CN116771312A - Mobile hydraulic slotting technology - Google Patents
Mobile hydraulic slotting technology Download PDFInfo
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- CN116771312A CN116771312A CN202310232666.9A CN202310232666A CN116771312A CN 116771312 A CN116771312 A CN 116771312A CN 202310232666 A CN202310232666 A CN 202310232666A CN 116771312 A CN116771312 A CN 116771312A
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- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- 239000003129 oil well Substances 0.000 claims abstract description 19
- 230000035699 permeability Effects 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 50
- 238000005520 cutting process Methods 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 230000008901 benefit Effects 0.000 claims description 6
- 239000002360 explosive Substances 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000005012 migration Effects 0.000 claims description 3
- 238000013508 migration Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- 239000007790 solid phase Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 description 28
- 239000003921 oil Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 20
- 239000004576 sand Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 230000020477 pH reduction Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000008207 working material Substances 0.000 description 1
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
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
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- 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 application relates to a movable hydraulic slotting technology, which comprises the following steps: carrying out hydraulic slotting in an oil well, wherein the slotting size is 2-6cm long and 1cm wide; the oil well is increased in production and injection by a hydraulic slotting technology, and the dense rings around the shaft are relieved: the permeability of the near-well zone is improved, the seepage state of fluid is changed, and the seepage area of oil gas in the stratum is increased.
Description
Technical Field
The application relates to the technical field of petroleum wells, in particular to a movable hydraulic slotting technology.
Background
At present, the petroleum well goes deep underground, and in petroleum exploitation, the following problems exist in movable hydraulic slotting: the diversion capacity of the stratum is reduced due to multiple factors in engineering construction, and the permeability is reduced; production of complex oil-gas water layers by longitudinal superposition is carried out, and water layers are arranged; improving water injection capacity and water absorption profile, and having high water injection pressure; shale gas fracturing, breaking and yield increasing, and stratum breaking pressure is reduced; the production technology of the cement sheath of the casing is not damaged.
The information disclosed in the background section of the application is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art or at least partially solve the technical problems, the present application provides a mobile hydraulic slotting technology, which includes: carrying out hydraulic slotting in an oil well, wherein the slotting size is 2-6cm long and 1cm wide;
the mechanism of increasing yield and injection of the hydraulic slotting is as follows:
a. releasing the dense ring around the shaft: the permeability of the near-well zone is improved;
tangential stress in oil wells:
radial permeability in oil well:
based on the above formula, if the simulated oil well parameters are: depth 1000m; young's modulus 10Gpa; poisson's ratio 0.3; the horizontal ground stress is 12Mpa, the well peripheral stress field is readjusted after slotting, the permeability is obviously improved, the ground stress is reduced, and the permeability is improved;
b. purge well Zhou Wuran: the permeability of the near-well zone is improved;
cutting a plurality of cracks near a shaft by using a hydraulic knife, removing pollution around the shaft, and removing blockage of stratum around the shaft;
c. changing the seepage state of the fluid and increasing the seepage area of the oil gas in the stratum;
the hydraulic slotting can cut a long seam with the depth of 1.5m in the stratum, so that the oil drainage area is greatly increased; the well Zhou Yingli is changed, micro-cracks are formed around the slotted surface, and the oil drainage area is increased.
The well perimeter contamination and formation plugging mainly includes: water sensitivity damage, particulate migration damage, scaling damage, solid phase particle intrusion damage, and water lock damage.
The advantages of hydraulic slotting include:
firstly, the hydraulic slotting opening area is large;
secondly, the hydraulic slotting leakage area is large;
thirdly, accurate reconstruction and controllability of hydraulic slotting positioning are realized;
fourthly, the depth of the hydraulic slotting cutting stratum is large, and the seepage area of the stratum is increased;
fifth, hydraulic kerf altering well Zhou Yingli
Sixth, the hydraulic slotting is stroke-moving type slow cutting, and cutting is uniform.
