Device and method for controlling pressure of well fluid sample

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes picking a sample of bed fluid under pressure by means of pump. Sample of fluid is then compressed by moveable piston, actuated by hydrostatic pressure in well through valve. Compressed sample of bed fluid is contained under high pressure inside the chamber with fixed volume for delivery to well surface. Moveable piston is in form of inner and outer bushings, moveable relatively to each other. At the same time several tanks for picking samples from several areas may be lowered into well with minimal time delays. Tanks may be emptied on well surface by evacuation pressure, to constantly provide for keeping of pressure of fluid sample above previously selected pressure.

EFFECT: higher reliability.

6 cl, 14 dwg

 

The technical field to which the invention relates.

This invention relates to the drilling of the earth and sampling of formation fluids from the wellbore. More specifically, the invention relates to methods and devices for sampling formation fluids from deep wells and in situ composition of the sample (i.e. the corresponding reservoir conditions) after rising to the surface.

The level of technology

Reservoir fluids in the wells of hydrocarbon products are usually a mixture of oil, gas and water. Pressure, temperature and volume of reservoir fluids determine the phase relationship of these components. In deep formations of high pressure well fluid in the well often lead to the dissolution of gas in the oil at a pressure above the saturation pressure. After lowering the pressure of the mixed or dissolved mixture of gases separated from the liquid phase of the sample. Accurate measurement of pressure, temperature and composition of the formation fluid specific well is commercial interest from the point of view of possible production fluids from the well. These data also provide information that allows you to achieve maximum production and productivity of specific hydrocarbon deposits.

Some methods and devices to analyze downhole fluids directly into depth with the vazhiny. U.S. patent No. 5361839 issued to Griffith and others (1993), offers a Converter for generating the output characteristics of the sample fluid in the borehole depth. U.S. patent No. 5329811, issued to Schultz and others (1994), describes a device and method to determine (estimate) the pressure and volume of a sample of well fluid in the well depth.

Other methods and devices provide lift sample of well fluid from the well to the surface for subsequent studies. U.S. patent No. 4583595 issued dressing gowns and others (1986), offers a reciprocating mechanism for sampling well fluid. U.S. patent No. 4721157 issued Bertino (1988), offers a flexible valve sleeve for sampling well fluid into the chamber. U.S. patent No. 4766955 issued to Petermann (1988), offers the piston valve for sampling well fluid, and U.S. patent No. 4903765 issued to Sunkel (1990), offers a sampler of well fluid with a time delay. U.S. patent No. 5009100 issued to Gruber and others (1991), offers a rope sampler for sampling well fluid with the desired depth of the wellbore; U.S. patent No. 5240072, issued to Schultz and others (1993), offers the o-ring sampler, pressure-sensitive, for multiple sampling well fluid through the different time intervals and depth; U.S. patent No. 5322120 issued Bija other (1994), offers hydraulic system, driven by electricity, for multiple sampling of borehole fluid in the borehole depth.

The temperature in the lower part of the trunk of deep wells often exceeds 300 degrees F (~150°). When a hot sample of formation fluid is delivered to the surface, where the temperature is 70 degrees F (21° (C), the resulting drop in temperature leads to a compression of the sample of formation fluid. If the volume does not change, this compression greatly reduces the pressure of the sample. The pressure drop changes in situ parameters of the fluid corresponding to reservoir conditions, and can lead to phase separation of liquids and gases, rastvorennye in a sample of formation fluid. Phase separation significantly modifies the characteristics of the formation fluid and reduces the possibility of estimating the actual properties of the formation fluid.

To overcome these limitations have been developed various methods and devices to maintain constant the pressure of the sample of formation fluid. U.S. patent No. 5337822 issued by Massey and others (1994), offers compression samples of formation fluid through a hydraulic piston driven by compressed high-pressure gas. Similarly, U.S. patent No. 5662166 issued by Shammai (1997), proposes the use of compressed gas to compress the robe of formation fluids. U.S. patent No. 5303775 (1994) and 5377755 (1995)issued by Michaels and others, offer a reversible piston pump for raising the pressure in the sample formation fluid above the saturation pressure so that the subsequent cooling is not lowered fluid pressure below the saturation pressure.

Existing methods and devices for maintaining reservoir pressure at the sample is limited by many factors. Prestressed or compression springs are not suitable as the necessary compression efforts require exceptionally large springs. Shear (cutting) mechanisms are inflexible and do not allow to conduct multiple samples from different locations of the wellbore. Gas charges can be a cause of sudden (explosive) decompression seals and contamination of the sample. Gas system create a pre-pressure require complex systems, including tanks, valves and regulators, which are expensive, take up too much space in a tight space well and require maintenance and repair. Electric or hydraulic pumps require a control surface and have similar restrictions.

Thus, there is a need for an improved system that can compensate for the loss of hydrostatic pressure in the borehole so that the sample of formation fluid could bytepointer on the surface of the well when the pressure therein, as close as possible to Plast. The system must be reliable and able to take samples from different areas of the wellbore.

Summary of the invention

This invention provides a device and method for controlling pressure in a compressed sample of the downhole fluid, taken from the depth of the wellbore in the earth. The device includes a housing having a hollow inner portion. In the internal part of the body is a composite piston bounding a chamber for the sample fluid, the piston can move within the inside of the housing to selectively change the volume of the chamber for the sample fluid. Composite piston consists of an outer sleeve and inner sleeve, movable with respect to the outer sleeve. However, moving the inner sleeve relative to the outer is unidirectional. External pump extracts the reservoir fluid and delivers under pressure into the chamber for the sample fluid. Open position the valve allows the compressed well fluid to move above the piston to compress the sample fluid in the chamber for the sample fluid to the sample fluid remained compressed, when it is raised to the surface of the well.

