A pressure measuring device and a pressure measuring method

Abstract

The application discloses a pressure measuring device and a pressure measuring method, and solves the technical problem that the pressure measuring device is difficult to extract a precise volume of a formation sample and has poor test accuracy. The device comprises an electric control joint, a power suction joint and a setting and pushing joint. The power suction joint comprises a power outer cylinder, a hydraulic mechanism, a suction cavity, a suction piston, a power screw and a motor assembly. The hydraulic mechanism is arranged in the power outer cylinder and is used for controlling the setting and pushing joint to be opened or retracted. The suction cavity is arranged in the power outer cylinder. The suction piston is vertically and slidably arranged in the suction cavity. The power screw is vertically and rotationally connected to the power outer cylinder. The motor assembly is arranged in the power outer cylinder and is used for controlling the power screw to rotate. The transmission part is vertically and slidably connected to the power outer cylinder. One end of the transmission part is threadedly sleeved on the power screw, and the other end penetrates into the suction cavity and is fixedly connected with the suction piston. The application can extract a precise volume of a formation sample, improve the test accuracy and improve the test efficiency.

Description

Technical Field

[0001] This invention belongs to the field of oil well pressure measurement technology, specifically relating to a pressure measurement device and a pressure measurement method. Background Technology

[0002] In oil exploration, measuring formation pressure using formation testing equipment is crucial for assessing the exploitability of oil and gas in the formation. Formation pressure measurements can effectively predict reservoir production, delineate the oil-water interface, and analyze and calculate information such as formation permeability and reservoir effectiveness.

[0003] The pressure measuring device in related technologies typically includes a control sub, a hydraulic sub, and a setting and pushing sub. When pressure measurement is required, the control sub controls the hydraulic sub to extend the setting probe and pushing arm on the setting and pushing sub. Then, the hydraulic sub controls the movement of the piston inside it so that the setting probe can draw a certain amount of liquid from the formation, thereby realizing the formation pressure test.

[0004] However, the piston inside the hydraulic short section is controlled by hydraulic pressure, that is, by the supply and return of hydraulic oil. Since the supply and return of hydraulic oil are difficult to control precisely, the accuracy of the piston's movement distance is relatively poor. As a result, the pressure measuring device has difficulty extracting formation samples of precise volume, thus affecting the accuracy of the test, which needs to be improved. Summary of the Invention

[0005] In order to solve all or some of the above problems, the purpose of this invention is to provide a pressure measuring device and a pressure measuring method that can extract formation samples of precise volume, improve testing accuracy, and improve testing efficiency.

[0006] In a first aspect, the present invention provides a pressure measuring device, comprising, from top to bottom, an electrically controlled short section, a power suction short section, and a setting and pushing short section, wherein the power suction short section comprises:

[0007] The power outer cylinder serves as a support and load-bearing element;

[0008] A hydraulic mechanism is installed inside the power cylinder and is used to control the opening or retraction of the seated push-back section;

[0009] The suction chamber is located inside the power outer cylinder, and the suction chamber is connected to the seated push-off section via a fluid pipe.

[0010] The suction piston is vertically slidably disposed within the suction chamber;

[0011] The power lead screw is vertically rotatably connected inside the power outer cylinder;

[0012] A motor assembly is disposed inside the power outer cylinder and is used to control the rotation of the power lead screw;

[0013] The transmission unit is vertically and slidably connected inside the power outer cylinder;

[0014] One end of the transmission unit is threaded onto the power screw, and the other end passes into the suction chamber and is fixedly connected to the suction piston.

[0015] Optionally, the seated push-back section includes:

[0016] The outer cylinder is supported and coaxially connected to the bottom of the power outer cylinder;

[0017] The push arm is telescopically mounted on the outer support cylinder;

[0018] A setting probe is telescopically mounted on the supporting outer cylinder;

[0019] The setting probe is connected to the suction chamber via a fluid pipe, and the hydraulic mechanism is used to control the extension and retraction of the push arm and the setting probe.

[0020] Optionally, the setting and pushing section further includes a quartz sensor disposed on the supporting outer cylinder, the quartz sensor being connected to the fluid conduit and used to monitor the temperature and pressure of the sample liquid.