The hydraulic slotting opening area is large, and the hydraulic slotting opening area is specifically as follows:
area of opening on the sleeve using mobile hydraulic injection technique: 10mm x 20mm x 6 = 1200mm 2 ；
Opening area of standard initiating explosive device perforations on casing (16 holes per meter): 10mm x 3.14/4 x 16 = 1256mm 2 ；
From the calculation of the open area on the sleeve alone:
6 mobile hydraulic jets of 2cm length are equivalent to 1m perforated by conventional firers;
3 sections are cut in the length range of 1 meter, and the open area of the 1 meter sleeve is 3 times of the perforation area of the 1 meter.
The hydraulic slotting leakage area is large, and the hydraulic slotting leakage area is specifically as follows:
6 seam formation drainage area with a cluster depth of 1.2 meters: substantial elevation of drainage area 1200mm x 50mm x 2 x 6 = 720000mm2.8-1/2 "open hole perforations per meter drainage area 215.9mm x 3.14 x 1000mm = 677926mm 2 ；
The transformation effect of one-time slotting of 5cm is equivalent to that of an open hole section of 1.2m, 3 sections are slotted within the length range of 1.2m, and the stratum drainage area of the hydraulic slotting is 3 times of that of the conventional perforation drainage area.
The hydraulic slotting positioning is accurate and controllable, and is concretely as follows:
the thin layer which is difficult to implement by other measures can be accurately transformed after one-time well descending, the water layer is avoided, the seam width is controlled, and the length of the hydraulic cutting seam is controllable: 2-6cm.
The hydraulic slotting cutting stratum depth is large, the stratum seepage area is increased, and the hydraulic slotting cutting stratum depth is specifically as follows:
a mobile slow cutting process, the cutting time is usually 1-2 hours, so that a compaction pollution zone of conventional perforation instant explosion does not exist; conventional 1.5m deep into stratum, such as adding nitrogen for cutting, the depth can reach 15-20 m.
The hydraulic kerf altering well Zhou Yingli is specifically as follows:
for conventional sandstone with relatively developed pores, the original stress field is adjusted after slotting, and a low tensile stress area is formed around the well, so that the compacted zone rock stratum is loosened and generates new cracks, and the influence radius reaches more than ten meters.
The hydraulic slotting is stroke-movable slow cutting, and the cutting is uniform, and is specifically as follows:
the travel is movable type slow cutting, the travel movement is hardly seen on the ground, the ball throwing excitation liquid cavity moves, the whole cutting pipe column is not moved, the phenomenon that other domestic cutting pipe columns move up and down to cause uneven cutting stratum and casing is avoided, and the casing strength is damaged.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the mobile hydraulic slotting technology provided by the embodiment of the application, hydraulic slotting is performed in an oil well, and the slotting size is 2-6cm long and 1cm wide; releasing the dense ring around the shaft: the permeability of the near-well zone is improved, the seepage state of fluid is changed, and the seepage area of oil gas in the stratum is increased.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a graph showing a post-slotting well Zhou Yingli of a mobile hydraulic slotting technique according to an embodiment of the present application;
FIG. 2 is a graph showing a ratio distribution of a post-slotting well Zhou Shentou of a mobile hydraulic slotting technique according to an embodiment of the present application;
FIG. 3 is a schematic illustration of a well Zhou Wuran slotting of a mobile hydraulic slotting technique according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a perforation compaction contaminated belt of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 5 is a schematic diagram of experimental results of a second embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application.
Fig. 6 is a schematic diagram of experimental results of a second embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application.
