CN106401554A - Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method - Google Patents
Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method Download PDFInfo
- Publication number
- CN106401554A CN106401554A CN201611016720.2A CN201611016720A CN106401554A CN 106401554 A CN106401554 A CN 106401554A CN 201611016720 A CN201611016720 A CN 201611016720A CN 106401554 A CN106401554 A CN 106401554A
- Authority
- CN
- China
- Prior art keywords
- carbon dioxide
- sand
- fracturing
- pump
- oil
- 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.)
- Pending
Links
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 444
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 222
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 222
- 239000004576 sand Substances 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 148
- 239000007788 liquid Substances 0.000 claims abstract description 77
- 230000008569 process Effects 0.000 claims abstract description 74
- 238000010276 construction Methods 0.000 claims abstract description 71
- 239000002562 thickening agent Substances 0.000 claims abstract description 62
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 22
- 239000007924 injection Substances 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims description 37
- 230000008719 thickening Effects 0.000 claims description 30
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- 238000003860 storage Methods 0.000 claims description 26
- 238000012360 testing method Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 13
- 239000004519 grease Substances 0.000 claims description 8
- 229920005549 butyl rubber Polymers 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002309 gasification Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 62
- 239000003921 oil Substances 0.000 description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000003345 natural gas Substances 0.000 description 8
- 239000012071 phase Substances 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 206010017076 Fracture Diseases 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000010779 crude oil Substances 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000009418 renovation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention provides an oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method. The method includes the liquid carbon dioxide pump injection ground flow, the thickener sanding ground flow and sand fracturing operation after entering-well mixing which are mutually independent. The invention further provides an oil and gas well supercritical carbon dioxide non-closed sand fracturing system. By means of the process method, the aim of achieving supercritical carbon dioxide sand fracturing construction through conventional fracturing equipment is achieved, the disadvantages of dependence of non-closed supercritical carbon dioxide sand fracturing on closed equipment, large construction risks, large construction control difficulty and high construction cost are overcome while various technical requirements of supercritical carbon dioxide sand fracturing are met, and the generalizability of the supercritical carbon dioxide sand fracturing technology is improved.
Description
Technical Field
The invention relates to an oil-gas well supercritical carbon dioxide non-closed sand fracturing system and method, and belongs to the technical field of oil-gas well fracturing.
Background
Oil and gas resources in China are abundant in reserves, but because most of the oil and gas resources are low-permeability or even ultra-low-permeability reservoirs, the natural productivity is low or even basically no natural productivity exists, and the oil and gas wells generally can be economically developed after yield increase transformation. At present, the most used stimulation improvement measure in the development of oil and gas resources such as shale gas and dense oil and gas is hydraulic fracturing, which mostly uses water-based fracturing fluid as a fracturing medium for fracturing. However, the water-based fracturing fluid often causes damage to a reservoir and influences the effective seepage capability of the reservoir due to the retention of underground residues, water lock, water-sensitive mineral expansion and the like, and the rock breaking capability and the action range of the water-based fracturing fluid are limited, so that the fracturing modification effect and the productivity gain of an oil-gas well are influenced. In addition, a large amount of flowback fluid brings huge environmental protection pressure and treatment cost.
The supercritical carbon dioxide sand fracturing technology started in the 80 th century. Compared with the traditional fracturing process mainly using water-based fracturing fluid, the supercritical carbon dioxide fracturing has the following advantages: 1) the fracturing liquid system has no water phase, completely eliminates water-sensitive and water-lock damages, and is particularly suitable for strong water-sensitive and strong water-lock reservoirs; 2) the supercritical carbon dioxide has extremely low interfacial tension and can be completely and quickly returned from the reservoir after being heated and gasified; 3) the fracturing fluid has no residues, has better cleaning effect on the support cracks and the support diversion bed, and is beneficial to keeping higher crack diversion capacity and longer effective crack length; 4) the carbon dioxide has higher solubility in the crude oil of the stratum, so that the viscosity of the crude oil of the stratum can be reduced, and the fluidity of the crude oil is improved; 5) the supercritical carbon dioxide has extremely low interfacial tension and theoretically has a promoting effect on the analysis of adsorbed gas in a natural gas reservoir. The advantages enable the supercritical carbon dioxide dry fracturing to become a very promising oil and gas well production increase transformation technology.
However, in the supercritical carbon dioxide sand fracturing construction of the oil and gas well, the phase change process of the carbon dioxide needs to be strictly controlled so as to fully exert the advantages of the transformation effect. FIG. 1 is a process diagram of the phase change of carbon dioxide during the addition of carbon dioxide to sand. Because carbon dioxide is influenced by temperature and pressure, the phase change is extremely violent, and the phase control difficulty is high, so the method is usually implemented by adopting closed equipment, but also has the problems of short resources of the closed equipment, high construction cost, high construction risk of the closed equipment and the like.
Based on the above requirements and the problems faced by the above, it is urgently needed to design a supercritical carbon dioxide fracturing process method which can be performed without a closed device and can be popularized in a large scale while ensuring the construction effect, so as to meet the requirement of large-scale economic development of oil and gas resources.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a supercritical carbon dioxide non-closed sand fracturing method for an oil and gas well.
In order to achieve the aim, the invention provides an oil-gas well supercritical carbon dioxide non-closed sand fracturing method, which comprises a liquid carbon dioxide pump injection ground flow, a thickener sand adding ground flow and sand adding fracturing operation after well entering and mixing which are mutually independent; wherein,
the process of pumping the liquid carbon dioxide into the ground comprises the following specific operations:
pressurizing liquid carbon dioxide by a carbon dioxide booster pump, inputting the liquid carbon dioxide into a carbon dioxide fracturing pump truck through a low-pressure pipeline, and pumping the liquid carbon dioxide into a well through a high-pressure pipeline; meanwhile, in the process of injecting liquid carbon dioxide by a pump, a proportional pump is arranged on a carbon dioxide booster pump to pump and inject a thickening drag reducer according to a designed proportion, and the thickening drag reducer is ensured to be uniformly dissolved with the liquid carbon dioxide before entering a carbon dioxide fracturing pump;
the ground flow of the thickening agent for adding sand comprises the following specific operations:
mixing a sand-adding thickening agent and fracturing sand in a sand mixing truck, inputting the mixture into a fracturing pump truck through a low-pressure pipeline, and pumping the obtained mixture into a well through a high-pressure pipeline;
the liquid carbon dioxide pump injection ground flow and the thickener sand adding ground flow are respectively pumped into the well, and the fluids are mixed to carry out sand adding fracturing operation.
