System and method for assessment of bed parametres

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil production industry and is intended to assess parametres of underground bed, having primary fluid and contaminated fluid. In order to produce fluids from bed, fluid is extracted into at least two inlet holes. At least one assessment diverting line is connected by fluid with at least one of inlet holes for movement of primary fluid into well instrument. At least one cleaning diverting line is connected by fluid with inlet holes for passage of contaminated fluid into well instrument. At least one circuit of fluid is connected by fluid with assessment diverting line and/or with cleaning diverting line for selective extraction of fluid in it. At least one hydraulic connector is used to selectively pull hydraulic pressure between connecting lines. At least one detector is used to measure well parametres in one of diverting lines. In order to reduce contamination, fluid might be selectively pumped along diverting lines into assessment diverting line.

EFFECT: provision of flexibility and selectivity to control fluid flow through well instrument by detection, reaction and removal of contamination.

23 cl, 30 dwg

 

The present invention relates to methods for the evaluation of the parameters of the underground reservoir downhole tool positioned in a wellbore traversing a subterranean formation. More specifically, the present invention relates to a method for reducing contamination of fluids extracted in the downhole tool and/or measured by the downhole tool.

Wells are drilled for the discovery and production of hydrocarbons. Downhole drilling tool with a chisel on the end is pushed into the ground for the formation of the wellbore. While drilling tools promote, to cool the drilling tool and debris out of doors for drilling through drill tool pumped drilling fluid, which exits the drill bit. Fluid exits the drill bit and back to the surface for recirculation through the tool. Drilling mud is also used to form the filtration crust to cover the wellbore.

During drilling operations it is desirable to perform various evaluation parameters of the formations traversed by the wellbore. In some cases, the drilling tool may be provided with a device for measuring and/or sampling from the surrounding formation. In some cases, the drilling tool can be removed, and the descent on the cable tool, the t can be placed in the wellbore for measuring and/or sampling from the reservoir. In other cases, the drilling tool can be used to perform measurement or sampling. These samples, or samples, can be used, for example, for the detection of valuable hydrocarbons.

For estimation of reservoir parameters often requires removing fluid from the formation into the downhole tool for measuring and/or sampling. Various devices, such as probes, push from the downhole tool to create a flow of fluids from the formation surrounding the wellbore, and to extract the fluid in the downhole tool. A typical probe is a circular element raised from the downhole tool and positioned opposite the side wall of the wellbore. Rubber packer on one end of the probe used to create the seal relative to the side wall of the wellbore. Another device used for the formation of the seal relative to the side wall of the well bore, called the dual packer. In the case of the double packer two elastomeric rings extend radii around the tool to isolate the portion of the wellbore between them. Rings form a seal relative to the wall of the wellbore and provide the ability to extract fluid in the isolated portion of the wellbore and to the inlet of the downhole tool.

The floor of the trunk schweinefleisch crust is often useful to promote sealing of the probe and/or dual packer relative to the wall of the wellbore. After the seal is made, the reservoir fluid extract in the downhole tool through the inlet opening by lowering the pressure in the downhole tool. Examples of probes and/or packers, used in downhole tools are described in U.S. patents№№6301959, 4860581, 4936139, 6585045, 6609568 and 6719049 and in the application for U.S. patent No. 2004/0000433.

The formation evaluation is usually performed on the fluids extracted in the downhole tool. Currently, there are methods of performing various measurements, preliminary testing and/or sampling fluids that come in the downhole tool. However, it has been found that the passage of well fluid into the downhole tool of various pollutants, such as wellbore fluid and/or drilling fluid can enter into the tool along with formation fluids. These pollutants can affect the quality of the measurements and/or samples of reservoir fluids. In addition, contamination may be the cause of costly delays when performing downhole operations due to the need of spending extra time for additional measurements and/or sampling. In addition, such problems can lead to incorrect results that are wrong and/or useless.

Therefore, to obtain wealthy measurement result, it is desirable that lastby fluid, included in the downhole tool, was quite "clean" or "primary". In other words, wireline fluid should be a little dirty or not dirty. Attempts have been made to prevent the entry of contaminants into the downhole tool together with the reservoir fluid. For example, as shown in U.S. patent No. 4951749, in the probe set filters to prevent the release of pollutants into the downhole tool together with the reservoir fluid. In addition, as shown in U.S. patent No. 6301959 (Hrametz), probe provide a protective ring for the discharge of contaminated fluids at a distance from the clean fluid when it enters the probe.

Despite the availability of methods for evaluation of reservoir parameters and attempts to deal with the pollution remains a need in the management of the flow of fluid through the downhole tool for reducing pollution, when it enters and/or passes through the downhole tool. It is desirable that such methods it was possible to divert contaminants away from the pure fluid. In addition, it is desirable that such methods could be implemented, among other things, analysis of the fluid passing through the bypass line, the selective control of flow of fluid through the downhole tool, responding to detected contamination, removal of contamination and/or flexibility in the management of fluids skvazhina the tool.

According to the invention a system of evaluation of aquifer parameters for a downhole tool located in a borehole traversing a subterranean formation having a primary fluid and a contaminated fluid containing at least two inlet device for receiving fluid from the reservoir, at least one estimated discharge line connected to the fluid with at least one inlet device for the passage of the primary fluid into the downhole tool, at least one sewage treatment discharge line connected to the fluid with at least one inlet device for the passage of contaminated fluid into the downhole tool; at least one fluid circuit, connected in fluid with at least one evaluative outlet line, at least one cleaning drain lines and their combinations for the selective extraction of fluid in it, at least one hydraulic connector to selectively create a hydraulic connection between the at least one estimated bypass line, and at least one cleaning the drain line and at least one sensor for measuring downhole parameters in one of the at least one estimated the drain line, at one cleaning drain lines and their combinations.

