CN112502682B - Production method of preset small-diameter pipe for side drilling well and small-hole well - Google Patents
Production method of preset small-diameter pipe for side drilling well and small-hole well Download PDFInfo
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- CN112502682B CN112502682B CN202011225780.1A CN202011225780A CN112502682B CN 112502682 B CN112502682 B CN 112502682B CN 202011225780 A CN202011225780 A CN 202011225780A CN 112502682 B CN112502682 B CN 112502682B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000005553 drilling Methods 0.000 title claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 45
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 15
- 238000010008 shearing Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 4
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 13
- 238000012986 modification Methods 0.000 abstract description 8
- 230000004048 modification Effects 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 238000011161 development Methods 0.000 description 4
- 210000000664 rectum Anatomy 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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Abstract
The invention provides a method for producing a preset small-diameter pipe for a side drilling well and a slim hole well, which comprises the following steps: firstly, putting a fracturing string produced by open hole packers for side drilling and small-hole wells and a preset small-diameter pipe down to a preset position of a target reservoir, ensuring that a casing packer is suspended at a position 10-15 m above a window of the side drilling, aligning a sand blaster to the reservoir to be modified, clamping the modified section of the reservoir by a plurality of reservoir packers, and avoiding casing joint hoops; step two, a pumping large-diameter steel ball is located at the reducing release tieback cylinder, and when the pressure is increased to 25Mpa, a casing packer and a reservoir packer are set; when the pressure reaches 35Mpa, the releasing and connecting cylinder loses 3 hands and the part above the releasing and connecting cylinder is lifted out. The invention injects fracturing fluid from oil sleeve annulus, the construction displacement can reach 6m3More than min, the scale of modification can be enlarged, and the extension distance of the crack can be prolonged; the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of underground operation of oil field exploration and development, in particular to a method for producing a preset small-diameter pipe for a side drilling well and a small borehole well, and belongs to the technical field of repeated fracturing of oil and gas fields.
Background
Along with most of oil reservoirs in China gradually enter the middle and later stages of development, residual oil on the stratum is effectively used, the potential of the oil reservoirs is fully excavated, the maintenance of stable yield of old areas at low cost is particularly urgent, factors such as reduction of drilling input, land acquisition cost and ground equipment cost are comprehensively considered, and the sidetrack drilling of new boreholes at the original old well sections is increasingly regarded as an effective process technology. For reservoirs with more strata, the development of the sublevel fracturing of the sidetracking slim hole has great significance for fully excavating the potential of the oil reservoir.
Limited by the original 5 "sleeve size, the existing Changqing old oilfield side drilling commonly uses a 4" drill bit windowing side drilling, and the slim-hole well can selectively hang a 3 "barefoot packer modification tool for staged fracturing modification, but the conventional barefoot packer modification tool has the following problems: firstly, the 3 magnetically fracturing string injects fracturing fluid, so that the friction of the fluid is high, the construction displacement is small, and the modification scale is limited; and secondly, the 3 As fracturing string is used as a production string, and for a water producing reservoir, in the liquid carrying process of the gas well, the large-diameter shaft can aggravate liquid slippage, so that the accumulated liquid in the shaft is continuously increased, and the yield and the production rate of the gas well are directly influenced. 1-1 coiled tubing is put in a 3-1-fractured-well string to be used as a velocity string for drainage and gas production, so that the liquid holding capacity of a gas well can be improved, and the stable production of the gas well is ensured. However, because the price of the coiled tubing is high and a professional operation tool is required to be matched, the construction cost of a single well is generally over 45 ten thousand yuan, which is contrary to the concept of low-cost development. The patent 'a small diameter water drainage gas production string' (patent number: CN 104632091A) 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 the productivity of a stratum 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 solve the problems of short service life and great damage to a reservoir of the existing gas well, the invention provides a method for producing a preset small-diameter pipe for a side drilling well and a small well hole. According to the invention, the small-diameter pipe is adopted to replace a coiled tubing to be used as a speed string to be put into the shaft, so that the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