The method of the invention is carried out in practice by lowering the casing into the wellbore. Composite piston moves in the chamber for sample formation fluid filed EXT is they pump. After filling of the chamber valve is opened to enter the wellbore fluid at hydrostatic pressure of the wellbore to the impact on the piston in order to move the specified piston to compress a sample of the downhole fluid in the chamber for fluid sampling. Due to the fact that the square of the piston are different, the force on the inner sleeve of the composite piston unbalanced, thereby providing compression of the sample fluid by reducing the volume. Reduced fixed mechanical position lock compound of the piston relative to the camera for samples.

Brief description of drawings

The advantages and further aspects of the invention will be easily appreciated by anyone having ordinary skill in the art, as they become more understandable from the following detailed description, taken together with the accompanying drawings, among which are;

figure 1 is a schematic cross-section of the earth illustrating the environment in which the invention works;

figure 2 is a diagram of the invention in the working Assembly in conjunction with operating auxiliary devices;

figure 3 is a diagram of the described system extraction and supply of formation fluid;

figure 4 is an isometric projection of store containers for samples;

figure 5 is an isometric projection of the present invention;

6 is savourest of the invention in isometric projection;

7 is a detailed section of the invention in place (the end) of the input samples;

Fig is a detailed section view of the Assembly according to the invention the section of the camera for samples;

figure 9 is a detailed section of the end of the composite piston according to the place of entrance of the hydrostatic pressure of the wellbore;

figure 10 is an axial section of the invention in isometric projection in obtaining samples of formation fluids;

11 is a detailed section of a composite piston being in the position that provides the entrance of well fluid;

Fig is a detailed section relative axial displacement of the elements of the composite piston;

Fig is an axial section of the invention in the course of extraction of the sample; and

Fig is an axial section of the invention in orthographic projection.

Description of the preferred variants of the invention

1 schematically shows the cross-section of the earth 10 along the wellbore 11. Usually bore at least partially filled with a mixture of liquids, including water, drilling mud and formation fluids that are natural to the earth formations through which the borehole. In the future, these mixtures of liquids will be referred to as “downhole fluids”. The term “formation fluid” will be used to denote a particular formation fluid, excluding luminometry mixture or contamination of fluids, initially (in nature) is not present in a particular formation.

Within the bore 11 at the lower end of cable 12 is suspended from the device 20 for sampling formation fluid. The cable 12 is typically passed through a pulley 13 mounted on the derrick 14. The unwinding and winding of the cable is performed using the winch, for example, serving on the truck 15.

In accordance with this invention, the preferred construction of the device 20 for collecting samples is schematically depicted in figure 2. Preferably, when such a device for collecting samples is consistent with the Assembly of several sections of the device connected end-to-end to each other by means of screw plugs sealing unit 23. Section Assembly device according to this invention may include block 21 the supply of hydraulic energy and extractor 22 of reservoir fluid. Below the extractor 22 is a block 24 of the motor/pump with a large displacement for a purge line. Below the pump with a large displacement of block is 25 similar motor/pump with a smaller working volume, which is exactly (quantitatively) is controlled, as described in more detail relative to Fig 3. Usually one or more sections 26 in the form of store tanks attached below the pump with a smaller displacement. Each section 26 in VI the e-shop may have three or more reservoir 30 for the sample fluid.

The extractor 22 formation fluid includes a retractable suction probe 27, in front of which are the lugs 28 in the wall of the borehole. And suction probe 27, and located opposite the lugs 28 are telescoped hydraulically for secure attachment to the walls of the borehole. The design and details of the operation device 22 of the extraction fluid are described in more detail in U.S. patent No. 5303775, the description of which is included here as a reference.

The operation of the device is provided by electricity supplied from a service truck 15 by cable 12 to the block 21 the supply of hydraulic energy. As can be seen from figure 3, the block 21 the supply of hydraulic energy is the motor 32 AC, resulting in the action of hydraulic piston pump 34. Hydraulic piston pump creates pressure in the closed hydraulic system 36. The hydraulic system is controlled by an actuated with a solenoid four-way valve 47, for example, to drive the motor portion 42 of the integrated unit 25 of the piston pump/motor. The pump part 44 of the block 25 of the pump/motor is controlled by the sensor 46 of the rod position, for example, to control the pumped volume. Formation fluid drawn in through the suction probe 27 is directed by valve 48 operated by a solenoid alternately in different cells naso is and 44 and further to the dispenser 49 tanks. In this way the volume of samples selected formation fluids are extracted directly from the right places formations and delivered to the designated camera samples among multiple devices 30 tanks for samples.

Intermediate sub-steps in the extraction process of formation fluids according to this invention uses a block 24 of the motor/pump with a large displacement of blowdown pipelines formation fluid between the suction probe 27 and the pump 25 with a small displacement. As these sub-phases do not require precise dosing, measurement of the volume flow of the pump is not required. In the rest of section 24 of the motor/pump can be the same as section 25 of the motor/pump, except the preferences that the pump section 24 has a large capacity working capacity.

Present section 26 in the form of store, depicted in figure 4, includes a cylinder 50 with the slots. It is desirable to manufacture the cylinder 50 for three or four tanks 30. Each tank 30 is quickly established in a niche 51 by a bayonet lock. Two or more cylinders 50 are connected through the sleeve 23 with an internal thread, which is fixed against axial movement to one end of one of the cylinders, but freely rotates about the axis of the cylinder. The hub 23 is wrapped around the outer threaded mating connecting beans the key 52 to provide a tight seal at the interface between them, therefore the channels 54 of the flow of liquid drilled in the end of each boss 52, permanently sealed around the connection.

