CN111255428A - Casing horizontal well shaft reconstruction repeated fracturing method - Google Patents
Casing horizontal well shaft reconstruction repeated fracturing method Download PDFInfo
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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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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Abstract
The invention discloses a casing horizontal well shaft rebuilding repeated fracturing method. The method comprises the following steps: an oil pipe or a drill pipe column with a drift gauge is put into a casing of the casing horizontal well and is communicated to the bottom of the artificial well; an oil pipe or a drill pipe column with a scraper is put into a casing of the casing horizontal well, and repeatedly passes through the perforation cluster for many times, and chips are circulated out by adopting a water-based fracturing fluid base fluid; an oil pipe or a drill pipe column with an upper Y341 packer, a lower Y341 packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead plug and a pressure guide sand blower is arranged in a casing of the casing horizontal well, and the pressure guide sand blower is arranged between the two Y341 packers; aligning the pressure-guiding sand blower to the position of a perforation cluster, setting a packer, and squeezing and injecting sealing slurry into the perforation cluster; after the sealing slurry is solidified, conventional multi-cluster perforation volume fracturing and high-density perforation seam volume control fracturing multi-stage fracturing operation is carried out. The invention can realize fixed-point reconstruction and has the characteristic of high construction efficiency.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a casing horizontal well shaft reconstruction repeated fracturing method.
Background
Staged fracturing of horizontal wells is an effective way to improve the single well yield of oil and gas reservoirs. However, as the development is gradually deepened, due to the influence of factors such as low transformation degree of primary fracturing, reduction of flow conductivity of a fracture system and the like, part of low-production horizontal wells appear, the yield of a single well needs to be recovered by adopting repeated fracturing, and the development effect is improved. The horizontal well repeated fracturing technology is difficult due to factors such as primary fracturing multi-section perforation, uneven extraction degree between sections, large difference of horizontal section cementing quality and the like, and the targeted process technology is still in an exploration test stage. At present, the horizontal well repeated fracturing process at home and abroad mainly comprises two types: the first is a mechanical packing repeated fracturing process, which has the advantages that a pipe column and a packer are adopted to clamp and seal a target well section, fixed-point reconstruction is realized through oil pipe injection, and the defects are that a running pipe string drags operation, the requirement on shaft conditions is high, the operation is influenced by the inner diameter of the pipe column, and the large-scale fracturing construction efficiency is low (only 1 section is constructed by a single pipe column). The second type is a dynamic multistage temporary plugging repeated fracturing process, which has the advantages of optical casing operation, lower requirement on a shaft, realization of intersegmental steering fracturing by pumping and injecting temporary plugging agents through a wellhead, high construction efficiency, and the defects of incapability of fixed-point reconstruction and poor multistage temporary plugging boosting controllability (the boosting amplitude of the 1 st stage is more than 5MPa, and the boosting amplitude is smaller later), so that the reservoir reconstruction has uncertainty.
Disclosure of Invention
The invention aims to provide a casing horizontal well shaft reconstruction repeated fracturing method, which can realize fixed-point reconstruction and has the characteristic of high construction efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a cased horizontal wellbore reconstruction refracturing method, comprising:
an oil pipe or a drill pipe column with a drift gauge is put into a casing of the casing horizontal well and is communicated to the bottom of the artificial well;
an oil pipe or a drill pipe column with a scraper is arranged in a casing of the casing horizontal well, the casing is repeatedly passed through a perforation cluster for many times, and water-based fracturing fluid base fluid is adopted to circulate out fragments; the number of times of repeatedly passing through the perforation cluster can be manually set according to the requirement;
an oil pipe or a drill pipe column with an upper Y341 packer, a lower Y341 packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead plug and a pressure guide sand blower is arranged in the casing of the casing horizontal well, and the pressure guide sand blower is arranged between the two Y341 packers;
aligning the position of a pressure-guide sand blower to the position of a perforation cluster, setting a packer, injecting slick water, testing the water absorption condition of the perforation cluster, directly extruding and injecting sealing slurry if the water absorption is good, starting a fracturing pump truck to press open the perforation cluster if the water absorption is poor or no water absorption is generated, and extruding and injecting the sealing slurry; displacing the sealing slurry to a set depth inside the artificial crack; the set depth can be manually set according to needs;
and after the sealing slurry is solidified, carrying out conventional multi-cluster perforation volume fracturing and high-density perforation seam volume control fracturing multi-stage fracturing operation.
Optionally, after the curing of the sealing slurry, before performing a conventional multi-cluster perforation volume fracturing and high-density perforation volume control fracturing multi-stage fracturing operation, the method further includes:
and (2) putting an oil pipe or a drill pipe column with a scraper into the casing of the casing horizontal well, repeatedly passing through the whole shaft from bottom to top for many times, and circulating the water-based fracturing fluid base fluid to obtain fragments.