The technical scheme adopted by the invention is as follows:
a method for producing a preset small-diameter pipe for a side drilling well and a small borehole well comprises the following specific steps:
firstly, putting a fracturing string produced by open hole packers for side drilling and small-hole wells and a preset small-diameter pipe down to a preset position of a target reservoir, ensuring that a casing packer is suspended at a position 10-15 m above a window of the side drilling, aligning a sand blaster to the reservoir to be modified, clamping the modified section of the reservoir by a plurality of reservoir packers, and avoiding casing joint hoops;
step two, a pumping large-diameter steel ball is located at the reducing release tieback cylinder, and when the pressure is increased to 25Mpa, a casing packer and a reservoir packer are set; when the pressure is increased to 35Mpa, the releasing and connecting cylinder releases the releasing and connecting cylinder, and the part above the releasing and connecting cylinder is lifted out;
determining the length of the small-diameter pipe according to the requirement, putting the small-diameter pipe into the sleeve, and suspending the small-diameter pipe to the fracturing wellhead;
pumping a soluble ball corresponding to the sand blaster from the annular spaces of the casing and the small-diameter pipe to be located at the first-stage sand blaster, pressurizing 20Mpa to cut off the shear pin, pushing the outer sliding sleeve to integrally move downwards, and injecting fracturing fluid from the annular spaces of the casing and the small-diameter pipe after a fracturing port on the sliding sleeve body is exposed, so as to perform hydraulic fracturing on the first-stage reservoir stratum;
step five, repeating the step four, pumping soluble balls with corresponding specifications from small to large from the annular space of the sleeve and the small-diameter pipe, and completing hydraulic fracturing transformation of other reservoir layers;
and step six, draining after the transformation is finished, replacing the fractured well mouth as a production well mouth after the drainage is finished, and hanging the small-diameter pipe on a production well mouth device for gas well production.
In the first step, the fracturing string produced by the open hole packer fracturing and preset small diameter pipe for the sidetracking well and the small well comprises a release tieback cylinder, a casing packer, an oil pipe, a plurality of reservoir packers, a plurality of sand blasters, a float collar and a guide sieve pipe, wherein the reservoir packers and the sand blasters are sequentially and alternately arranged, the lower end of the release tieback cylinder is connected with the casing packer, the casing packer is arranged at the lower part in the casing pipe, the lower end of the casing pipe is an open hole section, and the open hole section is obliquely arranged; the reservoir packers are distributed in the open hole section from top to bottom, the lower end of each reservoir packer is provided with a sand blaster, and the sand blaster at the lowest end is sequentially connected with the floating hoop and the guide sieve tube; the reservoir packer at the uppermost end is connected with the lower end of the casing packer through an oil pipe.
The sand blaster comprises an upper joint, an anti-rotation pin, a sealing ring, a check ring, an inner sliding sleeve, a sliding sleeve body, an outer sliding sleeve, a shearing pin, a clamp spring and a lower joint, wherein two ends of the sliding sleeve body are respectively in threaded connection with the upper joint and the lower joint and are fixed through the anti-rotation pin; the middle cylinder wall of the sliding sleeve body is provided with a radial groove hole, a shearing pin is arranged above the groove hole, the outer sliding sleeve is connected in the sliding sleeve body through the shearing pin, and two ends of a connecting surface are provided with sealing rings; the lower part of the outer sliding sleeve is provided with a groove, a snap spring is arranged in the groove, and the lower part in the sliding sleeve body is provided with a groove; the inner sliding sleeve is arranged in the outer sliding sleeve, and the inner wall of the upper part of the outer sliding sleeve is provided with a check ring.
The small-diameter pipe has a pipe diameter of 1' -1, and is made of 45# carbon steel.
The sleeve is a 5 As sleeve.
The hand-losing force of the hand-releasing tieback cylinder is as follows: 33 Mpa-35 Mpa, and the sealing cannula can be buckled and connected after releasing; the setting force of the casing packer and the reservoir packer is 15 Mpa-25 Mpa, and the setting force of the casing packer and the reservoir packers is reduced by 0.5 Mpa-1 Mpa from top to bottom in the direction from the well mouth to the well bottom.
