CN111894560B - Leakage-detection-while-drilling plugging method in drilling process - Google Patents
Leakage-detection-while-drilling plugging method in drilling process Download PDFInfo
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- CN111894560B CN111894560B CN202010818042.1A CN202010818042A CN111894560B CN 111894560 B CN111894560 B CN 111894560B CN 202010818042 A CN202010818042 A CN 202010818042A CN 111894560 B CN111894560 B CN 111894560B
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- 238000005553 drilling Methods 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 11
- 230000003213 activating effect Effects 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims description 21
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 238000013517 stratification Methods 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
Abstract
The application relates to a leakage-detection-while-drilling plugging method in a drilling process, which comprises the following steps of: (1) Acquiring basic data of drilling, the position of a lost circulation zone of an upper open hole section, drilling construction parameters and the like; (2) The method comprises the steps of monitoring annulus pressure difference at two ends of a downhole throttling component in real time in the drilling process, and monitoring the change condition of the flow of a drilling fluid inlet and outlet or the drilling fluid quantity of a mud tank on the ground; (3) when the leakage occurs, determining the position of the leakage layer; (4) After the position of the leaking layer is determined, opening the bypass valve for activating for a plurality of times, and performing leaking stoppage operation; (5) After the plugging operation is finished, if no leakage occurs, closing the bypass valve for activating for a plurality of times, and recovering drilling; (6) After the plugging operation is finished, if leakage exists, judging whether a leakage layer is plugged, and if not, adjusting a plugging slurry formula to perform the plugging operation; if the plugging is performed, after the position of the plugging layer is determined according to the step (3), plugging operation is performed according to the step (4). The application can judge the position of the leakage layer while drilling, and realize the leakage stopping operation without taking off the drill.
Description
Technical Field
The application relates to a leakage-detection-while-drilling plugging method in a drilling process, belongs to the technical field of drilling construction, and can be used for drilling construction with multiple leakage layers in an open hole section.
Background
In drilling construction operations, lost circulation often occurs due to lost circulation of the drill. For areas with low exploration or complex geological structures, the same open hole section often drills multiple sets of leaks due to formation cracks or macroporosity development. When lost circulation occurs, the lost circulation location is not necessarily downhole, as lost circulation at the upper wellbore section may reoccur. Due to uncertainty of the position of the leakage layer, blindness exists in the plugging work, namely the drilling construction period is influenced, the drilling cost is increased, and even underground complex expansion can be caused.
The inventor shows that the key points for solving the problem that a plurality of sets of leakage layers exist in an open hole section are as follows: while drilling, the position of lost circulation is determined, and the plugging operation is realized without tripping. If the leakage layer can be found in time, the leakage blocking operation can be realized without taking out the drill, the influence of the lost circulation on the drilling can be prevented or slowed down, the complex drilling and the occurrence of accidents are prevented, and the drilling safety is ensured.
At present, a comprehensive analysis method is generally adopted for analyzing the lost circulation position in the well on site, and the capability of accurately and timely positioning the lost circulation position is not provided, so that the difficulty is increased for plugging. The hydrodynamic test method is only suitable for the existence of a single leakage layer in a well, and the accuracy is more affected. The method adopts an instrument measurement method to determine the position of a leakage layer, such as a well temperature method, a thermal resistance method, a sonic measurement method, a turbine flowmeter method, a noise method, an electromagnetic measuring instrument and the like, and the methods need to take out a drilling tool in a well and then measure the drilling tool, so that the operation period can be greatly prolonged due to the lack of timeliness, and the use of the instrument can be greatly limited under the complex conditions of instability, blowout and the like of a well wall due to the existence of a large size in some instruments such as the electromagnetic measuring instrument structure. When small lost circulation occurs in the well, on-site plugging while drilling can be adopted, and for larger lost circulation, plugging operation is usually carried out on site by adopting a tripping drill rod after tripping so as to avoid plugging particles to plug downhole tools such as a screw rod, and the like, so that the operation time is often increased, and the risk of downhole operation is increased.
