259 results about "Well test" patented technology

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 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.

Systems and methods for performing targeted stimulation of a well drilled in a subsurface formation include performing a dynamic well test in the well; logging the well to generate one or more diagnostic well logs prior to stimulating the subsurface formation; identifying one or more zones in the well for targeted stimulation based on the injection test and the one or more diagnostic well logs; and performing the targeted stimulation at the identified one or more zones.

The invention discloses a deep and shallow well dewatering construction method for a multi-aquifer communicated stratum foundation pit. In order to solve the problems of sedimentation outside a pit and wall deformation caused by one-time pumping and descending of a traditional mixed well, a shallow well with a filter screen located in a phreatic layer and a deep well extending to a confined aquifer are arranged in a foundation pit in the construction method; measuring and setting out, exploring and digging, hole forming, hole cleaning and slurry changing, well pipe descending, filling, water stopping and well washing are sequentially completed, and then an independent pumping and descending system is formed; water level, water quantity and peripheral deformation data are obtained through a single well-group well test, and a deep well starting threshold value is determined; before the foundation pit is excavated, only a shallow well is started to drain a phreatic bed, deep well pressure reduction is started in an echelon mode after the foundation pit is excavated to the preset depth and a support is erected, and on-demand dewatering is achieved; the bottom plate construction stage is divided into three stages for well shut-in. The construction method can obviously reduce the drop amplitude of the water level outside the pit, the lateral displacement of the wall body and the ground surface settlement, has the advantages of safety, economy and environmental protection, and is suitable for coastal complex geology deep foundation pit engineering.

The invention provides an improved analysis method for conventional pressure recovery well testing. The improved analysis method comprises the steps that 1, improved conventional pressure recovery well testing analysis is conducted; and step 2, analyzing and solving the improved conventional well test. According to the method, a conventional pressure recovery well testing analysis theory explanation method is improved, continuous changes of reservoir parameters are analyzed through a nonlinear segment analysis method, and more reliable parameters are provided for meeting actual production requirements.

The invention discloses a method and system for determining the type of a reservoir fracture network around a well by using pressure recovery well testing data, and the method comprises the steps: obtaining the fracture development condition of the reservoir around a fractured tight sandstone gas reservoir gas well, and determining the fracture development density of a production well section and a reservoir transformation and production improvement scheme; on the basis of the fracture development density of the production well section and the reservoir transformation and production improvement scheme, pressure recovery well testing of the fractured tight sandstone gas reservoir gas well is carried out, and reservoir physical property parameters are obtained; and according to reservoir physical property parameters, the type of the reservoir fracture network around the well is determined by combining the relationship between the single well fracture development condition and the slope of the upwarp linear characteristic section in the later stage of the pressure recovery well testing curve pressure derivative. According to the method, the fracture development conditions of the reservoir around the well corresponding to different pressure recovery well test derivative curve characteristics can be determined, and fracture network development difference research can be carried out; and a basis is provided for carrying out crack research on a single well for obtaining the crack development condition of the reservoir around the well without developing methods such as imaging logging and the like.

A method includes: accessing a full-field model for a reservoir containing wells without well-test events and wells with well-test events; importing records from all wells and well-test results from the test-available wells; creating a local grid refinement in a vicinity of each test-available well; launching a first iteration of simulation; using artificial intelligence to determine, for each test-available well, a first ratio of a simulated pressure derivative from results of the first iteration of simulation and an observed pressure derivative from the well-test results; launching a second iteration of full-field simulation using the model where the first ratio is used as a permeability multiplier in the vicinity of each test-available well; and responsive to meeting an objective of the simulation, generating a report delineating re-distributed permeability in the reservoir based on combining the records from all wells and the well-test results from the test-available wells corrected by respective permeability multipliers.

A stress sensitivity analysis method for a fractured gas reservoir includes: S1, calculating a material balance quasi-time; S2, calculating a normalized production; S3, calculating a single well controlled reserve; S4, analyzing and judging a stress sensitivity. Based on the normalized quasi-pressure and quasi-time, the gas well test analysis is carried out, and the stress sensitivity of the actual reservoir is determined by taking the original bottom hole flowing pressure of the actual reservoir as the starting point, the obtained reservoir stress sensitivity is more in line with the actual situation of the reservoir, and the obtained reservoir stress sensitivity is more accurate, which provides more valuable values for reservoir protection, oilfield development, and development planning.

