CN113216940B - Multi-point rock stratum pore pressure testing method and system - Google Patents
Multi-point rock stratum pore pressure testing method and system Download PDFInfo
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- CN113216940B CN113216940B CN202110459872.4A CN202110459872A CN113216940B CN 113216940 B CN113216940 B CN 113216940B CN 202110459872 A CN202110459872 A CN 202110459872A CN 113216940 B CN113216940 B CN 113216940B
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- 239000011148 porous material Substances 0.000 title claims abstract description 114
- 239000011435 rock Substances 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 title claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 128
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 60
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 238000002347 injection Methods 0.000 claims description 112
- 239000007924 injection Substances 0.000 claims description 112
- 238000005259 measurement Methods 0.000 claims description 43
- 230000007246 mechanism Effects 0.000 claims description 22
- 238000000034 method Methods 0.000 abstract description 36
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a multipoint position rock stratum pore pressure testing method and system. And then sealing the hole to be detected through the hydraulic expansion hole sealing plug to obtain a sealed space. And finally, after the sealed space is injected with gas, obtaining the pressure value of the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be detected according to the pressure value of the sealed space. This embodiment is through drilling on the stratum to put into the hole with water pressure inflation sealing plug, carry out the sealed back to this hole through water pressure inflation sealing plug, obtain actual stratum pore pressure value through measuring the pressure value in this hole. The method solves the problem that the formation pore pressure calculated by the traditional prediction method possibly has larger deviation with the actual formation pore pressure in the prior art.
Description
Technical Field
The invention relates to the field of rock stratum pore pressure measurement, in particular to a multi-point rock stratum pore pressure testing method and system.
Background
The existence of abnormal stratum pore pressure not only brings many difficulties to petroleum exploration, well drilling and development, but also poses potential threats to safe well drilling. Therefore, measurement of formation pore pressure is important in oil exploration. The current logging information, especially the formation acoustic velocity closely related to the formation pore pressure, is ideal information for determining the formation pore pressure. Conventional methods for predicting formation pore pressure using well log data include sonic wave time difference method, conductivity method, etc. The methods generally establish a normal trend line, qualitatively judge whether abnormal formation pore pressure exists according to whether a logging curve deviates from the normal trend line, if the logging curve deviates from the normal trend line obviously, the formation pore pressure with abnormal high pressure/low pressure is considered to exist, and then quantitatively calculate the formation pore pressure by an empirical coefficient method or other methods. Although the traditional prediction method improves the safety and reliability of drilling, the stratum structure is more and more complex with the improvement of the drilling depth and difficulty, and the stratum pore pressure calculated by the traditional prediction method may have larger deviation from the actual stratum pore pressure.
Thus, there is still a need for improvement and development of the prior art.
Disclosure of Invention
The present invention provides a method and a system for testing a multi-point rock formation pore pressure, which aim to solve the problem that the calculated formation pore pressure by the conventional prediction method may have a large deviation from the actual formation pore pressure in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows:
in a first aspect, an embodiment of the present invention provides a multi-point formation pore pressure testing method, where the method includes:
acquiring measurement position information, and generating a hole to be measured on a rock stratum to be measured according to the measurement position information;
sealing the hole to be detected through a hydraulic expansion hole sealing plug to obtain a sealed space;
and after the sealed space is injected with gas, obtaining the pressure value of the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be detected according to the pressure value of the sealed space.
In one embodiment, the obtaining measurement location information and generating a hole to be measured on a rock formation to be measured according to the measurement location information includes:
acquiring a preset depth value of a test position and an outer diameter value of the hydraulic expansion hole sealing plug;
determining measurement position information according to the depth value of the test position and the outer diameter value of the hydraulic expansion hole sealing plug;
and drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
In one embodiment, the hydraulic expansion hole sealing plug is a plurality of hydraulic expansion hole sealing plugs which are sequentially connected through a water injection pipe; the hole stopper seals the hole to be detected through hydraulic expansion, and a sealed space is obtained, and the method comprises the following steps:
sequentially moving the plurality of water pressure expansion hole sealing plugs to the hole to be detected through the water injection pipe;
the hole to be detected is sealed through the water injection pipe and the plurality of hydraulic expansion hole sealing plugs;
and taking a space formed between two adjacent hydraulic expansion sealing plugs and the hole wall of the hole to be measured in the plurality of hydraulic expansion sealing plugs as the sealing space.
