CN114575787B - Plugging removal pipe column and method for long well section polluted well - Google Patents
Plugging removal pipe column and method for long well section polluted well Download PDFInfo
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- CN114575787B CN114575787B CN202011395267.7A CN202011395267A CN114575787B CN 114575787 B CN114575787 B CN 114575787B CN 202011395267 A CN202011395267 A CN 202011395267A CN 114575787 B CN114575787 B CN 114575787B
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000003921 oil Substances 0.000 claims abstract description 165
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 239000010985 leather Substances 0.000 claims abstract description 29
- 238000011010 flushing procedure Methods 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003208 petroleum Substances 0.000 claims abstract description 5
- 235000019198 oils Nutrition 0.000 claims description 156
- 239000007788 liquid Substances 0.000 claims description 63
- 238000004140 cleaning Methods 0.000 claims description 26
- 230000000903 blocking effect Effects 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 14
- 238000005553 drilling Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000004927 clay Substances 0.000 claims description 7
- 238000005260 corrosion Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 239000003381 stabilizer Substances 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 4
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- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims description 3
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims description 3
- PXAJQJMDEXJWFB-UHFFFAOYSA-N acetone oxime Chemical compound CC(C)=NO PXAJQJMDEXJWFB-UHFFFAOYSA-N 0.000 claims description 3
- WGLDZLZWKPBBLK-UHFFFAOYSA-N aminomethyl dimethyl phosphate Chemical compound COP(=O)(OC)OCN WGLDZLZWKPBBLK-UHFFFAOYSA-N 0.000 claims description 3
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 3
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 3
- 235000019864 coconut oil Nutrition 0.000 claims description 3
- 239000003240 coconut oil Substances 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- LRMHFDNWKCSEQU-UHFFFAOYSA-N ethoxyethane;phenol Chemical compound CCOCC.OC1=CC=CC=C1 LRMHFDNWKCSEQU-UHFFFAOYSA-N 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 229940068041 phytic acid Drugs 0.000 claims description 3
- 239000000467 phytic acid Substances 0.000 claims description 3
- 235000002949 phytic acid Nutrition 0.000 claims description 3
- -1 polyoxyethylene octyl phenol Polymers 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 229940048842 sodium xylenesulfonate Drugs 0.000 claims description 3
- QUCDWLYKDRVKMI-UHFFFAOYSA-M sodium;3,4-dimethylbenzenesulfonate Chemical compound [Na+].CC1=CC=C(S([O-])(=O)=O)C=C1C QUCDWLYKDRVKMI-UHFFFAOYSA-M 0.000 claims description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- 239000011718 vitamin C Substances 0.000 claims description 2
- 239000008096 xylene Substances 0.000 claims description 2
- 239000010779 crude oil Substances 0.000 abstract description 6
- 239000003129 oil well Substances 0.000 abstract 1
- 101150038956 cup-4 gene Proteins 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000010276 construction Methods 0.000 description 9
- 230000020477 pH reduction Effects 0.000 description 6
- 230000035699 permeability Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 230000036632 reaction speed Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
-
- 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
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
Abstract
The disclosure provides a plug removal pipe column and a plug removal method for a long-well section polluted well, and belongs to the technical field of petroleum exploitation. The plug removal pipe column comprises a sleeve, a screen pipe, an oil pipe, a leather cup and a well flushing valve; the first end of the sleeve is connected with the first end of the screen pipe; the sieve tube is provided with a plurality of sieve holes at intervals along the axial direction, and the sieve holes penetrate through the inner wall and the outer wall of the sieve tube; the oil pipe is positioned in the sleeve and the screen pipe, the first end of the oil pipe is close to the second end of the sleeve, the second end of the oil pipe is close to the second end of the screen pipe, and an oil sleeve annulus is formed between the outer wall of the oil pipe and the inner wall of the sleeve; the leather cup is positioned between the sieve tube and the oil tube, the leather cup is sleeved on the outer wall of the oil tube, and the outer edge of the leather cup is propped against the outer wall of the sieve tube; the well flushing valve is communicated with the second end of the oil pipe. The plugging removing pipe column and the plugging removing method for the long-well section polluted well can thoroughly remove the plugging of the target layer and the near-well zone, and communicate and widen the flow channels of crude oil, the target layer fluid and the well shaft, so that the yield of the oil well and the injection quantity of the water injection well are improved.