The invention belongs to the technical field of well testing, particularly relates to a well testing interpretation method for an analytical model of a fractured well of a linear composite oil reservoir, and aims to solve the problems that in the prior art, unit division needs to be carried out on a reservoir, the process is tedious, the speed is low, and the precision is prone to being influenced by the number and size of grid units. The method comprises the steps that a linear composite oil reservoir fractured well analysis well testing model is established according to an unstable seepage theory; the linear composite reservoir fractured well analytical well testing model is transformed through a Laplace integral transformation method and a Fourier transformation method, after transformation, superposition integration is carried out in the fracture direction by combining the symmetry of fractures, and a bottom hole pressure solution is obtained; and drawing a well testing theoretical curve and an actually-measured double logarithmic curve, and fitting the actually-measured double logarithmic curve and the well testing theoretical curve to obtain reservoir parameters. According to the method, reservoir unit subdivision is not needed, the curve fitting speed and precision are improved, and the method can be used for reservoir parameter inversion, yield or pressure simulation and prediction and the like.

The invention relates to a ground simulation device for testing an underground logging pup joint, which comprises a logging pup joint and a leak-off ring which are arranged in a kettle body, the logging pup joint is positioned in the leak-off ring, the kettle body is connected with a slurry injection unit, and the slurry injection unit is used for injecting slurry into a space in the leak-off ring and a space outside the leak-off ring. The slurry injection unit is also used for injecting pressure into the leak-off ring, so that the slurry in the leak-off ring is filtered into a mud cake; electromagnets and force measuring sensors are arranged on the left side and the right side of the kettle body, the electromagnets are used for providing suction force for the well logging short section, and the force measuring sensors are used for measuring the suction force of the corresponding electromagnets; the lower end of the kettle body is connected with a vertical force applying unit, and the vertical force applying unit is used for injecting a jam releasing force in the vertical direction to the lower end of the kettle body so as to research the relationship between the jam releasing force and the suction force. Potential hazards possibly caused by testing of the well logging short section in an actual well are greatly avoided, and manpower, material resources and time cost are saved to a great extent.

The invention relates to a fractured water sandstone gas reservoir development production allocation method and system, and belongs to the field of oil and gas field dynamic analysis and research. The method comprises the steps that an optimized production allocation well is determined based on the production well testing comprehensive permeability, the storage capacity ratio and the breaking joint directional strength coefficient; establishing a matrix-fracture gas supply coupling chart for the determined optimized production allocation well; on the basis of the matrix-fracture gas supply coupling chart and the critical water invasion pressure difference, energy loss constraints are reduced, and the production allocation area with the optimized production allocation ratio of the production allocation well is obtained through diagrams. The water breakthrough gas well production allocation method is achieved through a critical water invasion pressure difference, gas well pressure drop rate and gas production index linkage dynamic constraint diagram method, the problems that reasonable productivity calibration and scientific and reasonable production allocation are difficult after gas well water breakthrough in a gas field are solved, the scientific production system of the water breakthrough gas well is effectively formulated, and the production efficiency of the gas well is improved. And a foundation is laid for reasonable and efficient development of gas wells and gas fields.

The invention discloses a shale oil well variable-pressure variable-yield well testing method and a well testing data analysis method. The well testing method comprises the steps that after a well is closed for a first set time, the pressure of each measuring point in a shaft is sequentially measured from top to bottom, and first static pressure gradient data is obtained; measuring oil production, water production, wellhead oil pressure, casing pressure and pressure at the first target measuring point according to a second set interval in the production process of the oil nozzle device with the set specification to obtain variable-pressure continuous test data; and sequentially changing the oil nozzle devices with different specifications according to a set rule, and metering oil production, water production, wellhead oil pressure and casing pressure according to a third set interval in a production process by utilizing each oil nozzle device, so as to obtain variable flow continuous test data. According to the method, data such as static pressure of a target measuring point and yields of different working systems are accurately obtained under the conditions that the permeability of a shale oil well is small, the oil yield is small and the stratum pressure recovery time is long through a variable-yield variable-pressure coupling well testing test.