Therefore, when a plurality of leakage layers exist in the open hole section, how to quickly and accurately judge the leakage position and realize the plugging operation without taking out the drill, and the method becomes a technical problem to be solved in the drilling industry.
Disclosure of Invention
The technical purpose of the application is that: aiming at the defects that when a plurality of leakage layers exist in an open hole section in the drilling process, the leakage layers are difficult to identify and the leakage blocking operation is carried out by taking out the drill, the method for rapidly and accurately judging the position of the leakage layers and realizing the leakage blocking operation without taking out the drill in the drilling process is provided.
In order to achieve the above object, the present application provides a technical solution as follows:
a method for leak detection and plugging while drilling in the drilling process comprises the following steps:
(1) Acquiring basic data of drilling, an upper open hole section lost circulation position and drilling construction parameters, wherein the drilling construction parameters comprise: slurry pump displacement, vertical pressure, etc.;
(2) Collecting annulus pressure difference at two ends of an underground throttling component and drilling fluid inlet and outlet flow or mud tank drilling fluid quantity change data;
(3) Judging whether leakage occurs according to the flow of the drilling fluid inlet and outlet or the change condition of the drilling fluid quantity of the mud tank;
if leakage occurs, the following operation steps are performed:
(4) Adjusting the position of the underground throttling component and monitoring the annular pressure difference change at the two ends of the underground throttling component by lifting out part of the drilling tool, and determining the position of the leakage layer;
(5) After the position of the leakage layer is determined, lifting the drilling tool to the position above the leakage layer, opening a plurality of times of activation bypass valves, injecting leakage blocking slurry, and performing one-time leakage blocking operation;
(6) After the primary plugging operation is finished, judging whether leakage exists or not:
if no leakage occurs, closing the bypass valve for multiple times, and continuing drilling operation;
if leakage exists, the underground throttling component is lifted to a safe position at the upper part of the leakage layer, mud is circulated, and whether the leakage layer is blocked or not is judged according to annulus pressure difference at two ends of the underground throttling component:
(61) If the leakage layer is not blocked, adjusting the formula of the leakage blocking slurry, and performing secondary leakage blocking operation until the leakage layer is free of leakage;
(62) If the leakage layer is blocked, the upper well section still has the leakage layer, and the steps (4) - (6) are continuously repeated until the leakage is successfully blocked, the bypass valve is closed for a plurality of times, and the drilling operation is continued.
Preferably, in the step (4): the method for determining the leakage layer position comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that of the underground throttling component without leakage, the leakage layer is below the throttling component in the drilling tool;
and if the annulus pressure difference at the two ends of the underground throttling component is unchanged compared with the annulus pressure difference at the two ends of the underground throttling component, indicating that the leakage layer is above the throttling component.
Preferably, the relationship between the annular pressure difference and the leak rate at the two ends of the downhole throttling component is as follows:
ΔP＝P 1 -P 2 ＝(ρ slurry -ρ Liquid and its preparation method )glcosα+K f (Q Displacement volume -Q Leakage device ) 1.8 ≈K f (Q Displacement volume -Q Leakage device ) 1.8
Wherein: ΔP-differential pressure across the downhole choke in MPa; p (P) 1 -the pressure at the front end of the downhole choke member in MPa; p (P) 2 -the pressure at the rear end of the downhole choke in MPa; ρ Slurry Drilling fluid density in g/cm 3 ；ρ Liquid and its preparation method -density of liquid in line of differential pressure sensor in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The unit of the distance between the measuring points at the two ends of the underground throttling component is m; alpha-well inclination angle in degrees; k (K) f -friction coefficient; q (Q) Displacement volume -mud pump displacement in L/s; q (Q) Leakage device -leak rate in L/s.