Preferably, the carbon dioxide fracturing pump truck is a carbon dioxide fracturing pump truck equipped with a butyl rubber seal or a metal seal.
Preferably, the interface of the high-pressure pipeline adopted in the liquid carbon dioxide pumping ground flow path is sealed by using sealing grease.
Preferably, the discharge capacity, the pumping pressure and the temperature need to be monitored in real time in the process of pumping the liquid carbon dioxide to the ground, so that the phase state of the liquid carbon dioxide is continuous and stable in the pumping process, and the liquid carbon dioxide is prevented from being gasified.
Preferably, the sand-adding thickening agent needs to be sampled and detected by a sand mixer at variable time in the ground flow of the thickening agent and the sand, so that the risks of surface evacuation, insufficient liquid supply and insufficient sand suspension capacity in the fracturing construction process are avoided. Further preferably, the sampling test comprises the test of viscosity, fluidity and sand suspending capacity of the sand-adding thickening agent.
According to the oil-gas well supercritical carbon dioxide non-closed sand fracturing method, when liquid carbon dioxide is pumped and injected by a carbon dioxide pump in a ground process, the efficient thickening drag reducer suitable for supercritical carbon dioxide fracturing needs to be stirred and injected in the whole process; the carbon dioxide efficient thickening drag reducer needs to meet the requirements of instant dissolution, rapid thickening drag reduction, shear resistance, high temperature resistance and the like in liquid carbon dioxide and supercritical carbon dioxide, and the thickening drag reduction performance of the carbon dioxide efficient thickening drag reducer meets the requirements of construction conditions.
According to the oil-gas well supercritical carbon dioxide non-closed sand fracturing method, a thickener sand adding ground flow adopts a conventional sand mixing truck, and sand adding thickener is used for ground sand mixing and sand suspending; the sand-adding thickening agent has enough viscosity and dynamic sand suspending performance, and the sand suspending performance of the sand-adding thickening agent after being mixed with carbon dioxide can still meet the sand-adding requirement.
The technical scheme of the method is as follows.
In the first aspect, considering that the liquid carbon dioxide is gasified under the influence of temperature and pressure, the invention adopts a liquid carbon dioxide storage tank/tank car → a carbon dioxide booster pump → a carbon dioxide fracturing pump truck equipped with a butyl rubber or metal sealing piece → a high-pressure pipeline for sealing an interface by using sealing grease to be connected with a wellhead ground flow in sequence, thereby ensuring that the liquid carbon dioxide keeps stable liquid phase before entering a well.
In a second aspect, the invention provides a thickening and drag reducing agent suitable for supercritical carbon dioxide fracturing to increase viscosity and reduce drag of carbon dioxide, considering the large friction resistance of liquid carbon dioxide (as shown in fig. 2). When liquid carbon dioxide is pumped, a proportional pump is arranged on the carbon dioxide booster pump to pump and pump the thickening drag reducer according to the designed proportion, and the thickening drag reducer is ensured to be uniformly dissolved before entering a carbon dioxide fracturing pump truck. The on-way friction resistance of liquid carbon dioxide in the pumping process is reduced by using the effects of instant dissolution, rapid thickening and drag reduction of a thickening drag reducer in carbon dioxide, so that higher pumping capacity and intra-seam net pressure of the carbon dioxide are realized, and the seam forming capability of underground fracturing fluid is enhanced.
In the third aspect, in consideration of the shortage of resources of closed equipment used for closed carbon dioxide fracturing construction, large construction risk and high construction cost, the sand adding thickener suitable for supercritical carbon dioxide fracturing is utilized and the sand adding construction is carried out by a conventional sand mixing truck. The sand thickener is pumped along the surface flow of the storage tank → conventional sand mixing truck → conventional frac pump truck → high pressure line connected to the wellhead in sequence. The viscosity of the sand-adding thickening agent and the excellent sand suspending capacity are utilized to carry out ground sand mixing and pumping, and the thickening performance of the sand-adding thickening agent on carbon dioxide is utilized to further ensure that the sand-carrying liquid has enough sand suspending capacity after being mixed with the carbon dioxide, so that the risk of sand setting and sand blocking is reduced.
In the fourth aspect, in consideration of the high risk of the supercritical carbon dioxide fracturing construction project, the invention adopts mutually independent carbon dioxide injection ground flow and thickener sand-adding ground flow, and the two independent ground flows respectively pump the injected fluid into the well and then mix the pumped fluid. Once risks occur in one set of ground flow in the construction process, risk treatment can be carried out under the condition that the other set of ground flow is not influenced.
The invention also provides a system for realizing the supercritical carbon dioxide non-closed sand fracturing method for the oil and gas well, which comprises mutually independent liquid carbon dioxide pumping ground equipment and thickener sand-adding ground equipment;
the liquid carbon dioxide pumping ground equipment comprises a plurality of liquid carbon dioxide storage tanks, a thickening drag reducer storage tank, a carbon dioxide booster pump and a plurality of carbon dioxide fracturing pump trucks;
the plurality of liquid carbon dioxide storage tanks are respectively connected with inlets of the carbon dioxide booster pumps through pipelines, outlets of the carbon dioxide booster pumps are respectively connected with inlets of the plurality of carbon dioxide fracturing pump trucks through low-pressure pipelines, and outlets of the plurality of carbon dioxide fracturing pump trucks are respectively connected with a wellhead through high-pressure pipelines;
the carbon dioxide booster pump is provided with a proportional pump which is used for pumping the thickening drag reducer in the pump injection thickening drag reducer storage tank;
the thickener sand-adding ground equipment comprises a plurality of sand-adding thickener storage tanks, sand tanks, a sand mixer truck and a plurality of fracturing pump trucks;
the sand tank is connected with an inlet of the sand mixing truck through a pipeline;
the sand-adding thickener storage tanks are connected with the inlets of the sand mixing trucks through pipelines, the outlets of the sand mixing trucks are respectively connected with the inlets of the fracturing pump trucks through low-pressure pipelines, and the outlets of the fracturing pump trucks are respectively connected with a wellhead through high-pressure pipelines.
Preferably, the carbon dioxide fracturing pump truck is a carbon dioxide fracturing pump truck equipped with a butyl rubber seal or a metal seal.
Preferably, the interface of the high-pressure pipeline adopted in the liquid carbon dioxide pumping ground flow path is sealed by using sealing grease.
