Gas well surveying method

FIELD: oil and gas industry.

SUBSTANCE: when surveying a gas well, its head is equipped with a separator, a gas flow rate measuring device and a flow line for flame. Gas pressure and temperature is measured on the installed device and the well flow rate is determined based on performed measurements and structural characteristics of the device. In addition, the well head is equipped with an electric power plant generating electric power at combustion of produced gas. When surveying high-flow-rate wells, the electric power plant is installed between the gas flow rate measuring device and the flame line. When surveying low-flow-rate wells, the electric power plant is installed before the gas flow rate measuring device.

EFFECT: use of produced gas during survey of gas wells for generation of electric power.

 

The invention relates to the field of natural gas production and may be used in the study of gas wells, mostly not connected to pipelines for gathering production wells.

A known method for studying gas wells that are not connected to the gas manifold item, including advanced equipment wellhead separator, a device for measuring gas flow (flow rate), including exemplary gauges and thermometers, and discharge line for the torch. During research well on both stationary and non-stationary modes, measured pressure and temperature gas meter gas flow, which is determined by the flow rate of the well. When this production wells, in the case of the presence of liquids and solids, pre-cleaned from them in the separator, installed in front of the device for measuring gas flow, and gas after this unit enters the flare line and burned. As a device for gas flow measurement most commonly used f-measure of critical flow (PRES), based on the laws of motion of the gas through the aperture when the excess pressure to the diaphragm pressure after not less than two times (Gritsenko, A.I., Aliyev SS, Ermilov O.M., Remizov CENTURIES, Zotov, GA. And what about the research wells. - M.: Nauka, 1995, 523 S.).

The main disadvantage of this method of investigation of gas wells is that all of the gas produced is burned. Study well, especially combined with trial mining of the productive deposits, can last for many days, so in the process of such research burn significant amounts of natural gas.

The technical task of the invention is the use of the produced gas in the research process gas wells to generate electricity.

The technical problem is solved by a method for investigation of gas wells, including equipment wellhead separator, a device for measuring gas flow and discharge line for the torch, measurement of gas pressure and temperature at the installed device and the determination of the flow rate on the basis of measurements and structural characteristics of the device, the wellhead is additionally equipped with a power plant that produces electricity by burning natural gas, and in the study of high capacity wells power plant installed between the device for measuring gas flow and flare line, and in the study of marginal wells power plant installed before the device for measuring gas flow, with deb the t wells is determined taking into account air flow, going to burning gas.

The invention consists in the following.

In the study of gas wells that are not connected to the gas manifold point, the mouth is equipped so as to enable separation of production wells with the aim of separating and measuring quantities of liquid and solid particles in the production wells and to determine the rate of gas wells. To achieve these goals, wellhead equipment includes a separator and a device for measuring the amount of gas in the production wells. As a device for determining the flow rate of gas is widely used PRES, while the flow rate of gas at the critical condition of the expiration is determined by the well-known formula (see Manual..., str-489):

Q=CPDδ/[ρZTD]0,5,

where Q is the flow rate of gas, thousand m3/day; PD- absolute pressure before the orifice, MPa;ρ- the relative density of the gas in the air; TDis the absolute temperature of the gas in front of the diaphragm, °K; Z is the coefficient of sverkhlineinoi gas at PDand TD;- Coefficients is, depending on the diameter of the aperture and Dicta (table option); δ is a correction factor to account for the change of the adiabatic exponent of the real gas. This formula is valid at the expiration of the gas in the atmosphere, i.e. when the pressure after the aperture of 0.1 MPa.

To calculate the flow rate using the above formula in the research process well measured pressure and temperature of the gas in front of the diaphragm.

In the research process well known method of gas after Dicta routed to the flare line and burned. The proposed method offers the wellhead be equipped with an additional power plant, where the gas used to generate electricity. Electricity generated or transported to local needs, or used to charge batteries that can be used in any known purposes or devices that may be specially designed under the new proposal batteries.

In the study of high capacity wells, when provided critical pressure differential between the mouth of the well and the required pressure for the power plant, the latter is preferable to place after measuring device (Dicta). If you are installing a power plant according to their design characteristics may not use the entire d is livemy gas, excess gas sent to flare.

In the study of marginal wells, when the wellhead pressure do not provide the critical pressure drop, power plant have before measuring device, and the gas flow rate is determined on the basis of determining the flow rate of combustion products with regard to flow of air going to the combustion gas. So, from the formula for the combustion of methane (CH4+2O2=CO2+2H2O) it is known that the combustion of 1 volume of methane requires 2 volume of oxygen or (2·1/0,21≈9.5) is 9.5 volumes of air (oxygen in air is 21%), therefore, when determining the flow rate of gas (mainly methane) at the measuring device after the combustion gas at the power plant take into account that the flow rate of the gas is 0,095 (1/10,5) proportion of the total measured volume of products of combustion of gas. In this case, the measuring device can be used with devices that do not require critical differential pressure, for example, zipmanager (see Manual..., str-487).

