discloses a method, system, and equipment for quantitative analysis of friction resistance in directional drilling. The method includes: acquiring logging information and drill bit speed in the drilled section; constructing a drilling speed prediction model using the drill bit speed and the composite drilling data; determining a bottom hole pressure prediction model based on the directional drilling data and the drilling speed prediction model; combining the bottom hole pressure prediction model with the surface pressure to determine a drill string axial friction resistance model; and calculating the axial friction resistance in the real-time directional drilling process using the drill string axial friction resistance model based on the logging information and drill bit speed. The quantitative friction resistance analysis method disclosed in this application solves the problem of difficulty in accurately assessing bottom hole pressure and axial friction resistance, enabling dynamic assessment of theoretical bottom hole pressure and axial friction resistance. It allows for full-process monitoring and post-drilling analysis of sliding drilling, providing a basis for improving the bottom hole drill string load condition.

This invention discloses a real-time assessment method for bottom-hole pressure in annular multiphase flow driven by both physical models and data, comprising the following steps: S1: Establishing an annular multiphase flow mechanism model; S2: Initializing the annular multiphase flow mechanism model; S3: Calculating the prior estimate of the bottom-hole pressure at the current moment based on the physical parameters of the target well at the previous time step; S4: Calculating the theoretical riser pressure and obtaining the pressure residual; if the pressure residual is less than a threshold, the prior estimate is the final estimation result; otherwise, proceed to step S5; S5: Inputting the pressure residual and the operating characteristics of the target well into a neural network, mapping and outputting the physical parameter correction; S6: Correcting the physical parameters, performing a secondary solution, and obtaining the corrected value of the bottom-hole pressure at the current moment, which is the final estimation result; S7: Repeating steps S3-S6 to obtain the real-time assessment result of the bottom-hole pressure in annular multiphase flow. This invention can quickly and accurately assess the bottom-hole pressure of annular multiphase flow in real time.

This invention relates to a time-varying evolution inversion method for fracture morphology, net pressure, and minimum geostress, belonging to the field of petroleum technology. The method includes: acquiring on-site bottomhole pressure data, monitoring well information, and LF-DAS data during fracturing operations; discretizing the fracture along its length into several units based on the three-dimensional displacement discontinuity method and constructing a net pressure distribution matrix; using a pre-constructed mechanical response relationship between net pressure and fracture width distribution to solve for the fracture width distribution corresponding to the current net pressure distribution; calculating the axial strain response of the fracture at the monitoring well based on the fracture width distribution to form a forward model for pressure-fracture width-strain solution; iteratively updating the fracture half-length and net pressure using the least squares method, constructing a residual between the inverted strain and the on-site strain to minimize the residual, and obtaining the time-varying inversion results for the fracture half-length and net pressure. The time-varying evolution process of minimum geostress can be characterized by the difference between the on-site bottomhole pressure and the inverted net pressure.

This invention discloses a method for determining the production capacity of a coalbed methane (CBM) well without shutting it in. The method includes: acquiring basic data of the CBM well; determining a relationship table between pressure and CBM deviation factor, and a relationship table between pressure and apparent pressure, based on CBM PVT experimental data; recording the daily gas production, bottom hole pressure, and cumulative gas production of the CBM well at each stable flowing pressure test moment during three or more different production stages; determining the formation pressure corresponding to each stable flowing pressure test moment using a mass balance equation; determining the coefficients of the CBM well's production capacity equation based on the formation pressure, bottom hole pressure, and production at each stable flowing pressure test moment, thereby obtaining the CBM well's production capacity equation; and substituting the formation pressure and bottom hole pressure values ​​into the production capacity equation and solving for the corresponding CBM well production capacity. This invention effectively overcomes the shortcomings of traditional well testing methods that require shutting in the well to test formation pressure, and avoids the problem that the applicable conditions of existing non-shutdown methods for determining gas well production capacity equations are difficult to meet.