FIG. 7 is a schematic diagram of an application of a mobile hydraulic slotting technique in a conventional well according to an embodiment of the present application;
FIG. 8 is a schematic diagram of an application effect of a mobile hydraulic slotting technique according to an embodiment of the present application;
FIG. 9 is a schematic diagram of an application effect of a mobile hydraulic slotting technique in the water injection, production and exploration fields according to an embodiment of the present application;
fig. 10 is a schematic diagram of experimental results of a third embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 11 is a schematic diagram of experimental results of a third embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 12 is a schematic diagram of experimental results of a fourth embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 13 is a schematic diagram of experimental results of a fourth embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 14 is a schematic diagram of experimental results of a fifth embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 15 is a schematic diagram of experimental results of a fifth embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 16 is a schematic diagram of experimental results of a sixth embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 17 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 18 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 19 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 20 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 21 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 22 is a schematic diagram of experimental results of a seventh embodiment of a mobile hydraulic slotting technique according to an embodiment of the present application;
fig. 23 is a schematic structural diagram of a hydraulic slotting device of a mobile hydraulic slotting technology according to an embodiment of the present application;
FIG. 24 is a cross-sectional view of a hydraulic slitting device of a mobile hydraulic slitting technique according to an embodiment of the present application;
fig. 25 is a flow chart of the present application.
Fig. 26 is a power plant layout.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
For easy understanding, a mobile hydraulic slotting technique according to an embodiment of the present application will be described in detail, as shown in fig. 23 to 24,
comprising the following steps: the device comprises a continuous oil pipe connector 1, a double-flap check valve 2, a safety release 3, a slotting power assembly 4, a ball throwing type perforating gun 5, a bypass sealing tool 6, a sealing adapter 7 and a bridge plug 8.
Specifically, the construction sequence of the hydraulic slotting is as follows:
1. job preparation
1) A safety conference is held, and site supervision is used for explaining the operation steps and key difficulties to operators;
2) Testing the BOP;
3) Well control exercise;
4) Preparing working materials such as oil pipes, variable buckle joints, slotting tools, operation wellhead tools and the like, arranging ground equipment, connecting flow pipelines, testing pressure and preparing for starting.
5) Replacing well killing liquid;
the oil pipe (1 m of the lifting pipe column is lifted up to the bottom of the well, the well is washed by using the well washing liquid with the density of 1.02g/cm < 3 > at the discharge capacity of 1m < 3 >/min until the inlet and outlet are consistent;
6) Connecting a hydraulic slotting tool assembly, connecting a downhole tool according to a tubular column structure table, and tightening a connecting screw thread according to torque strength provided by a tool instruction book, wherein the torque of the downhole tool is not more than 2,300FT LBS, and the screwing torque of a spray gun is 1500FT LBS;
7) After the underground tool string is connected, lowering the BHA to the shaft;
8) Measuring and recording the sizes of all tools, including the inner diameter, the outer diameter and the length, compiling a well string data table, and submitting field supervision and verification;
9) Connecting process pipelines, testing the pressure of a high-pressure process (a high-pressure pump truck-a high-pressure manifold), and stabilizing the pressure for 5min;
10 The pump is started to be filled with water, and the downhole tool is tested to confirm that the flushing head and the spray gun are normally discharged.
2. Hydraulic slotting construction
1) The hydraulic slotting tool assembly is put into the well to the target depth;
2) Magnetic positioning depth correction;
3) Performing slotting construction;
ball (9.4 mm steel ball) was thrown to plug the bottom flushing ball seat, then high pressure pumping line was connected to 0.25m 3 The ball is circularly delivered in the speed of/min (1.5 bpm) when the ball leaves the bottomWhen the discharge amount is within 60 meters, the discharge amount is reduced to 0.1m 3 /min(0.8bpm)；
After the ball is seated, the ground shows that the pressure rises, and the construction is started according to a pumping program table;
the pressure change of ground construction is closely noted during construction, and the pumping program can be timely adjusted according to the site conditions;
4) Layer-changing slotting, lifting the oil pipe for N meters, reducing the discharge capacity until the ground pressure is less than 500psi, rebounding the power stroke of a slotting tool, recovering the pumping discharge capacity, continuously executing a pumping program table, uniformly completing the slotting construction of the whole section of reservoir, accumulating the lifting oil pipe for 6 times, and completing 7-layer slotting construction;
5) Cleaning sand and washing a well;
lifting the downhole tool, and setting a sand washing pipe column to clean accumulated sand in a shaft;
6) Acidification (optional)
Closing a sleeve gate, injecting corrosion inhibition acid, and performing general acidification;
7) Monitoring pumping pressure during construction;
8) The construction pumping procedure can be properly adjusted according to the site construction process.
