CN111894560A - Leakage detection and plugging method while drilling in drilling process - Google Patents
Leakage detection and plugging method while drilling in drilling process Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 134
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 230000003213 activating effect Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 238000013517 stratification Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 210000001635 urinary tract Anatomy 0.000 claims description 3
- 208000019206 urinary tract infection Diseases 0.000 claims description 3
- 230000002411 adverse Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 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
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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
- 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
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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
- E21B47/10—Locating fluid leaks, intrusions or movements
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Abstract
The invention relates to a method for leak detection and plugging while drilling in a drilling process, which comprises the following steps: (1) acquiring basic data of drilling, the position of a leaking layer of an upper open hole section, drilling construction parameters and the like; (2) monitoring the annular pressure difference at two ends of an underground throttling component in real time in the drilling process, and simultaneously monitoring the flow of drilling fluid in and out or the drilling fluid quantity change condition of a mud tank on the ground; (3) when leakage occurs, determining the position of a leakage layer; (4) after the leaking position is determined, opening a bypass valve for activating for many times to perform leaking stoppage operation; (5) after the plugging operation is finished, if no leakage exists, closing the bypass valve which is activated for many times, and recovering drilling; (6) after the plugging operation is finished, if the leakage is lost, judging whether a leaking layer is blocked, if the leaking layer is not blocked, adjusting the formula of the plugging slurry, and performing the plugging operation; and if the leakage is blocked, determining the leakage position according to the step (3), and then performing leakage blocking operation according to the step (4). The invention can judge the position of the leaking layer while drilling and realize the leaking stoppage operation without pulling out the drill.
Description
Technical Field
The invention relates to a method for leakage detection and leakage stoppage while drilling in a drilling process, belongs to the technical field of drilling construction, and can be used for drilling construction of a plurality of leakage layers in an open hole section.
Background
In drilling construction operations, lost circulation often occurs due to the drilling of lost circulation channels. For areas with low exploration or complex geological structures, multiple leaking layers are often drilled in the same open hole section due to formation fracture or macroporosity development. When lost circulation occurs, the lost circulation location is not necessarily downhole, as the lost circulation layer of the upper interval may be lost again. Due to the uncertainty of the position of the leaking layer, the leaking stoppage work has blindness, the drilling period is influenced, the drilling cost is increased, and even underground complex expansion can be caused.
The inventor shows that the key for solving the problem of multiple sets of leaking layers in the open hole well section is two points: the position of the lost circulation is determined while drilling, and the lost circulation operation is realized without pulling out the drill. If the leakage layer can be found in time, the leakage stopping operation can be realized without pulling out the drill, the influence of the lost circulation on the drilling well can be prevented or slowed down, the complex drilling well and the occurrence of accidents are prevented, and the safety of the drilling well is ensured.
At present, a comprehensive analysis method is generally adopted for analyzing the leakage position in a well on site, and the comprehensive analysis method does not have the capability of accurately and timely positioning the leakage position, so that the difficulty is increased for plugging. The hydrodynamic test method is only suitable for a single leakage layer in the well, and the accuracy of the hydrodynamic test method is influenced by a plurality of factors. The position of a leaking layer is determined by adopting an instrument measuring method, such as a well temperature method, a thermal resistance method, a sonic measuring method, a turbine flowmeter method, a noise method, an electromagnetic measuring instrument and the like, the method needs to measure after a drilling tool in a well is lifted out, the working period can be greatly prolonged due to the lack of timeliness, the sizes of some instruments such as the electromagnetic measuring instrument are large, and the use of the instruments is greatly limited under the complex conditions of instability of a well wall, blowout and the like. When small well leakage occurs in the well, the field can be used for plugging while drilling, and for larger well leakage, the field usually adopts a lower smooth drilling rod to implement plugging operation after tripping so as to avoid plugging particles from blocking underground tools such as a screw rod, which often increases the operation time and increases the underground operation risk.