[0021] Optionally, the hydraulic mechanism includes:

[0022] A plunger pump is installed inside the power outer cylinder;

[0023] A hydraulic chamber is disposed inside the power outer cylinder, and the hydraulic chamber is located above the suction chamber;

[0024] A hydraulic piston is vertically slidably disposed within the hydraulic chamber;

[0025] The hydraulic piston is fixedly connected to the transmission unit. The plunger pump and the hydraulic chamber are respectively connected to the push arm and the setting probe through oil pipelines. When the hydraulic piston and the suction piston move downward and the suction chamber is emptied, the hydraulic piston can pressurize the hydraulic oil in the lower part of the hydraulic chamber, so that the plunger pump and the hydraulic chamber can jointly supply high-pressure hydraulic oil to the push arm and the setting probe, thereby controlling the rapid extension and retraction of the push arm and the setting probe.

[0026] Optionally, the hydraulic mechanism further includes:

[0027] Two solenoid valves are provided, each connected to an oil line pipe on the hydraulic chamber.

[0028] When the hydraulic oil in the push arm and the setting probe reaches the preset pressure, one of the solenoid valves controls the oil supply channel on the oil circuit to close, and the other solenoid valve controls the oil return channel on the oil circuit to open, so that the hydraulic oil discharged from the hydraulic chamber can return.

[0029] Optionally, the transmission unit includes:

[0030] A rotating nut is threaded onto the power screw, and a guide key is fixedly connected to the rotating nut. The inner wall of the power outer cylinder is provided with a guide groove that slides vertically with the guide key.

[0031] A transmission sleeve is fitted onto the power lead screw and fixedly connected to the rotating nut. The transmission sleeve passes through the hydraulic chamber and is fixedly connected to the hydraulic piston.

[0032] The transmission rod has one end inserted into the hydraulic chamber and fixedly connected to the hydraulic piston, and the other end inserted into the suction chamber and fixedly connected to the suction piston.

[0033] Optionally, the motor assembly includes:

[0034] A resolver motor is fixed inside the power outer cylinder;

[0035] The speed reducer is fixed inside the power cylinder;

[0036] The input shaft of the reducer is coaxially and fixedly connected to the input shaft of the resolver motor, and the output shaft of the reducer is coaxially and fixedly connected to the power lead screw.

[0037] Optionally, the bottom of the supporting outer cylinder is connected to an energy storage section, which is used to control the retraction of the push arm and the setting probe.

[0038] Optionally, the bottom of the energy storage sub is connected to a pressure balancing sub to balance the pressure of the pressure measuring device and the downhole pressure.

[0039] Secondly, the present invention provides a pressure measurement method using a pressure measuring device, comprising the following steps:

[0040] S1, through the electronically controlled short section and the power suction short section, controls the setting and pushing short section to open and form a setting seal with the well wall;

[0041] S2, through the power suction sub and the setting and pushing sub, suctions formation liquid samples to achieve pressure measurement.

[0042] S3, control the retraction of the set-top push-back short section and pull the pressure testing device out of the well to complete the pressure testing operation.

[0043] As can be seen from the above technical solutions, the pressure measuring device and method provided by the present invention have the following advantages:

[0044] This device uses a power screw to control the transmission unit, which drives the suction piston. Because the thread pitch of the power screw is constant, the stroke distance of the power screw can be precisely controlled by adjusting the number of rotations of the motor assembly. This allows for precise control of the suction piston's movement distance, enabling the pressure testing device to accurately extract a specified number of fluid formation samples, improving testing accuracy. Simultaneously, the plunger pump and hydraulic chamber supply high-pressure hydraulic oil to the push arm and setting probe, causing them to rapidly extend and retract. This allows the pressure testing device to quickly set and release from the wellbore, improving testing efficiency. Furthermore, the push arm and setting probe can retract quickly, increasing the release force and ensuring smooth release of the pressure testing device.

