215 results about "Bottom hole pressure" patented technology

The invention discloses a deepwater well drilling overflow early warning device and method, and relates to the technical field of petroleum engineering, the deepwater well drilling overflow early warning device comprises a data acquisition module, an environment compensation module, a data processing module, a data processing module and a data processing module, the data acquisition module is used for acquiring data during well drilling, and the data comprises underground bottom hole pressure, temperature, acoustic logging data, gamma logging data, underwater gas content data and overwater well fluid flow data; the environment monitoring module is used for monitoring environment changes and dynamically correcting data acquired by the data acquisition module by applying a real-time correction algorithm based on a neural network, and the data processing and analyzing module is used for cleaning the data of the data acquisition module, extracting features and transmitting the features to the early warning system module. Accurate environment data are obtained through the environment compensation module, the data are processed through a real-time correction algorithm, the influence of external interference such as water flow fluctuation and temperature change on sensor reading can be eliminated, and therefore the accuracy and reliability of the data are improved.

The invention discloses a while-drilling pressure monitoring and regulating device for a complex fractured reservoir, and relates to the technical field of well drilling automatic control, and the while-drilling pressure monitoring and regulating device comprises a data acquisition module which comprises a micro-resistivity imaging logging device and a well drilling data acquisition device; the micro-resistivity imaging logging device is used for acquiring well wall imaging data to obtain crack characteristic parameters; the drilling data acquisition device is used for acquiring operation parameters in the drilling process; the data analysis module is used for evaluating the total fracture pressure, calculating the pressure gradient while drilling and constructing a seepage model to obtain the fracture flow according to the fracture characteristic parameters and the operation parameters; and the self-adaptive control module is used for calculating the optimal bottom hole pressure according to the fracture flow in combination with the operation parameters, and controlling the pressure while drilling based on the optimal bottom hole pressure. Real-time evaluation of the fracture pressure state and self-adaptive regulation and control of the bottom hole pressure can be achieved, and the safety of the drilling process is effectively improved.

The invention provides an analysis method for multi-cluster fracturing crossing in a horizontal well section of a sand shale reservoir, which comprises the following steps of: based on a boundary element theory, considering three-dimensional fracture stress interference and flow distribution of each cluster, and establishing a full-three-dimensional fracture propagation numerical model of segmented multi-cluster fracturing stress interference and flow distribution of a tight gas horizontal well; coupling the wellbore flow model and the crack propagation numerical model through bottom hole pressure to obtain a coupling model; based on a three-dimensional boundary element theory, aiming at the coupling model, discretizing different fracture forms into rectangular units, and establishing a three-dimensional boundary element stress interference calculation model through a superposition principle; under the condition that geological factors are kept constant, the influence of different construction parameters on crack propagation and layer crossing behaviors is analyzed, a crack layer crossing main control factor is obtained, and the conditions and boundaries of segmented multi-cluster fracturing layer crossing of the sand-mud interbed horizontal well are determined. The method provides a basis for optimization of crack parameters and construction parameters.

A method of detecting one or more well interference events at a well penetrating a reservoir in a subterranean formation is provided. The method includes: receiving wellhead pressure and flowrates of oil, gas, and water for the well during production; calculating a bottom hole pressure (BHP) of the well based on the wellhead pressure and flowrate of oil, gas, and water; calculating an average reservoir pressure based at least on the BHP; determining a productivity index (PI) for the well for a plurality of time steps based at least on the average reservoir pressure; determining a dataset of PI values and corresponding cumulative fluid production values from the well; analyzing the dataset to determine one or more breakpoints in a relationship between PI and cumulative fluid production representing one or more well interference events; and producing fluids from the reservoir based at least on the one or more breakpoints.

