20 results about "Production string" patented technology

The application discloses a kind of well down pipe string erosion risk assessment method based on gas field production parameters, comprising the following steps, step 1, based on the relationship between the deformation wear amount, cutting wear amount and particle impact load of parent material, the production situation is established;Step 2, based on the production pipe string structure, the gas-solid erosion prediction model of production pipe string is established, and the grid-independent solution is obtained;Step 3, according to the relationship between the deformation wear amount, cutting wear amount and particle impact load in step 1, the gas-solid erosion prediction model is optimized to the error within 5% range;Step 4, based on the direct relationship between the optimized gas-solid erosion prediction model and production parameters, determine the production parameters corresponding to the erosion degree;Step 5, establish three-dimensional critical production parameter chart containing yield, pressure, sand production, according to the production parameters in step 4, erosion risk assessment is carried out on production pipe string of different materials.

The present invention seeks to solve the problem of hydraulic discontinuity by combining two approaches. It promotes the reduction of fluid density, via dilution of the inhibitor product with a water-based fluid, as well as increasing the fluid flow rate. The first approach reduces the hydrostatic gradient in the injection line, and the second approach increases the pressure drop due to friction in the line. Combined phenomena that prevent hydraulic discontinuity of the injection.To this end, the present invention adds to the surface equipment an assembly of an industrial water tank, pump and a line junction (flow T). This assembly will be responsible for diluting the inhibitor in the injection line, ensuring the minimum inhibitory concentration.

The present application relates to the technical field of oil and gas exploitation, and particularly relates to a kind of ultra-deep production string leakage detection system and method.The technical scheme is: through production string pressure detection unit and annulus pressure detection unit, real-time pressure data is obtained, and through first electric throttle control valve and second electric throttle control valve, the pressure of string side and annulus side is adjusted, so that wellbore forms controllable differential pressure condition under the premise of meeting safety conditions;The downhole detection sub is connected by armored cable and lowered into the production string, moves in the direction of well depth for continuous detection or fixed-point detection, and the multi-band signals detected are gathered through data transmission sub and then uploaded to the ground control and analysis system to complete the processing of detection data analysis and leakage result output.The present application improves the accuracy, stability and engineering applicability of leakage type, leakage location and leakage intensity discrimination, and provides technical support for ultra-deep gas well production string leakage diagnosis, workover decision and wellbore integrity management.

This application provides a shot-and-penetrate production string, comprising a tubing string, a first screen pipe, a self-sealing device, a differential pressure normally open valve, a second screen pipe, and a perforating gun connected in sequence. The self-sealing device has a cup fitted on its outer wall, with the outer diameter of the cup closer to the first screen pipe being larger than the outer diameter of the cup further away. The cup is adapted to fit against the inner wall of the wellbore and divide the annulus into an upper and lower zone. The cup allows fluid to enter the upper zone from the lower zone and prevents fluid from entering the lower zone from the upper zone. The differential pressure normally open valve closes when fluid is introduced from the tubing string, thereby preventing fluid from entering the lower zone within the shot-and-penetrate production string. Through this configuration, the internal and external actions of the cup and the differential pressure normally open valve jointly protect the oil layer from contamination by well-washing fluids and other liquids within the shot-and-penetrate production string.

The application belongs to the field of petroleum equipment, and discloses an injection-production string elastic creep simulation test device and method, which are used for simulating the elastic creep of the injection-production string. The device comprises a sleeve and a telescopic mechanism. The sleeve comprises a main body and a scale, and the main body defines a sealed cavity. In use, the telescopic mechanism is connected with a packer, the packer can be set in the sealed cavity, the packer generates displacement in response to the pressure change in the sealed cavity and drives the telescopic mechanism to generate elastic creep, and the distance of the elastic creep can be indicated by the scale. The injection-production string elastic creep simulation test device provided by the application can simulate the elastic creep of the injection-production string, provides technical support for evaluating the performance of the packer under the influence of the elastic creep of the injection-production string, and two elastic components are arranged in the simulation test device, so that the stretching and compression states of the string can be comprehensively simulated without interference.

