CN112696178A - Sand prevention and precipitation method for high-water-content oil well - Google Patents
Sand prevention and precipitation method for high-water-content oil well Download PDFInfo
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- CN112696178A CN112696178A CN201911009964.1A CN201911009964A CN112696178A CN 112696178 A CN112696178 A CN 112696178A CN 201911009964 A CN201911009964 A CN 201911009964A CN 112696178 A CN112696178 A CN 112696178A
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- 239000004576 sand Substances 0.000 title claims abstract description 251
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000003129 oil well Substances 0.000 title claims abstract description 44
- 238000001556 precipitation Methods 0.000 title claims abstract description 43
- 230000002265 prevention Effects 0.000 title abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 38
- 238000010276 construction Methods 0.000 claims abstract description 34
- 230000000903 blocking effect Effects 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 282
- 239000007788 liquid Substances 0.000 claims description 50
- 239000006004 Quartz sand Substances 0.000 claims description 39
- 230000004888 barrier function Effects 0.000 claims description 26
- 238000005086 pumping Methods 0.000 claims description 23
- 239000012530 fluid Substances 0.000 claims description 21
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- 238000011049 filling Methods 0.000 abstract description 22
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- 238000009792 diffusion process Methods 0.000 description 3
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- 239000010985 leather Substances 0.000 description 3
- 229920002907 Guar gum Polymers 0.000 description 2
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- 239000000523 sample Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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Abstract
The invention discloses a sand prevention and precipitation method for a high-water-content oil well, and belongs to the technical field of oil extraction in oil fields. According to the method for preventing sand and lowering water for the high-water-content oil well, a proper amount of sand prevention and lowering water particles are firstly extruded, then gravel filling sand prevention construction is carried out, the sand prevention and lowering water particles are solidified to form a plugging layer under the condition that an oil layer is not polluted, a large pore channel formed by injected water or edge bottom water is plugged, and meanwhile gravel and a sieve tube form a high-flow-guide sand blocking belt. The method integrates the advantages of two sand prevention technologies, plays the dual effects of effectively reducing water and preventing sand, realizes the purposes of preventing sand, reducing water and increasing oil, and meets the production requirement in a high water-containing period.
Description
Technical Field
The invention relates to the technical field of oil extraction in oil fields, in particular to a sand prevention and precipitation method for a high-water-content oil well with a loose sandstone reservoir.
Background
At home and abroad, most loose sandstone reservoirs are developed to the middle and later stages, the water content rises, oil layer cements mainly comprising clay expand when meeting water and become loose, the cementing strength is reduced, and then particle displacement is generated, so that the sand production degree of the stratum is greatly aggravated. Meanwhile, sand production is aggravated due to too high production pressure difference caused by the production mode of large pump extract or an overlarge working system. As the production reservoir is heavily sanded, formation sloughing and large pore formations occur, further leading to high water cut and even flooding. This result has been a vicious cycle for development work, with water production and excessive production pressure differentials exacerbating sand production, and high water content with large amounts of sand production.
In the prior art, sand control technologies such as solution type sand pre-coating and plastic sand pre-coating are generally adopted to solve the problem of sand production. However, because the stratum is seriously lacked, a large pore is formed in an oil layer, the temperature of the oil layer is generally reduced, and the solution type sand control processes such as resin solution, sand stabilizing agent and the like are not applicable; the sand control process of artificial well wall, such as plastic pre-coated sand, has certain precipitation effect, and has the characteristics of simple construction and no construction pipe column left in a well shaft, but the application of the sand control process is limited because the cementing strength of the sand control process is lower than that of mechanical sand control and is not suitable for the production of large-pressure-difference extract.
Disclosure of Invention
Aiming at the development current situation of a high water cut period and the current process situation, the embodiment of the invention provides a sand prevention and precipitation method for a high water cut oil well in order to solve the problems of precipitation and sand production of the high water cut oil well.