Preferably, in the step (4), the method for determining the leakage position specifically includes the following steps:
a. when the annular pressure difference at two ends of the throttling component is suddenly reduced in the real drilling, the drilling fluid leakage monitored on the ground is also detected, and the leakage layer can be judged to be at the bottom of the well;
b. the drilling fluid leakage of ground monitoring in the real drilling is detected, and the annular pressure difference at two ends of the throttling component is not changed when the underground monitoring is carried out, so that the leakage layer can be judged not to be at the bottom of the well.
The leak-off layer is not split into two cases at the bottom of the well:
b1. the upper leakage layer starts to leak, at the moment, the drilling tool is lifted up to the upper leakage layer, the circulation test is carried out with the same discharge capacity during drilling, and whether the upper leakage layer starts to leak again is judged according to the annular pressure difference condition at two ends of the underground monitoring throttling part;
b2. the upper open hole section does not drill and meet the leaking layer, but due to factors such as drilling fluid density, pump blocking and the like, lost circulation caused by the factors such as the drilling fluid density, pump blocking and the like can be combined with geological data, the drilling tool is lifted to the position above the suspected weak stratum to circulate with the same displacement when drilling, and the leaking layer position is determined according to the change of annular pressure difference at two ends of the underground monitoring throttling part.
Preferably, in the step (5), the bypass valve is activated for multiple times by carrying a signal by an RFID tag or throwing a ball, so that the disadvantage that large particles in the plugging slurry cannot pass through a special downhole tool in the plugging operation process is eliminated.
Preferably, the special downhole tools include, but are not limited to, a screw, a directional MWD (measurement while drilling) tool, a LWD (logging while drilling) tool.
Preferably, in the step (6), the plugging operation is performed by activating the bypass valve to close and open for a plurality of times, and the plugging position and the plugging operation are performed on a plurality of plugging layers of the open hole section from bottom to top.
Preferably, the basic data of the well includes, but is not limited to, well depth, wellbore diameter, geologic stratification.
The method for leak detection and plugging while drilling in the drilling process has the following advantages: the position of the leakage layer in the drilling process is conveniently, rapidly and accurately judged by utilizing the change of the circulating pressure difference at the two ends of the throttling component, the leakage layer is characterized by strong timeliness, convenience, easiness, simplicity, practicability, accuracy, reliability and the like, the leakage layer is determined, the leakage blocking operation can be realized without taking off the drill by opening the bypass valve for a plurality of times, the leakage blocking slurry particles are not limited by a downhole drilling tool, and the technical requirements of the downhole leakage blocking operation can be effectively and reliably met.
Drawings
FIG. 1 is a schematic diagram of a method for leak testing while drilling in a drilling process according to the present application.
Detailed Description
The present application will be further described with reference to the drawings and the specific embodiments in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Embodiment 1, the application provides a method for leak testing and plugging while drilling in the drilling process, which comprises the following steps:
(1) Acquiring basic data of drilling, an upper open hole section lost circulation position and drilling construction parameters, wherein the drilling construction parameters comprise: slurry pump displacement, vertical pressure and the like, wherein basic drilling data comprise, but are not limited to, well depth, well diameter, geological stratification and the like, well drilling data are collected, data and data of weak stratum of an upper open hole section and leakage occurs are subjected to arrangement analysis, the arrangement data comprise leakage layer information and leakage stoppage formula performance information, and the leakage layer information comprises stratum, lithology, stratum fluid, leakage speed, leakage position, leakage type and the like; the formula performance information comprises a plugging technical name, a formula, density, bearing capacity, plugging material concentration and the like. Analyzing and sorting weak stratum and lost stratum information, and analyzing and roughly determining the position of a lost stratum section according to collected and sorted original data through acquired drilled well data so as to conveniently and underground lost stratum when lost occurs;
