The method of hydrodynamic investigations of horizontal wells
The invention relates to the oil industry and can be used for hydrodynamic studies of horizontal wells. The technical result of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their reliability. In the horizontal part of the well on the tubing pipe place the container inside of which is placed deep stand alone devices. Placement on the column tubing Autonomous underlying instruments produce respectively geophysical characteristics plots deposits. Containers represent the sections of the pipe are cut slit. In string of tubing in the vertical part of the borehole place the pump below which is placed a filter made of perforated pipe section of the column tubing. Through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio. Excitement wells produce an installed pump. The interpretation of the data is carried out according computational algorithm. 1 Il.
The known method of hydrodynamic investigations of horizontal wells, including the placement of instrumentation at the end of the column flexible pipes, inside of which is omitted geophysical cable, pushing the flexible pipe in a horizontal wellbore, pumping cavity to the flexible pipes or fluid and gas research (Osadchy C. M., Telescop C. M. the State and prospects of development of technologies for investigation of horizontal wells during testing and operation/Scientific and technical Bulletin of “Carotenic”. 2001, S. 107-19).
The disadvantage of this method is the complexity of the excitation wells in the research process.
Closest to the invention to the technical essence is a way of hydrodynamic investigations of horizontal wells, including the determination of the parameters of the curve pressure restoration and interpretation of the results of hydrodynamic research-based methods of regulation (Muslimov R. H. and others interpretation of the results of hydrodynamic investigations of horizontal wells/Oil industry. No. 10, 2002, S. 76, 77 prototype).
The known method does not allow to artificially stir well and bring it to the steady-state mode, which reduces DOS is>p>The objective of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their confidence.
The task is solved in that in the method of hydrodynamic investigations of horizontal wells, including the stimulation of the well, measured parameters with the help of underlying instruments, available in horizontal sections with different geophysical characteristics, and processing of measurement results according to the invention, before carrying out research on the column tubing place the containers that represent the sections of the pipe are cut slit, inside containers set deep stand alone devices, omit the column tubing into the hole in the vertical part of the well in the tubing pipe install pump rod, below which is placed a filter made of perforated pipe section of the column tubing, through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio, in this case the excitation of the borehole produced by the same pump.
Currently, it is lnyh wells. When processing data, which are obtained during the well test, a so-called inverse problem of filtering. It can be formulated as the problem of determining the geometric and dynamic characteristics of the layer at a known pressure changes and the rate of filtration of fluid at certain points of the layer.
On the basis of the regularization methods developed computational algorithm for the interpretation of the recovery curves (fall) pressure in the horizontal well taken concurrently by multiple gauges installed on different parts of the horizontal part of the trunk. It allows us to estimate the heterogeneity of the flow parameters along the length of the horizontal portion of the horizontal well.
To solve this problem we use the following approach: minimize the standard deviation of the calculated bottomhole pressures from observable
wherei(t) is observed; pi(t) is calculated pressure in the locations of the devices at time t;
N is the number of installed devices;
k - coefficient of permeability;
- elm who is in the class of piecewise constant functions. Minimization of the standard deviation of J is based on optimal control methods. The distribution of the pressure field in a formation penetrated by a horizontal well, is the finite difference method.
However, existing tools and methods are complicated and not reliable enough. The objective of the invention is to simplify the hydrodynamic studies of horizontal wells and increase their confidence.
The problem is solved by the following set of actions.
Before conducting research in string of tubing place the containers that represent the sections of the pipe are cut slit. Inside containers set deep stand alone devices. Omit the column tubing in the well. In the vertical part of the well in the tubing pipe install pump rod, below which is placed a filter made of perforated pipe section of the column tubing. Through cracks in the container and the perforated filter shall receive the downhole fluid to the pump intake from the column tubing and the annulus. Spend the excitation of the well sucker-rod pump, metering couples who perform, and processing of measurement results.
Through cracks in the container and the perforated filter inner space of the column tubing and annulus are reported in the locations of underlying instruments. The flow of the well fluid to the pump intake occurs through the column tubing and the annular space.
Excitement wells produce an installed pump.
The invention is illustrated in Fig.
In Fig. presents the horizontal portion of the well 1, which lowered the column tubing 2 to a pump 3, a filter 4 and the container 5 is placed in them deep Autonomous devices 6. Placement on the string of tubing 2 containers 5 and, accordingly, the depth of the Autonomous devices produced in accordance with the assumptions of permeability zones of the reservoir, made in accordance with the preliminary geophysical exploration wells. The filter is a perforated section of pipe with a length of 1.5 m as the depth of Autonomous devices use a standalone gauges-thermometers, such as AMT 06. As the pump using pump rod, for example GW-43. The container represents the study of horizontal oil wells No. 1947 Sirenesque field.