The invention relates to the field of geothermal well drilling, and discloses a gas lift reverse circulation well drilling method, which comprises the following steps of: determining formation pore pressure based on the height of a static water level in a well; setting the annulus bottom hole pressure to be equal to the formation pore pressure, and determining the reference dynamic water level height of the drilling fluid according to the annulus bottom hole pressure, the relevant parameters of the gas lift reverse circulation drilling equipment and the relevant parameters of the drilling fluid; based on the reference dynamic water level height, a first target dynamic water level height is determined, in the drilling process, the dynamic water level height of the drilling fluid is controlled to be the first target dynamic water level height, and the first target dynamic water level height is lower than the reference dynamic water level height. By controlling the dynamic water level height of the drilling fluid in the drilling process to be lower than the corresponding reference dynamic water level height when the annulus bottom hole pressure is equal to the formation pore pressure, the annulus bottom hole pressure can be controlled to be lower than the formation pore pressure, the drilling process is kept in an unbalanced state, the drilling fluid can be prevented from leaking into the formation, and the drilling efficiency is improved. The heat storage is damaged.

The invention discloses a method for evaluating the crude oil utilization rate during shale oil in-situ heating modification exploitation, and is applied to the field of oil development. The method comprises the following steps: (1) constructing a three-dimensional grid model of shale oil reservoirs between two horizontal wells, and determining parameters such as initial temperature, initial fluid pressure, initial porosity, initial oil saturation, initial gas saturation, initial water saturation and initial dissolved gas volume of three-dimensional grid units of each reservoir; (2) determining the pressure of each reservoir three-dimensional grid unit when the fluid pressure is balanced according to the shale oil layer section bottom hole pressure and the reservoir displacement pressure gradient; (3) according to the characteristics of a temperature field, a pressure field and the like of the in-situ heating shale oil reservoir, obtaining three-dimensional grid unit temperature and instantaneous fluid pressure parameters of each reservoir, and determining porosity and fluid saturation at each time point; and (4) according to the instantaneous fluid pressure and the balanced fluid pressure of the three-dimensional grid unit of each reservoir, determining the oil, gas and water production quantity and the production rate of the grid unit of each reservoir in combination with the oil, gas and water saturation.

The invention provides a shale oil well pressure recovery well test interpretation method and device and electronic equipment.The method comprises the steps that effective well shut-in pressure test data and well entering time of a pressure gauge are obtained, the effective well shut-in pressure test data are well bottom pressure data after well shut-in and after the pressure gauge is lowered to the target test depth away from a well opening, and the well entering time is obtained; the well entering time is the time required for lowering the pressure gauge to a target test depth from a well mouth after the well is closed; obtaining well shut-in starting time and a pressure gradient in a well entering process of the pressure gauge; according to the pressure gradient, fluid pressure data at the well shut-in starting time and the target test depth from the well mouth are calculated to serve as supplementary pressure data; according to the effective shut-in pressure test data, the well entering time and the supplementary pressure data, a complete pressure recovery well test curve is determined; and on the basis of the complete pressure recovery well test curve, pressure recovery well test interpretation is carried out. According to the method, the problem of data missing in the early stage of well shut-in testing can be solved, the integrity of a pressure recovery well testing curve is guaranteed, and the accuracy of pressure recovery well testing interpretation is improved.

The invention relates to the field of petroleum and natural gas extraction, and discloses a self-adaptive temporary plugging agent for plugging irregular holes and a preparation method and application thereof. The temporary plugging agent comprises a flexible material and a ductile material layer wrapping the flexible material. Wherein the tough material layer is made of polyurea, and the thickness of the tough material layer is larger than or equal to 0.5 mm. The temporary plugging agent is of a double-layer structure which is soft inside and tough outside, the inner layer is made of a flexible material and can deform easily, the outer layer is made of a tough material, the bottom hole pressure is within the compressive strength of the temporary plugging agent, and a tough material wrapping layer can deform sufficiently along with the flexible material of the inner layer and cannot be damaged.