(2) And collecting annulus pressure difference at two ends of the underground throttling component. The method comprises the steps of monitoring annulus pressure difference at two ends of a downhole throttling component in real time in the drilling process, simultaneously transmitting annulus pressure difference data to a ground acquisition system through electromagnetic or mud pulse signals, and simultaneously monitoring the change condition of drilling fluid inlet and outlet flow or mud tank drilling fluid amount on the ground;
(3) Judging whether leakage occurs according to the change condition of the flow rate of the drilling fluid inlet and outlet or the drilling fluid quantity of the mud tank, and when leakage occurs in the well, pumping part or all of the drilling fluid in the well into the stratum, so that the flow rate of the drilling fluid inlet and outlet or the drilling fluid quantity of the mud tank can change, which is well known to the person skilled in the art, so that whether leakage occurs can be judged according to the change condition of the flow rate of the drilling fluid inlet and outlet or the drilling fluid quantity of the mud tank;
if leakage occurs, the following operation steps are performed:
(4) Adjusting the position of the underground throttling component and monitoring the annular pressure difference change at the two ends of the underground throttling component by lifting out part of the drilling tool, and determining the position of the leakage layer;
(5) After the position of the leakage layer is determined, the drilling tool is lifted to the position above the leakage layer, the multiple-activation bypass valve is opened, the leakage slurry is injected, and one-time leakage stopping operation is carried out.
(6) After the primary plugging operation is finished, judging whether leakage exists or not:
if no leakage occurs, closing the bypass valve for multiple times, and continuing drilling operation;
if leakage exists, the underground throttling component is lifted to a safe position at the upper part of the leakage layer, mud is circulated, and whether the leakage layer is blocked or not is judged according to annulus pressure difference at two ends of the underground throttling component:
(61) If the leakage layer is not blocked, adjusting the formula of the leakage blocking slurry, and performing secondary leakage blocking operation until the leakage layer is free of leakage;
(62) If the leakage layer is blocked, the upper well section still has the leakage layer, and the steps (4) - (6) are continuously repeated until the leakage is successfully blocked, the bypass valve is closed for a plurality of times, and the drilling operation is continued.
Example 2, based on example 1, in the step (4): the method for determining the leakage layer position comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that of the underground throttling component without leakage, the leakage layer is below the throttling component in the drilling tool; if the annular pressure difference at the two ends of the underground throttling component is unchanged compared with that of the underground throttling component when no leakage occurs, the leakage layer is described above the throttling component, and the basis for determining the leakage layer position is as follows: when the well leaks, part or all of drilling fluid pumped into the well leaks into the stratum, the annular drilling fluid flow above the leaking layer is reduced, and the annular drilling fluid flow below the leaking layer is unchanged, so that when the throttling part in the drilling tool is above the leaking layer, the annular pressure difference at two ends is reduced compared with that when the throttling part is below the leaking layer, and when the throttling part is below the leaking layer, the annular pressure difference at two ends is unchanged from that when the throttling part is not leaked. In the application, the applicant also provides a relation between annulus pressure difference and leakage speed at two ends of the underground throttling component, which is as follows:
ΔP＝P 1 -P 2 ＝(ρ slurry -ρ Liquid and its preparation method )glcosα+K f (Q Displacement volume -Q Leakage device ) 1.8 ≈K f (Q Displacement volume -Q Leakage device ) 1.8
Wherein: ΔP-differential pressure across the downhole choke in MPa; p (P) 1 -the pressure at the front end of the downhole choke member in MPa; p (P) 2 -the pressure at the rear end of the downhole choke in MPa; ρ Slurry Drilling fluid density in g/cm 3 ；ρ Liquid and its preparation method -density of liquid in line of differential pressure sensor in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The unit of the distance between the measuring points at the two ends of the underground throttling component is m; alpha-well inclination angle in degrees; k (K) f -friction coefficient; q (Q) Displacement volume -mud pump displacement in L/s; q (Q) Leakage device -leak rate in L/s; the pressure difference between two ends of the underground throttling component can be obtained through the formula, so that the position of the leakage layer can be quickly determined.