Specifically, the method comprises the following technical scheme:
the sand control and precipitation method for the high-water-content oil well comprises the following steps:
the method comprises the following steps of putting a mechanical sand control pipe string into a sand control layer in a shaft of an oil well, wherein the mechanical sand control pipe string comprises a sieve pipe, a blind pipe and a plug which are sequentially connected from bottom to top;
pumping sand carrying liquid containing solidifiable sand-preventing and water-reducing particles into the sand-preventing target layer through a ground construction pipeline, wherein the sand carrying liquid containing solidifiable sand-preventing and water-reducing particles forms a grade I sand-blocking barrier at the sand-preventing target layer;
pumping a sand-carrying fluid containing quartz sand with a first particle size into the sand control target layer, wherein the sand-carrying fluid containing the quartz sand with the first particle size forms a II-grade sand blocking barrier at the sand control target layer, and the first particle size is 0.425-0.85 mm;
pumping a sand carrying liquid containing quartz sand with a second particle size into the sand control target layer, wherein the sand carrying liquid containing the quartz sand with the second particle size forms a grade III sand blocking barrier at the sand control target layer, and the second particle size is 0.6-1.18 mm; the second particle size is larger than the first particle size;
fishing the plug;
putting in a sand blocking cup packer to enable the sand blocking cup packer to be in butt joint with the blind pipe;
and (5) putting the oil well production pipe column into the well to finish production.
In one possible design, pumping a sand-carrying fluid containing solidifiable sand-control and precipitation-control particles into the sand-control target layer through a ground construction pipeline, wherein the sand-carrying fluid containing solidifiable sand-control and precipitation-control particles forms a grade I sand-blocking barrier at the sand-control target layer,
the mass ratio of the concretionable sand control precipitation particles to the sand carrying liquid is 6-8%.
In one possible design, the amount of the consolidable sand and water control and precipitation particles pumped per meter of the thickness of the sand control target layer is 1 to 2 tons.
In one possible design, a sand-carrying fluid containing quartz sand having a first particle size is pumped into the sand control target layer, the sand-carrying fluid containing quartz sand having the first particle size forms a class II sand barrier at the sand control target layer,
the mass ratio of the quartz sand with the first particle size to the sand carrying liquid is 10%, and the sand ratio is gradually increased to 35% by a gradient of 5 percentage points.
In one possible design, the amount of the sand containing silica sand having the first particle size pumped per meter of thickness of the sand control target layer is 6 to 8 tons.
In one possible design, a sand-carrying fluid containing quartz sand with a second particle size is pumped into the sand control target layer, the sand-carrying fluid containing quartz sand with the second particle size forms a grade III sand barrier at the sand control target layer,
the mass ratio of the quartz sand with the second particle size to the sand carrying liquid is 40%, and the sand ratio is gradually increased to 50% by a gradient of 5 percentage points.
In one possible design, the amount of the sand containing silica sand having the second particle size pumped per meter of the thickness of the sand control target layer is 1 to 2 tons.
In one possible design, prior to the running the string of mechanical sand control tubes into the well bore at the layer of sand control mesh, the method of sand control precipitation further comprises: and carrying out sand washing operation on the oil well shaft.
In one possible design, the sand wash operation includes: and providing a raw well pipe column, a lower sand washing pipe column and sand washing in the oil well shaft.
In one possible design, before the pumping of the sand-carrying fluid containing the consolidable sand control precipitation particles into the sand control objective zone through the surface construction pipeline, the sand control precipitation method further comprises:
and carrying out pressure test on the ground construction pipeline.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the sand prevention and precipitation method for the high-water-content oil well, a proper amount of sand prevention and precipitation particles are firstly squeezed, then gravel filling and sand prevention construction are carried out, the sand prevention and precipitation particles are solidified to form a plugging layer under the condition that an oil layer is not polluted, a large pore channel formed by injected water or bottom water is plugged, and meanwhile gravel and a screen pipe form a high-flow-guide sand blocking belt. The method integrates the advantages of two sand prevention technologies, plays the dual effects of effectively reducing water and preventing sand, realizes the purposes of preventing sand, reducing water and increasing oil, and meets the production requirement in a high water-containing period.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in 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 invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for preventing sand and water precipitation of a high-water-content oil well according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a pipe column formed after the method for preventing sand and precipitation of the high-water-content oil well is completed according to the embodiment of the invention.
The reference numerals in the drawings denote:
1-an oil well bore;
2-oil well production string;
3-sand control target layer;
4-mechanical sand control pipe string;
5-sand blocking cup packer;
a 6-I grade sand blocking barrier;
7-II level sand blocking barriers;
8-III level sand blocking barrier.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art.