The invention provides a horizontal well temporary plugging fracturing effectiveness evaluation method based on data driving, which comprises the following steps: (1) collecting geomechanical parameters and fracturing transformation parameters, analyzing the correlation with temporary plugging boosting pressure by utilizing a Pearson's correlation coefficient method, and establishing a temporary plugging boosting prediction model; (2) determining the initial displacement of a perforation cluster, establishing a pressure balance equation, optimizing the instantaneous displacement, and calculating a displacement distribution variable coefficient; (3) according to the relation between the hole friction resistance and the displacement, the hole temporary plugging efficiency is defined, and hole changes before and after temporary plugging are evaluated; (4) carrying out clustering analysis on the bottom hole pressure curve by applying dynamic time warping (DTW) and a K-Means algorithm, and identifying the shape of the bottom hole pressure curve; and (5) establishing a grading table, determining the weight of each characteristic parameter through an expert grading method, calculating a comprehensive score, and evaluating the temporary plugging fracturing effect according to the grading table. According to the method, multiple parameters and algorithms are comprehensively used, accurate evaluation of the temporary plugging fracturing effect is achieved, a scientific tool is provided for evaluation of the effect of temporary plugging operation in oil and gas reservoir horizontal well staged fracturing, the horizontal well temporary plugging fracturing technology can be optimized, and the oil and gas well productivity can be improved.

The invention provides a method and a device for predicting a steam cavity in steam flooding by using an overlap factor, and belongs to the technical field of oil field oil extraction. The method comprises the following steps: determining an incidence relation between wellhead production characteristics of a first production well and a well bottom average temperature value, and determining a well bottom average temperature value of a second production well according to wellhead production characteristics of the second production well by utilizing the incidence relation; determining overlap factors of different displacement layer sections of the first production well; weighting the well bottom average temperature value of the second production well by using the overlay factor of each displacement layer section, and obtaining the well bottom correction temperature of each displacement layer section in the second production well in a one-to-one correspondence manner; and comparing the well bottom correction temperature of the second production well with the well bottom temperature of the steam injection well in the well group where the second production well is located, comparing the well bottom pressure of the second production well with the well bottom pressure of the steam injection well, and identifying the steam cavity of each displacement layer section of the second production well. By means of the method, rapid, accurate and low-cost recognition of the steam cavity is achieved.

The invention discloses a method for diagnosing parameters of a deep fractured reservoir based on distributed optical fiber temperature measurement data. The method comprises the following steps: acquiring actually measured bottom hole temperature and pressure data of the deep fractured reservoir by using a distributed optical fiber sensor; obtaining approximate analytic solutions of the bottom hole pressure at the early stage and the later stage of reservoir production; constructing a reservoir production early stage heat transfer model, and obtaining an approximate analytic solution of the production early stage bottom hole temperature; constructing a reservoir production later-stage heat transfer model, and obtaining an approximate analytical solution of the bottom hole temperature in the production later-stage; establishing a deep fractured reservoir parameter diagnosis method by using the bottom hole temperature approximate analytic solutions at the early stage and the later stage of production and the bottom hole pressure approximate analytic solutions at the later stage; and according to the actually measured bottom hole temperature and pressure data of the reservoir and a reservoir parameter diagnosis method, determining solved values of the reservoir parameters. The method provided by the invention is simple and easy to understand, has strong operability, and can improve the diagnosis efficiency of the deep fractured reservoir parameters.

The invention discloses a coal bed gas horizontal well energy increasing and well repairing method. The method comprises the following steps that S1, basic data of a well are collected, and production data of the well are analyzed; s2, configuring an extra-low pressure energizing well repair scheme; s3, a ground process of a continuous pipe nitrogen foam sand washing process; s4, nitrogen foam well washing is carried out; s5, circulating liquid desanding is conducted till the sand content meets the preset condition, and well repairing is ended. The method is suitable for the technical field of unconventional gas field development, nitrogen is injected into a production layer to increase energy, the well bottom pressure is increased, nitrogen foam well flushing fluid with certain viscosity is adopted as well flushing fluid, the density of the nitrogen foam well flushing fluid is designed according to the well bottom pressure, and the well flushing efficiency is improved; a normal circulation channel is established, solid particles in a shaft are discharged out of the shaft, perforation blast holes are dredged at the same time, the effects of purifying the shaft and improving gas production and water production are achieved, a tubular column is fixed, operation under pressure can be achieved, and production halt and operation time can be greatly shortened.