Optionally, after the curing of the sealing slurry, before performing a conventional multi-cluster perforation volume fracturing and high-density perforation volume control fracturing multi-stage fracturing operation, the method further includes:
and (3) putting an oil pipe or a drill pipe column with a drift size gauge into the casing of the casing horizontal well, and leading the oil pipe or the drill pipe column to the bottom of the artificial well.
Optionally, after the curing of the sealing slurry, before performing a conventional multi-cluster perforation volume fracturing and high-density perforation volume control fracturing multi-stage fracturing operation, the method further includes:
and using a water-based fracturing fluid base fluid, and carrying out integral pressure test on the casing pipe at the whole well section of the casing horizontal well by adopting a fracturing truck group to determine whether the casing horizontal well is qualified.
Optionally, after the conventional multi-cluster perforation volume fracturing and high-density perforation volume-controlled fracturing multi-stage fracturing operation is performed, the method further includes:
using a coiled tubing to carry an electric motor and a drill bit, drilling and grinding a drift well to the bottom of the well, and circulating water-based fracturing fluid base fluid out of bridge plug scraps;
and dragging the pump by using a coiled tubing to inject a special degrading agent, so that the solidified slurry in the casing horizontal well is hydrated to realize the joint production of new and old fracturing fractures.
Optionally, the sealing slurry comprises a sealing agent and water, and the sealing agent comprises calcium sulfoaluminate hydrate, gypsum, calcium oxide and magnesium oxide.
Optionally, the particle size distribution of the sealing agent is 8-2500 meshes, and the density is 3.15-3.20g/cm3。
Optionally, the apparent viscosity of the sealing slurry is 25-85mPa · s, and the fluidity is 17-27 cm.
Optionally, the degradation agent comprises potassium permanganate or sodium persulfate.
Optionally, before the tubing or drill pipe string with a drift gauge is lowered into the casing of the casing horizontal well, the method further comprises:
performing repeated fracturing potential analysis on the casing horizontal well by using the geological characteristics of the regional structure, the reservoir characteristics, the single well control reserve and the previous extraction degree as analysis parameters; wherein the reservoir characteristics comprise logging characteristics and tectonic sedimentary characteristics, reservoir longitudinal and transverse distributions, three-dimensional stress states, natural fracture development conditions, and dessert interlayer distributions, the dessert interlayer distributions comprising reservoir dessert distribution characteristics and interlayer distribution characteristics; the single well controlled reserves include hydrocarbon-bearing area, hydrocarbon layer thickness, effective porosity, crude oil natural gas density, hydrocarbon saturation, and volume factor.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a casing horizontal well shaft reconstruction repeated fracturing method, wherein an oil pipe or a drill pipe column with an upper Y341 packer, a lower Y packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead plug and a pressure guide sand blower is arranged in a casing of a casing horizontal well, wherein the pressure guide sand blower is arranged between the two Y341 packers; aligning the position of a pressure-guide sand blower to the position of a perforation cluster, setting a packer, injecting slick water, testing the water absorption condition of the perforation cluster, directly extruding and injecting sealing slurry if the water absorption is good, starting a fracturing pump truck to press open the perforation cluster if the water absorption is poor or no water absorption is generated, and extruding and injecting the sealing slurry; and displacing the sealing slurry to a set depth inside the artificial crack; after the sealing slurry is solidified, conventional multi-cluster perforation volume fracturing and high-density perforation seam volume control fracturing multi-stage fracturing operation is carried out. Compared with the prior art, the invention can finish the slurry injection of the perforation clusters of all well sections in a single tubular column, improves the construction efficiency, and realizes the fixed-point reconstruction by adopting the pressure-guiding sand blower to directly aim at the perforation clusters for slurry extrusion injection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a casing horizontal well bore re-fracturing method in an embodiment of the invention;
FIG. 2 is a block diagram of a completion string in an embodiment of the present invention;
FIG. 3 is a diagram of a configuration location in which a well completion is located in an embodiment of the present invention;
FIG. 4 is a pictorial view of a squeeze string being run in a cased horizontal well in accordance with an embodiment of the present invention;
FIG. 5 is a pictorial view of a cementing slurry pumped into a cased horizontal well in accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram of an interpenetrating network structure formed by the mounting slurry in an embodiment of the present invention;
FIG. 7 is a schematic representation of a partially amorphous hydrated product after erosion in an embodiment of the invention;
FIG. 8 is a schematic representation of a fibrous CSH gel in an embodiment of the present invention;
FIG. 9 is a schematic diagram of the self-healing action in an embodiment of the present invention;
FIG. 10 is a graph showing the results of temperature resistance tests of the mounting slurries of the examples of the present invention;
FIG. 11 is a graph showing the results of a swelling test of a mounting slurry according to an embodiment of the present invention;
