CN112282716A - Pulse sand adding fracturing method and pulse sand adding fracturing device for oil and gas exploitation - Google Patents
Pulse sand adding fracturing method and pulse sand adding fracturing device for oil and gas exploitation Download PDFInfo
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to the technical field of oil and gas field development, and particularly provides a pulse sand fracturing method and a pulse sand fracturing device for oil and gas exploitation, aiming at solving the problem of sand blocking in a pulse sand adding stage. The method comprises the following steps: s1, pumping a pad fluid into the well bore to manufacture a crack; s2, injecting the sand carrying liquid into the shaft in a pumping mode in a progressive sand ratio until the fracturing pressure variation in the shaft reaches the fracturing pressure variation allowable amount; s3, alternately pumping the sand-carrying liquid and the displacing liquid carrying the fibers into the well bore in a pulse mode. The method is additionally provided with the step S2, the crack opening is polished by tentatively adding sand in the early stage, the width of the crack is increased until the pressure is stable or stably reduced, a reliable space is provided for subsequent pumping, the sand blocking phenomenon is prevented, and the construction success rate and the safety are ensured.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly provides a pulse sand fracturing method and a pulse sand fracturing device for oil and gas exploitation.
Background
With the depth of oil and gas field exploration and development, the development of low-permeability and ultra-low-permeability oil and gas resources plays an increasingly important role in the China petroleum industry and becomes a main battlefield for the future China petroleum exploration and development. The low-permeability and ultra-low-permeability reservoirs have poor physical properties and are difficult to put into production naturally, and economic development can be realized only by pulse sand fracturing.
The pulse sand adding fracturing is that in the process of sand adding fracturing, a section of propping agent is pumped in by a special sand mixing truck in a pulse mode, then a section of pure liquid is pumped in the pulse mode, and the repeated alternate circulation sand adding fracturing is carried out. The sum of the proppant pulse time and the pure liquid pulse time is one pulse period.
The injection of the pulse sand fracturing pad fluid is consistent with the conventional fracturing process, and the main difference is that the proppant in the sand carrying fluid stage is injected in a pulse slug mode, and the proppant in one section and the displacement fluid in the middle section are alternately performed. The pre-fluid stage can be used for injecting gel liquid or slickwater by a pump, the sand-carrying fluid stage is used for injecting gel mixed fiber to ensure that a stable proppant slug is obtained, and the intermediate displacing fluid is mostly slickwater or guanidine gum fracturing fluid with certain concentration. At the end of the construction, a continuous proppant slug needs to be traced back to make the seam position have a stable and uniform proppant pack. The slug type pumping process is favorable for forming a channel in a crack, the middle displacing liquid pushes the previous section of propping agent into the stratum to form a section of propping agent pillar zone, and the propping agent slug achieves an isolated state due to the alternate injection of the middle displacing liquid, so that a propping agent vacuum zone with a certain space is reserved among all pillars, and a plurality of channel networks are formed after the liquid is broken and drained.
After the fracturing fluid carries the proppant in the pulse sand adding stage, the friction resistance in pipelines and cracks is further increased, and particularly when the bending degree of the cracks is large and the width of the cracks is small, a sand cluster is formed after the pulse in the first step, so that the subsequent entering of the proppant and fibers is easily blocked, and the phenomenon of sand blocking occurs.
The sand blocking phenomenon means that the pumping pressure in a fracturing pipeline exceeds the set allowable limit pressure of a train set, and if the pressure exceeds the set allowable limit pressure, the train set is flameout and stopped, and the construction is stopped; if the pumping pressure exceeds the set allowable limit pressure of the train set and reaches the out-of-control state, the shaft is filled with fibers and propping agents, so that pipelines are blocked, and serious engineering accidents occur.
In view of this, it is a technical problem that the technicians in this field need to solve the sand blocking problem in the pulse sand adding stage and ensure the smooth and safe operation of the site construction.
Disclosure of Invention
In order to solve the problem of sand blockage in the pulse sand adding stage, the invention provides a pulse sand adding fracturing method for oil and gas exploitation on the one hand.