Preferably, a safety valve and a pressure relief valve are arranged between any two valves on all carbon dioxide suction pipelines in the liquid carbon dioxide pumping ground equipment.
The oil-gas well supercritical carbon dioxide non-closed sand fracturing system and method provided by the invention have the following advantages: the aim of performing supercritical carbon dioxide sand adding fracturing construction by using conventional fracturing equipment is fulfilled by utilizing a mutually independent carbon dioxide ground pumping flow and a ground sand mixing and carrying flow (a thickener sand adding ground flow) and matching with a high-efficiency thickening drag reducer and a sand adding thickener which are suitable for supercritical carbon dioxide sand adding fracturing, the method overcomes the disadvantages that the existing supercritical carbon dioxide sand fracturing construction needs to depend on closed equipment, has large construction control difficulty, large construction technical risk and high construction cost while meeting various technical requirements of supercritical carbon dioxide sand fracturing, and provides the supercritical carbon dioxide sand fracturing construction which can be realized by conventional fracturing equipment, has controllable construction risk, small construction difficulty and lower construction cost, and simultaneously improves the popularization of the supercritical carbon dioxide sand fracturing technology.
In addition, under the condition that the amount of the construction carbon dioxide is equivalent, compared with the conventional full-closed supercritical carbon dioxide dry fracturing construction using a conventional thickening agent, the fracturing construction is carried out by adopting the supercritical carbon dioxide non-closed sand-adding fracturing process method for the oil-gas well, so that higher discharge capacity, sand-adding amount and sand ratio can be supported; meanwhile, the oil-gas well supercritical carbon dioxide non-closed sand fracturing process method can obviously improve the productivity.
Drawings
Fig. 1 is a schematic diagram of the change of the phase state of carbon dioxide in the conventional supercritical carbon dioxide sand fracturing process.
FIG. 2 is a graph of a conventional liquid carbon dioxide column flow friction test.
FIG. 3 is an overall flow chart of the supercritical carbon dioxide non-closed sand fracturing process method for the oil and gas well provided by the invention.
FIG. 4 is a schematic view of an oil and gas well supercritical carbon dioxide non-closed sand fracturing system provided by the invention; wherein, in fig. 4, each item is: 1 is a liquid carbon dioxide storage tank; 2 is a carbon dioxide thickening drag reducer storage tank; 3, a sand thickener storage tank; 4, adding a pump low-pressure hose line to the liquid carbon dioxide; 5 is a carbon dioxide thickening drag reducer connecting proportional pump low-pressure pipeline; 6 is a water feeding low-pressure pipeline of the sand thickening agent continuous sand mixing truck; 7 is a carbon dioxide thickening drag reducer proportional pump; 8 is a liquid carbon dioxide booster pump; 9 is a sand mixing truck for conventional sand adding fracturing; 10 is a sand tank; 11 is a liquid carbon dioxide pump injection low-pressure pipeline; 12 is a sealed fracturing pump truck; 13 is a liquid carbon dioxide pump injection high-pressure pipeline; 14 is a sand thickening agent and sand carrying liquid pumped high pressure pipeline; 15 is a conventional fracturing pump truck; 16 is a low-pressure pipeline filled with sand thickening agent and sand carrying liquid by a pump; 17 is a liquid carbon dioxide pump injection flow ground open flow pipeline; 18 is a sand thickener is added and sand carrying liquid is pumped into the process of ground open flow pipeline; 19 is a blow-off valve; 20 is a fracturing wellhead; 21 is an instrument vehicle; 22 is a blower; 23 is an ambulance; 24 is a fire engine; and 25 is a wind vane.
Figure 5 is a graph comparing the pre-pressure and post-pressure production of tight sandstone gas well at 5 different layers of a C hypotonic sandstone gas field in the application example 1 of the invention.
Figure 6 is a comparison graph of the before-pressing and after-pressing performances of the tight sand gas well at different layers of 15O-gas fields in the application example 3 of the invention.
Fig. 7 is a comparison graph of the fracturing parameters of the process method of the present invention and the closed supercritical carbon dioxide sand fracturing method applied to the a gas field CL tight sandstone well in the application example 4 of the present invention.
Fig. 8 is a graph showing the yield after fracturing by applying the process method of the present invention and the closed supercritical carbon dioxide sand fracturing method to the a gas field CL tight sandstone well in the application example 4 of the present invention.
Fig. 9 is a graph showing a comparison of the fracturing parameters of the process of the present invention applied to AC tight oil reservoirs in the 25 zones of the EF field and the fracturing of reservoirs in the same layer in the 38 zones of the EF field using the conventional closed supercritical carbon dioxide method in the application example 5 of the present invention.
Fig. 10 is a graph showing the relationship between the fracturing construction of AC tight oil reservoirs in the 25 th region of the EF oilfield by applying the process of the present invention to the same-layer reservoirs in the 38 th region of the EF oilfield by applying the conventional closed supercritical carbon dioxide method, and the capacity after fracturing.
Fig. 11 is a graph showing a comparison of the fracturing parameters of the LM shale gas reservoir in the WY-2 region of the SC gas field in the application example 6 of the present invention and the conventional closed supercritical carbon dioxide sand fracturing method for the LM shale gas reservoir in the same layer of the FL gas field.
Fig. 12 is a graph showing the comparison of the capacity after fracturing by applying the process method of the present invention to the LM shale gas reservoir in the WY-2 region of the SC gas field and applying the conventional closed supercritical carbon dioxide sand fracturing method to the LM shale gas reservoir at the same layer of the FL gas field in the application example 6 of the present invention.
Detailed Description
For a better understanding of the technical features, objects and advantages of the present invention, reference will now be made in detail to the following embodiments of the present invention, which are illustrated in the accompanying drawings, and the accompanying drawings are included to illustrate the present invention.