[0045] Other features and advantages of the present invention will be set forth in the following description. Attached Figure Description

[0046] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0047] Figure 1 This is a schematic diagram of the overall structure of the pressure measuring device in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the pressure measuring device in an embodiment of the present invention;

[0049] Figure 3 This is a cross-sectional view of the power suction subsection in an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the energy storage subsection in an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the pressure balancing subsection in an embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Electrical control sub; 101. Ground control module; 102. Transmission cable; 103. Bridle; 104. Tension gamma module; 105. Electronic communication module; 2. Power suction sub; 201. Power outer cylinder; 202. Hydraulic mechanism; 203. Suction chamber; 204. Suction piston; 205. Power lead screw; 206. Motor assembly; 207. Transmission unit; 208. Piston pump; 209. Hydraulic chamber; 210. Hydraulic piston; 211. Solenoid valve; 212. Rotary... 213. Rotary nut; 214. Guide key; 215. Guide groove; 216. Transmission sleeve; 217. Transmission rod; 218. Resolver motor; 219. Reducer; 301. Setting and pushing sub; 302. Support outer cylinder; 303. Pushing arm; 304. Setting probe; 305. Quartz sensor; 4. Fluid outlet; 501. Energy storage sub; 502. Base; 503. Energy storage device; 601. Pressure balancing sub; 602. Pressure balancing outer cylinder; 603. Pressure piston; 604. Compression spring. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be arbitrarily combined with each other.

[0055] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 The figure shown is an embodiment of the present invention. This embodiment discloses a pressure measuring device, which includes an electrically controlled short section 1, a power suction short section 2, and a setting and pushing short section 3 connected in sequence from top to bottom. The setting and pushing short section 3 includes a vertically arranged support outer cylinder 301. A pushing arm 302 and a setting probe 303 are telescopically arranged on the support outer cylinder 301, and the pushing arm 302 and the setting probe 303 are symmetrically distributed on both sides of the support outer cylinder 301.

[0056] In one embodiment, such as Figure 1 , Figure 3 As shown, the power suction section 2 includes a vertically arranged power outer cylinder 201. The top end of the power outer cylinder 201 is connected to the electric control section 1, and the bottom end is connected to the support outer cylinder 301. At the same time, a hydraulic mechanism 202 is provided inside the power outer cylinder 201, and the hydraulic mechanism 202 is used to control the extension and retraction of the push arm 302 and the setting probe 303.

[0057] In one embodiment, such as Figure 1 , Figure 3As shown, a suction chamber 203 is integrally formed inside the power outer cylinder 201. A suction piston 204 is vertically slidably connected inside the suction chamber 203. The setting probe 303 is connected to the suction chamber 203 through a fluid pipe. When the suction piston 204 moves vertically upward, the setting probe 303 can extract the formation fluid sample and allow the fluid sample to enter the suction chamber 203.

[0058] In one embodiment, such as Figure 1 , Figure 3 As shown, a power screw 205 is vertically installed inside the power outer cylinder 201, and the power screw 205 and the power outer cylinder 201 are rotatably connected via bearings. A motor assembly 206 is fixedly connected inside the power outer cylinder 201, and the motor assembly 206 is used to control the rotation of the power screw 205. At the same time, a transmission part 207 is vertically slidably connected inside the power outer cylinder 201. One end of the transmission part 207 is threaded onto the power screw 205, and the other end passes into the suction chamber 203 and is fixedly connected to the suction piston 204.

[0059] In one embodiment, such as Figure 1 , Figure 2 As shown, a quartz sensor 304 is supported on the outer cylinder 301. The quartz sensor 304 is connected to the fluid pipeline and is used to monitor the temperature and pressure of the sample liquid.

[0060] The motor assembly 206 controls the rotation of the lead screw 205, which in turn drives the transmission unit 207 to move the extraction piston downwards, causing the suction chamber 203 to be emptied. Subsequently, the motor assembly 206 controls the lead screw 205 to rotate in the opposite direction, which then drives the transmission unit 207 to move the extraction piston upwards. At this time, a negative pressure is formed within the setting probe 303, thereby extracting the formation fluid sample and allowing it to enter the suction chamber 203, thus achieving pressure testing.