The system may additionally sod is neigh device for fluid flow, retractable from the housing for sealing engagement with the wall of the borehole and having at least two inlet fixture passing through it.

At least one hydraulic connector can be configured to pass fluid from the area upstream of at least one estimated the drain line to the area downstream of at least one cleaning the drain line or transmission fluid from the area upstream of at least one cleaning the drain line to the area downstream of at least one selected drain lines and their combinations.

At least one hydraulic connector can be connected to bypass lines at the location upstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

At least one hydraulic connector can be connected to bypass lines at the location downstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

The system may further comprise at least one balancing valve passing from one of the at least one estimated the drain line, at least one cleaning lines and combinations of them to join him on the fluid with the ox well.

At least one circuit of the fluid may contain at least one pump, at least one selected cell and at least one valve for selectively advancing fluid through the downhole tool.

At least one sensor may be configured to measure properties of the fluid in at least one of the estimated drain line cleaning drain lines and their combinations.

The system may further comprise at least one piston preliminary tests, functionally connected with one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

The system may further comprise at least one isolation valve to allow selective flow of fluid through one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

According to the invention established method of estimating the parameters of the subterranean formation having a primary fluid and a contaminated fluid, comprising the following operations:

location in the wellbore traversing a formation downhole tool having at least two inlet device, configured to extract fluid in at least one estimated CTE is dnow line and at least one sewage treatment discharge line in the downhole tool;

selective extraction of fluids in one of the at least one estimated the drain line, at least one cleaning the drain line, and combinations thereof;

selective creation of a hydraulic connection between the at least one estimated the drain line and at least one cleaning the drain line;

measuring downhole parameters of fluids in one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

The method may further include passing the fluid through the fluid circuit. Fluid can be pumped into the fluid circuit at least one pump.

The operation of the electoral create a hydraulic connection can contain one of the following operations: transmission fluid from the area upstream of at least one estimated the drain line to the area downstream of at least one cleaning the drain line, the transmission fluid from the area upstream of at least one cleaning the drain line to the area downstream of at least one appraisal outlet line, a combination of these operations.

The operation of the electoral create a hydraulic connection may include a connection of drainage lines on site upstream from one of the shut-off valve appraisal outlet line, suporn the th valve cleaning drain lines and their combinations.

The operation of the electoral create a hydraulic connection may include a connection of drainage lines on site downstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

The method may additionally include electoral creating a flow of fluid between the wellbore and one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

The method may additionally include an analysis of the measured downhole parameters. Downhole parameters drop lines can be compared. The measured downhole parameter may be a pressure differential between at least estimated, and at least one cleaning drain lines.

The downhole tool may further comprise numerous paths of fluid connected to at least one of the branch lines, each fluid circuit has at least one pump, and operation of extraction contains selective injection of fluids into one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

Pumps can be selectively operate to prevent the inflow of contaminated fluid in the estimated discharge line.

Ways which may optionally include pumping fluid from the evaluation of the soil line in at least one selected cell.

For a better understanding of the above features and advantages of the present invention the following is a more detailed description of the embodiments of the invention, which are illustrated by the attached drawings. However, it should be noted that the appended drawings illustrate only typical embodiments of this invention, and they should not be considered limiting of its scope, for the invention may be permitted other, equally effective ways of implementation.

In the drawings shows the following:

figure 1 depicts a schematic view, partially in section, of the downhole tool for estimation of aquifer parameters in the wellbore adjacent to a subsurface reservoir;

figure 2 - schematic view of part of the downhole tool for estimation of aquifer parameters, shown in figure 1, showing the system of the movement of fluids for receiving fluid from the surrounding formation;

figure 3 is a detailed schematic view of the downhole tool and system fluid flow, shown in figure 2;

figure 4A is a graph illustrating the flow rate of fluid through the downhole tool shown in figure 2, when using synchronized pumping;

figure V-4B4 depict schematic views of the flow of fluid through the downhole tool shown is figure 2, in points A-D time respectively, as shown in figure 4A;

figure 5A is a graph illustrating the flow rate of fluid through the downhole tool shown in figure 2, when using synchronized pumping;

figure V-4 - schematic views of the flow of fluid through the downhole tool shown in figure 2, points A-D time respectively, as shown in figure 5A;

figure 6A is a graph illustrating the flow rate of fluid through the downhole tool shown in figure 2, when using partially synchronized pumping;

figure V-4 - schematic views of the flow of fluid through the downhole tool shown in figure 2, points A-D time respectively, as shown in figure 6A;

figure 7A is a graph illustrating the flow rate of fluid through the downhole tool shown in figure 2, when using mismatched synchronized pumping;

figure 7V1-5 - schematic views of the flow of fluid through the downhole tool shown in figure 2, points A-E time respectively, as shown in figure 7A;

figure 8A is a graph illustrating the flow rate of fluid through the downhole tool shown in figure 7A, and illustrating the flow in the selected camera;

figure V-5 - schematic views of the flow of fluid through the well is th instrument, shown in figure 2, points A-E time respectively, as shown in figure 8A.