Therefore, when multiple leakage layers exist in the open hole section, how to quickly and accurately judge the position of the lost circulation and realize the leakage stopping operation without tripping the drill becomes a technical problem to be solved urgently in the drilling industry.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the defects that when a plurality of leaking layers exist in the open hole section in the drilling process, the leaking layer identification is difficult and the plugging operation is carried out during the tripping-out, the method for quickly and accurately judging the position of the leaking layer and realizing the plugging operation without tripping-out in the drilling process is provided.
In order to achieve the above object, the present invention provides a technical solution as follows:
a method for leak detection and plugging while drilling in a drilling process comprises the following steps:
(1) acquiring basic data of drilling, the position of a leaking layer of an upper open hole section and drilling construction parameters, wherein the drilling construction parameters comprise: discharge capacity, vertical pressure and the like of a slurry pump;
(2) acquiring annular pressure difference at two ends of an underground throttling component and drilling fluid inlet and outlet flow or mud tank drilling fluid volume change data;
(3) judging whether leakage occurs according to the flow of the drilling fluid in and out or the drilling fluid quantity change condition of the mud tank;
if the leakage occurs, the following operation steps are carried out:
(4) adjusting the position of the underground throttling component and monitoring the change of annular pressure difference at two ends of the underground throttling component by pulling out part of the drilling tool, and determining the position of a leaking layer;
(5) after the leaking layer is determined, lifting the drilling tool to the position above the leaking layer, opening the bypass valve for multiple times to activate, injecting leaking stoppage slurry, and performing one-time leaking stoppage operation;
(6) after one-time plugging operation is finished, judging whether leakage exists or not:
if no loss exists, closing the bypass valve which is activated for many times, and continuing the drilling operation;
if leakage exists, the underground throttling component is lifted to the upper safe position of the leakage layer, slurry is circulated, and whether the leakage layer is blocked or not is judged according to annular pressure difference at two ends of the underground throttling component:
(61) if the leakage layer is not blocked, adjusting the formula of the leakage stopping slurry, and performing secondary leakage stopping operation until no leakage exists in the leakage layer;
(62) and (4) if the leaking layer is blocked, indicating that the leaking layer still exists in the upper well section, continuously repeating the steps (4) to (6) until the leaking stoppage is successful, closing the bypass valve activated for multiple times, and continuing the drilling operation.
Preferably, in the step (4): the method for determining the position of the leaking layer comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that when no leakage occurs, indicating that 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 when no leakage occurs, the leakage layer is above the throttling component.
Preferably, the relationship between the annular pressure difference and the leakage rate at two ends of the downhole throttling component is as follows:
ΔP＝P1-P2＝(ρslurry composition-ρLiquid for treating urinary tract infection)glcosα+Kf(QDischarge capacity-QLeakage net)1.8≈Kf(QDischarge capacity-QLeakage net)1.8
In the formula: delta P is the pressure difference between two ends of the underground throttling component, and the unit is MPa; p1-the pressure at the front end of the downhole choke, in MPa; p2-the pressure at the rear end of the downhole choke, in MPa; rhoSlurry compositionDrilling fluid density in g/cm3；ρLiquid for treating urinary tract infectionDifferential pressure sensor line liquid density in g/cm3(ii) a l is the distance between the measuring points at two ends of the underground throttling component, and the unit is m; α -well angle in degrees; kf-coefficient of friction resistance; qDischarge capacity-mud pump displacement in L/s; qLeakage netLeak rate in L/s.
Preferably, in the step (4), the method for determining the missing position specifically includes the following steps:
a. when the annular pressure difference at two ends of the throttling component is suddenly reduced during actual drilling and the drilling fluid loss is monitored on the ground, the leaking layer can be judged to be at the bottom of the well;
b. when the drilling fluid loss monitored on the ground during actual drilling is detected, and the annular pressure difference at two ends of the throttling component is not changed when underground monitoring is carried out, the condition that a leaking layer is not positioned at the bottom of a well can be judged.
