CN112112608A - Comprehensive treatment method for collapse well of carbonate reservoir - Google Patents
Comprehensive treatment method for collapse well of carbonate reservoir Download PDFInfo
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- CN112112608A CN112112608A CN201910541333.8A CN201910541333A CN112112608A CN 112112608 A CN112112608 A CN 112112608A CN 201910541333 A CN201910541333 A CN 201910541333A CN 112112608 A CN112112608 A CN 112112608A
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 114
- 239000003129 oil well Substances 0.000 claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 claims abstract description 49
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 58
- 238000005553 drilling Methods 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 2
- 230000001186 cumulative effect Effects 0.000 claims 2
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 210000004916 vomit Anatomy 0.000 description 2
- 230000008673 vomiting Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21B43/10—Setting of casings, screens, liners or the like in wells
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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Abstract
The embodiment of the invention provides a comprehensive treatment method for a collapsed well of a carbonate reservoir, which comprises the following steps: determining the type of a target well of the carbonate reservoir; if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located; and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe. By replacing open hole well completion with supporting sand control screen well completion, the collapse of a shaft of an oil well is prevented, the service life of the oil well is prolonged, the influence on the liquid supply capacity of the oil well due to sand burying at the bottom of a reservoir is avoided, and the productivity of the oil well is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil and gas field development, in particular to a comprehensive treatment method for a collapsed well of a carbonate reservoir.
Background
Carbonate oil and gas reserves an extremely important position in global oil and gas resources. The oil and gas resource amount is about 70% of the global oil and gas resource, the exploratory recoverable reserves account for 50%, and the output is about 60%. Carbonate rock oil gas resources are rich in China, carbonate rock blocks are developed quickly, and carbonate rock oil reservoirs become important fields of oil gas exploration and development and oil gas storage increasing and production increasing.
Compared with sandstone oil and gas reservoirs, carbonate oil and gas reservoirs have the characteristics of multiple reservoir space types and large secondary change, so that the carbonate oil field is difficult to exploit and has high matching technical requirements.
Currently, as the development of oil fields continues, the exploitation using conventional open-hole completions results in carbonate reservoir wells having at least the following technical problems: the reservoir of the oil well collapses seriously, so that the sand burying at the bottom of the reservoir bottom is caused, the liquid supply capacity of the oil well is influenced, and even a production flow channel is directly blocked, so that the oil well cannot produce.
Disclosure of Invention
The embodiment of the invention provides a comprehensive treatment method for a collapsed well of a carbonate reservoir, which aims to solve the problems that the reservoir of an oil well is collapsed seriously, the reservoir, namely, sand burying in the field is caused, the liquid supply capacity of the oil well is influenced, and a production flow channel is directly blocked if the reservoir is seriously collapsed, so that the oil well cannot produce.
The embodiment of the invention provides a comprehensive treatment method for a collapsed well of a carbonate reservoir, which comprises the following steps:
determining the type of a target well of the carbonate reservoir;
if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer;
the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located;
and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
In one possible design, the support sand control screen has a pore size that is 60% of the average sand production particle size of the block in which the target well is located.
In one possible design, if the target well is of a type that is an old well with an earlier open hole completion; the method further comprises the following steps:
and when the target well is seriously collapsed, replacing a workover rig with a well drilling machine to carry out workover operation on the target well.
In one possible design, the performing a workover operation on the target well with a drilling well instead of a workover rig includes:
and performing micro sidetrack drilling on the target well by using the drilling well and the original well hole, so that the reservoir opening degree of the target well is increased.
In one possible design, if the type of the target well is hanging a sand control or producing zone sand control blocked oil well in the well; the method further comprises the following steps:
and performing well washing operation on the target well by adopting an intermediate phase well washing technology.
In one possible design, the mesophase wash technique comprises:
during the well washing operation, the screen pipe is cleaned by changing the displacement to generate hydraulic jet.
