CN112282718A - Combined pipe string for sidetracking well and slim hole well and use method - Google Patents
Combined pipe string for sidetracking well and slim hole well and use method Download PDFInfo
- Publication number
- CN112282718A CN112282718A CN202011224387.0A CN202011224387A CN112282718A CN 112282718 A CN112282718 A CN 112282718A CN 202011224387 A CN202011224387 A CN 202011224387A CN 112282718 A CN112282718 A CN 112282718A
- Authority
- CN
- China
- Prior art keywords
- pipe
- string
- well
- hydraulic
- packer
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims description 11
- 238000005488 sandblasting Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000002407 reforming Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract description 10
- 230000006378 damage Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 208000027418 Wounds and injury Diseases 0.000 abstract description 2
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 11
- 238000011161 development Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
-
- 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
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a combined pipe string for a sidetracking well and a small well and a using method thereof, wherein the pipe string comprises a continuous oil pipe, a crossover sub, a small-diameter pipe, a hydraulic safety joint, a hydraulic sand blower, a balance valve, a hydraulic anchor, a lower packer and a guide head, wherein the continuous oil pipe is positioned in an upper sleeve, the lower part in the upper sleeve is provided with a hanging packer, and the lower end of the hanging packer is connected with a lower sleeve; the coiled tubing pass through crossover sub and small diameter union coupling, small diameter pipe be located the lower casing intraductal, small diameter pipe lower extreme connect gradually hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and direction head. The combined pipe string provided by the invention is effectiveRealize 31/2"the staged fracturing of sleeve pipe stratum, as fracturing tubular column use have safe and reliable, the transformation scale is big, the unrestricted advantage of transformation segment number, as the production tubular column use have the full life-span drainage gas production effectual, with low costs, it is little to the reservoir injury.
Description
Technical Field
The invention relates to the technical field of underground operation of oil field exploration and development, in particular to a combined pipe string for a sidetrack well and a slim hole well and a using method thereof, which are suitable for staged fracturing modification and well completion production of reservoirs of a gas field sidetrack well and similar gas field slim hole wells.
Background
In the face of the current situation of yield and benefit, it is important to develop a low-cost development strategy. Considering the factors of reducing drilling, fracturing and production investment comprehensively, for newly developed wells, the conventional 6' -well bore +5 is considered1/2"casing is gradually towards 5" borehole +41/2"casing and 4" wellbore +31/2"progressive casing transition, in particular 4" wellbore +31/2"casing" is the lowest way of gas well completion cost at present, receives the more and more favor of low-cost strategy. Considering the factors of land acquisition cost, surface equipment cost and the like, sidetracking a new well bore in the old well section is increasingly regarded as an effective process technology. Limited by the original 6 ' well bore of the old well, only 4 ' bit sidetrack can be developed at present, and the lower 3 ' bit can be used1/2Production of cased hole completions. To pair3, in reservoirs with more strata, no matter developing a new well with a slim hole or a sidetrack well with an old well, carrying out1/2"the sleeve staged fracturing and production have great significance for cost reduction and efficiency improvement development, and the technology is in the initial development stage at present and the matching technology is not mature.
The process for hydraulic sand blasting perforation, packer layering and annulus fracturing of the continuous oil pipe has the advantages of simple process, high packing effectiveness, high construction speed, 51/2The application in the sleeve is wide. Is usually in the range of 51/2The size of coiled tubing capable of being put into the casing is
The large-size coiled tubing body has high yield strength and length of more than 6000m, and meets the requirement of fracturing of a horizontal well with a long horizontal section. But 31/2"the casing can be put into the hole at the maximum
The yield strength of the coiled tubing body with the size is only 232KN according to a table check, and the length which can be manufactured at present is about 4500m, so that the yield strength is 31/2The method has the advantages that hydraulic sand blasting perforation, packer layering and annular fracturing process reconstruction risks of the coiled tubing in the casing are large, reconstruction scale is limited, the method is only suitable for a vertical well or a directional well, and a new process method needs to be explored for a horizontal well, particularly a long horizontal section horizontal well; on the other hand, 31/2After the cased well is transformed, coiled tubing can be pressed under pressure to be used as a speed tubular column for production, but the price of the coiled tubing is high, the cost of a single well is generally over 45 ten thousand yuan, and the concept of low-cost development is violated. The patent 'a small diameter water drainage gas production string' (patent number: CN104632091A) proposes to replace a coiled tubing by a small diameter seamless tube, the cost of the small diameter tube with the same diameter is only 40-50% of that of the coiled tubing, but the small diameter tube needs to be put into a casing in a single connection mode, well killing operation needs to be carried out firstly before the small diameter tube is put into a well, the influence on stratum productivity is large, and even early flooding and production stop of a low-yield low-efficiency gas well can be caused.