[0061] In this embodiment, the pressure measuring device controls the transmission unit 207 to drive the suction piston 204 through the power screw 205. Since the thread pitch of the power screw 205 is constant, the stroke distance of the power screw 205 can be precisely controlled by controlling the number of rotations of the motor assembly 206, thereby achieving precise control of the movement distance of the suction piston 204. This enables the pressure measuring device to accurately extract a specified number of fluid formation samples, improving the accuracy of the test.

[0062] In one embodiment, such as Figure 1 , Figure 3 As shown, the hydraulic mechanism 202 includes a piston pump 208 fixedly connected inside the power cylinder 201. The power cylinder 201 is equipped with a micro hydraulic station or oil tank and other storage mechanisms to realize the storage, supply and recovery of hydraulic oil.

[0063] In one embodiment, such as Figure 1 , Figure 3 As shown, a hydraulic chamber 209 is integrally formed inside the power outer cylinder 201. The hydraulic chamber 209 is located above the suction chamber 203, and a hydraulic piston 210 is vertically slidably connected inside the hydraulic chamber 209. At the same time, the hydraulic piston 210 is fixedly connected to the transmission part 207 so that the transmission part 207 can drive the hydraulic piston 210 to move.

[0064] In one embodiment, such as Figure 1 , Figure 3 As shown, the plunger pump 208 and the hydraulic chamber 209 are connected to the push arm 302 and the setting probe 303 respectively via oil lines, and the oil lines are connected to the storage mechanism. When the hydraulic piston 210 and the suction piston 204 move downwards, causing the suction chamber 203 to be emptied, the hydraulic piston 210 can pressurize the hydraulic oil in the lower part of the hydraulic chamber 209. At this time, the plunger pump 208 and the hydraulic chamber 209 can jointly supply high-pressure hydraulic oil to the push arm 302 and the setting probe 303, thereby controlling the rapid extension and retraction of the push arm 302 and the setting probe 303.

[0065] High-pressure hydraulic oil is supplied to the push arm 302 and the setting probe 303 by the plunger pump 208 and the hydraulic chamber 209, causing the push arm 302 and the setting probe 303 to extend and retract rapidly. This allows the pressure testing device to quickly set and release from the wellbore, improving testing efficiency. Furthermore, the push arm 302 and the setting probe 303 can retract quickly, increasing the release force and ensuring the pressure testing device can be successfully released.

[0066] In one embodiment, such as Figure 1 , Figure 3 As shown, the hydraulic mechanism 202 also includes two solenoid valves 211 respectively installed in the power outer cylinder 201, and the two solenoid valves 211 are respectively connected to the oil pipeline on the hydraulic chamber 209. That is, one solenoid valve 211 is installed on the oil supply channel of the oil pipeline, and the other solenoid valve 211 is installed on the oil return channel of the oil pipeline.

[0067] When the hydraulic oil in the push arm 302 and the setting probe 303 reaches the preset pressure, the solenoid valve 211 on the oil supply channel is closed to maintain the oil pressure in the push arm 302 and the setting probe 303. At the same time, the solenoid valve 211 on the return oil channel is opened. At this time, the hydraulic oil squeezed by the hydraulic piston 210 in the hydraulic chamber 209 enters the return oil channel and flows back to the storage mechanism. That is, after the push arm 302 and the setting probe 303 are pressed against the well wall, with the reciprocating motion of the hydraulic piston 210 and the suction piston 204, the hydraulic oil in the hydraulic chamber 209 will not supply oil to the push arm 302 and the setting probe 303, so as to reduce the risk of the push arm 302 and the setting probe 303 pressing too hard against the well wall. Furthermore, due to the small flow rate of the plunger pump 208, the plunger pump 208 continuously supplies oil to the push arm 302 and the setting probe 303 to ensure the oil pressure of the hydraulic oil in the push arm 302 and the setting probe 303, thereby improving the connection stability between the push arm 302 and the setting probe 303 and the well wall.

