CN111236868B - Plugging method for well drilling overflow water outlet channel - Google Patents
Plugging method for well drilling overflow water outlet channel Download PDFInfo
- Publication number
- CN111236868B CN111236868B CN202010196168.XA CN202010196168A CN111236868B CN 111236868 B CN111236868 B CN 111236868B CN 202010196168 A CN202010196168 A CN 202010196168A CN 111236868 B CN111236868 B CN 111236868B
- Authority
- CN
- China
- Prior art keywords
- drilling
- shaft
- overflow water
- outlet channel
- drilling fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- E21B21/003—Means for stopping loss of drilling fluid
Abstract
The invention relates to the technical field of petroleum drilling, in particular to a method for plugging an overflow water outlet channel of a drilling well, which comprises the steps of stopping drilling when the drilling well is drilled to an overflow water layer, closing a blowout preventer to read and record a pressure value of a vertical pressure gauge, calculating the required density of weighted drilling fluid according to the pressure value on the vertical pressure gauge, the vertical depth of a drilled shaft and the density of the drilling fluid in the shaft after the pressure is stable for more than 15 minutes, preparing 1.5 times of the volume of the shaft, adding weighted drilling fluid into the shaft for killing a well, pulling out a drilling tool, lowering a 50-70-column optical drilling rod to the overflow water layer, injecting cement slurry into the shaft, pulling out a 10-column optical drilling rod, extruding the drilling fluid into the overflow water outlet channel of the overflow water layer with a certain displacement, removing a plug after the cement slurry is solidified for 24 hours after closing the well, recovering the drilling by using the drilling fluid in the drilling shaft, and effectively reducing the density of the subsequent construction drilling fluid, the method reduces the processing cost, avoids complex risks of high-density drilling underground accidents, has strong applicability to field production, and is worthy of popularization and application.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a plugging method for a drilling overflow water outlet channel.
Background
The oil well of Changqing oil field is developed through first injection and then extraction, and has great amount of water injecting wells with long main water injecting layer4+5And length6Layer, long-term mass water injection causes disorder of extended group pressure system, in the northern Shaanxi area, drilling is taken as an example, the well is drilled to the long4+5And length6In the stratum, overflow is often generated, the overflow amount is ten times per hour, the overflow matter mainly comprises water, oil, associated gas and the like, the drilling is continued after the density of the drilling fluid is improved to balance the pressure of a water injection stratum in the prior art, and the well killing density is generally 1.50g/cm3Above, the density of partial wells is as high as 1.90g/cm3On the left and right sides, drilling fluid high density causes drilling speed to be slow, equipment is loaded, well leakage is induced to occur underground complicatedly, and a large number of wells are scrapped each year due to the reason. In recent years the oilfield development horizon has been extended deep, e.g. long7The bearing equivalent density of a target layer of a compact oil development well is only 1.20g/cm3Left and right, the existence of the weak pressure-bearing stratum at the lower part causes that the overflow and downward leakage well is difficult to be safely constructed. In view of the above, a safe, reliable and economical method for controlling the overflow of the overflow channel is urgently needed.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a plugging method for a well drilling overflow water outlet channel, and particularly provides a method for controlling overflow water of the overflow water outlet channel, which has the characteristics of simplicity, reliability, safety and high efficiency and is suitable for being used in a construction site.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a plugging method for a drilling overflow water outlet channel comprises the following steps
The method comprises the following steps: starting drilling on the geological formation where drilling is desired;
step two: on the basis of the step one, when drilling to an overflow water layer, stopping drilling;
step three: on the basis of the second step, closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, after the pressure is stabilized for more than 15 minutes, calculating the required weighted drilling fluid density according to the pressure value on the vertical pressure gauge, the vertical depth of the drilled shaft and the drilling fluid density in the shaft, and preparing weighted drilling fluid with the volume of the shaft being 1.2-1.5 times that of the shaft to be throttled and injected into the shaft for killing the well;
step four: on the basis of the third step, the drilling tool is lifted out, 50-70 columns of optical drilling rods are put down to the overflow water level, cement slurry is injected into the shaft, then 10 columns of optical drilling rods are lifted out, and cement slurry with certain discharge capacity is extruded into an overflow water outlet channel of the overflow water level;
step five: and on the basis of the fourth step, the well is closed, the setting is waited for 24 hours, then the plug is removed, and the drilling is recovered by using the drilling fluid in the drilling shaft in the second step.
The overflow water layer in the second step and the fourth step is the geological formation length4+5Or long6Formation horizon when the formation overflows with water.
The method for injecting cement slurry into the shaft in the fourth step is to inject 8-10 square of cement slurry with the density not lower than 1.85g/cm into the shaft3The cement slurry of (1).
