CN112282724B - Low-filtration-loss long-seam-making clean fracturing process - Google Patents
Low-filtration-loss long-seam-making clean fracturing process Download PDFInfo
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- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention relates to the technical field of oil and gas field production and development, in particular to a low-fluid-loss long-seam clean fracturing process. The process adopts the weak acid clean fracturing fluid which has low residue, low damage, good temperature resistance and shearing resistance and good sand carrying performance and can realize instant use and continuous mixing on site to be matched with the novel high-efficiency fluid loss additive, greatly reduces the filtration loss of the clean fracturing fluid by utilizing the novel high-efficiency fluid loss additive, improves the crack-making performance of the clean fracturing fluid, forms a crack-making agent which can effectively reduce the damage of a reservoir stratum, can also reduce the filtration loss of the clean fracturing fluid in the reservoir stratum during the fracturing, effectively reduces the dosage of the fracturing fluid under the same fracturing scale, and realizes the low-filtration clean fracturing and long-crack making. The invention overcomes the respective defects of the clean fracturing fluid and the guanidine gum fracturing fluid, reduces the filtration loss of the clean fracturing fluid in a reservoir stratum during fracturing construction, improves the liquid crack-making efficiency and the construction efficiency, reduces the using amount of the fracturing fluid and the damage of the reservoir stratum, effectively protects the stratum, and is beneficial to saving water and reducing the comprehensive fracturing cost.
Description
Technical Field
The invention relates to the technical field of oil and gas field production and development, in particular to a low-fluid-loss long-seam clean fracturing process suitable for reservoir transformation.
Background
The fracturing operation is more and more common in the production and development process of oil and gas fields, and particularly has extremely important functions in the aspects of development of various low-permeability oil and gas fields, production and injection increasing modification of old wells, blockage removal of reservoirs and the like. In the past, the guanidine gum fracturing fluid is mostly adopted in the traditional fracturing operation, but the guanidine gum fracturing fluid has the defects of high fluid preparation cost, low construction efficiency, large friction resistance, high residue content, large reservoir damage, poor reutilization property of fracturing flowback fluid and the like; the clean fracturing fluid which is rapidly developed in recent years has the characteristics of low specific friction, low residue, small reservoir damage, good reutilization property of fracturing flowback fluid, no need of liquid preparation in advance, realization of 'instant preparation and continuous mixing', high construction efficiency and the like, can well make up for the defects of the guanidine gum fracturing fluid, but has large filtration loss and low crack-making efficiency, and has large water consumption for clean fracturing hydraulic fracturing under the same fracturing scale, particularly in water-deficient areas such as the middle and the western parts and well areas which are not beneficial to fracturing water preparation, and greatly limits the popularization and application of the clean fracturing fluid. Therefore, in order to make up for the shortage of clean fracturing fluid and promote the development of fracturing technology of various oil and gas fields, a low-fluid-loss long-fracture clean fracturing process technology which reduces the fluid loss of the clean fracturing fluid in the stratum and improves the fluid fracture efficiency and effect of the clean fracturing fluid is needed.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a low-filtration-loss long-crack clean fracturing process, which adopts weak-acid clean fracturing fluid which has low residue, low damage, good temperature resistance and shearing resistance and good sand carrying performance and can be prepared, used and continuously mixed on site to be matched with a novel high-efficiency fluid loss reducer, greatly reduces the filtration loss of the clean fracturing fluid by utilizing the novel high-efficiency fluid loss reducer, improves the crack-making performance of the clean fracturing fluid, forms a low-filtration-loss long-crack clean fracturing fluid which can effectively reduce the damage of a reservoir stratum, can reduce the filtration loss in the reservoir stratum when the clean fracturing fluid is fractured, effectively reduces the consumption of the fracturing fluid under the same fracturing scale, and realizes the low-filtration-loss clean fracturing to make long cracks. The process overcomes the respective defects of the clean fracturing fluid and the guanidine gum fracturing fluid, greatly reduces the filtration loss of the clean fracturing fluid in a reservoir stratum during fracturing construction, improves the liquid crack-making efficiency, reduces the using amount of the fracturing fluid while ensuring the long crack-making effect, effectively protects the stratum, reduces the damage of the reservoir stratum, improves the construction efficiency, and is beneficial to saving water and reducing the comprehensive fracturing cost.