FIG. 12 is a graph showing the results of a salt resistance test of the mounting slurry according to the example of the present invention;
FIG. 13 is a graph of the strength of the sealant under certain oilfield conditions in an embodiment of the present invention;
FIG. 14 is a pictorial view of an embodiment of the present invention in which the consolidation slurry is uniformly distributed within the fractures created by each perforation cluster;
FIG. 15 is a pictorial view of a fracturing operation in an embodiment of the present invention;
FIG. 16 is a pictorial view of a pump-injected degradation agent in an embodiment of the present invention;
FIG. 17 is a diagram of a real object of the present invention in which the sealing slurry is liquefied and the run-in string is extracted for co-production of new and old fractured zones.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the casing horizontal well wellbore rebuilding repeated fracturing method provided by the invention comprises the following steps:
step 101: an oil pipe or a drill pipe column with a drift gauge is put into a casing of the casing horizontal well and led to the bottom of the artificial well, and whether a deformation point exists in the drift diameter in the casing is detected;
step 102: an oil pipe or a drill pipe column with a scraper is arranged in a casing of the casing horizontal well, the casing is repeatedly passed through a perforation cluster position for many times, and water-based fracturing fluid base fluid is adopted to circulate out fragments until the properties of an inlet and an outlet are consistent, so that the drift diameter in the casing is ensured to be not deformed;
step 103: an oil pipe or a drill pipe column with an upper Y341 packer, a lower Y341 packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead plug and a pressure guide sand blower is arranged in the casing of the casing horizontal well, and the pressure guide sand blower is arranged between the two Y341 packers;
step 104: aligning the position of a pressure-guiding sand blower to the position of a perforation cluster, setting a packer, injecting slick water at a small displacement, testing the water absorption condition of the perforation cluster, directly extruding and injecting sealing slurry if the water absorption is good, starting a fracturing pump truck if the water absorption is poor or no water absorption indicates that the perforation cluster is not pressed open in one-time fracturing, pressing open the perforation cluster, forcibly extruding and injecting the sealing slurry, displacing the sealing slurry to 3 meters inside the original artificial fracture (calculating the distance from the inner wall of a casing) in a slight excess manner, stopping the pump for 30 minutes, filling the horizontal well section perforation cluster blastholes and the 3-meter-time fracturing fractures around a shaft with the special retention characteristic of the sealing slurry, and displacing the principle that no slurry is left in the casing; lifting the deblocking pipe column, repeating the blocking steps for each perforation cluster, completing squeezing and injecting blocking slurry of all perforation clusters in the horizontal well section of the casing pipe, and then closing the well to wait for the slurry to be completely cured;
wherein, preferably, the sealing slurry comprises a sealing agent and water, and the sealing agent comprises calcium sulphoaluminate hydrate, gypsum, calcium oxide and magnesium oxide. Preferably, the particle size distribution of the sealing agent is 8-2500 meshes, and the density is 3.15-3.20g/cm3. Preferably, the sealing slurry has an apparent viscosity of 25 to 85 mPas and a fluidity of 17 to 27 cm. The oil pipe in the invention can be selected from 27/8"tubing.
Step 105: and after the sealing slurry is solidified, carrying out conventional multi-cluster perforation volume fracturing and high-density perforation seam volume control fracturing multi-stage fracturing operation.
In the above embodiment, step 105 may further include, after the curing of the sealing slurry and before the performing of the conventional multi-cluster perforation volume fracturing, high-density perforation volume control fracturing multi-stage fracturing operation:
and (2) setting an oil pipe or a drill pipe column with a scraper in the casing of the casing horizontal well, repeatedly passing the whole shaft from bottom to top for many times, and circulating the water-based fracturing fluid base fluid to remove fragments until the properties of the inlet and the outlet are consistent, so as to ensure that no residue exists in the solidified body of the sealing slurry in the casing.
In the above embodiment, step 105 may further include, after the curing of the sealing slurry and before the performing of the conventional multi-cluster perforation volume fracturing, high-density perforation volume control fracturing multi-stage fracturing operation:
and (3) putting an oil pipe or a drill pipe column with a drift gauge into the casing of the casing horizontal well, and leading the oil pipe or the drill pipe column to the bottom of the artificial well, so as to realize the existence of foreign matters in the drift diameter in the casing.
In the above embodiment, step 105 may further include, after the curing of the sealing slurry and before the performing of the conventional multi-cluster perforation volume fracturing, high-density perforation volume control fracturing multi-stage fracturing operation:
using water-based fracturing fluid base fluid, carrying out integral pressure test on the casing pipe at the whole well section of the casing horizontal well by adopting a fracturing truck group, and determining whether the casing horizontal well is qualified or not: the pressure is stabilized for 120 minutes under the pressure of 100MPa, and the pressure drop is qualified when the pressure drop is not more than 0.5 MPa.