The invention relates to a reservoir fracture permeability prediction method based on seismic wave attenuation attributes, and aims to predict fracture permeability in a fractured reservoir. The method comprises the steps of determining the lowest effective frequency and the dominant frequency through statistical calculation of a three-dimensional seismic data frequency spectrum, calculating fracture strength distribution through seismic wave attenuation attributes, interpreting permeability data through production well testing, fitting the permeability data with the fracture strength, and establishing a conversion relation between the fracture strength and the permeability. And finally, establishing fracture permeability spatial distribution through the conversion relation. According to the method, the defects that in the prior art, fracture fragments are determined through variance and an ant tracking method, then a discrete fracture network model is constructed through a simulation means, and the fracture permeability is indirectly calculated are overcome, the calculation uncertainty is greatly reduced without using a simulation method, the fracture prediction precision is remarkably improved, and the method is suitable for large-scale popularization and application. And a new technical means is provided for exploration and development of fractured permeable reservoirs.

A cyclonic system and method for gas-liquid-solid separation is provided. The system may comprise a Gas-Liquid Cylindrical Cyclone (GLCC) for gas-liquid separation, a cyclone for solid particle separation, and a cyclone for droplet separation. The GLCC may have a vertical churn flow coalescer and a horizontal inlet with an internal inclined flow diverting plate to direct the flow tangentially to the GLCC. The cyclone with a horizontal tangential inlet for solid separation may be installed at the lower section of the vertical churn flow coalescer. Solid particles may be collected at the bottom and discharged. The cyclone for droplet separation may be installed at the upper section of the GLCC. Liquid may be collected in the annulus and drained to the lower section of the GLCC.

The present invention relates to a wellbore string and reservoir integrated well test interpretation and analysis method, device, medium, and equipment. The method comprises: establishing a vertical wellbore string model that takes gravity into account based on the law of conservation of momentum, integrating the control equation of the vertical wellbore string to obtain the coupling equation of the vertical wellbore string and the reservoir; establishing a reservoir model that takes gravity into account based on the principles of seepage mechanics, and using the Laplace integral transformation method to obtain a pressure distribution solution for the reservoir model; substituting the pressure distribution solution of the reservoir model into the coupling equation of the vertical wellbore string and the reservoir and discretizing it, solving the discretized coupling equation to obtain the flow rate at discrete units in the vertical wellbore string and the pressure solution deep below the pressure gauge. The method can realize real-time interpretation and analysis of oilfields based on continuously monitored pressure and flow data from the wellbore, and realize dynamic simulation analysis and predictive analysis of oilfield production.

The invention provides a transient productivity prediction method based on a fracture-vug reservoir pressure recovery well test model, and relates to the technical field of oil and gas reservoir development. The prediction method comprises the following steps: S1, through fracture-vuggy reservoir pressure recovery well test interpretation, establishing a fracture-vuggy reservoir well test geologic model, and obtaining reservoir parameters; s2, establishing a bottom hole pressure calculation equation under a constant flow condition, and calculating bottom hole pressure by adopting a multi-stage flow superposition principle; s3, establishing a yield calculation equation under the condition of the fixed bottom hole pressure to obtain data of flow changing along with time under the fixed bottom hole flow pressure; s4, forming a productivity prediction method that both the yield and the bottom hole pressure change along with well testing, and establishing a productivity calculation equation of the yield and the pressure when both the pressure and the flow change based on a Duhanm principle to realize transient productivity calculation prediction; therefore, a new productivity prediction method suitable for the fracture-cavity type oil reservoir is formed. The long-term production pressure and yield change of the oil well can be predicted more accurately, and development and production allocation are guided.

The present application relates to the technical field of well testing analysis, and is a high-temperature and high-pressure deep well perforation early formation fluid property prediction method. The method is performed according to the following steps: establishing a fitting equation of the maximum value of the average density of the downhole mixture of the early production test of the high-temperature and high-pressure deep well of the tested oil in the research area and the static pressure gradient at the perforation section after the normal production test of the high-temperature and high-pressure deep well of the tested oil; establishing a corresponding relationship table of the static pressure gradient T at the perforation section of the high-temperature and high-pressure deep well and the formation fluid property; and obtaining the predicted formation fluid property of the to-be-evaluated oil well from the maximum value of the average density of the downhole mixture of the early production test of the to-be-evaluated oil well. The present application provides a high-temperature and high-pressure deep well perforation early formation fluid property prediction method, fills the blank of the high-temperature and high-pressure deep well perforation early fluid property prediction technology, and has the characteristics of simplicity, high efficiency, low cost, and high accuracy.