4. The method for leak detection and plugging while drilling as recited in claim 3, wherein the leak layer is not at the bottom of the well in two cases:
b1. the upper leaking layer begins to leak, the drilling tool is lifted to the position above the upper leaking layer at the moment, the circulation test is carried out according to the same discharge capacity during drilling, and whether the upper leaking layer begins to leak or not is judged according to the condition that the annular pressure difference at two ends of the throttling component is monitored underground;
b2. and (3) the upper open hole section does not drill a leaking layer, but the well leakage is caused by factors such as drilling fluid density, pump holding and the like, a drilling tool is lifted to the position above the suspected weak stratum by combining geological data so as to circulate at the same displacement during drilling, and the position of the leaking layer is determined according to the change of the annular pressure difference at two ends of the throttling component monitored underground.
Preferably, the bypass valve is activated for multiple times in the step (5) by using an RFID tag to carry a signal or throwing a ball, so that the adverse factor that large particles in the plugging slurry cannot pass through a special downhole tool is eliminated in the process of plugging operation.
Preferably, the special downhole tool includes, but is not limited to, a screw, a directional MWD (measurement while drilling) tool, an LWD (logging while drilling) tool.
Preferably, in the plugging operation in the step (6), the positions of the leaking floors and the plugging operation are tested from bottom to top for a plurality of leaking floors of the open hole section by activating the bypass valve for multiple times to close and open.
Preferably, the basic data of the well includes, but is not limited to, well depth, borehole diameter, geological stratification.
The method for leak detection and plugging while drilling in the drilling process has the following advantages: the position of a leaking layer in the drilling process is conveniently, quickly and accurately judged by utilizing the change of the circulating pressure difference at the two ends of the throttling component, the method has the characteristics of strong timeliness, convenience, easiness, simplicity, practicability, accuracy, reliability and the like, the leaking layer can be determined, the leaking stoppage operation can be carried out without tripping the drill by opening the bypass valve for many times, leaking stoppage slurry particles are not limited by an underground drilling tool, and the technical requirement of the underground leaking stoppage operation can be effectively and reliably met.
Drawings
FIG. 1 is a schematic diagram of a leak detection and plugging method during drilling according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment 1 provides a method for leak detection and plugging while drilling in a drilling process, which comprises the following steps:
(1) acquiring basic data of drilling, the position of a leaking layer of an upper open hole section and drilling construction parameters, wherein the drilling construction parameters comprise: the method comprises the steps of (1) slurry pump discharge capacity, vertical pressure and the like, wherein basic data of well drilling comprises but is not limited to well depth, well bore diameter, geological stratification and the like, well drilling data are collected, data and data of weak stratums and leakage loss occurring in upper open hole sections are sorted and analyzed, the sorted data comprise leakage stratum information and leakage stoppage formula performance information, and the leakage stratum information comprises stratums, lithology, stratum fluids, leakage rate, leakage positions, leakage types and the like; the formula performance information comprises the technical name of plugging, the formula, the density, the pressure bearing capacity, the concentration of the plugging material and the like. Analyzing and sorting weak stratum and leaking layer information, and analyzing and roughly determining the position of a leaking layer section according to collected and sorted original data when the underground leaking occurs through the acquired well drilling data;
(2) and collecting the annular pressure difference at two ends of the downhole throttling component. Monitoring the annular pressure difference at two ends of an underground throttling component in real time in the drilling process, simultaneously transmitting annular pressure difference data to a ground acquisition system through an electromagnetic or mud pulse signal, and simultaneously monitoring the flow of a drilling fluid inlet and an outlet or the drilling fluid quantity change condition of a mud tank on the ground;
(3) judging whether leakage occurs according to the flow of the drilling fluid inlet and outlet or the drilling fluid volume of the mud tank, and when the leakage occurs in the well, part or all of the drilling fluid pumped into the well leaks into the stratum, so that the flow of the drilling fluid inlet and outlet or the drilling fluid volume of the mud tank can be changed, which is well known by the technical personnel in the field, and judging whether the leakage occurs according to the flow of the drilling fluid inlet and outlet or the drilling fluid volume change of the mud tank;
if the leakage occurs, the following operation steps are carried out:
(4) adjusting the position of the underground throttling component and monitoring the change of annular pressure difference at two ends of the underground throttling component by pulling out part of the drilling tool, and determining the position of a leaking layer;
(5) after the leaking layer is determined, the drilling tool is lifted to the position above the leaking layer, the bypass valve is activated for multiple times, leaking stoppage slurry is injected, and one-time leaking stoppage operation is carried out.