In the above embodiment, step 105 further comprises, after the performing the conventional multi-cluster perforation volume fracturing, high-density perforation volume controlled fracturing multi-stage fracturing operation:
after the obtained horizontal shaft is fractured and the well is closed for 15 days, using a coiled tubing to carry an electric motor and a drill bit, drilling and grinding the well to the bottom of the well, and simultaneously adopting water-based fracturing fluid base fluid to circulate out bridge plug fragments;
and dragging the pump by using a coiled tubing to inject a special degrading agent, so that the solidified slurry in the casing horizontal well is hydrated to realize the joint production of new and old fracturing fractures. Preferably, 0.2 tons of degradant is pumped per 100 cubes of the mounting slurry.
Wherein, preferably, the degradation agent comprises potassium permanganate or sodium persulfate.
In the above embodiment, before step 101, the method may further include:
performing repeated fracturing potential analysis on the casing horizontal well by using the geological characteristics of the regional structure, the reservoir characteristics, the single well control reserve and the previous extraction degree as analysis parameters; wherein the reservoir characteristics comprise logging characteristics and tectonic sedimentary characteristics, reservoir longitudinal and transverse distributions, three-dimensional stress states, natural fracture development conditions, and dessert interlayer distributions, the dessert interlayer distributions comprising reservoir dessert distribution characteristics and interlayer distribution characteristics; the single well controlled reserves include hydrocarbon-bearing area, hydrocarbon layer thickness, effective porosity, crude oil natural gas density, hydrocarbon saturation, and volume factor.
Preferably, the recoverable reserves of the horizontal wells are calculated according to the Arps yield decreasing method during the repeated fracturing potential analysis.
Preferably, the residual oil-gas distribution rule of the horizontal well is analyzed by adopting a reservoir engineering yield splitting method during the repeated fracturing potential analysis.
Preferably, the ground pressure of a wellhead is not higher than 95MPa in the multi-stage fracturing operation of the conventional multi-cluster perforation volume fracturing and high-density perforation volume control fracturing.
The invention is explained below by way of example:
the well number is as follows: JY4HF well: evaluation well
The completion method and data are shown in table 1:
TABLE 1 well completion methods and data
Actually drilling the track of the borehole:
drilling to reach the target A in 19 days 10 months in 2013, wherein the actual drilling A target has the well depth of 2781.00m, the well deviation of 81.63 degrees, the azimuth of 216.71 degrees, the vertical depth of 2607.00m and the closure distance of 387.03 m; drilling to reach a target point B in 10 months and 24 days in 2013, wherein the well depth is 3981.00m, the well deviation is 84.2 degrees, the azimuth is 216.71 degrees, the vertical depth is 2691.11m, and the closing displacement is 1583.47 m; and (3) completing drilling in 2013, 10 and 25 days until the well depth is 4006.00m, wherein the well bottom well deviation is 84.5 degrees, and the azimuth is as follows: 216.71 °, vertical depth 2693.56m, closing displacement: 1608.35 m.
The completion string configuration is shown in FIG. 2, the completion site is shown in FIG. 3, the casing program is shown in Table 2, the comprehensive log interpretation is shown in Table 3, the mineral content is shown in Table 4, the rock mechanical parameters are shown in Table 5, and the rock ground stress is shown in Table 6.
TABLE 2 casing procedure
TABLE 3 comprehensive interpretation of well logs
TABLE 4 mineral content
TABLE 5 rock mechanics parameters
TABLE 6 rock ground stress
Natural fracture characteristics:
the cracks of the shale sections of the adjacent well JY1HF well Wufeng group-Longmaxi group do not develop, the shale sections are rich in organic substances, the horizontal bedding is very developed, the micro bedding surface and the interlaminar seam of the shale commonly develop, the interlaminar seam and the micro bedding surface can be understood as deposition discontinuities in the layer, the shale sections have relatively good permeability, and in the process of the core immersion test of the JY1HF well Wufeng group-Longmaxi group, the common rice grain-needle point-shaped bubbles continuously overflow from the core bedding surface and are in a water curtain shape, so that the horizontal bedding seam of the shale provides good storage space for shale gas stripping.
Primary fracturing condition:
completing the 15-section fracturing of the well in 2013 from 12 months and 15 days to 12 months and 22 days:
the segmenting tool is a ball cage type drillable composite fracturing bridge plug;
the well reconstruction section 2781-3981m has a length of 1200m, and is divided into 15 sections, wherein the length of a single section is 51-91m, and the average length is 80 m;
each section of 2-3 clusters (the first two sections of 2 clusters) of perforation is 1.0-1.5 m/cluster, 60-degree phase angle, 20 holes/m, total number of holes is 60 holes, and aperture is 9.5 mm;
the cluster spacing is 20-33.5m, and the average is 26.9 m; wherein the interval between the cluster segments is 19-36m, and the average is 25.9 m; the cluster spacing in the segment is 25-33.5m, and the average is 30.0 m.