In one embodiment, the sealing the hole to be tested by the water injection pipe and the plurality of hydraulically expanded hole sealing plugs comprises:
and injecting water into the plurality of water pressure expansion hole sealing plugs through the water injection pipe until a pressure value generated between the water pressure expansion hole sealing plug and the hole wall of the hole to be detected reaches a preset pressure threshold value, so as to seal the hole to be detected.
In one embodiment, two adjacent hydraulically expanded plugs of the plurality of hydraulically expanded plugs are connected by a gas injection screen; after the sealed space is injected with gas, obtaining a pressure value of the sealed space, and determining a rock stratum pore pressure value corresponding to the rock stratum to be tested according to the pressure value of the sealed space, including:
injecting gas into the sealed space according to the gas injection sieve tube until a preset gas injection duration is reached;
and after gas injection is finished, acquiring the air pressure value of the sealed space at preset time intervals, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be detected.
In a second aspect, an embodiment of the present invention further provides a multi-point formation pore pressure testing system, where the system includes:
the drilling mechanism is used for acquiring measurement position information and generating a hole to be measured on a rock stratum to be measured according to the measurement position information;
the sealing mechanism is used for controlling the hydraulic expansion hole sealing plug to seal the hole to be detected to obtain a sealed space;
and the testing mechanism is used for acquiring the pressure value of the sealed space after injecting gas into the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be tested according to the pressure value of the sealed space.
In one embodiment, the drilling mechanism comprises:
the parameter acquisition device is used for acquiring a preset depth value of the test position and an outer diameter value of the hydraulic expansion hole sealing plug;
the size calculation device is used for determining measurement position information according to the depth value of the test position and the outer diameter numerical value of the hydraulic expansion hole sealing plug;
and the drilling machine is used for drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
In one embodiment, the hydraulically expanding plugs are a plurality of hydraulically expanding plugs; the closure mechanism includes: the water injection pipe and the plurality of hydraulic expansion hole sealing plugs are arranged on the water injection pipe;
the water injection pipe is used for sequentially connecting the plurality of hydraulic expansion hole sealing plugs and sequentially moving the plurality of hydraulic expansion hole sealing plugs into the hole to be detected;
the hydraulic expansion hole sealing plug is used for sealing the hole to be detected together with the water injection pipe to obtain a sealed space; the sealed space is a space formed between two adjacent hydraulic expansion sealing hole plugs and the hole wall of the hole to be measured in the plurality of hydraulic expansion sealing hole plugs.
In one embodiment, the closure mechanism further comprises:
and the water injection control device is used for controlling the water injection pipe to inject water into the plurality of water pressure expansion hole sealing plugs until a pressure value generated between the water pressure expansion hole sealing plug and the hole wall of the hole to be detected reaches a preset pressure threshold value so as to seal the hole to be detected.
In one embodiment, the testing mechanism comprises:
the gas injection pipe is used for connecting two adjacent hydraulic expansion hole sealing plugs in the plurality of hydraulic expansion hole sealing plugs;
the gas injection control device is used for controlling the gas injection pipe to inject gas into the sealed space until a preset gas injection time length is reached;
and the air pressure measuring device is used for acquiring the air pressure value of the sealed space at preset time intervals after the air injection is finished, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be measured.
The invention has the beneficial effects that: according to the embodiment of the invention, the rock stratum is drilled, the hydraulic expansion hole sealing plug is placed in the hole, the hole is sealed through the hydraulic expansion hole sealing plug, and the actual rock stratum pore pressure value is obtained by measuring the pressure value in the hole. The method solves the problem that the formation pore pressure calculated by the traditional prediction method possibly has larger deviation with the actual formation pore pressure in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a multi-point formation pore pressure testing method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the internal structure of two adjacent hydraulically-expanded hole plugs provided by the embodiment of the invention.