In one possible design, the varying the displacement includes:
if the pressure of the well washing pump truck is lower than 5Mpa, the well washing is carried out by adopting the discharge capacity of 20-25 square/hour;
if the pressure of the well washing pump truck is 5-10Mpa, the well washing is carried out by adopting the discharge capacity of 15-20 square/hour;
if the pressure of the well washing pump truck is 10-15MPa, the well washing is carried out by adopting the discharge capacity of 10-15 square/hour;
if the pressure of the well washing pump truck is 15-20MPa, the well washing is carried out by adopting the discharge capacity of 8-10 square/hour;
if the pressure of the well washing pump truck is 20-25MPa, the well washing is carried out by adopting the discharge capacity of 6-8 square/hour;
if the pressure of the well washing pump truck is 25-30MPa, the well washing is carried out by adopting the discharge capacity of 5-7 square/hour;
if the pressure of the well washing pump truck is 30-40MPa, the well washing is carried out by adopting the discharge capacity of 4-5 square/hour;
and if the pressure of the well washing pump truck is more than 40Mpa, adopting the discharge capacity of 3 square/hour to wash the well.
In one possible design, the well flushing is stopped for 5 minutes every time 11 parts of well flushing are accumulated, the original displacement is increased by 3-5 parts/hour again, and 11 parts of well flushing are performed again, so that pulses are formed in the whole well flushing process.
In one possible design, if the type of the target well is an oil well with serious sand production and scaling of a carbonate oil field oil well, the oil well is frequently stuck after entering a mechanical production period;
the method further comprises the following steps:
and replacing the common tubular pump of the target well with a sand prevention-sand discharge-sand setting integrated long plunger oil well pump.
In one possible design, the sand prevention-sand discharge-sand setting integrated long plunger oil well pump is a three-stage pump gap.
The embodiment of the invention provides a comprehensive treatment method for a collapsed well of a carbonate reservoir, which comprises the steps of firstly determining the type of a target well of the carbonate reservoir; then if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located; and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe. By replacing open hole well completion with supporting sand control screen well completion, the collapse of a shaft of an oil well is prevented, the service life of the oil well is prolonged, the influence on the liquid supply capacity of the oil well due to sand burying at the bottom of a reservoir is avoided, and the productivity of the oil well is improved.
In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features of the technical solutions, other technical problems that can be solved by the method for comprehensively treating a carbonate reservoir collapsed well according to the embodiments of the present invention, other technical features included in the technical solutions, and beneficial effects brought by the technical features will be further described in detail in the detailed description.
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 first schematic flow chart of a comprehensive treatment method for a collapsed well of a carbonate reservoir provided by an embodiment of the invention;
FIG. 2 is a schematic illustration of a completion string supporting a sand screen provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a comprehensive treatment method for a collapsed well of a carbonate reservoir according to an embodiment of the present invention;
FIG. 4 is a third schematic flow chart of the comprehensive treatment method for a collapsed well of a carbonate reservoir provided by the embodiment of the invention;
fig. 5 is a fourth schematic flow chart of the comprehensive treatment method for the collapsed wells of the carbonate reservoir provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, 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.
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.
The first embodiment,
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for comprehensively treating a collapsed well of a carbonate reservoir according to an embodiment of the present invention. As shown in fig. 1, the method includes:
s101: determining the type of the target well of the carbonate reservoir.
In the embodiment of the invention, according to the life cycle of the carbonate oil-gas well, the carbonate reservoir target well is divided into a newly drilled well, an old well completed by an open hole in advance, an oil well suspended in the well for preventing sand or blocked by producing zone sand prevention, and the type of the target well is an oil well in which the oil well is frequently stuck after entering a mechanical production stage due to serious sand production and scaling of the carbonate oil field oil well.
S102: if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; and the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located.
In the embodiment of the invention, the completion mode of open hole completion does not effectively support the production zone; for new well drilling, the technical idea of the integrated mining and drilling technology of reverse design and forward construction is used for preventing the collapse of a shaft, and a supporting sand control screen pipe is arranged in an oil well production zone during well completion.
Wherein, the aperture of the supporting sand control screen pipe is 60 percent of the average grain diameter of the produced sand of the block where the target well is located.
In one embodiment of the invention, the well is bailed for sampling during well operations in the block, a well sand production particle size test is performed, and the determination of the support sand screen aperture is performed by the particle size test. Through repeated simulated formation tests, the aperture size of the supporting sand control screen pipe is 60% of the average grain size of the produced sand of the block. If the aperture is too large, too much stratum sand enters the shaft, which easily causes the shaft to be blocked, collapsed and other complications; if the aperture is too small, the flow resistance is too large, the production capacity of an oil well is influenced, and even the supporting sand control screen pipe is completely blocked, so that the production is stopped.