[0068] In one embodiment, such as Figure 2 , Figure 3 As shown, the power outer cylinder 201 is equipped with a fluid outlet 4, which is connected to the suction chamber 203 via a discharge pipe, allowing the formation fluid drawn by the setting probe 303 to be discharged through the discharge pipe. Furthermore, when the suction port of the setting probe 303 is blocked by mud cake, a reverse discharge command can be executed, that is, mud is drawn in from the fluid outlet 4 and allowed to enter the setting probe 303 to dislodge the mud cake blocking the suction port, ensuring the pressure measuring device can operate normally.

[0069] In one embodiment, such as Figure 1 , Figure 3 As shown, the transmission unit 207 includes a rotating nut 212 threaded onto the power screw 205. A guide key 213 is fixedly connected to the rotating nut 212. A guide groove 214 is provided on the inner wall of the power outer cylinder 201. The guide key 213 is vertically slidably engaged with the guide key 213 to ensure that the rotating nut 212 can slide vertically.

[0070] In one embodiment, such as Figure 1 , Figure 3 As shown, a transmission sleeve 215 is fitted onto the power lead screw 205. The transmission sleeve 215 is fixedly connected to the rotating nut 212, and the end of the transmission sleeve 215 away from the rotating nut 212 passes through the hydraulic cavity 209 and is fixedly connected to the hydraulic piston 210. At the same time, a transmission rod 216 is vertically arranged inside the power outer cylinder 201. One end of the transmission rod 216 passes through the hydraulic cavity 209 and is fixedly connected to the hydraulic piston 210, and the other end passes through the suction cavity 203 and is fixedly connected to the suction piston 204.

[0071] In one embodiment, such as Figure 1 , Figure 3 As shown, the motor assembly 206 includes a resolver motor 217 fixedly connected inside the power outer cylinder 201, and the resolver motor 217 has a self-locking mechanism, that is, when the resolver motor 217 is turned off, the output shaft of the resolver motor 217 is locked. At the same time, a reducer 218 is fixedly connected inside the power outer cylinder 201. The input shaft of the reducer 218 is coaxially fixedly connected to the input shaft of the resolver motor 217, and the output shaft of the reducer 218 is coaxially fixedly connected to the power lead screw 205, so as to realize the adjustment of the output torque of the resolver motor 217.

[0072] The resolver motor 217 is started, and the reducer controls the rotation of the power screw 205. At this time, the rotating nut 212 drives the transmission sleeve 215, hydraulic piston 210, transmission rod 216, and suction piston 204 to move downwards synchronously, so that the push arm 302 and the setting probe 303 extend synchronously, and the suction chamber 203 is emptied synchronously. This design allows the extension operation of the push arm 302 and the setting probe 303 and the emptying operation of the suction chamber 203 to be performed synchronously, thereby improving testing efficiency. Moreover, this design allows the hydraulic piston 210 and the suction piston 204 to share a single drive source, which not only improves the linkage effect of each component, but also improves resource utilization efficiency.

[0073] In one embodiment, such as Figure 1 , Figure 4 As shown, the bottom of the outer cylinder 301 is connected to an energy storage section 5. The energy storage section 5 is used to control the emergency retraction of the push arm 302 and the setting probe 303 so that when the power suction section 2 cannot control the push arm 302 and the setting probe 303 to unblock smoothly, the energy storage section 5 can ensure that the push arm 302 and the setting probe 303 can unblock smoothly.

[0074] In one embodiment, such as Figure 1 , Figure 4 As shown, the energy storage section 5 includes a base 501 fixed to the bottom of the supporting outer cylinder 301. Multiple sets of energy storage devices 502 are disposed on the base 501, and these sets are evenly spaced along the circumference of the base 501. In this embodiment, there are three sets of energy storage devices 502, each set spaced 120° apart, thereby maximizing the use of the space in the base 501.

