CN113494272A - Composite blockage removing method and device for high-pressure gas well - Google Patents
Composite blockage removing method and device for high-pressure gas well Download PDFInfo
- Publication number
- CN113494272A CN113494272A CN202010192885.5A CN202010192885A CN113494272A CN 113494272 A CN113494272 A CN 113494272A CN 202010192885 A CN202010192885 A CN 202010192885A CN 113494272 A CN113494272 A CN 113494272A
- Authority
- CN
- China
- Prior art keywords
- dosage
- liquid
- determining
- blockage
- fluid
- 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
- 239000002131 composite material Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 239000002253 acid Substances 0.000 claims abstract description 75
- 239000010426 asphalt Substances 0.000 claims abstract description 72
- 239000002270 dispersing agent Substances 0.000 claims abstract description 70
- 239000012188 paraffin wax Substances 0.000 claims abstract description 68
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 66
- 230000002265 prevention Effects 0.000 claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims description 104
- 238000002347 injection Methods 0.000 claims description 70
- 239000007924 injection Substances 0.000 claims description 70
- 238000006073 displacement reaction Methods 0.000 claims description 40
- 239000000203 mixture Substances 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 230000005764 inhibitory process Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 239000001993 wax Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 9
- 238000000926 separation method Methods 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000003381 stabilizer Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000020477 pH reduction Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000004451 qualitative analysis Methods 0.000 description 4
- 238000004445 quantitative analysis Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000002579 anti-swelling effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Images
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
- 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 or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides a composite blockage removing method and a composite blockage removing device for a high-pressure gas well, wherein the blockage removing method comprises the following steps: determining the components of a clear paraffin inhibitor, an asphalt dispersant and an acid liquor in the plugging removing liquid according to the blockage of the shaft; according to the plugging position and the shaft parameters, determining the dosage of the paraffin removal and prevention agent in the plugging removal liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage; and injecting the third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft. The blockage removing method can carry out composite blockage removal through the low-liquid-volume asphalt dispersant, the paraffin removal and prevention agent and the acid liquor in the blockage process of the high-pressure gas well, so that the normal production performance of the high-pressure gas well is recovered.
Description
Technical Field
The invention relates to a blockage removing method, in particular to a composite blockage removing method and device for a high-pressure gas well, and belongs to the technical field of petroleum and natural gas yield increase.
Background
The problem of blockage of the high-pressure gas well shaft in China is increasingly prominent, and the natural gas yield is seriously influenced. The high-pressure gas well shaft blockage has various forming conditions and complex blockage components, and at present, acidification is one of main measures for removing sand blockage or scale blockage of the shaft and recovering the gas well capacity, but the acidification has poor blockage removing effect on organic blockages such as wax, asphaltene and the like. Under the background of stable production and yield improvement of the existing oil and gas field, a composite blockage removal technology of a high-pressure gas well is urgently needed, and provides a powerful guarantee for the production of the gas well.
The deblocking technology adopted at the present stage is mainly a composite deblocking technology, that is, a plurality of measures are adopted to jointly deblock, such as composite deblocking processes of ' microorganism + acid liquid ', coiled tubing + foamed acid ' and the like, and other well bore deblocking patent technologies. The patent application of CN201810849946.3 provides a composite blockage removing method for a coiled tubing of a horizontal well, which adopts a composite blockage removing technology that the impact force of the rotary jet of the coiled tubing is adopted to break the blockage of a shaft, and then the blockage of a zone close to the well is dissolved by using foamed acid.
However, the existing composite blockage removal technology mainly focuses on the formula of a blockage removal agent or the blockage removal of a conventional shaft, and cannot be applied to a high-pressure gas well, and an effective blockage removal effect cannot be simultaneously generated on organic and inorganic blockages.
Disclosure of Invention
The invention provides a composite blockage removing method for a high-pressure gas well, which can carry out composite blockage removal through a low-liquid-volume asphalt dispersant, a paraffin removal and prevention agent and an acid solution in the blockage removing process of the high-pressure gas well, so that the normal production capacity of the high-pressure gas well is recovered.
The invention also provides a composite blockage removing device for the high-pressure gas well, which can help realize composite blockage removal through the low-liquid-volume asphalt dispersant, the paraffin removal and prevention agent and the acid liquor in the blockage process of the high-pressure gas well, so that the capacity of the high-pressure gas well is recovered to be normal.
The invention provides a composite blockage removing method for a high-pressure gas well, which comprises the following steps:
determining the components of a clear paraffin inhibitor, an asphalt dispersant and an acid liquor in the plugging removing liquid according to the blockage of the shaft;
according to the plugging position and the shaft parameters, determining the dosage of the paraffin removal and prevention agent in the plugging removal liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage;
and injecting the third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft.
The composite blockage relieving method for the high-pressure gas well further comprises the following steps:
determining the composition of a pad fluid, a post fluid and a displacement fluid in the blockage removing fluid according to the wellbore blockage;
and determining the usage amount of the front liquid in the plugging removal liquid as a fourth usage amount, determining the usage amount of the back liquid as a fifth usage amount, and determining the usage amount of the displacement liquid as a sixth usage amount according to the wellbore parameters.
The composite unblocking method for the high-pressure gas well, wherein the injecting the third amount of acid solution after the injecting the first amount of paraffin removal and prevention agent and the second amount of asphalt dispersant into the wellbore, comprises:
injecting a portion of the pad fluid in the fourth volume to determine an injection pressure of the deblocking fluid;
injecting the first amount of paraffin removal and inhibition agent and the second amount of asphalt dispersant into the well bore according to the injection pressure;
injecting a portion of the fifth volume of the post fluid into the wellbore in accordance with the injection pressure;
injecting a remaining portion of the pad fluid into the wellbore in accordance with the injection pressure;
injecting the third amount of acid solution into the wellbore according to the injection pressure;
injecting a remaining portion of the post fluid into the wellbore in accordance with the injection pressure;
injecting the sixth amount of displacement fluid into the wellbore in accordance with the injection pressure.
The composite plugging removal method for the high-pressure gas well, wherein the step of injecting a part of the fourth dosage of the pad fluid to determine the injection pressure of the plugging removal fluid, comprises the following steps:
if the oil pipe is communicated with the casing, the injection pressure is not higher than the first annular pressure of the oil pipe and the casing;
otherwise, determining the injection pressure according to the smaller value of 80% of the external extrusion resistance strength of the inner-layer sleeve, 80% of the minimum internal pressure resistance strength of the outer-layer sleeve, 80% of the strength of the four-way lower flange of the pipe sleeve head and the pressure test value.
The composite blockage relieving method for the high-pressure gas well further comprises closing the well after the blockage relieving liquid is injected.
The composite blocking removal method for the high-pressure gas well, wherein the wellbore parameters comprise the inner volume of a tubing string, the stratum parameters of a production interval and the blocking removal radius.
The invention also provides a device for carrying out the composite blockage relieving method for the high-pressure gas well, which comprises the following steps:
the analysis unit is used for determining the composition of a clear paraffin inhibitor, an asphalt dispersant and an acid solution in the plugging removing liquid according to the blockage of the shaft;
the system is also used for determining the dosage of the paraffin removal and prevention agent in the blockage removing liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage according to the blockage position and the shaft parameters;
and the injection unit is used for injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft and then injecting the third dosage of acid liquor.
The device as described above, wherein the analysis unit is further configured to determine the composition of a pad fluid, a post fluid and a displacement fluid in the de-plugging fluid according to the wellbore blockage;
and the system is also used for determining the dosage of the front liquid in the plugging removal liquid as a fourth dosage, determining the dosage of the back liquid as a fifth dosage and determining the dosage of the displacement liquid as a sixth dosage according to the wellbore parameters.
The device comprises an injection unit, a pressure control unit and a control unit, wherein the injection unit comprises an acidizing and fracturing pump truck, an asphalt dispersant tank truck, a paraffin removal and control agent tank truck, an acid tank truck, a front tank truck, a rear tank truck and a displacement tank truck;
the asphalt dispersant tank truck, the paraffin removal and prevention agent tank truck, the acid liquor tank truck, the front tank truck, the rear tank truck and the displacement tank truck are respectively communicated with the acidizing and fracturing pump truck.
The device as described above, wherein a detection unit is further included;
the detection unit is used for detecting the pressure of a pump injection pipeline communicated with the acidizing and fracturing pump truck.
The invention discloses a composite blockage removing method for a high-pressure gas well, which comprises the following steps: determining the components of a clear paraffin inhibitor, an asphalt dispersant and an acid liquor in the plugging removing liquid according to the blockage of the shaft; according to the plugging position and the shaft parameters, determining the dosage of the paraffin removal and prevention agent in the plugging removal liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage; and injecting the third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft. According to the method, the components of the blockage are analyzed by sampling the blockage of the shaft, so that the formulas of a paraffin removal and prevention agent, an asphalt dispersant and an acid solution in the blockage removing liquid are determined; determining the respective use amounts of the paraffin removal and prevention agent, the asphalt dispersant and the acid liquor in the plugging removing liquid according to the plugging position and the shaft parameters; according to the principle of firstly removing the organic plug and then removing the inorganic plug, and firstly removing the wellbore plug and then removing the stratum plug, firstly, injecting the paraffin removal and prevention agent and the asphalt dispersing agent into the wellbore, and then, injecting the acid liquor, thereby completing the plug removal construction of the high-pressure gas well.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of a composite unblocking method for a high-pressure gas well according to the present invention;
FIG. 2 is a flow chart of yet another embodiment of the composite unblocking method for a high-pressure gas well according to the present invention;
FIG. 3 is a flow chart of yet another embodiment of the composite unblocking method for a high-pressure gas well according to the present invention;
FIG. 4 is a flow chart of yet another embodiment of the composite unblocking method for a high-pressure gas well according to the present invention;
FIG. 5 is a schematic structural diagram of an embodiment of the composite blockage relieving device for the high-pressure gas well according to the invention;
fig. 6 is a schematic diagram of an injection unit in the composite blockage relieving device for the high-pressure gas well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The high-pressure gas well in the invention refers to a gas well with the wellhead pressure of more than 70MPa and the bottom hole pressure of more than 105 MPa.
Fig. 1 is a flowchart of an embodiment of the composite blockage relieving method for the high-pressure gas well, and as shown in fig. 1, the composite blockage relieving method for the high-pressure gas well of the embodiment includes the following steps:
s101: and determining the compositions of the clear paraffin inhibitor, the asphalt dispersant and the acid liquor in the plugging removing liquid according to the blockage of the shaft.
Wellbore plugs typically include long-term formation of sand scale in the well, as well as other organic constituents.
The plugging removal liquid comprises a paraffin removal and prevention agent, an asphalt dispersant and an acid liquid, but is not a mixture of the paraffin removal and prevention agent, the asphalt dispersant and the acid liquid.
In S101, qualitative and quantitative analysis can be performed on the wellbore blockage to determine the composition of the wellbore blockage, so that the respective compositions of the paraffin removal and prevention agent, the asphalt dispersant and the acid liquor in the plugging removal liquid can be determined according to the composition of the wellbore blockage. For example, the proper types of wax removing and preventing agent and asphalt dispersing agent can be selected from a plurality of wax removing and preventing agents and asphalt dispersing agents on the market according to the qualitative and quantitative analysis of the organic matters in the shaft blockage, and the proper acid liquor can be prepared according to the qualitative and quantitative analysis of the inorganic matters in the shaft blockage.
In particular, the method of analyzing wellbore obstructions may be an analytical detection means commonly used in the art.
S102: according to the plugging position and the shaft parameters, determining the dosage of the paraffin removal and prevention agent in the plugging removing liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage.
Specifically, the dosage of the paraffin removal and prevention agent and the asphalt dispersing agent in the plugging removal liquid can be determined according to the plugging position, and the dosage of the acid liquid in the plugging removal liquid can be determined according to the shaft parameters.
The dosage of the paraffin removal and prevention agent and the asphalt dispersing agent must be capable of being soaked to the blocking position, thereby being beneficial to grading organic matters in a shaft blocking object and removing wax blocking;
the wellbore parameters comprise the inner volume of a tubing string, stratum parameters of an operation interval and the plugging removal radius, and the using amount of acid liquor can be determined according to the wellbore parameters, so that inorganic matters in wellbore plugs can be effectively decomposed.
Through S101 and S102, the composition of the deblocking liquid can be effectively qualitative and quantitative, wherein S101 is used for determining respective formulas of the clear paraffin inhibitor, the asphalt dispersant and the acid liquid in the deblocking liquid, and S102 is used for determining respective dosages of the clear paraffin inhibitor, the asphalt dispersant and the acid liquid in the deblocking liquid, and specifically, the required dosage of the clear paraffin inhibitor is determined to be a first dosage, the required dosage of the asphalt dispersant is determined to be a second dosage, and the required dosage of the acid liquid is determined to be a third dosage in S102.
S103: and injecting a third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft.
After the composition of the plugging removal liquid is qualitative and quantitative, a first dosage of paraffin removal and prevention agent and a second dosage of asphalt dispersing agent are injected into the shaft through the conveying pipeline, so that organic matters such as wax, asphalt and the like in the shaft plug are decomposed, and then a third dosage of acid liquid is injected into the shaft through the conveying pipeline, so that the inorganic matters in the shaft plug are further decomposed.
According to the invention, the shaft plug is decomposed step by step according to the steps of firstly decomposing the organic plug and then decomposing the inorganic plug, so that the high efficiency of the high-pressure gas well plugging removal construction is ensured.
According to the composite blockage removing method for the high-pressure gas well, the shaft blockage is taken as a reference, the shaft blockage is analyzed, the specific components of the shaft blockage and the content of each component can be determined, so that the blockage removing formula and the blockage removing amount of wax, asphalt and inorganic matters for removing the shaft blockage can be selected more accurately according to the shaft blockage, the effective blockage removing capability of the blockage removing liquid on the shaft blockage can be guaranteed, incomplete blockage removal caused by low consumption of the blockage removing liquid can be avoided, and the problems of overhigh blockage removing cost, stratum pollution and the like caused by overhigh consumption of the blockage removing liquid can be avoided.
In addition, according to the composite unblocking method for the high-pressure gas well in the embodiment, the effective decomposition of the wellbore blockage can be ensured by using the composite organic unblocking liquid (paraffin removal and prevention agent and asphalt dispersant) and the inorganic unblocking liquid (acid liquid), and the wellbore blockage can be efficiently decomposed through the steps of firstly unblocking the organic blockage and then unblocking the inorganic blockage, firstly unblocking the wellbore blockage and then unblocking the formation blockage.
Fig. 2 is a flowchart of another embodiment of the composite blockage relieving method for the high-pressure gas well, as shown in fig. 2, the composite blockage relieving method for the high-pressure gas well of the embodiment further includes, before S101 in fig. 1, the following steps:
s104: wellbore plugs are obtained.
In S104, the method of obtaining wellbore plugs may be a method existing in the art.
In this embodiment, the specific implementation method of S101-S103 is the same as the foregoing description of fig. 1, and is not described herein again.
Fig. 3 is a flowchart of another embodiment of the composite blockage relieving method for the high-pressure gas well, as shown in fig. 3, the composite blockage relieving method for the high-pressure gas well of the embodiment further includes the following steps based on the embodiment shown in fig. 1:
s105: and determining the compositions of the pad fluid, the post fluid and the displacement fluid in the blockage removing fluid according to the blockage of the shaft.
It can be understood that in order to ensure the efficient proceeding of the blockage removing construction, the blockage removing liquid comprises a prepositive liquid, a postpositive liquid and a displacing liquid besides the paraffin removal and prevention agent, the asphalt dispersing agent and the acid liquid.
Similarly, in this embodiment, the plugging removal liquid is not a mixture of the paraffin removal and prevention agent, the asphalt dispersant, the acid liquid, the pad fluid, the post fluid and the displacement fluid, but the paraffin removal and prevention agent, the asphalt dispersant, the acid liquid, the pad fluid, the post fluid and the displacement fluid are respectively injected at different times during the plugging removal process to compositely complete the plugging removal of the wellbore plugging.
In S105, qualitative and quantitative analysis may be performed on the wellbore plugs to determine the composition of the wellbore plugs, so that the respective compositions of the pad fluid, the post fluid, and the displacement fluid in the deblocking fluid may be determined according to the composition of the wellbore plugs, thereby completing preparation of the pad fluid, the post fluid, and the displacement fluid that are matched with the wellbore plugs.
Specifically, after the wellbore blockage is analyzed, the compositions of the paraffin removal and prevention agent, the asphalt dispersant, the acid solution, the pad fluid, the post fluid and the displacement fluid can be determined at the same time.
S106: and determining the dosage of the pad fluid in the plugging removal fluid as a fourth dosage, determining the dosage of the pad fluid as a fifth dosage and determining the dosage of the displacement fluid as a sixth dosage according to the parameters of the shaft.
Specifically, the amounts of the pad fluid, the post fluid and the displacement fluid can be determined according to wellbore parameters such as the inner volume of a tubing string, stratum parameters of a production interval, blockage removing radius and the like.
Through S105 and S106, the composition of the deblocking liquid can be further qualitative and quantitative, wherein S105 is used for determining respective formulas of the pad fluid, the post fluid and the displacement fluid in the deblocking liquid, and S106 is used for determining the usage amounts of the pad fluid, the post fluid and the displacement fluid in the deblocking liquid, specifically, the usage amount of the pad fluid is determined to be a fourth usage amount, the usage amount of the post fluid is determined to be a fifth usage amount, and the usage amount of the displacement fluid is determined to be a sixth usage amount in S106.
According to the composite blockage removing method for the high-pressure gas well, the wellbore blockage is taken as a reference, the specific components of the wellbore blockage and the content of each component can be determined by analyzing the wellbore blockage, so that the formulas and the dosage of the front liquid, the rear liquid and the displacement liquid injected into the wellbore in the blockage removing process can be more accurately selected according to the wellbore blockage, the effective blockage removing capability of the blockage removing liquid on the wellbore blockage is further ensured, and the blockage removing efficiency is improved.
In the invention, S105 and S106 are after S101, but the sequence of S105 and S106 relative to S102 and S103 is not limited, and S102 and S103 can be performed first, and then S105 and S106 can be performed; or S105 and S106 can be carried out first, and then S102 and S103 can be carried out; s102 and S105 may be performed simultaneously, and then S103 and S106 may be performed simultaneously. For example, in the embodiment shown in fig. 3, after S101, S102 and S103 are performed first, and then S105 and S106 are performed.
Fig. 4 is a flowchart of another embodiment of the composite blockage relieving method for the high-pressure gas well, as shown in fig. 4, in the composite blockage relieving method for the high-pressure gas well of the embodiment, based on the embodiment shown in fig. 2, S103 specifically includes:
s201: and injecting a part of the pad fluid in the fourth dosage to determine the injection pressure of the deblocking fluid.
The injection pressure for injecting the deblocking fluid into the wellbore may be determined by a portion of the pad fluid in the fourth quantity.
Specifically, when a part of the pad fluid in the fourth dosage is injected into the wellbore, the communication relation between the oil pipe and the casing can be judged according to the pressure of the injected pad fluid, and then the injection pressure of the deblocking fluid is determined according to the communication relation between the oil pipe and the casing. If the pressure of the injected pad fluid is continuously unchanged, the oil pipe and the casing pipe are in a non-communicating relation; if the pressure of the injected pad fluid changes, the oil pipe and the casing pipe are in a communication relationship.
If the oil pipe and the casing are communicated, the injection pressure of the plugging removing liquid is not higher than the first annular pressure of the oil pipe and the casing;
if the oil pipe and the casing pipe are in a non-communicated relation, the injection pressure of the deblocking liquid is determined according to the smaller value of 80% of the external extrusion resistance strength of the inner casing pipe, 80% of the minimum internal pressure resistance strength of the outer casing pipe, 80% of the strength of the four-way lower flange of the casing pipe head and the pressure test value.
Specifically, when the oil pipe and the casing are in a non-communicating relationship, the minimum value of the smaller value of 80% of the external extrusion resistance strength of the inner casing, 80% of the minimum internal pressure resistance strength of the outer casing, 80% of the strength of the four-way lower flange of the casing head and the pressure test value is used as the injection pressure of the unblocking liquid.
For example, if the minimum value of the smaller value of 80% of the external extrusion resistance strength of the inner-layer casing, 80% of the minimum internal pressure resistance strength of the outer-layer casing, 80% of the flange strength of the casing head under the four-way pipe joint and the pressure test value is 80% of the external extrusion resistance strength of the inner-layer casing, the injection pressure of the deblocking liquid is 80% of the external extrusion resistance strength of the inner-layer casing;
if the minimum value of the smaller value of the minimum internal pressure resistance strength of the outer-layer casing pipe, the 80% of the strength of the lower flange of the casing head four-way pipe and the pressure test value is 80% of the minimum internal pressure resistance strength of the outer-layer casing pipe, the injection pressure of the deblocking liquid is 80% of the minimum internal pressure resistance strength of the outer-layer casing pipe;
if the minimum value is the smaller value of the 80% of the strength of the four-way lower flange of the pipe sleeve head and the pressure test value, the injection pressure of the unblocking liquid is the smaller value of the 80% of the strength of the four-way lower flange of the pipe sleeve head and the pressure test value.
S202: a first amount of a paraffin control agent and a second amount of a bitumen dispersant are injected into the wellbore according to the injection pressure.
After the injection pressure of the plugging removal liquid is determined by injecting a part of pad fluid in the step S201, a first amount of paraffin removal and inhibition agent and a second amount of asphalt dispersant can be injected into the well bore according to the injection pressure.
S203: injecting a portion of the fifth volume of the post fluid into the wellbore based on the injection pressure.
After S202, a portion of the fifth volume of the post fluid may be injected into the wellbore based on the injection pressure.
S204: and injecting the rest of the pad fluid into the well bore according to the injection pressure.
After S203, the remaining portion of the pad fluid in the fourth volume may be injected into the wellbore based on the injection pressure.
S205: and injecting a third amount of acid solution into the well bore according to the injection pressure.
After S204, a third amount of acid may be injected into the wellbore based on the injection pressure.
S206: and injecting the residual part of the post fluid into the well bore according to the injection pressure.
After S205, the remaining portion of the fifth volume of the post-fluid may be injected into the wellbore based on the injection pressure.
S207: injecting a sixth amount of displacement fluid into the wellbore based on the injection pressure.
And after S207 is finished, the plugging removing liquid is injected, the well shut-in reaction time can be determined according to the actual requirements on the site, the well is shut in, and then open flow is carried out to solve the production. And (3) carrying out oil-gas-water separation treatment on the blowout product, inputting the gas phase obtained by separation into a gas collecting pipeline, inputting the oil phase obtained by separation into an oil collecting pipeline, and inputting the water phase obtained by separation into a sewage treatment device.
In the above S201 and S204, the injection speed may be 0.5 to 2m3In step S202, S203, S205 to S207,/min, the injection rate may be 0.5 to 1m3/min。
The invention also provides a composite blockage removing device for the high-pressure gas well, and the device is used for carrying out the composite blockage removing method for the high-pressure gas well.
Fig. 5 is a schematic structural diagram of an embodiment of the composite blockage relieving device for the high-pressure gas well.
As shown in fig. 5, the composite blockage relieving device for the high-pressure gas well in the embodiment includes:
the analysis unit 1 is used for determining the composition of a clear paraffin inhibitor, an asphalt dispersant and an acid solution in the plugging removing liquid according to the blockage of the shaft;
the analysis unit 1 is further used for determining the dosage of the paraffin removal and prevention agent in the plugging removal liquid as a first dosage, determining the dosage of the asphalt dispersant as a second dosage and determining the dosage of the acid liquid as a third dosage according to the plugging position and the shaft parameters;
and the injection unit 2 is used for injecting a third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft.
The apparatus of this embodiment may correspondingly execute the method embodiment shown in fig. 1, and the implementation principle and the technical effect thereof are the same, which are not described herein again.
Further, the analysis unit 2 is also used for determining the composition of the pad fluid, the post fluid and the displacement fluid in the plugging removal fluid according to the wellbore plugging;
the analysis unit 2 is further configured to determine, according to the wellbore parameter, that the amount of the pad fluid in the unblocking fluid is a fourth amount, that the amount of the pad fluid is a fifth amount, and that the amount of the displacing fluid is a sixth amount.
The apparatus of this embodiment may correspondingly execute the method embodiment shown in fig. 3, and the implementation principle and the technical effect thereof are the same, which are not described herein again.
Further, the injection unit 2 is further configured to inject a part of the pad fluid in a fourth amount, inject the first amount of the paraffin removal and inhibition agent and the second amount of the asphalt dispersant into the wellbore according to the injection pressure, inject a part of the pad fluid in a fifth amount into the wellbore according to the injection pressure, inject the remaining part of the pad fluid into the wellbore according to the injection pressure, inject the third amount of the acid fluid into the wellbore according to the injection pressure, inject the remaining part of the pad fluid into the wellbore according to the injection pressure, and inject the sixth amount of the displacement fluid into the wellbore according to the injection pressure.
The apparatus of this embodiment may correspondingly execute the method embodiment shown in fig. 4, and the implementation principle and the technical effect thereof are the same, which are not described herein again.
Further, a determination unit may be further included for determining the injection pressure of the deblocking liquid. The specific apparatus may correspond to the foregoing corresponding implementation principle and technical effect, and details are not described here.
Fig. 6 is a schematic diagram of an injection unit in the composite blockage relieving device for the high-pressure gas well.
As shown in fig. 6, the injection unit comprises an acidizing and fracturing pump truck 21, an asphalt dispersant tank truck 22, a paraffin removal and control agent tank truck 23, an acid tank truck 24, a front tank truck 25, a rear tank truck 26 and a displacement tank truck 27;
the asphalt dispersant tank truck 22, the paraffin removal and prevention agent tank truck 23, the acid liquor tank truck 24, the front tank truck 25, the rear tank truck 26 and the displacement tank truck 27 are respectively communicated with the acidizing and fracturing pump truck 21.
The acidizing and fracturing pump truck 21 is respectively communicated with the asphalt dispersant tank truck 22, the paraffin removal and prevention agent tank truck 23, the acid tank truck 24, the front tank truck 25, the rear tank truck 26 and the displacement tank truck 27 and is used for independently injecting asphalt dispersant in the asphalt dispersant tank truck 22, paraffin removal and prevention agent in the paraffin removal and prevention agent tank truck 23, acid liquor in the acid tank truck 24, front liquid in the front tank truck 25, rear liquid in the rear tank truck 26 and displacement liquid in the displacement tank truck 27 into the shaft.
The above asphaltThe capacities of the powder tank truck 22, the paraffin removal and prevention agent tank truck 23, the acid liquor tank truck 24, the front tank truck 25, the rear tank truck 26 and the displacement tank truck 27 can be independently selected from 10-100m3And the specific number of each tanker is not limited.
Still referring to fig. 6, under the action of the acidizing and fracturing pump truck 21, the asphalt dispersant, the paraffin removal inhibitor, the acid solution, the pad fluid, the post fluid and the displacement fluid respectively enter an oil pipe (S13Cr directly connected to the oil pipe/oil pipe) through an underground safety valve through a gas production tree and an oil production four-way joint on the ground and then are injected into a high-pressure gas well (the high-pressure gas well is further provided with a permanent packer, a fishing plug and a ball seat), after the injection is completed, the well is closed for a period of time, the blowout product is separated by first entering an oil-gas-water separator on the ground, the gas phase generated after the separation enters the gas collection pipeline through a gas phase outlet of the oil-gas-water separator, the oil phase generated after the separation enters an oil collection pipeline through an oil phase outlet of the oil-gas-water separator, and the water phase generated after the separation enters a sewage treatment device through a water phase outlet of the oil-gas-water separator.
Further, on the basis of the embodiment shown in fig. 6, a detection unit is further included. The detection unit is used for detecting the pressure of a pump injection pipeline communicated with the acidizing fracturing pump truck.
Specifically, the pump-injection pipeline refers to a pipeline between the acidizing and fracturing pump truck 21 and the asphalt dispersant tank truck 22, the paraffin removal and control agent tank truck 23, the acid tank truck 24, the front tank truck 25, the rear tank truck 26 and the displacement tank truck 27 respectively.
And (3) testing the pressure of the upper pump injection pipeline at 95MPa (or testing the pressure at 125MPa) and stabilizing the pressure for 5min, determining that the pump injection pipeline is qualified, and can be used for conveying pump injection of the blockage removing liquid.
The method and the device for composite blockage removal of the high-pressure gas well are described in detail by specific embodiments.
When a gas production tree is overhauled in a certain high-pressure gas well for 9 months, the gas production tree has creamy yellow wax, and the gas production tree is blocked when wax is removed to 1840 m. The nozzle was inspected 9 months in the same year and found to be suspected of a mixture of wax and asphaltenes. The oil pressure of the well is continuously reduced in the production process until the oil pressure is 40.1MPa before composite blockage removal and the daily output gas is 37.16 multiplied by 104m3Daily oil production 9.78t, to prevent wellboreBlocking and shutting down the well, performing wax removal operation on the coiled tubing, and repeatedly flushing and lowering the coiled tubing until the coiled tubing is stopped and cannot pass through the coiled tubing after being lowered to 1416 m; and (4) putting the continuous oil pipe with a shoe mill for operation in the next 2 months, and finally shutting down the well when the continuous oil pipe is blocked at 3015.23 m. Taking out the white powder found by the lead seal, and taking out the white powder to carry out a hydrochloric acid titration experiment to find that the hydrochloric acid can dissolve the white powder.
The interpretation by using the composite blockage removing process and the composite blockage removing device for the high-pressure gas well comprises the following steps:
1. taking an on-site high-pressure gas well plug sample for analysis, and determining that the on-site plug mainly contains wax, asphaltene, inorganic scale and sandstone;
2. determining a formula of the blockage removing liquid according to the component content of the on-site blockage:
wax removing and preventing agent and asphalt dispersing agent: PPH-I type paraffin removal and prevention agent, HC-C20 type asphalt dispersant;
the acid liquor formula comprises: 8% hydrochloric acid, 5% waterproof locking agent, 3% acetic acid, 1% hydrofluoric acid, 2% clay stabilizer, 4% corrosion inhibitor (3.0% main agent, 1.5% auxiliary agent), 1% cleanup additive, 2% iron ion stabilizer, 0.3% friction reducer, 1% demulsifier and the balance of clear water;
the formula of the pad fluid is as follows: 3% of hydrochloric acid, 3% of a waterproof locking agent, 3% of acetic acid, 2% of a clay stabilizer, 4% of a corrosion inhibitor (3.0% of a main agent, 1.5% of an auxiliary agent), 1% of a cleanup additive, 2% of an iron ion stabilizer, 0.3% of a resistance reducing agent, 1% of a demulsifier and the balance of clear water;
the formula of the postposition liquid is as follows: 2% of HCl + 2% of corrosion inhibitor + 2% of iron ion stabilizer + 2% of clay stabilizer + 1% of demulsifier + 3% of acidification synergist + 10% of waterproof locking agent + the balance of clear water;
the formula of the displacement liquid is as follows: 0.5% of drag reducer, 0.5% of demulsifier, 1% of cleanup additive, 0.1% of bactericide, 1% of anti-swelling agent, 5% of waterproof locking agent and the balance of clear water;
3. determining the dosage of asphalt dispersant and paraffin removal and prevention agent according to the blocking position, wherein the dosage of the paraffin removal and prevention agent is 2m3Asphalt dispersant 2m3；
4. Determining the consumption of acid liquid, pad liquid, post liquid and displacement liquid according to the parameters of the inner volume of the tubing string, the stratum of the production interval and the like, wherein the pad liquid is 35m335m of postposition liquid3Displacing liquid 25m360m of acid liquor3；
5. Connecting a ground construction pipeline, and testing the pressure of the pump injection pipeline at 95MPa and stabilizing the pressure for 5min until the pressure is qualified;
6. 25m of pre-extrusion liquid3；
7. 2m each of low-extrusion asphalt dispersant and paraffin remover and inhibitor3: controlling construction pressure and discharge capacity, and extruding into asphalt dispersant and paraffin removal and prevention agent;
8. low extrusion postposition liquid 5m3: controlling construction pressure and discharge capacity to squeeze in postposition liquid;
9. trial extrusion of pad liquid 10m3: controlling construction pressure and discharge capacity to squeeze in pad fluid;
10. low squeezing acid liquor 60m3: injecting acid solution in 2 times, each time injecting 30m3；
11. Low-extrusion postposition liquid 30m3: controlling construction pressure and discharge capacity to squeeze in postposition liquid;
12. low-extrusion displacement liquid 25m3: extruding the acid solution and the postposition liquid into the stratum and the position below the packer;
13. closing a main valve of a gas production tree, and determining well closing reaction time according to actual field requirements;
14. disassembling a well mouth acidification construction pipeline;
15. and (5) after the acid rock reaction is finished, open-flow spraying to obtain the product.
In the above steps, the trial extrusion speed is 0.5-2m3Fluctuating in min, low extrusion speed of 0.5-1m3Fluctuating within/min.
After the shaft blockage removing construction is carried out according to the method, the oil pressure is increased to 52.3MPa, and the daily gas production is increased to 0.24 multiplied by 104m3The oil pressure output is stable, and the productivity is successfully recovered.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The composite blockage removing method for the high-pressure gas well is characterized by comprising the following steps of:
determining the components of a clear paraffin inhibitor, an asphalt dispersant and an acid liquor in the plugging removing liquid according to the blockage of the shaft;
according to the plugging position and the shaft parameters, determining the dosage of the paraffin removal and prevention agent in the plugging removal liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage;
and injecting the third dosage of acid liquor after injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft.
2. The composite unblocking method for high pressure gas well according to claim 1, further comprising the steps of:
determining the composition of a pad fluid, a post fluid and a displacement fluid in the blockage removing fluid according to the wellbore blockage;
and determining the usage amount of the front liquid in the plugging removal liquid as a fourth usage amount, determining the usage amount of the back liquid as a fifth usage amount, and determining the usage amount of the displacement liquid as a sixth usage amount according to the wellbore parameters.
3. The composite unblocking method for high pressure gas well according to claim 2, wherein the injecting the third amount of acid solution after the injecting the first amount of paraffin removal and prevention agent and the second amount of asphalt dispersant into the wellbore comprises:
injecting a portion of the pad fluid in the fourth volume to determine an injection pressure of the deblocking fluid;
injecting the first amount of paraffin removal and inhibition agent and the second amount of asphalt dispersant into the well bore according to the injection pressure;
injecting a portion of the fifth volume of the post fluid into the wellbore in accordance with the injection pressure;
injecting a remaining portion of the pad fluid into the wellbore in accordance with the injection pressure;
injecting the third amount of acid solution into the wellbore according to the injection pressure;
injecting a remaining portion of the post fluid into the wellbore in accordance with the injection pressure;
injecting the sixth amount of displacement fluid into the wellbore in accordance with the injection pressure.
4. The composite high pressure gas well plugging removal method of claim 3, wherein said injecting a portion of said fourth volume of pad fluid determines an injection pressure of said plugging removal fluid, comprising:
if the oil pipe is communicated with the casing, the injection pressure is not higher than the first annular pressure of the oil pipe and the casing;
otherwise, determining the injection pressure according to the smaller value of 80% of the external extrusion resistance strength of the inner-layer sleeve, 80% of the minimum internal pressure resistance strength of the outer-layer sleeve, 80% of the strength of the four-way lower flange of the pipe sleeve head and the pressure test value.
5. The composite unblocking method for high pressure gas well according to claim 1 or 3, further comprising shutting down the well after the completion of the injection of the unblocking liquid.
6. The composite high pressure gas well plug removal method of claim 1, wherein the wellbore parameters include tubing string internal volume, production interval formation parameters, and plug removal radius.
7. An apparatus for performing the composite high pressure gas well plug removal method of any of claims 1 to 6, comprising:
the analysis unit is used for determining the composition of a clear paraffin inhibitor, an asphalt dispersant and an acid solution in the plugging removing liquid according to the blockage of the shaft;
the system is also used for determining the dosage of the paraffin removal and prevention agent in the blockage removing liquid as a first dosage, determining the dosage of the asphalt dispersing agent as a second dosage and determining the dosage of the acid liquid as a third dosage according to the blockage position and the shaft parameters;
and the injection unit is used for injecting the first dosage of paraffin removal and prevention agent and the second dosage of asphalt dispersing agent into the shaft and then injecting the third dosage of acid liquor.
8. The apparatus of claim 7, wherein the analysis unit is further configured to determine a composition of a pad fluid, a post fluid, and a displacement fluid in the de-plugging fluid based on the wellbore blockage;
and the system is also used for determining the dosage of the front liquid in the plugging removal liquid as a fourth dosage, determining the dosage of the back liquid as a fifth dosage and determining the dosage of the displacement liquid as a sixth dosage according to the wellbore parameters.
9. The apparatus of claim 8, wherein the injection unit comprises an acid fracturing pump truck, an asphalt dispersant tanker, a paraffin removal and control agent tanker, an acid tanker, a front tanker, a rear tanker, a displacement tanker;
the asphalt dispersant tank truck, the paraffin removal and prevention agent tank truck, the acid liquor tank truck, the front tank truck, the rear tank truck and the displacement tank truck are respectively communicated with the acidizing and fracturing pump truck.
10. The apparatus of claim 9, further comprising a detection unit;
the detection unit is used for detecting the pressure of a pump injection pipeline communicated with the acidizing and fracturing pump truck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010192885.5A CN113494272A (en) | 2020-03-18 | 2020-03-18 | Composite blockage removing method and device for high-pressure gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010192885.5A CN113494272A (en) | 2020-03-18 | 2020-03-18 | Composite blockage removing method and device for high-pressure gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113494272A true CN113494272A (en) | 2021-10-12 |
Family
ID=77993197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010192885.5A Pending CN113494272A (en) | 2020-03-18 | 2020-03-18 | Composite blockage removing method and device for high-pressure gas well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113494272A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060219409A1 (en) * | 2005-03-29 | 2006-10-05 | Dyer Richard J | Method for simultaneous removal of asphaltine, and/or paraffin and scale from producing oil wells |
| CN102278092A (en) * | 2011-07-12 | 2011-12-14 | 西安石油大学 | Biological enzyme blocking removal process for blocking of inorganic scaling contained in strata |
| CN103740353A (en) * | 2013-12-16 | 2014-04-23 | 中国石油化工股份有限公司 | Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner |
| CN107558955A (en) * | 2016-07-01 | 2018-01-09 | 中国石油化工股份有限公司 | A kind of method of oil well microbial composite blockage relieving |
| CN110067533A (en) * | 2019-04-28 | 2019-07-30 | 西南石油大学 | A kind of biological enzyme Compound-acid removing clog in deep reservoir technique |
| 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 |
-
2020
- 2020-03-18 CN CN202010192885.5A patent/CN113494272A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060219409A1 (en) * | 2005-03-29 | 2006-10-05 | Dyer Richard J | Method for simultaneous removal of asphaltine, and/or paraffin and scale from producing oil wells |
| CN102278092A (en) * | 2011-07-12 | 2011-12-14 | 西安石油大学 | Biological enzyme blocking removal process for blocking of inorganic scaling contained in strata |
| CN103740353A (en) * | 2013-12-16 | 2014-04-23 | 中国石油化工股份有限公司 | Composite blocking remover and method for removing blockage of compact sandstone reservoir pressing crack commissioning horizontal well in composite manner |
| CN107558955A (en) * | 2016-07-01 | 2018-01-09 | 中国石油化工股份有限公司 | A kind of method of oil well microbial composite blockage relieving |
| 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 |
| CN110067533A (en) * | 2019-04-28 | 2019-07-30 | 西南石油大学 | A kind of biological enzyme Compound-acid removing clog in deep reservoir technique |
Non-Patent Citations (1)
| Title |
|---|
| 张明等: "SZ36-1油田稠油储层解堵酸化技术研究", 《非常规油气》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109736737B (en) | Method for snubbing tripping of reservoir gas drilling well | |
| CN111119828B (en) | Method for fracturing coal bed gas reservoir by using nitrogen foam fracturing fluid | |
| RU2670816C9 (en) | Method for sealing a production string | |
| RU2304710C1 (en) | Well bottom zone treatment process | |
| CN106014370A (en) | Oil-pipe under-pressure dragging fracturing device and technology | |
| CN103452531A (en) | Method for underbalanced tubing descending, non-well-killing gas lifting, rotary pumping, pump maintaining and tubing maintaining | |
| CN112627773A (en) | Gas well shaft compound blockage treatment method | |
| CN106761548A (en) | Method for injecting plugging agent into thick oil layer to plug strong water washing strip by fracturing | |
| CN112360368B (en) | Oil well water plugging method | |
| CN203939477U (en) | Integrated tubular column for oil testing and well completion operation | |
| CN113494272A (en) | Composite blockage removing method and device for high-pressure gas well | |
| CN114837619B (en) | Method and device for removing blockage of gas well | |
| CN113530511A (en) | Method for developing natural gas reservoir | |
| CN100412313C (en) | Plug-free cement filling method for well fixing | |
| CN113464096B (en) | Shaft acidizing and plug removing method for high-temperature and high-pressure gas well of carbonate rock | |
| CN105298443A (en) | Oil pipe float valve and blowout prevention, gas lift and fracture combined operation method for underbalance well completion oil pipe descending | |
| CN101545358B (en) | Erosion reducing system for gas drilling | |
| CN111836944B (en) | Device for cleaning clogged control lines | |
| CN113494271A (en) | Shaft blockage removing method and device for high-pressure gas well | |
| CN114198051B (en) | High-sulfur-content abandoned well sealing method | |
| RU2730158C1 (en) | Repair method of production casing of producing well | |
| CN201241691Y (en) | Pressure logging construction device capable of preventing cable brittle failure | |
| RU2783030C1 (en) | Method for thermochemical treatment of an oil reservoir | |
| CN113464095B (en) | Acidizing and blockage removing method for sandstone high-temperature and high-pressure gas well shaft | |
| CN115324523B (en) | Well shut-in control method, device, equipment and storage medium |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211012 |