The pulse sand fracturing method for oil and gas exploitation comprises the following steps: s1, pumping a pad fluid into the well bore to manufacture a crack; s2, injecting the sand carrying liquid into the shaft in a pumping mode in a progressive sand ratio mode until the fracturing pressure variation in the shaft reaches the fracturing pressure variation allowable amount; and S3, alternately pumping the sand-carrying liquid and the displacing liquid carrying the fibers into the well bore in a pulse mode.
In a preferable embodiment of the pulse sand fracturing method of the invention, the sand ratio of the sand-carrying fluid pumped for the first time in step S2 is greater than or equal to 5% and less than or equal to 7%.
In a preferable embodiment of the pulse sand fracturing method of the invention, the maximum sand ratio of the sand-carrying fluid pumped in step S2 is 13%.
In a preferable embodiment of the pulse sand fracturing method of the invention, the sand content in the sand-carrying fluid in step S2 is greater than or equal to 0.5m3And is less than or equal to 3.0m3。
In a preferable embodiment of the pulse sand fracturing method of the invention, the increase of the sand ratio of the sand-carrying fluid in step S2 is greater than or equal to 2% and less than or equal to 3%.
In a preferable embodiment of the pulse sand fracturing method of the present invention, step S3 specifically includes: setting the number of pulse cycles to be 12 times, and respectively pumping and injecting fiber-carrying sand-carrying liquid into the well bore according to the sand ratio of 16%, 20%, 25%, 28%, 30% and 30%.
In a preferable embodiment of the pulse sand fracturing method of the invention, the sand amount of the sand-carrying fluid pumped in each pulse period in step S3 is greater than or equal to 0.5m3And is less than or equal to5.0m3。
In a preferable embodiment of the pulse sand fracturing method of the invention, the fiber is added in the step S3 at a concentration of 10kg/m or more3。
Compared with the prior art, the pulse sand-adding fracturing method is additionally provided with the step S2 'of pumping the sand-carrying liquid in multiple times by increasing the sand ratio until the fracturing variable quantity in the well reaches the preset fracturing pressure change allowable quantity' before the step S3 'of pumping the sand-carrying liquid carrying fibers and the intermediate displacement liquid into the well alternately in a pulse mode', and the fracture opening is polished by tentatively adding sand in the early stage, so that the width of the fracture is increased until the pressure is stably or stably reduced, a reliable space is provided for subsequent pumping, and the sand blocking phenomenon is prevented, so that the construction success rate and the safety are ensured.
On the other hand, the invention also provides a pulse sand adding fracturing device for oil and gas exploitation, which comprises a sand mixing truck, a sand conveying truck and a sand conveying truck, wherein the sand mixing truck is used for mixing and stirring the fracturing fluid and sand according to a preset sand ratio to form a sand carrying fluid; the fracturing truck is communicated with the sand mixing truck and used for pumping a preset amount of front liquid into the shaft to form cracks and for pumping the sand-carrying liquid and the displacing liquid into the shaft in a pulse mode alternately; a fracture pressure sensor for detecting a fracture pressure within the wellbore; a fiber adding device which is connected with the fracturing truck and is used for mixing and stirring base fluid and fiber to form a mixture and conveying the mixture into the fracturing truck; and the controller is in communication connection with the fracturing pressure sensor and the fiber adding device and controls the fiber adding device to convey the mixture to the fracturing truck when the fracturing pressure variation in the wellbore reaches a preset fracturing pressure allowable variation.
In a preferable embodiment of the pulse sand fracturing device of the present invention, the fiber adding device includes: a loading platform for placing fibers; a dispersion device in communication with the loading platform and adapted to receive and disperse the fibers loaded by the loading platform; a pre-treatment bin, which is communicated with the dispersion device and is used for preliminarily mixing and stirring a base liquid and the fiber forming mixture; a suction pump set which is communicated with the pretreatment device and is used for pumping the base liquid into the pretreatment cabin; a mixing and stirring bin which is communicated with the pretreatment bin and is used for mixing and stirring the mixing agent again; and the output pump group is connected with the mixing and stirring bin and the controller and is used for pumping the mixed agent into the fracturing truck.