Fig. 3 is a schematic diagram of the operation of placing a plurality of hydraulic expansion hole sealing plugs in the hole to be measured according to the embodiment of the present invention.
Fig. 4 is a block diagram of a hydraulically expanded plug according to an embodiment of the present invention.
FIG. 5 is an end view of sets of hydraulically expanded plugs provided by embodiments of the present invention.
FIG. 6 is a graph illustrating typical formation pore pressure results from a multi-site formation pore pressure test method provided by embodiments of the present invention.
Fig. 7 is a schematic diagram of an internal mechanism of a multi-point formation pore pressure testing system according to an embodiment of the present invention.
The reference numbers illustrate:
1: a water injection pipe; 2: hydraulically expanding the hole sealing plug; 3: a gas injection pipe; 4: a gas injection sieve tube; 5: a source of pressurized water; 6: a water shutoff valve; 7: a water pressure gauge; 8: a pressurized gas source; 9: an air shutoff valve; 10: a barometer; 11: sealing the space; 12: a water injection port; 13: and a gas injection port.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
The existence of abnormal stratum pore pressure not only brings many difficulties to petroleum exploration, well drilling and development, but also poses potential threats to safe well drilling. Therefore, measurement of formation pore pressure is important in oil exploration. The current logging information, especially the formation acoustic velocity closely related to the formation pore pressure, is ideal information for determining the formation pore pressure. Conventional methods for predicting formation pore pressure using well log data include sonic wave time difference method, conductivity method, etc. The methods generally establish a normal trend line, qualitatively judge whether abnormal formation pore pressure exists according to whether a logging curve deviates from the normal trend line, if the logging curve deviates from the normal trend line obviously, the formation pore pressure with abnormal high pressure/low pressure is considered to exist, and then quantitatively calculate the formation pore pressure by an empirical coefficient method or other methods. Although the traditional prediction method improves the safety and reliability of drilling, the stratum structure is more and more complex with the improvement of the drilling depth and difficulty, and the stratum pore pressure calculated by the traditional prediction method may have larger deviation from the actual stratum pore pressure.
Aiming at the defects in the prior art, the invention provides a multi-point position rock stratum pore pressure testing method, which is characterized in that a hole to be tested is generated on a rock stratum to be tested according to measurement position information by acquiring the measurement position information. And then sealing the hole to be detected through the hydraulic expansion hole sealing plug to obtain a sealed space. And finally, after the sealed space is injected with gas, obtaining the pressure value of the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be detected according to the pressure value of the sealed space. This embodiment is through drilling on the stratum to put into the hole with water pressure inflation sealing plug, carry out the sealed back to this hole through water pressure inflation sealing plug, obtain actual stratum pore pressure value through measuring the pressure value in this hole. The method solves the problem that the formation pore pressure calculated by the traditional prediction method possibly has larger deviation with the actual formation pore pressure in the prior art.
As shown in fig. 1, the method comprises the steps of:
and S100, obtaining measurement position information, and generating a hole to be measured on a rock stratum to be measured according to the measurement position information.
Specifically, in this embodiment, the formation position of the formation pore pressure value that needs to be measured at this time needs to be determined according to different measurement tasks, so as to obtain the measurement position information. And then drilling on the rock stratum to be measured according to the determined measurement position information to obtain the hole to be measured.