The application is applied to a gas injection pipe column of a CCUS injection well and a construction method thereof. A packer is arranged in the pipe column. The well-remaining gas injection pipe column is mainly connected from bottom to top by a gas injection valve and the packer through a tubing. A lower end is connected with a running-in pipe column of a running-in tool. The well-remaining gas injection pipe column is lowered to a preset position in the well and is suspended in the well through the packer. After that, the running-in pipe column is pulled out. A lower end of the gas injection production pipe column is connected with a back-insertion pipe column which is lowered to a connection ring in the packer. The well-remaining gas injection pipe column is sealed and locked, and the gas injection task of the CCUS injection well is completed. The problems that the gas injection pipe column in the gas-water alternating injection well can test the gas absorption profile, and the corrosion of the casing section between the packer and the oil layer is not intensified, and the service life of the injection well is affected are solved. The construction in the wellbore above the packer is facilitated. The service life of the CCUS injection well is effectively improved. The construction time in the wellbore is shortened. The construction operation cost is reduced. The production cost is significantly reduced.

This invention attempts to address the problem of hydraulic discontinuity by combining two methods. The reduction of fluid density is promoted by diluting the inhibitor product with a water-based fluid and increasing the fluid flow rate. The first method reduces the hydrostatic pressure gradient in the injection line, while the second method increases the pressure drop due to friction in the line. This combined effect prevents hydraulic discontinuity in the injection. To this end, the invention incorporates an industrial water tank, pump, and line fitting (flow rate T) on ground equipment. This assembly is used to dilute the inhibitor in the injection line while ensuring a minimum inhibitory concentration.

The application discloses a complex well condition production pipe column transverse vibration suppression method, and belongs to the technical field of oil production. The method comprises a three-high gas well pipe column nonlinear flow-induced vibration model and a contact type transverse damping short section. Firstly, the three-high gas well pipe column nonlinear flow-induced vibration model is used to simulate and predict the vibration characteristics and vibration risk points of the pipe column. Then, according to the vibration characteristics predicted by the model, appropriate damping spring units are configured for the contact type transverse damping short section. Finally, the tool is lowered, so as to slow down the longitudinal vibration of the pipe column. When the transverse vibration of the three-high gas well pipe column is suppressed, the additional load on the pipe column is reduced, thereby reducing the risk of pipe column fatigue failure and ensuring the efficient and stable production operation of the oil and gas well.

The invention discloses a gas field immovable tubular column continuous well sealing method which comprises the following steps: putting a fishable sealing bridge plug at the upper part of a tool string in a multi-sealing tubular column oil pipe, and performing pressure test at a wellhead after the bridge plug is set; after the pressure test is qualified, the fishable bridge plug in the well is fished out, and the shaft is circularly cleaned; putting a permanent bridge plug at the upper part of the tool string in the oil pipe and setting, opening a gas well casing gate, and injecting cement into a gas well oil jacket annulus from the casing gate after emptying to block a gas well stratum and the annulus; cement is injected into the in-well oil pipe from the gas well oil pipe gate to block the oil pipe; according to the method, the problem that in the well plugging process of a multi-sealing production pipe column, pulling-out is difficult is solved, construction is easy, the construction period is short, and the simple, safe, effective and reliable plugging effect of an old well with a complex production pipe column of the gas well can be achieved.

The present application relates to heavy oil development technical field, especially a kind of coiled tubing injection natural gas realizes the device and use method of heavy oil cold production.Its technical scheme is: the upper end of coiled tubing is connected to natural gas storage tank by gas booster pump, the other end is lowered into to production string and is connected to pneumatic oil pump;One side of ground wellhead is connected to gas-liquid separator, the lower side of gas-liquid separator is exported to oil pipeline, and the upper part is connected to the upper side of natural gas storage tank;Natural gas is injected into downhole along coiled tubing after being pressurized, and then oil is mined to the ground gas-liquid separator by pneumatic oil pump, and natural gas is recycled after separation, and separated oil enters oil pipeline.The beneficial effect is: the present application utilizes the characteristics of natural gas to reduce the viscosity of heavy oil to realize the cold production of heavy oil, and on the other hand, natural gas can help to lift the liquid upward, thereby improving the efficiency of oil production and reducing the cost of heavy oil cold production.

