CN118088141A - Acid fracturing and sand adding composite fracturing modification method for compact carbonate rock - Google Patents
Acid fracturing and sand adding composite fracturing modification method for compact carbonate rock Download PDFInfo
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- CN118088141A CN118088141A CN202211506395.3A CN202211506395A CN118088141A CN 118088141 A CN118088141 A CN 118088141A CN 202211506395 A CN202211506395 A CN 202211506395A CN 118088141 A CN118088141 A CN 118088141A
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- 239000002253 acid Substances 0.000 title claims abstract description 58
- 239000004576 sand Substances 0.000 title claims abstract description 38
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 239000011435 rock Substances 0.000 title claims description 11
- 238000002715 modification method Methods 0.000 title abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 14
- 230000001965 increasing effect Effects 0.000 claims abstract description 10
- 238000005530 etching Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 31
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 8
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 8
- 230000008719 thickening Effects 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims 1
- 230000004048 modification Effects 0.000 abstract description 12
- 238000012986 modification Methods 0.000 abstract description 12
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 241000361919 Metaphire sieboldi Species 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 carbonate hydrocarbon Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The application provides a compact carbonate acid fracturing and sand adding compound fracturing modification method, which comprises the steps of pre-acid fracturing treatment, near-wellbore pollution removal and reservoir fracture pressure reduction; high-mucus large-displacement main cracks are formed, and medium-end reservoirs of the cracks are communicated; the self-generated retarded acid etches the middle end of the crack, reduces the construction pressure and improves the complexity of the crack; high-mucus large-displacement extension main cracks communicate with a remote well end reservoir; the low-mucus large-displacement branch cracks are formed, so that the drainage area of the reservoir is increased; the viscosified slick water with large discharge capacity carries silt to support branch cracks and small particle size ceramsite to support main cracks; adopting slick water to replace a shaft to finish fracturing construction; the application can be widely used for fracturing modification of various carbonate reservoirs, and by the acid-fracturing-sand-adding composite fracturing modification process, not only the fracturing pressure and the construction pressure are reduced, but also the acid-etching earthworm pore volume and the main fracture modification length are effectively increased, and the overall modification volume and the diversion capability of a fracture system are improved.
Description
Technical Field
The invention belongs to the technical field of fracturing, and particularly relates to a compact carbonate acid fracturing and sand adding compound fracturing modification method.
Background
In the oil and gas field, hydraulic fracturing is an important means for increasing and maintaining the output of an oil and gas well nowadays by injecting fluid and propping agent into the well at high speed by virtue of a ground high-pressure truck-mounted group and manually fracturing reservoir rocks to generate cracks and improving the flowing environment of oil and gas in the ground. The acid fracturing fluid is acid fluid, propping agent is not added, and the wall surface of the fracture is eroded into an uneven surface by the erosion action of the acid fluid in the acid fracturing process, so that the wall surface of the fracture is not completely closed after the pump is stopped for pressure relief, and the method has higher diversion capability and is suitable for carbonate hydrocarbon reservoirs.
Compared with the conventional carbonate reservoir, the compact carbonate reservoir has poor physical properties, higher clay content and more developed micro-cracks, the acid liquor has high reaction rate with the rock, the acid liquor is large in filtration loss, the acid etching crack distance is shorter, acid insoluble substances are easy to block crack channels, the acid etching crack flow conductivity is lower, and the acid pressure transformation yield increasing effect is poor. In addition, the compact carbonate reservoir has high Young's modulus and narrow crack width, the conventional sand fracturing sand adding amount and the effective crack supporting volume are relatively small, and the Shan Jingdi production range is limited.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a compact carbonate acid fracturing and sand adding compound fracturing transformation method which can increase transformation volume and single well yield.