It should be noted that the pulse sand fracturing device of the present invention has all the technical effects of the pulse sand fracturing method of the pulse sand fracturing technology, and those skilled in the art can obtain the results without any doubt according to the foregoing description, so that no further description is provided herein.
Drawings
FIG. 1 is a flow chart of the steps of the pulse sand fracturing method of the present invention;
FIG. 2 is a graph of interval construction of a test well 1FI 2-3;
FIG. 3 is a graph comparing production dynamics for test wells and control wells;
fig. 4 is a block diagram of a specific embodiment of the pulse sand fracturing apparatus of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1, the pulse sand fracturing method for oil and gas field development of the invention comprises the following steps:
and S1, pumping a pad fluid into the well to form a crack.
The pad fluid is generally a solution of clear water and hydrochloric acid or a thickening agent, is generally a liquid amount used before sand is added, comprises all liquid amounts used in two procedures of trial extrusion and fracturing in fracturing construction, and has the functions of establishing bottom hole pressure, gradually reaching the fracture pressure of a stratum, pressing the stratum into fractures and simultaneously having a cleaning function.
And S2, pumping the sand-carrying fluid into the shaft in a progressive sand ratio until the variation of the fracturing pressure in the well reaches the preset allowable amount of the fracturing pressure variation.
The sand carrying liquid mainly comprises a thickening agent and a cross-linking agent, and the viscosity of the sand carrying liquid is increased by the cross-linking phenomenon after mixing, so that the purpose of carrying sand is achieved. The sand-carrying fluid, as the name implies, refers to a fluid that transports proppant, typically a mixture of sand and fracturing fluid, into the fractures of the reservoir. In the present invention, a guanidine gum fracturing fluid having a pump viscosity of 25mpa.s or more is preferably used.
S3, alternately pumping sand-carrying liquid carrying fibers and intermediate displacement liquid into the well bore in a pulse mode.
The intermediate displacement fluid mainly takes solution of a thickening agent as a main component and has the function of driving residual sand in the pipeline into a stratum so as to prevent the phenomenon of sand blockage of the pipeline. The middle displacing liquid is injected alternately to make the proppant slug reach isolated state and to leave certain space in the proppant vacuum zone between the pillars, so that after the liquid is broken and back-drained, several passage networks are formed.
Compared with the prior art, the pulse sand adding fracturing method of the pulse sand adding fracturing technology is additionally provided with the step S2 of pumping the sand carrying liquid by increasing the sand ratio in multiple times until the fracturing variable quantity in the well reaches the preset fracturing pressure change allowable quantity before the step S3 of pumping the sand carrying liquid carrying fibers and the intermediate displacement liquid into the well alternately in a pulse mode, the fracture opening is polished by early-stage tentative sand adding, the width of the fracture is increased until the pressure is stably or stably reduced, a reliable space is provided for subsequent pumping, and the sand blocking phenomenon is prevented, so that the construction success rate and the safety are guaranteed.
Further, in order to ensure that the pressure in the well is within a controllable range, it is preferable that the sand ratio of the sand-carrying fluid pumped for the first time in step S2 is greater than or equal to 5% and less than or equal to 7%.
In addition, in order to prevent the pressure runaway problem caused by the excessive pressure in the well, the maximum sand ratio of the pumped sand carrying fluid in the step S2 is preferably less than or equal to 13%.
Preferably, in order to control the pressure in the well, the sand adding amount of the tentative sand adding stage in the step S2 is greater than or equal to 0.5m3And is less than or equal to 3.0m3. Based on this amount of sanding, one skilled in the art can preset the number of tentative sandings and the sand ratio per time.
Further, in order to control the overall site operation to an optimum condition, the tentative sand adding step of step S2 is preferably performed in three steps. Of course, the number of times can also be determined according to the sand adding amount of the tentative sand adding stage and the sand ratio of each time.
In the pulse sand fracturing method, when the fracturing variation in the well is less than or equal to 3MPa, the fracturing pressure in the well is in an optimal state, and step S3 may be performed. Of course, the well fracturing pressure may also be adjusted accordingly based on the characteristic parameters of the fractured rock formation, etc.