Description
Technical Field
The disclosure belongs to the technical field of petroleum exploitation, and in particular relates to a plugging removal pipe column and a plugging removal method for a long-well section polluted well.
Background
In the process of drilling and completing well and producing a target layer of a long-well section polluted well, the target layer is extremely easy to pollute and block in a large area due to the reasons of the immersion of drilling mud or poor performance of plugging materials and the like.
In the related art, in order to relieve pollution and blockage of a target layer, a general acidification and blockage removal process is often adopted. When the general acid acidification blocking removal process is specifically constructed, firstly, injecting hydrochloric acid liquid to erode inorganic scale of a target layer so as to pretreat the target layer; and then using a soil acid system to erode and degrade the slurry and plugging material of the target layer, and finally using hydrochloric acid liquid to treat the target layer again to prevent secondary precipitation of the target layer by soil acid acidification measures, thereby thoroughly solving the problems of slurry pollution and plugging of the target layer.
However, when the general acidolysis blocking removal process is adopted to treat the target layer, because the acid liquor or the earth acid liquor is automatically fed into the target layer under the action of pressure in the acidification process, the acid liquor can not be uniformly dispersed in the target layer, and the blocking removal effect is poor.
Disclosure of Invention
The embodiment of the disclosure provides a plugging removal pipe column and a plugging removal method for a long-well section polluted well, which can thoroughly remove plugging of a target layer and a near-well zone, and communicate and widen the flow channels of crude oil, a target layer fluid and a well shaft, so as to improve the yield of the well and the injection quantity of a water injection well. The technical scheme is as follows:
the embodiment of the disclosure provides a plug removal pipe column for a long well section polluted well, which comprises a sleeve, a screen pipe, an oil pipe, a leather cup and a well washing valve;
the first end of the sleeve is connected with the first end of the screen pipe;
the sieve tube is provided with a plurality of sieve holes at intervals along the axial direction, and the sieve holes penetrate through the inner wall and the outer wall of the sieve tube;
the oil pipe is positioned in the sleeve and the screen pipe, the first end of the oil pipe is close to the second end of the sleeve, the second end of the oil pipe is close to the second end of the screen pipe, and an oil sleeve annulus is formed between the outer wall of the oil pipe and the inner wall of the sleeve;
the leather cup is positioned between the sieve tube and the oil tube, the leather cup is positioned between the two sieve holes, the leather cup is sleeved on the outer wall of the oil tube, and the outer edge of the leather cup is propped against the outer wall of the sieve tube;
the well flushing valve is communicated with the second end of the oil pipe.
In yet another implementation of the present disclosure, the cup includes two annular cone sleeves;
the two annular taper sleeves are sleeved on the outer wall of the oil pipe respectively, the outer diameter of the first end of each annular taper sleeve is larger than that of the second end, the first end of each annular taper sleeve faces the first end of the corresponding sleeve, and the second end of one annular taper sleeve is connected with the first end of the other annular taper sleeve.
In yet another implementation of the present disclosure, the first end of the screen is plugged into the first end of the casing, the plug removal string further includes a screen hanger located between the screen and the casing, an outer wall of the screen hanger being connected to an inner wall of the casing, the inner wall of the screen hanger being connected to an outer wall of the screen.
In yet another implementation of the present disclosure, the plug removal string further includes a sealing cannula, two ends of the sealing cannula are respectively connected to the tubing and the well flushing valve, and a first end of the sealing cannula is in communication with a second end of the tubing, and a second end of the sealing cannula is in communication with the well flushing valve.
In yet another implementation of the present disclosure, there is also provided a method of unblocking a long wellbore section contaminated well, the method comprising:
injecting a cleaning fluid from a first end of the oil jacket annulus such that the cleaning fluid is discharged from the first end of the oil pipe through the well flushing valve, the first end of the oil jacket annulus being an end proximate to the oil pipe;
injecting plugging removal liquid from the first end of the oil sleeve annulus, and closing the first end of the oil pipe;
and injecting protection liquid from the first end of the oil sleeve annulus, and opening the first end of the oil pipe, so that the blocking removal liquid is discharged from the first end of the oil pipe through the well flushing valve.