Example 1
A supercritical carbon dioxide non-closed sand fracturing system for an oil and gas well comprises mutually independent liquid carbon dioxide pump injection ground equipment and thickener sand adding ground equipment;
the liquid carbon dioxide pumping ground equipment comprises a plurality of liquid carbon dioxide storage tanks, a thickening drag reducer storage tank, a carbon dioxide booster pump and a plurality of carbon dioxide fracturing pump trucks;
the plurality of liquid carbon dioxide storage tanks are respectively connected with inlets of the carbon dioxide booster pumps through pipelines, outlets of the carbon dioxide booster pumps are respectively connected with inlets of the plurality of carbon dioxide fracturing pump trucks through low-pressure pipelines, and outlets of the plurality of carbon dioxide fracturing pump trucks are respectively connected with a wellhead through high-pressure pipelines;
the carbon dioxide booster pump is provided with a proportional pump which is used for pumping the thickening drag reducer in the pump injection thickening drag reducer storage tank;
the thickener sand-adding ground equipment comprises a plurality of sand-adding thickener storage tanks, sand tanks, a sand mixer truck and a plurality of fracturing pump trucks;
the sand tank is connected with an inlet of the sand mixing truck through a pipeline;
the sand-adding thickener storage tanks are connected with the inlets of the sand mixing trucks through pipelines, the outlets of the sand mixing trucks are respectively connected with the inlets of the fracturing pump trucks through low-pressure pipelines, and the outlets of the fracturing pump trucks are respectively connected with a wellhead through high-pressure pipelines.
The carbon dioxide fracturing pump truck is provided with a butyl rubber sealing element or a metal sealing element.
The interface of the high-pressure pipeline adopted in the process of pumping the liquid carbon dioxide into the ground is sealed by using sealing grease.
A safety valve and a pressure relief valve are arranged between any two valves on all carbon dioxide suction pipelines in the liquid carbon dioxide pump injection ground equipment.
Example 2
The invention provides a supercritical carbon dioxide non-closed sand fracturing method for an oil and gas well, which comprises six steps of fracturing equipment material preparation, ground equipment connection, ground high-pressure pipeline pressure test, pump injection construction, pump stop and well shut-in, and control of back-discharge and blowout test gas (as shown in figure 3). Wherein:
(1) preparing fracturing equipment materials: preparing equipment and chemical materials used for construction according to a design, conveying the equipment and the chemical materials to a well site and placing the equipment and the chemical materials according to the design; checking the fracturing equipment, if the equipment has a fault hidden trouble, timely repairing or replacing the equipment, checking the performance of the chemical material for fracturing, if the performance does not meet the design requirement, timely adjusting or replacing the equipment, and entering the next step of the process after the equipment material passes the checking;
(2) ground pipeline and equipment connection: connecting the fracturing equipment with the ground high-low pressure pipeline according to the figure 4, checking whether the connection mode is correct and whether the interface is tight, sealing the interface in the process of the ground pipeline through which the liquid carbon dioxide passes by using sealing grease to prevent the liquid carbon dioxide from leaking in the construction process, and entering the next step of the process after the ground pipeline and the equipment are connected and confirmed to be correct;
(3) testing the pressure of the ground high-pressure pipeline: carrying out pressure testing on the ground high-pressure pipeline, if the pressure testing meets the standard, entering the next step of the process, otherwise, modifying or replacing the ground high-pressure pipeline, and carrying out pressure testing again until the pressure testing meets the standard;
(4) and (3) pump injection construction: pumping according to a pumping program, monitoring dynamic construction parameters in real time, detecting the performances of a carbon dioxide thickening drag reducer and a sand-adding thickener at random, ensuring that the fracturing pumping construction is safely and smoothly carried out, and immediately stopping the construction for treatment if ground pipeline puncture, sand blockage and other conditions occur in the construction process;
(5) stopping the pump and shutting down the well: after the pumping execution is finished, stopping the pump and closing the well for 5-7 days, and fully diffusing the underground supercritical carbon dioxide underground;
(6) controlling the back discharge and spraying test gas: the method comprises the steps of disassembling a fracturing ground pipeline, removing fracturing equipment, disassembling a fracturing wellhead, replacing a gas production tree, controlling back flow after pressure through a blowout back flow system which is strictly controlled from small to large, preventing damage to a shaft or backflow of a propping agent caused by severe gasification of carbon dioxide in the back flow process, and igniting and testing gas at proper time.
The step (1) specifically includes:
101. a storage tank meeting the design requirements of liquid carbon dioxide, carbon dioxide thickening drag reducer and sand-adding thickener dosage is prepared on site, and the temperature and pressure conditions of the storage tank meet the storage requirements;
102. the fracturing pump truck in the flow of injecting the carbon dioxide pump into the ground needs to be changed into a butyl rubber or metal sealing element, and the water horsepower allocation needs to meet the design discharge capacity requirement;
103. the high-pressure pipeline in the ground injection flow of the carbon dioxide pump meets the requirements of pressure bearing and low temperature resistance, and the joint is sealed by sealing grease;
104. a carbon dioxide booster pump and a proportional pump are arranged in the ground injection flow of the carbon dioxide pump, so that the discharge capacity meets the design requirement;
105. the low-pressure pipeline in the ground injection flow of the carbon dioxide pump meets the low-temperature resistance requirement, and the pressure bearing needs to be matched with a booster pump;
106. a safety valve and a pressure relief valve must be arranged between any two valves on all carbon dioxide suction pipelines in the carbon dioxide pumping flow.
The step (3) specifically includes:
301. in the flow of pumping the carbon dioxide to the ground, liquid carbon dioxide, liquid nitrogen or special antifreeze is used for pressure testing, and if pressure leakage is monitored in the pressure testing process, pipeline renovation or replacement is carried out;
302. and (3) carrying out pressure test by using clear water or slick water in the process of injecting the thickening agent into the ground by using a sand pump, and if pressure leakage is monitored in the pressure test process, carrying out pipeline renovation or replacement.
The step (4) specifically includes:
401. performing liquid carbon dioxide pumping according to a pumping program, monitoring the discharge capacity, the pumping pressure and the temperature in real time in the pumping process, ensuring the phase state of the liquid carbon dioxide to be continuous and stable in the pumping process, and adjusting in time if the liquid carbon dioxide is gasified;
402. in the pump injection construction process, the sand adding thickening agent is sampled and detected by a sand mixer at variable time, the detection comprises the detection of viscosity, fluidity, sand suspending capacity and the like of the sand adding thickening agent, and the risks of surface evacuation, insufficient liquid supply, insufficient sand suspending capacity and the like are avoided;
403. the discharge capacity and the pump pressure are detected in real time, the construction discharge capacity and the construction pressure are strictly controlled in the construction process, and overpressure is avoided.
The effect evaluation of the supercritical carbon dioxide non-closed sand fracturing method for the oil and gas well provided by the embodiment is as follows. .