[0075] In one embodiment, such as Figure 1 , Figure 4As shown, one end of the disc spring on the inner piston of accumulator 502 is connected to the return oil line, and the other end is connected to the push arm 302 and the setting probe 303, with a normally open solenoid valve in between. When the push arm 302 and the setting probe 303 are engaged, the accumulator 502 is charged. When the push arm 302 and the setting probe 303 retract, and the system pressure reaches the overflow pressure of 3300 psi, the accumulator 502 is fully charged. When the push arm 302 and the setting probe 303 extend, the solenoid valve opens, and the energy of the accumulator 502 is maintained at 3300 psi. In the event of a sudden power outage due to system failure, the solenoid valve is de-energized. At this time, the accumulator 502 is connected to the push arm 302 and the setting probe 303, allowing the setting probe 303 and the double push arms 302 to retract automatically, preventing the instrument from getting stuck downhole.

[0076] In one embodiment, such as Figure 1 , Figure 5 As shown, the bottom of the energy storage section 5 is connected to a pressure balancing section 6. The pressure balancing section 6 includes a pressure balancing outer cylinder 601. A pressure piston 602 and a compression spring 603 are vertically slidably connected inside the pressure balancing outer cylinder 601. The compression spring 603 is used to push the pressure piston 602 downward. At the same time, the pressure balancing outer cylinder 601 is connected to the hydraulic oil pipeline in the pressure measuring device, and the pressure balancing outer cylinder 601 is also connected to components such as the energy storage section 5 and the setting and pushing section 3.

[0077] During the process of lowering the pressure measuring device downhole, the pressure piston 602 moves upward under the action of downhole pressure, pressurizing the hydraulic oil, energy storage sub 5, and setting and pushing sub 3, so that the pressure measuring device can maintain a balance with the downhole pressure. On the one hand, this ensures the stable operation of each component, and on the other hand, it reduces the risk of the pushing arm 302, setting probe 303, and seals on the hydraulic lines falling off, thereby ensuring that the pressure measuring device can be lowered into a deeper well and can operate stably.

[0078] By placing the pressure balancing sub-section 6 at the bottom of the pressure measuring device, it is not necessary to pass transmission lines and other lines through the pressure balancing sub-section 6, thereby increasing the cross-section of the pressure balancing outer cylinder 601, which increases the volume of the oil chamber, effectively shortening the overall length of the pressure balancing sub-section 6, and thus shortening the overall length of the pressure measuring device.

[0079] In one embodiment, such as Figure 1 , Figure 2As shown, the electrical control section 1 includes, from top to bottom, a ground control module 101, a transmission cable 102, a bridle 103, a tension gamma module 104, and an electronic communication module 105, connected sequentially. The ground control unit primarily provides voltage to the instrument, sends commands, and monitors the instrument's status. The bridle effectively connects the transmission cable 102 to the various components of the pressure measuring instrument. The tension gamma module 104 primarily monitors the cable tension and the insertion depth of the pressure measuring device, thereby obtaining the device's position and whether it has encountered any obstruction. The electronic communication module 105 receives command signals from the ground control unit and converts these signals into different electrical signals, sending them to the various actuators of the pressure measuring device (such as the resolver motor 217, solenoid valve 211, etc.). Simultaneously, the electronic communication module 105 can also demodulate some data collected by the pressure measuring device and send it to the ground control unit, primarily serving the function of information transmission.

[0080] As described above, the device controls the transmission unit 207 to drive the suction piston 204 through the power screw 205. Since the thread pitch of the power screw 205 is constant, the stroke distance of the power screw 205 can be precisely controlled by controlling the number of rotations of the motor assembly 206, thereby achieving precise control of the movement distance of the suction piston 204. This enables the pressure measuring device to accurately extract a specified number of fluid formation samples, improving the accuracy of the test.

[0081] Simultaneously, the plunger pump 208 and the hydraulic chamber 209 jointly supply high-pressure hydraulic oil to the push arm 302 and the setting probe 303, enabling the push arm 302 and the setting probe 303 to rapidly extend and retract, allowing the pressure testing device to quickly set and release from the wellbore, thus improving testing efficiency. Furthermore, the push arm 302 and the setting probe 303 can quickly retract, increasing the release force and ensuring the pressure testing device can successfully release from the wellbore.