3. Ground equipment flow arrangement
As shown in fig. 25 and 26, power equipment is arranged according to the equipment list, slick water from a water tank and propping agent are mixed by a sand mixer, pressurized by a high-pressure pump truck and pumped into a slotting tool to realize underground slotting, and slotting liquid returned from an annulus is filtered and desanding and then returned to a sewage tank.
And (3) carrying out hydraulic slotting in the oil well, wherein the slotting size is 2-6cm long and 1cm wide.
The mechanism of increasing yield and injection of the hydraulic slotting is as follows:
(1) Releasing the dense ring around the shaft: and the permeability of the near-well zone is improved.
Tangential stress in oil wells:
radial permeability in oil well:
based on the above formula, if the simulated oil well parameters are: depth 1000m; young's modulus 10Gpa; poisson's ratio 0.3; the horizontal ground stress is 12Mpa, the well peripheral stress field is readjusted after slotting, the permeability is obviously improved, as shown in fig. 1 and 2, the ground stress is reduced, and the permeability is improved.
(2) Purge well Zhou Wuran: and the permeability of the near-well zone is improved.
As shown in fig. 3 and 4, a hydraulic knife is used for cutting a plurality of cracks near a shaft, so that the pollution around the shaft is removed, and the blockage of stratum around the shaft is relieved;
preferably, the well perimeter contamination and formation plugging consists essentially of: water sensitivity damage, particulate migration damage, scaling damage, solid phase particle intrusion damage, and water lock damage.
(3) Changing the seepage state of the fluid and increasing the seepage area of the oil gas in the stratum.
The hydraulic slotting can cut a long seam with the depth of 1.5m in the stratum, so that the oil drainage area is greatly increased; the well Zhou Yingli is changed, micro-cracks are formed around the slotted surface, and the oil drainage area is increased.
The hydraulic slotting is compared with the conventional perforation, and the hydraulic slotting has the following advantages:
1) Area of opening on the sleeve using mobile hydraulic injection technique: 10mm x 20mm x 6 = 1200mm 2 ；
Opening area of standard initiating explosive device perforations on casing (16 holes per meter): 10mm x 3.14/4 x 16 = 1256mm 2 ；
From the calculation of the open area on the sleeve alone:
the 6 moving hydraulic jets of 2cm length correspond to the use of conventional initiating explosive perforation 1m.
Thus, if 3 sections are slit in the length range of 1 meter, the open area on the 1 meter sleeve is 3 times the perforation area of 1 meter.
2) 6 seam formation drainage area with a cluster depth of 1.2 meters: substantial elevation of drainage area 1200mm x 50mm x 2 x 6 = 720000mm2.8-1/2 "open hole perforations per meter drainage area 215.9mm x 3.14 x 1000mm = 677926mm 2 ；
The transformation effect of 5cm of primary slotting is equivalent to that of an open hole section of 1.2m, such as slotting 3 sections within the length range of 1.2m, and the stratum drainage area of the hydraulic slotting is 3 times of that of the conventional perforation drainage area.
3) Accurate positioning and controllable transformation. The thin layer which is difficult to implement by other measures can be accurately transformed after one-time well descending, the water layer is avoided, and the seam width is controlled.
Length of controllable hydraulic slit: 2-6cm.
4) The depth of the stratum is large, and the seepage area of the stratum is greatly increased;
because of the mobile slow cutting process, the cutting time is typically 1-2 hours, so there is no compacted contaminated zone of conventional perforation instant detonation.