JY4HF well is put into production in 2013, 12 and 31 days, before the repression is stopped, the sleeve pressure is 2.67MPa, the daily produced gas is 2.2542 multiplied by 104m3. Accumulated produced gas 6917.3038X 104m36843.8178m of produced water3The flowback rate is 14.3%.
And (3) analysis and recognition:
the average porosity of the horizontal section is 5.1%, the TOC is 3.1%, and the drilling rate of the I-type reservoir is 90.8%, which indicates that the physical property foundation of the reservoir is better.
The distance between the primary fracturing clusters is 20-33.5m, the average distance is 26.9m, and the cluster distance is too large; the main body displacement is 12.2-14.0m3Min, low discharge capacity; average single-stage liquid volume 1572.7m3Single segment sand amount 45m3The sand liquid scale is smaller; the horizontal bedding joint development stratum low-viscosity slippery water bursting crack breaking capacity is low, and the longitudinal modification effect of the reservoir is limited; the joint network reconstruction of the primary fracturing is limited in volume and insufficient in reservoir reconstruction due to the combination of the two aspects.
The sand adding difficulty of 7 construction stages in total of the 1/2/3/6/8/10/14 th stage of primary fracturing (the average sand amount of a single stage is only 16.5 m)3) These several reservoir modifications are particularly inadequate.
The gas production section shows that the gas production difference between sections and clusters is very obvious, even 41.9 percent of perforation clusters do not produce gas, the early-stage modification is reflected to be not uneven, and a larger proportion of reservoir layers are not fully modified.
The gas production effect after primary fracturing is not ideal, and according to the previous analysis, the well has the potential of repeated fracturing reconstruction. The repeat fracture potential analysis is shown in table 7:
TABLE 7 repeat fracturing potentials
And selecting the bottom temperature range of the casing horizontal well to be 90-100 ℃.
The model of the existing horizontal section casing of the old well is 51/2“。
2, arranging an upper Y341 packer, a lower Y packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead block and a pressure guide sand blower in the existing casing of the selected casing horizontal well7/8"tubing or drillpipe string" with the lead pressure sandblaster placed between two Y341 packers, the physical diagram is shown in FIG. 4.
Aligning the position of a pressure-guiding sand blower to the position of an original first perforation cluster, setting a packer, injecting slick water at a small displacement, testing the water absorption condition of the perforation cluster, directly extruding and injecting sealing slurry if the water absorption is good, and replacing the sealing slurry to 3 meters inside an original artificial crack (calculating the distance from a sleeve blasthole) by a small excess amount after the sealing slurry is stopped for 30 minutes by starting a fracturing pump truck if the water absorption condition of the perforation cluster is not pressed open, pressing open the perforation cluster, forcibly extruding and injecting the sealing slurry, and filling the sealing slurry into the horizontal well section perforation cluster blasthole and the 3 meters of primary fracturing cracks around a shaft by the aid of the small excess amount, wherein the replacement amount is based on the principle that no slurry is left in the sleeve; lifting the deblocking pipe column, repeating the blocking steps for each perforation cluster, completing squeezing and injecting blocking slurry of all perforation clusters of the casing horizontal well section, then closing the well and waiting for the complete solidification of the slurry, wherein the slurry comprises a blocking agent and water, and the blocking agent comprises calcium sulphoaluminate hydrate, gypsum, calcium oxide and magnesium oxide; a 2 with a scraper is put into the casing of the casing horizontal well after the selected sealed perforation cluster7/8The whole shaft of the oil pipe or the drill pipe column repeatedly passes through the oil pipe or the drill pipe column from bottom to top for three times, and meanwhile, chips are recycled by using a water-based fracturing fluid base fluid until the inlet and outlet fluids are consistent, so that no residue of a solidified body of sealing slurry in the casing is ensured; setting 2 with drift gauge in the casing of the casing horizontal well after the selected sealed perforation cluster7/8An oil pipe or a drill pipe column is led to the bottom of an artificial well, and the drift diameter in the cast-in-place casing has no foreign matter; using water-based fracturing fluid base fluid, and using a fracturing truck group to carry out integral pressure test on the casing pipe at the whole well section of the selected casing pipe horizontal well, wherein the pressure is stabilized for 120 minutes under 100MPa, and the pressure drop is qualified when the pressure drop is not more than 0.5 MPa; to obtain a pressure to be appliedAnd (3) splitting the complete horizontal well shaft, wherein the physical diagram is shown in figure 5.
The sealing agent is a product compounded by finely processing and grain composition of various multifunctional materials.
Appearance: grayish brown powder
Particle size distribution: 8-2500 meshes
Density: 3.15-3.20g/cm3
Preparing a fluid: similar to cement paste;
preparing density: 1.45-2.60g/cm3
Apparent viscosity: 25-85 mPa.s;
fluidity: 17-27cm
Thickening time: is arbitrarily adjustable
Drillability: the drillability of the concretion is good
The curing mechanism of the sealant is as follows:
1) form an interpenetrating network structure
The sealing agent and water are prepared into slurry with a certain concentration, when the slurry enters a primary fracturing crack, under the action of pressure difference (greater than 0.7MPa), components in the slurry are synergistic, chemical reaction occurs, at the moment, the slurry can quickly form an interpenetrating network structure to form a special flow state, other components in the slurry can fill gaps in a compact network structure, and the slurry has scouring resistance and has residence performance.
The interpenetrating network structure is mainly formed by winding and coupling various flexible fibers, rigid fibers, CSH gel which is a hydration product in the slurry, crystals produced by a plurality of chemical reactions and the like in the slurry into an integral structure. The slurry does not flow back in the curing section (layer) and the slurry does not generate a slurry mixing zone.
FIG. 6 is a schematic diagram of the structure of the interpenetrating network formed by the slurry.
2) Expansion effect
Calcium sulfoaluminate hydrate reacts with gypsum to produce ettringite, and the crystal lattice of the product occupies larger space than that of the original compound, so that obvious expansion effect is produced, and the volume can be increased.
The swelling effect of calcium oxide and magnesium oxide is: calcium hydroxide and magnesium hydroxide are generated from calcium oxide and magnesium oxide, the crystal form is changed, the volume is increased, and micro-expansion is generated.
The open expansion rate of the sealing agent is 1.8-4.5%.
The expansion rate of the API cured body is 0.3-0.8%.
3) Self-healing action
Under dynamic curing conditions, the surface of the sealant crystallizes into perfect rod-like ettringite crystals, and under the ettringite crystals, part of amorphous hydration products are seen to be corroded (fig. 7), so that a fresh surface is exposed, and on the fresh surface, a large amount of fibrous CSH gel is generated, belonging to CSH (II) type defined by Diamond (fig. 8) and being a product in the early stage of hydration. Fig. 9 is a schematic diagram of the self-healing effect, and these bonding interfaces of the cured bodies of the sealant can continuously generate many erosion-resistant hydration products, eliminate the harmful transition zone of the interfaces, so that the interfaces have strong high-pressure fluid erosion resistance, which is the self-healing effect of the interfaces of the sealant, and this effect fundamentally improves the curing quality, improves the bonding strength of the interfaces, and prolongs the continuity of the interface strength.
4) Staying property
The sealing agent enters a perforation blasthole and a primary fracturing fracture, can quickly form an interpenetrating network structure through a special mechanism, and is effectively retained in a curing layer without returning. When the sealing slurry is applied on site, the thickening time of the sealing slurry can be adjusted according to the specific situation on site so as to meet the requirement of site safety construction.
5) Triaxial stress performance
The results of the three-axis stress test of the basic set cement and the sealant cured body at the circulating temperature of 140 ℃ are shown in Table 8.
TABLE 8 results of triaxial stress analysis
The sealing slurry has higher Poisson's ratio and lower elastic modulus value, namely, the slurry solidified body has good three-dimensional stress resistance, namely, the requirement of the modern well cementation technology can be met. The medium petroleum well cementation cement slurry standard requires that the elastic modulus is less than 5500, and the cement slurry system is qualified.
The results of the temperature resistance test are shown in fig. 10, fig. 11 is the results of the swelling property, fig. 12 is the results of the salt resistance test, and table 9 is the results of the rheological property test.
TABLE 9 rheology test results
The strength of the sealant under XX field conditions is shown in fig. 13, from which it can be derived: the hydration reaction in the sealant was continued for 120 days at 95 ℃; at 150 ℃, the hydration reaction in the sealant is continued for 60 days, and the strength of the sealant cured body cured at 150 ℃ is higher than that cured at 95 ℃. While the ordinary cement paste reaches a stable state within about 100 hours.
FIG. 14 is a physical diagram of a plug slurry uniformly applied to the fractures created by each perforation cluster, the cementing with the cementing agent of the present invention has the following advantages:
1) the sealing agent has a particle size distribution
The sealing agent has various chemical particle compositions of 8-2500 meshes, so that the sealing agent can be cured and used in stratums with different physical properties; the set cement only has one silicate granularity and no particle grading; the sealing agent used in the invention has wider application range.
2) The sealant has residence property
The slurry prepared by the sealing agent contains various chemical components of different particles, can realize synergistic interaction, is in a flat plate type flow pattern in formation pores, has good residence property, can reside in the formation pores, and is not easy to be eroded by formation fluid; the cement slurry is in a peak-type flow pattern (fingering phenomenon) in the formation pores, has no residence property and is easy to be eroded by formation fluid; the blocking agent does not return after entering the stratum, and cement slurry has a return-flow phenomenon.