Example 1 for the in situ application of the Process of the invention
The method provided by the invention and the system provided by the embodiment 1 are applied to the compact sandstone gas well with 5 different layers of the C low-permeability sandstone gas field for fracturing construction, and the consumption of carbon dioxide in a single well is 87.1-336.9m3The single well proppant has a scale of 5.67-54.4 tons and a main body construction displacement of 1.27-6.36m3Min, the highest wellhead pressure in the construction process is 86.20MPa, and the highest sand concentration is 480Kg/m3. Comparing the productivity effect before and after pressing, as shown in fig. 5: the yield of the single-well natural gas is improved by 4-24 times after the fracturing modification is carried out by the process method, and the yield of individual wells is increased to 100-400Mcf/d after the fracturing modification from no yield, so that the yield increasing effect is obvious.
Example 2 of the present invention Process for the in situ application
Fracturing construction is carried out on 4 tight sandstone wells in F1 layers and 2 tight sandstone wells in F2 layers in F hypotonic gas fields by applying the method provided by the invention and the system provided by the embodiment 1, and natural gas productivity of the well fractured by adopting the process method of the invention and natural gas productivity of all other wells in the same layer are compared, the average single-well productivity of other wells in the F1 layers is 3.9 × 104m3The average yield of the well fractured by the process is 7.05 × 104m3The yield increase amplitude is 80.7 percent, and the average single well productivity of other wells of F2 layers is 1.4 × 104m3The average yield of the well fractured by the process is 9.25 × 104m3And d, the yield increase amplitude is 5.6 times.
Example 3 for the in situ application of the Process of the invention
The method provided by the invention and the system provided by the embodiment 1 are applied to compact sandstone gas wells with 15 different horizons of an O gas field for fracturing construction, the well depth is 705-3The single well propping agent has a scale of 5.78-73.9 tons and a main body construction displacement of 5.30-6.40m3Min, the highest sand concentration is 300-3Comparing the productivity effect before and after fracturing, as shown in FIG. 6, the natural gas productivity of a single well after fracturing modification by the process of the present invention is averagely increased by 8 times, and the yield of individual wells after fracturing modification from no yield to 0.8 × 104-1.6×104m3And d, the yield increasing effect is obvious.
Example 4 of the field application of the Process of the invention
The method provided by the invention and the system provided by the embodiment 1 are applied to the CL tight sandstone reservoir in the A gas field for fracturing construction. The average depth of the reservoir is 2836m, the average reservoir pressure is 37MPa, and the average fracture pressure gradient is 0.0018 MPa/m. 2 wells with the same layer are selected, the traditional full-closed type well which is fractured by the supercritical carbon dioxide dry method and uses the traditional thickening agent is adopted, and 4 wells which are fractured by the process method are respectively compared with the construction parameters (figure 7) and the energy production efficiency after fracturing (figure 8).
From the construction parameter perspective: under the condition that the amount of carbon dioxide liquid for construction is equivalent (average 261.5-271.5 m)3) The construction discharge capacity of the well body which adopts the traditional totally-closed type and adopts the traditional thickening agent and is fractured by the supercritical carbon dioxide dry method can only reach 4.0m3Min, the construction discharge capacity of the well body fractured by the process method can reach 7.5-9.0m3Min; the sand adding amount of the well which adopts the traditional full-closed type and adopts the traditional thickening agent and is subjected to the supercritical carbon dioxide dry fracturing is onlyTo reach 3.2-6.2m3The sand adding amount of the well fractured by the process method can reach 14.9-30.6m3(ii) a The highest sand ratio of the well fractured by the supercritical carbon dioxide dry method adopting the traditional full-closed type and the traditional thickening agent can only reach about 10.0 percent, and the highest sand ratio of the well fractured by the process method can reach 16.0 to 24.0 percent. Therefore, the well which is subjected to supercritical carbon dioxide dry fracturing by the process method can support higher discharge capacity, sand adding amount and sand ratio in fracturing over-construction of a tight sandstone gas well due to the addition of the efficient drag reduction tackifier and the independent flow.
From the aspect of energy production effect, the natural gas yield after 2 well fracturing by adopting the conventional full-closed supercritical carbon dioxide dry fracturing with the conventional thickening agent is 3.995 × 104-4.740×104m3D, average 4.368 × 104m3The natural gas yield after 4 well fractures fractured by the process can reach 9.602 × 104-15.202×104m3D, average 11.635 × 104m3D; compared with the traditional method, the process method of the invention improves the productivity by 1.66 times.
Example 5 for the in situ application of the Process of the invention
The method provided by the invention and the system provided by the embodiment 1 are applied to the AC tight oil reservoir row in the 25 region of the EF oil field for fracturing construction. The average depth of the reservoir is 3133m, the average reservoir pressure is 40.2MPa, and the average fracture pressure gradient is 0.002 MPa/m. The method comprises the steps of selecting 3 wells with the same position in an EF oil field 38 area, fracturing by adopting a traditional fully-closed supercritical carbon dioxide dry method applying a traditional thickening agent, and comparing construction parameters (figure 9) with post-fracturing energy production efficiency (figure 10) of the 3 wells fractured by applying the process method.
From the construction parameter perspective: under the condition of equivalent construction carbon dioxide liquid amount (average 262.4-274.6 m)3) The construction discharge capacity of the well body which adopts the traditional totally-closed type and adopts the traditional thickening agent and is fractured by the supercritical carbon dioxide dry method can only reach3.0-3.5m3Min, the construction discharge capacity of the well body fractured by the process method can reach 6.0-6.5m3Min; the sand adding amount of the well fractured by the supercritical carbon dioxide dry method adopting the traditional full-closed type and the traditional thickening agent can only reach 5.36-9.24m3The sand adding amount of the well fractured by the process method can reach 19.5 to 29.3m3(ii) a The highest sand ratio of the well fractured by the supercritical carbon dioxide dry method adopting the traditional full-closed type and the traditional thickening agent can only reach about 5.0 to 7.5 percent, and the highest sand ratio of the well fractured by the process method can reach 15.0 to 21.0 percent. Therefore, the well which is subjected to supercritical carbon dioxide dry fracturing by the process method can support higher discharge capacity, sand adding amount and sand ratio in the fracturing construction of a compact oil well due to the addition of the efficient drag reduction tackifier and the independent flow.
From the perspective of productivity effect: the traditional full-closed type supercritical carbon dioxide dry fracturing 3 wells by using the traditional thickening agent is adopted, the yield of the crude oil after fracturing is 5.889-16.321 tons/day, and the average yield is 10.616 tons/day; the yield of 3 wells fractured by the process method can reach 22.983-37.291 tons/day after fracturing, and the average yield is 31.812 tons/day; compared with the traditional method, the process method of the invention improves the productivity by about 2 times.