Conventional 1.5m deep into stratum, such as adding nitrogen for cutting, the depth can reach 15-20 m.
5) For conventional sandstone with relatively developed pores, the original stress field is adjusted after slotting, and a low tensile stress area is formed around the well, so that the compacted zone rock stratum is loosened and generates new cracks, and the influence radius reaches more than ten meters.
6) The travel is movable type slow cutting, the travel movement is hardly seen on the ground, the ball throwing excitation liquid cavity moves, the whole cutting pipe column is not moved, the phenomenon that other domestic cutting pipe columns move up and down to cause uneven cutting stratum and casing is avoided, and the casing strength is damaged.
The implementation method of the directional hydraulic slotting function comprises the following steps:
utilizing a universal rotary nipple and a counterweight nipple;
the water nozzle which does not need to be cut is blocked on the ground.
Preferably, the site operation can be operated by oil pipes or continuous oil pipes, and the ground is matched with 1 sand mixing sled and 1-2 700 pump trucks.
As shown in fig. 7 to 9, the application of the movable hydraulic jet in the conventional sandstone modification has obvious effect of increasing yield and injection, and meanwhile, the effect duration is long, so that obvious economic benefit is brought.
Example 1
In conventional sand mudstones in california and texas in the united states, the exploratory well low cost modifications and the old well unblocking recovery capacity are performed in the conventional reservoir, and specific data of the old well unblocking recovery capacity are shown in the following table one, and specific data of the exploratory well low cost modifications are shown in the following table two.
List one
Watch II
Example two
As shown in fig. 5 and 6, a test well is compared with a temporary well, and on the premise of the same horizontal section length, the same sand adding amount and liquid amount of the horizontal section of unit length, the fracture pressure is reduced by using a fracture fracturing and sitting technology, and the single well productivity is improved.
The results after 120 days are as follows: the burst pressure was reduced by 17 mpa; 26% yield increase; no influence on the well completion efficiency; zero sand blocking.
The method reduces the damage and increases the yield, improves the effectiveness of fracturing modification, and improves the yield of clients by 26% by adopting the movable hydraulic jetting and bridge plug sitting fracturing technology.
Example III
As shown in fig. 10 and 11, in the high temperature and high pressure region of the wilston shale, the productivity is improved
The depleted, previously fractured well is stimulated. Selecting a horizon with good physical properties in a horizontal section, reducing the cracking pressure by using mobile hydraulic jetting, and manufacturing a contact area to realize effective repeated fracturing; and successfully realizing 13-grade secondary fracturing.
45 days after pressing: by calculating the production index, the PI rises by 600% after repeated fracturing; the slotted fracturing and sitting technique promotes the production increase of horizontal shale oil and gas wells with depleted productivity.
Example IV
As shown in fig. 12 and 13, the blockage of one production well inspection pump causes no liquid outlet, acidification and liquid extrusion are carried out sequentially, three-stage mobile hydraulic injection construction is carried out on the basis of the day 11 and 9 in 2018, the construction discharge capacity is 1.2, the sand ratio is 5%, the construction pressure is 31 mpa, the single-stage slotting time is 50 minutes, and a large amount of crude oil is found to return to a wellhead on the slotting construction day. After draining for 7 days, the liquid level is stable, the daily liquid yield is 31 times higher than that in the initial stage of production, the daily oil yield is 17.4 times higher than that before operation.
Example five
As shown in fig. 14 and 15, a key well reservoir is hypotonic, a block well is difficult to inject, the oil well is insufficient in liquid supply, a client is recommended to perform movable hydraulic slotting on a 1397.9-1406.3m reservoir, the slotting depth and the oil drainage area are increased, the pollution of drilling liquid near the well is relieved, an oil flow channel is increased, and the liquid supply and oil production capacity is improved.
