CN113550714B - Hydraulic fracturing wax control method - Google Patents
Hydraulic fracturing wax control method Download PDFInfo
- Publication number
- CN113550714B CN113550714B CN202010337163.4A CN202010337163A CN113550714B CN 113550714 B CN113550714 B CN 113550714B CN 202010337163 A CN202010337163 A CN 202010337163A CN 113550714 B CN113550714 B CN 113550714B
- Authority
- CN
- China
- Prior art keywords
- fracturing fluid
- wax
- well
- volume
- injecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The embodiment of the invention provides a hydraulic fracturing wax control method, which comprises the following steps: providing a solid particle paraffin inhibitor and a fracturing fluid, injecting a first preset volume of the fracturing fluid into a well, and simultaneously injecting the solid particle paraffin inhibitor in the first preset volume of the fracturing fluid in the injection process of the first preset volume, so that the solid particle paraffin inhibitor is contained in the first preset volume of the fracturing fluid in the injection well, wherein the first preset volume is 3/4V, the fracturing fluid in a second preset volume is injected into the well again, the second preset volume is 1/4V, and V is the total volume of the fracturing fluid. The hydraulic fracturing wax-proofing method provided by the invention has the advantages of wide range of action of the wax-proofing agent, good wax-proofing effect and low wax-proofing cost.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation wax control, in particular to a hydraulic fracturing wax control method.
Background
Each domestic oil field is faced with the problem of wax precipitation and blockage of the oil well, and the wax precipitation of the oil well has two processes, namely, the wax is separated from the oil, and then is gathered and adhered on the wall of the oil pipe. The wax originally dissolved in the petroleum is condensed in the exploitation process due to the fact that the dissolution capacity of the petroleum for the wax is reduced, a certain amount of petroleum has certain dissolution capacity when the components, temperature and pressure are unchanged, a certain amount of paraffin can be dissolved, and when the dissolution capacity is reduced due to the change of petroleum components, temperature and pressure, a part of wax is separated out from the petroleum.
The most commonly used and effective wax control technology at present is chemical wax control, and the chemical wax control is divided into two main categories, namely liquid wax control agent wax control and solid wax control agent wax control.
Liquid paraffin inhibitor usually consists of a condensed aromatic hydrocarbon type, a polymer wax type, a surfactant type and other liquid paraffin inhibitor which are injected into an oil well periodically or continuously from an annular space of an oil sleeve for paraffin inhibition, but under the paraffin inhibition method, the paraffin inhibitor is easy to be adsorbed on the wall of the well bore, and the paraffin inhibitor has poor paraffin inhibition effect when the acting distance of the paraffin inhibitor in the well bore is too short.
The solid wax-proofing agent is divided into two kinds, one is that the solid wax-proofing agent is made into a cylinder or a square block, and is put into a specific device (such as a wax-proofing pipe or a wax-proofing device), and then is connected to the upper part or the lower part of an oil well pump or put into the bottom of a well, so that the problems of high operation cost and the like caused by throttling a shaft and moving a production pipe column are caused. The other is to coat the wax inhibitor on the surface of quartz sand, and fill the wax inhibitor quartz sand and propping agent in the artificial crack according to a fixed proportion.
Disclosure of Invention
The hydraulic fracturing wax control method provided by the embodiment of the invention is used for at least solving the technical problems that in the petroleum exploitation wax control process, the wax control effect of the wax control agent is poor, and the petroleum exploitation quality and the construction cost are affected.
In order to achieve the above object, the present invention provides a hydraulic fracturing wax control method, the method comprising:
providing a solid particle wax inhibitor and fracturing fluid, injecting a first preset volume of the fracturing fluid into a well, and simultaneously injecting the solid particle wax inhibitor in the injection process of the first preset volume of the fracturing fluid, so that the solid particle wax inhibitor is contained in the fracturing fluid of the first preset volume in the injection well, wherein the first preset volume is 3/4V.
Reinjecting a second predetermined volume of the fracturing fluid into the well, the second predetermined volume being 1/4V, the V being the total volume of the fracturing fluid provided.
Optionally, the solid particle wax inhibitor is injected simultaneously during the injection of the first preset volume of the fracturing fluid, including:
and simultaneously injecting the fracturing fluid and the solid particle wax inhibitor into the well.
Determining whether the volume of the fracturing fluid injected into the well reaches the first preset volume.
And if so, stopping injecting the solid particle wax inhibitor into the well.