As power plants can be used, for example, aggregates of well-known manufacturing company "RYBINSKKOMPLEKS" brand AGP. The required gas pressure at the entrance of these power plants is not less than 0.5 MPa, so when using Dicta and install it before you power need wellhead pressure above 1 MPa, and the mustache is the time named the plant before measuring device allows the use of the described method when the minimum wellhead pressure (without taking into account the pressure drop across the separator) 0.5 MPa.

An example implementation of the method

A study was conducted on a gas well by the method of the steady-state auditions for the 5 modes "forward stroke" and 2 reverse modes, were determined gas flow rate measuring device in the following amounts: 40, 80, 125, 150, 180, 120 and 60 thousand m3/day. The duration of the study wells in each mode was 1 hour. As a result, over time, research well produced 31,46 thousand m3gas. In the complex equipment used in the study wells consisted of gas-piston power plant AGP-350 installed after measuring device. Specific gas consumption of this plant at nominal capacity (350 kW/h) is 125,2 m3/h, in the result during the study wells was used 876,6 m3the produced gas (the rest of the gas burned in the flare) and developed (350·7) 2450 kW of electricity. With the appropriate power plant with full use of the produced gas from the well with similar specific consumption would be obtained 87927 kW of electricity, which is enough to provide electricity, for example, a small residential complex with a load of 20 kW/h for 183 days.

When using this approach, studies of gas wells, in addition to information about gas deposits, there prob is a possibility to get significant amounts of electricity, while also addressing the issues of rational use of mineral resources and energy consumption.

The method of investigation of gas wells, including equipment wellhead separator, a device for measuring gas flow and discharge line for the torch, measurement of gas pressure and temperature at the installed device and the determination of the flow rate on the basis of measurements and structural characteristics of the device, while the wellhead is additionally equipped with a power plant that produces electricity by burning natural gas, and in the study of high capacity wells power plant installed between the device for measuring gas flow and flare line, and in the study of marginal wells power plant installed before the device for measuring gas flow, and the flow rate is determined taking into account the air flow going on the combustion gas.



 

Same patents:

FIELD: mining.

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EFFECT: improving objectivity of evaluation of production capabilities of wells and composition of the field fluid transported via pipes.

2 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves excitation of a well, measurement of parameters by means of bottomhole instrument installed inside perforated tubing in horizontal sections of the well with different geophysical characteristics and processing of measurement results. As bottomhole equipment, remote instruments are used, which are connected to each other by means of a geophysical cable; geophysical cable is led out by means of an outlet adapter from the tubing string to the inter-tube space. In vertical part of the well there installed is a borehole pump, and a downhole pump equipment is lowered together with the lowered geophysical cable. At that, the geophysical cable is fixed on the tubing string with belts; the cable is led out to the surface through a process hole made in a tube holder, where it is sealed and connected to a surface recording unit.

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1 dwg

FIELD: oil and gas industry.

SUBSTANCE: when the method is being realised, at least one container is installed on the lowered equipment and then lowered to the well to the pre-determined distance from the well head and it includes a tracer mark, with further monitoring of wellbore fluid or gas for content of the tracer mark. The container housing is made from the material capable of being dissolved or decomposed under action of water or gas and resistant to action of hydrocarbon medium.

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FIELD: oil and gas industry.

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2 cl, 2 dwg

FIELD: oil and gas industry.

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2 dwg

FIELD: oil and gas industry.

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20 cl, 12 dwg

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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2 dwg

FIELD: oil and gas industry.

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2 cl, 2 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: telemetric system is proposed for monitoring of bottomhole parameters, using a pipe string for transfer of data with the help of an acoustic field, which comprises a surface module of reception and processing of a signal and a bottomhole module lowered into the pipe string, and the bottomhole module includes a unit of measurement of bottomhole parameters, a unit of control of a bottomhole module, a unit of an acoustic generator, a device of connection and disconnection with a pipe from the pipe string, an actuating mechanism, and also a power supply unit. The actuating mechanism is made as capable of providing a direct acoustic contact with the surface of the internal wall of the pipe by means of pressing of an element to it, which is made of a material with hardness exceeding the hardness of the pipe material, with introduction of the latter into the material of the pipe wall. The surface module of reception and signal processing is made with a function of registration of parameters of an information signal received in one or several different frequency ranges, and with a function of detection of working frequency ranges of the acoustic field by means of their selection inside frequency bands, where the level of natural and structural noise in the field of reception of the information signal on the surface is minimal relative to the level of the specified noise in other frequency bands.

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FIELD: mining industry.

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FIELD: oil and gas extractive industry.

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EFFECT: broader functional capabilities, higher reliability.

4 dwg

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

Profile meter // 2244120

FIELD: geophysics.

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.

3 dwg

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.

1 dwg

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.

1 dwg

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.

1 ex

FIELD: geophysics.

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.

1 dwg

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

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