[0082] Furthermore, the hydraulic piston 210 and the suction piston 204 can move synchronously, allowing the extension of the push arm 302 and the setting probe 303, as well as the emptying of the suction chamber 203, to occur simultaneously, thereby improving testing efficiency. Moreover, this design allows the hydraulic piston 210 and the suction piston 204 to share a single drive source, improving both the linkage effect of the components and the efficiency of resource utilization.

[0083] This embodiment also discloses a pressure measurement method using the aforementioned pressure measurement device, comprising the following steps:

[0084] S1, an indication signal is sent through the electronic control sub 1, and the resolver motor 217 is activated. At this time, the hydraulic piston 210 and the suction piston 204 move downward synchronously, so that the setting probe 303 and the push arm 302 extend and press against the well wall. At the same time, the suction chamber 203 performs evacuation operation.

[0085] S2, an indication signal is sent through the electronic control section 1, and the resolver motor 217 is reversed so that the hydraulic piston 210 and the suction piston 204 move upward synchronously. At this time, a negative pressure is formed in the setting probe 303 and the formation fluid sample is extracted, and the formation liquid sample is brought into the suction chamber 203. At the same time, the sensor performs a pressure test on the formation liquid sample, thereby realizing the pressure measurement operation.

[0086] S3, by sending an indication signal through the electronic control sub 1, the setting probe 303 and the push arm 302 are retracted, and then the pressure measuring device is pulled out of the well to complete the pressure measuring operation.

[0087] The specific implementation process is as follows: After the instrument is lowered to a certain depth, the quartz sensor detects the mud pressure A at the current depth. If the formation pressure is to be detected at this depth, the voltage of the resolver motor is first set to 450V and the speed to 3000r / min, so that the plunger pump and the hydraulic chamber simultaneously input high-pressure hydraulic oil into the main pressure pipeline.

[0088] When the system pressure reaches 3300 psi (which is the overflow value of the relief valve on the main system pressure line branch), the setting probe and push arm are fully extended, and the resolver motor stops. At this time, check the pressure of the quartz sensor. If the pressure is still A, the setting was unsuccessful; if it is greater than or less than A, the setting was successful.

[0089] After successful setting, close the solenoid valves on the push arm and setting probe lines, then open the solenoid valves on the two lines connecting the two chambers of the hydraulic piston to connect them to the return oil line. Set the speed and revolutions of the resolver motor, and start the resolver motor. At this time, only the plunger pump outputs a small amount of pressurized oil.

[0090] When a certain amount of formation fluid is extracted, the pressure curve measured by the quartz sensor gradually decreases. After the resolver motor stops, the pressure gradually increases, reaching a certain value B (if it is A, it indicates a leak during the extraction process) and then stabilizing. Immediately afterwards, another extraction is performed. If the pressure curve stabilizes at value B, it indicates that the formation pressure at this point and depth is B. Subsequently, the push arm and setting probe retract, completing the pressure measurement at this location.

[0091] It should be noted that, unless otherwise stated, the technical or scientific terms used in this invention should have the ordinary meaning as understood by one of ordinary skill in the art.