(6) After one-time plugging operation is finished, judging whether leakage exists or not:
if no loss exists, closing the bypass valve which is activated for many times, and continuing the drilling operation;
if leakage exists, the underground throttling component is lifted to the upper safe position of the leakage layer, slurry is circulated, and whether the leakage layer is blocked or not is judged according to annular pressure difference at two ends of the underground throttling component:
(61) if the leakage layer is not blocked, adjusting the formula of the leakage stopping slurry, and performing secondary leakage stopping operation until no leakage exists in the leakage layer;
(62) and (4) if the leaking layer is blocked, indicating that the leaking layer still exists in the upper well section, continuously repeating the steps (4) to (6) until the leaking stoppage is successful, closing the bypass valve activated for multiple times, and continuing the drilling operation.
Example 2, on the basis of example 1, in the step (4): the method for determining the position of the leaking layer comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that when no leakage occurs, indicating that 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 when no leakage occurs, the leakage layer is above the throttling component, and the basis for determining the position of the leakage layer is as follows: when leakage occurs in the well, part or all of the drilling fluid pumped into the well leaks into the stratum, the flow rate of the annular drilling fluid above the leakage layer is reduced, and the flow rate of the annular drilling fluid below the leakage layer is unchanged. In the present application, the applicant further provides that the relationship between the annular pressure difference at the two ends of the downhole throttling component and the leakage rate is as follows:
ΔP＝P1-P2＝(ρslurry composition-ρLiquid for treating urinary tract infection)glcosα+Kf(QDischarge capacity-QLeakage net)1.8≈Kf(QDischarge capacity-QLeakage net)1.8
In the formula: delta P is the pressure difference between two ends of the underground throttling component, and the unit is MPa; p1-the pressure at the front end of the downhole choke, in MPa; p2-the pressure at the rear end of the downhole choke, in MPa; rhoSlurry compositionDrilling fluid density in g/cm3；ρLiquid for treating urinary tract infectionDifferential pressure sensor line liquid density in g/cm3(ii) a l is the distance between the measuring points at two ends of the underground throttling component, and the unit is m; α -well angle in degrees; kf-coefficient of friction resistance; qDischarge capacity-mud pump displacement in L/s; qLeakage net-leak rate, in L/s; by the formula can be obtainedAnd the pressure difference between two ends of the downhole throttling component is convenient for quickly determining the position of the leaking layer.
Example 3, on the basis of example 1 or example 2, in the actual drilling, referring to fig. 1, the method for determining the missing position in step (4) is specifically as follows:
a. when the annular pressure difference at two ends of the throttling component is suddenly reduced during actual drilling and the drilling fluid loss is monitored on the ground, the leaking layer can be judged to be at the bottom of the well;
b. the method has the advantages that the leakage of the drilling fluid monitored on the ground in the actual drilling process is avoided, the annular pressure difference at two ends of the throttling component is monitored to be unchanged underground, and the leakage layer can be judged to be not in the bottom of the well, wherein the leakage layer is not in the bottom of the well and is divided into two conditions:
b1. the upper leaking layer begins to leak, the drilling tool is lifted to the position above the upper leaking layer at the moment, the circulation test is carried out according to the same discharge capacity during drilling, and whether the upper leaking layer begins to leak or not is judged according to the condition that the annular pressure difference at two ends of the throttling component is monitored underground;
b2. and (3) the upper open hole section does not drill a leaking layer, but the well leakage is caused by factors such as drilling fluid density, pump holding and the like, a drilling tool is lifted to the position above the suspected weak stratum by combining geological data so as to circulate at the same displacement during drilling, and the position of the leaking layer is determined according to the change of the annular pressure difference at two ends of the throttling component monitored underground.
As a preferable scheme, in the plugging operation in the step (6), the positions of the leaking layers and the plugging operation are tested from bottom to top for a plurality of leaking layers of the open hole section by activating the bypass valve for multiple times to close and open, so that the leaking layers are sequentially plugged one by one, and the plugging is more thorough.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A method for leak detection and plugging while drilling in a drilling process is characterized by comprising the following steps:
(1) acquiring basic data of drilling, the position of a leaking layer of an upper open hole section and drilling construction parameters, wherein the drilling construction parameters comprise: the discharge capacity and vertical pressure of a slurry pump are controlled;
(2) acquiring annular pressure difference at two ends of an underground throttling component and drilling fluid inlet and outlet flow or mud tank drilling fluid volume change data;
(3) judging whether leakage occurs according to the flow of the drilling fluid in and out or the drilling fluid quantity change condition of the mud tank;
if the leakage occurs underground, the following operation steps are carried out:
(4) determining the position of a leaking layer by the position of the underground throttling component and monitoring the change of annular pressure difference at two ends of the underground throttling component;
(5) after the leaking layer is determined, lifting the drilling tool to the position above the leaking layer, opening the bypass valve for multiple times to activate, injecting leaking stoppage slurry, and performing one-time leaking stoppage operation;
(6) after one-time plugging operation is finished, judging whether leakage exists or not:
if no loss exists, closing the bypass valve which is activated for many times, and continuing the drilling operation;
if leakage exists, the underground throttling component is lifted to the upper safe position of the leakage layer, slurry is circulated, and whether the leakage layer is blocked or not is judged according to annular pressure difference at two ends of the underground throttling component:
(61) if the leakage layer is not blocked, adjusting the formula of the leakage stopping slurry, and performing secondary leakage stopping operation until no leakage exists in the leakage layer;
(62) and (4) if the leaking layer is blocked, indicating that the leaking layer still exists in the upper well section, continuously repeating the steps (4) to (6) until the leaking stoppage is successful, closing the bypass valve activated for multiple times, and continuing the drilling operation.
2. The leak hunting and plugging method while drilling of claim 1, wherein: in the step (4): the method for determining the position of the leaking layer comprises the following steps:
if the annular pressure difference at the two ends of the underground throttling component is smaller than that when no leakage occurs, indicating that the leakage layer is below the throttling component in the drilling tool;
if the annular pressure difference at the two ends of the downhole throttling component is unchanged or within an error compared with that when no leakage occurs, the leakage layer is above the throttling component.
3. The method for leak detection and plugging while drilling as recited in claim 2, wherein: the relationship between the annular pressure difference and the leakage rate at two ends of the underground throttling component is as follows:
ΔP＝P1-P2＝(ρslurry composition-ρLiquid for treating urinary tract infection)glcosα+Kf(QDischarge capacity-QLeakage net)1.8≈Kf(QDischarge capacity-QLeakage net)1.8
In the formula: delta P-the differential pressure at two ends of the underground throttling component, and the unit is MPa; p1-downhole choke front pressure in MPa; p2-downhole choke back pressure in MPa; rhoSlurry compositionDrilling fluid density in g/cm3；ρLiquid for treating urinary tract infectionDensity of liquid in differential pressure sensor line in g/cm3(ii) a l-measuring point distance between two ends of the underground throttling component, wherein the unit is m; alpha-well angle in degrees; kf-coefficient of friction resistance; qDischarge capacity-mud pump displacement in L/s; qLeakage netLeak rate in L/s.