Preferred in the present embodiments of the invention shown in the above drawings and described in detail below. In the description of the preferred embodiments the same or identical positions used to describe a common or similar elements. For clarity and brevity, the drawings are not necessarily made to scale and certain features and certain views of the drawings can be scaled up or schematically.

The figure 1 shows a downhole tool, suitable for use with the present invention. Can be used in any downhole tool to perform the estimation of reservoir parameters, such as the descent to the drill string, the descent on the flexible tube of small diameter or other downhole tool. The downhole tool shown in figure 1, is a normal descent on the cable tool 10 is lowered from the drilling rig 12 into the wellbore 14 wells with the cable 16 and positioned near the reservoir F. the Downhole tool 10 is equipped with a probe 18, configured to create a seal relative to the wall of the wellbore and extracting fluid from the formation into the downhole tool. Also depicted on eunie packers 21 to illustrate, that the various devices in the communication fluid, such as probes and/or packers can be used to extract fluid into the downhole tool. Reference pistons 19 promote the downhole tool and the probe to the wall of the wellbore.

The figure 2 presents a schematic view of part of the downhole tool 10 illustrating the system 34 to fluid movement. Preferably, the probe 18 is moved from the downhole tool prior to engagement with the wall of the wellbore. The probe is equipped with a packer 20 to create a seal relative to the wall of the wellbore. The packer is in contact with the wall of the well bore and forms a seal relative to the filter cover 22 covering the wellbore. Filtration cork seeps through the wall of the wellbore and creates around the wellbore zone 24 of penetration. Penetration zone contains drilling mud and other downhole fluids that contaminate the surrounding layers, including the layer F and the portion of the formation fluid 26 contained therein.

Preferably, the probe 18 has been provided with at least two drainage lines, estimate the discharge line 28 and cleaning the drain line 30. It should be clear that when using double packers, between them can be formed by the inlet device to retrieve the treatment fluid in the evaluation and treatment discharge line. Examples of devices for flow of fluids, such as probes and dual packers are used to extract fluid in a separate discharge line, as described in the application 6719049 on the U.S. patent and published application No. 20040000433 on U.S. patent, assigned to the assignee of the present invention, and in U.S. patent No. 6301959, assigned Halliburton.

Estimated delivery line is in the downhole tool and is used for the passage of the clean downhole fluid in the downhole tool for measuring and/or sampling. Estimated delivery line is in the selected chamber 35 which is used to collect samples of formation fluids. At the same time a bypass line 30 is held in the downhole tool and is used to extract the contaminated fluid away from the clean fluid flowing in the estimated discharge line. The contaminated fluid may be discharged into the well bore through the outlet 37. One or more pumps 36 can be used to promote fluid through bypass lines. Preferably, between the estimated and cleaning drainage lines was located a separator or barrier to separate the fluid flowing in them.

The figure 3 depicts the system 34 of the fluid flow. As can be seen in this figure, the fluid is extracted in the evaluation and treatment discharge line through the probe 18. When the fluid flows in Ann the instruments, the contaminated fluid in the zone 24 of penetration (figure 2) ends, so that the estimated discharge line 28 may include pure fluid 26 (figure 3). As shown by the arrows, the contaminated fluid is removed in sewage treatment discharge line on the estimated distance from the drain line. In figure 3 the probe shown with clean discharge line, which forms a ring around the surface of the probe. However, it should be clear that can be used in other configurations of one or more inlets and drainage lines passing through the probe.

Evaluation and treatment discharge lines 28, 30 pass through the probe 18 and 34 of the fluid flow downhole tool. As described in the present application additionally, the evaluation and treatment discharge lines are in the polling message to the fluid drainage lines that flow through the system fluid flow. System fluid flow includes a set of devices to control the flow of clean and/or contaminated fluid when it passes through the downhole tool from upstream reservoir near to the place downstream. The system comes with a set of devices for measuring fluid and/or control fluid, such as discharge line 28, 29, 30, 31, 32, 33, 35, the pumps 36, the pistons 40 preliminary tests, selected chamber 42, the valve 44, the hydraulic connectors 48, 51 and Attiki 38, 46. In addition, the system can be equipped with a set of additional devices, such as valves, diverters, devices for processing and other devices to control the flow and/or perform various operations on evaluation of reservoir parameters.

Estimated delivery line 28 passes from the probe 18 and the fluid is connected with drainage lines passing through the downhole tool. Preferably, the estimated delivery line 28 was provided with a piston 40A preliminary tests and sensors, such as pressure gauge 38A and the analyzer 46a fluid. At the same time a bypass line 30 passes from the probe 18 and the fluid is connected with drainage lines passing through the downhole tool. Preferably, the treatment line 30 was provided with a piston 40b preliminary tests and sensors, such as pressure gauge 38b and the analyzer 46b fluid. Sensors, such as pressure gauge 38 may be connected to the evaluation and treatment drainage lines 28 and 30 for measuring the parameters between them, such as differential pressure. Optionally, such sensors can be installed at other locations along any of the branch lines of the system of fluid movement.

One or more pistons preliminary tests can be provided to extract the fluid in the tool and perform the operation preliminary tests. Preliminary ispy is the W is usually performed to obtain a curve of pressure, reflecting the falling and rising pressure in the drain line when fluid is drawn into the downhole tool via the probe. When used in combination with a probe having the evaluation and treatment discharge lines, the piston preliminary tests may be installed along each bypass line to obtain the characteristic curves of the reservoir. These characteristic curves can be compared and analyzed. In addition, the pistons preliminary tests can be used to extract fluid in the tool to destroy the mud cake on the wall of the wellbore. Pistons can work cycles simultaneously or at different speeds to align and/or create a pressure differential at the ends of the respective branch lines.

