CN114718542A - Horizontal well acidizing method for carbonate reservoir of perforated pipe well completion - Google Patents
Horizontal well acidizing method for carbonate reservoir of perforated pipe well completion Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 55
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 63
- 238000010276 construction Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000009826 distribution Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 230000020477 pH reduction Effects 0.000 abstract description 46
- 238000010521 absorption reaction Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 14
- 241000361919 Metaphire sieboldi Species 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 230000008901 benefit Effects 0.000 description 7
- 230000035515 penetration Effects 0.000 description 7
- 210000003371 toe Anatomy 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 241001233061 earthworms Species 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
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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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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Abstract
The invention provides a horizontal well acidizing method for a carbonate reservoir by using a perforated pipe for well completion. The method comprises the following steps: perforating the perforated pipe at the horizontal section of the target horizontal well at an ultra-small perforation density so as to complete the completion of the perforated pipe of the target horizontal well; the ultra-small perforation density meets the requirement that 1 perforation group is arranged in each 5-15 m perforating pipe, each perforation group consists of 1-2 perforations, and the perforations on the same perforation group are positioned on the same plane vertical to the extending direction of the perforating pipe; using a particle size of not less than 2m3And injecting acid liquor into the target horizontal well at the discharge volume of/min, thereby completing the acidification construction. The method adopts ultra-small pore density and ultra-large discharge capacity, greatly improves the flow rate and discharge capacity of the acid liquor in the acidification process, enables the acid liquor to form jet flow through the perforation holes, forms deeper penetrating earthworm holes, bypasses stratum pollution zones, and effectively removes the near-well groundPollution is brought, the physical property of a reservoir in a far well zone is improved, the oil extraction index of a horizontal production well or the water absorption index of a horizontal water injection well is greatly improved, and the acidification effect is improved.
Description
Technical Field
The invention relates to a horizontal well acidizing method for a carbonate reservoir of a perforated pipe well completion.
Background
The carbonate reservoir long horizontal section horizontal well faces a series of problems in the well completion and production increase process.
The horizontal well adopts a casing cementing perforation completion and matched acidification and acid fracturing production increasing mode, so that the problems of complex construction, high cost and large construction risk exist, a large part of horizontal wells are drilled along the direction of the maximum main stress of the stratum, and a transverse cutting seam cannot be formed during acid fracturing, so that the acid fracturing effect is poor.
When the horizontal well completed by adopting the perforated pipe mode is acidized by adopting the oil pipe general matrix, a large amount of acid liquor is consumed at the heel part of the horizontal well, so that the acidizing effect is poor. For the reason, the acidification and blockage removal of the horizontal well in the conventional carbonate rock oilfield perforated pipe well completion usually adopts a coiled tubing to drag the acidification. Although the coiled tubing is adopted to drag the acidification, the whole well section of the whole horizontal section can be acidified by dragging the coiled tubing, the acidification radius is small due to the low acidification discharge capacity of the coiled tubing, and the deep plugging removal transformation of the reservoir cannot be carried out. In addition, for the ultra-deep horizontal well, the length of the coiled tubing is limited, so that the coiled tubing cannot be lowered into the toe of the horizontal section of the ultra-deep horizontal well for acidification.
In summary, a new carbonate reservoir horizontal well acidizing method still needs to be researched at present, compared with the existing carbonate reservoir horizontal well acidizing method, the well completion time and cost can be saved, the acid penetration depth can be increased, the skin coefficient can be reduced, the oil extraction index/water absorption index of the carbonate reservoir horizontal well can be improved, and the acidizing effect can be improved.
Disclosure of Invention
The invention aims to provide a method for matrix acidizing of a horizontal well of a carbonate reservoir, which is suitable for perforated pipe well completion, and has an excellent acidizing effect without using a continuous oil pipe dragging acidizing mode.
In order to achieve the aim, the invention provides a horizontal well acidizing method for a carbonate reservoir by using a perforated pipe to complete well, which comprises the following steps:
perforating the perforated pipe at the horizontal section of the target horizontal well at an ultra-small perforation density so as to complete the completion of the perforated pipe of the target horizontal well; wherein, the ultra-small perforation density meets the condition that 1 perforation group is arranged in each 5-15 meters of perforated pipes (namely, the distance between adjacent perforation groups along the extending direction of the perforated pipes is 5-15), wherein, each perforation group consists of 1-2 perforations, and the perforations on the same perforation group are positioned on the same plane vertical to the extending direction of the perforated pipes;
using a particle size of not less than 2m3And injecting acid liquor into the target horizontal well at the discharge volume of/min, thereby completing the acidification construction.
According to the technical scheme provided by the invention, by adopting the ultra-small pore density and the ultra-large discharge capacity, the flow and the discharge capacity of the mesoporous acid liquid in the acidification construction process are greatly improved, so that the acid liquid forms a jet effect through perforation holes in the acidification construction process, and thus deeper penetrating wormholes are formed, a deeply penetrating wormhole bypass stratum pollution zone is created, the pollution of a near well zone can be effectively relieved, the physical property of a reservoir layer of a far well zone is improved, the oil extraction index of a horizontal production well or the water absorption index of a horizontal water injection well is greatly improved, and the acidification effect is improved.
In the acidizing method, the perforations on the perforated pipes of the horizontal section of the target horizontal well form a hole density distribution with a small heel and a large toe;
more preferably, the number of perforation groups of the front 1/4 section (including the initial position and the position 1/4) of the perforated pipe of the horizontal segment of the target horizontal well accounts for 10% -15% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, the number of perforation groups of the 1/4-1/2 sections (not including the 1/4 position and including the 1/2 position) of the perforated pipe of the horizontal segment of the target horizontal well accounts for 20% -25% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, the number of perforation groups of the 1/2-3/4 sections (not including the 1/2 position and including the 3/4 position) of the horizontal segment of the target horizontal well accounts for 25% -30% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, and the number of perforation groups of the rear 1/4 section (not including the 3/4 position and including the final position) of the horizontal segment of the perforated pipe of the target horizontal segment accounts for the total number of the perforated pipe of the whole horizontal segment 35-40% of the number of perforation groups.
In the preferred embodiment, differential perforation is adopted, and the pore density distribution on the perforated pipe is adjusted according to the distance between the perforation position and the heel part of the horizontal well, so that the pore density distribution with less heel part and more toe part is formed, the toe part of the perforated pipe in the horizontal section can be conveniently transported to remove blockage, and the acid is prevented from being intensively consumed at the heel part of the perforated pipe in the horizontal section; in one embodiment, the hole density gradually decreases in a certain proportion from the heel to the toe of the perforated pipe of the horizontal section of the target horizontal well.
In the acidification method, the diameter of the perforation hole on the perforated pipe is preferably 11.17mm-25.4 mm; more preferably, the perforations in the perforated tube are 11.17mm in diameter.
In the acidification method, the perforation phase on the perforated pipe is preferably 50-180 degrees; more preferably, the perforations on the perforated pipe are 180 ° out of phase.
In the above acidification method, preferably, not less than 3m is used3Injecting acid liquor into the target horizontal well at the displacement of/min;
in the above acidification method, preferably, 2 to 10m is used3Injecting acid liquor into the target horizontal well at a displacement of/min; more preferably, 3m is used3/min-9m3And injecting acid liquor into the target horizontal well at the discharge capacity of/min.
In the above acidizing method, preferably, the wellbore pressure is controlled to be lower than the reservoir fracture pressure during the injection of the acid solution.
In the acidification method, preferably, the acid liquor is injected by using an acidification pump truck set, and the water horsepower of the pump truck set is 500 hp-7000 hp.
In the acidizing method, preferably, during the acid liquid injection process, the acid liquid injection is carried out by adopting the maximum discharge capacity on the premise that the pressure of a well bore is lower than the fracture pressure of a reservoir and the water horsepower of a pump truck group is allowed and the stratum liquid absorption capacity is allowed.
In the above acidification method, preferably, the displacement liquid is further injected after the injection of the acid liquid.
In the prior art, the perforation density of horizontal well completion is usually more than 16 holes/meter, and the increase of the perforation density under the condition of not exceeding the limit of the hole density is generally considered in the prior art to be beneficial to the improvement of acidizing effect, and the discharge capacity during acid liquor injection is usually 0.2m3/min-1m3The/min horizontal well acidizing method for the carbonate reservoir of the conventional perforated pipe completion is shown in figure 2. The technical scheme provided by the invention is different, and the technical scheme provided by the invention adopts the perforation density far less than the conventional acidification and the acid liquor discharge far more than the conventional acidification to carry out the horizontal well acidification of the carbonate reservoir in perforated pipe completion. According to the technical scheme provided by the invention, the large-displacement acid liquor is matched with the low-density perforation in the acidification process, so that the acid inlet amount and the displacement of a single perforation hole are far higher than those of a single perforation hole in the conventional perforated pipe well completion acidification mode, a jet flow can be formed when the acid liquor passes through the perforation hole without using a jet flow tool, the acid liquor penetration depth is greatly improved due to the formation of the jet flow, the skin of a near well zone is reduced, the permeability of the far well zone is improved, and the post-acid water absorption index/oil extraction index of a horizontal well is greatly improved.
In addition, the technical scheme provided by the invention has the advantages that the construction process is simple and easy to realize, the acid liquid pumping construction pump truck quantity is properly increased and the perforation density is adjusted under the condition of not adopting a special layered acidification tool, the matrix acidification of the carbonate reservoir horizontal well completed by the perforated pipe can have an excellent acidification effect without using a continuous oil pipe to drag an acidification mode, and the construction cost and the construction risk are lower.
Drawings
Fig. 1 is a schematic diagram of a horizontal well acidizing method for a carbonate reservoir with a perforated-pipe completion provided in example 1.
Fig. 2 is a schematic diagram of a horizontal well acidizing method for a carbonate reservoir in conventional perforated pipe completion.
FIG. 3 is a graph comparing the wormhole penetration depth of the wormholes of example 1 and comparative example 1.
FIG. 4 is a graph of water absorption index of a horizontal well after acidizing in example 1.
FIG. 5 is a graph of water absorption index of horizontal wells after acidizing of comparative example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in detail and completely with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all 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.
The invention provides a brand new carbonate reservoir horizontal well acidizing method for perforated pipe completion, aiming at solving the problems in the matrix acidizing construction of the carbonate reservoir horizontal well of the existing perforated pipe completion. In one embodiment of the invention, the horizontal well acidizing method for the carbonate reservoir by using the perforated pipe completion comprises the following steps:
step S1: punching holes on the horizontal section of the perforated pipe of the target horizontal well at an ultra-small perforation density so as to complete the completion of the perforated pipe of the target horizontal well; the ultra-small perforation density meets the requirement that 1 perforation group is arranged in each 5-15 m of perforated pipe (namely the distance between adjacent perforation groups along the extending direction of the perforated pipe is 5-15), wherein each perforation group consists of 1-2 perforations, and the perforations on the same perforation group are positioned on the same plane vertical to the extending direction of the perforated pipe;
step S2: using a particle size of not less than 2m3Injecting acid liquor into the target horizontal well at the discharge volume of/min, and further completing acidizing construction.
Further, the perforations on the perforated pipes of the horizontal section of the target horizontal well form a dense distribution of holes with few heels and many toes;
furthermore, by taking the heel of the perforated pipe of the horizontal segment of the target horizontal well as a starting point, the number of perforation groups of the front 1/4 segment (including the starting position and including the 1/4 position) of the perforated pipe of the horizontal segment of the target horizontal well accounts for 10% -15% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, the number of perforation groups of the 1/4-1/2 segments (not including the 1/4 position and including the 1/2 position) of the perforated pipe of the horizontal segment of the target horizontal well accounts for 20% -25% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, the number of perforation groups of the 1/2-3/4 segments (not including the 1/2 position and including the 3/4 position) of the horizontal segment of the target horizontal well accounts for 25% -30% of the total number of perforation groups of the perforated pipe of the whole horizontal segment, and the number of perforation groups of the rear 1/4 segment (not including the 3/4 position and including the key position) of the horizontal segment of the target horizontal segment accounts for 25% -30% of the perforated pipe of the whole horizontal segment 35-40% of the total number of perforation groups.
Further, the perforation phase on the perforated pipe is 50-180 degrees, such as 180 degrees.
Further, the perforations in the perforated tube may have a diameter of 11.17mm to 25.4mm, for example 11.17 mm.
Further, the acid liquor injection displacement in the acid liquor injection process is optimized; in one embodiment, not less than 3m is used3Injecting acid liquor into the target horizontal well at the displacement of/min; in one embodiment, 2-10m is used3Injecting acid liquor into the target horizontal well at the displacement of/min; in one embodiment, 3m is used3/min-9m3And injecting acid liquor into the target horizontal well at the discharge capacity of/min.
Further, in the process of injecting acid liquor, controlling the pressure of a shaft to be lower than the reservoir fracture pressure; for example, the wellbore pressure can be controlled to be lower than the reservoir fracture pressure by controlling the acid injection displacement, and under the condition that the wellbore pressure is lower than the reservoir fracture pressure, the acid injection displacement is selected as large as possible.
And further, an acidification pump truck set is adopted for injecting the acid liquor, and the water horsepower of the pump truck set is 500-7000 hhp.
Further, in the acid liquor injection process, the acid liquor injection is carried out by adopting the maximum displacement on the premise that the well bore pressure is lower than the reservoir fracture pressure and the water horsepower of the pump truck group and the stratum imbibition capacity are allowed.
Further, the displacing liquid is further injected after the acid liquid is injected.
The technical scheme provided by the invention has the advantages that the acid liquor discharge capacity is far higher than the discharge capacity of the acidification of the horizontal well of the conventional perforated pipe, and the perforation density is far lower than the perforation density of the acidification of the horizontal well of the conventional perforated pipe. According to the principle of conservation of volume
The technical scheme provided by the invention greatly improves the acid liquor discharge capacity, greatly reduces the number of perforation holes, and ensures that the acid inlet quantity V of each perforation hole is greatly increasednIs greatly increased. According to the formula of acidification radial flow Gadanski
The length of the earthworm hole is in direct proportion to the acid amount, so that the length of the earthworm hole is greatly prolonged compared with the earthworm hole generated during acidification in the prior ordinary perforation mode. At the same time, according to the law of conservation of displacement
According to the technical scheme provided by the invention, the acid liquor discharge capacity is greatly increased, and the number of perforation holes is greatly reduced, so that the discharge capacity of each perforation hole is greatly increased to form a jet flow, the acid liquor filtration loss of a single earthworm hole is effectively compensated, and the growth of the earthworm hole is ensured. After the earthworm hole penetrates through a polluted area, the seepage mode of a near wellbore area is changed, the radial flow from the stratum to the horizontal shaft is changed into the linear flow from the stratum to the earthworm hole and the linear flow in the earthworm hole, and the fluid seepage resistance is greatly reduced, so that the oil recovery index and the water absorption index of a water injection well after the oil well is acidified are improved. Particularly for a carbonate reservoir horizontal well drilled along the maximum horizontal principal stress, the problems that transverse cutting cannot be generated by acid fracturing, the production cannot be effectively improved, the acidification discharge capacity of a continuous oil pipe is low, and acid cannot penetrate deeply into the reservoir to effectively remove blockage are solved, and a new and effective technical measure is provided for the efficient development of a carbonate reservoir oil-gas field.
Example 1
The embodiment provides a horizontal well acidizing method for a carbonate reservoir with a perforated pipe completion, which comprises the following steps:
1) completing the horizontal section of the target horizontal well by adopting a perforated pipe, wherein the horizontal section of the target horizontal well is 1007.5 meters long; wherein the diameters of perforation holes on the perforating pipes are 11.17mm, the perforating phase is 180 degrees, the total number of the perforation groups is 140, each perforation group consists of 2 perforations, the perforations on the same perforation group are positioned on the same plane vertical to the extending direction of the perforating pipes, the section of 0-250 meters (including 0 meter and 250 meters) of the heel part of the horizontal well is perforated for 20 times to form 20 perforation groups, and the perforation is performed for 1 time every 12.5 meters (namely the distance between the adjacent perforation groups is 12.5 m); punching 25 times by using 250-500 meters (without 250 meters and with 500 meters) to form 25 perforation groups, and punching once every 10 meters (namely, the distance between the adjacent perforation groups is 10 m); punching for 45 times by 500-750 meters (not containing 500 meters and containing 750 meters) to form 45 perforation groups, and punching for every 5.6 meters (namely, the distance between the adjacent perforation groups is 5.6 m); finally, 50 perforation sets are formed for 750-1007.5 meters (without 750 meters and with 1007.5 meters), and every 5.15 meters is perforated (namely, the distance between adjacent perforation sets is 15.15 m).
2) The parallel connection of 3 1000 hp acidification pump trucks and a 76.2mm pipeline are adopted for acidification construction, and the length of the pipeline is 4.5m3Permin displacement for injecting acid liquor into target horizontal well by 280m3Then at 4.5m3Permin displacement is used for injecting displacement fluid 17m into a target horizontal well3(ii) a The construction pressure is 15-27Mpa in the acidification construction process.
A schematic diagram of the horizontal well acidizing method for the carbonate reservoir with perforated pipe completion in this example is shown in fig. 1.
Comparative example 1
The comparative example provides a horizontal well acidizing method for a carbonate reservoir with conventional perforated pipe completion, which comprises the following steps:
1) the horizontal section of the target horizontal well (which is the adjacent well of the target horizontal well in example 1) is 1059.3 m long and is completed by adopting a conventional perforated pipe; wherein the diameters of the perforations on the perforating pipes are 11.17mm, the perforating phase is 50-60 degrees, 42360 perforations (the perforation density is about 40 perforations/m) are totally arranged, and the spacing distances between the adjacent perforations in the extending direction of the perforating pipes are the same.
2) 1 1000 hp acidification pump truck and 50.8mm coiled tubing are adopted for acidification construction, and the thickness of the oil is 0.8m3Permin displacement is used for injecting acid liquid 285m into target horizontal well3Then at 0.8m3Permin displacement target horizontal wellInjecting a displacing liquid of 17m3(ii) a The construction pressure in the acidification construction process is not more than 36.3 Mpa.
Experimental example 1
The economic benefit, the wormhole penetration depth of acid etching earthworms and the water absorption index after the acidification construction of the acidification methods of the embodiment 1 and the comparative embodiment 1 are compared.
Economic benefits are as follows: example 1 compared to the acidification method of comparative example 1, the cost of 2 additional 1,000hhp acidification pumps is required, but the expense of the more costly coiled tubing equipment is reduced.
Acid etching earthworm hole penetration depth: according to the volume conservation law and the Gdanski radial flow wormhole formula, calculating the wormhole penetration depth of acid etching in the acid liquid injection process in the construction process of the comparative example 1 and the embodiment 1; the results are shown in FIG. 3. As can be seen from fig. 3, the wormhole penetration depth of the method provided in example 1 is significantly increased compared to the method provided in example 2.
Water absorption index: the water absorption indexes of the horizontal wells after acidizing construction of the example 1 and the comparative example 1 are respectively tested, and the results are shown in fig. 4 and fig. 5. Referring to fig. 4 and 5, the average initial water absorption index of the horizontal well after acidizing construction in example 1 is 205m3The water absorption index per day is much higher than that of the initial water absorption index of the horizontal well after acidizing construction of comparative example 1, namely 158.8m3And d/MPa, and the steady injection effect of the horizontal well after acidizing construction in the embodiment 1 is obviously better than that of the horizontal well after acidizing construction in the comparative example 1.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
Claims (10)
1. A horizontal well acidizing method for a carbonate reservoir with a perforated pipe completion comprises the following steps:
perforating the perforated pipe at the horizontal section of the target horizontal well at an ultra-small perforation density so as to complete the completion of the perforated pipe of the target horizontal well; the ultra-small perforation density meets the requirement that 1 perforation group is arranged in each 5-15 m perforated pipe, wherein each perforation group consists of 1-2 perforations, and the perforations on the same perforation group are positioned on the same plane vertical to the extending direction of the perforated pipe;
using a particle size of not less than 2m3Injecting acid liquor into the target horizontal well at the discharge volume of/min, and further completing acidizing construction.
2. The method of claim 1 wherein the perforations in the perforated pipes of the horizontal section of the target horizontal well form a dense distribution of fewer heel and more toe perforations.
3. The method according to claim 2, wherein the starting point of the root of the perforated pipe in the horizontal section of the target horizontal well is counted, the number of perforation groups in the front 1/4 section of the perforated pipe in the horizontal section of the target horizontal well accounts for 10% -15% of the total number of perforation groups of the perforated pipe in the whole horizontal section, the number of perforation groups in the 1/4-1/2 section of the perforated pipe in the horizontal section of the target horizontal well accounts for 20% -25% of the total number of perforation groups of the perforated pipe in the whole horizontal section, the number of perforation groups in the 1/2-3/4 section of the horizontal section of the target horizontal well accounts for 25% -30% of the total number of perforation groups of the perforated pipe in the whole horizontal section, and the number of perforation groups in the rear 1/4 section of the perforated pipe in the horizontal section of the target horizontal well accounts for 35% -40% of the total number of perforation groups of the perforated pipe in the whole horizontal section;
wherein the front 1/4 paragraph contains a start position and contains 1/4 position; the 1/4-1/2 paragraphs are devoid of position 1/4 and contain position 1/2; the 1/2-3/4 paragraphs are free at position 1/2 and contain at position 3/4; the rear 1/4 segment contains no 3/4 positions and contains a terminal position.
4. The method of claim 1, wherein,
the diameter of a perforation hole on the perforating pipe is 11.17mm-25.4 mm; preferably, the diameter of the perforation on the perforating pipe is 11.17 mm;
the perforation phase on the perforating pipe is 50-180 degrees; preferably, the perforation phase on the perforated pipe is 180 degrees.
5. The method of claim 1, wherein not less than 3m is used3And injecting acid liquor into the target horizontal well at the discharge capacity of/min.
6. The method of claim 1, wherein 2-10m is used3And injecting acid liquor into the target horizontal well at the discharge capacity of/min.
7. The method of claim 6, wherein 3m is used3/min-9m3And injecting acid liquor into the target horizontal well at the discharge capacity of/min.
8. The method of claim 1, wherein during the injecting the acid fluid, the wellbore pressure is controlled to be below a reservoir fracture pressure.
9. The method of claim 1, wherein the acid injection is performed using an acid pump truck set having a water horsepower of 500 hp to 7000 hp.
10. The method of claim 1, wherein the injection of the acid solution is followed by a further injection of a displacement fluid.
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| CN113738335A (en) * | 2021-09-03 | 2021-12-03 | 东方宝麟科技发展(北京)有限公司 | Seam control integrated volume fracturing method suitable for massive pure shale oil reservoir |
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| CN107605451A (en) * | 2017-09-15 | 2018-01-19 | 中国地质大学（武汉） | A kind of ladder discharge capacity fracturing pump injecting method based on combined perforation |
| CN109958416A (en) * | 2017-12-22 | 2019-07-02 | 中国石油化工股份有限公司 | A kind of more cluster perforation press cracking methods of the close uniform feed liquor of variable orifice diameter variable orifice into sand |
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