Figure 5, 6 and 7 shows that each tank 30 includes a sealed cylindrical housing 60, which is bounded on opposite ends of the cylindrical inserts. In inserting the lower edge of the valve subassembly 62 having a mounting lug 63 and the conductive fluid nozzle 66, acting along its axis. The channel 68 in the nozzle 66 is selectively connected by the respective channel 54 with the valve 49 tanks and, ultimately, with suction probe 27 of the extractor 22 of reservoir fluid. The fluid flow in the channel 68 is rectified check valve 69. In the valve subassembly 62 includes a path 74 to the flow of formation fluid between the channel 68 and the reservoir formation fluid within the sealed enclosure 60. Controlled solenoid shut-off valve 76 mounted for selective opening and closing transmission channel path 74. As best seen in isometric detailed cross-section in figure 1, the exhaust valve 78 selectively closes the bypass channel 79 connected to the duct 74 for fluid flow.

Returning to the axial cross-section of figure 6, it is seen that the insertion of the upper end of the sealed enclosure includes a subassembly 64 channel 70 of the inlet fluid, which connects the inside of the deposits of the channel 80 of the sealed enclosure 60 with a threaded socket 72 for connection of a branch pipe, similar to the one used in tubing columns. The channel 70 is normally open to fluid flow between the internal channel 80 and borehole (in situ) environment. In the inner channel 80 sealed enclosure 60 is subassembly 82 rolling engagement, which includes a coaxial Assembly of the inner movable/lockable sleeve 86 with the outer movable sleeve 84, as shown in Fig. Locking the piston rod 90 is connected to the outer movable sleeve 84 locking bolt 88, as shown in Fig.9. The channel 92 of the fluid passing along the rod 90, directly connects the inner surface 96 of the free (floating) of the piston 94 with open wellbore channel 70. Free piston 94 is fixed against axial movement in the inner hole of the movable/lockable sleeve 86 retaining ring 98. The blending ball 99 is placed inside the receiving sample (reservoir fluid) chamber 95, which is geometrically defined as a variable volume bounded by the inner wall of the channel 80 of the sealed enclosure 60, the valve subassembly 62 and the end surface podborki 82 rolling grip.

Case retaining ring 100 having an internal annular teeth 102 and the outer ring teeth 104, selectively connects the rod 90 with internal rolling/locking sleeve 86. Selective connection of the toothed locking ring is 100 allows the sleeve 86 to move along the axis of the rod 90 from the piston 84, but prevents any reversal of this move.

Another construction detail of the inner movable/lockable sleeve 86 is sealed partition wall 122 between the opposite ends of the sleeve 86. The camera 124 formed between the partition 122 and the piston head 106 of the rod 90, pressurized, and the pressure it corresponds to the atmospheric pressure existing in the chamber during Assembly of the device.

Case retaining ring 100, located between the blocking piston rod 90 and the wall of the inner channel of the inner movable/lockable sleeve 86 above the partition 122, does not create obstacles to the distribution of pressure fluid. Consequently, the chamber 126 between the partition 122 and the housing retaining ring 100 operates at the same fluid pressure as the camera 120 filling the borehole fluid, when the valve 110 filling open.

Continuing to refer to figure 9, it is seen that the basis of the free piston/sleeve 84 includes a valve 110 filling with the pin 112, is pressed by a spring 114 to seal the valve seat 116. The pin has a pin 118 extending from the end plane of the free piston/sleeve 84. When the end plane of the free piston/sleeve 84 is pressed against the inner surface of the upper podborki 64 (11), the pin 112 extends from a connection with the sealing seat 116 and passes squag the config fluid in the chamber 120 filling, as shown in figure 11 and 12. The camera 120 filling geometrically defined as a variable amount, a limited annular space between the outer perimeter of the rod 90 and the inner channel 85 of the outer movable sleeve 84.

The principle of operation

Preparation of tanks for 30 samples before descending into the well includes closing the exhaust valve 78 and the opening of the shut-off valve 76. Using energy and running equipment installed on the technician truck 15, the device for sampling descends into the well to the desired location of sampling. After reaching the desired position of the block 21 the supply of hydraulic energy remotely involved with the maintenance of the truck 15. Hydraulic power from the unit 21 is sent to the block 22 of the extractor formation fluid to position the suction reservoir fluid probe 27 and the lugs 28 on the walls of the borehole. Suction probe 27 provides isolated, direct channel for the stream of essentially pure formation fluid. Such a flow of formation fluid into the suction probe 27 is initially caused by the suction of the pump 24 with a large working volume, which is driven by a block 21 of the supply of hydropower. The pump 24 large amount of work during a predefined period of time to ensure flushing of distribution channels from pollution is built well fluid reservoir fluid, retrieved suction probe 27. When predefined for flushing channel time interval ends, hydropower is switched from the pump 24 to the large volume to porshneva pump 25 small volume. Referring to figure 3, we see that the reservoir fluid is withdrawn from the suction probe 27 of the pump 25, is directed alternately to the four-way valve 48 in the opposite chamber 44. At the same time the valve 48 directs the head of chambers, for example, multi-pass rotary valve 49, which further directs the reservoir fluid to the desired tank 30 for samples.

Formation fluid flows into the reservoir 30 through the channel 68 of the nozzle and is directed through the check valve 69 and highway 74 flow in receiving a sample chamber 95. Shut-off valve 76 of the tank opening before the descent of the reservoir into the well. The pressure of the pumped formation fluid receiving a sample chamber 95 moves as an external sliding sleeve 84 and the inner movable/lockable sleeve 86 against the constant pressure of the well in the inner channel 80 sealed housing 60, as shown in figure 10. When the pressure of the sample of formation fluid in the chamber 95, the receiving samples of formation fluid reaches the discharge pressure of the pump 25, opposite the high pressure valve closes and locks the sample of formation fluid in the chamber 30 for samples prochoda 74.