Pistons preliminary tests can also be used to diagnose and/or detect problems during operation. When the pistons are working cycles with different speeds can be determined the integrity of the insulation between the lines. When the change in pressure at the ends of the bypass line is reflected at the second outlet line, this may indicate that between drainage lines there is insufficient insulation. The lack of isolation between drainage lines may indicate that between drainage lines there is an insufficient seal. Countdown the pressure at the ends of branch lines during the cyclic operation of the pistons can be used to help diagnose any problems or to confirm sufficient roadworthiness.

System fluid flow can be equipped with a hydraulic connectors, such as the bypass node 48 and/or the node 51 branching, for passing fluid between the estimated and cleaning drainage lines (and/or drainage lines attached to the fluid). These devices can be installed at various locations along the system fluid movement to divert fluid flow from one or more drop lines in the right components or parts of the downhole tool. As shown in figure 3, the rotary bypass node 48 may be used to join the estimated fluid outlet line 28 with the outlet line 32 and cleaning the drain line 30 with the outlet line 29. In other words, the desire of fluid from the branch lines can be selectively allocated between the various drainage lines. For example, fluid can be withdrawn from the outlet line 28 in the circuit 50b of the flow, and the fluid can be withdrawn from the outlet line 30 in the circuit 50A of the flow.

Node 51 branching shown in figure 3, contains several valves 44a, b, c, d, and connected with the connecting drainage lines 52 and 54. Valve 44a allows passage of fluid from the outlet line 29 connecting the discharge line 54 and/or through the outlet line 31 in the circuit 50A of the flow. The valve 44b allows passage of fluid from the outlet line 32 in soy is intelnal the discharge line 54 and/or through the outlet line 35 in the circuit 50b of the flow. Valve s provides the possibility of leakage of fluid between drainage lines 29, 32 upstream from the valves 44a and 44b. Valve 44d provides the possibility of leakage of fluid between drainage lines 31, 35 downstream from the valves 44a and 44b. This configuration provides the selective mixing of fluid between the estimated and cleaning drainage lines. This can be used, for example, for selective transmission of fluid from the drainage lines in one or both circuit 50a, b of the selection.

In addition, the valves 44a and 44b can be used as isolation valves to isolate the fluid in the outlet line 29, 32 from the rest of the system fluid movement, located downstream from the valves 44a, b. Isolation valves close to isolate a fixed volume of fluid within the downhole tool (i.e. drop in the lines between the reservoir and the valves 44a, b). Fixed volume located upstream from the valve 44a and/or 44b, is used to perform downhole measurements, such as pressure and mobility.

In some cases, such as during sampling, it is desirable to maintain the separation between assessment and treatment drainage lines. This can be accomplished, for example, by closing valves s and/or 44d to prevent passage of fluid between drainage lines 29 a or 31 and 35. In other cases, the message on the fluid between drainage lines may be desirable to perform downhole measurements, such as reservoir pressure and/or generate estimates of mobility. This can be accomplished, for example, by closing valves 44a, b, opening valves s and/or 44d, to allow the flow of fluid through bypass lines 29 and 32 or 31 and 35, respectively. When fluid flows in the discharge line, pressure gauges installed along the drainage lines, can be used to measure pressure and determining changes in the volume and flow at the interface between the probe and the wall of the reservoir. This information can be used to obtain mobility in the reservoir.

The valve 44c, d can also be used to allow the passage of fluid between drainage lines within the downhole tool to prevent the pressure differential between drainage lines. In the absence of such a valve, the differential pressure between drainage lines can cause leakage of fluid from one outlet line, through the formation and back to another gate line in a downhole tool that can distort measurements, such as mobility and pressure.

Node 51 branching can also be used to isolate parts of the system of fluid flow downstream from the part with the system fluid movement upstream. For example, the node 51 branching can be used for the passage of fluid from the space upstream from the branching node to other parts of the downhole tool, for example through the valve 44j and the discharge line 25, thus bypassing paths of fluid flow (i.e. when closing valves 44a, b). In another example, when closing valves 44a, b and opening the valve d this configuration can be used to allow the passage of fluid between circuits 50 of the fluid and/or other parts of the downhole tool through the valve 44k and the outlet line 39. This configuration can also be used to allow the passage of fluid between the other components and paths of fluid flow without messages fluid to the probe. This can be useful in cases, for example when there are additional components such as additional probes and/or modules of the contours of the fluid downstream from the branching node.

In addition, the node 51 branching can work so that the valves 44a and 44d are closed and 44b and 44d open. In this configuration, fluid from both branch lines can be carried from place upstream from node 51 branching in the discharge line 35. Alternatively, the valve 44b and 44d may be closed, and 44a and is open so that fluid from both branch lines can be carried from place to enter the flow from node 51 of the fork in the outlet line 31.

Preferably, the circuits 50A and 50b of the flow (sometimes called contours sampling or contours fluid) contained the pumps 36, selected chamber 42, the valve 44 and the associated discharge line to selectively move the fluid through the downhole tool. Can be used one or several paths of flow. For illustration depicts two different flow, but can be used the same paths or other paths of flow.