4. The leak hunting and plugging method while drilling of claim 1, wherein: in the step (4), the method for determining the loss position specifically includes the following steps:
a. when the annular pressure difference at two ends of the throttling component is suddenly reduced during actual drilling and the drilling fluid loss is monitored on the ground, the leaking layer can be judged to be at the bottom of the well;
b. when the leakage of the drilling fluid is monitored on the ground in the actual drilling process, and the annular pressure difference at two ends of the throttling component is not changed or is within the error, the leakage layer can be judged not to be positioned at the bottom of the well.
5. The leak hunting and plugging method while drilling according to claim 4, wherein the leak layer is not at the bottom of the well in two cases:
b1. the upper leaking layer begins to leak, the drilling tool is lifted to the position above the upper leaking layer at the moment, the circulation test is carried out according to the same discharge capacity during drilling, and whether the upper leaking layer begins to leak or not is judged according to the condition that the annular pressure difference at two ends of the throttling component is monitored underground;
b2. and (3) the upper open hole section does not drill a leaking layer, but the well leakage is caused by factors such as drilling fluid density, pump holding and the like, a drilling tool is lifted to the position above the suspected weak stratum by combining geological data so as to circulate at the same displacement during drilling, and the position of the leaking layer is determined according to the change of the annular pressure difference at two ends of the throttling component monitored underground.
6. The method for leak detection while drilling and plugging as recited in claim 1, wherein the step (5) of activating the bypass valve for multiple times is to activate the bypass valve for multiple times by means of RFID tag carrying signals or ball throwing, so that the adverse factor that large particles in plugging slurry cannot pass through a special downhole tool is eliminated in the process of plugging operation.
7. The leak-plugging and plugging method while drilling as recited in claim 6, wherein said special downhole tool comprises but is not limited to a screw, a directional MWD (measurement while drilling) tool, an LWD (logging while drilling) tool.
8. The method for leak detection and plugging while drilling as recited in claim 7, characterized in that in the plugging operation in the step (6), the positions of leak layers and the plugging operation are tested from bottom to top for a plurality of leak layers of the open hole section by activating the bypass valve for closing and opening for a plurality of times.
9. The leak-plugging while drilling method as recited in claim 1, wherein the basic data of the drilling well includes but is not limited to well depth, borehole diameter and geological stratification.
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| CN112211619A (en) * | 2020-11-19 | 2021-01-12 | 中国石油天然气集团有限公司 | Method for rapidly determining lost circulation position in long open hole section |
| CN113550712A (en) * | 2021-09-18 | 2021-10-26 | 德仕能源科技集团股份有限公司 | Natural gas well plugging treatment method |
| CN113803059A (en) * | 2021-08-02 | 2021-12-17 | 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 |
| CN113818800A (en) * | 2021-10-20 | 2021-12-21 | 中国地质大学（北京） | Emergency rescue drilling is along with boring water shutoff device |
| CN113898313A (en) * | 2021-10-13 | 2022-01-07 | 中石化石油工程技术服务有限公司 | Anti-collapse and anti-leaking construction method for shale gas horizontal well oil-based drilling fluid |
| CN117780337A (en) * | 2024-02-26 | 2024-03-29 | 中国石油大学(华东) | Method and device for identifying underground blockage |
| CN117888876A (en) * | 2024-03-15 | 2024-04-16 | 中国矿业大学 | Optical fiber sensing device and monitoring method for while-drilling parameters of screw drill |
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| CN112211619A (en) * | 2020-11-19 | 2021-01-12 | 中国石油天然气集团有限公司 | Method for rapidly determining lost circulation position in long open hole section |
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