CN114922564A - Withdrawing type well washing process for horizontal well in salt lake region - Google Patents
Withdrawing type well washing process for horizontal well in salt lake region Download PDFInfo
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- CN114922564A CN114922564A CN202210565521.6A CN202210565521A CN114922564A CN 114922564 A CN114922564 A CN 114922564A CN 202210565521 A CN202210565521 A CN 202210565521A CN 114922564 A CN114922564 A CN 114922564A
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- well
- horizontal well
- drill bit
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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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
Abstract
The application relates to an exiting type well washing process for a horizontal well in a salt lake area, which comprises the following steps: s1, drilling of the horizontal well: drilling in a halogen storage layer at the lower part of the salt lake until a horizontal well is formed, and enabling the tail end of the horizontal well to be communicated with an existing vertical halogen extraction well; s2, adjusting the position of a submerged halogen pump in the halogen extraction well; and S3, washing the horizontal well. The application has the effect of improving the single-well brine production.
Description
Technical Field
The application relates to the field of brine extraction technology, in particular to a horizontal well exit type well flushing process in a salt lake region.
Background
China is the biggest potassium fertilizer consuming country in the world, and potassium salt is one of seven major and scarce mineral products in China and becomes an important strategic resource for guaranteeing national food safety. The geological reserve of KCl in China is about 9.9 hundred million tons, mainly liquid brine mine is used, and potassium salt is produced mainly by collecting underground brine of a salt lake.
At present, one of the forms of salt lake brine mining engineering in China is well mining, the well mining technology of brine mainly aims at deep brine or a deep brine layer below a salt lake surface salt rock layer, and the method is widely applied to the aspects of extracting bromine in coastal areas and mining underground deep brine in developed areas of salt manufacturing industry due to simple, convenient and quick construction. But the problem of lower single-well brine production exists at present.
Disclosure of Invention
In order to improve the single-well brine recovery amount, the application provides an exit type well washing process for a horizontal well in a salt lake region.
The withdrawing type well washing process for the horizontal well in the salt lake area adopts the following technical scheme:
an exit type well washing process for a horizontal well in a salt lake region comprises the following steps:
s1, drilling a horizontal well: drilling in a halogen storage layer at the lower part of the salt lake until a horizontal well is formed, and enabling the tail end of the horizontal well to be communicated with an existing vertical halogen extraction well;
s2, adjusting the position of a submerged halogen pump in the halogen extraction well;
and S3, washing the horizontal well.
By adopting the technical scheme, the horizontal well is formed by drilling the brine storage layer at the lower part of the salt lake, and the formed horizontal well is communicated with the existing brine collecting well, so that the newly formed horizontal well increases the brine collecting area and is convenient for improving the brine collecting amount of a single well.
Preferably, the drilling of the horizontal well is: the horizontal directional drilling machine is used for drilling a horizontal well and is connected with a slurry pump, circulating slurry is injected into a drill bit through the slurry pump in the drilling process of the drill bit of the horizontal directional drilling machine, a plurality of slurry outlet holes are formed in the drill bit, and the slurry is sprayed out of the slurry outlet holes of the drill bit.
By adopting the technical scheme, in the process of drilling a horizontal well by using the horizontal directional drilling machine, a large amount of circulating mud is pumped into the drill bit through the mud pump, and in the process of screwing the drill bit, the circulating mud is sprayed out from the mud outlet of the drill bit, so that a certain lubricating effect is achieved on the drill bit.
Preferably, the adjustment of the position of the submerged halogen pump in the brine production well: and moving the position of the submerged halogen pump in the halogen extracting well to enable the water inlet of the submerged halogen pump to be flush with or lower than the position where the halogen extracting well and the horizontal well are communicated, and modulating the halogen output of the submerged halogen pump to the maximum by using a frequency conversion cabinet.
By adopting the technical scheme, in the process of drilling the horizontal well, the circulating slurry sprayed out of the drill bit can possibly enter the brine extraction well, so that the position of the water inlet of the brine extraction pump is flush with or lower than the position where the brine extraction well is communicated with the horizontal well, and the circulating slurry can be pumped out better.
Preferably, the well washing of the horizontal well comprises the following steps:
s3-1, injecting clean saturated brine into the horizontal well;
s3-2, withdrawing the drill rod;
s3-3, operating the submerged halogen pump.