The well has a vertical long section 1102 m and a horizontal segment with a length of 310 m Horizontal section of the well is made without the casing. In the well is lowered column tubing with a diameter of 73 mm In the vertical part of the well in the tubing pipes placed pump rod brand NGV-43, column connected rods with machine-rocking at the wellhead. Lower sucker rod pumps posted by filter, which is perforated section of pipe from the column tubing with a length of 1.5 m On the horizontal section of the column tubing in three places set containers, representing part of the pipe from the column tubing on which the cut slit. Inside the containers are placed offline depth instrument gauges-thermometers type AMT-06. Containers and instruments are located in areas well with different permeability of the reservoir, the first at a distance of 40 m, the second - 230 m and the third is 300 m from the beginning of the horizontal section of the well. The collector of the productive formation is porous and fractured. The average saturation - 0,66. Oil viscosity at reservoir conditions - 30,6 MPa·C.
Initiate a subsurface pump and who is ut. Deep devices are constantly measuring pressure and temperature. Stop the hole and raise the column tubing to the surface. Take readings of the downhole devices. Process the measurement results of the data underlying computing devices according to the algorithm in recovery mode pressure after stopping well. Build recovery curve pressure measurement results data downhole tools. Based on the input data to calculate the series recovery curves of pressure and the method of successive approximation receive the calculated curve with the values of pressure differing from the pressure values on the curve from the measured data, not more than 10-6. This calculated curve determine the estimated permeability and divide it into the oil viscosity, receiving the mobility of the formation fluid at this point well. The result determines that the area of the first device, the mobility of the formation fluid is equal 0,00274 μm2/MPa·with, in the area of the second device - 0,00255 μm2/MPa·and in the area of the third unit - 0,00071 μm2/MPa·C. based On these data conclude that in zones 1 and 2 of the device, where mobility is high, there in the water corroborate data thermometry. Take into account the temperature of the formation fluid at the beginning of the entry mode and at the end of the exit to the mode of operation of the well after the pump start. Determine the temperature difference at the end and at the beginning of the entry mode. Establish that in the area of the first device, the temperature difference is equal to 0.2°C, in the area of the second device is equal to 0,33°C and in the area of the third unit to 0.03°C. these temperature measurements confirm the conclusion reservoir permeability in these zones.
The application of the proposed method will simplify hydrodynamic studies of horizontal wells and to increase their reliability.
The method of hydrodynamic investigations of horizontal wells, including the stimulation of the well, measured parameters with the help of underlying instruments, disposable on a horizontal section of the well with different geophysical characteristics, and processing of measurement results, wherein before carrying out research on the column tubing place the containers that represent the sections of the pipe are cut slit, inside containers set deep stand alone devices, omit the column tubing in SC is the same place which the filter is made of perforated pipe section of the column tubing, through cracks in the container and through the filter shall receive the downhole fluid to the pump intake through the column tubing and microbio, in this case the excitation of the borehole produced by the same pump.
FIELD: mining industry.
SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.
EFFECT: optimized well operation.
FIELD: oil and gas extractive industry.
SUBSTANCE: device has body placed in body of stream pump and has locking valve and axial channel for logging cable with fixed logging device. Device also has discharge valve. Device body has ports in middle portion, which connect middle hollow portion of device to displacement chamber for stream pump. In upper and lower portions of body of device upper and lower compactors are placed, limited by support elements on each side of the latter, respectively. Locking valve is mounted in lower portion of device and mated with inner space of tubing string and logging device. Axial channels of valves are eccentric and parallel to first channel of device, while discharge valve is provided with rod with its end prominent relatively to body of device.
EFFECT: broader functional capabilities, higher reliability.
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes selection of cable of required rigidity and fixing devices on it. Transporting of devices into well is performed under effect from weight of cable and devices. Cable also contains inner hermetic pipe, which is plugged on both sides prior to lowering cable into well. Liquid is pumped into pipe under pressure through locking valve in upper plug and is kept in pipe under constant pressure during operation. After that cable is lowered with devices fixed to it. Value of pressure of liquid in pipe is determined from formula Ppipe≥ Pwell(Scable/Spipe-1)-QcablexLcable/Spipe<Ptear, where Ppipe - pressure of fluid in pipe, kg-wt/sm2; Scable - cross-section of cable with pipe, sm2; Pwell - hydrostatic pressure of well liquid column at depth of planned delivery of devices on cable, kg-wt/sm2; Spipe - cross-section area of pipe aperture and plug area equal to it in contact with liquid in pipe, sm; Qcable - weight of 1 km of cable with pipe, kg-wt; Lcable - length of cable to depth of planned delivery of devices, km; Ptear - pressure of liquid in pipe leading to tear of cable, kg-wt/sm2, determined from formula: Ptear=Ftear/Spipe, where Ftear - tear force for cable according to documentation, kg-wt.
EFFECT: higher efficiency.
3 cl, 1 dwg, 1 tbl
SUBSTANCE: device has body, spring-loaded levers jointly connected to it, levers position indicator, made in form of constant magnet mounted at joint connection end of each measuring lever, and signal converter, mounted in body in protective chamber. Constant magnet is made in form of washer and is mounted in circular groove on rotation axis of each lever, and as signal converter magnetic-resistive sensor is used in form of resistive bridge circuit sensitive to direction of magnetic field and non-sensitive to its intensity, while magnetic axis of constant magnet is in plane of washer and is directed perpendicularly to sensitivity axis of magnetic-resistive sensor.