Example 6 for the in situ application of the Process of the invention
The method provided by the invention and the system provided by the embodiment 1 are applied to the LM shale gas reservoir in the WY-2 area of the SC gas field for fracturing construction. The average depth of the reservoir is 3300m, the average reservoir pressure is 56.7MPa, and the average formation temperature exceeds 100 ℃. Selecting 4 horizontal wells with the same position of an FL gas field, fracturing by a supercritical carbon dioxide dry method in a traditional fully-closed manner by using a traditional thickening agent (the average depth of a reservoir is 2780m, the average pressure of the reservoir is 39.8MPa, the average formation temperature is 99 ℃, and the porosity, the natural fracture development degree and the gas abundance are all better than those of the reservoir with the same position of an SC gas field WY-2 region), and 4 horizontal wells fracturing by using the process method, and respectively comparing the construction parameters (figure 11) with the post-fracturing energy production efficiency effect (figure 12).
From the construction parameter perspective: under the condition that the carbon dioxide construction fluid volume of a single well (sections 19-22) is equivalent (the single well fluid volume is 3586.1-4033.9 m)3The average liquid amount of the single section is 183.9-192.1m3) The construction discharge capacity of the main body of the 4-mouth shale gas horizontal well which adopts the traditional full-closed type and adopts the supercritical carbon dioxide dry fracturing of the traditional thickening agent can only reach 2.8-4.0m3Min, average 3.0m3The sand adding amount of a single well can only reach 78.3-126.0m3Average of 98.5m3The sand adding amount of a single section is 3.6-6.0m3Average of 4.7m3The highest construction sand ratio is 7.0-10.5%; the construction discharge capacity of the main body of the 4-mouth shale gas horizontal well fractured by the process method can reach 6.2-6.5m3Min, average 6.3m3Min, the sand adding amount of a single well can reach 370.0-522.5m3Average of 433.2m3The sand adding amount of a single section is 18.5-27.5m3Average of 22.3m3The highest construction sand ratio is 18.0-24.0%. Therefore, the shale gas well which is subjected to supercritical carbon dioxide dry fracturing by the process method has higher supportable construction discharge capacity, larger whole well/single section sand adding amount and higher supportable sand ratio due to the addition of the efficient anti-drag tackifier and the independent flow.
From the aspect of energy production effect, the natural gas energy after fracturing is 4.652 × 10 by adopting a traditional totally-closed type supercritical carbon dioxide dry fracturing 4 shale gas wells applying a traditional thickening agent4-8.738×104m3D, average 6.381 × 104m3And the post-fracturing yield of the 4 shale gas wells fractured by the process can reach 10.324 × 104-18.723×104m3D, average 14.396 × 104m3D; compared with the traditional method, the process method of the invention improves the productivity by 1.26 times.
Claims (10)
1. A supercritical carbon dioxide non-closed sand fracturing method for an oil-gas well is characterized by comprising a liquid carbon dioxide pump injection ground flow, a thickener sand adding ground flow and sand fracturing operation after well entering and mixing which are mutually independent; wherein,
the process of pumping the liquid carbon dioxide into the ground comprises the following specific operations:
pressurizing liquid carbon dioxide by a carbon dioxide booster pump, inputting the liquid carbon dioxide into a carbon dioxide fracturing pump truck through a low-pressure pipeline, and pumping the liquid carbon dioxide into a well through a high-pressure pipeline; meanwhile, in the process of injecting liquid carbon dioxide by a pump, a proportional pump is arranged on a carbon dioxide booster pump to pump and inject a thickening drag reducer according to a designed proportion, and the thickening drag reducer is ensured to be uniformly dissolved with the liquid carbon dioxide before entering a carbon dioxide fracturing pump;
the ground flow of the thickening agent for adding sand comprises the following specific operations:
mixing a sand-adding thickening agent and fracturing sand in a sand mixing truck, inputting the mixture into a fracturing pump truck through a low-pressure pipeline, and pumping the obtained mixture into a well through a high-pressure pipeline;
the liquid carbon dioxide pump injection ground flow and the thickener sand adding ground flow are respectively pumped into the well, and the fluids are mixed to carry out sand adding fracturing operation.
2. The supercritical carbon dioxide non-closed sand fracturing method for oil and gas wells according to claim 1, wherein the carbon dioxide fracturing pump truck is a carbon dioxide fracturing pump truck equipped with a butyl rubber seal or a metal seal.
3. The oil and gas well supercritical carbon dioxide non-closed sand fracturing method according to claim 1, characterized in that the interface of the high pressure pipeline adopted in the liquid carbon dioxide pumping ground flow is sealed by using sealing grease.
4. The oil and gas well supercritical carbon dioxide non-closed sand fracturing method according to claim 1, wherein the discharge capacity, the pump pressure and the temperature need to be monitored in real time in the liquid carbon dioxide pump injection ground flow to ensure the continuous and stable phase state of the liquid carbon dioxide in the pumping process and avoid the gasification of the liquid carbon dioxide.
5. The oil and gas well supercritical carbon dioxide non-closed sand fracturing method according to claim 1, characterized in that the sand thickening agent needs to be sampled and detected by a sand mixer truck at variable time in the surface flow of the thickening agent sand adding so as to avoid the risks of surface evacuation, insufficient liquid supply and insufficient sand suspending capacity in the fracturing construction process.
6. The oil and gas well supercritical carbon dioxide non-closed sand fracturing method as claimed in claim 5, wherein the sampling test comprises the test of viscosity, fluidity and sand suspending ability of the sand-adding thickener.