A bypass line 31 passes from node 51 branch to loop 50A of the flow. Valve 44th provided to enable selective inflow fluid path 50A of the flow. Fluid can be withdrawn from the outlet line 31, omit valve 44th in the discharge line a and released into the well through outlet 56. Alternatively, fluid can be withdrawn from the outlet line 31, omit valve 44th through the outlet line a in the valve 44f. Pumps a and a can be provided in branch lines a and a respectively.

The fluid passing through the bypass line a, can be abstracted using valve 44f into the well through outlet line 33b1 or valve 44g outlet on line 33b2. Pump 36b can be installed in the drain line 33b2.

The fluid passing through the bypass line 33b2, may be passed through valve 44g in the discharge line s or otadn the th line s. For discharge in the discharge line s fluid may be passed through valve 44h into the well through outlet line or 33d1 back on the drain line 33d2. For discharge through outlet line s fluid is collected in a selected chamber 42A. Buffer bypass line 33d3 passes into the well and/or is connected to fluid outlet line 33d2. Pump 36C installed in the drain line 33d3 for fluid through it.

The circuit 59b stream is valve 44th' to allow selective flow of fluid from the outlet line 35 in the circuit 50b of the flow. Fluid can flow through the valve 44th' in the discharge line s' or in the discharge line s' and selected chamber 42b. The fluid passing through the bypass line s', may be passed through valve 44g' in the discharge line 33d1' and issued in the hole or in the discharge line 33d2'. Buffer bypass line 33d3' passes from the selected camera 42b into the borehole and/or fluid connected to the outlet line 33d2'. Pump 36d installed in the drain line 33d3' to extract fluid through it.

For a path of flow control you can use several flow configurations. For example, may include additional selected camera. One or more pumps can be installed in one or more branch lines throughout the circuit. Several valve devices and associated drainage lines can is about to provide to enable the injection and discharge of the fluid in the selected camera and/or in the wellbore.

As shown in figure 3, the contours of the thread can be close. Alternatively, all of the flow paths or portions of paths threads can be placed around the well and connected by a fluid through branch lines. In some cases, parts of the paths of the flows (and other parts of the tool, for example, the probe can be placed in modules that can be combined in various configurations for the formation of the downhole tool. Numerous paths and threads can be included in several specific locations and/or configurations. One or more drop lines can be used for connection with one or more flow paths throughout the downhole tool.

Balancing valve 44i and the associated bypass line 49 is connected with the outlet line 29. One or more of such valve can be installed along the evaluation and/or treatment of drainage lines for equalizing the pressure between the outlet line and the well. This alignment allows equalization of pressure differential between the inner side of the tool and the borehole so that the tool will not prihvatyvaya layer. In addition, the trim bypass line helps to ensure that there is release of fluid under pressure and gases from the interior of taking the line, when it is lifted to the surface. Such a valve may be provided at various locations along one or more drop lines. Can introduce a large number of valve, especially when the predicted pressure should be locked on a large number of places. Alternatively, the instrument can be equipped with other valves 44, so they automatically opened to allow equalization of pressure on a large number of places.

Multiple valves can be used for guiding and/or controlling the flow of fluid through the discharge line. Such valves can be shut-off valves, relief valves, flow limiters, surge, duct or discharge valves and/or other devices capable of regulating the flow of fluid. Valves 44a-k can be a two-position valves which provide selective flow of fluid through the drain line. However, they can also be valves that allow flow through her stream of limited value. The bypass node 48 is an example of a valve that can be used to move the flow from the valuation outlet line 28 in the first select circuit and the flow of cleaning the drain line, the second select circuit, and for the eat to switch samples flowing in the second select circuit, and cleaning the drain line to the first selected path.

One or more pumps can be installed in the bypass line to control by the fluid flow. Install the pump in a specific location can be used to promote fluid through certain parts of the downhole tool. In addition, the pumps can be used for selective advancement of the fluid through one or more bypass lines with the desired speed and/or pressure. Control of pumps can be used to assist in determining well characteristics of the layer, such as the pressure of the formation fluid, the mobility of the formation fluid, etc. Usually the pump is set to a bypass line and valve device could be used to control the flow of fluid through the system. For example, one or more pumps may be located upstream and/or downstream from certain valves, choice of cameras, sensors, gauges or other devices.

The desire to extract the fluid in each discharge line pumps can operate selectively and/or consistently. For example, the speed of the pump discharge connected with cleaning the drain line may be increased, and/or the speed of the pump discharge, United ocenochnoe outlet line, may be reduced so that the amount of fluid extracted to estimate the discharge line, was optimized. In addition, one or more of these pumps can be installed along the outlet line to selectively increase the speed of discharge of the fluid flowing through the bypass line.

Can be provided by one or more sensors, such as analyzers 46a, b of the fluid (i.e. analyzers fluid is described in U.S. patent No. 4994671, assigned to the assignee of the present invention) and the gauges 38a, b, c. The set of sensors can be used for determining downhole parameters, such as content, levels of pollution, chemical parameters (for example, the percentage of certain chemicals/substances), hydro-mechanical (viscosity, density, percentage of certain phases and so on), electromagnetic (e.g., electrical resistivity, thermal (e.g., temperature), dynamic (e.g., volume or mass flow), optical (absorption or emission), radiation, pressure, temperature, salinity, pH, radioactivity (gamma and neutron radiation and the spectral energy), carbon the composition and clay content, oxygen content and/or among other data relative to the fluid and/or related conditions of the well. The sensor data may be gathering information, transfer to the surface and/or processing in the well.