The sand-carrying fluid pumped and injected in step S3 is specifically a sand-carrying fluid with fibers, that is, the sand-carrying fluid pumped and injected in step S3 is specifically a fracturing fluid containing proppant and fibers.
In the step S3, the sand-carrying liquid is adopted to form columnar group support in the fracture, so that the flow mode in the closed fracture is converted from seepage among the proppant particles to pipe flow among the proppant groups, and the flow conductivity in the closed fracture is greatly improved. Therefore, the fibers form a net structure by winding with each other, so that the integrity of the proppant cluster column can be maintained in the process of conveying and sedimentation, the realization of the columnar support form in the final fracture is ensured, and the method has very important significance.
Further, on the premise of ensuring the addition concentration of the fibers, the number of pulses, i.e., the number of pulse periods, in the step S3 "alternately pump and inject the fiber-carrying sand-carrying liquid and the intermediate displacement liquid into the wellbore" may be determined according to the amount of sand.
Wherein the fiber is added at a concentration of 10kg/m or more3The added concentration of the fibers refers to the ratio of the weight of the fibers to the volume of the proppant. Preferably, the pulse fibre is sanded in each pulse periodSand amount greater than or equal to 0.5m3And is less than or equal to 5.0m3。
Based on this, it is preferable that the number of the preset pulse periods is 12, and the sand ratios of the sand-carrying fluids in the 12 pulse periods are respectively: 16%, 20%, 25%, 28%, 30% and 30%.
The design basis of the sand ratio is as follows: through indoor experimental evaluation, the crack conductivity of the fibers is increased and the crack conductivity of the fibers is not increased under different sand ratios, the sand ratio is increased gradually when the mixed fibers are determined, the crack conductivity is obviously reduced when the sand ratio is lower than the sand ratio, the crack conductivity is not obviously improved when the sand ratio is higher than the sand ratio, and the sand ratio is adopted for construction in order to obtain high conductivity and reduce the difficulty of site construction.
In order to more clearly understand the pulse sand fracturing method for oil and gas field development of the present invention, it is described in detail in a practical case in conjunction with fig. 2 and 3 and table 1. Wherein, FIG. 2 is a construction curve chart of an interval of a test well 1FI2-3, FIG. 3 is a production dynamic comparison chart of the test well and a comparison well, and Table 1 is a table of a fracturing pulse fiber sand adding pump injection program example.
The practical case is as follows:
the test well 1, the whole well fracturing 4 sections, the sand adding are all designed by adopting fiber flushing and sand adding, a fourth section FI2-3 is taken as an example, see figures 2 and 3 and table 1, and the pad fluid is pumped for 40m3Then, the pulse fiber sand adding is started, and the pump injection displacement of the sand adding link is designed to be 4.0m3Min, only adding a propping agent in the first three steps, starting from 7% of sand ratio, and designing the sand amount to be 1.0m3The subsequent sand ratio is 10 percent and 13 percent, and the designed sand amount is 2m respectively3、3m3(ii) a After the pressure is stabilized, the fiber and the sand are pumped in a pulse mode, the sand ratio is designed to be 16%, 20%, 25%, 28%, 30% and 30%, the pulse frequency is 12 times, and the adding concentration of the fiber is kept to be more than 10kg/m 3.
With continued reference to fig. 3, the production dynamics of the well after fracturing is evaluated through the production dynamics with a comparison well (the same layer is transformed into 3 sections, the transformation thickness is basically consistent with the sand adding amount), and after the pulse sand adding fracturing method is adopted, the flow conductivity of the test well is enhanced due to cracks, the daily oil yield is obviously improved compared with that of the comparison well, and the lifting amplitude reaches more than 20%.
TABLE 1 example table of fracturing pulse fiber sand-adding pump injection program
In addition to the above-mentioned pulse sand fracturing method, the present invention also provides a pulse sand fracturing device for oil and gas field development, and for easy understanding, the specific structure and operation principle thereof will be described in detail with reference to fig. 4. Fig. 4 is a structural block diagram of a specific embodiment of the pulse sand fracturing device of the present invention, wherein a solid line with an arrow represents a flow direction of a carrier fluid or other objects, and a dotted line with an arrow represents a flow direction of a control signal.