In yet another implementation of the present disclosure, the injecting the cleaning fluid from the first end of the oil jacket annulus such that the cleaning fluid is discharged from the first end of the oil pipe through the well flushing valve, the first end of the oil jacket annulus being an end proximate to the oil pipe, includes:
the volume of the cleaning liquid injected satisfies the following formula:
Q clearing heat ＝1.5(V Oil pipe +V Casing pipe )+L Screen pipe ×π(1.1R Drilling machine -T Screen screen -R Oil (oil) ) 2 ；
Wherein Q is Clearing heat An injection volume for the cleaning fluid; v (V) Oil pipe A volume for the tubing; v (V) Casing pipe Is the volume of the sleeve; l (L) Screen pipe Length of the screen; pi is the circumference ratio; r is R Drilling machine Drilling radius for the long wellbore section contaminated well; t (T) Screen screen Is the thickness of the screen pipe; r is R Oil (oil) Is the radius of the tubing.
In yet another implementation of the present disclosure, the injecting the plugging removal fluid from the first end of the oil jacket annulus and closing the first end of the oil pipe includes:
dividing the unblocking liquid into a first part and a second part;
injecting a first part of the plugging removal liquid from the first end of the oil sleeve annulus, and closing a wellhead gate of the oil pipe when the first part of the plugging removal liquid reaches the screen pipe;
injecting a second portion of the de-plugging fluid from a first end of the oil jacket annulus.
In yet another implementation of the present disclosure, the injection of the deblinking fluid into a second portion from a first end of the oil jacket annulus includes:
the volume of the unblocking liquid of the injected second portion satisfies the following formula:
when the long well section is a straight well,
wherein Q is Solution 2 An injection volume of the unblocking liquid for the second portion; r is R The position of the part Is the treatment radius; h is the length of the screen; porosity for the layer of interest;
when the long well section is a horizontal well and a highly inclined well, Q Solution 2 ＝1.5×L Screen pipe ×π(1.1R-T Screen screen -R Oil (oil) ) 2 ；
Wherein L is Screen pipe T for the length of the sieve tube Screen screen For the thickness of the sieve tube, R Oil (oil) Is the radius of the tubing.
In yet another implementation of the present disclosure, the injecting the protection fluid from the first end of the oil jacket annulus and opening the first end of the oil pipe such that the unblocking fluid is discharged from the first end of the oil pipe through the well flushing valve includes:
the volume of the protective liquid injected satisfies the following formula:
Q protection device ＝1.5(V Oil pipe +V Casing pipe )；
Wherein Q is Protection device An injection volume for the protection fluid; v (V) Oil pipe A volume for the tubing; v (V) Casing pipe Is the volume of the sleeve.
In yet another implementation of the present disclosure, the cleaning solution comprises 4-5 parts of polyoxyethylene octyl phenol ether, 4-5 parts of ethanol, 3-4 parts of cocamidopropyl betaine, 2-3 parts of xylene, 0.5-1 part of sodium xylene sulfonate, and the balance water;
the blocking remover comprises 8-10 parts of hydrochloric acid, 2-3 parts of fluoboric acid, 1-2 parts of corrosion inhibitor, 0.5-1 part of clay stabilizer, 0.5-1 part of sodium iso-vitamin C, 0.1-0.2 part of coconut oil fatty acid diethanolamide, 0.1-0.3 part of aminotrimethyl phosphoric acid, 0.1-0.2 part of phytic acid and the balance of water;
the protective liquid comprises 2 parts of potassium chloride, 1-2 parts of clay stabilizer, 0.3-0.5 part of sodium dodecyl benzene sulfonate, 0.1-0.2 part of petroleum sodium sulfonate, 0.1-0.2 part of dimethyl ketoxime and the balance of water.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that:
when the plugging removal pipe column for the long-well section polluted well is plugged, the plugging removal pipe column comprises a sleeve, a screen pipe, an oil pipe and a leather cup, so that well cementation can be carried out through the sleeve, and meanwhile, an installation foundation is provided for the screen pipe. And form the oil jacket annular space between oil pipe and the sleeve pipe, can form the overflow channel through oil jacket annular space and oil pipe between for the unblocking liquid can be from oil jacket annular space injection, is back-discharged simultaneously from oil pipe 3.