Also, when receiving the sample chamber 95 is filled, the end plane of the outer movable sleeve 84 comes into contact with the inner surface of the upper podborki 64. In this regard, the rod 118 receives the axial displacement and opens the valve 110 filling. Internal channels in the outer movable sleeve 84 is sent downhole fluid in the chamber 120 is filled. The pressure of well fluid in the chamber 120 filling acts on the movable/lockable sleeve 84 on the area of the annular cross section of the chamber 120 of the content.

Against the force acting on the movable/lockable sleeve 86 with the side of the chamber filling, there are two sources of pressure. One source is the pressure of the formation fluid in the chamber 95 of the sample, acting on the annular cross section of the end face of the movable/lockable sleeve 86 and is caused by a block 25 of the pump a small volume. Another pressure opposing the pressure in the chamber filling, the pressure in the closed air chamber 124 acting on the annular surface of the septum 122.

Original power balance on the movable/lockable sleeve 86 allows the pressure chamber filling to push the annular end of the sleeve 86 into the chamber 95 for samples. As the liquid reservoir fluid is practically incompressible, the introduction of rigid ring structure of the sleeve 86 in chamber volume for samples exponentially increase icepay pressure in the chamber for samples until not yet achieved the ultimate balance of power. However, when the pressure of this medium moderate (measured) compression fluid can still be achieved.

This axial movement of the inner movable/lockable sleeve 86 with respect to the outer sleeve 84 is also passed porshneva the rod 90, which is attached to the outer sleeve 84 by means of the locking bolt 88. Therefore, the partition wall 122 of the sleeve 86 is moved toward porshneva bottom 106, compressing the gas atmosphere in the chamber 124, thereby adding additional stress to the power balance.

Due to internal and external circular prongs 102 and 104, corresponding vessel stoparea ring 100, the movement of the piston 90 relative to the inner movable sleeve 86 rectified (i.e. directed in one direction only) for fixing that surround the invasion of design 86 in chamber volume for samples.

After compression of the sample volume of formation fluid pressure in the sample fluid is considerably higher than the pressure in the well. Although this greatly increased in situ (in local terms) the pressure drops in a closed sample of fluid taken from wells, existing components can be designed so that after lifting the collected sample fluid from the well the pressure of the sample fell below the saturation pressure of the mixed or dissolved gas. Movement of the inner movable/lockable in ulki 86 produces a further compression of the sampled formation fluid above the maximum pressure of the pump 25. This compression continues until the desired ratio is reached.

For example, the sample fluid may have a hydrostatic pressure of the borehole 10,000 psi (about 69 MPa). Typical compressibility for such fluid is 5×10-6then there is a decrease in the volume of only eight percent will raise the pressure in the sample fluid at 16000 psi (~110 MPa) up to 26,000 pounds/square inch (~179 MPa), with a compression ratio of 2.6 to 1.0. When the section 26 in the form of store and collected sample of formation fluid will be raised to the surface of the borehole 11, the temperature of the sample formation fluid will decrease (cool), thereby returning the pressure of the sample of formation fluids to the original Plast pressure 10,000 psi (about 69 MPa). If the temperature of the fluid in the borehole is 270°F (~132° (C) and the temperature on the surface of the bore 11 is 70°F (~21°C), the resulting temperature drop at 200°F (111° (C) will reduce the pressure of the sample fluid at a constant volume of approximately 15300 lb/sq. inch (~105,5 MPa); therefore, the resulting pressure of the sample fluid on the surface will be approximately 10700 psi (~is 73.5 MPa).

To save the volume of the chamber 95 to sample fluid constant after pulling out of the shop 26 of the bore 11 of the inner movable/lockable sleeve 86 is fixed relative to the external is it movable sleeve 84 during removal of the magazine 26. In this invention, the fixation is performed by tank lock ring 100. This mechanism allows to increase the pressure on a sample of formation fluid in the chamber 95 to sample proportional to the local (in situ) the pressure in the well. For example, section 26 in the form of store can consistently fall in more depth in the borehole 11, where the hydrostatic pressure is greater than the previous sample. Hydrostatic pressure in the well is passed through the valve 110 filling in the camera 120 filling further movement of the inner movable/lockable sleeve 86 and further compression of the sample of formation fluid in the chamber 95 to sample up to more pressure. This increase in pressure can be performed quickly, and the store 26 is raised to the surface of the borehole 11, before a significant amount of heat due to the increased depth in the well, will be transferred to the pre-selected sample of formation fluid. On the surface of the bore 11 of the valve 76 of the tank close to capture samples of formation fluids. After that, the exhaust valve 78 may be opened to relieve the pressure of the fluid in the passage between the shut-off valve 76 of the tank and the check valve 69 high pressure. This pressure relief provides a positive indication of the pressure the fluid and facilitates the removal of the tank 30 from the magazine 26. Fig explains one technology to move or remove samples of reservoir fluid under pressure from the chamber 95 to the sample fluid. The tank 30 is connected with a source 130 of the pressure that is attached through a hole 132 in the upper subassembly 64. The pressure from the source 130 pressure increases until the pressure is equal to the product of the inverse of the ratio of the expected pressure inside the chamber 95 to the sample fluid. For sample pressure fluid 10000 psi (~69 MPa), extraction pressure should be:

1/2,6×10000=3850 pounds/square inch (~26.5 MPa)

After the reverse ratio is reached, the valve 76 opens sharply and sample formation fluid exits through the passage (or tract) 74 attached to the pipe receiver. Reverse the loading pressure can be increased to displace the sampled formation fluid up until the edge of the inner movable/lockable sleeve 86 will not rest against the valve subassembly 62. The continuing flow of extraction fluid from the source 130 pressure moves the external sliding sleeve 84 relative to the inner sleeve 86. Consequently, the piston plate 106 abuts against the free piston 94, forcing almost the entire sample of formation fluid from the chamber 95. Only the volume inside the chamber 95, do not remove extraction pressure, is located in the annular space is between the outer movable sleeve 84 and the valve subassembly 62. After that, the nodes of the reservoir 30 can be disassembled and installed in the initial position for the next use.