If not, continuing to inject the fracturing fluid and the solid particle wax inhibitor into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
Optionally, the method of hydraulic fracturing wax control further comprises: simultaneously injecting a first propping agent in the process of injecting the first preset volume of the fracturing fluid, wherein more than 0 kg and less than or equal to 800 kg of the first propping agent are arranged in each cubic fracturing fluid.
Optionally, the solid particulate wax inhibitor comprises greater than or equal to 2% and less than or equal to 100% of the sum of the mass of the solid particulate wax inhibitor and the first proppant.
In one possible embodiment, the hydraulic fracturing wax control method further comprises: and simultaneously injecting a second propping agent in the injection process of the fracturing fluid with the second preset volume, wherein the second propping agent is a coated propping agent.
Optionally, the simultaneously injecting a second proppant during the injection of the second preset volume of the fracturing fluid includes:
and simultaneously injecting the fracturing fluid with the second preset volume and the second propping agent into the well, and stopping injecting the second propping agent into the well when all the fracturing fluid with the second preset volume is injected.
Optionally, the solid particulate wax inhibitor has a particle size equal to or less than a particle size of the first proppant, and the first proppant has a particle size equal to or less than a particle size of the second proppant.
Optionally, the particle size of the solid particulate wax inhibitor includes any one of the following particle sizes: 10/20 mesh, 20/40 mesh, 30/50 mesh, 40/60 mesh, 40/70 mesh, 60/80 mesh, 100 mesh.
In some possible embodiments, the injecting the first predetermined volume of the fracturing fluid into the well further comprises: and injecting a pad fluid into the well.
After the second predetermined volume of the fracturing fluid is injected into the well, further comprising: injecting a post-fluid into the well.
Optionally, a third proppant is included in the pad fluid, and the particle size of the third proppant is smaller than the particle size of the first proppant.
According to the hydraulic fracturing wax-proofing method provided by the invention, the solid particle wax-proofing agent is injected into the well while the fracturing fluid with the first preset volume is injected into the well (the first preset volume is 3/4 of the total volume of the fracturing fluid), and the solid particle wax-proofing agent is not added when the fracturing fluid with the second preset volume is injected into the well (the second preset volume is 1/4 of the total volume of the fracturing fluid), so that the solid particle wax-proofing agent can be paved at the middle and far ends of underground artificial cracks when hydraulic fracturing is finished, the wax-proofing agent has a wide action range and a good wax-proofing effect, and the phenomenon that the solid particle wax-proofing agent returns in a wellhead blowout stage can be prevented. In addition, the method for preventing the wax by hydraulic fracturing provided by the invention has the advantages that the wax inhibitor and the fracturing fluid are injected into the well together, the independent construction is not needed, the method is simple and safe, and the wax prevention cost is low.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly describe the drawings that are required to be used in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without any inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention;
FIG. 2 is another flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention;
FIG. 3 is another flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention;
FIG. 4 is another flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention;
FIG. 5 is another flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention;
FIG. 6 is another flow chart of a method of hydraulic fracturing wax control provided by an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, aiming at the problem of paraffin block of an oil well, the most common and effective paraffin prevention technology is chemical paraffin prevention, and the chemical paraffin prevention comprises two major types of liquid paraffin prevention agent paraffin prevention and solid paraffin prevention agent paraffin prevention, however, the paraffin prevention technology in the prior art has various disadvantages more or less. For example, the liquid wax inhibitor is easy to be adsorbed on a shaft, the action range of the wax inhibitor is small, and the wax inhibition effect is poor. For another example, solid wax-proofing agents need to be attached to the upper or lower portion of the well pump by special means or put into the well bottom, in which case the well bore would be throttled and the production string would need to be moved, resulting in increased operating costs. For another example, if the wax inhibitor is coated on the surface of the quartz sand, the wax inhibitor quartz sand and the propping agent are filled in the artificial crack according to a fixed proportion, in this case, the effective volume of the wax inhibitor is small, the effective period is short, and after the hydraulic fracturing is finished, part of the wax inhibitor coated quartz sand returns, and the flow conductivity is reduced to a large extent under high closing pressure.
In view of the above, the present invention provides a hydraulic fracturing wax-preventing method, in which a first preset volume of fracturing fluid is injected into a well, and a solid particle wax-preventing agent (the first preset volume is 3/4 of the total volume of the fracturing fluid) is injected at the same time, and a second preset volume of fracturing fluid is injected into the well, wherein the solid particle wax-preventing agent (the second preset volume is 1/4 of the total volume of the fracturing fluid) is not added, so that the solid particle wax-preventing agent can be paved at the middle and far ends of an underground artificial fracture at the end of hydraulic fracturing, the wax-preventing agent has a wide application range and a good wax-preventing effect, and the phenomenon that the solid particle wax-preventing agent returns in a wellhead blowout stage can be prevented. In addition, the method for preventing the wax by hydraulic fracturing provided by the invention has the advantages that the wax inhibitor and the fracturing fluid are injected into the well together, the independent construction is not needed, the method is simple and safe, and the wax prevention cost is low.