The technical scheme of the invention is as follows:
the process is characterized in that a weak acid clean fracturing fluid is matched with a high-efficiency fluid loss reducer, the fluid loss of the weak acid clean fracturing fluid in a reservoir is reduced by the high-efficiency fluid loss reducer, the fracture-forming performance of the weak acid clean fracturing fluid is improved, and long fractures are formed.
Further, the construction process of the process at least comprises the following stages:
in the first stage, pumping a small amount of weak acid clean fracturing fluid to extract volume, fracturing a stratum simultaneously, forming a certain initial seam, adding the high-efficiency filtrate reducer after the fracture is opened, and adding the high-efficiency filtrate reducer according to the mass ratio of 0.1-1.0%;
in the second stage, the high-efficiency fluid loss additive is continuously added according to the proportion of 0.1-1.0 percent, meanwhile, the weak acid clean fracturing fluid is pumped and injected, and the fine silt sand or the fine ceramsite proppant with the size of 40-70 meshes is added according to the low sand ratio which is not higher than 10 percent, wherein the dosage of the proppant accounts for 10-20 percent of the total dosage of the proppant, so that the effective extension of the crack and the proppant filling at the end part of the crack are realized;
and in the third stage, pumping weak acid clean fracturing fluid, adding coarse sand or coarse ceramic grain proppant of 30-50 meshes or 20-40 meshes into the weak acid clean fracturing fluid at a high sand ratio of 10-40%, supporting a long crack with high flow conductivity in a stratum, stopping adding the high-efficiency filtrate reducer when the sand ratio reaches 20%, and continuously adding the high-efficiency filtrate reducer at a ratio of 0.1-1.0%.
Further, the mass percentage of the liquid amount used by the weak acidic clean fracturing fluid in the first stage in the total weak acidic clean fracturing fluid amount is less than or equal to 10%, and the mass percentage of the liquid amount used by the low-sand-ratio thinning proppant and the high-efficiency fluid loss additive in the second stage in the total weak acidic clean fracturing fluid amount is less than or equal to 35%; the mass percentage of the weak acid clean fracturing fluid used for adding sand with high sand ratio in the third stage in the total weak acid clean fracturing fluid is more than or equal to 55%.
Further, the weak-acid clean fracturing fluid is prepared by mixing 1.0-5.0% of oligomeric amino succinic acid fatty acid ester salt, 1.0-3.0% of potassium chloride, 0.1-0.5% of industrial formic acid and 91.5-97.9% of water according to the mass ratio.
Further, the molecular formula of the oligomeric amino succinic acid fatty acid ester salt is as follows: (C) 7 H 8 O 7 N + NR 2 ) n Cl - Wherein R is C 12~20 And n is 1~4.
Furthermore, the content of the residue of the gel breaking liquid of the weak acid clean fracturing fluid is less than or equal to 1.0mg/L, the drag reduction rate is more than or equal to 70 percent, and the construction requirement of 45 percent sand ratio is met.
Furthermore, the crosslinking time of the weak acid clean fracturing fluid is less than or equal to 30s, and the instant preparation and continuous mixing are realized.
Further, the high-efficiency fluid loss additive is calcium carbonate particles coated by paraffin.
Furthermore, the filtration-reducing efficiency of the high-efficiency fluid loss additive is more than or equal to 99 percent.
The invention has the beneficial effects that: the invention relates to a low-filtration long-crack-making clean fracturing process, which adopts a weak acid clean fracturing fluid which has low residue, low damage, good temperature resistance and shearing resistance and good sand carrying performance and can be prepared, used and continuously mixed on site to be matched with a novel high-efficiency fluid loss reducer. In the construction process, a pump injection construction mode of three stages of 'lifting displacement fractured formation + low sand ratio adding fine sand + high sand ratio adding sand' is adopted.
Drawings
FIG. 1 is a temperature-resistant shear-resistant rheological curve (FIG. a) and a variable shear rate rheological curve (FIG. b) of a weakly acidic clean fracturing fluid at 100 ℃;
FIG. 2 is a graph of the particle size distribution of the weak acid clean fracturing fluid (FIG. a) and the guanidine gum fracturing fluid (FIG. b) residue;
FIG. 3 is a temperature-resistant shear-resistant rheological curve of a repeatedly formulated fracturing fluid;
FIG. 4 is the results of an indoor simulated friction test;
FIG. 5 shows the relationship between the viscosity of the fracturing fluid and the thickening time upon contact with water.