The invention provides a shale gas well inter-well pressure channeling identification method, system, device and medium, the shale gas well inter-well pressure channeling identification method comprises the following steps: carrying out well test analysis in a pump stop pressure drop stage after fracturing, and collecting data; the bottom hole pressure is calculated, and pressure data oscillation caused by the water hammer effect is eliminated; drawing a pressure difference and pressure difference derivative double logarithmic curve based on the bottom hole pressure data; establishing a shale gas well non-uniform fracture multi-zone coupling well test seepage model; the model parameters are adjusted, a pressure difference and pressure difference derivative double logarithmic curve is fitted, and when the model result is close to the drawn pressure difference and pressure difference derivative double logarithmic curve, the crack parameters of the model parameters are obtained through inversion; judging whether the crack parameter is too high or not; and determining the relationship between the child well group and the mother well group, analyzing the pressure difference and pressure difference derivative curve morphological characteristics of the fracture parameter high section, and judging whether pressure channeling occurs or not. The system can realize the method. According to the method, the inter-well pressure channeling identification efficiency in the well group synchronous fracturing period can be improved.

The invention relates to a method for treating shale oil crack wall surfaces by using carbon nanotubes to increase the heat transfer capacity of a reservoir, a plurality of horizontal wells are drilled from the ground, the horizontal sections of the horizontal wells form three parallel well rows, the uppermost well row and the lowermost well row are heating wells, and the middle well row is a production well. The fracturing fluid carrying the proppant is injected into the heating well and the production well with the displacement greatly exceeding the stratum absorption capacity, the bottom hole pressure is larger than the stratum fracture pressure, hydraulic fracturing is carried out, a tensional fracture area and a communication well group are generated, and meanwhile it is guaranteed that fractures are not closed after the proppant is filled. Under the condition that the pressure is lower than the formation fracture pressure, a weak acid solution is slowly squeezed into the heating well and the production well, the well wall and the crack wall face are treated, and a large number of corrosion micropores are formed. And under the condition that the pressure is lower than the stratum fracture pressure, a weak acid solution added with the carbon nano tubes is squeezed into the heating well and the production well, so that the carbon nano tubes are adsorbed or filled in the corrosion micropores, and the micropores where the carbon nano tubes are attached are formed. And high-temperature steam is circularly introduced into the heating well and the production well to heat the oil shale stratum. After heating for a certain time, stopping steam injection of the production well, and changing into production; and continuously injecting steam into the heating well. The method is suitable for an oil shale underground in-situ conversion exploitation technology, and is also suitable for geothermal exploitation and heavy oil thermal exploitation.

The invention relates to the technical field of multi-layer commingling production, and discloses a multi-layer commingling production interlayer interference mechanism calculation method for different types of gas reservoirs, which comprises the following steps of: constructing a single-layer dimensionless mathematical model for respectively representing each reservoir of a commingling production well, and solving a bottom hole pressure solution of the corresponding model; the known gas production rate of the commingled production well is input into the model, and a theoretical well bottom pseudo-pressure value is calculated through the superposition principle; performing historical fitting on the actual well bottom pseudo-pressure value and the theoretical well bottom pseudo-pressure value of each reservoir to obtain characterization parameters; calculating to obtain the predicted gas production rate of the corresponding model in combination with the characterization parameters, and summing the gas production rate of the commingled production well; the abscissa material equilibrium time, the ordinate regularization yield and the calculation formula of the Blasingame curve are obtained, and the gas production rate of the commingling production well is obtained through calculation; according to the obtained gas production rate of the commingled production well at the current time step, determining the influence of the reservoir interference between the obtained gas production rate of the commingled production well during multi-layer commingled production and the gas production rate of the commingled production well obtained through summation.