By adopting the technical scheme, in the process of drilling the horizontal well, the mud sprayed by the drill bit can be retained in the horizontal well and the brine extracting well, and at the moment, clean and saturated brine is injected into the horizontal well, and the mud is pumped out through the brine submerging pump, so that the horizontal well and the brine extracting well are conveniently washed, the gap of a brine storage layer is dredged, and better brine extraction is facilitated.
Preferably, the injection of clean saturated brine into the horizontal well: when the drilling construction of the horizontal well is finished, the whole set of drilling tools including the drill bit and the plurality of drill rods is retained in the horizontal well, clean saturated brine is injected into the drill bit by using a slurry pump, and the drill bit is rotated and retracted at the same time.
By adopting the technical scheme, clean saturated brine is pumped into the drill bit through the mud pump, and then the brine is sprayed out from the mud outlet hole of the drill bit, so that the mud in the horizontal well and the brine extraction well can be cleaned, and the brine can be injected without installing other power equipment; in addition, the abundant local brine is used as the flushing liquid according to local conditions.
Preferably, the retraction of the drill rod is: the horizontal directional drilling machine comprises a plurality of drill rods which are connected pairwise, in the process of withdrawing the drill bit, the drill bit is withdrawn by one drill rod at a time, then the drill bit is controlled to slowly advance by the distance of one drill rod, the drill bit is always kept in a brine spraying state, and the process is repeated repeatedly; then retracting the length of one drill bit again, and retracting and pushing the drill bit repeatedly; the above operation is repeated until the drill bit and all drill rods are disengaged from the horizontal well.
By adopting the technical scheme, the well wall of the horizontal well can be well cleaned by spraying water through reciprocating retraction and propulsion of the drill rod and the drill bit.
Preferably, after the length of one drill rod is withdrawn each time, the drill bit is controlled to stop rotating and spraying water, and the drill rod closest to the horizontal directional drilling machine body is removed.
By adopting the technical scheme, after the drill rod is withdrawn, the useless drill rod is disassembled, so that the space is saved.
Preferably, the operation of the latent halogen pump is: and after the well washing work on the same day is finished, continuing to keep the operation of the maximum power of the submerged halogen pump until the brine pumped from the brine extraction well is clear from turbidity, and then finishing pumping water.
By adopting the technical scheme, the brine mixed with the slurry in the brine extracting well is pumped out until the pumped brine is kept clean all the time, so that the horizontal well and the brine extracting well are cleaned.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the area for producing brine is increased, and the brine production amount of a single well is convenient to improve;
2. need not to accomplish the injection of brine through installing other power equipment, and according to local conditions, utilized local abundant brine as the flush fluid, can be better wash horizontal well and adopt the brine well.
Drawings
FIG. 1 is a schematic diagram of an overall flow of a well-flushing process embodied in an embodiment of the present application.
Fig. 2 is a schematic flow diagram of a well flushing process embodying a horizontal well in an embodiment of the present disclosure.
Detailed Description
The present application is described in further detail below with reference to fig. 1-2.
The embodiment of the application discloses an exit type well washing process for a horizontal well in a salt lake area. Referring to fig. 1 and 2, the withdrawing type well flushing process of the horizontal well in the salt lake area comprises drilling of the horizontal well, adjustment of the position of a submerged halogen pump in a halogen production well and well flushing of the horizontal well.
S1, drilling a horizontal well: and drilling in a lower halogen storage layer of the salt lake by using a horizontal directional drilling machine so as to form a horizontal well. The tail end of the horizontal well formed by drilling is communicated with the existing vertical brine extraction well. The horizontal directional drilling machine is usually connected with a slurry pump, a large amount of circulating slurry is injected into a drill bit through the slurry pump in the drilling process of the drill bit of the horizontal directional drilling machine, and the drill bit is provided with a plurality of radial slurry outlet holes, so that a large amount of slurry is sprayed out of the slurry outlet holes of the drill bit, and the drill bit is lubricated.
However, because the brine storage layer is of a special porous structure, a large amount of circulating slurry injected in the drilling process of the horizontal directional drilling machine is leaked, so that the drilling speed is influenced, and a large touch loss and even bit sticking and other safety accidents are caused to a drill bit. In order to reduce the occurrence of large losses of the circulating mud, the consistency of the circulating mud needs to be increased to improve the retaining capacity of the circulating mud. Therefore, the situation that the drill is stuck and held is reduced, the torque is reduced, and the smooth drilling of the drill bit is ensured.
S2, adjusting the position of the submerged halogen pump in the halogen extraction well: and adjusting the position of the brine submersible pump in the brine recovery well to enable the water inlet of the brine submersible pump to be positioned at the communication position of the brine recovery well and the horizontal well, or to enable the water inlet of the brine submersible pump to be slightly lower than the communication position of the brine recovery well and the horizontal well. The frequency conversion cabinet is used for modulating the brine discharge amount of the brine submersible pump to the maximum, and the purpose is to pump out the slurry flowing into the brine recovery well from the horizontal well to the maximum.
In the drilling process of the horizontal well, circulating mud sprayed out of the drill bit can be retained in the horizontal well and the brine extracting well, so that the mud can block the pores of the brine storage layer and block underground water circulation. In order to solve the above problems, a well washing of the horizontal well is required.
S3, washing the horizontal well: the method comprises the steps of injecting clean saturated brine into a horizontal well, withdrawing a drill rod, operating a submerged brine pump and circularly washing the well. And in the well washing process of the horizontal well, the submerged halogen pump is always in an operating state.
S3-1, injecting clean saturated brine into the horizontal well: when the drilling construction of the horizontal well is finished, the whole set of drilling tools including the drill bit and the plurality of drill rods is retained in the horizontal well, wherein the position of the drill bit is located at the connecting position of the tail end of the horizontal well and the brine extraction well. At the moment, clean saturated brine is injected into the drill bit by using a slurry pump, the drilling machine is started, the drill bit is rotated at a high speed and is slowly withdrawn, and the injected clean brine is radially injected from a mud outlet hole of the drill bit, so that the wall of the horizontal well is flushed.
S3-2, withdrawing the drill rod: the horizontal directional drilling machine comprises a plurality of drill rods which are connected pairwise, and the drill rods are withdrawn one at a time in the process of withdrawing the drill bits. And then the drill bit is controlled to slowly advance for a distance of one drill rod, the drill bit is always kept in a brine spraying state, and the drill bit is withdrawn and pushed in a reciprocating mode for three times respectively, and the time is 30 min.
And after the third time of withdrawal, controlling the drill bit to stop rotating and spraying water, and removing the drill rod closest to the horizontal directional drilling machine body. And then the length of one drill bit is withdrawn again, and the drill bit is withdrawn and pushed back and forth three times respectively. And repeating the operation until the drill bit and all drill rods are separated from the horizontal well.
S3-3, continuing the operation of the submerged halogen pump: and after the well washing work is finished, continuously keeping the maximum power operation of the submerged halogen pump for a period of time until the brine pumped from the brine extraction well is clear from turbidity, and then finishing pumping water.
S3-4, circulating well washing: and (3) continuing the well washing work of one horizontal well for several days, circularly reciprocating the whole well washing process until the whole horizontal well is cleaned, keeping the brine pumped finally clean all the time, and finishing the well washing work.
After the well washing process is finished, a large amount of fine sand is found in the brine conveying channel for draining water, and the fine sand is not added when slurry is prepared, so that the fine sand pumped out along with brine originally exists in the brine storage layer and is filled in the pores of the brine storage layer, and after the fine sand is drained, the porosity of the brine storage layer is increased, underground water is enabled to circulate more smoothly, and the permeation speed of the brine storage layer is increased.
After the well washing is finished, the water yield of the brine extraction well is obviously increased through a water pumping test, which shows that the well washing process has a good cleaning effect on slurry generated in the construction process of the horizontal well and dredges the brine storage layer to a certain extent.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. An exiting type well washing process for a horizontal well in a salt lake area is characterized by comprising the following steps:
s1, drilling of the horizontal well: drilling in a halogen storage layer at the lower part of the salt lake until a horizontal well is formed, and enabling the tail end of the horizontal well to be communicated with an existing vertical halogen extraction well;
s2, adjusting the position of a submerged halogen pump in the halogen extraction well;
and S3, washing the horizontal well.
2. The withdrawing type well washing process for the horizontal well in the salt lake region according to claim 1, characterized in that the horizontal well is drilled by: the horizontal directional drilling machine is used for drilling a horizontal well and is connected with a slurry pump, circulating slurry is injected into a drill bit through the slurry pump in the drilling process of the drill bit of the horizontal directional drilling machine, a plurality of slurry outlet holes are formed in the drill bit, and the slurry is sprayed out of the slurry outlet holes of the drill bit.
3. The exiting well flushing process for the horizontal well in the salt lake region according to claim 1 is characterized in that adjustment of the position of a submerged halogen pump in a halogen recovery well: and moving the position of the submerged halogen pump in the halogen extraction well to enable the water inlet of the submerged halogen pump to be flush with or lower than the position where the halogen extraction well is communicated with the horizontal well, and modulating the halogen output of the submerged halogen pump to the maximum by using a frequency conversion cabinet.
4. The withdrawing type well flushing process for the horizontal well in the salt lake region according to claim 2, wherein the well flushing of the horizontal well comprises the following steps:
s3-1, injecting clean saturated brine into the horizontal well;
s3-2, withdrawing the drill rod;
and S3-3, continuing the operation of the latent halogen pump.
5. The withdrawing type well washing process for the horizontal well in the salt lake region according to claim 4, wherein clean saturated brine is injected into the horizontal well: when the drilling construction of the horizontal well is finished, the whole set of drilling tools including the drill bit and the plurality of drill rods is retained in the horizontal well, clean saturated brine is injected into the drill bit by using a slurry pump, and the drill bit is rotated and retracted at the same time.
6. The salt lake area horizontal well withdrawing type well washing process is characterized in that the withdrawal of the drill rod is as follows: the horizontal directional drilling machine comprises a plurality of drill rods which are connected pairwise, in the process of withdrawing the drill bit, the drill bit is withdrawn by one drill rod at a time, then the drill bit is controlled to slowly advance by the distance of one drill rod, the drill bit is always kept in a brine spraying state, and the process is repeated repeatedly; then retracting the length of one drill bit again, and retracting and pushing the drill bit repeatedly; and repeating the operation until the drill bit and all drill rods are separated from the horizontal well.
7. The withdrawing type well washing process for the horizontal well in the salt lake area is characterized in that after the length of one drill rod is withdrawn each time, the drill bit is controlled to stop rotating and spraying water, and the drill rod closest to the horizontal directional drilling machine body is removed.
8. The withdrawing type well flushing process for the horizontal well in the salt lake region according to claim 6, wherein the operation of the submerged halogen pump is continued: and after the well washing work on the same day is finished, continuing to keep the operation of the maximum power of the submerged halogen pump until the brine pumped from the brine extraction well is clear from turbidity, and then finishing pumping water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210565521.6A CN114922564B (en) | 2022-05-23 | 2022-05-23 | Withdrawing type well washing process for horizontal well in salt lake region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210565521.6A CN114922564B (en) | 2022-05-23 | 2022-05-23 | Withdrawing type well washing process for horizontal well in salt lake region |
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| CN114922564A true CN114922564A (en) | 2022-08-19 |
| CN114922564B CN114922564B (en) | 2023-01-20 |
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Citations (5)
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| KR100936460B1 (en) * | 2009-07-23 | 2010-01-18 | 주식회사 에스제이지반기술 | A well washing device |
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| CN112127831A (en) * | 2020-08-24 | 2020-12-25 | 山成栋 | Construction method for brine recovery well of salt lake |
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2022
- 2022-05-23 CN CN202210565521.6A patent/CN114922564B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100936460B1 (en) * | 2009-07-23 | 2010-01-18 | 주식회사 에스제이지반기술 | A well washing device |
| CN104196498A (en) * | 2014-08-21 | 2014-12-10 | 青海盐湖工业股份有限公司 | Brine drilling and exploiting system and method for dynamic cleaning and salt deposition resisting in closed cycle mode |
| US20180187523A1 (en) * | 2016-05-11 | 2018-07-05 | Sichuan Xingzhi Zhihui Intellectual Property Operation Co., Ltd. | Horizontal well completion tubing string capable of achieving sublevel mining |
| CN111101905A (en) * | 2019-10-30 | 2020-05-05 | 青海中煤地质工程有限责任公司 | Brine well mining and well completion process for pore type brine seam of salt lake mining area |
| CN112127831A (en) * | 2020-08-24 | 2020-12-25 | 山成栋 | Construction method for brine recovery well of salt lake |
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