The invention is described below in connection with specific embodiments with reference to the accompanying drawings.
Hydraulic fracturing is a well stimulation measure with wide application prospect, and is to squeeze fracturing fluid with higher viscosity into an oil layer through a shaft by using a ground high-pressure pump. When the rate of injection of the fracturing fluid exceeds the reservoir absorption capacity, a high pressure builds up on the reservoir at the bottom of the well and when this pressure exceeds the fracture pressure of the reservoir rock near the bottom of the well, the reservoir will be forced apart and a fracture will develop. At this time, the fracturing fluid is continuously squeezed into the oil layer, and the cracks can be continuously expanded into the oil layer. In order to keep the pressed crack in an open state, a sand carrying fracturing fluid with a propping agent is squeezed into the oil layer, and after the sand carrying fracturing fluid enters the crack, the crack can be continuously extended forwards on one hand, and the pressed crack can be supported so as not to be closed on the other hand. And then injecting displacement liquid, and completely displacing the sand-carrying fracturing liquid of the well bore into the cracks and supporting the sand-carrying fracturing liquid by using propping agents. Finally, the injected high-viscosity fracturing fluid can be automatically degraded and discharged out of the shaft, one or more cracks with different lengths, widths and heights are left in the oil layer, and a new fluid channel is established between the oil layer and the shaft.
Examples
Fig. 1 is a flowchart of a hydraulic fracturing wax control method provided by an embodiment of the present invention, and referring to fig. 1, the hydraulic fracturing wax control method provided by the embodiment of the present invention includes:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 103, injecting the fracturing fluid with the first preset volume into the well, and simultaneously injecting the solid particle wax inhibitor in the fracturing fluid injection process with the first preset volume.
Step 105, re-injecting the second preset volume of fracturing fluid into the well.
Wherein the first preset volume is 3/4V, the second preset volume is 1/4V, and V is the total volume of the provided fracturing fluid
Paraffin wax and paraffin wax deposits are present in various grades of crude oil, and during oil recovery, the oil-containing mixture is produced downhole and changes with the environment (pressure and temperature). As the environment changes, so too does the composition. Once the paraffin wax is removed with the oil, it separates from the oil as a separate, semi-solid liquid phase, becomes non-flowable, and forms deposits on the flowlines, tubing and other equipment that is accessible, causing well shut-down and servicing.
The solid particle paraffin inhibitor provided in the step 101 is just a solid chemical agent for preventing paraffin deposition and growth, compared with a liquid paraffin inhibitor, the paraffin inhibitor can enter an underground artificial crack together with fracturing fluid, is paved at the middle and distal ends of the artificial crack, cannot be adsorbed on the wall of a well barrel, has wide application range and good paraffin inhibition effect, and cannot cause waste of the paraffin inhibitor.
The solid wax inhibitor is made into particles, so that the need of other specific devices (such as a wax-preventing pipe or a wax-preventing device) can be avoided, the solid wax inhibitor can be directly injected into a well together with fracturing fluid, independent construction is not needed, the solid wax inhibitor is simple and safe, the wax-preventing cost is low, the contact area with wax can be increased when the solid wax inhibitor acts on the solid wax inhibitor, the wax-preventing effect of the wax inhibitor is improved, and the effective time of wax prevention is longer.
The solid particle wax inhibitor may be composed of one or several kinds of starch, agar, polyacrylamide, PVA, etc. and may be used to support main agent for interfering wax crystal formation and growth.
The invention is not limited to the specific type of the solid particle wax inhibitor, and only needs to have a long-term wax-preventing effect on specific blocks and not influence the crack flow conductivity of the selected blocks after sand fracturing modification.
The fracturing fluid mentioned in step 101 is a heterogeneous and unstable chemical system formed by a plurality of additives according to a certain proportion, is a working fluid used for fracturing modification of an oil-gas layer, and is mainly used for transmitting high pressure formed by surface equipment into a stratum, so that the stratum is broken to form cracks and solid particle wax inhibitor and propping agent which will be mentioned below are conveyed along the cracks.