Summing up the above, the invention allows at the same time (i.e. in a single operation) to omit many of the tanks 30 to collect samples from different zones within the borehole 11. Each reservoir can be selectively used to collect various samples at different pressures and to compress each sample with different coefficients exceeding the saturation pressure of the gas contained in the sample. Operational costs are significantly reduced, because it takes less time to prepare when making sampling from multiple areas. The invention prevents the reduction of pressure in each sample of the fluid is below the saturation pressure, so each sample, raised to the surface of the well, has essentially the same pressure as at the time of sampling in the well. The invention performs this function without the use of expanding gases, large springs and complex mechanical systems. The sample fluid is collected under pressure and optionally compressed by the force derived from the hydrostatic pressure in the well.

Although the invention has been described on the example of some preferred variants of realization, for any specialist having ordinary skills in this on the region of the equipment, will be obvious that changes and improvements can be made in this invention without deviating from the essence of the invention as a whole. The embodiments shown here are simply to illustrate the concept of the invention and should not be interpreted as limiting the invention.

1. Device for controlling the pressure of the compressed sample of the downhole fluid selected from the depth of the well, comprising a housing having an internal cavity; a piston named inside of the body cavity to limit the camera for the sample fluid, and named piston movable within the named of the body cavity to selectively change the volume of the mentioned cameras for the sample fluid; a pump for supplying the sample fluid under pressure in the said chamber for the sample of fluid; and a valve allowing compressed well fluid to move the named piston, and called the movement of the piston compresses the sample fluid within named chamber for the sample fluid so that the sample fluid remains compressed when the sample fluid is moved to the surface of the well.

2. The device according to claim 1, characterized in that it also includes a check valve mounted between said pump and the said chamber for the sample fluid to prevent return named piston sample fluid to the said pump.

3. Device is about according to claim 1, characterized in that the said valve is attached to the said piston.

4. The device according to claim 1, characterized in that it also includes a shut-off valve tank located between said pump and the said chamber for the sample fluid to selectively isolate these cells for samples of fluid from the pressure above the pump.

5. The device according to claim 1, characterized in that it also includes a stopper for fixing the aforementioned piston relative to the named body to save the volume of the mentioned cameras for the sample fluid.

6. The device according to claim 1, characterized in that the said piston includes an outer sleeve and an inner sleeve movable relative to the named external sleeve, and named the valve is able to provide contact between the compressed downhole fluid and named inner sleeve to move the mentioned inner sleeve relative to the named external sleeve to compress the sample fluid.

7. The device according to claim 6, characterized in that it also includes a stopper for fixing the mentioned inner sleeve relative to the named external sleeve to save the volume of the mentioned cameras for the sample fluid.

8. The device according to claim 6, characterized in that it also includes the camera filling between said inner sleeve and called outer sleeve for receiving compressed what about the well fluid, so that the fluid causes the effect of differential pressure on the aforementioned internal bushing for shift called the inner sleeve relative to the named external sleeve.

9. The device according to claim 8, characterized in that it also includes the atmospheric chamber between said inner sleeve and called the outer sleeve, the pressure in which is initially below the hydrostatic pressure and which is reduced in volume when called inner sleeve moves relative to a named external sleeve.

10. The device according to claim 1, characterized in that it also includes a second piston associated with the named casing for limiting the second chamber for the sample fluid and connected to the above-mentioned pump and the said valve for selective compression of the sample of fluid pressure different from the pressure of the fluid inside the other chamber for the sample fluid.

11. Device for controlling the pressure of the compressed sample of the downhole fluid selected from the depth of the well, comprising a housing having an internal cavity; a piston named inside of the body cavity to limit the camera for the sample fluid, and named piston movable within the named of the body cavity to selectively change the volume of the mentioned cameras for the sample fluid, the piston includes an outer sleeve and an inner sleeve, and inside NAA sleeve movable relative to the named external sleeve; the pump for supplying the sample fluid under pressure in the said chamber for the sample fluid; a holding means which serves to hold the named external sleeve of the piston relative to the named casing; and a valve selectively allowing the compressed well fluid to move the mentioned inner sleeve of the piston relative to the named external sleeve of the piston, so called fluid is compressed within named chamber for the sample fluid.

12. The device according to claim 11, characterized in that it also includes a valve selectively blocking communication of fluid between said pump and the said chamber for the sample fluid.

13. The device according to item 12, characterized in that the aforementioned valve contains a check valve.

14. The device according to claim 11, characterized in that it also includes a retainer for retaining the mentioned inner sleeve piston fixed relative to the above case.