The invention is realized by the following technical scheme:
a compact carbonate acid fracturing and sand adding compound fracturing modification method comprises the following steps:
s1: pre-acid pressure treatment, namely, removing near-wellbore pollution and reducing reservoir fracture pressure;
S2: high-mucus large-displacement main cracks are formed, and medium-end reservoirs of the cracks are communicated;
s3: the self-generated retarded acid etches the middle end of the crack, reduces the construction pressure and improves the complexity of the crack;
s4: high-mucus large-displacement extension main cracks communicate with a remote well end reservoir;
s5: the low-mucus large-displacement branch cracks are formed, so that the drainage area of the reservoir is increased;
S6: the viscosified slick water with large discharge capacity carries silt to support branch cracks and small particle size ceramsite to support main cracks;
s7: and (5) replacing the shaft by slick water to finish fracturing construction.
Preferably, in the step S1, acid pressure treatment is carried out by adopting 40m 3 of thickening acid and 2-3m 3/min of discharge capacity.
Preferably, in the step S2, a guanidine gum fracturing fluid with a large discharge capacity of 6-10 square/min and 30-40 mPa.s is adopted to make main cracks.
Preferably, in the step S3, acid etching is carried out on the middle end of the crack by adopting self-generated retarded acid 40m 3 and the discharge capacity of 2-3m 3/min.
Preferably, in the step S4, a guanidine gum fracturing fluid with a large discharge capacity of 6-10 square/min and 30-40 mPa.s is adopted to make main cracks.
Preferably, in the step S5, a 6-10 square/min large-displacement 10-20 mPa.s low-viscosity fracturing fluid is adopted to make branch cracks.
Preferably, in the step S6, large discharge of viscosified slick water is adopted to carry 70-140 meshes of silt and 40-70 meshes of ceramsite to fill the branch cracks and the main cracks.
Preferably, in the step S6, when the sand adding concentration of the proppants is lower than 200 kg/square, 10 mPa.s of slickwater fracturing fluid is adopted.
Preferably, in the step S6, when the sand adding concentration of the proppants is between 200 and 300 kg/square, a slickwater fracturing fluid with the concentration of 30 mPa.s is adopted.
Preferably, in the step S6, when the sand adding concentration of the propping agent is more than 300 kg/square, a slickwater fracturing fluid with the concentration of 40 mPa.s is adopted.
Compared with the prior art, the invention has the following beneficial technical effects:
The application provides a compact carbonate acid fracturing and sand adding compound fracturing modification method, which comprises the steps of pre-acid fracturing treatment, near-wellbore pollution removal and reservoir fracture pressure reduction; high-mucus large-displacement main cracks are formed, and medium-end reservoirs of the cracks are communicated; the self-generated retarded acid etches the middle end of the crack, reduces the construction pressure and improves the complexity of the crack; high-mucus large-displacement extension main cracks communicate with a remote well end reservoir; the low-mucus large-displacement branch cracks are formed, so that the drainage area of the reservoir is increased; the viscosified slick water with large discharge capacity carries silt to support branch cracks and small particle size ceramsite to support main cracks; adopting slick water to replace a shaft to finish fracturing construction; the application can be widely used for fracturing modification of various carbonate reservoirs, and by the acid fracturing and sand adding composite fracturing modification process, not only the fracturing pressure and the construction pressure are reduced, but also the acid etching earthworm pore volume and the main fracture modification length are effectively increased, and the overall modification volume and the diversion capability of a fracture system are improved; meanwhile, the width of the carbonate rock crack is smaller, the sand carrying difficulty of the fracturing fluid is reduced by the silt and the small-particle-size ceramsite, long-distance migration can be realized, the branch crack and the main crack are well filled, and the overall diversion capacity of the crack is improved; the use of the slick water fracturing fluid is beneficial to quick gel breaking and flowback, reduces the damage degree to a reservoir and improves the fracturing yield increasing effect.