The present disclosure provides a method, device, electronic device and storage medium for determining well test information, and relates to the field of well test technology. The method includes: determining at least one group of test well groups for testing the reservoir based on the acquired planar heterogeneity parameters of the reservoir to be tested; for each test well in the test well group, acquiring well logging data of the area where the test well is located, and determining the longitudinal heterogeneity parameters of the test well based on the well logging data; determining the test method of the test well based on the longitudinal heterogeneity parameters of the test well; and determining the position of at least one group of test well groups and the test method of each test well as the well test information of the reservoir. Through the above scheme, the efficiency of oil and water well testing can be improved without affecting production as much as possible, and the deployment of planar and longitudinal logging methods and schemes for heterogeneous reservoirs can be realized, providing effective test data for reservoir parameter inversion, obtaining good pressure recovery well test data, and reducing the impact on oil field production.

The embodiment of the present application discloses an application method, device, terminal and storage medium of a binomial production capacity equation, which belongs to the field of gas reservoir engineering for natural gas extraction. The application method of the binomial production capacity equation provided in the present embodiment is that the terminal can process the historical well test data according to the linear regression analysis method to obtain a binomial production capacity method, and at the same time obtain the binomial relationship that conforms to the physical environment parameters of the target gas well. Combining the above binomial production capacity method and the binomial relationship, the production capacity parameters of the target gas well can be obtained, wherein the parameters finally obtained can indicate the natural gas generation capacity of the target gas well. Since the above process can avoid the use of complex professional engineering software to calculate the production capacity parameters, the embodiment of the present application has the function of reducing the calculation complexity of the production capacity parameters, and at the same time can ensure the closeness of the production capacity parameters to the actual data.

The application discloses a well testing pretreatment method and device, and belongs to the field of oilfield development. The method is applied to a computer device and comprises the following steps: controlling a liquid injection device to inject liquid into a first well, so that the liquid injected into the first well penetrates into a target reservoir through a well wall of the first well; monitoring the pressure at the well mouth of the first well during the injection of the liquid into the first well; when the pressure at the well mouth of the first well reaches a pressure threshold, controlling the liquid injection device to stop injecting liquid into the first well and monitoring the change rate of the pressure at the well mouth of the first well; when the change rate of the pressure at the well mouth of the first well is stable, controlling a liquid return channel and a first packer to be opened, so that the liquid penetrating into the target reservoir returns to the well mouth of the first well through the liquid return channel; and monitoring the pressure difference on both sides of the first packer during the liquid return, and when the pressure difference on both sides of the first packer reaches a pressure difference threshold, controlling the liquid return channel to be closed. The application can improve the well testing effect.

The invention provides a well spacing method for a multi-thin-layer tight sandstone gas reservoir under complex landform conditions. The well spacing method comprises the following steps: finely describing a sand body structure, determining the development scale and characteristics of a single sand body, and constructing a width-to-thickness ratio empirical formula of the single sand body; according to a sedimentary microfacies research result of a to-be-distributed well area and a single sand body width-to-thickness ratio empirical formula, drawing a plane distribution diagram of each layer of sand body, according to a reservoir parameter standard of the to-be-distributed well area, compiling and developing a favorable area in a layered manner, and overlapping to form a construction and production favorable area plane graph; collecting interference well testing data of a to-be-distributed well area or an adjacent area, counting well row spacing when interference is seen so as to determine reasonable well spacing of the to-be-distributed well, and carrying out numerical simulation to optimize the well pattern model; according to the method, topographic and geomorphic characteristics are considered as a whole, and in a construction and production superposition favorable area, a regular hexagon seven-point well pattern is adopted for well spacing, so that the well pattern is matched with a topographic and geomorphic target body. The problem that in the prior art, a multi-thin-layer sandstone gas reservoir is not prone to forming a well site under the complex landform condition is solved.

This invention discloses a method, apparatus, equipment, and storage medium for determining the reservoir control limit of strike-slip faults. The method includes: determining oil and gas reservoir evaluation indicators for each well within a target area based on single-well test data; determining matching oil and gas reservoir evaluation indicators for each depth interval based on the oil and gas reservoir evaluation indicators for each well within the target area; wherein the depth intervals are determined based on statistical results of the drilling depths of each well within the target area; determining the correlation between the matching oil and gas reservoir evaluation indicators for each depth interval and the pre-obtained oil and gas supply depths of each well; and determining the reservoir control limit of strike-slip faults within the target area based on the correlation. This technical solution solves the problem of low reliability in determining the reservoir control limit of strike-slip faults, and can improve the accuracy of predicting the reservoir control limit of strike-slip faults while providing corresponding technical support for the selection of potential zones.