The invention discloses a horizontal well fracturing temporary plugging agent capable of reducing the usage amount of a bridge plug and a temporary plugging method. The temporary plugging method comprises the steps that perforation is conducted on a target fracturing section of a horizontal well, and pump injection construction is conducted; judging the number of perforations opened in the target fracturing section; the pump injection displacement is reduced to a first threshold value, and a rope knot temporary plugging agent is added; judging the temporary plugging effectiveness; and if temporary plugging succeeds, the pump injection displacement is increased to a second threshold value, and pump injection construction continues to be conducted. According to the temporary plugging method, the problems that perforation crack initiation is not uniform and the construction efficiency of the packer is low can be effectively solved, and a new thought is provided for engineering application of staged fracturing of the horizontal well; and the temporary plugging agent can be used for continuously plugging under the condition that the bottom hole pressure is reduced, the perforation cluster opening rate is improved, the operation time is shortened by replacing a bridge plug, and the construction efficiency is improved.

The invention relates to a pressure-controlled drilling formation pressure calculation and control method and system based on multi-field coupling, and belongs to the field of oil exploration and development. The method comprises the steps that 1, an industrial personal computer is connected with a logging instrument, and basic data needed by calculation are obtained in real time; 2, shaft-stratum space domain grids are divided, and drill rod and annulus temperature distribution and stratum temperature distribution at different distances from a borehole are calculated; 3, considering the thermal-fluid-solid multi-field coupling influence, and calculating well circumference stresses at different well depth positions in elastic-plastic regions; 4, solving a real-time formation pore pressure profile after multi-factor coupling correction; 5, calculating real-time stratum fracture pressure profiles and collapse pressure profiles at the well walls at the different well depth positions after multi-factor coupling correction in the elastic-plastic areas; and 6, determining a bottom hole pressure control standard, calculating in real time based on a shaft hydraulic parameter calculation model, and controlling the wellhead back pressure in real time through an industrial personal computer. The method can effectively improve the calculation precision of the formation pressure during the pressure-controlled drilling period.

The invention relates to an intelligent pressure control system and method based on a gas cut pressure pulse, and belongs to the technical field of oil and gas drilling, the method comprises the following steps: firstly, acquiring drilling wellhead pressure pulse detection data, pressure control drilling data and a safety pressure additional value, constructing an input vector, and inputting the input vector into a formation pressure prediction model, the formation pressure prediction model is obtained by training a long short-term memory network, adjacent well historical pressure control drilling wellhead pressure pulse detection data and adjacent well historical pressure control data; the predicted formation pressure under the current pressure control condition is obtained, and whether gas cut occurs or not is judged according to the relation between the predicted formation pressure and the bottom hole pressure; finally, if gas cut occurs, predicting the gas cut position according to wellhead pressure pulse detection data, and adjusting a pressure control scheme; based on the method, the formation pressure can be predicted in real time by detecting the real-time wellhead pressure pulse, and the problem that traditional gas cut recognition and formation pressure prediction are poor in precision and real-time performance can be solved.

A method comprises retrieving attributes of a blowout well and a relief well and simulating a dynamic kill of a blowout from the blowout well via a kill mud pumped down through the relief well, wherein the simulating comprises determining a flowing bottom hole pressure for the blowout well and the relief well based on an intersection of a reservoir inflow performance relationship (IPR) curve and a wellbore vertical lift (VLP) curve.

The invention discloses a gas lift reverse circulation bottom hole pressure prediction method. The method comprises the steps that regional grid division is carried out; calculating unit parameters; determining an iterative calculation position; and outputting bottom hole pressure. The gas lift reverse circulation drilling technology is one of typical shaft bottom negative pressure drilling technologies, and the technology can greatly reduce shaft circulation pressure consumption, reduce the shaft bottom hold-down effect and effectively reduce the probability of well leakage. The invention aims to deduce a calculation method for predicting the gas injection point pressure and the bottom hole pressure under the gas lift reverse circulation, which provides important reference for predicting the bottom hole pressure and preventing well leakage, and has important significance for the development of the gas lift reverse circulation 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.