The casing packer is a Y441 packer, and the reservoir packer is a Y341 packer.
The latus rectum is the same in the outer sliding sleeve of every sand blaster, and the interior latus rectum from the bottom up of the inner sliding sleeve of a plurality of sand blasters increases in proper order.
The invention has the beneficial effects that:
1. the fracturing method of the invention is to inject fracturing fluid from the oil sleeve annulus, and the construction displacement can reach 6m3More than min, the scale of modification can be enlarged, and the extension distance of the crack can be prolonged.
2. According to the invention, before fracturing transformation, the small-diameter pipe is put into the casing, so that the problem of pressing the small-diameter pipe underground in the production process is avoided, the damage to a reservoir stratum can be reduced, and the service life of a gas well is prolonged.
3. According to the invention, the small-diameter pipe is adopted to replace a coiled tubing to be used as a speed string to be put into the shaft, so that the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the sand blaster.
In the figures, the reference numbers are: 1. a sleeve; 2. A small diameter tube; 3. a releasing tieback cylinder; 4. a casing packer; 5. an oil pipe; 6. a first reservoir packer; 7. a first sand blaster; 8. A second reservoir packer; 9. a second sand blower; 10. a third reservoir packer; 11. a sand blaster III; 12. floating hoops; 13. guiding the sieve tube; 14. a naked eye section; 15. an upper joint; 16. anti-drop pins; 17. a seal ring; 18. a retainer ring; 19. an inner sliding sleeve; 20. a sliding sleeve body; 21. an outer sliding sleeve; 22. shearing pins 23 and clamp springs; 24. and a lower joint.
The specific implementation mode is as follows:
example 1:
in order to overcome the problems of short service life and great damage to a reservoir of the existing gas well, the invention provides a method for producing a preset small-diameter pipe for a side-drilling well and a small-bore well as shown in figures 1 and 2. According to the invention, the small-diameter pipe is adopted to replace a coiled tubing to be used as a speed string to be put into the shaft, so that the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
A method for producing a preset small-diameter pipe for a side drilling well and a small borehole well comprises the following specific steps:
firstly, putting a fracturing string produced by open hole packers for side drilling and slim hole wells and a preset small-diameter pipe down to a preset position of a target reservoir, ensuring that a casing packer 4 is suspended at a position 10-15 m above a window of the side drilling, aligning a sand blaster to the reservoir to be modified, clamping the modified section of the reservoir by a plurality of reservoir packers, and avoiding casing joint hoops;
step two, a pumping large-diameter steel ball is located at the reducing release tieback cylinder 3, and when the pressure is increased to 25Mpa, the casing packer 4 and the reservoir packer are set; when the pressure is increased to 35Mpa, the releasing tieback cylinder 3 releases the releasing and the part above the releasing tieback cylinder 3 is lifted out;
determining the length of the small-diameter pipe 2 according to requirements, putting the small-diameter pipe 2 into the casing 1, and suspending the small-diameter pipe to a fracturing wellhead;
fourthly, pumping soluble balls corresponding to the sand blasters I11 from the annular spaces of the casing 1 and the small-diameter pipe 2 to be located at a first-stage sand blaster, pressurizing by 20Mpa to cut off the shear pins 22, pushing the outer sliding sleeve 21 to integrally move downwards, and injecting fracturing fluid from the annular spaces of the casing 1 and the small-diameter pipe 2 after a fracturing port on the sliding sleeve body 20 is exposed, so as to perform hydraulic fracturing on a first-stage reservoir stratum;
step five, repeating the step four, pumping soluble balls with corresponding specifications from small to large from the annular space of the casing 1 and the small-diameter pipe 2, and completing hydraulic fracturing modification of other reservoir layers;
and sixthly, draining liquid after the transformation is finished, replacing the fracturing wellhead to be a production wellhead, and hanging the small-diameter pipe on a production wellhead device for gas well production.