The invention discloses a productivity prediction method and device based on multi-layer commingling exploitation development, equipment and a medium. The method comprises the following steps: performing well test interpretation on a multi-layer oil reservoir corresponding to a reference oil well based on test data of a short-time pressure drop test to obtain an inversion parameter corresponding to each layer section; determining an initial injection index of each layer section according to the test data of each layer section; correcting the initial injection index based on the test data and the inversion parameter of each layer section to obtain a target injection index of each layer section; and determining a productivity prediction model according to the target injection index of each layer section and the multi-layer commingling production oil production index of the reference oil well, and performing productivity prediction on the target oil well based on the productivity prediction model. According to the technical scheme, external interference caused by a short-time pressure drop test can be effectively eliminated by correcting the injection index, the accuracy of the injection index is improved, the fitting effect of the injection index and the oil production index is enhanced, and the accuracy of multi-layer commingling production capacity prediction is improved.

The application discloses a kind of faulted dissolution body reservoir oil well producing depth acquisition method, device, equipment and medium.Faulted dissolution body reservoir oil well producing depth acquisition method includes: obtaining the temperature well testing monitoring data of target faulted dissolution body reservoir oil well;Temperature well testing monitoring data is handled, and actual temperature well testing interpretation curve is obtained;Temperature well testing model of target faulted dissolution body reservoir oil well is constructed, and the theoretical temperature well testing interpretation curve corresponding to multiple heat transfer distances is obtained based on temperature well testing model;Comparative analysis actual temperature well testing interpretation curve and theoretical temperature well testing interpretation curve, the heat transfer distance corresponding to the theoretical temperature well testing interpretation curve most matched with actual temperature well testing interpretation curve is determined as the producing depth of target faulted dissolution body reservoir oil well.Using the present application can reduce the uncertainty of faulted dissolution body reservoir producing depth calculation, improve the accuracy of producing depth calculation.

The invention discloses a seepage capacity analysis method and device for a deep carbonate rock gas reservoir. The method comprises the steps that static data and dynamic data of the carbonate rock gas reservoir are obtained; extracting distribution characteristics and development characteristics of a reservoir medium from core pore structure analysis data, and constructing a plurality of core conceptual models; determining longitudinal and transverse distribution characteristics and development characteristics of a reservoir medium of the carbonate gas reservoir according to the seismic interpretation data and the logging data, and constructing reservoir conceptual models of different types in combination with a plurality of core conceptual models; within the maximum well control range of a single well, according to the reservoir conceptual models of different types and the multiple core conceptual models, a digital core single well conceptual model is constructed; finite element flow simulation test operation is conducted on the digital core single well conceptual model, a simulation well test curve is drawn and compared with a real well test curve, an optimized digital core single well conceptual model is obtained, and the difference between the macroscopic seepage capacity interpretation result such as oil test and well test and the actual productivity of a gas well is reduced.

The invention discloses a coupling method of a shale gas multi-scale percolation mechanism. The coupling method comprises the following steps: establishing a percolation equation based on a quadruple-pore shale matrix model of spherical matrix particles and columnar matrix bars; establishing a seepage equation considering a gas slippage effect, a diffusion effect and adsorption gas desorption; establishing a seepage equation considering the starting pressure gradient and the crack stress sensitive effect; establishing a seepage equation considering desorption of adsorbed gas on the surfaces of the organic matter particles and diffusion of dissolved gas in the organic matter particles; carrying out simultaneous solution on a total seepage equation obtained by coupling the boundary conditions and the pore model characteristics to obtain a bottom hole pressure solution of the fractured horizontal well; drawing a well testing curve chart according to the well bottom pressure solution of the fractured horizontal well; and fitting measured data by adjusting model parameters to obtain inversion results of reservoir parameters and fracture geometric parameters. According to the method, the seepage rule of the shale gas reservoir fractured horizontal well is more comprehensively simulated, and the interpretation precision and range of well testing parameters are improved.