Disclosure of Invention
In order to overcome the problems of difficult reconstruction, stratum damage caused by reconstruction and high cost in the prior art, the invention provides a combined pipe string for a sidetrack well and a small borehole well and a use method thereof, the invention uses a coiled tubing and a small-diameter pipe combined pipe string with the same pipe diameter to replace a single coiled tubing pipe string to carry out hydraulic sand blasting perforation, packer layering and annular fracturing processes on stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 31/2The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
The technical scheme adopted by the invention is as follows:
a combined pipe string for a sidetracking well and a small borehole well comprises a continuous oil pipe, a crossover sub, a small-diameter pipe, a hydraulic safety joint, a hydraulic sand blaster, a balance valve, a hydraulic anchor, a lower packer and a guide head, wherein the continuous oil pipe is positioned in an upper sleeve, the lower part in the upper sleeve is provided with a suspended packer, and the lower end of the suspended packer is connected with a lower sleeve; the coiled tubing pass through crossover sub and small diameter union coupling, small diameter pipe be located the lower casing intraductal, small diameter pipe lower extreme connect gradually hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and direction head.
The lower casing include vertical section, turning section and slope section, the turning section be the circular arc, small diameter pipe lower extreme pass and hang the packer and indicate the turning section along the direction downwardly extending of lower casing, hydraulic pressure safety joint, hydraulic sand blaster, balanced valve, hydraulic anchor, lower packer and the direction head that small diameter pipe lower extreme is connected are located the slope section of lower casing.
The small-diameter pipe is made of 45# carbon steel.
The inner diameters of the coiled tubing and the small-diameter tubing are the same, and both are
The displacement of the balance valve is less than or equal to 0.05m3At min, the valve is in an open state, and when the displacement is more than 0.10m3At/min, the balance valve is automatically closed.
The setting pressure of the hydraulic anchor and the lower packer is 0.5-1.5 Mpa.
The upper sleeve is 51/2"sleeve pipe, lower sleeve pipe is 31/2A "sleeve.
The lower packer is a K344 packer.
A use method of a combined pipe string for a sidetrack well and a slim hole well comprises the following specific steps:
firstly, completing well opening and flushing operation according to requirements, determining the length of a small-diameter pipe according to requirements, and lowering a combined pipe string for side drilling and small-hole well into a casing pipe through staged fracturing and production;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing a soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint, performing segmented fracturing on the combined string and pressurizing the production string for the sidetracking well and the slim hole well to realize releasing of the hydraulic safety joint, and stringing tools below the hydraulic safety joint to the artificial well bottom;
and fourthly, lifting the combined pipe string, pulling out the coiled tubing and the adapter, and hanging the small-diameter pipe on a wellhead device to be used as a speed pipe string for producing the gas well.
The invention has the beneficial effects that:
firstly, hydraulic sand blasting perforation, packer layering and annular fracturing processes are carried out on stratum reconstruction by replacing a single coiled tubing string with the coiled tubing and the small-diameter tube combined tube string with the same diameter, the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing can be overcome, 31/2' staged fracturing of the casing can be realized, the number of reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
Secondly, annular segmented fracturing is carried out by using a small-pipe-diameter coiled tubing and a small-diameter pipe combined pipe string with the same pipe diameter, the friction of liquid is small, and the discharge capacity can reach 3m3More than min, large scale of modification.
And thirdly, after the transformation is finished, suspending the small-diameter pipe on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, and the gas flow rate in the shaft is increased, thereby improving the liquid carrying capacity of the gas well, ensuring the stable production of the gas well and prolonging the production period of the gas well.
Fourthly, after the transformation is finished, the small-diameter pipe of the fracturing pipe column is directly used as a production pipe column, and compared with a production pipe column which is arranged after the well killing, the production pipe column can be used for one time, the operation period is shortened, the cost for pulling out the pipe column is reduced, and the damage of the well killing fluid to the reservoir is avoided.
Fifthly, a small-diameter pipe made of 45# carbon steel is used for replacing a coiled tubing with the same size to be used as a velocity string for production, and the cost can be saved by 40-50%.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figures, the reference numbers are: 1. sleeving a sleeve; 2. a coiled tubing; 3. a crossover sub; 4. a small diameter tube; 5. a hydraulic safety joint; 6. a hydraulic sand blower; 7. a balancing valve; 8. a hydraulic anchor; 9. a lower packer; 10. a guide head; 11. hanging a packer; 12. and (5) casing pipe descending.
Detailed Description
Example 1:
in order to overcome the problems of difficult reconstruction, formation damage caused by reconstruction and high cost in the prior art, the invention provides a combined pipe string for a sidetracking well and a small well hole as shown in figure 1 and a using method thereofThe fracturing process can overcome the difficulties of insufficient yield strength, insufficient length and the like of the continuous oil pipe and can realize 31/2The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
A combination pipe string for a sidetracking well and a small borehole well comprises a continuous oil pipe 2, an adapter 3, a small-diameter pipe 4, a hydraulic safety joint 5, a hydraulic sand blaster 6, a balance valve 7, a hydraulic anchor 8, a lower packer 9 and a guide head 10, wherein the continuous oil pipe 2 is positioned in an upper casing 1, a hanging packer 11 is arranged at the inner lower part of the upper casing 1, and the lower end of the hanging packer 11 is connected with a lower casing 12; the continuous oil pipe 2 is connected with a small-diameter pipe 4 through a conversion joint 3, the small-diameter pipe 4 is positioned in a lower casing 12, and the lower end of the small-diameter pipe 4 is sequentially connected with a hydraulic safety joint 5, a hydraulic sand blaster 6, a balance valve 7, a hydraulic anchor 8, a lower packer 9 and a guide head 10.
The combined pipe string of the small-caliber continuous oil pipe 2 and the small-caliber pipe 4 with the same diameter is adopted for annular segmented fracturing, the liquid friction resistance is small, and the discharge capacity can reach 3m3More than min, large scale of modification. After the transformation is finished, the small-diameter pipe 2 is directly used as a production pipe column, compared with a production pipe column which is put in a well after killing, the production pipe column can be produced in one less time, the operation period is shortened, the cost for pulling out and putting down the pipe column is reduced, and the damage of the killing fluid to a reservoir stratum is avoided. After the transformation is finished, the small-diameter pipe 4 is hung on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, the gas flow rate in the shaft is increased, the liquid holding capacity of the gas well is improved, the stable production of the gas well is ensured, and the production period of the gas well is prolonged.
The working process of the invention is as follows:
completing the well-through and well-flushing operation as required, determining the length of the small-diameter pipe 4 required by well completion production according to the well logging information and the well structure, and descending into the casing according to the connection sequence of the structure shown in the attached figure 1. The pipe column (combined pipe string) is lowered to the position where the hydraulic sand blaster 6 is aligned with and reforms the first section of reservoir, perforating liquid is injected from the coiled tubing and the small-diameter pipe combined pipe string, and hydraulic sand blasting perforation is carried out. And after the perforation is finished, injecting fracturing fluid from the annular space of the oil sleeve, and simultaneously keeping the low-displacement accompanying injection of the combined pipe string. And repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs. After fracturing is finished, open flow is carried out; after blowout, the fracturing string is lowered to the position of the artificial well bottom, the soluble ball is thrown from the well mouth, the combined string is pressurized after the soluble ball falls to the hydraulic safety joint 5, the hydraulic safety joint 5 is released, and the tool string below the hydraulic safety joint 5 falls to the artificial well bottom. And lifting the combined pipe string, pulling out the coiled tubing 2 and the adapter 3, and suspending the small-diameter pipe 4 on a wellhead device to be used as a speed pipe string for gas well production.
The reagent liquid involved in the present invention is the prior art, and will not be further described in the present invention. The invention replaces the single coiled tubing string with the coiled tubing string of 2 and 4 combined strings of small diameter tubes with the same diameter to carry out the hydraulic sand blasting perforation, packer layering and annular fracturing processes on the stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 31/2The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
Example 2:
based on embodiment 1, in this embodiment, preferably, the lower casing 12 includes a vertical section, a corner section and an inclined section, the corner section is a circular arc, the lower end of the small diameter pipe 4 passes through the suspended packer 11 and extends downwards along the direction of the lower casing 12 to indicate the corner section, the hydraulic safety joint 5 connected to the lower end of the small diameter pipe 4, the hydraulic sand blower 6, the balance valve 7, the hydraulic anchor 8, the lower packer 9 and the guide head 10 are located in the inclined section of the lower casing 12.
Preferably, the small-diameter pipe 4 is made of 45# carbon steel.
Preferably, the inner diameters of the coiled tubing 2 and the small-diameter tube 4 are the same, and both are
Preferably, the balance valve 7 has a displacement less than or equal to 0.05m3At min, the valve is in an open state, and when the displacement is more than 0.10m3At/min, the balance valve is automatically closed.
The balance valve 7 in the invention has the discharge capacity of less than or equal to 0.05m3The packer is in an open state at the time of min, so that the hydraulic anchor 8 and the K344 packer are prevented from being set midway due to the throttling action of the hydraulic sand blaster 6 in the lowering process of the pipe column; when the discharge capacity is more than 0.10m3And at the time of/min, the balance valve is automatically closed, so that the fluid can be sprayed out from the hydraulic sand blaster 6 only when the perforation and the fracturing are carried out.
Preferably, the setting pressure of the hydraulic anchor 8 and the lower packer 9 is 0.5-1.5 MPa.
Preferably, the upper casing 1 is 51/2"Sleeve, lower sleeve 12 is 31/2A "sleeve.
Preferably, the lower packer 9 is a K344 packer.
A use method of a combined pipe string for a sidetrack well and a slim hole well comprises the following specific steps:
firstly, completing the well-through and well-flushing operation according to requirements, determining the length of the small-diameter pipe 4 according to requirements, and lowering the combined pipe string for the sidetracking well and the small-bore well into a casing pipe through staged fracturing and production;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing the soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint 5, performing segmented fracturing and production string pressurization on the combined string for the sidetracking well and the slim well, so as to realize releasing of the hydraulic safety joint 5 and make the tool below the hydraulic safety joint 5 fall to the artificial well bottom;
and fourthly, lifting the combined pipe string, pulling out the coiled tubing 2 and the adapter 3, and suspending the small-diameter pipe 4 on a wellhead device to be used as a speed pipe string for gas well production.
The invention replaces the single coiled tubing string with the coiled tubing string of 2 and 4 combined strings of small diameter tubes with the same diameter to carry out the hydraulic sand blasting perforation, packer layering and annular fracturing processes on the stratum reconstruction, can overcome the difficulties of insufficient yield strength, insufficient length and the like of the coiled tubing, and can realize 31/2The staged fracturing of the casing is safe and reliable, the number of the reconstruction sections is not limited, and the method is suitable for sidetracking and conventional slim-hole wells.
The combined pipe string of the small-caliber continuous oil pipe 2 and the small-caliber pipe 4 with the same diameter is adopted for annular segmented fracturing, the liquid friction resistance is small, and the discharge capacity can reach 3m3More than min, large scale of modification.
After the transformation is finished, the small-diameter pipe 4 is hung on a wellhead device to be used as a speed pipe column for production, so that the critical liquid carrying flow rate of the gas well can be reduced in the whole life cycle from production to abandonment, the gas flow rate in the shaft is increased, the liquid holding capacity of the gas well is improved, the stable production of the gas well is ensured, and the production period of the gas well is prolonged.
After the transformation is finished, the small-diameter pipe 2 is directly used as a production pipe column, compared with a production pipe column which is put in a well after killing, the production pipe column can be produced in one less time, the operation period is shortened, the cost for pulling out and putting down the pipe column is reduced, and the damage of the killing fluid to a reservoir stratum is avoided.
According to the invention, the small-diameter pipe 4 made of 45# carbon steel is adopted to replace the coiled tubing 2 with the same size to be used as a velocity string for production, so that the cost can be saved by 40-50%.
The invention effectively realizes the connection of the coiled tubing 2 and the small-diameter tube 4 with the same diameter by the combination tube string 31/2"the staged fracturing of sleeve pipe stratum, as fracturing tubular column use have safe and reliable, the transformation scale is big, the unrestricted advantage of transformation segment number, as the production tubular column use have the full life-span drainage gas production effectual, with low costs, it is little to the reservoir injury.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention. The apparatus structure and the method steps thereof, which are not described in detail in the present invention, are prior art and will not be further described in the present invention.
Claims (9)
1. A combination string for sidetracking wells and slim-hole wells, characterized in that: the hydraulic control system comprises a continuous oil pipe (2), a crossover sub (3), a small-diameter pipe (4), a hydraulic safety joint (5), a hydraulic sand blaster (6), a balance valve (7), a hydraulic anchor (8), a lower packer (9) and a guide head (10), wherein the continuous oil pipe (2) is positioned in an upper casing (1), a suspended packer (11) is arranged at the lower part in the upper casing (1), and the lower end of the suspended packer (11) is connected with a lower casing (12); coiled tubing (2) be connected with minor diameter pipe (4) through crossover sub (3), minor diameter pipe (4) be located lower casing (12), minor diameter pipe (4) lower extreme connect gradually hydraulic pressure safety joint (5), hydraulic sand blaster (6), balanced valve (7), hydraulic anchor (8), lower packer (9) and direction head (10).
2. The string of claim 1, wherein: lower casing (12) including vertical section, corner section and slope section, the corner section be the circular arc, minor diameter pipe (4) lower extreme pass and hang packer (11) and indicate the corner section along the direction downwardly extending of lower casing (12), hydraulic pressure safety joint (5) that minor diameter pipe (4) lower extreme is connected, hydraulic sand blasting ware (6), balanced valve (7), hydraulic anchor (8), lower packer (9) and direction head (10) are located the slope section of lower casing (12).
3. The string of claim 1, wherein: the small-diameter pipe (4) is made of 45# carbon steel.
4. The string of claim 1, wherein: what is needed isThe inner diameters of the coiled tubing (2) and the small-diameter tube (4) are the same and are both
5. The string of claim 1, wherein: the displacement of the balance valve (7) is less than or equal to 0.05m3At min, the valve is in an open state, and when the displacement is more than 0.10m3At/min, the balance valve is automatically closed.
6. The string of claim 1, wherein: the setting pressure of the hydraulic anchor (8) and the lower packer (9) is 0.5-1.5 Mpa.
7. The string of claim 1, wherein: the upper sleeve (1) is 51/2"sleeve pipe", lower sleeve pipe (12) is 31/2A "sleeve.
8. The string of claim 1, wherein: the lower packer (9) is a K344 packer.
9. A use method of a combined pipe string for a sidetrack well and a slim hole well is characterized in that: the method comprises the following specific steps:
firstly, completing well opening and flushing operation according to requirements, determining the length of a small-diameter pipe (4) according to requirements, and lowering a combined pipe string for a sidetrack well and a small-bore well into a casing pipe through staged fracturing and a production pipe string;
secondly, after the combined pipe string is put in place, reforming a first section of reservoir, injecting perforating fluid from the combined pipe string, and performing hydraulic sand blasting perforation; after perforation is finished, injecting fracturing fluid from the oil sleeve annulus, and simultaneously keeping the combined pipe string in tracing injection; repeating the steps, and dragging the fracturing drilling tool by the combined pipe string to sequentially complete the reconstruction of other reservoirs;
thirdly, after fracturing, open flow is carried out; after blowout is finished, lowering the fracturing string to the position of the artificial well bottom, throwing a soluble ball from the well mouth, and after the soluble ball falls to the hydraulic safety joint (5), performing segmented fracturing on the combined string for the sidetracking well and the slim well and pressurizing the production string to realize releasing of the hydraulic safety joint (5), wherein a tool string below the hydraulic safety joint (5) falls to the artificial well bottom;
and fourthly, lifting the combined pipe string column, pulling out the coiled tubing (2) and the adapter (3), and suspending the small-diameter pipe (4) on a wellhead device to be used as a speed pipe column for gas well production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224387.0A CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011224387.0A CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112282718A true CN112282718A (en) | 2021-01-29 |
| CN112282718B CN112282718B (en) | 2022-12-02 |
Family
ID=74350570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011224387.0A Active CN112282718B (en) | 2020-11-05 | 2020-11-05 | Combined pipe string for sidetracking well and slim hole well and use method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112282718B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045635A (en) * | 2022-06-07 | 2022-09-13 | 西南石油大学 | Tool and method suitable for downhole pressurized well completion of gas and liquid drilling |
| CN115324538A (en) * | 2022-08-09 | 2022-11-11 | 西南石油大学 | Perforation pipe string dynamic system and analysis method for oil and gas exploration |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030121663A1 (en) * | 2001-12-31 | 2003-07-03 | Xiaowei Weng | Method and apparatus for placement of multiple fractures in open hole wells |
| CN102562017A (en) * | 2010-12-29 | 2012-07-11 | 安东石油技术（集团）有限公司 | Sand blasting, perforating and fracturing method |
| US20120211127A1 (en) * | 2011-02-18 | 2012-08-23 | Daido Steel Co., Ltd. | Hollow drilling steel rod and method of manufacturing the same |
| CN102777156A (en) * | 2012-07-20 | 2012-11-14 | 中国石油化工股份有限公司 | Fracturing method for multi-interval oil and gas wells |
| CN203321476U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer technique pipe for repeated reconstruction of old wells |
| CN104632091A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Minor-diameter water draining and gas producing pipeline column |
| CN104695927A (en) * | 2015-01-27 | 2015-06-10 | 中国石油天然气股份有限公司 | Fracturing and completion integrated method adopting coiled tubing and production tubing combined tubing string |
| CN204782945U (en) * | 2015-07-06 | 2015-11-18 | 中国石油化工股份有限公司 | Double -barrelled oil production pipe of sleeve pipe absorption well |
| CN108194071A (en) * | 2017-12-18 | 2018-06-22 | 中国石油天然气股份有限公司 | A kind of 3 cun of half side tracked slim hole fracturing strings |
| US20200131861A1 (en) * | 2018-10-24 | 2020-04-30 | Saudi Arabian Oil Company | Completing slim-hole horizontal wellbores |
-
2020
- 2020-11-05 CN CN202011224387.0A patent/CN112282718B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030121663A1 (en) * | 2001-12-31 | 2003-07-03 | Xiaowei Weng | Method and apparatus for placement of multiple fractures in open hole wells |
| CN102562017A (en) * | 2010-12-29 | 2012-07-11 | 安东石油技术（集团）有限公司 | Sand blasting, perforating and fracturing method |
| US20120211127A1 (en) * | 2011-02-18 | 2012-08-23 | Daido Steel Co., Ltd. | Hollow drilling steel rod and method of manufacturing the same |
| CN102777156A (en) * | 2012-07-20 | 2012-11-14 | 中国石油化工股份有限公司 | Fracturing method for multi-interval oil and gas wells |
| CN203321476U (en) * | 2013-06-05 | 2013-12-04 | 中国石油天然气股份有限公司 | Coiled tubing controllable packer technique pipe for repeated reconstruction of old wells |
| CN104632091A (en) * | 2013-11-15 | 2015-05-20 | 中国石油天然气股份有限公司 | Minor-diameter water draining and gas producing pipeline column |
| CN104695927A (en) * | 2015-01-27 | 2015-06-10 | 中国石油天然气股份有限公司 | Fracturing and completion integrated method adopting coiled tubing and production tubing combined tubing string |
| CN204782945U (en) * | 2015-07-06 | 2015-11-18 | 中国石油化工股份有限公司 | Double -barrelled oil production pipe of sleeve pipe absorption well |
| CN108194071A (en) * | 2017-12-18 | 2018-06-22 | 中国石油天然气股份有限公司 | A kind of 3 cun of half side tracked slim hole fracturing strings |
| US20200131861A1 (en) * | 2018-10-24 | 2020-04-30 | Saudi Arabian Oil Company | Completing slim-hole horizontal wellbores |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045635A (en) * | 2022-06-07 | 2022-09-13 | 西南石油大学 | Tool and method suitable for downhole pressurized well completion of gas and liquid drilling |
| CN115324538A (en) * | 2022-08-09 | 2022-11-11 | 西南石油大学 | Perforation pipe string dynamic system and analysis method for oil and gas exploration |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112282718B (en) | 2022-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6681862B2 (en) | System and method for reducing the pressure drop in fluids produced through production tubing | |
| GB2550795B (en) | Downhole hydraulic jetting assembly | |
| RU2378479C2 (en) | Method and device for implementation of processes in underground borehole by means of usage of flexible well casing | |
| US7934563B2 (en) | Inverted drainholes and the method for producing from inverted drainholes | |
| CN101942962B (en) | Well drilling method of through tubing of gas lift under-balanced coiled tubing | |
| US7603758B2 (en) | Method of coupling a tubular member | |
| EP1701000B1 (en) | A method and apparatus for consolidating a wellbore | |
| CN102575512B (en) | Expandable liner tieback connection | |
| CN112211601B (en) | Coiled tubing and packer combined staged fracturing string for slim-hole well and method | |
| CN112282718B (en) | Combined pipe string for sidetracking well and slim hole well and use method | |
| CN104912479B (en) | Method for drilling and completion of horizontal branched well for coal bed gas | |
| CN112267866B (en) | Small-diameter pipe staged fracturing production pipe column and method for side drilling well and small-hole well | |
| CN112431579B (en) | Preset small-diameter pipe internal fracturing device and method for side drilling well and small-hole well | |
| CN103089193A (en) | Tail pipe completion method by plugging expandable casing on top of screen pipe | |
| CN111810106B (en) | Three-inch half-slim hole sidetrack horizontal well efficient staged fracturing method | |
| CN106837171A (en) | A kind of compact reservoir radial direction boring means external member | |
| CN108204228B (en) | Composite fracturing process pipe column and using method thereof | |
| CN109594922A (en) | The method that water jet bores radial well operations | |
| US6186238B1 (en) | Assembly and method for the extraction of fluids from a drilled well within a geological formation | |
| CN107882515A (en) | A kind of sleeve pipe suspending apparatus | |
| CN110748293A (en) | Multilateral well open hole completion method | |
| CN112502682B (en) | Production method of preset small-diameter pipe for side drilling well and small-hole well | |
| CN115822530A (en) | Long horizontal section under-pressure drill rod transmission well-flushing and perforation integrated tool and method | |
| CN2758455Y (en) | Expanding tool of expandable pipe for use in petroleum engineering | |
| CN211115946U (en) | Casing cementing slim hole staged fracturing device |
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 |