Referring to fig. 2, fig. 2 is a schematic diagram of a completion string supporting a sand screen according to an embodiment of the present invention. Wherein A is a supporting sand control screen.
S103: and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
In embodiments of the present invention, a breakable formation refers to a formation section where the formation strength is low. For example, wells with producing zones for the wellsite group are sealed to the good section, and wells without producing zones for the wellsite group directly vomit wood shock prone formations.
At present, according to the conditions of sand production and collapse of stratum rocks, sections 1-2 of the good lattice groups and the vomit wood shock are easy-to-collapse strata, the strata are not purposefully well-fixed in the current well completion, so that a large amount of sand production and collapse occur in the later production period of a carbonate rock oil well, the treatment cost is extremely high, and the effect is poor.
Compared with an open hole well completion mode, the suspended support sand control screen pipe well completion method has the advantages that a casing pipe with high strength is adopted to directly support a stratum which is easy to collapse, the sand control screen pipe with the optimal sand control aperture is adopted to prevent sand at a position with a production zone, and the two casing pipes are provided with the casing pipes with the same inner and outer diameter sizes for the convenience of later engineering operation (such as operation of layer changing and the like).
From the above description, embodiments of the present invention first determine the type of the target well of the carbonate reservoir; then if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located; and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe. By replacing open hole well completion with supporting sand control screen well completion, the collapse of a shaft of an oil well is prevented, the service life of the oil well is prolonged, the influence on the liquid supply capacity of the oil well due to sand burying at the bottom of a reservoir is avoided, and the productivity of the oil well is improved.
Example II,
Referring to fig. 3, fig. 3 is a schematic flow chart of a comprehensive treatment method for a collapsed well of a carbonate reservoir according to an embodiment of the present invention. On the basis of the embodiment of fig. 1, when the target well is an old well with an earlier open hole completion, the method is described in detail as follows:
s201: determining the type of the target well of the carbonate reservoir.
S202: if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; and the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located.
S203: and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
In the embodiment of the present invention, the contents of steps S201 to S203 are the same as those of steps S101 to S103, which are not described herein again.
S204: and when the target well is seriously collapsed, replacing a workover rig with a well drilling machine to carry out workover operation on the target well.
Wherein, because the open hole well completion oil well has more serious sand production collapse, the conventional operation method adopts a workover rig to carry out workover operation. However, the workover rig has limited operation capability, and for an ultra-deep and ultra-high pressure oil well of a carbonate reservoir, the tool in the well is often large in hanging and clamping load, so that effective operation cannot be performed, only temporary well completion can be performed, and the productivity of the oil well cannot be effectively recovered. The processing capacity of the drilling machine is stronger than that of a workover rig, the efficiency is high, and a plurality of types of operation can be performed, so the drilling machine is used for workover operation instead of the workover rig.
In one embodiment of the present invention, the performing a workover operation on the target well by using a drilling well instead of a workover rig comprises:
and performing micro sidetrack drilling on the target well by using the drilling well and the original well hole, so that the reservoir opening degree of the target well is increased.
From the above description, it can be known that, because the workover rig cannot realize limited micro-sidetracking, if the drilling rig is used, the original borehole can be directly utilized to perform micro-sidetracking on the target well, so that the reservoir opening degree of the target well is increased, and the maximum production capacity of the oil well is favorably exerted.
Example III,
Referring to fig. 4, fig. 4 is a third schematic flow chart of the comprehensive treatment method for the collapsed wells of the carbonate reservoir according to the embodiment of the present invention. On the basis of the embodiment of fig. 3, when the type of the target well is the type of the target well, namely a suspended sand control or plugged oil well with a production zone sand control in the well, the method is detailed as follows:
s301: determining the type of the target well of the carbonate reservoir.
S302: if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; and the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located.
S303: and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
S304: and when the target well is seriously collapsed, replacing a workover rig with a well drilling machine to carry out workover operation on the target well.
In the embodiment of the present invention, the contents of steps S301 to S304 are the same as the contents of steps S201 to S204, which are not described herein again.