Detailed Description
Example 1
The process is characterized in that a weak acid clean fracturing fluid is matched with a high-efficiency fluid loss reducer, the fluid loss of the weak acid clean fracturing fluid in a reservoir is reduced by the high-efficiency fluid loss reducer, the fracture-forming performance of the weak acid clean fracturing fluid is improved, and long fractures are formed.
The weakly acidic clean fracturing fluid adopted by the process has the characteristics of low residue, low damage, good temperature resistance, shearing resistance and sand carrying performance, and can be prepared, used and continuously mixed on site.
Example 2
Further, the low-fluid-loss long-seam clean fracturing process at least comprises the following steps:
in the first stage, pumping a small amount of weak acid clean fracturing fluid to lift the displacement, fracturing the stratum simultaneously, forming a certain initial seam, adding a high-efficiency filtrate reducer after the fracture is opened, and adding the high-efficiency filtrate reducer according to the mass ratio of 0.1-1.0% (the better the reservoir Kong Shenxing is, the higher the addition ratio is), wherein the first-stage fluid volume of a special reservoir difficult to be pressed is not lower than the displacement fluid volume;
in the second stage, the high-efficiency fluid loss additive is continuously added according to the proportion of 0.1-1.0 percent, meanwhile, the weak acid clean fracturing fluid is pumped and injected, and the fine silt sand or the fine ceramsite proppant with the size of 40-70 meshes is added according to the low sand ratio which is not higher than 10 percent, wherein the dosage of the proppant accounts for 10-20 percent of the total dosage of the proppant, so that the effective extension of the crack and the proppant filling at the end part of the crack are realized;
preferably, after the fine silt or the fine ceramsite proppant is added, a section of spacer fluid with the displacement fluid amount not less than that of the fine silt or the fine ceramsite proppant can be pumped and injected;
and in the third stage, a weak acid clean fracturing fluid is pumped and injected into the weak acid clean fracturing fluid, coarse sand or coarse ceramic grain proppant (40-70 meshes of proppant can be continuously adopted for a compact reservoir) with the granularity of 30-50 meshes or 20-40 meshes is added according to the high sand ratio of 10-40%, a long fracture with high flow conductivity is propped up in the stratum, the addition of the high-efficiency filtrate reducer is stopped when the sand ratio reaches 20%, and the addition proportion of the high-efficiency filtrate reducer is continuously added according to the proportion of 0.1-1.0%.
Further, the liquid amount of the weak acid clean fracturing fluid in the first stage accounts for less than or equal to 10% of the total weak acid clean fracturing fluid amount (excluding displacement fluid amount) by mass percent, but the first-stage liquid amount is not lower than the displacement fluid amount for special reservoirs which are difficult to open; the mass percentage of the weak acid clean fracturing fluid used by the low sand ratio thinning proppant and the high-efficiency fluid loss additive in the second stage to the total weak acid clean fracturing fluid (excluding displacement fluid) is less than or equal to 35%; the mass percentage of the weak acid clean fracturing fluid used for adding sand with high sand ratio in the third stage to the total weak acid clean fracturing fluid (excluding displacement fluid) is more than or equal to 55%.
Further, the weak acid clean fracturing fluid is prepared by mixing 1.0-5.0% of oligomeric amino succinic acid fatty acid lipid salt, 1.0-3.0% of potassium chloride, 0.1-0.5% of industrial formic acid and 91.5-97.9% of water according to the mass ratio.
Further, the molecular formula of the oligomeric amino succinic acid fatty acid ester salt is as follows: (C) 7 H 8 O 7 N + NR 2 ) n Cl - Wherein R is C 12~20 And n is 1~4.
Furthermore, the residue content of the gel breaking liquid of the weak acid clean fracturing fluid is less than or equal to 1.0mg/L, the resistance reduction rate is more than or equal to 70 percent, and the construction requirement of 45 percent sand ratio is met.
Furthermore, the crosslinking time of the weak acid clean fracturing fluid is less than or equal to 30s, and the instant preparation and the continuous mixing are realized.
Further, the high-efficiency fluid loss additive is calcium carbonate particles coated by paraffin.
Furthermore, the filtration-reducing efficiency of the high-efficiency fluid loss additive is more than or equal to 99 percent.
The weakly acidic clean fracturing fluid adopted in the invention has a plurality of good performances:
(1) Low damage to human body. The damage experiment test of the on-site core is shown in table 1, the damage rate of the core is between 10 and 20 percent in normal core damage evaluation, but the core damage rate can be reduced to within 10 percent or even zero damage after long-term displacement (10 days) after the fracturing fluid damage.