In step 103, the solid particle wax inhibitor is injected into the fracturing fluid with the first preset volume at the same time in the well, so that the fracturing fluid with the first preset volume in the well contains the solid particle wax inhibitor, wherein the first preset volume is 3/4 of the total volume of the fracturing fluid, and thus, the solid particle wax inhibitor can be paved at the middle end and the far end of the underground artificial crack, wax deposition can be prevented at the source, and the coverage action range of the wax inhibitor is improved, so that the wax inhibition effect is improved.
In step 105, when the fracturing fluid with the second preset volume is injected into the well again, no solid particle wax inhibitor is added, wherein the second preset volume is 1/4 of the total volume of the fracturing fluid, which means that the end of the artificial crack close to the ground does not contain the solid particle wax inhibitor, and the phenomenon of returning of the solid particle wax inhibitor in the wellhead blowout stage can be prevented.
Fig. 2 is another flowchart of a hydraulic fracturing wax control method according to an embodiment of the present invention based on fig. 1, and referring to fig. 2, the simultaneous injection of solid particles in the first predetermined volume of the fracturing fluid injection process may include:
and simultaneously injecting the fracturing fluid and the solid particle wax inhibitor into the well, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax inhibitor into the well, and if not, continuing to inject the fracturing fluid and the solid particle wax inhibitor into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
That is, the hydraulic fracturing wax control method provided by the invention can comprise the following steps:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 103a, injecting the fracturing fluid and the solid particle wax inhibitor into the well at the same time, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax inhibitor into the well, and if not, continuing to inject the fracturing fluid and the solid particle wax inhibitor into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
Step 105, re-injecting the second preset volume of fracturing fluid into the well.
The first preset volume is 3/4V, the second preset volume is 1/4V, and V is the total volume of the provided fracturing fluid.
Step 101 and step 105 are the same as those mentioned in the above embodiments, and are not described herein.
In step 103a, when the fracturing fluid and the solid particle wax inhibitor are injected into the well, whether the volume of the fracturing fluid in the injection well reaches the first preset volume or not can be detected and judged through electronic equipment and manual observation, if the volume of the fracturing fluid in the injection well reaches the first preset volume (namely, 3/4 of the total volume of the fracturing fluid), the solid wax inhibitor is stopped being injected into the well, and if the volume of the fracturing fluid in the injection well does not reach the first preset volume, the fracturing fluid and the solid particle wax inhibitor are continuously injected into the well until the volume of the fracturing fluid in the injection well reaches the first preset volume.
Fig. 3 is another flowchart of a hydraulic fracturing wax control method according to an embodiment of the present invention based on fig. 2, and referring to fig. 3, the hydraulic fracturing wax control method according to an embodiment of the present invention further includes: the first proppant is injected simultaneously during the injection of the first predetermined volume of fracturing fluid.
That is, the hydraulic fracturing wax control method provided by the invention can comprise the following steps:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 103b, injecting the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well at the same time, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax-proofing agent and the first propping agent into the well, and if not, continuing to inject the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
Step 105, re-injecting the second preset volume of fracturing fluid into the well.
The first preset volume is 3/4V, the second preset volume is 1/4V, V is the total volume of the provided fracturing fluid, and the first propping agent in each cubic fracturing fluid is more than 0 kg and less than or equal to 800 kg.
Step 101 and step 105 are the same as those mentioned in the above embodiments, and are not described herein.
When petroleum and natural gas deep well is mined, after the high-closure pressure low-permeability ore deposit is subjected to fracturing treatment, the stratum containing the oil gas is cracked, the oil gas is collected from channels formed by the cracks, at the moment, fluid is required to be injected into a rock base layer to enable the stratum around the shaft to generate cracks to form a channel with high laminar flow capacity, in order to keep the cracks formed after fracturing open, oil gas products can smoothly pass through, and in step 103b, a first propping agent is used for entering the stratum along with fracturing fluid to fill the cracks of the stratum together, so that the effect of supporting the cracks is achieved, the high diversion capacity is kept, the oil gas is unblocked, and the yield is increased.
The propping agent is natural sand or artificial high-strength ceramic particles with certain granularity and grading, and can be ceramsite propping agent, wherein the ceramsite propping agent is prepared by taking bauxite as a raw material and granulating and sintering the bauxite by powder, and has the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, high strength, high flow conductivity, low density, low crushing rate and the like. In the invention, the material and the manufacturing mode of the propping agent are not limited, and the propping agent can support the crack without closing.
In order to ensure the action effect of the propping agent and avoid excessive waste of the propping agent, in the embodiment of the invention, each cubic first preset volume of fracturing fluid is injected while the first propping agent is injected, wherein 0 kg is more than or equal to 800 kg.