In one implementation, the step S100 specifically includes the following steps:
s101, acquiring a preset depth value of a test position and an outer diameter value of the hydraulic expansion sealing plug;
step S102, determining measurement position information according to the depth value of the test position and the outer diameter numerical value of the hydraulic expansion hole sealing plug;
and S103, drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
Specifically, the formation pore pressure refers to the pressure of fluid in the formation pores or fractures, and it can be understood that as the depth of the formation increases, the formation pore pressures corresponding to different depths of the formation also change correspondingly, so that it is first required to determine the formation pore pressure at a position at which the depth of the formation is to be measured according to a measurement task, and obtain a depth value of the test position. Furthermore, since the present embodiment requires collecting the actual pore pressure value of the rock formation, the present embodiment requires placing a hydraulic expansion plugging plug for sealing and gas injection inside the rock formation. In order to smoothly place the hydraulic expansion plug inside the formation, the present embodiment also needs to obtain the outer diameter of the hydraulic expansion plug. And then, according to the obtained depth value of the test position and the outer diameter of the hydraulic expansion hole sealing plug, the punching depth and the punching size can be respectively determined, and the hole to be tested can be obtained by punching according to the determined punching depth and the punching size.
In order to achieve the measurement of the actual pore pressure value of the formation, as shown in fig. 1, the method further comprises the steps of:
and S200, sealing the hole to be detected through a hydraulic expansion hole sealing plug to obtain a sealed space.
Specifically, because after drilling, the air of external environment can be gushed in the to-be-measured hole, therefore the atmospheric pressure in the to-be-measured hole also can receive the influence of external environment's atmospheric pressure, in order to measure the actual pore pressure value of stratum accurately, the hole of treating to survey is sealed at first to this embodiment to avoid the external air to cause the influence to the actual pore pressure value of measuring.
In one implementation, the step S200 specifically includes the following steps:
step S201, sequentially moving the plurality of water pressure expansion hole sealing plugs to the hole to be detected through the water injection pipe;
step S202, sealing the hole to be detected through the water injection pipe and the plurality of water pressure expansion hole sealing plugs;
step S203, taking a space formed between two adjacent hydraulic expansion sealing hole plugs and the hole wall of the hole to be measured in the plurality of hydraulic expansion sealing hole plugs as the sealing space.
Specifically, as shown in fig. 3, in this embodiment, a plurality of hydraulic expansion plugs are connected in sequence through a water injection pipe in advance. And as shown in fig. 5, a plurality of water pressure expansion sealing plugs are sequentially placed from the orifice of the hole to be measured to the bottom of the hole, each water pressure expansion sealing plug is provided with a water injection port, all the water injection ports are communicated through the same water injection pipe, and water is injected into each water pressure expansion sealing plug through the water injection pipe. One end of the water injection pipe is connected with a water pressure expansion hole sealing plug, and the other end of the water injection pipe is connected with a pressure water source. In one implementation, the water injection pipe can be a high-pressure water injection pipe, and a water pressure gauge can be further arranged on the water injection pipe to monitor the water pressure condition in the water injection pipe in real time. In the in-service use process, when the water stop valve is closed state, when the pressure water source is open state, water will flow into each water pressure expansion hole sealing stopper in proper order through the water injection pipe, each water pressure expansion hole sealing stopper will expand after being injected with water, and then treat the pore wall of survey hole and produce certain pressure, the pressure value that produces between the pore wall of each water pressure expansion hole sealing stopper and the hole that awaits measuring reaches preset pressure threshold value, it compresses tightly the pore wall of the hole that awaits surveying to show each water pressure expansion hole sealing stopper, realized treating the sealed of survey hole, then just need not to continue to each water pressure expansion hole sealing stopper water injection this moment again, can close the pressure water source.
In an implementation manner, the embodiment may also adopt other manners to expand the water pressure expansion hole sealing plug, so as to further seal the hole to be measured. For example, in this embodiment, the hole sealing plug may be expanded by air pressure, and the hole to be detected may be sealed by inflating the hole sealing plug by air pressure.
After the sealing of the hole to be measured is completed, in order to measure the actual pore pressure value of the rock formation, as shown in fig. 1, the method further includes the following steps:
step S300, after the sealed space is injected with gas, obtaining a pressure value of the sealed space, and determining a rock stratum pore pressure value corresponding to the rock stratum to be detected according to the pressure value of the sealed space.