The invention relates to the technical field of drilling engineering, and discloses a method, device and equipment for controlling pressure and downloading an instruction while drilling, according to the method, a well bottom pressure negative fluctuation of a downloading instruction while drilling is balanced in a mode of constructing a well mouth back pressure real-time prediction model of a target area and calculating real-time target back pressure, and in the process, the real-time target back pressure is calculated; key parameters of a wellhead back pressure real-time prediction model are determined by acquiring standing pressure parameters and bottom hole pressure parameters in a non-control instruction downloading process, namely, wellhead back pressure adjustment proportion parameters are determined, so that initialization of the wellhead back pressure real-time prediction model is completed, and real-time measurement standing pressure in a pressure control instruction downloading process is acquired, so that the wellhead back pressure real-time prediction model is obtained. The real-time target return pressure is calculated through the constructed wellhead return pressure real-time prediction model, and the wellhead pressure is adjusted in real time according to the real-time target return pressure, so that the bottom hole pressure negative fluctuation of the instruction transmitted while drilling is balanced, the downhole complex occurrence probability is reduced, and the drilling safety is further guaranteed.

The invention relates to the field of oil development engineering, in particular to a method, a system and equipment for controlling water content rise of an oil well of an ultra-low permeability reservoir. The problems that an existing method is short in validity period and causes pollution to stratums and the environment are solved. The method comprises the following steps: screening oil wells based on basic data to obtain a target oil well; pressure distribution of plane radial flow and pressure distribution of gas-phase unidirectional flow of the gas cap of the target oil well are calculated; pressure distribution of plane radial flow and pressure distribution of liquid-phase unidirectional flow of the oil layer of the target oil well are calculated; the position of the perforation is further calculated; calculating a roof-remaining reference value based on the stratigraphic dip angle, and calculating a roof-remaining thickness based on the roof-remaining reference value; setting the perforations based on the positions of the perforations and the thickness of the top, and adjusting the pressure distribution of the perforations by adjusting the bottom hole pressure based on practice so as to adjust the water content rising speed. The invention has the advantages of long period of validity and no pollution.

The invention relates to a stratum karst cave volume inversion system and method in a drilling gas cut process, and belongs to the technical field of petroleum drilling engineering, and the system comprises a shaft throttling circulation pressure control part, a throttling response parameter acquisition part and a multiphase flow simulation software part. By means of the system, three wellhead throttling response parameters including wellhead back pressure, inlet flow and outlet flow can be obtained, then bottom hole pressure, gas dissolution amount and gas cut flow are predicted based on a multiphase flow model, and stratum karst cave volume inversion is conducted through an oil reservoir model and a gas state equation. According to the method, on-site available parameters are fully utilized, a large amount of data training is not needed, and the method has the advantages of being simple, efficient and high in real-time performance; in addition, related parameters are obtained in the process of taking pressure control measures, and the method has a restraining effect on gas cut development. By means of the method, the volume of the stratum karst cave can be calculated after gas cut occurs in the shaft, and theoretical support is provided for stratum pressure control well drilling and well control measure decision making.

The invention relates to the technical field of oil and gas field drilling and logging, and particularly discloses a formation pressure monitoring method and system based on drilling and logging real-time data fusion. The formation pressure monitoring method comprises the following steps that S1, geological data of a drilling well adjacent to a target well in a geological block where the target well is located are obtained, and formation factors of the geological block are obtained; s2, comprehensive real-time well drilling data of the target well are obtained, and a dynamic factor of the target well is solved; s3, constructing a formation pressure evaluation model of the target well by using the formation factor and the dynamic factor and utilizing a formation pressure monitoring model, and taking the formation pressure evaluation model as a real-time monitoring standard of the target well; and S4, the dynamic factors and the bottom hole pressure of the target well are monitored in real time, and the formation pressure can be monitored in real time according to the formation pressure evaluation model of the target well. No underground sensor is needed, and the formation pressure can be monitored in real time only through well gas measurement data.