The embodiment of the invention provides a sand control and precipitation method for a high-water-content oil well, which comprises the following steps of:
the mechanical sand prevention pipe string 4 is put into a sand prevention target layer 3 in the oil well shaft 1, and the mechanical sand prevention pipe string 4 comprises a sieve pipe, a blind pipe and a plug which are sequentially connected from bottom to top;
pumping sand-carrying liquid containing solidifiable sand-preventing and water-reducing particles into the sand-preventing target layer 3 through a ground construction pipeline, wherein the sand-carrying liquid containing solidifiable sand-preventing and water-reducing particles forms a grade I sand-blocking barrier 6 at the sand-preventing target layer 3;
pumping a sand carrying liquid containing quartz sand with a first particle size into the sand prevention target layer 3, wherein the sand carrying liquid containing the quartz sand with the first particle size forms a II-grade sand blocking barrier 7 at the sand prevention target layer 3;
pumping a sand carrying liquid containing quartz sand with a second particle size into the sand prevention target layer 3, wherein the sand carrying liquid containing the quartz sand with the second particle size forms a III-grade sand blocking barrier 8 at the sand prevention target layer 3; the second particle size is larger than the first particle size;
fishing the plug;
a sand blocking cup packer 5 is put in, so that the sand blocking cup packer 5 is butted with the blind pipe;
and (5) putting the oil well production pipe column 2 into the well to finish production.
According to the sand prevention and precipitation method for the high-water-content oil well, a proper amount of sand prevention and precipitation particles are firstly squeezed, then gravel filling and sand prevention construction are carried out, the sand prevention and precipitation particles are solidified to form a plugging layer under the condition that an oil layer is not polluted, a large pore channel formed by injected water or bottom water is plugged, and meanwhile gravel and a screen pipe form a high-flow-guide sand blocking belt. The method integrates the advantages of two sand prevention technologies, plays the dual effects of effectively reducing water and preventing sand, realizes the purposes of preventing sand, reducing water and increasing oil, and meets the production requirement in a high water-containing period.
Further, as shown in fig. 1, the method for preventing sand and water precipitation for a high-water-content oil well provided by the embodiment of the invention can comprise two operations of construction preparation and sand prevention construction. The construction preparation operation comprises the working procedures of extracting an oil well original well pipe column, lowering a sand washing pipe column, washing (filling) sand, finishing a sand prevention pipe column and the like, and the sand prevention construction operation comprises the working procedures of applying pressure to a ground pipeline, filling a shaft, preparing liquid, lowering water and preventing sand gravel filling construction, displacing liquid, diffusing pressure, salvaging a screwed plug, lowering a sand blocking leather cup packer and the like.
The construction preparation and sand control construction will be explained in more detail below with reference to fig. 1.
Firstly, preparation of construction
(1) Extracting the original well pipe column of the oil well; the oil well production string includes oil pipe, sucker rod and oil pump.
(2) A sand washing pipe column is lowered; tubing and sand wash nibs are run into the production casing matching the casing size, for example a conventional phi 139.7mm casing can run a phi 73mm tubing and a phi 73mm sand wash nib.
(3) Flushing (filling) sand; and the sand washing operation can be carried out after the sand washing pipe column is lowered to the sand surface position. Specifically, the well flushing fluid can be pumped into the sand flushing pipe string to flush sand to the bottom boundary 8 +/-0.5 m of the sand prevention target layer 3, then the well is flushed completely by more than one time of the shaft volume, the well is closed for 6 hours, the sand in the shaft 1 of the oil well is completely precipitated, the original pipe column repeatedly probes the sand surface position in the shaft 1 of the oil well, the sand surface change is qualified when the sand surface change is smaller than 0.5m, if the sand surface change is not qualified, the sand flushing program industry is continuously executed or the sand filling operation is carried out, the sand filling fluid can be pumped by a 400-type pump truck through an oil pipe, the sand filling fluid is a mixed solution of 0.425-0.85mm quartz sand and clear water, the well is closed for 6 hours after the sand filling is completed, the sand in the annular space of the oil sleeve is completely precipitated.
(4) Completing the sand prevention pipe column; after sand washing (filling) is qualified, a sand washing pipe column in the oil well shaft 1 is put in, a mechanical sand control pipe string 4 is put in according to the design requirement of single well sand control, the mechanical sand control pipe string 4 comprises a sieve pipe, a blind pipe and a plug which are sequentially connected from bottom to top, and the mechanical sand control pipe string 4 is put in a sand face position and then is seated on a well mouth to wait for gravel filling construction.
Second, sand prevention construction
(1) Carrying out pressure test on a ground construction pipeline; specifically, the pump truck can be connected to a wellhead oil pipe valve through a ground construction pipeline, the oil pipe valve is closed, the pump truck is used for pressurizing the ground construction pipeline, and the pump truck is qualified when the pressure of the pump truck is reduced to be less than 0.5MPa within a certain period of pressure stabilization.
(2) Filling a shaft; and after the pressure test is qualified, opening the oil pipe valve and the sleeve valve, injecting a sand-carrying liquid into the pump truck from the oil pipe, wherein the sand-carrying liquid can be clear water and 0.3% guar gum, and closing the sleeve gate after the liquid returns from the sleeve outlet.
(3) Pre-solution; the pump truck pumps the pre-posed liquid from the oil pipe and controls the pump pressure to be less than 21 MPa.
(4) Sand prevention and precipitation gravel filling construction; adding solidifiable sand-preventing and water-reducing particles into a sand-carrying liquid, wherein the mass percentage of the solidifiable sand-preventing and water-reducing particles to the sand-carrying liquid can be controlled to be 6-8%, the dosage (unit is ton) of the solidifiable sand-preventing and water-reducing particles is about 1-2 times of the thickness (unit is meter) of a sand-preventing target layer 3 (sand-producing stratum), so as to form a first-level sand-blocking barrier 6, continuously adding quartz sand with a certain particle size into the sand-carrying liquid, the mass percentage of the quartz sand to the sand-carrying liquid can be 10%, the sand ratio can be gradually increased to 35% by a gradient of 5 percentage points, the dosage (unit) of the quartz sand is about 6-8 times of the thickness (unit is meter) of the sand-preventing target layer 3, so as to form a second-level sand-blocking barrier 7, continuously adding quartz sand with a particle size larger than that of the second-level sand-blocking barrier 7 into the sand-carrying liquid, the mass percentage of the, the usage amount (unit is ton) of the quartz sand is about 1-2 times of the thickness (unit is meter) of the sand prevention target layer 3, a III-level sand blocking barrier 8 is formed after filling, and at the moment, a multi-level oil-permeable water-blocking sand blocking barrier is built on the sand production stratum through gravel filling. In addition, the sand blocking barrier formed by filling gravel is not easy to mix in a contact zone and has better permeability.
(5) Displacing the liquid; and (3) continuing pumping the sand-carrying liquid after stopping adding the sand, wherein the pumping amount is two quarters of the volume of the oil pipe in the oil well shaft 1, stopping pumping for a certain time, starting the pump truck, pumping the sand-carrying liquid at an idle speed, wherein the pumping amount is one quarter of the volume of the oil pipe in the oil well shaft 1, if the pressure is raised in the pumping process, ending the pumping, shutting down the well, and installing a pressure gauge in the oil casing to observe the pressure change.
(6) Diffusion pressure; the oil jacket pressure changes were observed at intervals.
(7) Fishing the plug; and after the pressure of the oil sleeve is reduced to 0, lowering the oil pipe to probe a sand surface and washing sand to the fish top position of the mechanical sand control pipe string 4, thoroughly washing the well by more than 1 time of the volume of the shaft, and fishing the plug by rotating the pipe column forward when the outlet is clean and free of sand.
(8) And (3) lower sand blocking leather cup packer 5: after the plug is successfully fished, the oil pipe is lifted out, the sand blocking cup packer 5 is put in, and after the sand blocking cup packer 5 is successfully butted with a blind pipe of the mechanical sand control pipe string 4 in the well, the ball is thrown, and the plug is positively pressed to release the plug, and the oil pipe is lifted out.
(3) And (3) well completion and production putting: and (5) putting the oil well production pipe column 2 according to the requirement of an oil production scheme.
Furthermore, the following examples are provided to illustrate the use of the sand and water control and precipitation method of the present invention and the resulting effects.
Taking the west 36-18 wells of the Hongkong oilfield, the well casing has an outer diameter of 139.7mm, an inner diameter of 124.1mm, and a production horizon of NmII21363 + 1366m, because the sand is seriously produced, normal production cannot be realized, and the production water content reaches 99.09%, the sand control and precipitation method of the high-water-content oil well is adopted for the well.
Construction preparation work
1) And (3) lifting the original well pipe column of the oil well: the oil well production pipe column 2 for normal production of the well is provided, and comprises an oil pipe, a sucker rod and an oil well pump.
2) And (3) lower sand washing pipe column: and (3) putting an oil pipe with the diameter of phi 73mm and a pen point with the diameter of phi 73mm into the production casing.
3) Sand flushing (filling): and (3) sand washing is carried out to 1374.0m, the well is shut in for 6 hours, the sand surface position is repeatedly detected to be 1374.2m, and the sand surface is qualified.
4) And (3) finishing the sand prevention pipe column: and (3) putting the sand washing pipe column, putting the mechanical sand control pipe string of 4-1374.2 m, setting the well mouth, and waiting for sand control construction to carry out sand control precipitation filling on the high-water-content oil well.
Sand prevention construction work
1) Pressure testing of a ground construction pipeline: and the ground pipeline is connected to the wellhead oil pipe valve by the pump truck, the oil pipe valve is closed, the ground pipeline of the pump truck is used for pressurizing to 25MPa, the pressure of the pump truck is not reduced within 5min of pressure stabilization, and the pressure test is qualified.
2) Filling a sleeve: and after the pressure test is qualified, opening the oil pipe valve and the casing valve, injecting a sand-carrying liquid into the pump truck from the oil pipe, wherein the sand-carrying liquid is clear water and 0.3% guar gum, and closing the casing gate after the liquid returns from the casing outlet.
3) Pre-solution: the pump truck pumps the pre-liquid 35m from the oil pipe3The pump truck discharge capacity is 1.8-2.0m3The pump pressure is 13.6 MPa.
4) Sand prevention and precipitation gravel packing construction: adding solidifiable sand-preventing and water-reducing particles into the sand-carrying liquid, wherein the mass percentage of the solidifiable sand-preventing and water-reducing particles to the sand-carrying liquid is 8%, and the dosage of the solidifiable sand-preventing and water-reducing particles is 10t, so as to form a first-level sand-blocking barrier 6, continuously adding quartz sand into the sand-carrying liquid, the particle size of the quartz sand is 0.425-0.85mm, the mass percentage of the quartz sand to the sand-carrying liquid is 10-35%, and the dosage of the quartz sand is 30t, so as to form a second-level sand-blocking barrier 7, continuously adding quartz sand into the sand-carrying liquid, the particle size of the quartz sand is 0.6-1.18mm, the mass percentage of the quartz sand to the sand-carrying liquid is 40-.
5) Displacing liquid: the sand-carrying liquid is continuously pumped after the sand adding is stopped, and the pumping amount is 1.2m3Stopping the pump for 5min, starting the pump truck, pumping the sand-carrying liquid at an idle speed, and pumping the sand-carrying liquid with the pumping quantity of 0.9m3When the pressure of the pump truck rises to 20MPa, the well is closed, and the oil casing is provided with a pressure gauge to observe the pressure change.
6) Diffusion pressure: the pressure change of the oil and the sleeve is observed every 2 h.
7) Fishing the plug: after 12h, the pressure diffusion of oil and casing is 0, the sand detection surface is 1332.3m, sand is washed to the position 1349.6m of the top of the cluster of the sand control pipe, and the well is thoroughly washed by 1 time of the volume of the shaft (15.8 m)3) And after the outlet is clean, the pipe column is rotated forward, and the plug is successfully fished.
8) And (3) lower sand blocking leather cup packer 5: after the plug is successfully fished, the oil pipe is lifted out, a sand blocking cup packer 5-1349.1 m is put in, after the sand blocking cup packer 5 is successfully butted with a blind pipe of a mechanical sand control pipe string 4 in the well, balls are thrown, and a releasing hand with positive pressure of 6.6MPa is lifted out.
And (3) well completion and production putting: and (5) setting a well completion production string according to the requirements of the oil production scheme. Wherein, the pipe column combination is phi 73mm oil pipe, the lower end depth is 1290m, the lower part is connected with a phi 38mm oil pump, and the lower end depth is 1296.07 m. The rod column combination is a sucker rod with phi 25mm, the depth of the lower end is 200m, the sucker rod with phi 22mm is connected downwards, the depth of the lower end is 1181m, the sucker rod with phi 19mm is connected downwards, a centralizer is additionally arranged, the depth of the lower end is 1290m, and the plunger of the oil pump is connected downwards.
Before the well is modified by the sand control and precipitation method for the high-water-content oil well, the daily output liquid is 42.17m30.38t of daily oil and 99.09 percent of water, and after the sand control and precipitation measures of the high water-cut oil well are implemented, the initial daily liquid is 30.23m37.1t of daily oil production, 76.5 percent of water content and 22.59 percent of water content reduction, and obtains better sand prevention and water reduction effects.
The sand prevention and precipitation method for the high-water-content oil well, provided by the embodiment of the invention, is continuous extrusion filling construction, has high construction efficiency, and can effectively shorten the operation period and reduce the operation cost.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sand control precipitation method for a high water content oil well is characterized by comprising the following steps:
the method comprises the following steps of putting a mechanical sand control pipe string into a sand control layer in a shaft of an oil well, wherein the mechanical sand control pipe string comprises a sieve pipe, a blind pipe and a plug which are sequentially connected from bottom to top;
pumping sand carrying liquid containing solidifiable sand-preventing and water-reducing particles into the sand-preventing target layer through a ground construction pipeline, wherein the sand carrying liquid containing solidifiable sand-preventing and water-reducing particles forms a grade I sand-blocking barrier at the sand-preventing target layer;
pumping a sand-carrying fluid containing quartz sand with a first particle size into the sand control target layer, wherein the sand-carrying fluid containing the quartz sand with the first particle size forms a II-grade sand blocking barrier at the sand control target layer, and the first particle size is 0.425-0.85 mm;
pumping a sand carrying liquid containing quartz sand with a second particle size into the sand control target layer, wherein the sand carrying liquid containing the quartz sand with the second particle size forms a grade III sand blocking barrier at the sand control target layer, and the second particle size is 0.6-1.18 mm; the second particle size is larger than the first particle size;
fishing the plug;
putting in a sand blocking cup packer to enable the sand blocking cup packer to be in butt joint with the blind pipe;
and (5) putting the oil well production pipe column into the well to finish production.
2. The sand control precipitation method of claim 1, wherein a sand-carrying fluid containing consolidated sand control precipitation particles is pumped into the sand control target layer through a surface construction pipeline, the sand-carrying fluid containing consolidated sand control precipitation particles forms a grade I sand barrier at the sand control target layer,
the mass ratio of the concretionable sand control precipitation particles to the sand carrying liquid is 6-8%.
3. The method of claim 2, wherein the amount of consolidated sand and precipitation controlling particles pumped per meter of thickness of the sand control target layer is 1 to 2 tons.
4. The sand control precipitation method of claim 1, wherein a sand-carrying fluid containing quartz sand having a first particle size is pumped into the sand control target layer, wherein the sand-carrying fluid containing quartz sand having the first particle size forms a second-stage sand barrier at the sand control target layer,
the mass ratio of the quartz sand with the first particle size to the sand carrying liquid is 10%, and the sand ratio is gradually increased to 35% by a gradient of 5 percentage points.
5. The sand control precipitation method according to claim 4, wherein the amount of the sand containing quartz sand having the first particle size pumped per meter of the thickness of the sand control target layer is 6 to 8 tons.
6. The sand control precipitation method of claim 1, wherein a sand-carrying fluid containing quartz sand having a second particle size is pumped into the sand control target layer, wherein the sand-carrying fluid containing quartz sand having the second particle size forms a grade III sand barrier at the sand control target layer,
the mass ratio of the quartz sand with the second particle size to the sand carrying liquid is 40%, and the sand ratio is gradually increased to 50% by a gradient of 5 percentage points.
7. The sand control precipitation method according to claim 6, wherein the amount of the sand containing quartz sand having the second particle size pumped per meter of the thickness of the sand control target layer is 1 to 2 tons.
8. The method of claim 1, wherein prior to running the string of mechanical sand control tubes into the well bore at the level of sand control, the method further comprises: and carrying out sand washing operation on the oil well shaft.
9. The sand control precipitation method of claim 8, wherein the sand wash operation comprises: and providing a raw well pipe column, a lower sand washing pipe column and sand washing in the oil well shaft.
10. The method of claim 1, wherein prior to said pumping a sand-carrying fluid containing consolidable sand control precipitation particles through a surface service line into said sand control destination, said method further comprises:
and carrying out pressure test on the ground construction pipeline.
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| CN115370327A (en) * | 2021-05-20 | 2022-11-22 | 中国石油天然气股份有限公司 | Method, sectioning and circulating gravel packing equipment for sand control operations in oil wells |
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