Preferably, one or more sensors have a pressure gauge 38, established in the evaluation of the soil line (38A), in cleaning the drain line (38b) or between the two lines (38c) for measuring differential pressure. Additional gauges can be installed at various locations along the drainage lines. The gauges can be used for comparing the pressure levels in the respective branch lines, to detect malfunctions or for other analytical and/or diagnostic purposes. Measurement data can be collected, transmitted to the surface and/or processed in the well. These data alone or in combination with data from sensors can be used to determine the state of the well and/or for decision making.

One or more selected cameras can be installed at various locations along the drain line. For simplicity schematically shows only the selected camera with the piston in it. However, it should be clear that it is possible to use a set of one or more selected cameras. Selected cameras can be linked with drainage lines to other selected cameras, to other parts of the downhole tool to the borehole and/or other charging cameras. Examples of selected cameras, and against Amasa to him configurations can be found in the patent application and in U.S. patent No. 2003042021, 6467544 and 6659177, assigned to the assignee of the present invention. Preferably, the selected cameras were installed to collect clean fluid. In addition, it is desirable that the location of the selected cameras provide effective and high quality supply of clean formation fluid. Fluid from one or more drop lines can be assembled in one or more selected cells and/or dropped into the well. In particular, it is not necessary to connect the selected camera to cleaning the drain line, which may contain contaminated fluid.

In some cases, the choice of camera and/or certain sensors, such as the fluid analyzer can be installed near the probe and/or upstream from the pump. Often it is advantageous to measure the characteristics of the fluid at a point close to the reservoir or to the source of fluid. Also, it may be advantageous to perform measurements and/or sampling upstream from the pump. Usually the pump mixes the fluid passing through the pump. This mixing may cause scattering of impurities in the fluid passing through the pump, and/or increase the amount of time before a pure sample can be obtained. When measuring and sampling upstream from the pump is mixing and dispersion of impurities can be excluded.

Preferably, for the election shows the I action of the various devices in the system was provided with a computer or other processing equipment. The processing equipment can be used for the collection, analysis, composition, transmission, response and/or other processing of borehole data. The downhole tool may be configured to execute commands in response to a signal processor. These commands can be used to perform work in the well.

In the process, the downhole tool 10 (figure 1) is placed near the wall of the well bore and push the probe 18 to form a seal relative to the wall of the wellbore. Supporting the piston 19 is pulled to the promotion of the downhole tool and the probe in the engaged position. One or more pumps 36 in the downhole tool to selectively actuate to extract fluid in one or more drop lines (figure 3). The fluid is extracted in the discharge lines of pumps and valves is routed to the desired lateral lines.

In figures 4A-B shows the flow into the fluid in the probe, with several branch lines, such as the system fluid movement from figures 2 and/or 3. These drawings illustrate how to control the flow of fluid in the downhole tool implemented to facilitate the flow into a clean fluid in the evaluation gate line and reduce pollution. Each figure shows the movement of the fluid in the probe 18 and under estimated the drain line 28 and cleansing the outlet line 30. The pumps 60, 62 are connected functionally with drainage lines 28, 30, respectively, to eject fluid through them. The pump 62 operates at a higher speed compared with the estimated pump 60. However, it should be clear that the pumps can operate at the same speed, or cleansing the pump can operate at a higher speed compared with the estimated pump. For illustration, only one pump is shown for each bypass line. However, in any bypass line can be used any number of pumps. These pumps may be the same as the pumps 36 of figure 3.

Shown in figures 4A-V pumps 60, 62 are in unsynchronized mode. Figure 4A shows a graph of the velocities Q flow (y-axis) depending on time t (on the x axis) of the fluids passing through the estimated bypass line 28 and cleaning the drain line 30, presents the curves 66 and 64, respectively. On the figures V-B4 shows the operation of pumps and flow of fluids into the probe at points A-D time, respectively, according to the schedule in figure 4A.

At the moment And time to figure 4, both pumps are running and remove the fluid in the appropriate evaluation and treatment discharge line. As shown in figure A, part of the formation fluid passes in the evaluation gate line, and a portion of the fluid passes to the treatment the discharge line. It is preferable that, as shown by the arrows contaminated fluid 24 is removed in sewage treatment discharge line with the so that only clean fluid 26 proceeded to estimate the discharge line.

At the moment In time in figure 4A cleansing the pump stops, but the estimated pump continues pumping. From the respective flow rates of the pumps at the moment In time shows that the speed of 64 flow through sewage treatment discharge line drops, while the speed 66 flow estimated through the discharge line is saved. As shown in figure V, the contaminated fluid is no longer returned to the treatment the discharge line and is at the distance estimated from the drain line. In this case, as shown by the arrows, polluted and clean fluids can be estimated in the discharge line.

At the moment With time in figure 4A, both the pump pumps out and speed 64 thread treatment line increases. As shown in figure A, the work of both pumps is returned to the previously described relative to the moment And time.

At the time D time figure 4A cleansing pump pumps, but the estimated pump stops. From the corresponding flow rates at the time D time shows that the speed of 64 flow through sewage treatment discharge line is preserved, while the flow rate of 66 estimated through the discharge line drops. As shown in figure V, the fluid no longer is extracted to estimate the discharge line. In this case, as shown by the arrows, polluted and clean fluids can imagepaths treatment in the discharge line.