Of course, the present invention is not limited thereto, and in some embodiments provided herein, the solid particulate wax inhibitor comprises greater than or equal to 2% and less than or equal to 100% of the sum of the mass of the solid particulate wax inhibitor and the first proppant.
Specifically, the solid particle wax inhibitor accounts for 2% -100% of the sum of the mass of the solid particle wax inhibitor and the mass of the first propping agent, the specific value is required to be tested for short-term diversion capability according to Q/SY125-2007 fracture propping agent performance index and evaluation test method under the pressure of a target layer, and the solid particle wax inhibitor is added as much as possible on the premise that the reduction amplitude of the fracture diversion capability value of the propping agent after the solid particle wax inhibitor is added is less than or equal to 10%, so that the wax inhibition pertinence is good, the wax inhibition effect is excellent, and the diversion capability of the artificial fracture is high.
For example, when the effective closing pressure of a target layer under a well of an oil field is 45MPa, when the concentration of the laid proppants is 5 kg/square meter and the closing pressure is 45MPa, if no solid particle anti-wax agent is added, the crack conductivity of the proppants is 43.7d.cm, if the solid particle anti-wax agent accounts for 2%, 5% and 8% of the mass sum of the solid particle anti-wax agent and the first proppants, respectively, the corresponding crack conductivity is 41.2d.cm, 39.5d.cm and 36.2d.cm, respectively, and the crack conductivity degradation rate is 5.72%, 9.61% and 17.2%, respectively, and since the crack conductivity value reduction amplitude is less than or equal to 10% is required, the solid particle anti-wax agent corresponding to 9.61% is 5%, that is, the optimal ratio of 5% of the solid particle anti-wax agent to the mass sum of the solid particle anti-wax agent and the first proppants.
Fig. 4 is another flowchart of a hydraulic fracturing wax control method according to the embodiment of the present invention based on fig. 3, and referring to fig. 4, the hydraulic fracturing wax control method according to the embodiment of the present invention may further include: and simultaneously injecting a second propping agent in the injection process of the fracturing fluid with the second preset volume, wherein the second propping agent is a coated propping agent.
That is, the hydraulic fracturing wax control method provided by the invention can comprise the following steps:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 103b, injecting the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well at the same time, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax-proofing agent and the first propping agent into the well, and if not, continuing to inject the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
Step 105a, injecting a second proppant while re-injecting a second predetermined volume of fracturing fluid into the well.
The first preset volume is 3/4V, the second preset volume is 1/4V, V is the total volume of the provided fracturing fluid, the first propping agent in each cubic fracturing fluid is more than 0 kg and less than or equal to 800 kg, and the second propping agent is a tectorial membrane propping agent.
In step 105a, a second propping agent, namely a coated propping agent, is injected into the well with a fracturing fluid of a second preset volume, the coated propping agent is paved at one end of the artificial crack close to the ground, when the fractured stratum is propped open, the stratum pressure presses the polymer coated propping agents together, capillary tubes which are mutually communicated are formed between the coated propping agents, when oil gas and water pass through the capillary tubes, as the coated propping agents are prepared, high-temperature treated substances are oleophilic and hydrophobic, when the oil gas rapidly infiltrates into the capillary tube wall, the liquid level in the capillary tubes is concave, the additional pressure generated by the formed bent liquid level points to the capillary tubes, the capillary tube wall of the coated propping agent cannot be infiltrated by water, and as the liquid in the capillary tubes is concave, the additional pressure generated by the formed bent liquid level deviates from the capillary tubes, the water is prevented from passing through the capillary tubes, so that the functions of promoting the oil gas permeation and preventing the water bucket are realized. And the net-shaped formed by the extruded film-coated propping agent at the near-ground end of the crack can prevent the phenomenon that a small amount of solid particle wax inhibitor contained in the first preset volume of fracturing fluid is returned in the wellhead blowout stage.
FIG. 5 is another flow chart of a method for hydraulic fracturing wax control provided in accordance with the embodiment of the present invention based on FIG. 4, with reference to FIG. 5, for simultaneous injection of a second proppant during injection of a second predetermined volume of fracturing fluid, comprising: and simultaneously injecting the fracturing fluid with the second preset volume and the second propping agent into the well, and stopping injecting the second propping agent into the well when the whole injection of the fracturing fluid with the second preset volume is completed.