Referring to fig. 4, the pulse sanding fracturing device of the present invention includes a fracturing blender truck, a fracturing pressure sensor, a fiber feeding device, and a controller.
The sand mixing truck is used for mixing and stirring the fracturing fluid and sand according to a preset sand ratio to form a sand carrying fluid.
And the fracturing truck is communicated with the sand mixing truck, is used for pumping a preset amount of front liquid into the well bore to form cracks, and is used for pumping the sand-carrying liquid and the displacing liquid into the well bore alternately in a pulse mode.
The fracture pressure sensor is used for detecting the fracture pressure in the shaft.
The fiber adding device is connected with the fracturing truck and is used for mixing and stirring the base fluid and the fibers to form a mixture and conveying the mixture into the fracturing truck.
In detail, the fiber adding device comprises a filling platform, a dispersing device, a pretreatment bin, a suction pump set, a mixing and stirring bin and an output pump set.
Wherein, filling the platform and being used for placing the fibre, for the fibre agent provides temporarily puts the space, set up the fibre simultaneously and added the entry, can realize artifical material loading, automatic feeding two parts function.
The dispersion device communicates with the filling platform for receiving and dispersing the fibers fed from the filling platform, preferably directly below the filling platform, so that the fibers fall under their own weight into the dispersion device. Preferably, the dispersing device is provided with an adding bin with a plurality of layers of screens, so that the fiber agent can uniformly enter the pretreatment bin, and the uneven addition of the fiber agent is prevented.
The pretreatment bin is communicated with the dispersing device and is used for preliminarily mixing and stirring the base liquid and the fibers to form a mixing agent, and is preferably positioned right below the dispersing device so that the fibers fall into the pretreatment bin under the action of self weight. Three long-blade stirrers are arranged in the upper part of the pretreatment bin, the stirrers are connected to a power device source, the stirring speed can be controlled, and the sucked base liquid and the sucked fibers are preliminarily mixed.
The suction pump set is communicated with the pretreatment device and is used for pumping the base liquid into the pretreatment cabin.
The mixing and stirring bin is communicated with the pretreatment bin and is used for mixing and stirring the mixing agent again, and is preferably positioned right below the pretreatment bin, so that the fibers fall into the mixing and stirring bin under the action of self weight. The mixing and stirring bin is internally provided with a plurality of short-blade stirrers at the upper part and the lower part, the stirrers are connected to a power device source, and the fiber mixed liquid which is initially mixed is fully stirred to ensure the continuity and uniformity of construction.
The controller is connected with the fracturing pressure sensor and the fiber adding device in a communication mode, and when the fracturing pressure variation in the shaft reaches the preset fracturing pressure allowable variation, the fiber adding device is controlled to convey the mixing agent to the fracturing truck.
The controller is a device integrating a computer control system and a discharge capacity control system, pulse fiber sand adding optimization design software is arranged in the controller, and the controller is mainly used for setting, monitoring and measuring discharge capacity, rotating speed and stirring conditions to ensure the construction quality of pulse sand adding; meanwhile, a construction pressure rise monitoring and early warning system is prefabricated to ensure construction safety.
In detail, an output pump set of the fiber adding device is connected with the mixing and stirring bin and the controller, if the fracturing pressure sensor detects that the fracturing pressure variation in the shaft reaches the preset fracturing pressure allowable variation, the controller controls the output pump set to start, the mixture of the fibers and the base fluid is pumped into the fracturing truck, and if the fracturing pressure sensor detects that the fracturing pressure variation in the shaft exceeds the preset fracturing pressure allowable variation, the controller controls the output pump set to stop, and the mixture of the fibers and the base fluid is stopped being input into the fracturing truck.
It should be noted that, in this embodiment, the controller controls the output pump set to be turned on or turned off, so as to achieve the purpose of inputting or stopping inputting the mixture of the fibers and the base fluid into the fracturing truck. It can be understood that on the basis of realizing the function, the controller can also control the dispersion device, the pretreatment bin, the suction pump set, the mixing and stirring bin and the output pump set to be started or stopped simultaneously, or only control one of the dispersion device, the pretreatment bin, the suction pump set, the mixing and stirring bin and the output pump set.