Shown in figures 5A-B pumps 60, 62 are in the synchronized mode. These figures are similar to figures 4A-B, except that both pumps are turned off at points b and D of time. At points b and D time figure 5 both speed 64A, 66A flows fall, when the pumps stop. As shown in the figures L and 4, the fluid ceases to flow in each of the branch lines, when the pumps stop.

Shown in figures 6A-B pumps 60, 62 are partially synchronized mode. These figures are similar to figures 4A-B, except that both pumps are turned off at the moment In time. At the moment In time in figure 6A, both the speed 64b, 66b flows fall, when the pumps stop. As shown in figure V, the fluid ceases to flow in each of the branch lines.

Shown in figures 7A-B pumps 60, 62 are in mismatched synchronized mode. Figures 7A-B similar to figures 4A-B, except that in the moment In time cleansing the pump is enabled and the estimated pump off at the moment With time both pumps are turned off, and at the time D time cleansing the pump is enabled and the estimated pump is turned off. In addition, additional time E time is shown for two of the included pump. From the resulting curves s, s on figure 7A shows that the rate of flow through sewage treatment discharge line drops at the moment With time the Yeni, while the flow rate is estimated through the discharge line drops for a longer period of time, from the moment In time to D.

In figures 8A-B shows the operation of the pumping and sampling. In this case, the pumps 60, 62 are in mismatched synchronized mode from figures 7A-B. However, the operation of sampling can be carried out for any of these modes. These figures are similar to figures 7A-B, except that the figures V-5 selected camera 42 is attached in the evaluation of the soil line. For selective deflection of the fluid in the selected camera along outlet line shows the valves 66 and 68.

Preferably, the valves were operated and/or fluid was given in the selected camera at the time, when estimated in the drain line is clean fluid. In the mode shown in figures 8A-B, the sampling is carried out after the pump has made a loop to guarantee, to guarantee the flow into a clean fluid in the estimated discharge line 28. As shown in the figures V-3, the valve 66 is closed and the valve 68 is open in moments And With an operation time of pumping. As shown in figure V, at the time D time the valve 66 is open and the valve 68 is closed for starting the inflow of fluid into a sampling chamber 42. As shown in figure V, at the time E time, the fluid begins to flow into the selected cell.

p> In figures 8A-B shows a specific operation of the sampling used in combination with the mode of pumping. The operation of sampling can also be used in combination with other modes of pumping, such as those shown in figures 4-6. It is preferable to manage this pumping and sampling to extract a pure fluid in a selected camera and/or contaminated fluid to withdraw from her. For the detection of contamination of the fluid can be monitored throughout the drainage lines. When there is contamination of the fluid can be withdrawn from the selected camera, for example in the wellbore.

In addition, you can control the pressure drop in the lines, using other devices for raising and/or lowering the pressure in one or more branch lines. For example, the pistons in selected chambers and pistons preliminary tests can be allotted to extract fluid. To control the pressure in the branch lines can also be used for injection, valve control, hydrostatic pressure, and other technologies.

From the preceding description it should be clear that various modifications and changes may be made in the preferred and alternate embodiments of implementation of the present invention without deviation from its true nature. To perform the desired operation and the device, included in the invention, can operate manually and/or automatically. Actuation can be carried out on request and/or based on data detected conditions and/or results of analysis works well.

This description is intended for illustrative purposes only and should not be construed in a restrictive sense. Scope of this invention should be determined only by the letter of the claims which follows. The term "comprising" in the claims is supposed meaning "including at least", so the list of items described in the claims, is an open group. Indefinite articles and other terms of the form of the singular is assumed to be covering the plural form, if not done special exception.

1. The system of evaluation of aquifer parameters for a downhole tool located in a borehole traversing a subterranean formation having a primary fluid and a contaminated fluid containing at least two inlet device for receiving fluid from the reservoir, at least one estimated discharge line connected to the fluid with at least one inlet device for the passage of the primary fluid into the downhole tool, at least one clean the ing the discharge line, connected in fluid with at least one inlet device for the passage of contaminated fluid into the downhole tool; at least one fluid circuit, connected in fluid with at least one evaluative outlet line, at least one cleaning drain lines and their combinations for the selective extraction of fluid in it, at least one hydraulic connector to selectively create a hydraulic connection between the at least one estimated the drain line and at least one cleaning the drain line and at least one sensor for measuring downhole parameters in one of the at least one estimated outlet line, at one cleaning drain lines and their combinations.

2. The system of evaluation of parameters of layers according to claim 1, additionally containing a device for the movement of fluids, put forward from the housing for sealing engagement with the wall of the borehole and having at least two inlet fixture passing through it.

3. The system of evaluation of parameters of layers according to claim 1 or 2, in which at least one hydraulic connector configured to pass fluid from the area upstream of at least one estimated the drain line to the area downstream of at least one cleaning odwodnienie or transmission fluid from the area upstream of at least one cleaning the drain line to the area downstream of at least one selected drain lines and their combinations.

4. The system of evaluation of parameters of layers according to claim 1 or 2, in which at least one hydraulic connector attached to bypass lines at the location upstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

5. The system of evaluation of aquifer parameters according to claims 1, 2 or 3, in which at least one hydraulic connector attached to bypass lines at the location downstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

6. The system of evaluation of parameters of layers according to claim 1 or 2, additionally containing at least one balancing valve passing from one of the at least one estimated the drain line, at least one cleaning lines and combinations of them to join him on the fluid of the borehole.