That is, the hydraulic fracturing wax control method provided by the invention can comprise the following steps:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 103b, injecting the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well at the same time, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax-proofing agent and the first propping agent into the well, and if not, continuing to inject the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
And 105b, simultaneously injecting the fracturing fluid with the second preset volume and the second propping agent into the well, and stopping injecting the second propping agent into the well when the injection of the fracturing fluid with the second preset volume is completed.
The first preset volume is 3/4V, the second preset volume is 1/4V, V is the total volume of the provided fracturing fluid, the first propping agent in each cubic fracturing fluid is more than 0 kg and less than or equal to 800 kg, and the second propping agent is a tectorial membrane propping agent.
In some embodiments of the invention, the particle size of the solid particulate wax inhibitor includes any one of the following particle sizes: 10/20 mesh, 20/40 mesh, 30/50 mesh, 40/60 mesh, 40/70 mesh, 60/80 mesh, 100 mesh. And the solid particulate wax-inhibitor has a particle size equal to or smaller than that of the first proppant, and the first proppant has a particle size equal to or smaller than that of the second proppant.
It is easy to understand that making the particle size of the solid wax-proofing agent equal to or smaller than that of the first proppant makes it possible to make the solid particle wax-proofing agent free from the squeezing action of cracks and small in breakage rate, thereby making the wax-proofing effect long, and making the particle size of the solid wax-proofing agent equal to or smaller than that of the first proppant has little influence on the flow conductivity.
The solid particle wax inhibitor comprises various particle sizes, can be matched with various propping agents, and increases the adaptability of various working conditions.
It can be appreciated that the particle size of the first propping agent is equal to or smaller than that of the second propping agent, so that the width of the crack tends from the far ground end to the near ground end, the oil gas can smoothly pass through, and the oil gas production rate is increased.
FIG. 6 is another flow chart of a method for hydraulic fracturing wax control provided in accordance with the embodiment of the present invention based on FIG. 5, as shown in FIG. 6, further comprising, prior to injecting a first predetermined volume of fracturing fluid into the well: a pad is injected into the well.
After the second predetermined volume of fracturing fluid is injected into the well, further comprising: injecting a post-fluid into the well.
That is, the hydraulic fracturing wax control method provided by the invention can comprise the following steps:
step 101, providing a solid particle wax inhibitor and a fracturing fluid.
Step 102, injecting a pad fluid into the well.
Step 103b, injecting the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well at the same time, judging whether the volume of the fracturing fluid injected into the well reaches a first preset volume, if so, stopping injecting the solid particle wax-proofing agent and the first propping agent into the well, and if not, continuing to inject the fracturing fluid, the solid particle wax-proofing agent and the first propping agent into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume.
And 105b, simultaneously injecting the fracturing fluid with the second preset volume and the second propping agent into the well, and stopping injecting the second propping agent into the well when the injection of the fracturing fluid with the second preset volume is completed.
And 106, injecting a post-treatment fluid into the well.
The first preset volume is 3/4V, the second preset volume is 1/4V, V is the total volume of the provided fracturing fluid, the first propping agent in each cubic fracturing fluid is more than 0 kg and less than or equal to 800 kg, and the second propping agent is a tectorial membrane propping agent.
In step 102, the pad fluid is a fluid that pre-washes the reservoir prior to injection into the fracturing fluid. The pad fluid can adjust the reservoir absorption capacity or act as a buffer fluid to improve fluid injection efficiency and treatment or reduce formation damage.
In step 106, the post-fluid mainly replaces the fracturing fluid, the solid particle wax inhibitor and the propping agent into the stratum from the well bore, so that the well bore is prevented from being blocked by the fracturing fluid, the solid particle wax inhibitor and the propping agent.
Optionally, a third proppant may be included in the pad fluid, and the particle size of the third proppant is smaller than the particle size of the first proppant.
The pre-fluid injected before the fracturing fluid with the first preset volume is injected into the well contains the third propping agent, the particle size of the third propping agent is smaller than that of the first propping agent, the friction resistance of a shaft can be reduced, the high-angle cracks can be activated in advance, and the effect of supporting the cracks in advance is achieved.
According to the hydraulic fracturing wax-proofing method provided by the invention, the solid particle wax-proofing agent is injected into the well while the fracturing fluid with the first preset volume is injected into the well (the first preset volume is 3/4 of the total volume of the fracturing fluid), and the solid particle wax-proofing agent is not added when the fracturing fluid with the second preset volume is injected into the well (the second preset volume is 1/4 of the total volume of the fracturing fluid), so that the solid particle wax-proofing agent can be paved at the middle and far ends of underground artificial cracks when hydraulic fracturing is finished, the wax-proofing agent has a wide action range and a good wax-proofing effect, and the phenomenon that the solid particle wax-proofing agent returns in a wellhead blowout stage can be prevented. In addition, the method for preventing the wax by hydraulic fracturing provided by the invention has the advantages that the wax inhibitor and the fracturing fluid are injected into the well together, the independent construction is not needed, the method is simple and safe, and the wax prevention cost is low.