Moreover, as the leather cup is positioned between the sieve tube and the oil tube, the outer edge of the leather cup is propped against the sieve tube, so that the plugging removing liquid can flow from the inside to the outside of the sieve tube from the sieve holes of the sieve tube through the guide resistance of the leather cup, and further, pollutants such as mud, organic scale and the like outside the sieve tube are cleaned, dispersed, stripped and degraded and permeated, thereby expanding the circulation channels outside the sieve tube and achieving the purpose of uniformly distributing acid in a target layer.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of a plug removal string for a long wellbore section contaminated well provided in an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for unblocking a long wellbore section contaminated well provided in an embodiment of the present disclosure;
fig. 3 is a flow chart of another method for unblocking a long wellbore section contaminated well provided by an embodiment of the present disclosure.
The symbols in the drawings are as follows:
1. a sleeve; 2. a screen pipe; 21. a sieve pore; 3. an oil pipe;
4. a leather cup; 41. an annular taper sleeve; 5. a well flushing valve; 6. an oil jacket annulus; 7. a screen hanger; 8. sealing the cannula.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
The embodiment of the disclosure provides a plug removal pipe column, as shown in fig. 1, the plug removal pipe column comprises a casing 1, a screen pipe 2, an oil pipe 3, a leather cup 4 and a well flushing valve 5; the first end of the sleeve 1 is connected with the first end of the screen pipe 2; the screen pipe 2 is provided with a plurality of screen holes 21 at intervals along the axial direction, and the screen holes 21 penetrate through the inner wall and the outer wall of the screen pipe 2; the oil pipe 3 is positioned in the sleeve 1 and the screen pipe 2, the first end of the oil pipe 3 is close to the second end of the sleeve 1, the second end of the oil pipe 3 is close to the second end of the screen pipe 2, and an oil sleeve annulus 6 is formed between the outer wall of the oil pipe 3 and the inner wall of the sleeve 1; the leather cup 4 is positioned between the sieve tube 2 and the oil tube 3, the leather cup 4 is positioned between the two sieve holes 21, the leather cup 4 is sleeved on the outer wall of the oil tube 3, and the outer edge of the leather cup 4 is propped against the outer wall of the sieve tube 2; the well flushing valve 5 is communicated with the second end of the oil pipe 3.
When the plugging removal pipe column for the long-well section polluted well provided by the embodiment of the disclosure is used for plugging removal, the plugging removal pipe column comprises the casing 1, the screen pipe 2, the oil pipe 3 and the leather cup 4, so that well cementation can be carried out through the casing 1, and meanwhile, an installation foundation is provided for the screen pipe 2. And form oil jacket annular space 6 between oil pipe 3 and the sleeve pipe 1, can form the overflow channel through oil jacket annular space 6 and oil pipe 3 for the unblock liquid can be from oil jacket annular space 6 injection, simultaneously from oil pipe 3 reverse drainage.
Moreover, as the leather cup 4 is positioned between the sieve tube 2 and the oil tube 3, the outer edge of the leather cup 4 is propped against the sieve tube 2, so that the plugging removing liquid can flow from the inside to the outside of the sieve tube 2 through the guiding resistance of the leather cup 4, and further the pollutants such as mud, organic scale and the like outside the sieve tube 2 are cleaned, dispersed, stripped, degraded and permeated, thereby enlarging the circulation channel outside the sieve tube 2 and achieving the purpose of uniformly distributing acid in a target layer.
Illustratively, the cup 4 includes two annular cones 41; the two annular taper sleeves 41 are respectively sleeved on the outer wall of the oil pipe 3, the outer diameter of the first end of each annular taper sleeve 41 is larger than that of the second end, the first end of each annular taper sleeve 41 faces the first end of the sleeve 1, and the second end of one annular taper sleeve 41 is connected with the first end of the other annular taper sleeve 41.
In the above implementation, the annular cone sleeve 41 is used to block the fluid entering the oil sleeve annulus 6, so that the fluid can flow from the inside to the outside of the screen pipe 2 under the double extrusion of the annular cone sleeve 41, and then the pollutants in the stratum are cleaned and deblocked.
Illustratively, the first end of the screen 2 is plugged into the first end of the casing 1, the plug removal string further comprises a screen hanger 7, the screen hanger 7 is located between the screen 2 and the casing 1, the outer wall of the screen hanger 7 is connected to the inner wall of the casing 1, and the inner wall of the screen hanger 7 is connected to the outer wall of the screen 2.
