CN217001793U - Oil exploitation well structure for improving reservoir injection and production capacity - Google Patents

Abstract

The utility model provides an oil exploitation well structure for improving the injection and production capacity of a reservoir, which comprises a well body, a sleeve and a sieve tube, wherein the sleeve penetrates through a target stratum, the sleeve is positioned in the well body, the sieve tube is positioned in the sleeve, sieve pores are distributed on the sieve tube, a gravel filling layer is arranged in a gap between the sieve tube and the sleeve, a sand body is filled in the gravel filling layer, and the diameter of sand body particles is larger than that of the sieve pores. The utility model has the beneficial effects that: be equipped with the gravel packing layer between screen pipe and the sleeve pipe of this exploitation well structure, the gravel packing in situ is filled has the sand body that the granularity is greater than the screen pipe aperture, and the gravel packing layer can prevent that the phenomenon of sand from appearing in the target formation, prevents that target formation sand from plugging the screen pipe to extension oil well exploitation life improves oil well life cycle's output.

Description

Oil exploitation well structure for improving reservoir injection and production capacity

Technical Field

The utility model relates to the technical field of petroleum drilling and production engineering, in particular to a petroleum exploitation well structure for improving the injection and production capacity of a reservoir stratum.

Background

In the frequent injection and production process of a reservoir, a production well can cause reservoir blockage due to reservoir sand production and particle migration, the major problems of oil well sand production (solid impurities/particles are carried into the production well in the oil infiltration process) can cause serious abrasion of underground equipment and ground equipment, even possibly cause sand blocking, and in addition, the workload of ground clearing and sand washing pump detection can be greatly increased. On one hand, attention needs to be paid to ensure the exploitation condition of an oil layer of the oil well, the selection of well completion and well cementation modes is correctly carried out, a reasonable injection and exploitation mode is made, a reasonable production pressure difference is controlled, and the seepage speed is limited; on the other hand, corresponding sand prevention measures are also needed to be adopted according to the related mining processes and the characteristics of oil reservoirs, so that the normal mining of the oil well and the safety of the oil well are further guaranteed.

The sand control modes commonly used at present are two modes of chemical agent sand control and gravel pack sand control, but the chemical agent sand control and gravel pack sand control also have many problems: firstly, because the chemical sand consolidation agent is generally an oil-soluble resin chemical product, the water resistance of the resin is poor, the consolidation strength is low in a water phase, sand control and stabilization can only slow down formation sand production in an anhydrous oil extraction period or a low water-containing period with low scouring strength, and the formation sand production cannot be slowed down in a high water-containing period; secondly, the chemical agent has high viscosity, and is diluted by an organic solvent and then injected into a stratum in the actual use process, so that the organic solvent can bring the problems of safety, environmental protection and the like; thirdly, because the chemical sand consolidation agent and the curing agent are in quick contact reaction and are difficult to be uniformly mixed in the stratum, multiple sections of plugs are required to be separately injected during field construction, the construction period is long, and meanwhile, the strength of a sand body after consolidation is not high, and the sand consolidation effect is not good; fourthly, although the gravel filling well completion mode can protect the reservoir from being damaged by cement slurry and effectively prevent the formation sand from moving, the gravel filling well completion method has the advantages of good sand control effect, long service life and the like, but the gravel filling process has certain defects: in the long horizontal well section, due to the fact that gravel is settled and stacked in the filling process, a filling opening is prone to being blocked, so that the filling between a screen pipe and a well wall is not compact, high-efficiency filling cannot be achieved, and finally sand prevention failure is caused; when the semi-submersible platform is used, the semi-submersible platform is influenced by heave, and during gravel packing operation, a packing tool can move and be dislocated, so that sealing failure is caused, or a packing hole is dislocated, so that the gravel packing operation fails. The gravel packing sand control operation is complex in use process, and the sand control pipe column in the well is complex in post treatment and high in cost.

Therefore, it is necessary to provide a new oil production well structure capable of overcoming the above disadvantages, preventing sand, improving the injection and production capacity of the oil well, prolonging the production life of the oil well, and improving the production yield of the oil well in the whole life cycle.

SUMMERY OF THE UTILITY MODEL

In view of this, in order to solve the defects of the existing sand control technology, improve the sand control success rate, prolong the oil well production life, and improve the production yield of the oil well in the whole life cycle, the utility model provides an oil production well structure for improving the reservoir injection and production capacity, which comprises a well body, a sleeve pipe and a screen pipe, wherein the screen pipe penetrates through the target stratum, the sleeve pipe is positioned in the well body and tightly attached to the inner wall of the well body, overflow holes are distributed on the pipe wall at the lower end of the sleeve pipe, the screen pipe is positioned in the sleeve pipe, screen holes are distributed on the screen pipe, a gravel filling layer is arranged in a gap between the screen pipe and the sleeve pipe, sand bodies are filled in the gravel filling layer, the diameter of sand body particles is larger than that of the screen holes, and the gravel filling layer is used for filtering the oil in the target stratum which penetrates into the screen pipe.