S305: and if the type of the target well is an oil well which is suspended in the well and prevented from sand or blocked by the sand control of a production zone, performing well flushing operation on the target well by adopting an intermediate phase well flushing technology.
In one embodiment of the invention, the mesophase well-flushing technique comprises:
during the well washing operation, the screen pipe is cleaned by changing the displacement to generate hydraulic jet.
In one embodiment of the invention, said varying the displacement comprises:
if the pressure of the well washing pump truck is lower than 5Mpa, the well washing is carried out by adopting the discharge capacity of 20-25 square/hour;
if the pressure of the well washing pump truck is 5-10Mpa, the well washing is carried out by adopting the discharge capacity of 15-20 square/hour;
if the pressure of the well washing pump truck is 10-15MPa, the well washing is carried out by adopting the discharge capacity of 10-15 square/hour;
if the pressure of the well washing pump truck is 15-20MPa, the well washing is carried out by adopting the discharge capacity of 8-10 square/hour;
if the pressure of the well washing pump truck is 20-25MPa, the well washing is carried out by adopting the discharge capacity of 6-8 square/hour;
if the pressure of the well washing pump truck is 25-30MPa, the well washing is carried out by adopting the discharge capacity of 5-7 square/hour;
if the pressure of the well washing pump truck is 30-40MPa, the well washing is carried out by adopting the discharge capacity of 4-5 square/hour;
and if the pressure of the well washing pump truck is more than 40Mpa, adopting the discharge capacity of 3 square/hour to wash the well.
In one embodiment of the invention, the well washing is stopped for 5 minutes every time 11 sides of well washing are accumulated, the original discharge capacity is increased by 3-5 sides/hour again, and the 11 sides of the well are washed again, so that pulses are formed in the whole well washing process.
The conventional well washing technology is ineffective to screen pipe and shaft blockage, the screen pipe can only be replaced by stopping well operation, the mesophase technology is a novel well washing medium technology, the mesophase technology has good solubility to shaft and oil sludge in stratum, and stratum and screen pipe blockage can be effectively solved.
From the above description, the strong solubility of the mesophase is utilized to loosen, fall off, dissolve the plug; in the well washing process, the screen pipe is effectively cleaned by changing the discharge capacity to generate hydraulic jet flow, and an oil well flow passage is dredged.
Example four,
Referring to fig. 5, fig. 5 is a fourth schematic flow chart of the comprehensive treatment method for the collapsed wells of the carbonate reservoir according to the embodiment of the present invention. On the basis of the embodiment of fig. 4, the embodiment of the present invention describes that the type of the target well is a well with frequent pump sticking after entering the mechanical production period if the type of the target well is due to sand production and severe scaling of the carbonate oil field well, and the method is detailed as follows:
s401: determining the type of the target well of the carbonate reservoir.
S402: if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer; and the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located.
S403: and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
S404: and when the target well is seriously collapsed, replacing a workover rig with a well drilling machine to carry out workover operation on the target well.
S405: and if the type of the target well is an oil well which is suspended in the well and prevented from sand or blocked by the sand control of a production zone, performing well flushing operation on the target well by adopting an intermediate phase well flushing technology.
In the embodiment of the present invention, the contents of steps S401 to S405 are the same as the contents of steps S301 to S205, which are not described herein again.
S406: if the type of the target well is an oil well with frequent pump clamping after entering a mechanical production period due to serious sand production and scaling of a carbonate oil field oil well, replacing a common tubular pump of the target well with a sand prevention-sand discharge-sand setting integrated long plunger oil well pump.
In the embodiment of the invention, the sand prevention-sand discharge-sand setting integrated long plunger oil well pump is a three-stage pump gap.