The method for injecting cement slurry into the shaft in the fourth step is to inject 9-square density of 1.85g/cm into the shaft3The cement slurry of (1).
The method for extruding the cement paste with a certain discharge capacity into the overflow water outlet channel at the overflow water outlet layer position is to extrude 3-5 square cement paste into the overflow water outlet channel at the overflow water outlet layer position with the discharge capacity of 8-12L/s.
The method for extruding the cement paste with a certain discharge capacity into the overflow water outlet channel at the overflow water outlet level is to extrude the cement paste with a discharge capacity of 10L/s into the overflow water outlet channel at the overflow water outlet level at 4 sides.
The method for calculating the required weighted drilling fluid density in the third step comprises
The weighted drilling fluid has a density of rhoyThe calculation formula is as follows
ρmThe density of the drilling fluid in the wellbore,
Ρvertical compressionThe pressure value on the vertical pressure gauge,
Ηvertical depthThe vertical depth of the drilled shaft,
ρethe range of the additional value is 0.05-0.1g/cm3。
The added value rhoeIs 0.05g/cm3。
And in the third step, the prepared shaft volume is 1.5 times that of the weighted drilling fluid, and the drilling fluid is throttled and injected into the shaft to kill the well.
The invention has the beneficial effects that:
compared with the prior art, the invention stops drilling when drilling to the overflow water layer, closes the blowout preventer to read and record the pressure value of the vertical pressure gauge, calculates the required weighted drilling fluid density according to the pressure value on the vertical pressure gauge, the vertical depth of the drilled shaft and the drilling fluid density in the shaft after the pressure is stable for more than 15 minutes, prepares the 1.5 times of weighted drilling fluid for injecting into the shaft for killing well, starts the drilling tool to lower a 50-70-column optical drilling rod to the overflow water layer, injects the drilling fluid into the shaft, then starts a 10-column optical drilling rod, adopts the cement slurry with certain displacement to extrude into the overflow water channel of the overflow water layer, closes the well and waits for setting for 24 hours, and uses the drilling fluid in the drilling shaft to recover the drilling, thereby effectively reducing the construction density of the subsequent drilling fluid, avoiding the treatment cost and avoiding the complex risk of accidents under the high-density drilling well, has strong applicability to field production and is worth popularizing and applying.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
Example 1:
referring to fig. 1, which is a schematic structural view of embodiment 1 of the present invention, a method for plugging a drilling overflow water outlet channel includes the following steps
The method comprises the following steps: starting drilling on the geological formation where drilling is desired;
step two: on the basis of the step one, when drilling to an overflow water layer, stopping drilling;
step three: on the basis of the second step, closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, after the pressure is stabilized for more than 15 minutes, calculating the required weighted drilling fluid density according to the pressure value on the vertical pressure gauge, the vertical depth of the drilled shaft and the drilling fluid density in the shaft, and preparing weighted drilling fluid with the volume of the shaft being 1.2-1.5 times that of the shaft to be throttled and injected into the shaft for killing the well;
step four: on the basis of the third step, the drilling tool is lifted out, 50-70 columns of optical drilling rods are put down to the overflow water level, cement slurry is injected into the shaft, then 10 columns of optical drilling rods are lifted out, and cement slurry with certain discharge capacity is extruded into an overflow water outlet channel of the overflow water level;
step five: and on the basis of the fourth step, the well is closed, the setting is waited for 24 hours, then the plug is removed, and the drilling is recovered by using the drilling fluid in the drilling shaft in the second step.
By the method, after the overflow water outlet channel is blocked, normal-density drilling fluid can be used for drilling the residual well section, so that the processing cost is effectively reduced, the complex risk of underground accidents of high-density drilling is avoided, the economic value is good, and the method is very worthy of popularization and application.
Example 2:
a plugging method for a drilling overflow water outlet channel comprises the following steps
The method comprises the following steps: starting drilling on the geological formation where drilling is desired;
step two: on the basis of the step one, when drilling to the geological formation length4+5Or long6Stopping drilling when the stratum overflows to form a stratum layer when water flows out;
step three: on the basis of the second step, closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, after the pressure is stabilized for more than 15 minutes, calculating the required density of the weighted drilling fluid according to the pressure value on the vertical pressure gauge, the vertical depth of the drilled shaft and the density of the drilling fluid in the shaft, and preparing the weighted drilling fluid with the volume 1.5 times of the shaft to be throttled and injected into the shaft for killing the well;
the method for calculating the required weighted drilling fluid density comprises the following steps:
the weighted drilling fluid has a density of rhoyThe calculation formula is as follows
ρmThe density of the drilling fluid in the wellbore,
Ρvertical compressionThe pressure value on the vertical pressure gauge,
Ηvertical depthThe vertical depth of the drilled shaft,
ρethe range of the additional value is 0.05-0.1g/cm3；
Usually the added value ρ in actual calculationeIs selected to be 0.05g/cm3；
Step four: on the basis of the third step, the drilling tool is pulled out, and a 50-70 column optical drilling rod is put into the position until the geological layer is long4+5Or long6Injecting 8-10 square density not less than 1.85g/cm into the shaft at the stratum layer position when the stratum overflows to produce water3Then, taking out the 10-column light drill rod, and extruding 3-5 square cement slurry into an overflow water outlet channel at an overflow water outlet layer position by adopting the discharge capacity of 8-12L/s;
in actual construction, the drilling tool is lifted out, and the smooth drilling rod is lowered to the length of the geological layer4+5Or long6Injecting 9-square density of 1.85g/cm into a shaft at the stratum horizon when the stratum overflows to produce water3Then the cement slurry is taken out of the 10-column drilling tool, and the cement slurry is extruded into an overflow water outlet channel of the overflow water layer position by adopting the discharge capacity of 10L/s and 4 sides;
step five: and on the basis of the fourth step, the well is closed, the setting is waited for 24 hours, then the plug is removed, and the drilling is recovered by using the drilling fluid in the drilling shaft in the second step.
By the method, drilling is recovered by using the drilling fluid in the drilling shaft, so that the processing cost is reduced, and the complex risk of high-density drilling underground accidents is avoided.
Example 3:
taking 32 wells in valley of northern Shaanxi area as an example, the designed well depth is 2471 m, and the target layer is 10 groups long. The engineering design density is 1.16g/cm3When the drilling fluid is drilled to reach the well depth of 1810 meters and the stratum is 4+5 long, the drilling fluid overflows, the overflow amount is 28 square/hour, and an overflow water outlet channel is plugged by adopting the method.
The method comprises the following implementation steps:
firstly, adopting engineering design to make density be 1.16g/cm3When the drilling fluid is drilled to reach the well depth of 1810 meters and the stratum is 4+5 long, the pump outlet is stopped to stop flowing, overflow water is produced, and the drilling is stopped when the overflow quantity is 28 square meters per hour;
closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, and calculating the required density of the weighted drilling fluid according to the pressure value on the vertical pressure gauge, the drilled vertical depth of the shaft and the density of the drilling fluid in the shaft after the pressure is stabilized for more than 15 minutes;
the method for calculating the required weighted drilling fluid density comprises the following steps:
the weighted drilling fluid has a density of rhoyThe calculation formula is as follows
ρmThe density of the drilling fluid in the wellbore,
Ρvertical compressionThe pressure value on the vertical pressure gauge,
Ηvertical depthThe vertical depth of the drilled shaft,
ρethe range of the additional value is 0.05-0.1g/cm3；
Usually the added value ρ in actual calculationeIs selected to be 0.05g/cm3；
The well killing fluid is throttled and injected into the well shaft for killing the well shaft by preparing 1.5 times of the well shaft volume after calculationAnd the density of the prepared product is 1.60g/cm after calculation3And (4) weighting the well killing of the drilling fluid.
Thirdly, the drilling tool is taken out, a 60-column light drill rod is put in to 1800 m, and 10-square density 1.85g/cm is injected3And (3) cement paste is taken out of the 10-column optical drilling rod, and 3.5 square cement paste is extruded into an overflow water outlet channel at the 1800 m overflow water outlet layer position by adopting the discharge capacity of 8L/s.
Fourthly, cleaning the plug after closing the well and waiting for setting for 24 hours, wherein the using density is 1.16g/cm3And (4) drilling fluid resumes drilling.
The results of use:
in a valley 32 well, after overflow water outlet occurs, a method of plugging an overflow water outlet channel by cement is adopted to successfully prevent overflow from invading a shaft, and the rest well section adopts a density of 1.16g/cm3The drilling fluid is drilled to the completion of drilling, and compared with the similar well, the disposal cost is reduced by 35 percent.
Example 4:
taking Saiping 12-16 wells in northern Shaanxi area as an example, the designed well depth is 3852 meters, and the target layer is 7 groups long. The engineering design density is 1.20g/cm3The drilling fluid is drilled to the well depth of 1989 m and the stratum is long6When the water is overflowing, the overflowing amount is 18 square/hour, and the method is adopted to plug the overflowing water outlet channel.
The method comprises the following implementation steps:
firstly, the engineering design density is 1.20g/cm3When the drilling fluid drills to the well depth of 1989 m and the stratum is 6 m long, water overflows, the overflow amount is 18 square/hour, and the drilling is stopped.
Closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, and calculating the required density of the weighted drilling fluid according to the pressure value on the vertical pressure gauge, the drilled vertical depth of the shaft and the density of the drilling fluid in the shaft after the pressure is stabilized for more than 15 minutes;
the method for calculating the required weighted drilling fluid density comprises the following steps:
the weighted drilling fluid has a density of rhoyThe calculation formula is as follows
ρmThe density of the drilling fluid in the wellbore,
Ρvertical compressionThe pressure value on the vertical pressure gauge,
Ηvertical depthThe vertical depth of the drilled shaft,
ρethe range of the additional value is 0.05-0.1g/cm3；
Usually the added value ρ in actual calculationeIs selected to be 0.05g/cm3；
The well killing fluid is throttled and injected into the well shaft for killing the well by preparing the well shaft with the volume 1.5 times that of the well shaft after calculation, and the prepared density is 1.50g/cm after calculation3And (4) weighting the well killing of the drilling fluid.
Thirdly, the drilling tool is lifted out, a 70-column light drill rod is put in to 1980 m, and the 10-square density is injected to 1.85g/cm3And (3) cement paste is taken out of the 10-column light drill pipe, and the cement paste is squeezed into a 4-square cement paste to enter an overflow water outlet channel at an overflow water layer position of 1980 m by adopting the displacement of 10L/s.
Fourthly, cleaning the plug after closing the well and waiting for setting for 24 hours, wherein the using density is 1.20g/cm3And (4) drilling fluid resumes drilling.
The results of use:
plugging 12-16 wells, adopting a method of plugging an overflow water outlet channel by cement after overflow water outlet happens, successfully preventing overflow objects from invading a shaft, and adopting the density of 1.20g/cm for the rest well sections3The drilling fluid is drilled to the completion of drilling, and compared with the similar well, the disposal cost is reduced by 40 percent.
While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention is within the scope of the claims.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Technical solutions between various embodiments may be combined with each other, but must be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Claims (9)
1. A plugging method for a drilling overflow water outlet channel is characterized by comprising the following steps: comprises the following steps
The method comprises the following steps: starting drilling on the geological formation where drilling is desired;
step two: on the basis of the step one, when drilling to an overflow water layer, stopping drilling;
step three: on the basis of the second step, closing the blowout preventer, reading and recording the pressure value of the vertical pressure gauge, after the pressure is stabilized for more than 15 minutes, calculating the required weighted drilling fluid density according to the pressure value on the vertical pressure gauge, the vertical depth of the drilled shaft and the drilling fluid density in the shaft, and preparing weighted drilling fluid with the volume of the shaft being 1.2-1.5 times that of the shaft to be throttled and injected into the shaft for killing the well;
step four: on the basis of the third step, the drilling tool is lifted out, 50-70 columns of optical drilling rods are put down to the overflow water level, cement slurry is injected into the shaft, then 10 columns of optical drilling rods are lifted out, and cement slurry with certain discharge capacity is extruded into an overflow water outlet channel of the overflow water level;
step five: and on the basis of the fourth step, the well is closed, the setting is waited for 24 hours, then the plug is removed, and the drilling is recovered by using the drilling fluid in the drilling shaft in the second step.
2. The method of claim 1 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the overflow water layer in the second step and the fourth step is the geological formation length4+5Or long6Formation horizon when the formation overflows with water.
3. The method of claim 1 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: what is needed isThe method for injecting cement slurry into the shaft in the fourth step is to inject 8-10 square of cement slurry with the density not lower than 1.85g/cm into the shaft3The cement slurry of (1).
4. The method of claim 3 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the method for injecting cement slurry into the shaft in the fourth step is to inject 9-square density of 1.85g/cm into the shaft3The cement slurry of (1).
5. The method of claim 1 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the method for extruding the cement paste with a certain discharge capacity into the overflow water outlet channel at the overflow water outlet layer position is to extrude 3-5 square cement paste into the overflow water outlet channel at the overflow water outlet layer position with the discharge capacity of 8-12L/s.
6. The method of claim 5 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the method for extruding the cement paste with a certain discharge capacity into the overflow water outlet channel at the overflow water outlet level is to extrude the cement paste with a discharge capacity of 10L/s into the overflow water outlet channel at the overflow water outlet level at 4 sides.