Specifically, in order to determine the value of the pore pressure of the rock stratum, in this embodiment, gas needs to be injected into the sealed space formed between the hydraulic expansion plug and the rock wall, so that the gas injected into the sealed space is dissipated to the pore of the rock stratum, and when the pressure between the sealed space and the pore of the rock stratum is balanced, that is, when no pressure difference exists between the sealed space and the pore of the rock stratum, the gas pressure in the sealed space is measured, so that the value of the pore pressure of the rock stratum can be indirectly obtained.
In one implementation, a method of injecting water into the sealed space may also be adopted, so that the liquid injected into the sealed space is dissipated to the pores of the rock stratum, and after the pressure between the sealed space and the pores of the rock stratum is balanced, the pore pressure value of the rock stratum is obtained.
In order to inject gas into the sealed space, in one implementation, two adjacent hydraulically expanded plugs of the plurality of hydraulically expanded plugs are connected by a gas injection screen, and the step S300 specifically includes the following steps:
s301, injecting gas into the sealed space according to the gas injection sieve tube until a preset gas injection duration is reached;
step S302, after the gas injection is finished, obtaining the air pressure value of the sealed space at intervals of preset time length, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be measured.
Specifically, as shown in fig. 2 or 3, the sealed space in the present embodiment refers to a space formed between two adjacent hydraulic expansion plugs and the rock wall. In order to realize gas injection in the sealed space, in the embodiment, a gas injection sieve tube is arranged between any two adjacent hydraulic expansion hole sealing plugs in advance, the two adjacent hydraulic expansion hole sealing plugs are connected through the gas injection sieve tube, and gas injection is realized in the sealed space formed between the two adjacent hydraulic expansion hole sealing plugs and the rock wall. In one implementation, the gas injection screen is coupled to a gas injection pipe. The gas injection pipe is provided with a barometer and is connected with a high-pressure gas source, when gas is required to be injected into the sealed space, the high-pressure gas source is opened, the gas stop valve is closed, and then gas can flow into different gas injection sieve pipes through the gas injection pipe respectively and can be injected into different sealed spaces through the gas injection sieve pipes respectively.
Specifically, since any two adjacent hydraulic expansion hole sealing plugs generate a sealed space with the rock wall, the number of the sealed spaces is reduced by 1 from the number of the hydraulic expansion hole sealing plugs put into the hole to be measured, and in order to inject gas into each sealed space, as shown in fig. 4, a plurality of gas injection pipes need to be arranged on the hydraulic expansion hole sealing plugs in this embodiment. Specifically, as shown in fig. 5, each hydraulic expansion closing plug is further provided with a plurality of gas injection ports with different numbers, each gas injection port is connected with one gas injection screen pipe, and all the gas injection screen pipes are connected with the same gas injection pipe. In the practical use process, the gas injection pipe delivers gas to each gas injection sieve pipe, and each gas injection sieve pipe injects gas into a corresponding sealed space, so that as can be seen from fig. 5, when passing through a sealed space, the next hydraulic expansion sealing plug is provided with one less gas injection port, and the gas injection sieve pipe corresponding to the lacking gas injection port is responsible for injecting gas into the previous sealed space.
After gas is injected into each sealed space, in order to measure an accurate rock stratum pore pressure value, as shown in fig. 6, a period of time needs to be waited, and after the pressure between the sealed space and the rock stratum pore is balanced, the pressure value of the sealed space is measured, and at this time, because there is no pressure difference between the sealed space and the rock stratum pore, or the existing pressure difference is small and can be ignored, the measured pressure value of the sealed space can be used as the pressure value of the rock stratum pore. Since the present embodiment is a formation pore pressure value obtained by measurement, the data is an actual formation pore pressure value. It can be understood that when a plurality of hydraulic expansion hole sealing plugs exist in the hole to be measured, a plurality of sealing spaces are generated, and the pressure value measured by each sealing space can reflect the rock stratum pore pressure values corresponding to different depths in the hole to be measured.