Example 3, on the basis of example 1 or example 2, in the real drill, referring to fig. 1, the method for determining the leakage position in the step (4) is specifically as follows:
a. the annular pressure difference at two ends of the throttling component is monitored to be suddenly reduced in the real drilling, and meanwhile, the ground is also monitored to be lost in drilling fluid, so that the lost layer can be judged to be at the bottom of the well;
b. the ground in the real drilling monitors the drilling fluid leakage, and the annular pressure difference at two ends of the throttling component is not changed, so that the leakage layer can be judged not to be at the bottom of the well, wherein the leakage layer is not divided into two conditions at the bottom of the well:
b1. the upper leakage layer starts to leak, at the moment, the drilling tool is lifted up to the upper leakage layer, the circulation test is carried out with the same discharge capacity during drilling, and whether the upper leakage layer starts to leak again is judged according to the annular pressure difference condition at two ends of the underground monitoring throttling part;
b2. the upper open hole section does not drill and meet the leaking layer, but due to factors such as drilling fluid density, pump blocking and the like, lost circulation caused by the factors such as the drilling fluid density, pump blocking and the like can be combined with geological data, the drilling tool is lifted to the position above the suspected weak stratum to circulate with the same displacement when drilling, and the leaking layer position is determined according to the change of annular pressure difference at two ends of the underground monitoring throttling part.
As a preferable scheme, in the step (6), the leakage stopping operation is carried out by activating the bypass valve to close and open for a plurality of times, and the leakage stopping operation is carried out on a plurality of leakage stopping layers of the open hole section from bottom to top, so that the leakage stopping layers are sequentially sealed one by one, and the leakage stopping is more thorough.
The foregoing examples merely illustrate embodiments of the application and are described in more detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (8)
1. The leakage-detection-while-drilling plugging method in the drilling process is characterized by comprising the following steps of:
(1) Acquiring basic data of drilling, an upper open hole section lost circulation position and drilling construction parameters, wherein the drilling construction parameters comprise: slurry pump displacement, vertical pressure;
(2) Collecting annulus pressure difference at two ends of an underground throttling component and drilling fluid inlet and outlet flow or mud tank drilling fluid quantity change data;
(3) Judging whether leakage occurs according to the flow of the drilling fluid inlet and outlet or the change condition of the drilling fluid quantity of the mud tank;
if leakage occurs underground, the following operation steps are carried out:
(4) Determining the position of the leakage layer by the position of the underground throttling component and monitoring the annular pressure difference change at the two ends of the underground throttling component;
(5) After the position of the leakage layer is determined, lifting the drilling tool to the position above the leakage layer, opening a plurality of times of activation bypass valves, injecting leakage blocking slurry, and performing one-time leakage blocking operation;
(6) After the primary plugging operation is finished, judging whether leakage exists or not:
if no leakage occurs, closing the bypass valve for multiple times, and continuing drilling operation;
if leakage exists, the underground throttling component is lifted to a safe position at the upper part of the leakage layer, mud is circulated, and whether the leakage layer is blocked or not is judged according to annulus pressure difference at two ends of the underground throttling component:
(61) If the leakage layer is not blocked, adjusting the formula of the leakage blocking slurry, and performing secondary leakage blocking operation until the leakage layer is free of leakage;
(62) If the leakage layer is blocked, indicating that the upper well section still has the leakage layer, continuing to repeat the steps (4) - (6) until the leakage is successfully blocked, closing the activated bypass valve for a plurality of times, and continuing the drilling operation;
in the step (4):
the method for determining the leakage layer position comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that of the underground throttling component without leakage, the leakage layer is below the throttling component in the drilling tool;
and if the annulus pressure difference at the two ends of the underground throttling component is unchanged or is within an error compared with the condition that no leakage occurs, indicating that the leakage layer is above the throttling component.