7. A supercritical carbon dioxide non-closed sand fracturing system for an oil and gas well is characterized by comprising liquid carbon dioxide pump injection ground equipment and thickener sand adding ground equipment which are mutually independent;
the liquid carbon dioxide pumping ground equipment comprises a plurality of liquid carbon dioxide storage tanks, a thickening drag reducer storage tank, a carbon dioxide booster pump and a plurality of carbon dioxide fracturing pump trucks;
the plurality of liquid carbon dioxide storage tanks are respectively connected with inlets of the carbon dioxide booster pumps through pipelines, outlets of the carbon dioxide booster pumps are respectively connected with inlets of the plurality of carbon dioxide fracturing pump trucks through low-pressure pipelines, and outlets of the plurality of carbon dioxide fracturing pump trucks are respectively connected with a wellhead through high-pressure pipelines;
the carbon dioxide booster pump is provided with a proportional pump which is used for pumping the thickening drag reducer in the pump injection thickening drag reducer storage tank;
the thickener sand-adding ground equipment comprises a plurality of sand-adding thickener storage tanks, sand tanks, a sand mixer truck and a plurality of fracturing pump trucks;
the sand tank is connected with an inlet of the sand mixing truck through a pipeline;
the sand adding thickener storage tanks are connected with the inlets of the sand mixing trucks through pipelines, the openings of the sand mixing trucks are respectively connected with the inlets of the fracturing pump trucks through low-pressure pipelines, and the outlets of the fracturing pump trucks are respectively connected with the well mouths through high-pressure pipelines.
8. The oil and gas well supercritical carbon dioxide non-closed sanding fracturing system of claim 7 wherein the carbon dioxide fracturing pump truck is a carbon dioxide fracturing pump truck equipped with butyl rubber seals or metal seals.
9. The oil and gas well supercritical carbon dioxide non-closed sand fracturing system of claim 7, wherein the interface of the high pressure pipeline used in the liquid carbon dioxide pumping ground flow path is sealed with a sealing grease.
10. The supercritical carbon dioxide non-closed sand fracturing system for oil and gas wells as claimed in claim 7, wherein a safety valve and a pressure relief valve are installed between any two valves on all carbon dioxide suction pipelines in the liquid carbon dioxide pumping ground equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016720.2A CN106401554A (en) | 2016-11-18 | 2016-11-18 | Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016720.2A CN106401554A (en) | 2016-11-18 | 2016-11-18 | Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106401554A true CN106401554A (en) | 2017-02-15 |
Family
ID=58068972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611016720.2A Pending CN106401554A (en) | 2016-11-18 | 2016-11-18 | Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106401554A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009670A (en) * | 2017-11-21 | 2018-05-08 | 东方宝麟科技发展(北京)有限公司 | A kind of optimum design method for improving supercritical carbon dioxide dry method fracturing effect |
| CN108049858A (en) * | 2017-12-12 | 2018-05-18 | 北京百利时能源技术股份有限公司 | The fine and close compound sand fracturing method of the preposition accumulation of energy of oil well carbon dioxide |
| CN108825194A (en) * | 2018-04-17 | 2018-11-16 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous sand adding fracturing method |
| CN108868730A (en) * | 2018-06-20 | 2018-11-23 | 西南石油大学 | Supercritical carbon dioxide sprays pressure break phase control method, device and electronic equipment |
| CN108980621A (en) * | 2018-08-17 | 2018-12-11 | 中国石油大学胜利学院 | For shortening the polymer drag reducer swelling treatment method of drag reducer onset time |
| CN109736767A (en) * | 2019-01-18 | 2019-05-10 | 大庆中联信实石油科技开发有限公司 | A kind of supercritical carbon dioxide fracturing yield increasing technique |
| CN110500080A (en) * | 2019-09-20 | 2019-11-26 | 四川洁能锐思石油技术有限公司 | A kind of high permeability zone bottom water coning shuts down stifled dredge of well and adopts control comprehensive processing method |
| CN110735622A (en) * | 2019-11-27 | 2020-01-31 | 太原理工大学 | kinds of supercritical CO2Method and device for exploiting coal bed gas by water-combined fracturing |
| CN112796727A (en) * | 2021-02-26 | 2021-05-14 | 中国地质调查局油气资源调查中心 | Composite volume fracturing system and method for continental facies shale reservoir |
| CN112901132A (en) * | 2019-11-19 | 2021-06-04 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous fracturing system and method |
| CN113187459A (en) * | 2021-06-03 | 2021-07-30 | 新疆恒洲景业石油技术服务有限公司 | Carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir transformation |
| CN114033347A (en) * | 2021-11-10 | 2022-02-11 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas fracturing system and method |
| CN114233260A (en) * | 2021-12-21 | 2022-03-25 | 中石化石油工程技术服务有限公司 | Shale gas fracturing double-pump-in low-pressure liquid supply device |
| CN114517671A (en) * | 2021-12-27 | 2022-05-20 | 天地科技股份有限公司 | Carbon dioxide pumping system for underground coal mine |
| CN116771315A (en) * | 2023-07-31 | 2023-09-19 | 中国石油大学(北京) | Quasi-dry carbon dioxide fracturing method and carbon dioxide fracturing device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150060044A1 (en) * | 2013-08-30 | 2015-03-05 | William Scharmach | Control system and apparatus for delivery of a non-aqueous fracturing fluid |
| CN104675374A (en) * | 2013-11-29 | 2015-06-03 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Unconventional CO2 fracturing site operation technology |
| CN104937211A (en) * | 2012-11-30 | 2015-09-23 | 通用电气公司 | Co2 fracturing system and method of use |
| CN105545273A (en) * | 2016-01-23 | 2016-05-04 | 吉林大学 | Device and method for exploiting terrestrial natural gas hydrates through CO2 fracturing and displacing |
| CN105649595A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Air cushion type filtration reducing and drainage assisting method for repeated transformation of old well of low-pressure gas field |
| CN105863597A (en) * | 2016-05-27 | 2016-08-17 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | High pressure manifold device for carbon dioxide dry fracturing |
| CN105952428A (en) * | 2016-05-06 | 2016-09-21 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fiber-assisted carbon-dioxide dry-flacturing method |
-
2016
- 2016-11-18 CN CN201611016720.2A patent/CN106401554A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104937211A (en) * | 2012-11-30 | 2015-09-23 | 通用电气公司 | Co2 fracturing system and method of use |
| US20150060044A1 (en) * | 2013-08-30 | 2015-03-05 | William Scharmach | Control system and apparatus for delivery of a non-aqueous fracturing fluid |