In one implementation, in order to ensure the accuracy of the measurement result, multiple sets of formation pore pressure tests may be performed, test data may be recorded, and an average value may be obtained as a finally obtained formation pore pressure value. And after the test is finished, the gas stop valve can be opened, and the gas pressure in the closed space is completely discharged. And opening the water stop valve, and completely discharging the water pressure in the cavity of the water pressure expansion hole sealing plug. And the water pressure expansion hole sealing plug in the drill hole is completely pulled out of the hole to be detected by using the water injection pipe for the next use.
It should be emphasized that, although there is also a method for measuring the actual pressure value of the formation pore by the vibrating wire pore pressure test sensor, the method needs to embed the vibrating wire pore pressure test sensor in advance, and convert the pore pressure signal of the formation into an electrical signal for measurement and analysis. And the method adopts the same equipment to measure the pore pressure at a single point position, and if the pore pressure at different depths needs to be measured, a plurality of drill holes are needed and are buried for a plurality of times, so that the repeated use is not realized, the burying cost is increased, the drill holes can be influenced mutually, and the testing precision is reduced. In addition, because the sensor is the passive type and measures, need can obtain accurate stratum pore pressure value after burying for a long time, if the time limit for a project is nervous, the stratum pore pressure value accuracy degree of surveying temporarily is lower. In addition, when the traditional pore pressure test sensor penetrates into a rock stratum, the traditional pore pressure test sensor is influenced by the temperature of the rock stratum at different positions, the pore pressure of the rock stratum is calculated according to a calibration coefficient measured at normal temperature, and the result can generate deviation. The components used in the measurement process are not required to be embedded, can be repeatedly used, are not influenced by the temperature of the tested rock stratum, and can be used for simultaneously carrying out pore pressure test on multiple points of the rock stratum drilling hole.
Based on the above embodiments, the present invention further provides a multi-point formation pore pressure testing system, as shown in fig. 7, the system includes:
the drilling mechanism 01 is used for acquiring measurement position information and generating a hole to be measured on a rock stratum to be measured according to the measurement position information;
the sealing mechanism 02 is used for controlling a hydraulic expansion hole sealing plug to seal the hole to be detected to obtain a sealed space;
the testing mechanism 03 is configured to obtain a pressure value of the sealed space after injecting gas into the sealed space, and determine a rock stratum pore pressure value corresponding to the rock stratum to be tested according to the pressure value of the sealed space.
In one implementation, the drilling mechanism includes:
the parameter acquisition device is used for acquiring a preset depth value of the test position and an outer diameter value of the hydraulic expansion hole sealing plug;
the size calculation device is used for determining measurement position information according to the depth value of the test position and the outer diameter numerical value of the hydraulic expansion hole sealing plug;
and the drilling machine is used for drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
In one implementation, the hydraulic expansion plugs are a plurality of hydraulic expansion plugs; the closure mechanism includes: the water injection pipe and the plurality of hydraulic expansion hole sealing plugs are arranged on the water injection pipe;
the water injection pipe is used for sequentially connecting the plurality of hydraulic expansion hole sealing plugs and sequentially moving the plurality of hydraulic expansion hole sealing plugs into the hole to be detected;
the hydraulic expansion hole sealing plug is used for sealing the hole to be detected together with the water injection pipe to obtain a sealed space; the sealed space is a space formed between two adjacent hydraulic expansion sealing hole plugs and the hole wall of the hole to be measured in the plurality of hydraulic expansion sealing hole plugs.
In one implementation, the closure mechanism further comprises:
and the water injection control device is used for controlling the water injection pipe to inject water into the plurality of water pressure expansion hole sealing plugs until a pressure value generated between the water pressure expansion hole sealing plug and the hole wall of the hole to be detected reaches a preset pressure threshold value so as to seal the hole to be detected.
In one implementation, the testing mechanism includes:
the gas injection pipe is used for connecting two adjacent hydraulic expansion hole sealing plugs in the plurality of hydraulic expansion hole sealing plugs;
the gas injection control device is used for controlling the gas injection pipe to inject gas into the sealed space until a preset gas injection time length is reached;
and the air pressure measuring device is used for acquiring the air pressure value of the sealed space at preset time intervals after the air injection is finished, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be measured.