The invention relates to the technical field of oil gas well oil extraction processes, and discloses a two-way sealing gas lift tool, a gas lift production pipe column, a system and a process. The two rubber sleeves are respectively sleeved on the peripheral wall of the gas lift tool body along the axial direction; the gas lift assembly sequentially comprises a gas inlet through hole, a gas lift valve and a gas outlet through hole in the gas flowing direction, the gas inlet through hole is formed between the two rubber barrels, and the gas outlet through hole communicates with the inner flowing channel; and the execution assembly is configured to enable the rubber barrel to be in a setting state or an unsetting state. By means of the technical scheme, the gas lift tool can be directly tripped and installed in an oil pipe, and gas lift production without moving a pipe column is achieved; a small oil pipe does not need to be put down, and borehole loss is almost avoided; in addition, the gas lifting tool does not need a packer, a sealing short section and the like, and is simple in structure and easy to implement.

The application discloses a well completion method for repairing a well primary barrier through a pin connection, and belongs to the technical field of oil well completion. The method first judges the integrity of a well secondary barrier. If the integrity of the well secondary barrier is unqualified, a well completion pipe string is replaced. If the integrity of the well secondary barrier is qualified, the sealing property of a packer seal is judged. If the sealing property of the packer is qualified, the original well pipe is pulled out, the integrity of a field end box end in a well bore is judged according to the pin end state of the original well pipe. If the integrity of the field end box end in the well bore is qualified, a new well completion pipe is lowered into the well bore and is connected with the original well pipe in the well bore through a pin connection for well completion. The application avoids the relatively high well control risk in the complicated treatment process in the operation process of completely replacing the production pipe string for the well completion of the low-pressure and low-efficiency well, causes the risk of the downhole secondary complexity, provides a new idea for the well completion process innovation of the low-pressure and low-efficiency well, and has great field application value and reference significance.

The application discloses a pipe string structure and a control method for self-flow gas injection from a high-pressure layer to a low-pressure layer, and improves technical problems such as high well completion operation cost and great process difficulty. The pipe string structure comprises a wellbore casing, an isolation assembly, a filter assembly and a gas injection assembly. The gas injection assembly comprises: a gas injection production pipe string arranged in the wellbore casing; a production packer arranged on the gas injection production pipe string and fixedly seated with the wellbore casing, and the production packer is located above a low-pressure layer of a formation; a distribution and injection valve arranged on the gas injection production pipe string and located below the production packer, and the distribution and injection valve is located at the low-pressure layer of the formation; and a sealing part connected to the bottom of the gas injection production pipe string and sealingly connected with the isolation assembly. The application can realize self-flow of natural energy of a high-pressure layer gas group to a low-pressure layer gas group in the same well, improve the recovery rate of the low-pressure layer gas group, save cost and reduce the well completion process difficulty, and the oil well can be subjected to separate layer exploitation in the later period.

The application provides a production pipe string safety evaluation method, device, equipment and medium, and the method comprises the following steps: dividing a production pipe string located in a stratum into a plurality of units, establishing a three-dimensional production pipe string stratum physical model, and establishing a three-dimensional production pipe string stratum temperature mathematical model based on the three-dimensional production pipe string stratum physical model; establishing a wellbore trajectory geometric description model based on measured wellbore trajectory data, and establishing an axial load mathematical model considering the self-weight of the production pipe string and the pressure of internal and external fluids through the wellbore trajectory geometric description model; establishing a reservoir reconstruction load change mathematical model based on a temperature effect theory; correcting a production pipe string strength safety coefficient according to the three-dimensional production pipe string stratum temperature mathematical model, the axial load mathematical model and the reservoir reconstruction load change mathematical model, and performing production pipe string safety evaluation according to the production pipe string strength safety coefficient. The temperature change and the temperature additional load borne by the production pipe string can be more accurately calculated.