The present application relates to a kind of design methods of cementing annular slurry column, comprising the following steps: 1) collecting the leakage parameter of the weakest formation in the formation to be cemented, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter;2) calculate the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation;3) according to the leakage parameter of the weakest formation, the leakage parameter of the second weakest formation, the bottom hole leakage parameter and the maximum formation pressure parameter, the maximum pressure bearing parameter at the weakest formation when cementing operation is bumped, the maximum pressure bearing parameter at the second weakest formation when cementing operation is bumped, the maximum pressure parameter that bottom hole bears when cementing operation is bumped and the bottom hole pressure parameter when tail slurry gelatinization loses weight during cementing operation, it is judged whether annular slurry column is designed reasonably.

This invention provides a method for dynamic prediction of cement slurry weight loss in long inclined vertical well sections. The method includes: calculating the effective bottom hole pressure P during the cement slurry weight loss process. b Effective pressure at the bottom of the well, P b The calculation formula is: P b = P0 + P1; where P0 is the liquid column pressure at the top of the cement slurry; P1 is the effective pressure of the cement slurry; the calculation of the effective pressure P1 of the cement slurry includes determining the remaining pressure P after the cement slurry gels and loses weight, taking into account the eccentricity of the tailpipe and the downhole temperature and pressure. sy The residual pressure P after the cementation and weight loss of the mud obtained by this invention sy The calculations are more consistent with the gelation and weight loss characteristics of cement slurry under complex downhole conditions, effectively ensuring the accuracy of dynamic prediction of cement slurry weight loss.

The present invention relates to the technical field of pressure-controlled drilling for oil and gas development, and in particular to a pressure-controlled drilling method for a formation with coexisting leakage and spillage based on a controllable pressure window. The technical solution comprises the following steps: determining the formation pressure coefficient and pressure window; judging whether the pressure window is safe based on monitoring data and the density of the drilling fluid used on site; if the pressure window is within the safe pressure window, maintaining normal drilling; otherwise, entering the controllable safety window calculation process; determining the maximum controllable leakage rate based on the actual leakage volume and the on-site drilling fluid mud supply capacity; determining the maximum controllable overflow rate based on the on-site wellhead back pressure control capacity; forming a controllable safety density window; after obtaining the controllable drilling fluid safety density window and the bottomhole pressure range, updating the safety density window, and drilling under the condition of maintaining micro-leakage and micro-overflow in the coexisting leakage formation. The present invention implements a pressure-controlled drilling method within the controllable pressure window, thereby ensuring operational safety.

The invention discloses a method and device for determining an oil reservoir intermittent steam injection period, a medium and electronic equipment. The method comprises the steps that the well shut-in time and the bottom hole pressure of an oil well are obtained, and correlation of the well shut-in time and the bottom hole pressure is achieved; acquiring a shut-in pressure curve and a bottom hole pressure curve according to geological characteristics and development characteristics of the oil reservoir; and according to the well shut-in time, the well shut-in pressure curve and the bottom hole pressure curve, the intermittent steam injection period of the oil reservoir is calculated. According to the technical scheme, the huff-puff oil-gas ratio of the oil reservoir can be increased.

The invention discloses a construction parameter processing method and device and a nonvolatile storage medium. The method comprises the steps that multiple construction parameters corresponding to multiple moments during reservoir transformation construction are obtained, and the multiple construction parameters are used for conducting transformation construction on a reservoir; according to the multiple construction parameters, distribution of fluid in a target shaft at the target moment is determined, the multiple moments comprise the target moment, and the target shaft is used for conveying fluid used for transforming a reservoir to the reservoir; and determining the target bottom hole pressure at the target moment according to the distribution of the fluid in the target shaft. The technical problem that in the prior art, a data analysis method for reservoir transformation construction parameters is not deep is solved.