In the mechanical recovery period of the carbonate oil well, because the oil quality of the carbonate oil reservoir is poor, an oil well pump is selected in the selection of a recovery mode, and a large number of practices prove that the electric pump is not suitable for the carbonate, the oil well pump is selected to be an integrated long-plunger sand-prevention oil well pump which is capable of preventing large particles, discharging small particles and provided with a sand settling channel, and the oil well pump is long in plunger length, so that the problem that the plunger is arranged outside a pump cylinder in the operation and static processes is solved, the characteristic that the carbonate oil reservoir is separated from the oil reservoir can be met, the operation time of the oil well pump is improved, and the well shutdown operation times of the oil well are reduced; the oil well pump clearance should select tertiary, and conventional oil well selects oil well pump clearance for use and all is one-level or second grade, and practice proves that the undersized pump clearance is unfavorable for the lubrication between plunger and the pump barrel, causes the card pump easily, and pump clearance one-level or second grade are not applicable to the oil well production characteristic of carbonate oil reservoir, and tertiary pump clearance has better suitability to the carbonate oil reservoir, and life is longer.
From the above description, the sand control and sand discharge pump is used to replace the common pump, the concept of taking prevention as the main in the past is changed into 'discharge' for gear shifting, the aperture of the sand control screen pipe is properly increased, the probability of screen pipe blockage is reduced, and the time rate of an oil well is increased.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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. A comprehensive treatment method for a collapsed well of a carbonate reservoir is characterized by comprising the following steps:
determining the type of a target well of the carbonate reservoir;
if the type of the target well is a new well, when the target well is completed, a supporting sand control screen pipe is put into an oil and gas production layer;
the aperture of the supporting sand control screen pipe is smaller than the average sand production particle size of the block where the target well is located;
and if the supporting sand control screen pipe is positioned in the easily-collapsed stratum, sealing the easily-collapsed stratum by using a sleeve pipe with the same outer diameter as that of the supporting sand control screen pipe.
2. The method of claim 1, wherein the support screen has a pore size that is 60% of the average sand production particle size of the block in which the target well is located.
3. The method of claim 1,
if the type of the target well is an old well completed by open holes in advance; the method further comprises the following steps:
and when the target well is seriously collapsed, replacing a workover rig with a well drilling machine to carry out workover operation on the target well.
4. The method of claim 3, wherein the servicing the target well with the drilling well in place of a workover rig comprises:
and performing micro sidetrack drilling on the target well by using the drilling well and the original well hole, so that the reservoir opening degree of the target well is increased.
5. The method of claim 1,
if the type of the target well is an oil well which is suspended in the well and is prevented from being blocked by sand control or sand control of a production zone; the method further comprises the following steps:
and performing well washing operation on the target well by adopting an intermediate phase well washing technology.
6. The method of claim 5, wherein the mesophase wash technique comprises:
during the well washing operation, the screen pipe is cleaned by changing the displacement to generate hydraulic jet.
7. The method of claim 6, wherein the varying a displacement comprises:
if the pressure of the well washing pump truck is lower than 5Mpa, the well washing is carried out by adopting the discharge capacity of 20-25 square/hour;
if the pressure of the well washing pump truck is 5-10Mpa, the well washing is carried out by adopting the discharge capacity of 15-20 square/hour;
if the pressure of the well washing pump truck is 10-15MPa, the well washing is carried out by adopting the discharge capacity of 10-15 square/hour;
if the pressure of the well washing pump truck is 15-20MPa, the well washing is carried out by adopting the discharge capacity of 8-10 square/hour;
if the pressure of the well washing pump truck is 20-25MPa, the well washing is carried out by adopting the discharge capacity of 6-8 square/hour;
if the pressure of the well washing pump truck is 25-30MPa, the well washing is carried out by adopting the discharge capacity of 5-7 square/hour;
if the pressure of the well washing pump truck is 30-40MPa, the well washing is carried out by adopting the discharge capacity of 4-5 square/hour;
and if the pressure of the well washing pump truck is more than 40Mpa, adopting the discharge capacity of 3 square/hour to wash the well.
8. The method of claim 7, wherein the well flushing is stopped for 5 minutes for every 11 cumulative well flushes, the previous displacement is increased again by 3-5 square/hour, and 11 cumulative well flushes are used to pulse the entire well flushing process.
9. The method of claim 1, wherein if the target well is of a type that is a well with frequent pump sticking after entering a mechanical production phase due to severe sand production and scaling of a carbonate oil field well;
the method further comprises the following steps:
and replacing the common tubular pump of the target well with a sand prevention-sand discharge-sand setting integrated long plunger oil well pump.
10. The method according to claim 9, wherein the sand control-sand discharge-sand setting integrated long plunger oil well pump is a three-stage pump gap.
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