EFFECT: higher precision, simplified construction, lesser dimensions.
FIELD: oil and gas extractive industry.
SUBSTANCE: device has body with ports in lower and upper ends, main sensitive elements in form of turbines and packing elements, placed in pairs at body ends, side port made in body between main sensitive elements and converter, connected to surface equipment. In side pipe, mounted inside the body between main sensitive elements, additional sensitive element is placed in form of turbine and thermal sensor. Lower end of side pipe is connected to side port. Diameter of turbine of additional sensitive element is less than diameter of turbines of main sensitive elements. Converter is a control block mounted above body including sleeves locator and electronic microprocessor device.
EFFECT: higher precision.
FIELD: oil and gas production.
SUBSTANCE: invention relates to gas-liquid systems coming from oil production wells. Mixture is separated into liquid and gas in separator. Liquid is periodically accumulated in separator container and then displaced with gas. During this operation, differential pressure for liquid reaching its lower and upper recorded levels and time required for filling recorded volumes are measured as well as absolute pressure and temperature of gas in container. Liquid flow value expressed in weight is calculated using special mathematical dependence. At oil field, liquid and gas enter separator from preliminary gas intake installation or from the first separation step.
EFFECT: increased accuracy of measurement due to avoided gas density registration and excluded necessity of using strictly cylindrically-shaped measuring container.
FIELD: engineering investigations in building, particularly devices for determining deformation and strength properties of ground in well.
SUBSTANCE: device comprises probe (working tip), control-rod, pipeline, communication line, loading jig and measuring station. Probe includes hollow cylindrical body with bottom and cap filled with working liquid, elastic shell sealed from body bottom and top. Formed in non-fixed elastic shell area are perforations. Piston with rod is installed in upper part of hollow body above working liquid. Rod passes through cap in sealed manner. Rod is connected with control rod so that piston may move in axial direction. Formed above piston is cavity connected to pipeline. Hollow body has bottom in which air-tight plug is installed. Measuring device is made as linear piston displacement transducer. Through orifices are formed in hollow body wall near body bottom. Arranged from body outside are vertical or inclined grooves aligned with through orifices by lower ends thereof. Air-tight plug is provided with adjustable rest for restricting piston stroke.
EFFECT: simplified structure of probe and measuring devices, increased operational reliability and improved validity of obtained data.
2 cl, 1 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.
EFFECT: higher reliability and trustworthiness.
SUBSTANCE: method includes lowering protective container to the well to portion of intensive curvature of shaft, which container is fixed at end of drilling pipes, lowering of geophysical device into protective container on lower portion of logging cable, delivery of protective container with geophysical device to pit-face by consecutive extending of drilling pipes column, lowering of upper portion of logging cable through remote-controlled compactor of logging cable fixed on branch of swivel, into drilling pipes, until electric contact to free end of lower portion of logging cable via detachable connecting sleeve, geophysical examining of shaft during raising of geophysical device together with drilling pipes with appropriate connection-disconnection of fixing ends of lower and upper portions of logging cable when screwing away each following drill stand. When examining wells having extensive steeply slanted portion of well shaft with zenith angle of 50°-90°, where lowering of upper portion of logging cable to electrical contact with free end of lower portion of logging cable via detachable connecting sleeve under its own weight is difficult due to friction at drilling column wall, forced lowering of detachable connecting sleeve is performed by feeding washing liquid under pressure into drilling pipes and concurrent adjustment of pressure in chamber of remote-controlled compactor of logging cable. Pressure in chamber of remote-controlled logging cable compactor is achieved to be close to pressure of washing liquid in drilling pipes, to provide for optimal speed of cable lowering and its pressurization, and after connection of detachable connecting sleeve to lower portion of logging cable during raising and lowering of drilling pipes, examinations of well are performed.
EFFECT: higher efficiency.
FIELD: oil extractive industry.
SUBSTANCE: mixture is separated on liquid and gas in separator. Liquid is periodically collected and forced away by gas while measuring absolute pressure and gas temperature in separator tank near upper and lower fixed liquid levels, and times of forcing away of fixed liquid volume. Additionally measured are absolute pressure and temperature in moment when liquid reaches intermediate fixed level. Then liquid is forced from intermediate fixed level to lower fixed level separator is switched off from well, and mass loss of gas is calculated from provided relation. Device for realization of method consists of separator with feeding pipe, in which a three-drive valve is mounted, and draining pipe, which through said valve is connected to liquid outlet channel and to gas outlet channel. Separator is provided with sensors of temperature and pressure and sensors of upper, intermediate and lower levels, mounted in such a manner, that they separate fixed volumes between each other in separator tank, in case of equality of which calculations are simplified.
EFFECT: higher precision.
2 cl, 1 dwg