Drawings
FIG. 1 is a flow chart of a method for modifying acid fracturing and sand adding composite fracturing of tight carbonate according to the invention;
FIG. 2 is a schematic representation of fracturing according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to specific examples, which are intended to illustrate, but not to limit, the invention.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a compact carbonate acid fracturing and sand adding compound fracturing modification method, which is shown in fig. 1 and 2 and comprises the following steps:
s1: pre-acid pressure treatment, namely, removing near-wellbore pollution and reducing reservoir fracture pressure;
S2: high-mucus large-displacement main cracks are formed, and medium-end reservoirs of the cracks are communicated;
s3: the self-generated retarded acid etches the middle end of the crack, reduces the construction pressure and improves the complexity of the crack;
s4: high-mucus large-displacement extension main cracks communicate with a remote well end reservoir;
s5: the low-mucus large-displacement branch cracks are formed, so that the drainage area of the reservoir is increased;
S6: the viscosified slick water with large discharge capacity carries silt to support branch cracks and small particle size ceramsite to support main cracks;
s7: and (5) replacing the shaft by slick water to finish fracturing construction.
Preferably, in the step S1, acid pressure treatment is carried out by adopting 40m 3 of thickening acid and 2-3m 3/min of discharge capacity.
Preferably, in the step S2, a guanidine gum fracturing fluid with a large discharge capacity of 6-10 square/min and 30-40 mPa.s is adopted to make main cracks.
Preferably, in the step 3, acid etching is carried out on the middle end of the crack by adopting self-generated retarded acid 40m 3 and the discharge capacity of 2-3m 3/min.
Preferably, in the step S4, a guanidine gum fracturing fluid with a large discharge capacity of 6-10 square/min and 30-40 mPa.s is adopted to make main cracks.
Preferably, in the step S5, a 6-10 square/min large-displacement 10-20 mPa.s low-viscosity fracturing fluid is adopted to make branch cracks.
Preferably, in the step S6, large-discharge variable-viscosity slick water is adopted to carry 70-140 meshes of silt and 40-70 meshes of ceramsite to fill branch cracks and main cracks; further, in the step S6, when the sand adding concentration of the propping agent is lower than 200 kg/square, adopting 10 mPa.s of slickwater fracturing fluid; when the sand adding concentration of the propping agent is between 200 and 300 kg/square, adopting a slickwater fracturing fluid with the concentration of 30 mPa.s; when the sand adding concentration of the propping agent is more than 300 kg/square, adopting a slickwater fracturing fluid with the concentration of 40 mPa.s.
Example 1
Aiming at a certain tight carbonate gas well, acid fracturing and sand adding composite fracturing transformation is carried out, the well depth 2620m is achieved, and according to reservoir logging interpretation results, specific transformation parameters are designed as follows: injecting and fracturing by using a 4-inch half oil pipe, wherein the discharge capacity is 8m 3/min, the sand adding rate is 52m 3, the average sand ratio is 10%, and the liquid amount is 800m 3, and the method comprises the following steps:
Step 1) adopting 40m 3 of thickening acid and 2-3m 3/min of discharge capacity to carry out acid fracturing treatment, and reducing the fracture pressure of a reservoir;
Step 2) adopting guanidine gum to crosslink fracturing fluid, and adopting 8m 3/min large-displacement main fracture to communicate with a middle well end reservoir, wherein the length of the main fracture is simulated to be 148m;
step 3) acid etching is carried out on the middle end of the crack by adopting self-generated retarded acid 40m 3 and discharge capacity 2-3m 3/min, so that construction pressure is reduced and the complexity of the crack is improved;
Step 4) adopting guanidine gum to crosslink fracturing fluid, and prolonging main cracks by 8m 3/min with large discharge capacity to communicate a far-well end reservoir;
Step 5) adopting slick water with large discharge capacity of 8m 3/min and liquid viscosity of 10 mPa.s to make branch joints;
Step 6) 8m 3/min large-displacement sand-carrying support cracks, filling branch cracks by using a 20 mPa.s variable viscosity slick water fracturing fluid to carry 70-140 meshes of silt proppants, and effectively supporting main cracks by using a 40 mPa.s variable viscosity slick water fracturing fluid to carry 40-70 meshes of small ceramsites. When the sand adding concentration of the propping agent is lower than 200 kg/square, adopting 10 mPa.s of slick water fracturing fluid; when the sand adding concentration of the propping agent is between 200 and 300 kg/square, adopting a slickwater fracturing fluid with the concentration of 30 mPa.s; when the sand adding concentration of the propping agent is more than 300 kg/square, adopting a slickwater fracturing fluid with the concentration of 40 mPa.s.
And 7) displacing the shaft by adopting slickwater with the liquid viscosity of 10 mPas and the displacement of 8m 3/min to finish fracturing construction.
The invention can be widely used for fracturing modification of various carbonate reservoirs, can effectively improve the modification length of main cracks, increase the drainage area of the reservoir and the complexity of a crack system, and realize the formation of a high-speed seepage channel and the improvement of single well yield through acid-fracturing matched sand-adding composite fracturing modification.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (10)
1. The method for modifying the acid fracturing and sand adding composite fracturing of the compact carbonate is characterized by comprising the following steps of:
s1: pre-acid pressure treatment, namely, removing near-wellbore pollution and reducing reservoir fracture pressure;
S2: high-mucus large-displacement main cracks are formed, and medium-end reservoirs of the cracks are communicated;
s3: the self-generated retarded acid etches the middle end of the crack, reduces the construction pressure and improves the complexity of the crack;
s4: high-mucus large-displacement extension main cracks communicate with a remote well end reservoir;
s5: the low-mucus large-displacement branch cracks are formed, so that the drainage area of the reservoir is increased;
S6: the viscosified slick water with large discharge capacity carries silt to support branch cracks and small particle size ceramsite to support main cracks;
s7: and (5) replacing the shaft by slick water to finish fracturing construction.
2. The method for modifying the acid fracturing and sand-adding composite fracturing of the compact carbonate rock is characterized in that the acid fracturing treatment is carried out by adopting 40m 3 of thickening acid and 2-3m 3/min of discharge capacity in the step S1.
3. The method for modifying the acid fracturing and sand fracturing of the compact carbonate rock is characterized in that a guanidine gum fracturing fluid with large discharge capacity of 6-10 square/min and 30-40 mPa.s is adopted to make main cracks in the step S2.
4. The method for modifying the acid fracturing and sand adding composite fracturing of the compact carbonate rock is characterized in that in the step S3, acid etching is carried out on the middle end of the fracture by adopting self-generated retarded acid 40m 3 and discharge capacity 2-3m 3/min.
5. The method for modifying the acid fracturing and sand fracturing of the compact carbonate rock is characterized in that 6-10 square/min large-displacement 30-40 mPa.s guanidine gum fracturing fluid is adopted to produce main cracks in the step S4.
6. The method for modifying the acid fracturing and sand fracturing of the compact carbonate rock is characterized in that in the step S5, a 6-10 square/min large-displacement 10-20 mPa.s low-viscosity fracturing fluid is adopted to form branch cracks.
7. The method for modifying the acid fracturing and sand adding composite fracturing of the compact carbonate rock according to claim 1, wherein in the step S6, a large discharge of variable viscosity slick water is adopted to carry 70-140 meshes of powder sand and 40-70 meshes of ceramsite to fill branch cracks and main cracks.
8. The method for modifying compact carbonate acid fracturing and sand fracturing according to claim 1, wherein in the step S6, when the sand concentration of the propping agent is lower than 200 kg/square, 10 mPa.s of slick water fracturing fluid is adopted.
9. The method for modifying compact carbonate acid fracturing and sand fracturing according to claim 1, wherein in the step S6, when the sand concentration of the propping agent is 200-300 kg/square, a slickwater fracturing fluid with the concentration of 30 mPa.s is adopted.
10. The method for modifying the acid fracturing and sand fracturing of compact carbonate according to claim 1, wherein in the step S6, when the sand concentration of a propping agent is more than 300 kg/square, a slickwater fracturing fluid with the concentration of 40 mPa.s is adopted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211506395.3A CN118088141A (en) | 2022-11-28 | 2022-11-28 | Acid fracturing and sand adding composite fracturing modification method for compact carbonate rock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211506395.3A CN118088141A (en) | 2022-11-28 | 2022-11-28 | Acid fracturing and sand adding composite fracturing modification method for compact carbonate rock |
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