The invention discloses a fracture-vug type gas reservoir well testing model with a shaft connected with a large karst cave and an establishing method and application of the fracture-vug type gas reservoir well testing model. The method comprises the following steps: selecting proper gas reservoir parameters to establish a fracture-vug type gas reservoir well testing model for connecting a shaft with a large karst cave according to a physical model for connecting the shaft with the large karst cave; according to the gas reservoir characteristics, an energy equation between the shaft and the large karst cave is established, the energy equation considers pressure loss at the joint of the large karst cave and the shaft, and the actual geological condition is better met. The novel fracture-vuggy gas reservoir well test interpretation method using the fracture-vuggy gas reservoir well test model comprises the following steps: performing solution and numerical inversion according to the fracture-vuggy gas reservoir well test model to obtain a real space bottom hole pressure solution; a real space bottom hole pressure value is obtained by utilizing the real space bottom hole pressure solution and combining the gas reservoir parameter actual value; and fitting the real space bottom hole pressure value with the actually measured bottom hole pressure data to obtain parameters such as the volume of the large karst cave. The karst cave volume of the gas reservoir can be explained more accurately by using the gas reservoir type well testing model.

The invention discloses a water invasion oil and gas well productivity prediction method and system based on well test interpretation and seepage theoretical calculation, and relates to the technical field of oil and gas reservoir development. The method comprises the following steps: establishing a gas well test interpretation model based on well test data; performing historical data fitting on the gas well test interpretation model to obtain a productivity well test indication curve; analyzing the characteristics of a productivity well testing indication curve, and introducing additional pressure loss coefficient and laminar flow item coefficient correction based on a seepage mechanics theory to obtain a plane radial non-Darcy seepage productivity evaluation model of the water-invaded gas well; and building a block well type and stratified system correlation coefficient correction chart based on a non-Darcy seepage productivity evaluation model, and guiding reasonable production allocation and injection allocation of the oil and gas field / gas storage well. Rapid and reasonable production allocation and injection allocation of the water-invaded gas well can be achieved, the cost is reduced, the efficiency is improved, the number of well testing times is greatly reduced, and reasonable and efficient operation of oil-gas field development / gas storage injection and production is guaranteed.

The present invention discloses a method for deep unblocking of a fixed pipe column of an oil well with complex blockage in an offshore oil field. The present invention adopts a new unblocking process of "bubble-unblock-wash-test-pressure-wash", and the specific method is: treatment of organic scale in the wellbore and near the well: conduct injection process, pump-inject organic unblocking agent, and soak for 12 to 48 hours; treatment of inorganic scale in the wellbore and near the well: pump-inject inorganic unblocking agent, shut down the well for 6 to 24 hours after unblocking; well washing operation; stepped pressure test injection, shut-in test; treatment of composite blockage in medium and long-distance wells: staged high pressure and large liquid volume injection; well washing operation. The method of the present invention is suitable for unblocking complex blockages in oil wells with heavy crude oil or polymer organic scale and inorganic scale and large blockage radius in offshore oil fields, and has the advantages of reducing operating costs and simplifying processes; conducting test operations, with flexible selectivity to ensure the effectiveness of measures; high pressure does not break the reservoir, preventing sand from coming out of the formation or rapid decrease in liquid volume after operation; large liquid volume injection, unblocking and instantaneous replenishment of formation energy.

The invention discloses offshore exploratory well testing and draining equipment and a metering method, and the offshore exploratory well testing and draining equipment comprises a liquid supply device, an underground device and a separation metering device, and further comprises a temperature difference energy thermal circulation device. The temperature difference energy heat cycle device comprises a steam generation assembly, a power generation assembly and a heating assembly; the steam generation assembly is used for generating steam by utilizing temperature difference energy of surface seawater and deep seawater; the power generation assembly is used for generating power through steam and supplying power to the heating assembly. The heating assembly is used for heating working fluid supplied into the downhole device. The working liquid heated to the preset temperature is supplied into the underground device and mixed with the produced liquid, the temperature of the mixed liquid of the produced liquid and the working liquid is increased, the viscosity of the mixed liquid is reduced, the mixed liquid is smoothly discharged to the separation metering device through the liquid outlet, and the problems that the temperature difference of an offshore exploratory well is large, the produced liquid is attached to the inner wall of a shaft due to low temperature, and productivity evaluation is affected are solved.