Furthermore, a pipe plug is arranged at the bottom of the sieve pipe and seals the lower end of the sieve pipe.

Furthermore, the outer wall of the sieve tube is provided with a plurality of annular suspension centralizers, the inner walls of the suspension centralizers are connected to the sieve tube, the outer walls of the suspension centralizers are tightly tensioned on the inner wall of the casing, and the suspension centralizers are used for suspending the sieve tube in the casing and enabling the sieve tube and the casing to be coaxially arranged.

Further, the screen pipe with still be equipped with an annular plugging device between the sleeve pipe, the plugging device is located gravel packing layer upper end, and seals gravel packing layer.

Furthermore, the inlet of the well body is also provided with a well cementation layer which is positioned on the outer side of the upper end of the casing.

Further, the range of the gap between the screen pipe and the casing pipe is 20-200mm, and the distance between the bottom of the screen pipe and the bottom of the well body is 0.5-5 m.

The petroleum exploitation well structure for improving the injection and exploitation capacity of the reservoir has the beneficial effects that: be equipped with the gravel packing layer between screen pipe and the sleeve pipe of this exploitation well structure, the gravel packing in situ is filled has the sand body that the granularity is greater than the screen pipe aperture, and the gravel packing layer can prevent that the phenomenon of sand from appearing in the target formation, prevents that target formation sand from plugging the screen pipe to extension oil well exploitation life improves oil well life cycle's output.

Drawings

FIG. 1 is a schematic diagram of a petroleum recovery well configuration for enhanced reservoir stimulation in accordance with an embodiment of the present invention.

In the figure: 1-well body, 11-well cementing layer, 2-casing pipe, 21-suspension centralizer, 3-screen pipe, 31-pipe plug, 4-target stratum, 5-plugging device and 6-gravel packing layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

The utility model relates to an oil exploitation well structure for improving the injection and production capacity of a reservoir, which comprises a well body 1, a casing 2, a screen pipe 3 and a blowout preventer 5.

The well body 1 is formed by drilling through a drilling machine device, the lower end of the well body 1 extends to a target stratum 4, the target stratum is an oil storage layer, the casing 2 is located in the well body 1, the outer wall of the casing 2 is attached to the well wall of the well body 1, overflow holes are distributed in the pipe wall of the lower end of the casing 2, the casing 2 is used for preventing the well wall of the middle lower part of the well body 1 from collapsing, and larger stones in the target stratum 4 are prevented from falling into the casing 2, and the casing 2 is blocked.

The sieve tube 3 is positioned in the casing 2, a gap with a certain width is formed between the outer wall of the sieve tube 3 and the inner wall of the casing 2, the width range of the gap is 20-202mm, the distance between the bottom of the sieve tube 3 and the bottom of the well body 1 (namely the lower end part of the casing 2) is 0.5-5m, and in the embodiment, the distance between the bottom of the sieve tube 3 and the bottom of the well body 1 is 3 m. The bottom of the sieve tube 3 is provided with a pipe plug 31, the pipe plug 31 seals the bottom of the sieve tube 3, the upper end and the lower end of the sieve tube 3 are respectively positioned above and below the target stratum 4 (the sieve tube penetrates through the whole target stratum 4), sieve holes are fully distributed on the sieve tube 3, and the aperture of each sieve hole is smaller than that of an overflow hole on the sleeve.

The outer wall of the sieve tube 3 is provided with a plurality of annular suspension centralizers 21, the inner walls of the suspension centralizers 21 are connected to the sieve tube 3, the outer wall of each suspension centralizer 21 is suspended on the inner wall of the casing 2 through frictional resistance, and the suspension centralizers 21 are used for suspending the sieve tube 3 in the casing 2 and enabling the sieve tube 3 and the casing 2 to keep coaxial.

The sand body is filled to 1 part of the well body that is equipped with in the clearance between screen pipe 3 and the sleeve pipe 2 and below screen pipe 3, the sand body forms gravel packing layer 6, and the particle diameter of the sand body is greater than in gravel packing layer 6 the sieve mesh diameter of screen pipe 3 can prevent like this that the sand body from infiltrating into screen pipe 3 in the gravel packing layer 6, leads to the shutoff of screen pipe 3, gravel packing layer 6 top still is equipped with a plugging device 5, plugging device 5 is ring shape, plugging device 5 is used for the shutoff gravel packing layer, prevents that the sand body in gravel packing layer 6 from upwards moving along with well liquid when the oil extraction. The gravel packing layer 6 can prevent solid impurities in the target stratum 4 from entering the sieve tube 3, and has a filtering effect on petroleum flowing into the sieve tube 3, and the gravel packing layer 6 has a sand prevention effect on the target stratum 4, so that the exploitation life of the well body 1 is prolonged, and the full-period petroleum exploitation amount of the well body 1 is improved.