In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. are used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the referred location or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can lead the interior of two elements to be communicated or lead the two elements to be in interaction relationship. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
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 by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. A method of hydraulic fracturing wax control, the method comprising:
providing a solid particulate wax inhibitor and a fracturing fluid;
injecting a first preset volume of the fracturing fluid into a well, and simultaneously injecting the solid particle wax inhibitor in the process of injecting the first preset volume of the fracturing fluid, so that the solid particle wax inhibitor is contained in the first preset volume of the fracturing fluid in the well, wherein the first preset volume is 3/4V;
reinjecting a second predetermined volume of the fracturing fluid into the well, the second predetermined volume being 1/4V, the V being the total volume of the fracturing fluid provided;
simultaneously injecting the solid particulate wax inhibitor during the injection of the first predetermined volume of the fracturing fluid, comprising:
injecting the fracturing fluid and the solid particulate wax inhibitor into the well simultaneously;
judging whether the volume of the fracturing fluid injected into the well reaches the first preset volume;
if so, stopping injecting the solid particulate wax-proofing agent into the well;
if not, continuing to inject the fracturing fluid and the solid particle wax inhibitor into the well until the volume of the fracturing fluid injected into the well reaches the first preset volume;
simultaneously injecting a first propping agent in the process of injecting the first preset volume of the fracturing fluid, wherein each cubic volume of the first propping agent in the fracturing fluid is more than 0 kg and less than or equal to 800 kg;
simultaneously injecting a second propping agent in the process of injecting the fracturing fluid with the second preset volume, wherein the second propping agent is a coated propping agent;
the solid particulate wax inhibitor has a particle size equal to or less than the particle size of the first proppant, which is equal to or less than the particle size of the second proppant.
2. The method of hydraulic fracturing paraffin control of claim 1, wherein the solid particulate paraffin control agent comprises a percentage of the sum of the mass of the solid particulate paraffin control agent and the first proppant of greater than or equal to 2% and less than or equal to 100%.
3. The method of hydraulic fracturing paraffin control of claim 1, wherein said simultaneously injecting a second proppant during said second predetermined volume of said fracturing fluid comprises:
simultaneously injecting the second predetermined volume of the fracturing fluid and the second proppant into the well;
and stopping injecting the second propping agent into the well when the whole injection of the fracturing fluid with the second preset volume is completed.
4. The method of hydraulic fracturing wax control of any of claims 1-2, wherein the particle size of the solid particulate wax control agent comprises any of the following particle sizes:
10/20 mesh, 20/40 mesh, 30/50 mesh, 40/60 mesh, 40/70 mesh, 60/80 mesh, 100 mesh.
5. The method of hydraulic fracturing paraffin control of claim 1 or 2, wherein prior to injecting the first predetermined volume of the fracturing fluid into a well further comprises:
injecting a pad fluid into the well;
after the second predetermined volume of the fracturing fluid is injected into the well, further comprising:
injecting a post-fluid into the well.