15. The method of controlling the pressure of the compressed sample of well fluid from a well, comprising the following steps:

lower the casing into the well, and called the housing has a piston inside the hollow inner part called the body, which is movable to restrict the camera to sample fluid;

pumped downhole fluid in the said chamber for the sample of fluid for sampling well fluid;

result in the operation of the valve to enter the wellbore fluid at hydrostatic pressure in the borehole in contact with the named piston to move above the piston, compressing a sample of well fluid within named chamber for the sample fluid;

keep a sample of the downhole fluid inside these cameras for the sample fluid at the time, named as the piston moves to compress a sample of well fluid within named chamber for the sample fluid;

fix named piston relative named casing for fixing a sample volume of well fluid within named chamber for the sample fluid after reaching the downhole fluid selected pressure which is higher than the hydrostatic pressure in the well; and

pull the named casing to the surface of the well.

16. The method according to item 15, characterized in that it also comprises a stage on which to extract a sample of the downhole fluid from these chambers for sample fluid while maintaining the pressure in the sample of well fluid above the selected pressure.

17. The method according to item 15, characterized in that it also comprises a stage on which move called the case to another zone within the wellbore after the named piston is locked relative to the named housing, and further includes the steps, which is filled with a second sample of the downhole fluid in the second chamber of the downhole fluid actuate named valve to move the second piston to compress the second sample fluorescence is IDA, and fix the mentioned piston relative to the named body for fixation of the second sample fluid.

18. The method according to 17, characterized in that the said second pressure compresses the second sample fluid to a pressure greater than the pressure of the other sample fluid.

19. The method according to item 15, characterized in that it also comprises a stage on which lowered named casing inside the well so that a greater hydrostatic pressure of the fluid propelled named piston to further compress the sample of well fluid before mentioned case raised on the surface of the well.

20. The method according to item 15, characterized in that the aforementioned piston compresses a sample of well fluid to the pressure at which the sample of well fluid does not change the phase relationship when called body lift on the surface of the well.

21. The method for transferring samples of formation fluids of the earth from the depth of the production well to the surface of the well, and named the method includes the following steps:

(a) omit a connected Assembly of downhole devices in a wellbore, and named the Assembly includes a device for extracting formation fluid, a reservoir for receiving the sample of formation fluid and controlled from the surface pump for selective filling of the reservoir fluid called tank to receive the deposits of the sample;

(b) positioning the named device extracting formation fluid at the first depth of the borehole;

(c) remove the reservoir fluid called on the first depth of the borehole;

(d) fill the first volume of the sample in said reservoir for receiving the sample in an appropriate volume of formation fluids from the first depth;

(e) make local (in situ) well pressure to the element named reservoir for receiving the sample in order to reduce the first volume of sample is called the first reservoir for receiving the sample to the second sample volume smaller than the first named volume of sample, without displacement of fluid from the above-mentioned reservoir for receiving the sample, resulting in the first volume of sample formation fluid from the first depth is compressed to a pressure substantially greater than the named local pressure in the borehole;

(f) structurally record called the second volume of the sample and

(g) raise the Assembly of downhole devices to the surface of the well.

22. The method according to item 21, characterized in that the aforementioned Assembly of the downhole device includes a second reservoir for receiving the sample, the method further includes the following steps:

(a) re-position the named device extracting formation fluid at the second depth of the hole before lifting named sat the RCTs downhole devices to the surface of the well;

(b) remove the reservoir fluid in the above second borehole depth;

(c) fill the first volume of the sample named second reservoir for receiving the sample of formation fluid from the second depth;

(d) make named second local well pressure to the element named second reservoir for receiving the sample in order to reduce the first volume of the sample to the second sample volume smaller than the first named volume of sample, without replacement of the fluid of the above-mentioned second reservoir for receiving the sample, resulting in the first volume of sample formation fluid from the second depth is compressed to a pressure substantially greater than named second local pressure in the borehole; and

(e) structurally fixed named second closed volume named second reservoir for receiving the sample.

23. The method according to item 21, wherein the called constructive detail of the mentioned reservoir for receiving the sample has a smaller effective area of the working pressure in the first closed volume than the effective area of the working pressure, which acts called the pressure in the well.

24. How to retrieve samples of formation fluids of the earth, comprising the following steps:

(a) prepare the reservoir for receiving the sample having the camera for samples with a variable volume is m;

(b) place called a reservoir for receiving the sample in the borehole;

(c) fill on site (in situ) the first volume of these cameras to sample the first volume of the formation fluid;

(d) apply local pressure in the well to constructive details of the mentioned reservoir for receiving the sample in order to reduce the mentioned chamber for sample to the second volume smaller than the first named amount, without displacement of fluid from these chambers to the sample, whereby the mentioned reservoir fluid is compressed up to the pressure, substantially larger than the named local pressure in the borehole;

(e) fix the position of the second volume of the mentioned structural details and

(f) remove the named vessel to obtain samples from these wells.

25. The method according to paragraph 24, characterized in that the structural part is a movable partition between the local borehole fluid and the formation fluid within the named camera to test.

26. The method according to paragraph 24, wherein the local pressure in the well attached to these structural details, moves the named item in the said chamber for the sample with the decrease of its volume.

27. The method according to p, characterized in that the aforementioned local borehole fluid acts on a larger area called the structural details than the reservoir fluid inside these cameras for testing.

28. Device for lifting samples of formation fluid earth borehole, comprising

(a) a cylinder, which has a movable piston for limiting chamber of variable volume for samples and named piston is movable relative to each other of the first and second elements, perceiving pressure, and each of these accept the pressure elements has a corresponding surface receiving the pressure in the chamber for the sample, and the surface receiving the pressure in the borehole and the surface receiving the pressure in the well, called second accept the pressure element is greater than the surface receiving the pressure in the chamber for the sample, called the second accept the pressure element;

(b) a pump for extracting fluid from the formation of the earth and to submit the mentioned fluid through a conductive channel in the said chamber for the sample;

(c) a first valve in the said conducting channel to prevent reverse flow of fluid from these chambers for sample;

(d) a second valve for passing well fluid to the surface receiving the pressure in the well, called second accept the pressure element and named the second valve is called on first perceiving the pressure element and is driven by the arrival named first accept the pressure element in position, corresponds to the maximum volume of the chamber for the sample.