Further, the well head of well body 1 goes out and still is equipped with well cementation layer 11, well cementation layer 11 is located the outside of sleeve pipe 2 upper end, well cementation layer 11 is formed by concrete placement, well cementation layer 11 is used for improving the well head intensity that prevents well body 1, prevents that the well head from collapsing to other devices (sleeve pipe 2, well sealing device, beam-pumping unit all etc.) for the well head provide the support.

The working process of the petroleum exploitation well structure for improving the injection and exploitation capacity of the reservoir comprises the following steps:

s1: drilling a well body 1 by a drilling machine, enabling the well body 1 to penetrate through a target stratum 4, installing a well cementation layer 11, a casing 2, a sieve tube 3 and a suspension centralizer 21, and enabling the sieve tube 3 to penetrate through the target stratum and be coaxially fixed in the casing 2;

s2: selecting sand bodies with proper density and granularity, filling the sand bodies into a gap between the sieve tube 2 and the sleeve 3, flushing the sand bodies to the bottom of the well body 1 through sand carrying liquid, stacking the sand bodies to form a gravel packing layer 6, and installing a plugging device 5 after the gravel packing layer 6 is formed so as to plug the upper end of the gravel packing layer 6; the gravel packing layer 6 has a filtering effect on the petroleum flowing into the sieve tube 3, so that the sand production phenomenon of the target stratum 4 is prevented;

s3: installing an oil well pump at the upper end of a well mouth of the well body 1, extending the lower end of the oil well pump into the sieve tube 3, starting the oil well pump, pumping oil penetrating into the sieve tube 3, after primary exploitation lasts for a period of time, gradually reducing the flow of the oil penetrating into the sieve tube 3, closing the oil well pump after the flow of the oil pumped by the oil well pump is reduced to a certain value, and stopping pumping oil;

s4: the plugging device 5 is taken out, high-pressure compaction liquid is continuously poured into the well body, sand bodies of the gravel packing layer are flushed out, and the petroleum permeation resistance is reduced;

s6: and starting the oil pumping unit to carry out secondary exploitation on the oil in the well body.

By adopting the oil production well structure, the problem that the sand is produced in the oil infiltration process of the target stratum 4 can be prevented, the production period of the production well can be effectively prolonged, and the production quantity of the whole life cycle of the production well is improved.

In this document, the terms front, back, upper, lower and the like in the drawings are used for the sake of clarity and convenience only for the components are located in the drawings and the positions of the components relative to each other. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims (6)

1. A petroleum exploitation well structure for improving the injection and exploitation capability of a reservoir is characterized in that: including the well body, sleeve pipe and screen pipe, the screen pipe passes target stratum, the sleeve pipe is located the well body, and pastes the inner wall of the tight well body, the pipe wall distribution of sleeve pipe lower extreme has the overflow hole, the screen pipe is located in the sleeve pipe, it has the sieve mesh to distribute on the screen pipe, the screen pipe with be equipped with the grit filling layer in the clearance between the sleeve pipe, the packing of grit filling layer has the sand body, the diameter of sand body granule is greater than the diameter of sieve mesh, the grit filling layer is used for filtering the oil in the infiltration screen pipe in the target stratum.

2. A petroleum recovery well structure for enhancing the injectivity of a reservoir as defined in claim 1, wherein: and the bottom of the sieve tube is provided with a pipe plug which seals the lower end of the sieve tube.

3. A petroleum recovery well structure to enhance the injectivity of a reservoir according to claim 1, wherein: the sieve tube is characterized in that a plurality of annular suspension centralizers are arranged on the outer wall of the sieve tube, the inner walls of the suspension centralizers are connected to the sieve tube, the outer walls of the suspension centralizers are tightly tensioned on the inner wall of the casing, and the suspension centralizers are used for suspending the sieve tube in the casing and enabling the sieve tube and the casing to be coaxially arranged.

4. A petroleum recovery well structure to enhance the injectivity of a reservoir according to claim 1, wherein: the screen pipe with still be equipped with an annular plugging device between the sleeve pipe, the plugging device is located gravel packing layer upper end, and seals gravel packing layer.

5. A petroleum recovery well structure to enhance the injectivity of a reservoir according to claim 1, wherein: and the inlet of the well body is also provided with a well cementation layer which is positioned on the outer side of the upper end of the sleeve.

6. A petroleum recovery well structure to enhance the injectivity of a reservoir according to claim 1, wherein: the range of the gap between the sieve tube and the casing is 20-200mm, and the distance between the bottom of the sieve tube and the bottom of the well body is 0.5-5 m.

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