In summary, the invention discloses a multi-point rock stratum pore pressure testing method and system, by obtaining measurement position information, a hole to be tested is generated on a rock stratum to be tested according to the measurement position information. And then sealing the hole to be detected through the hydraulic expansion hole sealing plug to obtain a sealed space. And finally, after the sealed space is injected with gas, obtaining the pressure value of the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be detected according to the pressure value of the sealed space. This embodiment is through drilling on the stratum to put into the hole with water pressure inflation sealing plug, carry out the sealed back to this hole through water pressure inflation sealing plug, obtain actual stratum pore pressure value through measuring the pressure value in this hole. The method solves the problem that the formation pore pressure calculated by the traditional prediction method possibly has larger deviation with the actual formation pore pressure in the prior art.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (4)
1. A multi-site formation pore pressure testing method, comprising:
acquiring measurement position information, and generating a hole to be measured on a rock stratum to be measured according to the measurement position information;
sequentially moving a plurality of water pressure expansion hole sealing plugs into the hole to be detected through a water injection pipe, wherein the plurality of water pressure expansion hole sealing plugs are sequentially connected through the water injection pipe, and each water pressure expansion hole sealing plug is provided with a water injection port;
injecting water into the plurality of water pressure expansion hole sealing plugs through the water injection pipe until a pressure value generated between the water pressure expansion hole sealing plugs and the hole wall of the hole to be detected reaches a preset pressure threshold value, so as to seal the hole to be detected;
taking a space formed between two adjacent hydraulic expansion sealing plugs and the wall of the hole to be measured in the plurality of hydraulic expansion sealing plugs as a sealed space;
injecting gas into the sealed space according to a gas injection sieve tube, so that the gas injected into the sealed space is dissipated to pores of a rock stratum until a preset gas injection duration is reached, wherein two adjacent water pressure expansion hole sealing plugs in the plurality of water pressure expansion hole sealing plugs are connected through the gas injection sieve tube, the gas injection sieve tube is connected with a gas injection tube, a gas pressure gauge is arranged on the gas injection tube and is connected with a high-pressure gas source, when gas is injected into the sealed space, the high-pressure gas source is opened, a gas stop valve is closed, the gas flows into different gas injection sieve tubes through the gas injection tube, and the gas is injected into different sealed spaces through the gas injection sieve tubes;
and after gas injection is finished, acquiring the air pressure value of the sealed space at preset time intervals, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be detected, wherein the pressure value measured by each sealed space is used for reflecting the rock stratum pore pressure value corresponding to different depths in the hole to be detected.
2. The multi-point rock formation pore pressure testing method according to claim 1, wherein the obtaining of the measurement position information and the generating of the hole to be tested on the rock formation to be tested according to the measurement position information comprise:
acquiring a preset depth value of a test position and an outer diameter value of the hydraulic expansion hole sealing plug;
determining measurement position information according to the depth value of the test position and the outer diameter value of the hydraulic expansion hole sealing plug;
and drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
3. A multi-site formation pore pressure testing system, the system comprising:
the drilling mechanism is used for acquiring measurement position information and generating a hole to be measured on a rock stratum to be measured according to the measurement position information;
the sealing mechanism is used for controlling the hydraulic expansion hole sealing plug to seal the hole to be detected to obtain a sealed space;
the testing mechanism is used for acquiring the pressure value of the sealed space after injecting gas into the sealed space, and determining the rock stratum pore pressure value corresponding to the rock stratum to be tested according to the pressure value of the sealed space;
the hydraulic expansion sealing hole plugs are a plurality of hydraulic expansion sealing hole plugs, wherein each hydraulic expansion sealing hole plug is provided with a water injection port; the closure mechanism includes: the water injection pipe and the plurality of hydraulic expansion hole sealing plugs are arranged on the water injection pipe;