Therefore, the pulse sand adding fracturing device can realize early warning of pressure rise in the construction process, namely when tentative sand adding is carried out, the fracturing pressure in the shaft returns to the controller, and in the pulse sand adding stage, when the fracturing pressure in the shaft exceeds the preset fracturing pressure change allowable amount, fiber adding is automatically cut off, and the fracture form is treated by continuous low-sand-ratio sand mixing. The crack opening is polished by tentatively adding sand in the early stage, the width of the crack is increased until the pressure is stable or stably reduced, a reliable space is provided for subsequent pumping, the sand blocking phenomenon is prevented, and the construction success rate and the safety are guaranteed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A pulse sand fracturing method for oil and gas exploitation is characterized in that the design and construction method comprises the following steps:
s1, pumping a pad fluid into the well bore to manufacture a crack;
s2, injecting the sand carrying liquid into the shaft in a pumping mode in a progressive sand ratio mode until the fracturing pressure variation in the shaft reaches the fracturing pressure variation allowable amount;
and S3, alternately pumping the sand-carrying liquid and the displacing liquid carrying the fibers into the well bore in a pulse mode.
2. The pulse sand fracturing method according to claim 1, wherein the sand ratio of the sand-carrying fluid pumped for the first time in step S2 is greater than or equal to 5% and less than or equal to 7%.
3. The pulse sand fracturing method according to claim 1, wherein the maximum sand ratio of the sand-carrying fluid pumped in step S2 is 13%.
4. The pulse sand fracturing method according to claim 1, wherein the sand content in the sand-carrying fluid in step S2 is greater than or equal to 0.5m3And is less than or equal to 3.0m3。
5. The pulse sand fracturing method according to claim 1, wherein the sand ratio of the sand-carrying fluid is increased by 2% or more and 3% or less in step S2.
6. The pulse sand fracturing method according to any one of claims 1 to 5, wherein the step S3 specifically comprises:
setting the number of pulse cycles to be 12 times, and respectively pumping and injecting fiber-carrying sand-carrying liquid into the well bore according to the sand ratio of 16%, 20%, 25%, 28%, 30% and 30%.
7. The pulse sand fracturing method according to claim 6, wherein the sand amount of the sand-carrying fluid pumped in each pulse period in step S3 is greater than or equal to 0.5m3And is less than or equal to 5.0m3。
8. The pulse sand fracturing method of claim 6, wherein the fiber is added in a concentration of 10kg/m or more in step S33。
9. A pulse sanding fracturing device for oil and gas field development, comprising:
the sand mixing truck is used for mixing and stirring the fracturing fluid and sand according to a preset sand ratio to form a sand carrying fluid;
the fracturing truck is communicated with the sand mixing truck, and is used for pumping a preset amount of front liquid into a well bore to form a crack and for pumping the sand-carrying liquid and the displacing liquid into the well bore in a pulse mode alternately;
a fracture pressure sensor for detecting a fracture pressure within the wellbore;
a fiber adding device which is connected with the fracturing truck and is used for mixing and stirring base fluid and fiber to form a mixture and conveying the mixture into the fracturing truck;
and the controller is in communication connection with the fracturing pressure sensor and the fiber adding device and controls the fiber adding device to convey the mixture to the fracturing truck when the fracturing pressure variation in the wellbore reaches a preset fracturing pressure allowable variation.
10. The pulse sanding fracturing device of claim 9, wherein the fiber loading device comprises:
a loading platform for placing fibers;
a dispersion device in communication with the loading platform and adapted to receive and disperse the fibers loaded by the loading platform;
a pre-treatment bin, which is communicated with the dispersion device and is used for preliminarily mixing and stirring a base liquid and the fiber forming mixture;
a suction pump set which is communicated with the pretreatment device and is used for pumping the base liquid into the pretreatment cabin;
a mixing and stirring bin which is communicated with the pretreatment bin and is used for mixing and stirring the mixing agent again;
and the output pump group is connected with the mixing and stirring bin and the controller and is used for pumping the mixed agent into the fracturing truck.
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