[0092] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure measuring device, comprising, from top to bottom, an electrically controlled short section (1), a power suction short section (2), and a setting and pushing short section (3), characterized in that, The power suction sub (2) includes: The power outer cylinder (201) serves as a support and load-bearing element; A hydraulic mechanism (202) is provided inside the power outer cylinder (201) and is used to control the opening or retraction of the seated push-back section (3); The suction chamber (203) is located inside the power outer cylinder (201), and the suction chamber (203) is connected to the seated push-off section (3) through a fluid pipe; The suction piston (204) is vertically slidably disposed within the suction chamber (203); The power lead screw (205) is vertically rotatably connected inside the power outer cylinder (201); The motor assembly (206) is disposed inside the power outer cylinder (201) and is used to control the rotation of the power lead screw (205); The transmission unit (207) is vertically slidably connected inside the power outer cylinder (201); One end of the transmission part (207) is threaded onto the power screw (205), and the other end passes into the suction chamber (203) and is fixedly connected to the suction piston (204); The seated push-back short section (3) includes: The outer cylinder (301) is supported and coaxially connected to the bottom of the power outer cylinder (201); The push arm (302) is telescopically mounted on the supporting outer cylinder (301); The setting probe (303) is telescopically mounted on the supporting outer cylinder (301); The setting probe (303) is connected to the suction chamber (203) via a fluid pipe, and the hydraulic mechanism (202) is used to control the extension and retraction of the push arm (302) and the setting probe (303). The hydraulic mechanism (202) includes: A plunger pump (208) is disposed inside the power outer cylinder (201); A hydraulic chamber (209) is disposed inside the power outer cylinder (201), and the hydraulic chamber (209) is located above the suction chamber (203); A hydraulic piston (210) is vertically slidably disposed within the hydraulic chamber (209); The hydraulic piston (210) is fixedly connected to the transmission unit (207). The plunger pump (208) and the hydraulic chamber (209) are respectively connected to the push arm (302) and the setting probe (303) through oil pipes. When the hydraulic piston (210) and the suction piston (204) move downward and the suction chamber (203) is emptied, the hydraulic piston (210) can pressurize the hydraulic oil in the lower part of the hydraulic chamber (209) so that the plunger pump (208) and the hydraulic chamber (209) can supply high-pressure hydraulic oil to the push arm (302) and the setting probe (303) together, thereby controlling the rapid extension and retraction of the push arm (302) and the setting probe (303).

2. The pressure measuring device according to claim 1, characterized in that, The seated push-back section (3) also includes a quartz sensor (304) disposed on the supporting outer cylinder (301), the quartz sensor (304) being connected to the fluid pipeline and used to monitor the temperature and pressure of the sample liquid.

3. The pressure measuring device according to claim 1, characterized in that, The hydraulic mechanism (202) further includes: There are two solenoid valves (211), each connected to an oil line on the hydraulic chamber (209); When the hydraulic oil in the push arm (302) and the setting probe (303) reaches the preset pressure, one of the solenoid valves (211) controls the oil supply channel on the oil pipeline to close, and the other solenoid valve (211) controls the oil return channel on the oil pipeline to open, so that the hydraulic oil discharged from the hydraulic chamber (209) can return.

4. The pressure measuring device according to claim 1, characterized in that, The transmission unit (207) includes: A rotating nut (212) is threaded onto the power screw (205). A guide key (213) is fixedly connected to the rotating nut (212). A guide groove (214) is provided on the inner wall of the power outer cylinder (201) to slide vertically with the guide key (213). A transmission sleeve (215) is sleeved on the power screw (205) and fixedly connected to the rotating nut (212). The transmission sleeve (215) passes through the hydraulic chamber (209) and is fixedly connected to the hydraulic piston (210). The transmission rod (216) has one end inserted into the hydraulic chamber (209) and fixedly connected to the hydraulic piston (210), and the other end inserted into the suction chamber (203) and fixedly connected to the suction piston (204).

5. The pressure measuring device according to claim 1, characterized in that, The motor assembly (206) includes: A resolver motor (217) is fixed inside the power outer cylinder (201); The reducer (218) is fixed inside the power outer cylinder (201); The input shaft of the reducer (218) is coaxially and fixedly connected to the input shaft of the resolver motor (217), and the output shaft of the reducer (218) is coaxially and fixedly connected to the power lead screw (205).

6. The pressure measuring device according to claim 1, characterized in that, The bottom of the supporting outer cylinder (301) is connected to an energy storage section (5), which is used to control the retraction of the push arm (302) and the setting probe (303).

7. The pressure measuring device according to claim 6, characterized in that, The bottom of the energy storage section (5) is connected to a pressure balancing section (6) to balance the pressure measurement device and the downhole pressure.

8. A pressure measurement method, using the pressure measurement device according to any one of claims 1-7, characterized in that, Includes the following steps: S1, through the electronically controlled short section (1) and the power suction short section (2), the setting and pushing short section (3) is opened and set with the well wall; S2, by using the power suction sub (2) and the setting and pushing sub (3) to suction the formation liquid sample, thereby realizing the pressure measurement operation; S3, control the retraction of the seated push-back short section (3) and pull the pressure measuring device out of the well to complete the pressure measuring operation.

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