the water injection pipe is used for sequentially connecting the plurality of hydraulic expansion hole sealing plugs and sequentially moving the plurality of hydraulic expansion hole sealing plugs into the hole to be detected;
the hydraulic expansion hole sealing plug is used for sealing the hole to be detected together with the water injection pipe to obtain a sealed space; the sealed space is a space formed between two adjacent hydraulic expansion sealed hole plugs and the hole wall of the hole to be measured in the plurality of hydraulic expansion sealed hole plugs;
the closure mechanism further comprises:
the water injection control device is used for controlling the water injection pipe to inject water into the plurality of water pressure expansion hole sealing plugs until a pressure value generated between the water pressure expansion hole sealing plugs and the hole walls of the holes to be detected reaches a preset pressure threshold value so as to seal the holes to be detected;
the test mechanism includes:
the gas injection pipe is used for connecting two adjacent hydraulic expansion hole sealing plugs in the plurality of hydraulic expansion hole sealing plugs;
the gas injection control device is used for controlling the gas injection pipe to inject gas into the sealed space, so that the gas injected into the sealed space is dissipated to pores of a rock stratum until a preset gas injection duration is reached, wherein two adjacent water pressure expansion hole sealing plugs in the plurality of water pressure expansion hole sealing plugs are connected through a gas injection screen pipe, the gas injection screen pipe is connected with the gas injection pipe, a gas pressure gauge is arranged on the gas injection pipe and is connected with a high-pressure gas source, when gas is injected into the sealed space, the high-pressure gas source is opened, a gas stop valve is closed, the gas flows into different gas injection screen pipes through the gas injection pipe, and the gas is injected into different sealed spaces through the gas injection screen pipes;
and the air pressure measuring device is used for acquiring the air pressure value of the sealed space at preset time intervals after the air injection is finished, and taking the air pressure value of the sealed space as the rock stratum pore pressure value corresponding to the rock stratum to be measured, wherein the pressure value measured by each sealed space is used for reflecting the rock stratum pore pressure value corresponding to different depths in the hole to be measured.
4. The multi-site formation pore pressure testing system of claim 3, wherein the drilling mechanism comprises:
the parameter acquisition device is used for acquiring a preset depth value of the test position and an outer diameter value of the hydraulic expansion hole sealing plug;
the size calculation device is used for determining measurement position information according to the depth value of the test position and the outer diameter numerical value of the hydraulic expansion hole sealing plug;
and the drilling machine is used for drilling the rock stratum to be measured according to the measurement position information to obtain the hole to be measured.
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| CN104343439A (en) * | 2013-08-06 | 2015-02-11 | 中国石油天然气股份有限公司 | Electric direct-reading seal-checking system for separate injection pipe column and using method thereof |
| CN105239975A (en) * | 2015-10-30 | 2016-01-13 | 中国石油天然气股份有限公司 | Monitoring system for water injection state of each layer of multi-layer water injection well |
| CN206707703U (en) * | 2017-04-01 | 2017-12-05 | 中国石油集团渤海钻探工程有限公司 | Formation pore pressure measuring while drilling device |
| CN109269955B (en) * | 2018-09-29 | 2023-11-21 | 中国矿业大学 | In-situ testing device and method for permeability of coal stratum |
| CN209324340U (en) * | 2018-12-27 | 2019-08-30 | 北京捷威思特科技有限公司 | Slim-hole stratum testing sampler |
| CN209707315U (en) * | 2019-03-18 | 2019-11-29 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of dyke multilayer is the same as position seepage flow pressure measuring unit |
| CN111272636A (en) * | 2020-03-16 | 2020-06-12 | 中国科学院武汉岩土力学研究所 | Device and method for measuring rock porosity under different kinds of stress |
| CN112253247B (en) * | 2020-08-26 | 2021-10-22 | 中煤科工集团沈阳研究院有限公司 | Gas pressure rapid measuring device and measuring method |
| CN112417778A (en) * | 2020-11-18 | 2021-02-26 | 中国石油大学(华东) | Pressure control well cementation method and system based on deep shaft cement slurry system simulation |
| CN112696182A (en) * | 2021-01-12 | 2021-04-23 | 山西银锋科技有限公司 | Drilling hole plugging, fracturing and water injection integrated structure and using method thereof |
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