3) The sealant can form an interpenetrating network structure
The sealing slurry can quickly form an interpenetrating network structure (within 68 s) in a stratum as long as 0.7MPa of acting force exists, and at the moment, a certain pressure bearing capacity (6-8MPa) is achieved, so that the curing effect of the sealing agent is improved; the cement paste can form an interpenetrating network structure only when thickened (generally after 240 min), and is easily diluted and eroded by formation fluid before the structure is formed, so that the curing effect is poor; the success of curing the sealant is much higher than that of cement slurry.
4) The solidified body of the sealing slurry has micro-expansion performance
The mutual action of chemical components in the sealing agent, particularly inorganic particle components, can form a crystal lattice with larger volume, so that the sealing slurry solidified body has a good micro-expansion function, and can form a very compact solidified body with a stratum or a steel medium to bear the action of higher pressure; the solidified body of the cement paste is micro-contracted, micro cracks are formed between surrounding media, the solidified body is easily damaged by stratum pressure, micro leakage occurs, and even if expansive components are added into the cement paste, the integral strength of the cement paste solidified body can be reduced; the effective period of the curing agent is longer after curing.
5) The curing strength of the sealant is high
The strength of a solidified body of the sealing agent is very high, and the sealing agent can bear the pressure difference of 80MPa in the field application at present; the API compressive strength of the cement paste solidified body is qualified as long as the API compressive strength is more than 14MPa, and the solidifying strength is relatively less than that of the sealing agent; the curing agent can meet the requirement of large-scale fracturing of the casing after curing.
6) The sealing agent has high triaxial stress resistance
After the curing of the sealing agent, the triaxial stress experiment shows very good performance, the Poisson ratio (0.203) of the sealing agent is far higher than that of well cementation cement (0.105), and the elastic modulus (4993.4) is far smaller than that of the well cementation cement (6180.2); the setting agent completely reaches or exceeds the index that the elastic modulus of high-quality cement slurry in the medium petroleum well cementation cement standard is less than 5500; the sealant can be fully used for the needs of well cementation.
7) The construction safety of the sealing agent is high
The mutual action of the temperature-resistant and salt-resistant components in the sealing agent is very mild when the sealing agent is used on site, the thickening time is controlled at will, the sealing agent has good compatibility with formation water with the mineralization degree in the formation, has good salt-resistant and temperature-resistant capabilities, does not have the phenomena of 'flash coagulation' and 'coagulation', and has no downhole accident in more than 50 constructed horizontal wells; when the cement paste is used on site, the cement paste is easily polluted by formation water with formation mineralization degree, and the phenomena of 'flash coagulation' and 'coagulation' are easily caused, so that complex underground accidents of 'flag inserting rod' and 'sausage filling' are caused; the construction safety of the sealing agent is high.
Carrying out multistage fracturing operation on the horizontal well to be fractured, wherein a physical diagram is shown in fig. 15;
and pumping a degrading agent, wherein a physical diagram is shown in fig. 16, so that the solidified plugging slurry in the horizontal well to be fractured is completely hydrated, the joint production of new and old fractured fractures is realized, and a physical diagram is shown in fig. 17.
The casing horizontal well shaft rebuilding repeated fracturing method provided by the invention can realize fixed-point reconstruction and has the advantage of high construction efficiency. In addition, the sealing agent has particle grading and can be cured and used in stratums with different physical properties; the sealing agent has residence property, the slurry prepared by the sealing agent contains various chemical components of different particles, can realize synergistic interaction, is in a flat-plate flow pattern in formation pores, has good residence property, can reside in the formation pores and is not easy to be eroded by formation fluid; the sealing agent can form an interpenetrating network structure, and the interpenetrating network structure can be quickly formed (within 68 s) as long as the acting force is 0.7 MPa; the solidified body of the sealing slurry has micro-expansion performance, and the interaction of chemical components in the sealing agent, especially some inorganic particle components, can form crystal lattices with larger volume, so the solidified body of the sealing slurry has good micro-expansion function, can form a very compact solidified body with a stratum or a steel medium, and can bear higher pressure; the curing strength of the sealing agent is high, and the sealing agent can bear the differential pressure operation of 90 MPa; the sealing agent has high triaxial stress resistance, a triaxial stress experiment shows very good performance after the sealing agent is cured, the Poisson ratio (0.203) of the sealing agent is far higher than that of well cementation cement (0.105), and the elastic modulus (4993.4) is far smaller than that of the well cementation cement (6180.2); the setting agent completely reaches or exceeds the index that the elastic modulus of high-quality cement slurry in the medium petroleum well cementation cement standard is less than 5500; the construction safety of the sealing agent is high.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A casing horizontal well shaft rebuilding repeated fracturing method is characterized by comprising the following steps:
an oil pipe or a drill pipe column with a drift gauge is put into a casing of the casing horizontal well and is communicated to the bottom of the artificial well;
an oil pipe or a drill pipe column with a scraper is arranged in a casing of the casing horizontal well, the casing is repeatedly passed through a perforation cluster for many times, and water-based fracturing fluid base fluid is adopted to circulate out fragments;
an oil pipe or a drill pipe column with an upper Y341 packer, a lower Y341 packer, a safety joint, a hydraulic anchor, a flow guide centralizer, a dead plug and a pressure guide sand blower is arranged in the casing of the casing horizontal well, and the pressure guide sand blower is arranged between the two Y341 packers;
aligning the position of a pressure-guide sand blower to the position of a perforation cluster, setting a packer, injecting slick water, testing the water absorption condition of the perforation cluster, directly extruding and injecting sealing slurry if the water absorption is good, starting a fracturing pump truck to press open the perforation cluster if the water absorption is poor or no water absorption is generated, and extruding and injecting the sealing slurry; displacing the sealing slurry to a set depth inside the artificial crack;
and after the sealing slurry is solidified, carrying out conventional multi-cluster perforation volume fracturing and high-density perforation seam volume control fracturing multi-stage fracturing operation.