And performing three-stage mobile hydraulic jet construction, wherein the construction displacement is 0.8 square, the sand ratio is 5%, the construction pressure is 27.5 megapascals, the single-stage slotting time is 50 minutes, and a large amount of crude oil is found to return to the wellhead after slotting construction is finished. After 13 days of drainage, the liquid level is stable, the daily oil yield is 8, the daily oil yield is 6.4, and the oil yield is 4 times of the average single well yield of the block.
Example six
As shown in fig. 16, the reservoir in an oil area is low in low pressure and low in permeability, the oil well is insufficient in liquid supply, the micro-displacement mobile hydraulic slotting of the reservoir of 2512.0-2516.2m is recommended by customers, the slotting depth and the oil drainage area are improved, the pollution of drilling liquid near the well is relieved, the oil flow channel is increased, and the liquid supply and oil production capacity is improved.
And carrying out two-stage mobile hydraulic jet construction, wherein the construction displacement is 0.8 square, the sand ratio is 5%, the construction pressure is 27.5 megapascals, the single-stage slotting time is 50 minutes, and a large amount of crude oil is found to return to the wellhead after slotting construction is finished. After the liquid is hung, the liquid level is stable, the daily liquid yield is 5.9, the daily oil yield is 3.4, and the oil yield is 7 times of the average single well yield of the block.
Example seven
As shown in fig. 17 to 22, the first section of the pumping bridge plug of the oil well cable is successfully constructed, the second section is blocked at 2293m, the pumping capacity is increased to 3m3/min, and the construction of the remaining section is decided by adopting a continuous oil pipe as a bridge plug and a movable hydraulic jetting continuous sitting process. The technique aims to ensure the running-in of the bridge plug, reduce the fracture pressure and ensure the smooth running of the fracturing measures of the remaining well sections.
The oil well is subjected to bridge plug sealing mobile hydraulic jet fracturing and sitting construction, six groups of slots are formed at each stage, the length of six spiral six slots of each group is 3cm, and the fracturing construction displacement is 12-14m 3 And/min, the formation fracture pressure is obviously reduced, and the whole-well fracturing construction is carried out along the way.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A mobile hydraulic slotting technique, comprising: carrying out hydraulic slotting in an oil well, wherein the slotting size is 2-6cm long and 1cm wide;
the mechanism of increasing yield and injection of the hydraulic slotting is as follows:
a. releasing the dense ring around the shaft: the permeability of the near-well zone is improved;
tangential stress in oil wells:
radial permeability in oil well:
based on the above formula, if the simulated oil well parameters are: depth 1000m; young's modulus 10Gpa; poisson's ratio 0.3; the horizontal ground stress is 12Mpa, the well peripheral stress field is readjusted after slotting, the permeability is obviously improved, the ground stress is reduced, and the permeability is improved;
b. purge well Zhou Wuran: the permeability of the near-well zone is improved;
cutting a plurality of cracks near a shaft by using a hydraulic knife, removing pollution around the shaft, and removing blockage of stratum around the shaft;
c. changing the seepage state of the fluid and increasing the seepage area of the oil gas in the stratum;
the hydraulic slotting can cut a long seam with the depth of 1.5m in the stratum, so that the oil drainage area is greatly increased;
the well Zhou Yingli is changed, micro-cracks are formed around the slotted surface, and the oil drainage area is increased.
2. A mobile hydraulic fracturing technology according to claim 1, wherein said well-surrounding formation contamination and formation plugging mainly comprises: water sensitivity damage, particulate migration damage, scaling damage, solid phase particle intrusion damage, and water lock damage.
3. A mobile hydraulic slotting technique according to claim 1, wherein the advantages of hydraulic slotting include:
firstly, the hydraulic slotting opening area is large;
secondly, the hydraulic slotting leakage area is large;
thirdly, accurate reconstruction and controllability of hydraulic slotting positioning are realized;
fourthly, the depth of the hydraulic slotting cutting stratum is large, and the seepage area of the stratum is increased;
fifth, hydraulic kerf altering well Zhou Yingli
Sixth, the hydraulic slotting is stroke-moving type slow cutting, and cutting is uniform.