The application provides a differentiated hole arrangement design method for increasing the number of fracture cracks in a heterogeneous reservoir, and belongs to the technical field of oil and gas exploitation. Reservoir quality parameters, rock mechanics parameters and ground stress parameters of a target well and fracture crack distribution of a neighboring well of the target well are obtained to design the number of fracture cracks / cluster number, position and shape of each cluster of cracks. A mathematical model of the fracture cracks is selected according to the ground stress parameters and the shape of each cluster of cracks to calculate the net pressure required by the shape of each cluster of cracks. A random algorithm is used to determine the displacement of each cluster of cracks and the number of perforation holes, and the friction of each cluster of crack holes is calculated. The bottom hole pressure of each cluster of cracks is calculated according to the net pressure of each cluster of cracks and the friction of each cluster of crack holes, and if the bottom hole pressure of each cluster of cracks is equal, the next step is performed. The ground pumping pressure is calculated by using a fluid mechanics method, and if the ground pumping pressure meets the set conditions, the design is completed. The method can reduce the downhole complex risks such as channeling, improve the fracturing construction efficiency and reservoir reconstruction effect, and reduce the construction cost.

This invention discloses a method, system, storage medium, and equipment for diagnosing communication issues during acid fracturing in fractured-vuggy carbonate reservoirs, belonging to the field of reservoir stimulation technology. The method includes: establishing a bottomhole pressure calculation model; collecting geomechanical parameters, reservoir parameters, communication characteristic parameters during acid fracturing, and fracture-vuggy body parameters from previously stimulated wells in the work area, establishing and training a first neural network model to obtain a prediction model for the communication parameters of fracture-vuggy bodies during acid fracturing; collecting geomechanical parameters and reservoir parameters from the target well, and real-time acquiring the communication characteristic parameters during acid fracturing of the target well to construct a real-time dataset; and substituting the real-time dataset into the prediction model to calculate the communication parameters of fracture-vuggy bodies during acid fracturing. This invention employs integrated monitoring technology and data analysis algorithms, enabling real-time monitoring and diagnosis of communication issues during reservoir acid fracturing, providing a basis for decision-making during construction, and improving construction efficiency and reservoir stimulation effectiveness.

The application relates to the technical field of drilling guide shoes, and discloses a full-crushing plug-in type guide shoe which comprises a sleeve, a guide shoe is arranged in the inside of the sleeve, a base layer is arranged in the inside of the bottom end of the guide shoe, a bottom layer damage layer is arranged in the inside of the base layer, a middle layer damage layer is arranged in the inside of the bottom layer damage layer, and a top layer damage layer is arranged in the inside of the middle layer damage layer. The bottom layer damage layer, the middle layer damage layer and the top layer damage layer are designed to be completely crushed under the action of a roller bit, so that the bottom hole diameter and the flow area are expanded, the increased diameter and the flow channel effectively improve the discharge efficiency of rock cuttings, the risk of bottom hole pressure accumulation is reduced, the mud is smooth in the drilling process, and the overall drilling efficiency is improved.

The application provides a casing pressure control method, and belongs to the field of oil drilling. The application can solve the problems of narrow safe drilling fluid density window, overflow and leakage coexistence, and difficult formation pressure stabilization in a fractured reservoir, and meets the casing safe running requirements. In addition, the "heavy mud cap + gas check" tripping mode can greatly increase the safe operation time, and meets the safe operation time of tripping and conventional casing running well section. Before the casing pressure control, the well mouth is opened, a certain depth of casing string is pre-run in a conventional casing running mode, the casing top can be avoided during the casing running process, and the setting requirement of the centralizer in the key well section is met. The well bottom pressure control method can adjust the well bottom pressure in real time, and realizes the near balance of the well bottom pressure during the casing running process.

The application discloses a kind of well bottom pressure calculation method and device for fracturing construction, wherein the method comprises: comparing the cumulative liquid volume of target well at current time with the preset liquid volume corresponding to well section position, according to the comparison result of cumulative liquid volume, determine the well section position acted by cumulative liquid volume at current time;According to the cumulative liquid volume of target well at current time and the well section position acted, the liquid type, sand concentration and displacement of well section position are found in the corresponding relationship table based on the corresponding relationship table at the same time;According to the liquid type, sand concentration and displacement corresponding to well section position, the corresponding pipe string friction and liquid column static pressure are calculated;According to the casing pressure known at current time, the calculated liquid column static pressure and pipe string friction, calculate the well bottom pressure at current time.The application effectively overcomes the measurement error caused by the dynamic change lag of wellbore liquid distribution in the traditional method, significantly improves the accuracy of well bottom pressure monitoring.