2. The cased-hole horizontal well wellbore re-fracturing method of claim 1, wherein after the curing of the sealing slurry, before performing conventional multi-cluster perforation volume fracturing, high-density perforation fracture volume control fracturing multi-stage fracturing operations, further comprising:
and (2) putting an oil pipe or a drill pipe column with a scraper into the casing of the casing horizontal well, repeatedly passing through the whole shaft from bottom to top for many times, and circulating the water-based fracturing fluid base fluid to obtain fragments.
3. The cased-hole horizontal well wellbore re-fracturing method of claim 1, wherein after the curing of the sealing slurry, before performing conventional multi-cluster perforation volume fracturing, high-density perforation fracture volume control fracturing multi-stage fracturing operations, further comprising:
and (3) putting an oil pipe or a drill pipe column with a drift size gauge into the casing of the casing horizontal well, and leading the oil pipe or the drill pipe column to the bottom of the artificial well.
4. The cased-hole horizontal well wellbore re-fracturing method of claim 1, wherein after the curing of the sealing slurry, before performing conventional multi-cluster perforation volume fracturing, high-density perforation fracture volume control fracturing multi-stage fracturing operations, further comprising:
and using a water-based fracturing fluid base fluid, and carrying out integral pressure test on the casing pipe at the whole well section of the casing horizontal well by adopting a fracturing truck group to determine whether the casing horizontal well is qualified.
5. The cased-hole horizontal well wellbore re-fracturing method of claim 1, wherein after said performing conventional multi-cluster perforation volume fracturing, high-density perforation fracture controlled volume fracturing multi-stage fracturing operations, further comprising:
using a coiled tubing to carry an electric motor and a drill bit, drilling and grinding a drift well to the bottom of the well, and circulating water-based fracturing fluid base fluid out of bridge plug scraps;
and dragging the pump by using a coiled tubing to inject a special degrading agent, so that the solidified slurry in the casing horizontal well is hydrated to realize the joint production of new and old fracturing fractures.
6. The cased-well, horizontal-well wellbore-rebuilding, re-fracturing method of claim 1, wherein the cementing slurry comprises a cementing agent comprising calcium sulfoaluminate hydrate, gypsum, calcium oxide, and magnesium oxide, and water.
7. The casing horizontal well shaft rebuilding repeated fracturing method of claim 6, wherein the particle size distribution of the sealing agent is 8-2500 meshes, and the density is 3.15-3.20g/cm3。
8. The casing horizontal well shaft rebuilding repeated fracturing method of claim 6, wherein the apparent viscosity of the sealing slurry is 25-85mPa s, and the fluidity is 17-27 cm.
9. The cased-hole horizontal well wellbore rebuild frac repeat method of claim 5, wherein the degrading agent comprises potassium permanganate or sodium persulfate.
10. The method of casing horizontal well wellbore re-fracturing of claim 1, further comprising, prior to running a tubing or drill pipe string with a drift gauge within the casing of the casing horizontal well:
performing repeated fracturing potential analysis on the casing horizontal well by using the geological characteristics of the regional structure, the reservoir characteristics, the single well control reserve and the previous extraction degree as analysis parameters; wherein the reservoir characteristics comprise logging characteristics and tectonic sedimentary characteristics, reservoir longitudinal and transverse distributions, three-dimensional stress states, natural fracture development conditions, and dessert interlayer distributions, the dessert interlayer distributions comprising reservoir dessert distribution characteristics and interlayer distribution characteristics; the single well controlled reserves include hydrocarbon-bearing area, hydrocarbon layer thickness, effective porosity, crude oil natural gas density, hydrocarbon saturation, and volume factor.
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