6. The method of hydraulic fracturing paraffin control of claim 5, wherein a third proppant is included in the pad fluid and the third proppant has a particle size that is smaller than the particle size of the first proppant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337163.4A CN113550714B (en) | 2020-04-26 | 2020-04-26 | Hydraulic fracturing wax control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337163.4A CN113550714B (en) | 2020-04-26 | 2020-04-26 | Hydraulic fracturing wax control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113550714A CN113550714A (en) | 2021-10-26 |
| CN113550714B true CN113550714B (en) | 2023-07-25 |
Family
ID=78129876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010337163.4A Active CN113550714B (en) | 2020-04-26 | 2020-04-26 | Hydraulic fracturing wax control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113550714B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079292A (en) * | 2019-03-22 | 2019-08-02 | 中国石油化工股份有限公司 | High-content wax oil reservoir fracturing composition, high-content wax oil reservoir fracturing fluid and high-content wax oil reservoir composite fracturing fluid |
| CN110593816A (en) * | 2018-06-12 | 2019-12-20 | 中国石油天然气股份有限公司 | Method for preventing condensate gas well from waxing by using solid wax inhibitor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7581594B2 (en) * | 2006-03-15 | 2009-09-01 | Chemeor, Inc. | Surfactant method for improved oil recovery from fractured reservoirs |
| US7798224B2 (en) * | 2006-07-03 | 2010-09-21 | Schlumberger Technology Corporation | Rheology controlled heterogeneous particle placement in hydraulic fracturing |
| US20140027121A1 (en) * | 2012-07-26 | 2014-01-30 | WestFire Energy Ltd. | Method for hydraulically fracturing a subterranean reservoir |
| WO2015080747A1 (en) * | 2013-11-29 | 2015-06-04 | Halliburton Energy Services, Inc. | Haloalkane composition for inhibiting or dissolving asphaltene or paraffin deposits |
| RU2608380C1 (en) * | 2015-12-25 | 2017-01-18 | Шлюмберже Текнолоджи Б.В. | Method of hydraulic fracturing of underground formation |
| CN109386271A (en) * | 2017-08-03 | 2019-02-26 | 中国石油化工股份有限公司 | A kind of horizontal well wears lamination cracking method |
| CN108915637B (en) * | 2018-07-06 | 2020-04-14 | 陕西延长石油(集团)有限责任公司研究院 | Wax inhibitor added during fracturing construction and preparation method and application thereof |
| CN110511732B (en) * | 2019-09-16 | 2022-03-01 | 西南石油大学 | Inhibitor capable of preventing wax from penetrating deep into stratum and preparation method and application thereof |
| CN110982510B (en) * | 2019-11-22 | 2022-08-05 | 中国石油天然气股份有限公司 | Hydraulic fracturing propping agent and preparation method and application thereof |
-
2020
- 2020-04-26 CN CN202010337163.4A patent/CN113550714B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593816A (en) * | 2018-06-12 | 2019-12-20 | 中国石油天然气股份有限公司 | Method for preventing condensate gas well from waxing by using solid wax inhibitor |
| CN110079292A (en) * | 2019-03-22 | 2019-08-02 | 中国石油化工股份有限公司 | High-content wax oil reservoir fracturing composition, high-content wax oil reservoir fracturing fluid and high-content wax oil reservoir composite fracturing fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113550714A (en) | 2021-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7069994B2 (en) | Method for hydraulic fracturing with squeeze pressure | |
| CN105089596B (en) | A kind of hydraulic fracturing remodeling method of unconventional reservoir oil/gas well | |
| CN109113703B (en) | Fracturing method of deep shale gas V-shaped pressure curve | |
| US6192985B1 (en) | Fluids and techniques for maximizing fracture fluid clean-up | |
| Willingham et al. | Perforation friction pressure of fracturing fluid slurries | |
| US6253851B1 (en) | Method of completing a well | |
| CN104989361B (en) | A kind of method that auxiliary water horizontal well man-made fracture turns to transformation | |
| US6837309B2 (en) | Methods and fluid compositions designed to cause tip screenouts | |
| US7644761B1 (en) | Fracturing method for subterranean reservoirs | |
| US20220098955A1 (en) | Method for filling oil-gas well of fractured oil-gas reservoir with isolation particles to reduce water and increase oil production | |
| CA2921464C (en) | Well operations | |
| Inyang et al. | Development and field applications of highly conductive proppant-free channel fracturing method | |
| CN101747886A (en) | Fracturing fluid stock solution, full-filling preposition-free sand adding fracturing method and fracturing fluid cross-linking solution thereof | |
| CN112211608A (en) | Fracturing method for shale reservoir microfracture self-supporting | |
| CN109630086A (en) | A kind of energization refracturing process for old well | |
| CN111927423B (en) | Shale sand fracturing pump-stopping fracturing steering method | |
| CN113550714B (en) | Hydraulic fracturing wax control method | |
| Saldungaray et al. | Can proppants do more than hold the fracture open? | |
| Sullivan et al. | Optimizing fracturing fluid cleanup in the bossier sand using chemical frac tracers and aggressive gel breaker deployment | |
| WO2023172823A2 (en) | Strengthening fracture tips for precision fracturing | |
| Tassone et al. | Hydraulic Fracturing Challenges and Solutions for the Development of a Low Permeability Oil Reservoir–Case History from Offshore West Africa | |
| CN112112619A (en) | Shale gas underground rock stratum hydraulic fracturing method and equipment thereof | |
| Smith et al. | An Effective Technique to Reduce Bottomhole Friction Pressure During Hydraulic Fracturing Treatments | |
| CA2707209A1 (en) | Methods for maximum shock stimulation with minimum volume, minimum rate and controlled fracture growth | |
| CN110671089B (en) | Fracturing filling process parameter optimization design method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |