CN115324544B - Completion method of four-well structure of SAGD horizontal production well of super heavy oil reservoir - Google Patents
Completion method of four-well structure of SAGD horizontal production well of super heavy oil reservoir Download PDFInfo
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- 238000010796 Steam-assisted gravity drainage Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000000295 fuel oil Substances 0.000 title claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002344 surface layer Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000006004 Quartz sand Substances 0.000 claims description 12
- 239000010755 BS 2869 Class G Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- 239000002270 dispersing agent Substances 0.000 claims description 5
- 230000005465 channeling Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 17
- 238000012544 monitoring process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a completion method of a four-well structure of an SAGD horizontal production well of an ultra-heavy oil reservoir, which relates to the field of engineering drilling of petroleum and natural gas resources, and comprises the following steps: step 1, drilling from the ground by using a drill bit, vertically downwards drilling to a designed drill depth by using the drill bit, then starting the drill bit, feeding a guide pipe, and injecting boiled water slurry to fix the well to the ground; step 2, a second drill bit is put into the guide pipe, the second drill bit is vertically drilled downwards to the designed second drill depth and then is lifted out, a surface layer sleeve is put into the guide pipe, and two boiled water slurries are injected to fix the well to the ground; step 3, setting a three-way drill bit in the surface casing, starting the three-way drill bit after the three-way drill bit is obliquely drilled downwards to the designed three-way depth, setting a technical casing, and injecting three-way cement slurry to fix the well to the ground; step 4, putting a quarto drill bit into the technical sleeve, horizontally drilling the quarto drill bit to the designed quarto depth, then starting the quarto drill bit, putting the quarto drill bit into a screen pipe, and completing the well; the well completion method can be suitable for large-inner-diameter sieve tubes.
Description
Technical Field
The invention relates to the field of engineering drilling of petroleum and natural gas resources, in particular to a well completion method of a four-well structure of an SAGD horizontal production well of an ultra-heavy oil reservoir.
Background
At present, when SAGD development is carried out on shallow oil reservoirs and medium deep oil reservoirs (oil reservoir buried depths are less than 600 meters) or medium deep oil reservoirs (oil reservoir buried depths are 500-1000 meters), the horizontal production wells are mostly three-well structure bases. The drill bit and casing procedure used in conventional three-well structure completion is: step 1, performing primary opening, drilling by using a drill bit with the diameter of phi 444.5mm, then lifting the drill bit, and lowering a surface casing with the diameter of phi 339.7 mm; step 2, performing secondary drilling, namely drilling in by using a drill bit with the diameter of phi 311mm, then lifting out the drill bit, and lowering a technical sleeve with the diameter of phi 244.5 mm: and 3, performing three-opening, drilling in by using a drill bit with the diameter of 215mm, lifting out the drill bit, and putting in a technical screen pipe with the diameter of 177.8 mm.
The diameter of the casing pipe of the well body structure technology of the conventional SAGD horizontal production well is 216.5mm, the length of the horizontal section is 400-500m generally, and the maximum diameter of the oil-well pump in the well is phi 140mm. However, this conventional well bore configuration is difficult to accommodate and has several problems:
1. the technical sleeve has small drift diameter, and can not meet the requirements of simultaneously feeding an oil pump with phi 160mm and a monitoring tubular column;
2. After the length of the horizontal section is increased, the flow resistance of the sieve tube in the small diameter is increased;
3. The three pipe columns of steam injection, lifting and monitoring are difficult to enter in the SAGD circulation preheating stage.
In view of this, the present inventors have devised a completion method of a four-well structure of an SAGD horizontal production well for super heavy oil reservoirs through repeated experiments according to production design experiences conducted in the field and related fields for many years, so as to solve the problems existing in the prior art.
Disclosure of Invention
The invention provides a well completion method of a four-well structure of an SAGD horizontal production well of an ultra-heavy oil reservoir, which can be suitable for a sieve tube with a large inner diameter, and further is provided with an oil pump with a larger size.
In order to achieve the above purpose, the invention provides a completion method of a four-well structure of an SAGD horizontal production well of an ultra heavy oil reservoir, wherein the completion method comprises the following steps:
Step 1, drilling from the ground by using a drill bit, vertically downwards drilling the drill bit to a designed drill depth, then lifting the drill bit, lowering a guide pipe, and injecting boiled water slurry to fix the well to the ground;
step 2, a two-way drill bit is put into the guide pipe, the two-way drill bit is vertically drilled downwards to the designed two-way depth and then is pulled out, a surface layer sleeve is put into the guide pipe, and two-way water mud is injected to fix the well to the ground;
Step 3, a three-way drill bit is put into the surface casing, the three-way drill bit is obliquely drilled downwards to the designed three-way depth and then is pulled out, a technical casing is put into, and three-way cement slurry is injected to fix the well to the ground;
Step 4, putting a quarto drill bit into the technical sleeve, horizontally drilling the quarto drill bit to a designed quarto depth, then taking out the quarto drill bit, putting the quarto drill bit into a screen pipe for completion;
The outer diameter of the one-way drill bit, the outer diameter of the two-way drill bit, the outer diameter of the three-way drill bit and the outer diameter of the four-way drill bit are sequentially reduced;
the inner diameter of the conduit, the inner diameter of the surface layer sleeve, the inner diameter of the technical sleeve and the inner diameter of the screen tube are sequentially reduced.
A method of completing a four well construction for SAGD horizontal production wells for ultra heavy oil reservoirs as described above wherein, in step 1, the primary cement slurry comprises a class G cement and quartz sand.
The completion method of the SAGD horizontal production well four-well structure of the super heavy oil reservoir, as described above, wherein in step 2, the two-boiled water slurry comprises G-grade cement, quartz sand and an early strength agent.
The completion method of the SAGD horizontal production well four-well structure of the super heavy oil reservoir comprises the following steps of (3) setting cement, quartz sand, a fluid loss agent, an early strength agent, a micro-expansion channeling preventive agent and a dispersing agent.
In the well completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir, in the step 1, the outer diameter of the one-open drill bit is larger than 900mm, the designed one-open depth is 20-40 m, the inner diameter of the conduit is 700-800 mm, and the wall thickness of the conduit is 10-20 mm.
In the well completion method of the SAGD horizontal production well four-well structure of the super heavy oil reservoir, in the step 2, the outer diameter of the two-way drill bit is 600-700 mm, the design two-way depth is 200m, the inner diameter of the surface casing is 450-550 mm, and the wall thickness of the surface casing is 10-15 mm.
In the well completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir, in the step 3, the outer diameter of the three-way drill bit is 400-500 mm, the inner diameter of the technical casing is 300-350 mm, and the wall thickness of the technical casing is 10-15 mm.
In the well completion method of the four-well structure of the SAGD horizontal production well of the ultra heavy oil reservoir, in the step 4, the outer diameter of the four-way drill bit is 280-320 mm, the inner diameter of the screen pipe is 200-300 mm, and the wall thickness of the screen pipe is 1-13 mm.
According to the completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir, the screen pipe is provided with the plurality of slots, each slot is arranged along the axial direction of the screen pipe, and the slots are sequentially arranged at intervals along the circumferential direction of the screen pipe.
The completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir comprises the steps of enabling the section of each slit to be trapezoid, wherein the slit width of the slit on the inner wall of the screen pipe is larger than that of the slit on the outer wall of the screen pipe.
The completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir has the following characteristics and advantages:
Compared with the three-well structure in the prior art, the well completion method of the four-well structure of the SAGD horizontal production well for the super heavy oil reservoir, provided by the invention, has the advantages that one vertical section is formed by using the guide pipe in the step 1, and the other vertical section is formed by using the surface sleeve in the step 2, so that the four-well structure has two vertical sections, further can bear the weight of a larger string, namely, the string with the larger inner diameter can be connected (the larger inner diameter of the string is, the larger weight of the string is), and finally, a larger oil well pump can be installed in the string, thereby effectively improving the productivity of the SAGD horizontal production well for the super heavy oil reservoir.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
FIG. 1 is a schematic diagram of a four well construction of an SAGD horizontal production well for an ultra heavy oil reservoir in accordance with the present invention;
FIG. 2 is a flow chart of an embodiment of a completion method of the SAGD horizontal production well four well construction for an ultra heavy oil reservoir in accordance with the present invention.
Reference numerals illustrate:
100. a quarto well bore structure; 10. A conduit;
20. A surface layer sleeve; 30. A technical sleeve;
40. And (5) a screen pipe.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.
Referring to fig. 1 and 2, the completion method of the four-well structure of the SAGD horizontal production well of the super heavy oil reservoir provided by the invention comprises the following steps:
Step 1, drilling from the ground by using a drill bit, vertically downwards drilling the drill bit to a designed drill depth, then lifting the drill bit, feeding a guide pipe 10, and injecting boiled water slurry to fix the well to the ground;
step 2, a two-way drill bit is put into the guide pipe 10, the two-way drill bit is vertically drilled downwards to the designed two-way depth and then is started, a surface layer sleeve 20 is put into the drill bit, and two boiled water slurries are injected to fix the well to the ground;
Step 3, a three-way drill bit is put into the surface sleeve 20, the three-way drill bit is started after the three-way drill bit is obliquely drilled downwards to the designed three-way depth, the technical sleeve 30 is put into, and three-boiling water slurry is injected to fix the well to the ground;
Step 4, putting a quarto drill bit into the technical sleeve 30, horizontally drilling the quarto drill bit to a designed quarto depth, then taking out the quarto drill bit, putting a screen pipe 40 into the well, and completing the well;
wherein, the outer diameter of the first drill bit, the outer diameter of the second drill bit, the outer diameter of the third drill bit and the outer diameter of the fourth drill bit are sequentially reduced;
the inner diameter of the catheter 10, the inner diameter of the surface casing 20, the inner diameter of the technical casing 30 and the inner diameter of the screen 40 decrease in sequence.
Compared with the three-well structure in the prior art, the well completion method of the four-well structure of the SAGD horizontal production well for the super heavy oil reservoir, provided by the invention, has the advantages that in the step 1, a vertical section is formed by using the guide pipe 10, and in the step 2, a further vertical section is formed by using the surface sleeve, so that the four-well structure has two vertical sections, further can bear the weight of a larger string, namely, the string with the larger inner diameter can be connected (the larger inner diameter of the string is, the larger weight of the string is), and finally, a larger oil well pump can be installed in the string, thereby effectively improving the productivity of the SAGD horizontal production well for the super heavy oil reservoir.
In the present invention, the conduit 10 not only takes the weight of the run-in string, the conduit 10 also has the function of guiding drilling fluid from the surface to the rig floor while drilling the surface borehole.
In an alternative embodiment of the present invention, in step 1, the outer diameter of the one-open drill is greater than 900mm, and the one-open depth is designed to be 20-40 m.
In an alternative example of this embodiment, the inner diameter of the catheter 10 is 700-800 mm and the wall thickness of the catheter 10 is 10-20 mm.
Preferably, the outer diameter of the one-way drill is 914.1mm, the inner diameter of the catheter 10 is 762mm, and the wall thickness of the catheter 10 is 15mm.
In an alternative example of this embodiment, in step 1, a boiled water slurry comprises class G cement and silica sand, wherein the silica sand content is 35 to 40% by mass.
In an alternative embodiment of the present invention, in step 2, the outer diameter of the bi-parting drill is 600-700 mm, and the bi-parting depth is designed to be 200m.
In an alternative example of this embodiment, the inner diameter of the skin sleeve 20 is 450-550 mm and the wall thickness of the skin sleeve 20 is 10-15 mm.
Preferably, the outer diameter of the bi-parting drill bit is 660.5mm, the inner diameter of the surface casing 20 is 508mm, and the wall thickness of the surface casing 20 is 12.7mm.
In an alternative example of this embodiment, in step 2, the secondary boiled water slurry comprises class G cement, quartz sand and an early strength agent, wherein the quartz sand content is 35 to 40% by mass, the early strength agent is a prior art, and class G cement may be a prior art cement, for example, a cement of standard GB 10238-2005.
In an alternative example of this embodiment, the skin sleeve 20 is sheathed with a plurality of resilient centralizers that are sequentially spaced apart along the axial direction of the skin sleeve 20.
Preferably, the distance between two adjacent elastic centralizers is 50m.
In an alternative embodiment of the present invention, in step 3, the outer diameter of the triple-open drill is 400 to 500mm.
In an alternative example of this embodiment, in step 3, the inner diameter of the technical sleeve 30 is 300-350 mm and the wall thickness of the technical sleeve 30 is 10-15 mm.
Preferably, the outer diameter of the three-way drill bit is 444.5mm, and the inner diameter of the technical sleeve 30 is 339.7mm; the wall thickness of the technical sleeve 30 is 13.06mm
In an alternative example of the embodiment, in the step3, the three-start drill bit is inclined downwards to form a stable inclined section, the full angle change rate of the stable inclined section is controlled within 1 degree/30 m, and the full angle change rate of the other well sections except the stable inclined section is controlled within 3 degrees to 6 degrees/30 m. The full angle change rate is a technical term of drilling engineering, and the full angle change rate controlled within 3-6 degrees/30 m means that: 3 DEG/30 m-6 DEG/30 m, i.e. the full angle change rate per 30m is between 3 DEG and 6 deg.
Further, the technical sleeve 30 is sleeved with an elastic centralizer and a rigid roller centralizer, and the elastic centralizer and the rigid roller centralizer are arranged at intervals, and the interval between the elastic centralizer and the rigid roller centralizer is 20-50m.
In an alternative example of this embodiment, in step 3, the triple-boiled cement slurry includes a class G cement, quartz sand, a fluid loss agent, an early strength agent, a micro-expansion channeling inhibitor, and a dispersant. Wherein, the fluid loss agent, the early strength agent, the micro-expansion channeling-preventing agent and the dispersing agent can all adopt the prior art.
In an alternative embodiment of the present invention, in step 4, the outer diameter of the quarto drill is 280-320 mm.
In an alternative example of this embodiment, in step 4, the inner diameter of the screen 40 is 200-300 mm and the wall thickness of the screen 40 is 1-13 mm.
Preferably, the outer diameter of the quarto drill is 309mm, the screen 40 is steel grade TP125H, the inner diameter of the screen 40 is 244.5mm, and the wall thickness of the screen 40 is 11.99mm. Compared with the prior art, the sieve tube 40 has larger inner diameter, so that the oil pump with larger diameter and the detection tubular column can be placed in the sieve tube 40, and the production efficiency of the tubular column is further improved. In an alternative example, the oil pump with phi of 160mm and the monitoring pipe column can be simultaneously put into the screen pipe 40, so that the production efficiency of the SAGD horizontal well is effectively improved, and the drilling requirement of a long horizontal well section of the SAGD horizontal well is met.
Further, the screen pipe 40 is a laser slit screen pipe, slits of the laser slit screen pipe are formed along the axial direction of the screen pipe 40, the slit length is 35mm, the slit interval is 35mm, 55 slits are formed in the circumferential direction of the screen pipe 40, and all the slits are arranged in parallel.
Preferably, the slit of the laser slit sieve tube is trapezoid, the outer slit of the slit corresponds to the top edge of the trapezoid (the width of the slit on the outer wall of the sieve tube), and the inner slit corresponds to the bottom edge of the trapezoid (the width of the slit on the inner wall of the sieve tube), wherein the width of the outer slit is 0.5mm, and the width of the inner slit is 0.8-1mm.
The screen pipe 40 adopts the structure, so that the screen pipe 40 has a sufficient flow area ratio, fluid can be ensured to enter the screen pipe from the stratum more easily, the flow rate of the fluid entering the screen pipe 40 is faster, and the yield is higher; at the same time, the screen 40 is ensured to have enough strength, can bear three pressures of tensile load, radial extrusion load and compression load in the stratum, and the screen 40 can not deform under the maximum load of three different pressures, thereby realizing the maximization of benefits.
In an alternative example of this embodiment, in step 4, the screen 40 is sleeved with a plurality of resilient centralizers, and the plurality of resilient centralizers are sequentially spaced apart along the axial direction of the screen 40, and the spacing between two adjacent resilient centralizers is 20m.
In the invention, various specific parameters of the four-well structure can be calculated through engineering calculation software, the vertical depth of the four-well structure in an oil reservoir is larger than 600m, the length of a horizontal section is larger than 600m, and the casing can be completely lowered into the well completion depth in the oil reservoir, so that compared with a traditional SAGD horizontal production well, the four-well structure has the following effects:
Firstly, the invention can meet the simultaneous downloading of three pipe columns of steam injection, production and monitoring in the cyclic preheating stage by adopting the phi 339.7mm technical sleeve 30 and the phi 244.5mm screen pipe 40.
Secondly, adopting a phi 339.7mm technical sleeve 30, wherein the drift diameter of the technical sleeve 30 is 309.7mm, and the requirements of a phi 160mm oil pump and a monitoring system in the SAGD production stage can be met.
Again, with the Φ244.5mm screen 40, the increase in the path of the screen 40 can reduce the increased flow resistance of the fluid in the wellbore caused by the increase in horizontal leg length.
Finally, the daily oil production during the SAGD stage will increase due to the increased horizontal segment length.
Referring to fig. 2, the implementation process of the completion method of the four-well structure of the SAGD horizontal production well for super heavy oil reservoirs according to the present invention will be described in detail with reference to an embodiment:
step 1, drilling in by using a drill bit with the diameter of phi 914.1mm, drilling the well at the depth of 22m by using a drill bit model P2, lifting out the drill bit, putting in a guide pipe 10 with the diameter of phi 762mm, wherein the wall thickness of the guide pipe 10 is 15mm, and injecting boiled water slurry (cement slurry of G-level cement and 35-40% quartz sand) to fix the well on the ground.
Step 2, performing secondary opening: drilling in by using a two-hole drill bit with the diameter of phi 660.4mm, wherein the model of the two-hole drill bit is P2, the drill depth is 202m, the two-hole drill bit is started, the surface sleeve 20 with the diameter of phi 508mm is put in, the wall thickness of the surface sleeve 20 is 12.7mm, the steel grade is J-55, BC buckle type, an elastic centralizer is used, the interval is 50m, and two-water slurry (cement slurry of G grade cement, 35-40% quartz sand and early strength agent) is injected to well fix the ground.
And 3, performing three drilling operations by using a three-hole drill bit with the diameter of phi 444.5mm, wherein the three-hole drill bit comprises a 444.5 three-hole drill bit, an A962 motor, a float valve, a short non-magnetic, an MWD and a long non-magnetic (wherein the A962 motor, the float valve, the short non-magnetic, the MWD and the long non-magnetic are all in the prior art, the structure and the using method are not repeated here), the three-hole drill bit model is XHP2, the three-hole drill bit starts to be inclined, and the whole angle change rate of the inclined section is required to be controlled within 1 DEG/30 m because the inclined section is required to be produced, and the whole angle change rate of other well sections is controlled within 6 DEG/30 m except the inclined section. MWD guiding while drilling is adopted from the deflecting point to the middle completion, so that accurate target entering at the middle completion is ensured. And (3) a three-hole drill bit is started up until the drill depth reaches 966m, a technical sleeve 30 with the diameter of phi 339.7mm is put in, the wall thickness of the technical sleeve 30 is 13.06mm, the steel grade is TP125H, TPCQ buckling type centering devices and rigid roller centering devices are used, the spacing is 20-50m, and three-hole water slurry (grade G cement, quartz sand, fluid loss agent, early strength agent, micro-expansion channeling preventive and dispersing agent) is injected to well fix to the ground.
And 4, performing four-way drilling by using a four-way drill bit with the diameter phi 309mm, wherein a drilling tool assembly for performing four-way drilling comprises 309 four-way drill bits, XEED, MWD and long non-magnetism (the XEED, the MWD and the long non-magnetism are all in the prior art, the structure and the using method are not repeated here), the model of the four-way drill bit is PDC, and the stage is horizontal drilling, and because the SAGD horizontal production well requires that a horizontal section is completely horizontal, the tool is directed to a rotary guiding tool. And (3) taking out the quarto drill bit from the drill depth to 1667m, and putting in a laser slotted screen pipe with the diameter phi of 244.5mmmm, wherein the wall thickness is 11.99mm, the steel grade is TP125H, and the interval is 20m by using an elastic centralizer. The outer slit of the laser slit sieve tube is 0.5mm, the inner slit is 0.8mm wide, the slit length is 35mm, the slit distance is 35mm, 55 slits are arranged in a circle, and the slits are parallel.
In this embodiment, in steps 1 to 4, specific operation processes of drilling with the corresponding drill bit, running into the corresponding tubular column, and injecting the corresponding cement paste for cementing may refer to the prior art, and will not be described herein.
In this embodiment, taking a middle-deep super heavy oil reservoir in an oil field as an example, the top depth of a target layer of the middle-deep super heavy oil reservoir is 550m, the bottom depth is 670m, the conventional SAGD technology is adopted for development, the length of a horizontal section of a conventional well structure of the oil reservoir is 500m at most, the highest daily oil yield is 120t/d (ton/day), the length of the horizontal section of the horizontal well developed by adopting the well completion method of the invention is 700m, and the highest daily oil yield can reach more than 200t/d (ton/day).
The detailed explanation of the embodiments described above is only for the purpose of explaining the present invention so as to enable a better understanding of the present invention, but these descriptions should not be construed as limiting the present invention in any way, and in particular, the individual features described in the different embodiments may be arbitrarily combined with each other to constitute other embodiments, and these features should be understood as being applicable to any one embodiment, except as explicitly stated to the contrary, without being limited to only the described embodiment.
Claims (7)
1. A completion method for a four-well structure of an ultra heavy oil reservoir SAGD horizontal production well, the completion method comprising:
Step 1, drilling from the ground by using a drill bit, vertically downwards drilling the drill bit to a designed drill depth, then lifting the drill bit, lowering a guide pipe, and injecting boiled water slurry to fix the well to the ground; the outer diameter of the one-open drill bit is larger than 900mm, the one-open depth is designed to be 20-40 m, the inner diameter of the guide pipe is 700-800 mm, and the wall thickness of the guide pipe is 10-20 mm;
Step 2, a two-way drill bit is put into the guide pipe, the two-way drill bit is vertically drilled downwards to the designed two-way depth and then is started out, a surface layer sleeve is put into the guide pipe, a plurality of elastic centralizers are sleeved outside the surface layer sleeve, and two-way water mud is injected to fix the well to the ground; the outer diameter of the two-opening drill bit is 600-700 mm, the design two-opening depth is 200m, the inner diameter of the surface sleeve is 450-550 mm, and the wall thickness of the surface sleeve is 10-15 mm;
Step 3, a three-way drill bit is put into the surface casing, the three-way drill bit is obliquely drilled downwards to the designed three-way depth and then is pulled out, a technical casing is put into, and three-way cement slurry is injected to fix the well to the ground; the outer diameter of the three-opening drill bit is 400-500 mm, the inner diameter of the technical sleeve is 300-350 mm, and the wall thickness of the technical sleeve is 10-15 mm;
Step 4, putting a quarto drill bit into the technical sleeve, horizontally drilling the quarto drill bit to a designed quarto depth, then taking out the quarto drill bit, putting the quarto drill bit into a screen pipe for completion;
The outer diameter of the one-way drill bit, the outer diameter of the two-way drill bit, the outer diameter of the three-way drill bit and the outer diameter of the four-way drill bit are sequentially reduced;
the inner diameter of the conduit, the inner diameter of the surface layer sleeve, the inner diameter of the technical sleeve and the inner diameter of the screen tube are sequentially reduced.
2. The method for completing a four well construction for SAGD horizontal production of ultra heavy oil reservoirs according to claim 1, wherein in step 1, said primary cement slurry comprises grade G cement and quartz sand.
3. The method for completing a four well construction of a SAGD horizontal production well for an ultra heavy oil reservoir according to claim 1, wherein in step 2, the two-stage water slurry comprises a grade G cement, quartz sand, and an early strength agent.
4. The method for completing a four well construction of a SAGD horizontal production well for super heavy oil reservoirs of claim 1, wherein in step 3, the three-boiling cement slurry comprises a class G cement, quartz sand, a fluid loss additive, an early strength agent, a micro-expansion channeling inhibitor, and a dispersant.
5. The method for completing a four-well structure of a SAGD horizontal production well for ultra heavy oil reservoirs according to claim 1, wherein in step 4, the outer diameter of the four-well drill is 280-320 mm, the inner diameter of the screen pipe is 200-300 mm, and the wall thickness of the screen pipe is 1-13 mm.
6. The completion method of the four-well structure of the SAGD horizontal production well for super heavy oil reservoirs according to claim 1, wherein a plurality of slots are formed on the screen pipe, each slot is formed along the axial direction of the screen pipe, and the slots are sequentially arranged at intervals along the circumferential direction of the screen pipe.
7. The method for completing a four-well structure of a SAGD horizontal production well for an ultra heavy oil reservoir according to claim 6, wherein each of said slots has a trapezoidal cross section, and the slot width of said slot is greater at the inner wall of said screen than at the outer wall of said screen.
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