29. The device according to p, characterized in that the said first and second receiving pressure elements include coaxially movable first and second coupling elements, respectively, and the second coupling element is movable inside the first coupling element.

30. The device according to clause 29, characterized in that the said first and second coupling elements contain a conjugate associated gear elements for limiting mutual relative movement between said coupling elements.

31. The device according to item 30, wherein the surface receiving the pressure in the well, called the first receiving pressure element includes, essentially, the whole surface of the piston across one end of the first named coupling element, and named valve is located inside the mentioned surface of the piston.

32. The device according to clause 29, characterized in that the aforementioned cylinder ends from opposite ends of the respective end walls, whereby the said chamber of variable volume for the sample expands when the offset of the named piston along the said cylinder to the first endwall.

33. The device according to p, characterized in that the said second valve is placed on n is called the first coupling element and open at the approach of the mentioned piston to the said first cylinder wall.

34. The device according to p, characterized in that the said second valve passes downhole fluid between said first and second coupling elements for axial movement called the second coupling element with respect to the first named coupling element.

35. The device according to 34, characterized in that the said first and second coupling elements include a rectifier joint movement, resulting in a movement called the second coupling element with respect to the first named coupling element is unidirectional.



 

Same patents:

Device for sampling // 2242607
The invention relates to the oil industry, in particular to devices for sampling of high pressure pipelines, and can be used to control the processes of production, preparation, transportation and storage of oil, oil products and gas, regardless of their rheological properties and the ambient temperature, providing high reliability

The invention relates to a chemical sensor for use in downhole fluid analysis

The invention relates to a drilling technique and can be used in powerful ice strata of mountain glaciers, for dissection and sampling of the subglacial water bodies, preventing their pollution

The invention relates to the study of reservoirs and can be used for measuring the pressure of the formation through which the wellbore

The invention relates to the oil and gas industry and is designed to overlap the axial channel tubing string of pipe below the packer and the insulation layer from the cavity tubes

The invention relates to the testing of wells and can be used for sampling liquids with dissolved gas

The invention relates to the testing of wells and can be used for sampling liquids with dissolved gas

The invention relates to a drilling technique and can be used for drilling in ice cover, for sampling related to the study of the nature of the subglacial water bodies, their origin and past of the composition of waters, and the possible existence of any life forms

The invention relates to the oil and gas industry and can be used, in particular, in the study of wells for sampling formation fluids

The sampler // 2171891
The invention relates to the oil and gas industry, specifically to a device for sampling liquids from pipelines

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes picking a sample of bed fluid under pressure by means of pump. Sample of fluid is then compressed by moveable piston, actuated by hydrostatic pressure in well through valve. Compressed sample of bed fluid is contained under high pressure inside the chamber with fixed volume for delivery to well surface. Moveable piston is in form of inner and outer bushings, moveable relatively to each other. At the same time several tanks for picking samples from several areas may be lowered into well with minimal time delays. Tanks may be emptied on well surface by evacuation pressure, to constantly provide for keeping of pressure of fluid sample above previously selected pressure.

EFFECT: higher reliability.

6 cl, 14 dwg

FIELD: oil industry.

SUBSTANCE: device has hollow body which is a fragment of force pipeline at vertically placed portion of mouth armature. Tool for controlling flow of multi-component gas-liquid substance is made in form of valve, connected to rotary support. Sample chamber is a ring-shaped hollow in hollow body, placed at same level with valve and connected at inlet to flow of multi-component gas-liquid substance through extracting channels, made on hollow body. Extracting channels are made in form of side slits, positioned symmetrically relatively to valve rotation axis. Ring-shaped hollow on hollow body is connected at outlet to locking tool, mounted at extension of valve shaft and made in form of sample-taking valve. Valve shaft and sample-taking valve are interconnected through hollow intermediate shaft. Sample-taking valve is placed in the body of locking tool with possible reciprocal movement. Valve shaft and hollow intermediate shaft are interconnected with possible mutual rotation for a quarter of one turn.

EFFECT: simplified construction and maintenance, higher quality.

4 dwg

FIELD: oil and gas industry.

SUBSTANCE: device has body in form of calibrated cylinder. From both sides lids are connected to body. Inside the body separating piston and ball for mixing sample are placed. Also provided is hydraulic resistance for slow inlet of sample. Slide valve is used for safe inletting, pressurization and depressurization of taken fluid, is connected to lid and consists of rod with channels and bushing with clamp. Clamp is held between nuts interconnected by threads, one of which is connected to rod by thread. Needle valve consists of locking pin and axle-bearing and is used to drain pressure from closed space above slide valve prior to disconnection of sample-taking container from bed-testing equipment.

EFFECT: simplified construction, higher reliability.

3 dwg

FIELD: oil industry.

SUBSTANCE: device has hollow body mounted in force pipeline, inside of which body tool for controlling flow of multi-component gas-liquid substance is placed, probing chamber with extracting channels, locking tool with handle and guiding pipe, driving valve for picking sample, mounted with possible interaction with spring-loaded rod, placed inside the shaft of flow control tool. Hollow body is a fragment of force pipeline at vertical portion of mouth armature, control tool is made in form of valve of lesser diameter, then inner diameter of hollow body, and probing chamber is a ring-shaped hollow in hollow body, positioned at same level with valve and connected at input to flow of multi-component gas-liquid substance through extraction channels, made symmetrically to rotation axis of valve, and at output - to locking tool, while rod is provided with shelves for multi-start thread of appropriate cross-section, made at shaft on length of no less than quarter of axial step of this thread.