7. The method of claim 1 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the method for calculating the required weighted drilling fluid density in the third step comprises
The weighted drilling fluid has a density of rhoyThe calculation formula is as follows
ρmThe density of the drilling fluid in the wellbore,
the pressure value on the vertical pressure table,
a vertical depth of Η, a vertical depth of a wellbore drilled up,
ρerange of added value, added valueIs 0.05-0.1g/cm3。
8. The method of claim 7 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: the added value rhoeIs 0.05g/cm3。
9. The method of claim 1 for plugging a drill overflow outlet channel, wherein the method comprises the steps of: and in the third step, the prepared shaft volume is 1.5 times that of the weighted drilling fluid, and the drilling fluid is throttled and injected into the shaft to kill the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196168.XA CN111236868B (en) | 2020-03-19 | 2020-03-19 | Plugging method for well drilling overflow water outlet channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010196168.XA CN111236868B (en) | 2020-03-19 | 2020-03-19 | Plugging method for well drilling overflow water outlet channel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111236868A CN111236868A (en) | 2020-06-05 |
| CN111236868B true CN111236868B (en) | 2021-11-19 |
Family
ID=70866407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010196168.XA Active CN111236868B (en) | 2020-03-19 | 2020-03-19 | Plugging method for well drilling overflow water outlet channel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111236868B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7090036B2 (en) * | 2001-02-15 | 2006-08-15 | Deboer Luc | System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions |
| CN102382632B (en) * | 2010-09-03 | 2014-12-03 | 中国石油化工股份有限公司 | Pretreating agent preventing leaking stoppage from being diluted by formation water and preparation method and application thereof |
| CN102251752A (en) * | 2011-06-24 | 2011-11-23 | 中国石油集团川庆钻探工程有限公司 | Petroleum drilling decompression first and then pressurization well control process |
| CN104212421B (en) * | 2013-06-05 | 2017-11-10 | 中国石油天然气股份有限公司 | It is a kind of to block the anti-gas cut agent in crack and preparation method with brill |
| US9816336B2 (en) * | 2014-07-08 | 2017-11-14 | Halliburton Energy Services, Inc. | Real time conformance |
| CN109630047A (en) * | 2018-12-07 | 2019-04-16 | 中国石油大学(华东) | Five steps for no safe pressure window fractured reservoir kill-job push back method and equipment |
-
2020
- 2020-03-19 CN CN202010196168.XA patent/CN111236868B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111236868A (en) | 2020-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106930713B (en) | Casing pipe damage repairing method | |
| CN106522928B (en) | Well testing method for unstable pressure drop of well logging head by stopping pump after acidizing and fracturing | |
| US20220098955A1 (en) | Method for filling oil-gas well of fractured oil-gas reservoir with isolation particles to reduce water and increase oil production | |
| DE60316433T2 (en) | METHOD FOR DRILLING AND COMPLETING INJECTION HOUNDS | |
| US11136865B2 (en) | Integrated construction method of fracturing and tertiary oil recovery for low-permeability reservoir | |
| CN201843600U (en) | SAGD (Steam Assisted Gravity Drainage) mechanical lifting circulating preheating equipment | |
| CN108661613B (en) | Method for increasing injection of water injection development oil reservoir | |
| RU2304710C1 (en) | Well bottom zone treatment process | |
| CN104653164B (en) | A kind of low pressure bottom water reservoir oil well control blockage method for increasing | |
| CN204703876U (en) | A kind of bridge-type concentric separated-injection tubing string | |
| CN109973059B (en) | Rapid analysis method for gas injection mechanism of fracture-cavity oil reservoir | |
| CN101050699A (en) | Method for obtaining thick oil layer vertical permeability using same layer vertical interference test well and test tubular pole | |
| CN111236868B (en) | Plugging method for well drilling overflow water outlet channel | |
| CN103912247B (en) | A kind of multistage slug Technology of gas well horizontal well | |
| CN110043224B (en) | Oil well shaft blockage removing method | |
| CN100497881C (en) | Injection system for eliminating sucking pressure as coming out of hole | |
| CN108729887B (en) | Sand prevention process for viscous membrane stable gravel packing layer | |
| RU2418942C1 (en) | Procedure for well development | |
| CN111535747B (en) | Method for preventing leakage of casing under drilling narrow window | |
| Tipura et al. | Increasing oil recovery on the grane field with challenging PWRI | |
| CN109403957B (en) | High-pressure formation pressure acquisition method | |
| CN113250653A (en) | Acidification method of water injection well | |
| CN216197953U (en) | Combined drilling tool structure for multi-stage powder taking pipe to salvage rock powder in hole | |
| CN115680584B (en) | Quick prediction method for well closing casing pressure of overflow medium for injecting water into adjacent well | |
| RU2710050C1 (en) | Method of development of complex deposits with low reservoir pressure and temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |