CN111395980A - Method for solving sand blockage in casing of brine well - Google Patents
Method for solving sand blockage in casing of brine well Download PDFInfo
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- CN111395980A CN111395980A CN202010238934.4A CN202010238934A CN111395980A CN 111395980 A CN111395980 A CN 111395980A CN 202010238934 A CN202010238934 A CN 202010238934A CN 111395980 A CN111395980 A CN 111395980A
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- water
- well
- brine
- casing
- water injection
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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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sewage (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for solving sand blockage in a casing of a brine well, which comprises the following steps in sequence: 1) injecting 100m into a smooth water injection well3The water is returned from the water injection well, and the flow rate of the returned water is not less than 60m3H; 2) after 20 minutes, a groove building pump is used for injecting water into the brine returning well which is blocked by the sleeve and is horizontally communicated with the water injection well, and the flow is not less than 50m3And h, after at least 2 hours, the gravel in the casing is flushed into the dissolution cavity. The invention utilizes the principle that a certain amount of water can be injected when the underground dissolving cavity is large, a certain amount of water is injected into the water injection well, and under the condition that the water injection well can be injected with water in one direction for production, the water is reversely discharged from the blocked sleeve with large discharge capacity, so that gravel in the sleeve is scattered, at the moment, the brine-returning well is injected with water in a reverse direction, and the gravel in the sleeve sequentially enters the dissolving cavity under certain pressure, so that the aim of unblocking the brine well is fulfilled.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a method for solving sand blockage in a brine well casing.
Background
For a brine well mined by a water solution method, due to the fact that a large amount of settled sand exists in a brine well dissolving cavity, sand blockage in a casing pipe is caused due to the reasons that the settled sand is lifted up due to collapse of a top plate, backflow of water injection is caused due to sudden power failure, sand carrying amount of produced brine is large due to large flow and the like in the production process, and the brine well is a common underground accident.
After the casing is sand-blocked, the common solutions are a pressure-holding blowout method and a high-pressure-holding blowout method, but the pressure-holding blowout method can only inject water from a water injection well, return brine from a brine well, and the water injection flow of the brine well cannot exceed 4.5m3And h, otherwise, the blockage is removed again, namely the blockage removing success rate of the pressure-holding pressure-releasing spraying method and the high-pressure-holding method is low and is only about 25%, and meanwhile, the high-pressure-holding method needs equipment such as a fracturing truck and the like, and certain cost is generated. If the method cannot be successful, only well repairing equipment can be adopted for repairing, but the generated well repairing cost is higher, particularly when repairing operations such as casing milling, back-off, grinding milling and the like are needed, the cost is higher, and meanwhile, the normal production of the brine well is influenced due to the longer repairing period.
Therefore, it is an urgent need to solve the problem of the art to provide a method for solving sand blocking in a casing of a brine well with low cost and high success rate.
Disclosure of Invention
In view of the above, the invention provides a method for solving sand blockage in a casing of a brine well, which has low production cost and can greatly improve the blockage removal success rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for solving sand blocking in a brine well casing comprises the following steps in sequence:
1) injecting 100m into a smooth water injection well3The water is returned from the water injection well, and the flow rate of the returned water is not less than 60m3/h；
2) After 20 minutes, a groove building pump is used for injecting water into the brine returning well which is blocked by the sleeve and is horizontally communicated with the water injection well, and the flow is not less than 50m3And h, after at least 2 hours, the gravel in the casing is flushed into the dissolution cavity.
Further, the return flow rate in the step 1) is 70m3/h。
Further, the water injection flow rate in the step 2) is 60m3/h。
Furthermore, the water injection amount in the dissolving cavity is more than 50m3。
By adopting the scheme, the invention has the beneficial effects that:
utilize the principle that can pour into a certain amount of water into when the cavity is great in the pit, pour into a certain amount of water into in the water injection well, under the one-way water injection production that can be in the water injection well, water is from the intraductal big discharge capacity of the cover that blocks up and is reversed to make the intraductal grit of cover scatter, carry out reverse water injection to returning the steamed well this moment, make the intraductal grit of cover enter into the cavity in proper order under certain pressure, thereby reach the purpose that the steamed well deblocked.
Further, step 2) also includes: and (5) releasing the pressure of the water injection well.
Adopt the beneficial effect that above-mentioned further technical scheme produced to do, can avoid the underground pressure too high.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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 of the invention discloses a method for solving sand blockage in a casing of a brine well, which comprises the following steps in sequence:
1) injecting 100m into a smooth water injection well3The water is returned from the water injection well, and the flow rate of the returned water is not less than 60m3/h；
2) After 20 minutes, a groove building pump is used for injecting water into the brine returning well which is blocked by the sleeve and is horizontally communicated with the water injection well, and the flow is not less than 50m3And h, after at least 2 hours, the gravel in the casing is flushed into the dissolution cavity.
The invention utilizes the principle that a certain amount of water can be injected when the underground dissolving cavity is large, a certain amount of water is injected into the water injection well, and under the condition that the water injection well can be injected with water in one direction for production, the water is reversely discharged from the blocked sleeve with large discharge capacity, so that gravel in the sleeve is scattered, at the moment, the brine-returning well is injected with water in a reverse direction, and the gravel in the sleeve sequentially enters the dissolving cavity under certain pressure, so that the aim of unblocking the brine well is fulfilled.
Specifically, the return flow rate in the step 1) is 70m3/h。
Specifically, the water injection flow rate in the step 2) is 60m3/h。
Specifically, the water injection amount in the dissolving cavity is more than 50m3。
Specifically, the step 2) further comprises: and (5) releasing the pressure of the water injection well.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A method for solving sand blocking in a brine well casing is characterized by comprising the following steps in sequence:
1) injecting 100m into a smooth water injection well3The water is returned from the water injection well, and the flow rate of the returned water is not less than 60m3/h；
2) After 20 minutes, a groove building pump is used for injecting water into the brine returning well which is blocked by the sleeve and is horizontally communicated with the water injection well, and the flow is not less than 50m3And h, after at least 2 hours, the gravel in the casing is flushed into the dissolution cavity.
2. The method for solving sand blockage in the casing of the brine well as recited in claim 1, wherein the flow rate of the return flow in the step 1) is 70m3/h。
3. The method for solving the sand blockage in the casing of the brine well according to the claim 1, wherein the water injection flow rate in the step 2) is 60m3/h。
4. The method for solving sand blocking in the casing of the brine well as recited in claim 1, wherein the amount of water injected into the dissolution cavity is more than 50m3。
5. The method for solving sand blockage in the casing of the brine well according to claim 1, wherein the step 2) further comprises the following steps: and (5) releasing the pressure of the water injection well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010238934.4A CN111395980B (en) | 2020-03-30 | 2020-03-30 | Method for solving sand blockage in casing of brine well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010238934.4A CN111395980B (en) | 2020-03-30 | 2020-03-30 | Method for solving sand blockage in casing of brine well |
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| CN111395980A true CN111395980A (en) | 2020-07-10 |
| CN111395980B CN111395980B (en) | 2022-10-11 |
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Inventor after: Li Feng Inventor after: Sun Guangjian Inventor after: Xu Yanpei Inventor after: Zhang Wei Inventor after: Liu Xuanyuan Inventor after: Chen Weibin Inventor after: Zheng Youheng Inventor before: Li Feng Inventor before: Xu Yanpei Inventor before: Zhang Wei Inventor before: Liu Xuanyuan Inventor before: Chen Weibin Inventor before: Zheng Youheng |
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