The fracturing method of the invention is to inject fracturing fluid from the oil sleeve annulus, and the construction displacement can reach 6m3A/min isIn addition, the reconstruction scale can be enlarged, and the crack extension distance can be prolonged. According to the invention, before fracturing transformation, the small-diameter pipe 2 is put into the casing 1, so that the problem that the small-diameter pipe 2 is pressed down in the production process is avoided, the damage to a reservoir stratum can be reduced, and the service life of a gas well is prolonged. According to the invention, the small-diameter pipe 2 is adopted to replace a coiled tubing to be used as a speed string to be put into the shaft, so that the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
The size of the large-diameter steel ball is determined according to requirements, so that safe construction can be guaranteed, and setting can be realized. The length of the small-diameter pipe 2 required by well completion production is determined according to well logging information and a well body structure, and the length of the oil pipe is determined according to the depth of a constructed oil-gas well and the depth of a producing zone.
The method comprises the steps of firstly lowering a fracturing string produced by an open hole packer fracturing and a preset small-diameter pipe for a side drilling well and a small well into a preset position of a target reservoir, pumping a soluble ball setting packer with specified specifications and releasing the fracturing string, then lowering the small-diameter pipe 2 required by production into a sleeve, opening a sand blaster channel by pumping soluble balls with corresponding specifications from small to large to sequentially perform hydraulic fracturing transformation, and after the transformation is completed, replacing a fracturing wellhead with a production wellhead. The invention injects fracturing fluid from oil sleeve annulus, the construction displacement can reach 6m3More than min, the scale of modification can be enlarged, and the extension distance of the crack can be prolonged; before fracturing transformation, the small-diameter pipe is put into the casing, so that the problem that the small-diameter pipe is pressed down in the production process is avoided, the damage to a reservoir stratum can be reduced, and the service life of a gas well is prolonged; a small-diameter pipe is adopted to replace a coiled tubing to be used as a speed string to be put into a shaft, so that the liquid carrying capacity of the gas well is improved, the production period of the gas well is prolonged, and the production cost of the gas well can be greatly reduced.
Example 2:
based on embodiment 1, in this embodiment, preferably, in the step one, the fracturing string produced by the open hole packer and the preset small diameter pipe for the sidetracking well and the small hole well includes a release tieback cylinder 3, a casing packer 4, an oil pipe 5, a plurality of reservoir packers, a plurality of sand blasters, a float collar 12 and a guide sieve pipe 13, the reservoir packers and the sand blasters are sequentially and alternately arranged, the lower end of the release tieback cylinder 3 is connected with the casing packer 4, the casing packer 4 is arranged at the inner lower part of a casing 1, the lower end of the casing 1 is an open hole section 14, and the open hole section 14 is obliquely arranged; the plurality of reservoir packers are distributed in the open hole section 14 from top to bottom, the lower end of each reservoir packer is provided with a sand blaster, and the sand blaster at the lowest end is sequentially connected with the floating hoop 12 and the guide sieve tube 13; the uppermost reservoir packer is connected to the lower end of a casing packer 4 by tubing 5.
Preferably, the sand blaster comprises an upper joint 15, an anti-rotation pin 16, a sealing ring 17, a retainer ring 18, an inner sliding sleeve 19, a sliding sleeve body 20, an outer sliding sleeve 21, a shearing pin 22, a clamp spring 23 and a lower joint 24, wherein two ends of the sliding sleeve body 20 are respectively in threaded connection with the upper joint 15 and the lower joint 24 and are fixed through the anti-rotation pin 16; a radial slotted hole is formed in the middle cylinder wall of the sliding sleeve body 20, a shearing pin 22 is arranged above the slotted hole, the outer sliding sleeve 21 is connected into the sliding sleeve body 20 through the shearing pin 22, and sealing rings 17 are arranged at two ends of a connecting surface; the lower part of the outer sliding sleeve 21 is provided with a groove, a clamp spring 23 is arranged in the groove, and the lower part of the sliding sleeve body 20 is provided with a groove; the inner sliding sleeve 19 is arranged in the outer sliding sleeve 21, and the inner wall of the upper part of the outer sliding sleeve 21 is provided with a retainer ring 18.