4. A mobile hydraulic slotting technique according to claim 3, wherein,
the hydraulic slotting opening area is large, and the hydraulic slotting opening area is specifically as follows:
area of opening on the sleeve using mobile hydraulic injection technique: 10mm x 20mm x 6 = 1200mm 2 ；
Opening area of standard initiating explosive device perforations on casing (16 holes per meter): 10mm x 3.14/4 x 16 = 1256mm 2 ；
From the calculation of the open area on the sleeve alone:
6 mobile hydraulic jets of 2cm length are equivalent to 1m perforated by conventional firers;
3 sections are cut in the length range of 1 meter, and the open area of the 1 meter sleeve is 3 times of the perforation area of the 1 meter.
5. A mobile hydraulic slotting technique according to claim 4, wherein,
the hydraulic slotting leakage area is large, and the hydraulic slotting leakage area is specifically as follows:
6 seam formation drainage area with a cluster depth of 1.2 meters: substantial elevation of drainage area 1200mm x 50mm x 2 x 6 = 720000mm2.8-1/2 "open hole perforations per meter drainage area 215.9mm x 3.14 x 1000mm = 677926mm 2 ；
The transformation effect of one-time slotting of 5cm is equivalent to that of an open hole section of 1.2m, 3 sections are slotted within the length range of 1.2m, and the stratum drainage area of the hydraulic slotting is 3 times of that of the conventional perforation drainage area.
6. A mobile hydraulic slotting technique according to claim 5, wherein,
the hydraulic slotting positioning is accurate and controllable, and is concretely as follows:
the thin layer which is difficult to implement by other measures can be accurately transformed after one-time well descending, the water layer is avoided, the seam width is controlled, and the length of the hydraulic cutting seam is controllable: 2-6cm.
7. A mobile hydraulic slotting technique according to claim 6, wherein,
the hydraulic slotting cutting stratum depth is large, the stratum seepage area is increased, and the hydraulic slotting cutting stratum depth is specifically as follows:
a mobile slow cutting process, the cutting time is usually 1-2 hours, so that a compaction pollution zone of conventional perforation instant explosion does not exist; conventional 1.5m deep into stratum, such as adding nitrogen for cutting, the depth can reach 15-20 m.
8. A mobile hydraulic slotting technique according to claim 7, wherein,
the hydraulic kerf altering well Zhou Yingli is specifically as follows:
for conventional sandstone with relatively developed pores, the original stress field is adjusted after slotting, and a low tensile stress area is formed around the well, so that the compacted zone rock stratum is loosened and generates new cracks, and the influence radius reaches more than ten meters.
9. A mobile hydraulic slotting technique according to claim 1, wherein,
the hydraulic slotting is stroke-movable slow cutting, and the cutting is uniform, and is specifically as follows:
the travel is movable type slow cutting, the travel movement is hardly seen on the ground, the ball throwing excitation liquid cavity moves, the whole cutting pipe column is not moved, the phenomenon that other domestic cutting pipe columns move up and down to cause uneven cutting stratum and casing is avoided, and the casing strength is damaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310232666.9A CN116771312A (en) | 2023-03-13 | 2023-03-13 | Mobile hydraulic slotting technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310232666.9A CN116771312A (en) | 2023-03-13 | 2023-03-13 | Mobile hydraulic slotting technology |
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| Publication Number | Publication Date |
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| CN116771312A true CN116771312A (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310232666.9A Withdrawn CN116771312A (en) | 2023-03-13 | 2023-03-13 | Mobile hydraulic slotting technology |
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| Country | Link |
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| CN (1) | CN116771312A (en) |
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- 2023-03-13 CN CN202310232666.9A patent/CN116771312A/en not_active Withdrawn
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Application publication date: 20230919 |