In the above described implementation, the screen hanger 7 is used to attach the screen 2 to the casing 1 to complete the assembly of the screen 2.
Illustratively, the plug removal string further comprises a sealing cannula 8, both ends of the sealing cannula 8 are respectively connected with the oil pipe 3 and the well flushing valve 5, and a first end of the sealing cannula 8 is communicated with a second end of the oil pipe 3, and a second end of the sealing cannula 8 is communicated with the well flushing valve 5.
In the above described implementation, the sealing cannula 8 is used to assemble the second end of the tubing 3 with the well-flushing valve 5 to facilitate the back-drainage of fluid in the layer of interest into the tubing 3 through the well-flushing valve 5.
The casing 1, the oil pipe 3, the screen pipe hanger 7 and the well flushing valve 5 in the above plug removal pipe string are all well completion pipe strings. The leather cup 4 and the sealing cannula 8 are acidified tubular columns.
The cups 4 can be deployed in specific numbers and positions according to the length and pollution level of the long well section.
The embodiment of the disclosure also provides a blocking removal method, as shown in fig. 2, which is based on the blocking removal pipe column, and includes:
s201: injecting a cleaning fluid from a first end of the oil jacket annulus such that the cleaning fluid is discharged from the first end of the oil pipe through the well flushing valve, the first end of the oil jacket annulus being the end proximate the oil pipe.
S202: and injecting plugging removal liquid from the first end of the oil sleeve annulus, and closing the first end of the oil pipe.
S203: and injecting protective liquid from the first end of the oil sleeve annulus, and opening the first end of the oil pipe so that the blocking removing liquid is discharged from the first end of the oil pipe through the well flushing valve.
When the method is used for unblocking, because the cleaning liquid, the unblocking liquid and the protecting liquid are sequentially injected into the target layer in the unblocking method, the target layer can be cleaned, dispersed, stripped, degraded and permeated through the cleaning liquid, meanwhile, the temperature of a shaft is reduced, the reaction speed of the unblocking liquid injected subsequently, the stratum and the scale is slowed down, and H is caused + Can lead to deep stratum and further communicate stratum pores and cracks. Meanwhile, the porosity and permeability of the target layer are improved through the plugging removal liquid, and the crude oil is communicated with the well bore. And finally, through the protective liquid, the target layer can form a compact and ordered protective film, and meanwhile, the plugging removing liquid injected before is pushed into the deep part of the stratum.
By using the plugging removal pipe column, the plugging removal liquid can be uniformly distributed on the target layer, the problem of pollution and blockage of a long well section is solved, and the effective rate of measures is increased; the method adopts one-pass pipe column, is safe in construction, and is simple and effective.
Fig. 3 is a flowchart of another method for unblocking a long wellbore section contaminated well provided by an embodiment of the present disclosure, and in combination with fig. 3, the method includes:
s301: injecting a cleaning fluid from a first end of the oil jacket annulus such that the cleaning fluid is discharged from the first end of the oil pipe through the well flushing valve, the first end of the oil jacket annulus being the end proximate the oil pipe.
In the implementation mode, the cleaning liquid has the functions of cleaning, dispersing, stripping, degrading and penetrating, and can reduce the temperature of a shaft, further reduce and relieve the reaction speed of the plugging liquid, the stratum and the scale through temperature reduction, and improve H + Flow to the depth of the formation further communicates with formation pores and fractures.
Illustratively, the volume of injected cleaning fluid satisfies the following equation:
Q clearing heat ＝1.5(V Oil pipe +V Casing pipe )+L Screen pipe ×π(1.1R Drilling machine -T Screen screen -R Oil (oil) ) 2 (1)
Wherein Q is Clearing heat An injection volume for the cleaning fluid; v (V) Oil pipe The volume of the oil pipe; v (V) Casing pipe Is the volume of the sleeve; l (L) Screen pipe Is the length of the sieve tube; pi is the circumference ratio; r is R Drilling machine Drilling radius for long well section polluted well; t (T) Screen screen Is the thickness of the sieve tube; r is R Oil (oil) Is the radius of the oil pipe.
S302: dividing the blocking remover into a first part and a second part.
S303: and injecting the plugging removal liquid of the first part from the first end of the oil sleeve annulus, and closing a wellhead gate of the oil pipe when the plugging removal liquid of the first part reaches the sieve tube.