Preferably, the small-diameter tube 2 has a tube diameter of 1' -1, and is made of 45# carbon steel.
Preferably, the cannula 1 is a 5 North' cannula.
Preferably, the releasing force of the releasing tieback cylinder 3 is as follows: 33 Mpa-35 Mpa, and the sealing cannula can be buckled and connected after releasing; the setting force of the casing packer 4 and the reservoir packer is 15 Mpa-25 Mpa, and the setting force of the casing packer 4 and the setting force of the reservoir packers are sequentially reduced by 0.5 Mpa-1 Mpa from top to bottom in the direction from the well mouth to the well bottom.
Preferably, the casing packer 4 is a Y441 packer and the reservoir packer is a Y341 packer.
As shown in fig. 1, the reservoir packer of the present invention includes a first reservoir packer 6, a second reservoir packer 8, and a third reservoir segmenter 10, the corresponding sand blasters include a first sand blaster 7, a second sand blaster 9, and a sand blaster 11, the three reservoir packers seal off reservoirs requiring operations, and the three sand blasters perform effective operations on the corresponding reservoirs according to the overall working process.
Preferably, the inner diameter of the outer sliding sleeve 21 of each sand blaster is the same, and the inner diameters of the inner sliding sleeves 19 of a plurality of sand blasters are sequentially increased from bottom to top.
The lower end of the upper joint 15 and the upper end of the lower joint 24 of the sand blaster are provided with external threads, the external threads are connected with the internal threads of the sliding sleeve body 20, and the rotation of the sliding sleeve body is prevented by an anti-rotation pin 16. The inner sliding sleeve 19 is arranged on the outer sliding sleeve 21 and then is prevented from moving by the retainer ring 18, and the inner drift diameter of each stage of inner sliding sleeve 19 is larger than that of the upper stage of inner sliding sleeve. According to the invention, the snap spring 23 is arranged on the lower part of the outer sliding sleeve 21 through the groove, when the outer sliding sleeve 21 moves downwards and is opened, the snap spring 23 moves downwards to the groove on the lower part of the sliding sleeve body 20, and simultaneously expands and clamps the groove on the lower part of the outer sliding sleeve 21, so that the whole position of the outer sliding sleeve 21 is locked
The working principle of the sand blaster is as follows:
throwing a soluble ball at a well mouth, pumping the soluble ball to sit on the inner sliding sleeve 19, cutting the shearing pin 22 when the pumping pressure rises to a certain value, pushing the outer sliding sleeve 21 to move downwards integrally, exposing a fracturing port on the sliding sleeve body 20 to fracture the section, moving the clamp spring 23 downwards to a groove at the lower part of the sliding sleeve body 20 after the outer sliding sleeve is opened downwards, expanding and clamping the groove at the same time, and locking the position of the whole outer sliding sleeve. After the operation, another ball is put in, and the upper layers are reformed in sequence.
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 (8)
1. A method for producing a preset small-diameter pipe for a side-drilling well and a small-hole well is characterized by comprising the following steps of: the method comprises the following specific steps:
firstly, putting a fracturing string produced by open hole packers for side drilling and slim hole wells and a preset small-diameter pipe down to a preset position of a target reservoir, ensuring that a casing packer (4) is suspended at a position 10-15 m above a side drilling windowing position, aligning a sand blaster to a reservoir to be modified, clamping the modified section of the reservoir by a plurality of reservoir packers, and avoiding casing joint hoops;
step two, a pumping large-diameter steel ball is located at the reducing release tieback cylinder (3), and when the pressure is increased to 25Mpa, a casing packer (4) and a reservoir packer are set; when the pressure is increased to 35Mpa, the releasing and connecting cylinder (3) releases the releasing and connecting cylinder, and the part above the releasing and connecting cylinder (3) is lifted;
determining the length of the small-diameter pipe (2) according to requirements, putting the small-diameter pipe (2) into the casing (1), and suspending the small-diameter pipe to a fracturing wellhead;
fourthly, a soluble ball corresponding to the first-stage sand blaster (11) is placed at the position of the first-stage sand blaster from the annular pumping sand blaster of the casing (1) and the small-diameter pipe (2), a shear pin (22) is cut off by 20Mpa of pressurization, the outer sliding sleeve (21) is pushed to integrally move downwards, and after a fracturing port on the sliding sleeve body (20) is exposed, fracturing fluid is injected from the annular pumping sand blaster of the casing (1) and the small-diameter pipe (2) to perform hydraulic fracturing on a first-stage reservoir stratum;
step five, repeating the step four, pumping soluble balls with corresponding specifications from small to large from the annular space of the casing (1) and the small-diameter pipe (2), and completing hydraulic fracturing reformation of other reservoir layers;
(6) after the transformation is completed, liquid drainage is performed, after the liquid drainage is completed, the fracturing wellhead is replaced to be a production wellhead, and the small-diameter pipe is hung on a production wellhead device and used for gas well production.
2. The method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 1, wherein: in the first step, the fracturing string produced by the open hole packer fracturing and preset small-diameter pipe for the sidetracking well and the small-bore well comprises a releasing tieback cylinder (3), a casing packer (4), an oil pipe (5), a plurality of reservoir packers, a plurality of sand blasters, a floating hoop (12) and a guide sieve pipe (13), wherein the reservoir packers and the sand blasters are sequentially and alternately arranged, the lower end of the releasing tieback cylinder (3) is connected with the casing packer (4), the casing packer (4) is arranged at the inner lower part of a casing (1), the lower end of the casing (1) is an open hole section (14), and the open hole section (14) is obliquely arranged; the plurality of reservoir packers are distributed in the open hole section (14) from top to bottom, the lower end of each reservoir packer is provided with a sand ejector, and the sand ejector at the lowest end is sequentially connected with the float collar (12) and the guide sieve tube (13); the reservoir packer at the uppermost end is connected with the lower end of the casing packer (4) through an oil pipe (5).
3. A method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 2, wherein: the sand blaster comprises an upper joint (15), an anti-rotation pin (16), a sealing ring (17), a check ring (18), an inner sliding sleeve (19), a sliding sleeve body (20), an outer sliding sleeve (21), a shearing pin (22), a clamp spring (23) and a lower joint (24), wherein two ends of the sliding sleeve body (20) are respectively in threaded connection with the upper joint (15) and the lower joint (24) and are fixed through the anti-rotation pin (16); a radial slotted hole is formed in the middle cylinder wall of the sliding sleeve body (20), a shearing pin (22) is arranged above the slotted hole, the outer sliding sleeve (21) is connected into the sliding sleeve body (20) through the shearing pin (22), and sealing rings (17) are arranged at two ends of a connecting surface; the lower part of the outer sliding sleeve (21) is provided with a groove, a clamp spring (23) is arranged in the groove, and the lower part of the inner sliding sleeve body (20) is provided with a groove; the inner sliding sleeve (19) is arranged in the outer sliding sleeve (21), and the inner wall of the upper part of the outer sliding sleeve (21) is provided with a retainer ring (18).
4. The method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 1, wherein: the small-diameter pipe (2) has a pipe diameter of 1-1, and is made of 45# carbon steel.
5. The method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 1, wherein: the sleeve (1) is a 5, Z sleeve.
6. A method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 2, wherein: the releasing and connecting cylinder (3) has the following releasing force: 33 Mpa-35 Mpa, and the sealing cannula can be buckled and connected after releasing; the setting force of the casing packer (4) and the reservoir packer is 15-25 Mpa, and the setting force of the casing packer (4) and the setting force of the reservoir packers are sequentially reduced by 0.5-1 Mpa from top to bottom in the direction from the well mouth to the well bottom.
7. A method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 2, wherein: the casing packer (4) is a Y441 packer (4), and the reservoir packer is a Y341 packer.
8. The method of producing a pre-placed small diameter tubular for sidetracking and slim hole wells according to claim 6, wherein: the inner drift diameter of the outer sliding sleeve (21) of each sand blaster is the same, and the inner drift diameters of the inner sliding sleeves (19) of the plurality of sand blasters are sequentially increased from bottom to top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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