7. The system of evaluation of parameters of layers according to claim 1 or 2, in which at least one fluid circuit includes at least one pump, at least one selected cell and at least one valve for selectively advancing fluid through the downhole tool.

8. The system of evaluation of parameters of layers according to claim 1 or 2, in which at least one sensor configured to measure fluid properties in at least od the Oh of the estimated bypass line, cleaning the drain line, and combinations of them.

9. The system of evaluation of parameters of layers according to claim 1 or 2, additionally containing at least one piston preliminary tests, functionally connected with one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

10. The system of evaluation of parameters of layers according to claim 1 or 2, additionally containing at least one isolation valve to allow selective flow of fluid through one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

11. The method of estimating the parameters of the subterranean formation having a primary fluid and a contaminated fluid, comprising the following operations:
location in the wellbore traversing a formation downhole tool having at least two inlet device, configured to extract fluid in at least one estimated gate line and at least one sewage treatment discharge line in the downhole tool;
selective extraction of fluids in one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations;
selective creation of a hydraulic connection between the less the th least one estimated the drain line and at least one cleaning the drain line;
measuring downhole parameters of fluids in one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

12. The method according to claim 11, further comprising passing the fluid through the fluid circuit.

13. The method according to item 12, in which the fluid pumped into the fluid circuit at least one pump.

14. The method according to claim 11, in which the operation of the electoral create a hydraulic connection contains one of the following operations: transmission fluid from the area upstream of at least one estimated the drain line to the area downstream of at least one cleaning the drain line, the transmission fluid from the area upstream of at least one cleaning the drain line to the area downstream of at least one appraisal outlet line, a combination of these operations.

15. The method according to claim 11, in which the operation of the electoral create a hydraulic connection includes the connection of drainage lines on site upstream from one of the shut-off valve appraisal bypass line shut-off valve cleaning drain lines and their combinations.

16. The method according to claim 11, in which the operation of the electoral create a hydraulic connection includes the connection of drainage lines on site downstream from one of the shut-off valve appraisal outlet is the turn, shut-off valve cleaning drain lines and their combinations.

17. The method according to claim 11, further comprising polling the creation of a flow of fluid between the wellbore and one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

18. The method according to claim 11, including additional analysis of the measured downhole parameters.

19. The method according to p, which compare the downhole parameters of drainage lines.

20. The method according to p, in which the measured downhole parameter is a pressure differential between at least estimated, and at least one cleaning the drain line.

21. The method according to claim 11, in which the downhole tool further comprises a set of paths of fluid connected to at least one of the branch lines, each fluid circuit has at least one pump, and operation of extraction contains selective injection of fluids into one of the at least one estimated the drain line, at least one cleaning drain lines and their combinations.

22. The method according to item 21, in which the pump to selectively actuate to prevent inflow of contaminated fluid in the estimated discharge line.

23. The method according to item 21, further comprising pumping fluid from the evaluation of the soil line at m is d one selected camera.



 

Same patents:

FIELD: oil and gas production.

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19 cl, 27 dwg

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38 cl, 8 dwg

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FIELD: oil and gas production.

SUBSTANCE: invention refers to oil producing industry and is designed for evaluating properties of reservoirs surrounding underground well. To achieve the object of the invention the method consists in recording time after completion of drilling at the depth interval, in determining permeability of reservoirs at the depth interval, in generating time cycling of pressure in a borehole of the well and in assessing periodic and un-periodic constituents of pressure measured in reservoirs at the depth interval. By time, periodic constituent and permeability there is determined coefficient of diffusion of pressure and water-permeability of reservoirs, also there is assessed area of zone of pressure build-up around the borehole of the well at the depth interval. Further, by time, coefficient of diffusion of pressure, water-permeability of reservoirs and un-periodic constituent there is determined an indicator of filtration of clay coating at the depth interval. By the indicator of filtration there is evaluated pressure gradient at the depth interval and extrapolation is carried out to determine reservoir pressure by pressure gradient and by area of zone of pressure build-up.

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21 cl, 15 dwg

Depth sampler // 2360109

FIELD: mining.

SUBSTANCE: depth sampler consists of ballast chamber, of actuator with module of control, of main and additional sample taking chambers equipped with medium-separating pistons, hydro-resistors and valve units. Each medium-separating piston is equipped with a compensating tube, which connects under-piston cavities of sampling chambers between them. Also hydro-resistor is assembled at the end of each tube.

EFFECT: simplification and upgraded efficiency of operation of units of device, decreased dimensions of sampler, improved quality of separation of taken samples, and validity of measured information.

1 dwg

FIELD: mining.

SUBSTANCE: method consists in boring vertical, horizontal or inclined borehole, in recovery of core samples from collector rock, in applying thermal analysis for identification of separate chemical compounds of collector, in determining connection of per cent concentrations of minerals with parametres of porosity and penetrability by using multi-dimensional correlation-regressive analysis and obtaining plural linear correlation equations for concrete oil and gas deposits facilitating calculation of porosity and penetrability on base of data on mineralogical composition of oil and gas deposits.

EFFECT: reduced labour intensiveness, and upgraded accuracy and validity of determination of mineralogical composition of core material.

1 ex, 2 tbl, 4 dwg

FIELD: oil and gas industry.

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86 cl, 9 dwg

FIELD: oil and gas extractive industry.

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EFFECT: higher reliability.

6 cl, 14 dwg

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