| CN104675374A (en) * | 2013-11-29 | 2015-06-03 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Unconventional CO2 fracturing site operation technology |
| CN105649595A (en) * | 2015-12-31 | 2016-06-08 | 中国石油天然气股份有限公司 | Air cushion type filtration reducing and drainage assisting method for repeated transformation of old well of low-pressure gas field |
| CN105545273A (en) * | 2016-01-23 | 2016-05-04 | 吉林大学 | Device and method for exploiting terrestrial natural gas hydrates through CO2 fracturing and displacing |
| CN105952428A (en) * | 2016-05-06 | 2016-09-21 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Fiber-assisted carbon-dioxide dry-flacturing method |
| CN105863597A (en) * | 2016-05-27 | 2016-08-17 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | High pressure manifold device for carbon dioxide dry fracturing |
Non-Patent Citations (1)
| Title |
|---|
| 付美龙: "《油田化学原理》", 31 August 2015, 石油工业出版社 * |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009670A (en) * | 2017-11-21 | 2018-05-08 | 东方宝麟科技发展(北京)有限公司 | A kind of optimum design method for improving supercritical carbon dioxide dry method fracturing effect |
| CN108009670B (en) * | 2017-11-21 | 2020-11-20 | 东方宝麟科技发展(北京)有限公司 | Optimization design method for improving supercritical carbon dioxide dry fracturing effect |
| CN108049858A (en) * | 2017-12-12 | 2018-05-18 | 北京百利时能源技术股份有限公司 | The fine and close compound sand fracturing method of the preposition accumulation of energy of oil well carbon dioxide |
| CN108825194B (en) * | 2018-04-17 | 2020-08-07 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous sand adding fracturing method |
| CN108825194A (en) * | 2018-04-17 | 2018-11-16 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous sand adding fracturing method |
| CN108868730A (en) * | 2018-06-20 | 2018-11-23 | 西南石油大学 | Supercritical carbon dioxide sprays pressure break phase control method, device and electronic equipment |
| CN108868730B (en) * | 2018-06-20 | 2021-08-06 | 西南石油大学 | Supercritical carbon dioxide jet fracturing phase state control method and device and electronic equipment |
| CN108980621A (en) * | 2018-08-17 | 2018-12-11 | 中国石油大学胜利学院 | For shortening the polymer drag reducer swelling treatment method of drag reducer onset time |
| CN109736767A (en) * | 2019-01-18 | 2019-05-10 | 大庆中联信实石油科技开发有限公司 | A kind of supercritical carbon dioxide fracturing yield increasing technique |
| CN110500080A (en) * | 2019-09-20 | 2019-11-26 | 四川洁能锐思石油技术有限公司 | A kind of high permeability zone bottom water coning shuts down stifled dredge of well and adopts control comprehensive processing method |
| CN110500080B (en) * | 2019-09-20 | 2021-09-07 | 四川洁能锐思石油技术有限公司 | High-permeability bottoming water coning shut-in well plugging dredging production control comprehensive treatment method |
| CN112901132A (en) * | 2019-11-19 | 2021-06-04 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous fracturing system and method |
| CN110735622A (en) * | 2019-11-27 | 2020-01-31 | 太原理工大学 | kinds of supercritical CO2Method and device for exploiting coal bed gas by water-combined fracturing |
| CN112796727A (en) * | 2021-02-26 | 2021-05-14 | 中国地质调查局油气资源调查中心 | Composite volume fracturing system and method for continental facies shale reservoir |
| CN113187459A (en) * | 2021-06-03 | 2021-07-30 | 新疆恒洲景业石油技术服务有限公司 | Carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir transformation |
| CN114033347A (en) * | 2021-11-10 | 2022-02-11 | 北京奥瑞安能源技术开发有限公司 | Coal bed gas fracturing system and method |
| CN114233260A (en) * | 2021-12-21 | 2022-03-25 | 中石化石油工程技术服务有限公司 | Shale gas fracturing double-pump-in low-pressure liquid supply device |
| CN114517671A (en) * | 2021-12-27 | 2022-05-20 | 天地科技股份有限公司 | Carbon dioxide pumping system for underground coal mine |
| CN116771315A (en) * | 2023-07-31 | 2023-09-19 | 中国石油大学(北京) | Quasi-dry carbon dioxide fracturing method and carbon dioxide fracturing device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106401554A (en) | Oil and gas well supercritical carbon dioxide non-closed sand fracturing system and method | |
| CN109736767B (en) | Supercritical carbon dioxide fracturing production increasing process | |
| CN102168545B (en) | Coiled tubing supercritical CO2 jet fracturing method | |
| AU2014336858B2 (en) | Method for enhanced fuel gas extraction by coal mine underground gas-liquid dual-phase alternating phase-driven fracturing of coal body | |
| WO2017028559A1 (en) | Permeable cement stone fracturing exploitationmethod forunconventional oil and gas layer | |
| CN109707360B (en) | A kind of compound fracturing method of high pressure nitrogen-low temperature liquid nitrogen for frscturing | |
| CN101575983A (en) | Directional fracturing permeability improvement outburst elimination method in coal mine and device thereof. | |
| CN103590801A (en) | Coal bed methane horizontal well nitrogen foam fracturing mining technology | |
| CN111119828B (en) | Method for fracturing coal bed gas reservoir by using nitrogen foam fracturing fluid | |
| CN113027407B (en) | Foam-gas composite staged fracturing method for stratum | |
| CN112746833B (en) | Low-permeability reservoir chemical agent and carbon dioxide composite miscible fracturing method | |
| CN113187459B (en) | Carbon dioxide acid fracturing method for ultra-deep well carbonate rock reservoir transformation | |
| WO2020151207A1 (en) | Coordinative extraction and pressure relief method for high confined water high gas coal seam group | |
| US20160102538A1 (en) | Three-phase method for injecting carbon dioxide into oil reservoirs | |
| CA2921464A1 (en) | Well operations | |
| CN106321046A (en) | Hydraulic sand fracturing gas extraction method for underground coal seam with low air permeability | |
| CN112412418A (en) | Freezing fracturing synergistic hydraulic punching permeability-increasing pumping-promoting method for low-permeability coal seam | |
| CN112412422A (en) | Freezing fracturing cooperated coal seam hydraulic cavitation permeability increasing and pumping promoting method | |
| US9784080B2 (en) | Tubless proppant blending system for high and low pressure blending | |
| CN103470233B (en) | Heavy oil reservoir natural gas huff-puff oil production process system and oil production method | |
| CN107558950A (en) | Orientation blocking method for the closing of oil shale underground in situ production zone | |
| CN104612648A (en) | Method and device for active water-nitrogen foam fracturing of low-pressure and low permeability coal bed gas well | |
| CN107461182A (en) | Layered fracturing sand prevention method | |
| CN113356820A (en) | Fracturing method | |
| WO2019205517A1 (en) | Coalbed methane horizontal well hole collapse cave-building pressure relief developing system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170215 |
|
| RJ01 | Rejection of invention patent application after publication |