CN116263094A - Carbonate rock drainage temporary plugging steering deep acid fracturing method - Google Patents
Carbonate rock drainage temporary plugging steering deep acid fracturing method Download PDFInfo
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- 239000002253 acid Substances 0.000 title claims abstract description 281
- 238000000034 method Methods 0.000 title claims abstract description 53
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 37
- 239000011435 rock Substances 0.000 title claims abstract description 13
- 238000010276 construction Methods 0.000 claims abstract description 152
- 230000008719 thickening Effects 0.000 claims abstract description 56
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 239000012530 fluid Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 27
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- 239000004576 sand Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 230000001965 increasing effect Effects 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 22
- 230000007797 corrosion Effects 0.000 claims abstract description 13
- 238000005260 corrosion Methods 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 19
- 239000003381 stabilizer Substances 0.000 claims description 13
- -1 iron ion Chemical class 0.000 claims description 11
- 239000003112 inhibitor Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 8
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- 239000002562 thickening agent Substances 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
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- 238000005530 etching Methods 0.000 abstract description 12
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- BFSPAPKTIGPYOV-BQYQJAHWSA-N (e)-1-[4-(4-hydroxyphenyl)piperazin-1-yl]-3-thiophen-2-ylprop-2-en-1-one Chemical group C1=CC(O)=CC=C1N1CCN(C(=O)\C=C\C=2SC=CC=2)CC1 BFSPAPKTIGPYOV-BQYQJAHWSA-N 0.000 description 6
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 101000766118 Haloarcula sp. (strain arg-2 / Andes heights) Cruxrhodopsin-2 Proteins 0.000 description 1
- 229920001938 Vegetable gum Polymers 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
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- IMBXRZKCLVBLBH-OGYJWPHRSA-N cvp protocol Chemical group ClCCN(CCCl)P1(=O)NCCCO1.O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1.C([C@H](C[C@]1(C(=O)OC)C=2C(=C3C([C@]45[C@H]([C@@]([C@H](OC(C)=O)[C@]6(CC)C=CCN([C@H]56)CC4)(O)C(=O)OC)N3C=O)=CC=2)OC)C[C@@](C2)(O)CC)N2CCC2=C1NC1=CC=CC=C21 IMBXRZKCLVBLBH-OGYJWPHRSA-N 0.000 description 1
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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
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a carbonate rock drainage temporary plugging steering deep acid fracturing method, which comprises the following steps: s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction; s2, after the sand-adding fracturing construction is finished, carrying out acid fracturing construction by adopting an alternate acid injection procedure; s3, after the acid fracturing construction is finished, injecting slickwater fracturing fluid to perform displacement operation, and then injecting an acid-resistant temporary plugging agent to temporarily plug acid-etched cracks; s4, repeating the operations of the step S2 and the step S3 for 0 to 3 times in sequence until the construction pressure is increased by 5 to 8MPa after temporary plugging; s5, carrying out acid fracturing construction again by adopting an alternate acid injection procedure; s6, injecting slickwater fracturing fluid to perform displacement operation, and ending acid fracturing construction. According to the invention, the slickwater is adopted to carry sand for fracturing and plugging natural cracks, so that the acid liquid filtration loss is reduced, and the acid liquid acting distance and the acid corrosion crack diversion capability are improved. The thickening acid and the diverting acid are alternately injected in multiple stages, so that the reaction rate of the acid liquor is reduced, and the length of acid etching cracks and the volume of acid fracturing transformation are improved.
Description
Technical Field
The invention belongs to the technical field of fracturing, and particularly relates to a carbonate rock drainage temporary plugging steering deep acid fracturing method.
Background
Carbonate reservoirs typically develop natural fractures and karsts with severe heterogeneity, the fracture-cave system being the primary site for oil and gas reservoirs and seepage; the oil gas seepage channel is mainly a crack due to the characteristics of low hole-throat coordination degree, poor connectivity, low matrix permeability and the like of the reservoir. Theory and practice prove that the acid fracturing is a main technological measure for increasing the yield of the carbonate hydrocarbon reservoir. Through acidizing fracturing transformation, acid liquor is eroded in an uneven mode, and acid eroded cracks with certain length and diversion capacity can be still maintained when the cracks are closed, so that the oil gas seepage channels and the oil storage space are communicated and connected, the purpose of increasing yield is achieved, and normal production and high-yield stable production of an oil well are ensured.
Carbonate reservoirs are generally buried deeper and have higher temperatures and closure pressures, and therefore, acid fracturing reforms of carbonate reservoirs face a number of difficulties: the reservoir cracks are developed relatively, and acid liquor filtration is large; (2) The reservoir is buried deeply, the temperature can reach 120-140 ℃, the reaction speed of acid rock is high, the extension of the acid etching distance of cracks is influenced, deep penetration is difficult to effectively realize, and difficulties are brought to effectively communicating with an advantageous reservoir body or karst cave at the far part of a shaft; (3) Because the acid liquor is larger in filtration loss, the acid etching effect is insufficient, and the acid etching crack has lower flow conductivity.
The invention patent of application number 201510388885.1 discloses a method for acid fracturing a carbonate reservoir, comprising the following steps in sequence: step a: adopting slick water to pretreat the reservoir; step b: sequentially injecting low-viscosity acid liquor and slick water; step c: sequentially injecting a medium/high viscosity acid solution, a low viscosity acid solution and slick water; step d: and in the displacement stage, injecting displacement liquid. The technology relies on the combination of the alternating change of the viscosity of the acid liquor and the slickwater to improve the acid etching distance and the complexity of cracks, and the temporary plugging steering material is not used, so that the modification degree is limited to a certain extent.
The invention patent of application number 201910385857.2 discloses a carbonate reservoir stitch-bonding net volume acid fracturing method which is carried out according to the following method: injecting low-viscosity emulsion slickwater acid liquid into a carbonate oil-gas field well to reduce the migration resistance of the low-viscosity emulsion slickwater acid liquid in a near-wellbore zone; injecting low-viscosity emulsion slick water acid liquid into a carbonate oil-gas field well, and performing fracture network volume acid fracturing modification on the dominant fracture channels near the jet hole section; pumping vegetable gum liquid into a carbonate oil-gas field well to finish the steering process of the low-viscosity emulsion slickwater acid liquid; pumping low-viscosity emulsion slick aqueous acid liquor into the carbonate oil-gas field well continuously to finish the process of modifying the acid pressure of the stitch-bonded net volume; and injecting displacement fluid into the carbonate oil-gas field well, and testing the oil-gas yield. The technology realizes the joint making and acid fracturing transformation of the carbonate reservoir by means of alternate injection of the low-viscosity emulsion slickwater acid liquid and the plant glue liquid, improves the acid etching distance and the complexity of the joint, does not use temporary plugging steering materials, and has certain limitation on transformation degree.
Disclosure of Invention
The invention aims to overcome the defects of large acid liquor filtration loss, short acid etching crack distance and low crack flow conductivity of the conventional acid fracturing technology and provides a carbonate rock drainage temporary plugging steering depth acid fracturing method.
The technical scheme adopted by the invention is as follows:
a carbonate filter-reducing temporary plugging steering deep acid fracturing method comprises the following steps:
s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction;
s2, after sand fracturing construction is finished, carrying out acid fracturing construction by adopting an alternate acid injection procedure;
s3, injecting slickwater fracturing fluid to replace after the acid fracturing construction is finished, then injecting acid-resistant temporary plugging agent to temporarily plug acid-etched cracks, and entering a step S4 if the construction pressure after temporary plugging is increased to be lower than 5 MPa; if the construction pressure is increased by 5-8 MPa after temporary plugging, directly entering step S5;
s4, repeatedly executing the operations of the step S2 and the step S3 for a plurality of times, specifically, the steps may be: (first-stage acid fracturing construction+first-stage slickwater fracturing fluid displacing operation, first temporary plugging construction) + (second-stage acid fracturing construction+second-stage slickwater fracturing fluid displacing operation, second temporary plugging construction) + … … (Nth-stage acid fracturing construction+Nth-stage slickwater fracturing fluid displacing operation, nth temporary plugging construction), wherein N is 2 and 3 … …, and the construction pressure is increased by 5-8 MPa after temporary plugging;
s5, carrying out acid fracturing construction again by adopting an alternate acid injection procedure;
s6, injecting slickwater fracturing fluid to perform displacement operation, and ending acid fracturing construction.
Further, the liquid amount for sand fracturing construction is 200-300 square, the construction displacement is 3-4 square/min, and the average sand ratio is 10% -15%; the liquid amount for acid pressure construction is 150-300 square, and the construction displacement is 3-6 square/min.
Further, in the step S1, the dosage of the slickwater is 150-300 square, the dosage of the powder ceramic propping agent is 5-20 square, and the dosage of the fiber is 100-150 kg.
In the step S1, a powder ceramic propping agent and fiber seam making and filtration reducing agent are adopted, preferably, the powder ceramic propping agent is a ceramic propping agent with the particle size of 70-140 meshes, and the pressure bearing grade of the powder ceramic propping agent is higher than the formation closing pressure of a reforming well section (the formation closing pressure can be obtained through a fracturing test).
Preferably, the fibers are water-soluble polyvinyl alcohol fibers with an average molecular weight of 60000-150000.
Further, the alternating acid injection process refers to acid pressure construction by adopting an alternating acid injection mode of thickening acid and steering acid, and specifically comprises the following steps: each acid pressing construction is performed by alternately injecting construction according to the sequence of 30-60 parts of thickening acid, 30-60 parts of steering acid, 30-60 parts of thickening acid, 30-60 parts of steering acid and 30-60 parts of thickening acid, and the construction discharge capacity is 3-6 parts/min.
Further, the viscosity of the thickening acid is 20-50 mPa.s, and the viscosity of the steering acid is 10-20 mPa.s.
Further, in the step S3, the dosage of the slickwater fracturing fluid is 10-40 square, and the viscosity is 10-40 mPa.s. And S6, the consumption of the slickwater fracturing fluid in the step is the volume of the tubular column from the wellhead to the reconstruction well section, and the viscosity is 10-40 mPa.s.
Preferably, the thickening acid comprises the following components in percentage by weight: 18 to 20 percent of hydrochloric acid, 0.2 to 1.0 percent of thickening agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer, 0.5 to 1.5 percent of cleanup additive and the balance of water.
Preferably, the diverting acid is composed of the following substances in percentage by weight: 18 to 20 percent of hydrochloric acid, 1.0 to 1.5 percent of acid liquid surfactant, 0.1 to 0.5 percent of acid-resistant resistance-reducing agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer and the balance of water.
Preferably, the carbonate rock drainage temporary plugging steering depth acid fracturing method comprises the following steps of:
s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction;
s2, after sand fracturing construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out first-stage acid fracturing construction;
s3, injecting slickwater fracturing fluid to replace after the first-stage acid fracturing construction is finished, and then injecting an acid-resistant temporary plugging agent to temporarily plug acid-etched cracks, wherein the addition amount of the temporary plugging agent is designed according to the plugging performance of the acid-resistant temporary plugging agent, and if the construction pressure after the first temporary plugging is increased to be lower than 5MPa, the second temporary plugging or the third temporary plugging can be carried out until the construction pressure after the temporary plugging is increased to be 5-8 MPa;
s4, after temporary plugging construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out second-stage acid fracturing construction;
s5, after the second-stage acid fracturing construction is finished, injecting slickwater fracturing fluid again to replace, and injecting an acid-resistant temporary plugging agent to temporarily plug the second acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s6, after the second temporary plugging construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out third-stage acid fracturing construction;
s7, injecting slickwater fracturing fluid to replace after the third-stage acid fracturing construction is finished, and finishing the acid fracturing construction.
The beneficial effects of the invention are as follows:
1. the invention can be widely used for acid fracturing modification of various carbonate reservoirs, realizes effective plugging of modified cracks through acid-resistant temporary plugging agents, forms steering cracks, improves the modification volume and modification effect of the reservoir, and has the characteristics of low construction cost, simple site construction, reliable plugging, obvious post-compression effect and high controllability compared with the existing carbonate volume fracturing technology.
2. The slickwater is adopted to carry sand for fracturing and plugging natural cracks, so that acid liquid filtration loss is reduced, acid liquid and carbonate rock are fully reacted, the acid liquid acting distance and acid corrosion crack flow conductivity are improved, and the reservoir transformation effect is improved.
3. The thickening acid and the diverting acid are alternately injected in multiple stages, so that the reaction rate of the acid liquor is reduced, and the length of acid etching cracks and the volume of acid fracturing transformation are improved.
4. The method and the process related by the invention have simple thought, are convenient to operate and implement on site, do not need to add additional matched devices compared with the conventional acid fracturing measures and processes at present, have lower cost or approximate cost of the whole construction process to the current main stream process, and have obvious effect of reducing cost and enhancing efficiency.
5. The more branch slits and micro-slit systems are formed in a multi-stage alternate injection mode, the more obvious the stress release effect along the main slit direction is, the rapid reducing effect of ground stress on the diversion capacity caused by acting on a single main slit is effectively avoided, and the diversion capacity of the slit can be maintained for a longer time.
The present invention will be described in further detail with reference to the following embodiments, so that the above objects, features and advantages of the present invention can be more clearly understood.
Detailed Description
The disclosure of the present invention will be further understood in conjunction with the following detailed description of the preferred embodiments of the invention, including examples. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If the definition of a particular term disclosed in the prior art is inconsistent with any definition provided in the present invention, the definition of the term provided in the present invention controls.
The invention firstly provides a carbonate rock drainage temporary plugging steering deep acid fracturing method, which comprises the following steps:
s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction;
s2, after sand fracturing construction is finished, carrying out acid fracturing construction by adopting an alternate acid injection procedure;
s3, injecting slickwater fracturing fluid to replace after the acid fracturing construction is finished, then injecting acid-resistant temporary plugging agent to temporarily plug acid-etched cracks, and entering a step S4 if the construction pressure is raised to be lower than 5MPa after temporary plugging; if the construction pressure is increased by 5-8 MPa after temporary plugging, directly entering step S5;
s4, repeatedly executing the operations of the step S2 and the step S3 for 1-3 times until the construction pressure is increased by 5-8 MPa after temporary plugging;
s5, carrying out acid fracturing construction again by adopting an alternate acid injection procedure;
s6, injecting slickwater fracturing fluid to perform displacement operation, and ending acid fracturing construction.
Because natural microcracks of the carbonate reservoir develop relatively, in order to improve the transformation effect, the first step adopts slickwater to carry powder ceramic propping agent and fiber injection to realize the seam making of the reservoir, reduce the reservoir fluid loss and improve the crack length.
In a specific embodiment of the invention, the liquid amount for sand fracturing construction is 200-300 square, the construction displacement is 3-4 square/min, and the average sand ratio is 10% -15%.
In a specific embodiment of the invention, the liquid amount for acid fracturing construction is 150-300 square, and the construction displacement is 3-6 square/min; the construction displacement in the invention is required to be 3 selected according to the size of the well completion sleeve and the well depth data of the improved well section 1 / 2 "or 2 7 / 8 "or 3 1 / 2 "+2 7 / 8 "Combined tubing injection, go intoChecking construction pressure, wherein the maximum construction pressure of the wellhead cannot exceed the anti-internal pressure safety value of the fractured wellhead.
In a preferred embodiment of the invention, the amount of slickwater is 150 to 300 square, the amount of powdered ceramic proppant is 5 to 20 square, and the amount of fiber is 100 to 150kg.
The invention adopts the powder ceramic propping agent and the fiber seam making and filtering reducing agent, and further, the powder ceramic propping agent preferably has the particle size of 70-140 meshes of ceramic propping agent, because the particle size of 70-140 meshes of ceramic particles is small, the powder ceramic propping agent can be used for plugging microcracks, and the acid seam length and the acid seam effect are improved. Furthermore, it is worth mentioning that the pressure-bearing grade of the powder ceramic proppants is greater than the formation closure pressure of the modified wellbore section (the formation closure pressure can be obtained by a fracturing test). The fiber is preferably water-soluble polyvinyl alcohol fiber, and the average molecular weight is 60000-150000.
In a specific embodiment of the present invention, the alternating acid injection process refers to acid fracturing construction by adopting an alternating injection mode of thickened acid and steering acid, and specifically includes: each acid pressing construction is performed by alternately injecting construction according to the sequence of 30-60 parts of thickening acid, 30-60 parts of steering acid, 30-60 parts of thickening acid, 30-60 parts of steering acid and 30-60 parts of thickening acid, and the construction discharge capacity is 3-6 parts/min. The invention adopts the alternative injection mode of the thickening acid and the steering acid to construct the non-uniform etching through the viscosity change of different acid liquids, thereby increasing the diversion capability of acid etching cracks and improving the acid etching distance.
In a preferred embodiment of the invention, the viscosity of the thickening acid is 20 to 50mpa.s and the viscosity of the diverting acid is 10 to 20mpa.s.
In a preferred embodiment of the present invention, the usage amount of the slickwater fracturing fluid in the step S3 is 10-30 square, and the viscosity is 10-40 mPa.s. And S6, the dosage of the slickwater fracturing fluid in the step is the volume of the tubular column from the wellhead to the reconstruction well section, and the viscosity is 10-40 mPa.s. The viscosity of the slickwater is small, the sand carrying fracturing requirement can be met, and the low viscosity is beneficial to reducing the friction resistance of the construction pipe column and reducing the wellhead construction pressure.
In a preferred embodiment of the present invention, the thickener comprises the following components in weight percent: 18 to 20 percent of hydrochloric acid, 0.2 to 1.0 percent of thickening agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer, 0.5 to 1.5 percent of cleanup additive and the balance of water.
In a preferred embodiment of the invention, the diverting acid is composed of the following substances in weight percent: 18 to 20 percent of hydrochloric acid, 1.0 to 1.5 percent of acid liquid surfactant, 0.1 to 0.5 percent of acid-resistant resistance-reducing agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer and the balance of water.
As a preferred embodiment of the present invention, the carbonate filter-reducing temporary plugging steering deep acid fracturing method comprises the following steps:
s1, carrying 5-20 parts of powder ceramic propping agent and 100-150 kg of fiber by adopting 150-300 parts of slickwater to carry out sand fracturing construction;
s2, after the sand fracturing construction is finished, carrying out first-stage acid fracturing construction by alternately injecting the thickening acid 30-60 parts, the steering acid 30-60 parts, the thickening acid 30-60 parts, the steering acid 30-60 parts and the thickening acid 30-60 parts in sequence;
s3, after the first-stage acid fracturing construction is finished, 10-30 square slickwater fracturing fluid is injected for displacement operation, then acid-resistant temporary plugging agent is injected for temporary plugging of acid-etched cracks, the temporary plugging agent addition is designed according to the plugging performance of the acid-resistant temporary plugging agent, if the construction pressure after the first temporary plugging is increased to be lower than 5-8 MPa, the second or third temporary plugging can be carried out until the construction pressure after the temporary plugging is increased to be 5-8 MPa;
s4, after the temporary plugging construction is finished, alternately injecting the second-stage acid fracturing construction again according to the sequence of 30-60 parts of thickening acid, 30-60 parts of steering acid, 30-60 parts of thickening acid, 30-60 parts of steering acid and 30-60 parts of thickening acid;
s5, after the second-stage acid fracturing construction is finished, 10-30 square slickwater fracturing fluid is injected again to replace, acid-resistant temporary plugging agent is injected to temporarily plug the second acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s6, after the second temporary plugging construction is finished, carrying out third-stage acid fracturing construction by alternately injecting according to the sequence of 30-60 parts of thickening acid, 30-60 parts of steering acid, 30-60 parts of thickening acid, 30-60 parts of steering acid and 30-60 parts of thickening acid;
and S7, injecting slickwater fracturing fluid (the dosage of the slickwater fracturing fluid is the volume of a tubular column from a wellhead to a reconstruction well section) to perform displacement operation after the third-stage acid fracturing construction is finished, and finishing the acid fracturing construction.
The invention will be described in detail with reference to examples.
It should be noted that the implementation conditions used in the examples may be further adjusted according to the specific experimental environment, and the implementation conditions that are not noted are generally conditions in the conventional experiments. The preparation methods mentioned in the present invention are all conventional methods unless otherwise specified.
According to the present invention, slickwater is commonly used in the art and its formulation includes a thickening drag reducer, a clay stabilizer, a cleanup additive, and water. In a specific embodiment, the slick water is preferably composed of the following substances in weight percent: 0.08% of thickening drag reducer, 0.5% of cleanup additive, 0.3% of clay stabilizer and the balance of water. Further, in slick water: the thickening drag reducer is EM60, the cleanup additive is TGF-3, the clay stabilizer is COP-2, or other similar products which meet the petroleum industry standard are adopted respectively.
The thickener acid is conventional in the art and, in one particular embodiment, preferably consists of the following by weight percent: 19% of hydrochloric acid, 0.6% of thickening agent, 1.3% of corrosion inhibitor, 1.0% of iron ion stabilizer, 1.0% of cleanup additive and the balance of water; further, the thickener is CJ1, the corrosion inhibitor is HJF-94, the iron ion stabilizer is TWJ-10, the cleanup additive is CF-5A, or other similar products meeting the petroleum industry standard are adopted respectively.
Diverting acids are commonly used in the art, and in one particular embodiment, the diverting acid is preferably composed of the following by weight percent: 20% of hydrochloric acid, 1.2% of acid liquid surfactant, 0.3% of acid-resistant resistance-reducing agent, 1.2% of corrosion inhibitor, 1.0% of iron ion stabilizer and the balance of water. Further, in the diverting acid: HCl hydrochloric acid, a thickener with the model number CJ1-3 (A), an acid liquid surfactant with the model number ZCJ, a corrosion inhibitor with the model number HJF-94 and an iron ion stabilizer with the model number TWJ-10; the mutual solvent model is HRJ. Or respectively adopting other similar products which meet the petroleum industry standard.
Other materials not specifically described in the examples below were obtained from published commercial sources.
Example 1
Jing is acid pressure reforming horizon horse five, the gas reservoir burial depth is 3458-3462 m, the gas layer thickness is 3.6m, the stratum pressure coefficient is 0.92, and the stratum temperature is 105 degrees.
The method for performing on-site pilot test on the well by adopting the carbonate rock drainage temporary plugging steering depth acid fracturing method provided by the invention comprises the following steps of:
s1, carrying a powder ceramic propping agent and fibers by using slick water, and plugging micro-cracks with larger fluid loss, wherein the dosage of the slick water is 150 square, the dosage of the 100-mesh powder ceramic propping agent is 12 square, the dosage of the water-soluble polyvinyl alcohol fibers is 100kg, the construction discharge capacity is 4 square/min, and the average sand ratio is 11%;
s2, after the sand fracturing construction is finished, carrying out first-stage acid fracturing construction by alternately injecting according to the sequence of 30 parts of thickening acid, 40 parts of steering acid, 30 parts of thickening acid, 40 parts of steering acid and 30 parts of thickening acid, wherein the construction discharge capacity is 5 parts per minute; it is worth mentioning that during acid fracturing construction, according to the size of the well completion sleeve and the well depth data of the transformed well section, 31/2 'or 27/8' or 31/2 '+27/8' combined oil pipe injection is selected, and construction pressure check under different construction displacement is carried out, so that the maximum construction pressure of the well mouth does not exceed the internal pressure resistant safety value of the fracturing well mouth by 70MPa;
s3, after the first-stage acid fracturing construction is finished, injecting 35 square slickwater fracturing fluid for displacement operation, and then injecting 100Kg acid-resistant temporary plugging agent for temporary plugging of acid-etched cracks until construction pressure rises by 2-3 MPa after temporary plugging, wherein the pressure rise is not obvious;
s4, after the temporary plugging construction is finished, alternately injecting the second-stage acid fracturing construction again according to the sequence of 30 parts of the thickening acid, 40 parts of the steering acid, 30 parts of the thickening acid, 40 parts of the steering acid and 30 parts of the thickening acid, wherein the construction discharge capacity is 5 parts/min;
s5, after the second-stage acid fracturing construction is finished, injecting 35 square slickwater fracturing fluid again for displacement operation, and injecting 200Kg acid-resistant temporary plugging agent for temporary plugging of the second acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s6, after the second temporary plugging construction is finished, carrying out third-stage acid fracturing construction according to the sequence of 30 parts of thickening acid, 40 parts of steering acid, 30 parts of thickening acid, 40 parts of steering acid and 30 parts of thickening acid, wherein the construction discharge capacity is 5 parts/min;
and S7, after the third-stage acid fracturing construction is finished, injecting 38 square slickwater fracturing fluid to replace, and finishing the acid fracturing construction.
After the acid fracturing method is adopted for construction, the average daily gas yield of single well gas test is 8.3 multiplied by 10 4 m 3 And/d, which is 1.7 times of the conventional acid fracturing gas yield of the adjacent well, and a better yield increasing effect is obtained.
Example 2
The embodiment adopts the carbonate rock drainage temporary plugging steering depth acid fracturing method to carry out on-site pilot test on the jing, and the specific implementation method comprises the following steps:
s1, carrying a powder ceramic propping agent and fibers by using slick water, and plugging micro-cracks with larger fluid loss, wherein the dosage of the slick water is 200, the dosage of the 120-mesh powder ceramic propping agent is 15, the dosage of the water-soluble polyvinyl alcohol fibers is 150kg, the construction discharge capacity is 4 per minute, and the average sand ratio is 11%;
s2, after the sand fracturing construction is finished, carrying out first-stage acid fracturing construction by alternately injecting according to the sequence of 40 parts of thickening acid, 60 parts of turning acid, 40 parts of thickening acid, 60 parts of turning acid and 40 parts of thickening acid, wherein the construction discharge capacity is 5 parts/min; it is worth mentioning that during acid fracturing construction, according to the size of the well completion sleeve and the well depth data of the transformed well section, 31/2 'or 27/8' or 31/2 '+27/8' combined oil pipe injection is selected, and construction pressure check under different construction displacement is carried out, so that the maximum construction pressure of the well mouth does not exceed the internal pressure resistant safety value of the fracturing well mouth by 70MPa;
s3, after the first-stage acid fracturing construction is finished, injecting 30 square slickwater fracturing fluid for displacement operation, and then injecting 100Kg acid-resistant temporary plugging agent for temporary plugging of acid-etched cracks until construction pressure rises by 2-3 MPa after temporary plugging, wherein the pressure rise is not obvious;
s4, after the temporary plugging construction is finished, alternately injecting the second-stage acid fracturing construction again according to the sequence of 40 parts of the thickening acid, 60 parts of the steering acid, 40 parts of the thickening acid, 60 parts of the steering acid and 40 parts of the thickening acid, wherein the construction discharge capacity is 5 parts/min;
s5, after the second-stage acid fracturing construction is finished, injecting 30 square slickwater fracturing fluid again for displacement operation, and injecting 200Kg acid-resistant temporary plugging agent for temporary plugging of the second acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s6, after the second temporary plugging construction is finished, carrying out third-stage acid fracturing construction according to the sequence of 40 parts of thickening acid, 60 parts of steering acid, 40 parts of thickening acid, 60 parts of steering acid and 40 parts of thickening acid in an alternating manner, wherein the construction discharge capacity is 5 parts/min;
and S7, after the third-stage acid fracturing construction is finished, injecting 33 square slickwater fracturing fluid to replace, and finishing the acid fracturing construction.
After the acid fracturing method is adopted for construction, the average daily gas yield of single well gas test is 9.2 multiplied by 10 4 m 3 And/d, which is 1.82 times of the conventional acid fracturing gas yield of the adjacent well, and a better yield increasing effect is obtained.
In conclusion, the invention can be widely applied to acid fracturing transformation of various carbonate reservoirs, realizes effective plugging of transformation cracks through acid-resistant temporary plugging agents, forms turning cracks, and improves the transformation volume of the reservoir. The slick water is adopted to carry sand for fracturing and plugging natural cracks, so that acid liquid filtration loss is reduced, and acid liquid acting distance and acid corrosion crack flow conductivity are improved. The thickening acid and the diverting acid are alternately injected in multiple stages, so that the reaction rate of the acid liquor is reduced, and the length of acid etching cracks and the volume of acid fracturing transformation are improved.
The above description is only one preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The carbonate rock drainage temporary plugging steering deep acid fracturing method is characterized by comprising the following steps of:
s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction;
s2, after sand fracturing construction is finished, carrying out acid fracturing construction by adopting an alternate acid injection procedure;
s3, injecting slickwater fracturing fluid to replace after the acid fracturing construction is finished, and then injecting acid-resistant temporary plugging agent to temporarily plug acid-etched cracks;
s4, repeating the operations of the step S2 and the step S3 for 0-3 times until the construction pressure is increased by 5-8 MPa after temporary plugging;
s5, carrying out acid fracturing construction again by adopting an alternate acid injection procedure;
s6, injecting slickwater fracturing fluid to perform displacement operation, and ending acid fracturing construction.
2. The carbonate drainage temporary plugging steering depth acid fracturing method according to claim 1, wherein the method comprises the following steps of: the liquid amount for sand fracturing construction is 200-300 square, and the construction displacement is 3-4 square/min; the liquid amount for acid pressure construction is 150-300 square, and the construction displacement is 3-6 square/min.
3. The carbonate drainage temporary plugging steering depth acid fracturing method according to claim 1, wherein the method comprises the following steps of: in the step S1, the dosage of the slickwater is 150-300 square, the dosage of the powder ceramic propping agent is 5-20 square, and the dosage of the fiber is 100-150 kg.
4. The carbonate drainage temporary plugging diversion depth acid fracturing method according to claim 1 or 4, wherein the method comprises the following steps of: the viscosity of the slick water is 10-40 mPa.s, and the powder ceramic propping agent is a ceramic propping agent with the particle size of 70-140 meshes; the fiber is water-soluble polyvinyl alcohol fiber, and the average molecular weight is 60000-150000.
5. The carbonate rock drainage temporary plugging steering deep acid fracturing method of claim 1, wherein the alternating acid injection procedure is to perform acid fracturing construction by adopting an alternating injection mode of thickening acid and steering acid, and is specifically as follows: each acid fracturing construction is performed by alternately injecting and constructing according to the sequence of 30-60 parts of thickening acid, 30-60 parts of steering acid, 30-60 parts of thickening acid, 30-60 parts of steering acid and 30-60 parts of thickening acid, and the construction discharge capacity is 3-6 parts/min.
6. The carbonate drainage temporary plugging diversion depth acid fracturing method according to claim 5, wherein the method comprises the following steps of: the viscosity of the thickening acid is 20-50 mPa.s, and the viscosity of the steering acid is 10-20 mPa.s.
7. The carbonate drainage temporary plugging steering depth acid fracturing method according to claim 1, wherein the method comprises the following steps of: in the step S3, the dosage of the slickwater fracturing fluid is 10-40; and S6, the consumption of the slickwater fracturing fluid is the volume of the pipe column from the wellhead to the reconstruction well section.
8. The carbonate drainage temporary plugging diversion depth acid fracturing method according to claim 5, wherein the method comprises the following steps of: the thickening acid comprises the following components in percentage by weight: 18 to 20 percent of hydrochloric acid, 0.2 to 1.0 percent of thickening agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer, 0.5 to 1.5 percent of cleanup additive and the balance of water.
9. The carbonate drainage temporary plugging diversion depth acid fracturing method according to claim 5, wherein the method comprises the following steps of: the diverting acid consists of the following substances in percentage by weight: 18 to 20 percent of hydrochloric acid, 1.0 to 1.5 percent of acid liquid surfactant, 0.1 to 0.5 percent of acid-resistant resistance-reducing agent, 1.0 to 1.5 percent of corrosion inhibitor, 0.5 to 1.5 percent of iron ion stabilizer and the balance of water.
10. The carbonate drainage temporary plugging diversion depth acid fracturing method according to claim 1, comprising the following steps:
s1, carrying a powder ceramic propping agent and fibers by using slick water to carry out sand fracturing construction;
s2, after sand fracturing construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out first-stage acid fracturing construction;
s3, injecting slickwater fracturing fluid to replace after the first-stage acid fracturing construction is finished, and then injecting an acid-resistant temporary plugging agent to temporarily plug acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s4, after temporary plugging construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out second-stage acid fracturing construction;
s5, after the second-stage acid fracturing construction is finished, injecting slickwater fracturing fluid again to replace, and injecting an acid-resistant temporary plugging agent to temporarily plug the second acid-etched cracks until the construction pressure is increased by 5-8 MPa after temporary plugging;
s6, after the second temporary plugging construction is finished, adopting a thickening acid and steering acid alternate injection mode to carry out third-stage acid fracturing construction;
s7, injecting slickwater fracturing fluid to replace after the third-stage acid fracturing construction is finished, and finishing the acid fracturing construction.
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