Illustratively, the volume of the deblock fluid injected into the first portion satisfies the following equation:
Q solution 1 ＝V Straight sleeve -V Straight oil (2)
Wherein Q is Solution 1 An injection volume of the unblocking liquid for the first portion; v (V) Straight sleeve The volume of the straight pipe section of the sleeve is that of the straight pipe section of the sleeve; v (V) Straight oil Is the volume of the straight pipe section of the oil pipe.
S304: and injecting the plugging removal liquid of the second part from the first end of the oil sleeve annulus.
Illustratively, the volume of the deblock fluid injected into the second portion satisfies the following equation:
when the long well section is a straight well,
wherein Q is Solution 2 An injection volume of the unblocking liquid for the second portion; r is R The position of the part Is the treatment radius; h is the length of the sieve tube; for the porosity of the layer of interest.
When the long well section is a vertical well, the screen pipe corresponds to the perforation section of the casing, so that H is the length of the perforation section.
When the long well section is a horizontal well and a large inclined well, Q Solution 2 ＝1.5×L Screen pipe ×π(1.1R-T Screen screen -R Oil (oil) ) 2 (4)
Wherein L is Screen pipe For the length of the sieve tube, T Screen screen For the thickness of the sieve tube, R Oil (oil) Is the radius of the oil pipe.
In the implementation mode, the plugging removing liquid has the functions of corrosion (dissolving and polluting mud, scale, acid soluble matters in the stratum), corrosion inhibition, swelling prevention, chelation and the like, and improves the porosity and permeability of the stratum so as to communicate the circulation of crude oil and a shaft.
S305: and injecting protective liquid from the first end of the oil sleeve annulus, and opening the first end of the oil pipe so that the blocking removing liquid is discharged from the first end of the oil pipe through the well flushing valve.
The injection volume of the protection liquid is calculated by the following formula:
Q protection device ＝1.5(V Oil pipe +V Casing pipe ) (5)
Wherein Q is Protection device The injection volume of the protective liquid; v (V) Oil pipe The volume of the oil pipe; v (V) Casing pipe Is the volume of the sleeve.
In the implementation mode, the protecting liquid can form a compact and ordered protecting film, and the plugging removing liquid injected before is pushed into the deep place of the stratum.
In the embodiment, the cleaning liquid comprises 4-5 parts of polyoxyethylene octyl phenol ether, 4-5 parts of ethanol, 3-4 parts of cocamidopropyl betaine, 2-3 parts of dimethylbenzene, 0.5-1 part of sodium xylene sulfonate and the balance of water.
The blocking remover comprises 8-10 parts of hydrochloric acid, 2-3 parts of fluoboric acid, 1-2 parts of corrosion inhibitor, 0.5-1 part of clay stabilizer (organic salt clay stabilizer), 0.5-1 part of sodium iso-VC, 0.1-0.2 part of coconut oil fatty acid diethanolamide, 0.1-0.3 part of aminotrimethylphosphoric acid and 0.1-0.2 part of phytic acid, and the balance of water.
The protective liquid comprises 2 parts of potassium chloride, 1-2 parts of clay stabilizer, 0.3-0.5 part of sodium dodecyl benzene sulfonate, 0.1-0.2 part of sodium petroleum sulfonate, 0.1-0.2 part of dimethyl ketoxime and the balance of water.
In the implementation mode, the method adopts cleaning liquid, blocking removing liquid and protective liquid, and the three liquids are synergistic to improve the blocking removing effect.
First, the cleaning fluid is a neutral fluid that has cleaning, dispersion stripping, degradation, penetration and can reduce wellbore temperatures. The temperature reduction can reduce and relieve the reaction speed of the plugging liquid, the stratum and the scale, and the effective H+ can be led to the deep part of the stratum to further communicate with the pores and cracks of the stratum.
The plugging removing liquid has the functions of corrosion (dissolving and polluting mud, scale, acid soluble matters in stratum), corrosion inhibition, swelling prevention, chelation and the like, improves the porosity and permeability of the stratum, and communicates the circulation of crude oil and a shaft.
The protective liquid can form a compact and ordered protective film and push acid liquor into the deep part of the stratum.
The method can shunt acid distribution, solves the problem of pollution and blockage of long well sections, and increases the effective rate of measures; the method adopts one-pass pipe column, is safe in construction, and is simple and effective.
The operation of the above unblocking method is further described below with specific examples:
the above blocking remover is successfully tested for 3 times on site, and the construction success rate is 100%.
Example 1: the jujube A well is a straight well, the well is completed in 2019.10.19 days, the length of a well section of a target layer is 186 m, the lithology is fine sandstone, the cementing is good, sand is not produced, and the well is lost in the well drilling process (specific data can be seen in table 1).
Table 1 completion casing data
According to the conditions of the well Shi Qingkuang and physical properties, the pollution of mud and plugging materials in the drilling process is required to be relieved, the stratum permeability is recovered, cracks are communicated, a long-well-section acidification plugging removal process is adopted, and the concrete construction pumping procedure is as follows:
TABLE 2 jujube A well construction procedure and parameters
Example 2: the hole B well is a horizontal well, the target layer is NgII, the sieve tube section is 290.9 m, the lithology of the target layer is fine sandstone, the slurry is leaked and polluted in the drilling process, the pump is inspected in 2019 for 6 months, and the problem that the external scaling is serious in the original well oil tube is solved.
Table 3 well completion casing data for well B
According to the physical properties of the well Shi Qingkuang and the reservoir, in order to remove the pollution of mud and scale and recover the seepage capability of the stratum, the above-mentioned blocking removal method is adopted, and the concrete construction pumping procedure is as follows:
TABLE 4 working procedure for hole B well construction and parameters
Example 3: the south C well is a well with a large inclination, the target layer is a plate II, lithology is siltstone, fine sandstone and mudstone, the well is completed by adopting an upper cementing well and a lower precise composite sand filtering pipe, and the length of a screen pipe section is 372m.
Table 5 completion casing data
The well is a new well, slurry pollution exists in the drilling process to thoroughly clean a lower dense composite sand filtering pipe, a well shaft and a near-wellbore crude oil channel are communicated, a long well section acidification blocking removal process is adopted, and a concrete construction pumping program is as follows:
TABLE 6 south C well construction procedure and parameters
The foregoing is merely an alternative embodiment of the present disclosure, and is not intended to limit the present disclosure, any modification, equivalent replacement, improvement, etc. that comes within the spirit and principles of the present disclosure are included in the scope of the present disclosure.
Claims (5)
1. A plug removal method for a long-well section polluted well, which is based on a plug removal pipe column for the long-well section polluted well, and is characterized by comprising a sleeve (1), a screen pipe (2), an oil pipe (3), a leather cup (4) and a well flushing valve (5);
the first end of the sleeve (1) is connected with the first end of the screen pipe (2);
the screen pipe (2) is provided with a plurality of screen holes (21) at intervals along the axial direction, and the screen holes (21) penetrate through the inner wall and the outer wall of the screen pipe (2);
the oil pipe (3) is positioned in the casing (1) and the screen pipe (2), the first end of the oil pipe (3) is close to the second end of the casing (1), the second end of the oil pipe (3) is close to the second end of the screen pipe (2), and an oil sleeve annulus (6) is formed between the outer wall of the oil pipe (3) and the inner wall of the casing (1);
the leather cup (4) is positioned between the sieve tube (2) and the oil tube (3), the leather cup (4) is positioned between the two sieve holes (21), the leather cup (4) is sleeved on the outer wall of the oil tube (3), and the outer edge of the leather cup (4) is propped against the outer wall of the sieve tube (2);
the well flushing valve (5) is communicated with the second end of the oil pipe (3);
the blocking removing method comprises the following steps:
injecting a cleaning fluid from a first end of the oil jacket annulus such that the cleaning fluid is discharged from a first end of the oil pipe through the well flushing valve, the first end of the oil jacket annulus being an end proximate to the oil pipe, the volume of the cleaning fluid injected satisfying the following equation:
Q clearing heat ＝1.5(V Oil pipe +V Casing pipe )+L Screen pipe ×π(1.1R Drilling machine -T Screen screen -R Oil (oil) ) 2 ；
Wherein Q is Clearing heat An injection volume for the cleaning fluid; v (V) Oil pipe A volume for the tubing; v (V) Casing pipe Is the volume of the sleeve; l (L) Screen pipe Length of the screen; pi is the circumference ratio; r is R Drilling machine Drilling radius for the long wellbore section contaminated well; t (T) Screen screen Is the thickness of the screen pipe; r is R Oil (oil) Radius of the oil pipe;
injecting plugging removal liquid from the first end of the oil sleeve annulus, and closing the first end of the oil pipe; dividing the unblocking liquid into a first part and a second part; injecting a first part of plugging removal liquid from the first end of the oil sleeve annulus, closing a wellhead gate of the oil pipe when the first part of plugging removal liquid reaches the screen pipe, wherein the volume of the first part of plugging removal liquid meets the following formula:
Q solution 1 ＝V Straight sleeve -V Straight oil
Wherein Q is Solution 1 An injection volume of the unblocking liquid for the first portion; v (V) Straight sleeve The volume of the straight pipe section of the sleeve is that of the straight pipe section of the sleeve; v (V) Straight oil The volume of the straight pipe section of the oil pipe is;
injecting a second portion of the plugging removal fluid from a first end of the oil jacket annulus, the volume of the injected second portion of the plugging removal fluid satisfying the following equation:
when the long well section is a straight well,
wherein Q is Solution 2 An injection volume of the unblocking liquid for the second portion; r is R The position of the part Is the treatment radius; h is the length of the screen; phi is the porosity of the target layer;
when the long well section is a horizontal well and a highly inclined well, Q Solution 2 ＝1.5×L Screen pipe ×π(1.1R-T Screen screen -R Oil (oil) ) 2 ；
Wherein L is Screen pipe T for the length of the sieve tube Screen screen For the thickness of the sieve tube, R Oil (oil) Radius of the oil pipe;
injecting protection liquid from the first end of the oil sleeve annulus, and opening the first end of the oil pipe, so that the blocking removal liquid is discharged from the first end of the oil pipe through the well flushing valve, and the volume of the protection liquid is injected to satisfy the following formula:
Q protection device ＝1.5(V Oil pipe +V Casing pipe )；
Wherein Q is Protection device An injection volume for the protection fluid; v (V) Oil pipe A volume for the tubing; v (V) Casing pipe Is the volume of the sleeve.
2. The unblocking method according to claim 1, wherein the cup (4) comprises two annular cone sleeves (41);
the two annular taper sleeves (41) are respectively sleeved on the outer wall of the oil pipe (3), the outer diameter of the first end of each annular taper sleeve (41) is larger than that of the second end, the first end of each annular taper sleeve (41) faces the first end of the corresponding sleeve (1), and the second end of one annular taper sleeve (41) is connected with the first end of the other annular taper sleeve (41).
3. The plug removal method according to claim 1, wherein the first end of the screen (2) is plugged into the first end of the casing (1), the plug removal string further comprising a screen hanger (7), the screen hanger (7) being located between the screen (2) and the casing (1), an outer wall of the screen hanger (7) being connected to an inner wall of the casing (1), an inner wall of the screen hanger (7) being connected to an outer wall of the screen (2).
4. The unblocking method according to claim 1, wherein the unblocking string further comprises a sealing cannula (8), both ends of the sealing cannula (8) are connected to the oil pipe (3) and the well flushing valve (5), respectively, and a first end of the sealing cannula (8) is in communication with a second end of the oil pipe (3), and a second end of the sealing cannula (8) is in communication with the well flushing valve (5).
5. The unblocking method according to claim 1, wherein the cleaning solution comprises 4-5 parts of polyoxyethylene octyl phenol ether, 4-5 parts of ethanol, 3-4 parts of cocamidopropyl betaine, 2-3 parts of xylene, 0.5-1 part of sodium xylene sulfonate, and the balance water;
the blocking remover comprises 8-10 parts of hydrochloric acid, 2-3 parts of fluoboric acid, 1-2 parts of corrosion inhibitor, 0.5-1 part of clay stabilizer, 0.5-1 part of sodium iso-vitamin C, 0.1-0.2 part of coconut oil fatty acid diethanolamide, 0.1-0.3 part of aminotrimethyl phosphoric acid, 0.1-0.2 part of phytic acid and the balance of water;
the protective liquid comprises 2 parts of potassium chloride, 1-2 parts of clay stabilizer, 0.3-0.5 part of sodium dodecyl benzene sulfonate, 0.1-0.2 part of petroleum sodium sulfonate, 0.1-0.2 part of dimethyl ketoxime and the balance of water.
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