Table 1 core damage test
(2) Good temperature resistance and shearing resistance and viscosity recovery performance after high-speed shearing. Laboratory test at 100 deg.C and 170r -1 In the case, the fracturing fluid is continuously sheared for 90min, and the viscosity of the fracturing fluid is kept above 25mPa.s. And viscosity tests at different shear speeds at normal temperature show that the shear rate is 170r -1 Is increased to 1020r -1 Then reduced to 170r -1 The viscosity is reduced from about 60mPa.s toThe pressure of 20mPa.s was again returned to 60mPa.s. The test results are shown in fig. 1, panels a and b.
(3) Low in residue. The result of testing the particle size distribution of the residues after the weak acid clean fracturing fluid is broken by using a laser particle sizer is shown in a graph a in figure 2, the content of the residues is close to 0, a fracture permeability recovery test is carried out by filling a fracture with 20-40 meshes of propping agent, and the test result shows that the fracture permeability recovery rate is up to 93%; the particle size of the guanidine gum residue is larger as shown in a graph b in fig. 2, the residue content is higher, and the fracture permeability recovery test is carried out on the guanidine gum fracturing fluid with the concentration of 0.35%, and the permeability recovery is only 45%. See table 2.
Table 2 fracture permeability recovery test
(4) The fracturing flow-back fluid can be repeatedly prepared and utilized. After fracturing is finished, the blowout flowback fluid is discharged to a sewage pool, the sewage pool is kept stand for several hours until clean water, oil, silt and the like are separated, and a water suction pump is used for sucking out the clean water part from the middle to a water storage tank for preparing the acidic clean fracturing fluid for the next well. According to the experimental test results, the flowback fluid can still meet the construction requirements of fracturing reconstruction after being reconstituted for 4 times, and the performance and the effect of the reconstituted fracturing fluid are shown in figure 3 and table 3.
TABLE 3 Effect of repeated compounding Properties
Compared with the prior art, the invention has the following technical advantages:
(1) Compared with the conventional clean fracturing fluid technology, the technology provided by the invention overcomes the problem of large water consumption for fracturing of the clean fracturing fluid, effectively reduces the filtration loss of the clean fracturing fluid in a reservoir, improves the liquid fracturing efficiency, can effectively reduce the using amount of the fracturing fluid by more than 30% under the same fracture scale, is beneficial to saving water and saving the cost of prepared water, and simultaneously, the use amount of the fracturing fluid is reduced, so that the phenomenon that external fracturing fluid penetrates into the reservoir deeply is avoided, and the damage of external fluid to the reservoir is reduced.
(2) Compared with the guanidine gum fracturing fluid technology, the fracturing fluid used in the technology of the invention has low residue and low damage, and is beneficial to improving the fracturing effect; meanwhile, the construction mode of 'mixing immediately after use and continuous mixing' is adopted, so that the fracturing construction efficiency is improved, and the fracturing construction liquid preparation cost is reduced; secondly, the technology can effectively overcome the problem of difficult treatment of the fracturing flow-back fluid in the guanidine gum fracturing fluid technology by repeated fluid preparation application of the fracturing flow-back fluid, is favorable for relieving the environmental protection pressure of the oil field and reducing the production cost.
Example 3
On the basis of example 2, preferably, the weak acidic clean fracturing fluid is prepared by mixing 3.0% of oligomeric amino succinic acid fatty acid ester salt, 2.0% of potassium chloride, 0.3% of industrial formic acid and 94.7% of water according to the mass ratio.
Preferably, the oligomeric amino succinic acid fatty acid ester salt has the molecular formula: (C) 7 H 8 O 7 N + NR 2 ) n Cl - Wherein R is C 12~20 And n is 1~4.
The residue content of the gel breaking liquid of the weak acid clean fracturing fluid is 0.67mg/L, the resistance reduction rate is more than or equal to 70 percent, and the construction requirement of 45 percent sand ratio is met. The test data results are as follows:
(1) Residue measurement is carried out on the gel breaking liquid of the fracturing fluid system, and according to experimental results, the gel breaking liquid has the residue content of 0.67mg/L when encountering crude oil at high temperature, and the residue is residues in the industrial production process.