The application discloses a high-temperature high-pressure large displacement well production pipe column safety evaluation system and an evaluation method. The high-temperature high-pressure large displacement well production pipe column safety evaluation system comprises a fluid circulation pipeline, a cooling tank, a mud pool, a heating tank, a pressurizing device, a wellbore experiment module, a load loading module, a strain measuring device, a temperature and pressure collecting module, a flow pump module, a one-way valve module and a control and data collection module. The control and data collection module is electrically connected with the cooling tank, the heating tank, the mud pool, the pressurizing device, the wellbore experiment module, the load loading module, the strain measuring device, the temperature and pressure collecting module, the flow pump module and the one-way valve module, and can collect temperature, pressure and pipe column strain data in a real-time manner during an experiment process. The load loading module is used for controlling the experiment process of the pipe column, and the flow pump module and the one-way valve module are used for starting or stopping and opening or closing to realize fluid circulation. The application can accurately evaluate the safety state of the large displacement well production pipe column.

This invention discloses a method for estimating the total flow rate of a shut-off valve based on fluid cutting. Its main working mechanism combines the cutting action of fluid on metals or non-metals with the control function of an energy storage shut-off valve, achieving the function of quantitative automatic closure of the shut-off valve. This designed shut-off valve can be applied to applications requiring quantitative fluid control. When installed on completion tubing or screens in oilfield production, it can automatically achieve the development effect of limiting the total flow rate per unit length of production tubing.

The application discloses a kind of offshore oil and gas well plugging production string and construction method, it is related to oil, natural gas production development technical field.The application includes single-core cable, cable marlon head, magnetic positioner, multistage plugging combustion mechanism and tail plug, multistage plugging combustion mechanism is composed of multistage ignition device and plugging explosive device connected alternately;Ignition device is built-in oil and gas well electronic detonator, plugging explosive device contains screen pipe, plugging explosive assembly, and plugging explosive is paste explosive formed by mixing and pouring oxidant, combustible agent and binder.Construction when string is lowered into well, the most bottom ignition device is initiated by ground communication control, and corresponding reservoir combustion and fracture are realized, then the upper explosive device is moved to the next target reservoir by dragging string, and the repeated initiation and fracture are realized.The application improves the reservoir reconstruction effect by multistage staged fracturing, greatly shortens rig occupation time, and the oil and gas well recovery after fracturing is significantly improved, and is suitable for offshore low-permeability oil and gas reservoir large-scale stimulation operation.

The application is a downhole packer, which comprises a setting mechanism and a releasing mechanism, and the locking mechanism is provided with an upper central pipe and a back-inserted pipe string connecting ring; the inner circle of the upper joint is sequentially connected with the upper central pipe and the lower central pipe and the releasing cylinder which can be inserted into the production pipe string from top to bottom; the outer surface of the upper central pipe and the lower central pipe is sequentially connected with the locking mechanism, the setting mechanism provided with a sealing assembly and the releasing mechanism through the upper connecting cylinder, the lower connecting cylinder, the lower top cylinder, the connecting head transmission torque cylinder and the lower joint from top to bottom; the transmission torque cylinder in the releasing mechanism is installed between the lower central pipe and the releasing cylinder and is provided with a ratchet pawl; the releasing cylinder is connected with the lower central pipe through a shear pin; the upper joint can be connected with the running-in pipe string through the shear pin; and the back-inserted pipe string connecting ring can be connected with the inserted pipe connected with the lower end of the production pipe string. The upper wellbore operation is facilitated without releasing and pulling out the packer, and the maintenance period and cost and the service life of the application well operation are significantly reduced and prolonged.