The application provides a multistage fracturing horizontal well multi-well interwell connectivity analysis method and system based on interference well testing, considers uneven fracture distribution and different fracture connectivity states of a shale gas fracturing horizontal well group, establishes a Laplace space multi-well interference well testing analysis model of the multistage fracturing horizontal well based on percolation mechanics and pressure superposition principle, solves the multi-well interference well testing model of the fracturing horizontal well to obtain a Laplace space multistage fracturing well bottom hole pressure solution, carries out numerical inversion on the Laplace space multistage fracturing well bottom hole pressure solution to obtain a real space multistage fracturing horizontal well bottom hole pressure solution, and then uses the real space multistage fracturing well bottom hole pressure solution and measured bottom hole pressure data to carry out fitting inversion to obtain reservoir parameters and fracturing reconstruction parameters. The scheme can overcome the defects of limited application and insufficient operation precision of the prior art, considers the asymmetry and flow conductivity of fractures about the horizontal wellbore in different connectivity states, and is efficient, and gives consideration to calculation stability and timeliness.

This invention belongs to the field of oil and gas resource development technology, specifically relating to a method for evaluating the gas injection capacity of a gas storage facility. The method includes the following steps: 1) Based on a derived binomial theoretical equation for injection capacity; 2) Designing the operating regime and deploying a pressure gauge to measure the bottom hole pressure, obtaining pressure-temperature gradients at different well depths and measurement data for different operating regimes of the injection well; 3) Processing the obtained data and substituting it into the above equation to calculate its coefficients, thus obtaining the injection capacity equation; and 4) Predicting the maximum natural gas injection volume of the corresponding injection well under different formation pressure conditions based on the injection capacity equation. This invention can accurately obtain stable formation pressure data from test wells, predict the gas injection capacity under different formation pressures and injection pressures, and the testing process and analysis methods are simple and easy to implement, providing a basis for site selection for storage facility construction, optimization of the gas injection well network, and selection of optimal injection enhancement measures.

The invention relates to a method for remotely operating a plug assembly (2, 130) in a well, the well comprising a bore (1, 100), the plug assembly (2, 130) being arranged within the bore (1, 100), the method comprising steps of: – performing a sequence of operations on a valve (125) on a wellhead assembly (120) to obtain a sequence of variations of bottom hole pressure within the bore (1, 100); – detecting the variations of bottom hole pressure by at least one sensor (4) on the plug assembly (2, 130); and – responsive to said detecting, operating the plug assembly (2, 130).

This invention provides a method for interpreting conventional well tests in complex reservoirs. The method includes considering permeability variations near the wellbore in a complex region, analyzing pressure recovery curves, calculating the flow coefficient based on shut-in time and bottom-hole pressure in each zone, analyzing the variation trend of reservoir properties around the well based on changes in the flow coefficient, calculating reservoir permeability at different time intervals, amplifying the time interval data to observe the relationship between reservoir properties and time intervals, and obtaining the wellbore reservoir coefficient based on the pressure recovery theory, considering the changes in bottom-hole pressure over time based on shut-in time and time. The method also calculates the pressure recovery rise value based on the wellbore reservoir coefficient and when the test data time intervals are the same. This invention is suitable for reservoirs with water injection, polymer injection, alternating gas and water injection, wellbore contamination, or improved permeability near the wellbore, and is also applicable to the interpretation of well test data from reservoirs with varying rock properties.

The embodiment of the application provides a method, device and storage medium for determining the porosity ratio of a reservoir, and belongs to the technical field of oil and gas development. The method comprises the following steps: obtaining a first relationship curve of bottom hole pressure and pump stopping time, a second relationship curve of bottom hole pressure drop and pump stopping time, a third relationship curve of bottom hole pressure drop derivative and pump stopping time, and a fourth relationship curve of bottom hole pressure and logarithm of pump stopping time; determining a first pump stopping time and a second pump stopping time according to the second relationship curve and / or the third relationship curve; obtaining a straight line segment slope of a straight line segment corresponding to the porosity based on the fourth relationship curve, and according to the first pump stopping time and the second pump stopping time; obtaining a permeability corresponding to the porosity according to the straight line segment slope of the straight line segment corresponding to the porosity; obtaining a bottom hole pressure drop based on the first relationship curve, and according to the first pump stopping time and the second pump stopping time; and determining the porosity ratio according to the permeability and the bottom hole pressure drop. The application can improve the accuracy of determining the porosity ratio of various pores in the reservoir.