(2) According to the indoor friction resistance test evaluation result, the fracturing fluid system has good resistance reduction performance: an indoor discharge capacity of 23L/min (corresponding to a 5 cellular infusion discharge capacity of 9 m) 3 Min), drag reduction rate 70.99%; 35L/min indoor discharge (equivalent to 15m 5 style of 5 cellular infusion discharge) 3 Min), drag reduction rate 73.09%. As shown in fig. 4.
(3) The static sand suspending capacity of the fracturing fluid is tested, the sedimentation rate of 20-40 mesh medium-density ceramsite with the sand ratio of 10-45% in the fracturing fluid is within 0.1mm/s at normal temperature, the sand suspending condition is better, and the fracturing construction requirement is met. See table 4.
TABLE 4 Sand suspension capability test
Furthermore, the crosslinking time of the weak acid clean fracturing fluid is less than or equal to 30s, and the instant preparation and the continuous mixing are realized. According to the indoor experimental test, the thickening agent can be crosslinked and thickened (reaching the normal sand carrying degree) after being stirred for 20 seconds in water at the room temperature of 25 ℃ and the water temperature of 18 ℃, and the construction requirements of 'instant preparation and use, rapid and continuous mixing' on site can be met. As shown in fig. 5.
Further, the high-efficiency fluid loss additive is calcium carbonate particles coated by paraffin.
Further, the filtration-reducing efficiency of the high-efficiency fluid loss additive is more than or equal to 99%. According to the results of the fluid loss additive experiment, the data are shown in table 5, and the data show that the fluid loss efficiency is higher than 99% compared with the case without the fluid loss additive.
TABLE 5 filtrate loss effect test results of filtrate loss reducer
Example 4
Based on the embodiment 2, the low-fluid-loss long-seam clean fracturing process comprises the following specific implementation steps:
the first step is as follows: preparation before construction
Preparing a shaft, preparing a high-efficiency filtrate reducer and chemical materials for preparing a weak acid clean fracturing fluid according to the design dosage, directly pumping the weak acid clean fracturing fluid raw materials into a mixing tank of a sand mixing truck by directly utilizing a cross-linking pump on the sand mixing truck during fracturing construction, and continuously mixing and constructing, or preparing the weak acid clean fracturing fluid in advance and storing the weak acid clean fracturing fluid in a liquid storage tank for later use;
the second step is that: initiating fracturing work
Injecting weak acid clean fracturing hydraulic fracturing stratum according to a designed pump to form a certain initial crack, and adding a high-efficiency filtrate reducer according to a designed adding proportion after the crack is opened;
the third step: adding fine powder sand and adding efficient filtrate reducer
Adding 40-70 mesh fine silt or fine ceramsite proppant in a sand ratio of not more than 10%, and adding a high-efficiency filtrate reducer according to a proportion of 0.1-1.0%;
the fourth step: injecting sand-carrying liquid, and extracting sand ratio
Adding coarse sand or coarse ceramic grain proppant of 20-40 meshes into the high sand ratio of 10-40%, and stopping adding the high-efficiency filtrate reducer when the sand ratio is higher than 20%;
the fifth step: adding a displacement liquid for displacement;
completing fracturing construction;
and a sixth step: and (5) returning and putting into production.
Example 5
Fracturing is designed and implemented aiming at an X well of a certain oil field, and the construction displacement of an original scheme is 7.0m 3 Min, sand ratio 20.5%, proppant amount 53.0m 3 Slug amount 10.0m 3 Amount of fracturing fluid 591.6m 3 The low-filtration-loss long-seam clean fracturing process is adopted, and the construction discharge capacity is 7.0m 3 Min, sand ratio 26.1%, support dose 53.0m 3 Slug amount 6.0m 3 Amount of fracturing fluid 352.1m 3 And the amount of the fracturing fluid is reduced by 40.5 percent on the original basis.
The construction is as follows:
(1) Preparation before construction
(1) Original well pipe column
(2) Installing coiled tubing
(3) Sand washing well
The formula of the well flushing fluid comprises the following steps: clean water, flushing fluid 30m 3 The well-flushing discharge capacity is 650L/min, the mechanical impurity content of the returned flushing fluid is less than 0.2 percent, and the artificial well bottom is actually detected again.
(4) Drifting
The drift size gauge has an outer diameter of 116mm and a length of 1500mm and is led to the bottom of the artificial well.
(5) Skiving
And scraping by using a coiled tubing truck at least to the lower boundary of the current fracturing section.