EFFECT: simplified construction, higher efficiency.

3 dwg

FIELD: oil industry.

SUBSTANCE: device has hollow cylindrical body, branch pipes for extraction and output of sample and locking element. Body is made thick-walled. End portions of body are made in form of truncated cone and interconnected, on the side of lesser bases by means of channel. Branch pipe for extraction of sample is made elongated, with length equal to body diameter, and is let through in transverse direction of body through the center of said channel. Within limits of branch pipe cross-section its hollow is separated by slanted solid wall on two portions, each of which is connected thereto. One portion of branch pipe hollow is meant for taking sample, other one - for feeding reagent into well product. To receive trustworthy information about sample, by setting flow to homogenous state, inner surface of cone, on the side of larger base, is provided with rigidly fixed blades for turbulization of flow flowing into body, while diameter of channel connecting cones is selected equal to diameters of their lesser bases.

EFFECT: simplified construction, broader functional capabilities, higher quality of sample.

2 cl, 3 dwg

FIELD: oil industry.

SUBSTANCE: hollow body of device is actually a fragment of force pipeline at mostly vertical portion of mouth armature. Organ for controlling flow of multi-component gas-liquid substance is made in form of valve mounted on shaft having lesser size, than inner diameter of hollow body. Sample chamber is in form of ring-shaped hollow on hollow body, positioned at same level with valve. Ring-shaped hollow is connected at input to flow of multi-component gas-liquid substance through intake channels, positioned symmetrically to valve rotation axis, and at output - with locking organ. Driving screw mounted on body of locking organ is connected to sample-taking valve with possible mutual rotation and combined axial displacement. Sample-taking valve and shaft with valve are mated with possible synchronous rotation around common axis and relative axial displacement. Working organs of device are positioned immediately near main flow of substance taken as sample to provide for lesser dimensions of device and prevented freezing in winter season.

EFFECT: simplified construction, simplified maintenance.

7 dwg

FIELD: oil production industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: device comprises inflatable packers to be lowered into well along with flow string. One flow string end is closed to provide simultaneous well bore packing, another end is connected to production equipment. Flow string is provided with centralizers located near inflatable packers. Formed in flow string are additional holes located opposite to packers. Well pump is installed inside flow string. High-pressure water conduit having low diameter is connected to above holes. Flow string has perforated orifices created between inflatable packers.

EFFECT: extended operational capabilities.

1 dwg

Sampler // 2257471

FIELD: oil-field equipment, particularly for obtaining fluid samples or testing fluids in boreholes or wells and may be used for integrated obtaining sample of multicomponent liquid-gas systems transported through pipelines.

SUBSTANCE: sampler comprises hollow body installed in high-pressure pipeline of wellhead fittings and extraction chamber with discharge channels. Rotary tool adapted for multicomponent liquid-gas medium flow regulation is installed inside the body. Sampler also has shutoff member with actuated sample extracting valve, handle and guiding tube. Sampler comprises hollow body made as a part of high-pressure pipeline and tool adapted for multicomponent liquid-gas medium flow regulation arranged in hollow body. The tool consists of flap installed on a shaft and having diameter corresponding to inner hollow body diameter, extraction chamber used to extract and mix multicomponent liquid-gas medium flow formed as annular cavity around hollow body. The cavity is divided into inlet and outlet parts by partition arranged at flap level. Inlet and outlet parts communicate with common multicomponent liquid-gas medium flow correspondingly through inlet and outlet channels on hollow body and through opening formed in the partition at sample extracting valve inlet. Drive screw installed in shutoff member body is connected with sample extracting valve so that drive screw and sample extracting valve may perform mutual rotation and move in axial direction. Sample extracting valve and shaft with flap mate each other so that they may perform synchronous limited rotation about common axis and mutual axial movement.

EFFECT: increased simplicity, provision of high-quality mixing of sample product and increased sample reliability.

3 dwg

Sampling device // 2258807

FIELD: oil field equipment, particularly for take samples from wellhead, namely for integrated sampling multi-component gas-liquid medium transported through pipelines.

SUBSTANCE: device has hollow body built in pressure pipeline and formed as a part of the pipeline located on vertical part of wellhead fittings. Multi-component gas-liquid medium flow control unit is made as a gate connected to rotary support shaft. Sampling chamber is created as annular cavity arranged on hollow body at gate level. Sampling chamber inlet is communicated with multi-component gas-liquid medium flow through intake manifolds formed on hollow body. Intake manifolds are side slots arranged symmetrically about gate axis of rotation. Sampling chamber outlet is communicated with shutoff member installed on rotary gate support shaft extension. Shutoff member includes seat, hold-down screw and ball contacting with the seat and embedded in pressure screw end.

EFFECT: simplified structure and increased sampling quality.

2 dwg

FIELD: mining industry, particularly to take subsurface oil samples in running and exploratory wells working in flow mode.

SUBSTANCE: sampling device has tubular body with lock mechanism arranged inside the body and connected to controlling valve assembly from the first side and controllable valve assembly from the second side thereof. Joint relay is screwed on the controlling valve assembly. The controlling assembly is retained in its opened position by joint relay including body with orifices for pin receiving, pusher acting upon the controlling valve assembly and bush with fluid circulation orifices. Valve assemblies include all-rubber valves having 30° cone angles. The relay has barbs to engage with production string connector. When sampling device moves downwards the barbs are brought into folded state.

EFFECT: increased operational reliability and prevention of oil sample degassing due to improved air-tightness of sampling device interior.

2 cl, 1 dwg

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