2. The leak detection while drilling plugging method as defined in claim 1, wherein: the relation between the annular pressure difference and the leak speed at the two ends of the underground throttling component is as follows:
ΔP＝P 1 -P 2 ＝( slurry - Liquid and its preparation method )glcosα+K f (Q Displacement volume -Q Leakage device ) 1.8 ≈K f (Q Displacement volume -Q Leakage device ) 1.8
Wherein: ΔP-differential pressure across the downhole choke in MPa; p (P) 1 -the pressure at the front end of the downhole choke member in MPa; p (P) 2 -the pressure at the rear end of the downhole choke in MPa; ρ Slurry Drilling fluid density in g/cm 3 ；ρ Liquid and its preparation method -density of liquid in line of differential pressure sensor in g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The unit of the distance between the measuring points at the two ends of the underground throttling component is m; alpha-well inclination angle in degrees; k (K) f -friction coefficient; q (Q) Displacement volume -mud pump displacement in L/s; q (Q) Leakage device -leak rate in L/s.
3. The leak detection while drilling plugging method as defined in claim 1, wherein: in the step (4), the method for determining the leakage position specifically comprises the following steps:
a. the annular pressure difference at two ends of the throttling component is monitored to be suddenly reduced in the real drilling, and meanwhile, the ground is also monitored to be lost in drilling fluid, so that the lost layer can be judged to be at the bottom of the well;
b. the ground in the real drill monitors the leakage of drilling fluid, and the underground monitor detects that the annular pressure difference at two ends of the throttling component is unchanged or within an error, so that the leakage layer can be judged not to be at the bottom of the well.
4. The leak detection while drilling plugging method as defined in claim 3, wherein the leak layer is not divided into two cases at the bottom of the well:
b1. the upper leakage layer starts to leak, at the moment, the drilling tool is lifted up to the upper leakage layer, the circulation test is carried out with the same discharge capacity during drilling, and whether the upper leakage layer starts to leak again is judged according to the annular pressure difference condition at two ends of the underground monitoring throttling part;
b2. the upper open hole section does not drill and meet the leaking layer, but well leakage caused by the factors of drilling fluid density and pump blocking can be combined with geological data, the drilling tool is lifted to the position above the suspected weak stratum to circulate with the same displacement when drilling, and the leaking layer position is determined according to the change of annular pressure difference at two ends of the underground monitoring throttling part.
5. The leak detection while drilling plugging method according to claim 1, wherein the activating the bypass valve for multiple times in step (5) is activating the bypass valve for multiple times by carrying a signal with an RFID tag or by throwing a ball, and the disadvantage that large particles in the plugging slurry cannot pass through a special downhole tool is eliminated during the plugging operation.
6. The leak-while-drilling plugging method of claim 5, wherein the special downhole tool includes, but is not limited to, a screw, a directional MWD (measurement-while-drilling) tool, a LWD (logging-while-drilling) tool.
7. The leak detection while drilling plugging method according to claim 6, wherein the plugging operation in step (6) is performed by activating the bypass valve to close and open a plurality of times, and the leak detection and plugging operation is performed on a plurality of leak layers of the open hole section from bottom to top.
8. The leak-while-drilling plugging method of claim 1, wherein the drilling base data includes, but is not limited to, well depth, wellbore diameter, and geologic stratification.
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| CN113803059B (en) * | 2021-08-02 | 2024-04-02 | 中石化石油工程技术服务有限公司 | Leakage finding and plugging method for long open hole section well leakage |
| CN113550712B (en) * | 2021-09-18 | 2022-01-11 | 德仕能源科技集团股份有限公司 | Natural gas well plugging treatment method |
| CN113898313B (en) * | 2021-10-13 | 2023-05-30 | 中石化石油工程技术服务有限公司 | Shale gas horizontal well oil-based drilling fluid collapse-preventing and leakage-stopping construction method |
| CN113818800B (en) * | 2021-10-20 | 2022-06-07 | 中国地质大学（北京） | Emergency rescue drilling is along with boring water shutoff device |
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