(6) Pressure test
And after the well is washed to be qualified, testing the pressure of the well mouth according to the standard, wherein the pressure is required to be 45MPa, and the pressure is reduced to be less than or equal to 0.7 MPa within 30min to be qualified.
(2) Fracturing fluid and fluid loss additive preparation
Table 6 quantity table for liquid preparation
(3) Proppant
Table 7 proppant preparation table
(4) And carrying out hydraulic sand blasting perforation fracturing operation by adopting a continuous oil pipe, and carrying out fracturing construction according to a pump injection program table.
(1) Fracturing construction parameters
TABLE 8 fracturing construction parameter table
(4) Pump injection program (see Table 9)
(6) After 6 hours, the product is returned to the production.
TABLE 9 Pump-filling procedure Table
Claims (6)
1. A low-fluid-loss long-seam clean fracturing process is characterized by comprising the following steps: the process has the advantages that through the matching of the weak acidic clean fracturing fluid and the high-efficiency fluid loss additive, the fluid loss of the weak acidic clean fracturing fluid in a reservoir is reduced by using the high-efficiency fluid loss additive, the crack formation performance of the weak acidic clean fracturing fluid is improved, and long cracks are formed; the weak-acid clean fracturing fluid is prepared by mixing 1.0-5.0% of oligomeric amino succinic acid fatty acid ester salt, 1.0-3.0% of potassium chloride, 0.1-0.5% of industrial formic acid and 91.5-97.9% of water according to the mass ratio;
the construction process at least comprises the following stages:
in the first stage, pumping a small amount of weak acid clean fracturing fluid to extract volume, fracturing a stratum simultaneously, forming a certain initial seam, adding the high-efficiency filtrate reducer after the fracture is opened, and adding the high-efficiency filtrate reducer according to the mass ratio of 0.1-1.0%;
in the second stage, the high-efficiency fluid loss additive is continuously added according to the proportion of 0.1-1.0 percent, meanwhile, the weak acid clean fracturing fluid is pumped and injected, and the fine silt sand or the fine ceramsite proppant with the size of 40-70 meshes is added according to the low sand ratio which is not higher than 10 percent, wherein the dosage of the proppant accounts for 10-20 percent of the total dosage of the proppant, so that the effective extension of the crack and the proppant filling at the end part of the crack are realized;
in the third stage, pumping weak acid clean fracturing fluid, adding coarse sand or coarse ceramic grain propping agent of 30-50 meshes or 20-40 meshes in a high sand ratio of 10-40%, supporting a long crack with high flow conductivity in a stratum, stopping adding the high-efficiency filtrate reducer when the sand ratio reaches 20%, and continuously adding the high-efficiency filtrate reducer according to a proportion of 0.1-1.0%;
the mass percentage of the liquid volume used by the weak acid clean fracturing fluid in the first stage in the total weak acid clean fracturing fluid volume is less than or equal to 10%, and the mass percentage of the liquid volume used by the low sand ratio thinning proppant and the high-efficiency filtrate reducer in the second stage in the total weak acid clean fracturing fluid volume is less than or equal to 35%; the mass percentage of the weak acid clean fracturing fluid used for adding sand with high sand ratio in the third stage in the total weak acid clean fracturing fluid is more than or equal to 55%.
2. The low fluid loss long fracture clean fracturing process of claim 1, wherein: the molecular formula of the oligomeric amino succinic acid fatty acid ester salt is as follows: (C) 7 H 8 O 7 N + NR 2 ) n Cl - Wherein R is C 12~20 And n is 1~4.
3. The low fluid loss long fracture clean fracturing process of claim 1, wherein: the residue content of the gel breaking liquid of the weak acid clean fracturing fluid is less than or equal to 1.0mg/L, the drag reduction rate is more than or equal to 70 percent, and the construction requirement of 45 percent sand ratio is met.
4. The low fluid loss long fracture clean fracturing process of claim 1, wherein: the cross-linking time of the weak acid clean fracturing fluid is less than or equal to 30s, and the instant preparation and the continuous mixing are realized.
5. The low fluid loss long fracture clean fracturing process of claim 1, wherein: the high-efficiency filtrate reducer is calcium carbonate particles coated by paraffin.
6. The low fluid loss long-seam clean fracturing process of claim 1, wherein: the filtration-reducing efficiency of the high-efficiency fluid loss additive is more than or equal to 99 percent.
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