CN111827920B - Layered gas channeling plugging process for fireflooding production well - Google Patents

Layered gas channeling plugging process for fireflooding production well Download PDF

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Publication number
CN111827920B
CN111827920B CN201910322591.7A CN201910322591A CN111827920B CN 111827920 B CN111827920 B CN 111827920B CN 201910322591 A CN201910322591 A CN 201910322591A CN 111827920 B CN111827920 B CN 111827920B
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production well
gas channeling
diameter
packer
connecting sleeve
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CN111827920A (en
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郭洪军
吴非
罗恩勇
许丹
匡旭光
向峥
王岩
王磊
董鹏毅
张志中
史旭东
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Petrochina Co Ltd
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Petrochina Co Ltd
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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
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • 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
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243—Combustion in situ
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/04—Hulls, shells or bark containing well drilling or treatment fluids

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Pipe Accessories (AREA)

Abstract

The invention provides a layered gas channeling plugging process for a fireflooding production well, which comprises the following steps: (1) After the layered gas channeling plugging pipe column of the fire flooding production well is lowered to a designed position, a certain amount of gel composition is injected into an oil layer from an oil pipe; (2) Then injecting a certain amount of high-strength gel particles from the oil pipe; (3) And (4) injecting an inorganic sealing agent to seal the channeling system, and replacing with clean water and replacing with excessive clean water. The layered gas channeling plugging process for the fireflooding production well and the used tubular column solve the problems of unsatisfactory plugging effect, complex construction process, long construction time, high operation cost and the like in the prior art, can effectively reduce the operation process and cost, and improve the measure effect and the production time rate.

Description

Layered gas channeling plugging process for fireflooding production well
Technical Field
The invention relates to a layered gas channeling plugging process for a fireflooding production well, and belongs to the technical field of oil extraction engineering.
Background
With the continuous deepening of the fire flooding development, the inconsistency of the power consumption in the thin and interbedded thick oil fire flooding development process is obvious due to the influence of a plurality of factors such as large interlayer difference, uneven plane development and uneven power consumption in the traditional steam development process. Once the fire line forms a one-way intrusion, the fire flooding well group is seriously influenced. In order to improve the utilization degree of a low-permeability layer, prevent a fire line from protruding in a single direction and improve the overall development effect of a fireflood well group, a gas channeling plugging technical test of a fireflood production well is developed on site. As this technology is implemented, a number of problems are exposed. Firstly, the plugging agent has poor performance and short plugging effective period, and influences the periodic yield of the measure well. Because the Du 66 fireflood is a top system fireflood, a part of plugging agent enters a lower system in a general injection mode during construction, the plugging agent which really enters a target layer can be reduced, the plugging and channeling validity period is short, and the plugging agent which enters the lower system can reduce daily liquid production and daily oil production of a measure well. Secondly, after the layered sand filling is adopted for injection, an oil layer is easily buried by sand after construction. Because the upper layer is fire-driven, the lower layer is filled with sand during construction, and the upper layer is independently plugged. Although the effect of filling the lower layer system with sand is good, the construction time is long, and the filled sand cannot be flushed out after the construction, so that 60% of oil well sand is buried in an oil layer. In addition, the injection operation cost is high by adopting a general injection or layered sand filling mode. When the injection is carried out by adopting the cage system, residual medicament can be accumulated in a shaft after construction, and sand washing is needed. When the layered sand filling injection is adopted, extra sand filling cost is needed, and sand washing is carried out after the construction, so that the operation cost is greatly increased.
Disclosure of Invention
In order to solve the defects and shortcomings, the invention aims to provide a layered gas channeling plugging process for a fireflood production well. The invention provides a layered gas channeling plugging process for a fireflood production well, aiming at the problems of layered plugging adjustment of the conventional fireflood production well, and the process and the used pipe column solve the problems of unsatisfactory plugging effect, complex construction process, long construction time, high operation cost and the like in the prior art, can effectively reduce the operation process and cost, and improve the measure effect and the production time rate.
In order to achieve the above object, the present invention provides a layered gas channeling plugging process for a fireflood production well, wherein the layered gas channeling plugging process for the fireflood production well utilizes a layered gas channeling plugging tubular column of the fireflood production well, and the process comprises:
(1) After the layered gas channeling plugging pipe column of the fireflood production well is lowered to a designed position, a certain amount of gel composition is injected into an oil layer from an oil pipe;
(2) Then injecting a certain amount of high-strength gel particles from the oil pipe;
(3) And (4) injecting an inorganic sealing agent to seal the channeling system, replacing with the clean water, and replacing with the excessive clean water.
According to the specific embodiment of the invention, the layered gas channeling plugging process for the fireflood production well specifically comprises the following steps:
(1) After the layered gas channeling plugging pipe column of the fire flooding production well is lowered to the designed position, 200-300m of gas is injected into an oil layer from an oil pipe 3 The gel composition of (1);
(2) Then injecting 300-500m from the oil pipe 3 The high strength gel particles of (a);
(3) Injecting at 60-150m 3 The inorganic sealing agent is used for sealing channeling system and then replaces 20-30m 3 The clear water.
According to the specific embodiment of the invention, in the fireflood production well layered gas channeling plugging process, preferably, the gel composition comprises 0.2 to 0.5wt% of polyacrylamide, 1.5 to 2.0wt% of an organic crosslinking agent, 0.4 to 0.6wt% of a heat stabilizer and 0.08 to 0.1wt% of thiourea, based on the total weight of the gel composition being 100%.
According to a specific embodiment of the invention, in the fireflood production well stratified gas channeling plugging process, the gel composition preferably has a pH value of 6-8.
According to a specific embodiment of the invention, in the fireflood production well stratified gas channeling plugging process, preferably, the organic crosslinking agent comprises formaldehyde.
According to a specific embodiment of the invention, in the fireflood production well stratified gas channeling plugging process, preferably, the heat stabilizer comprises phenol.
Wherein, the mixed phenol is a conventional substance, and the main component of the mixed phenol is phenol.
According to the specific embodiment of the invention, in the fireflood production well layered gas channeling plugging process, the high-strength gel particles preferably comprise 0.3-0.5wt% of polyacrylamide, 0.1-0.2wt% of urotropin (hexamethylenetetramine), 0.01-0.02wt% of resorcinol, 1-4wt% of plant fiber particles and 0.08-0.1wt% of ammonium chloride, wherein the total weight of the high-strength gel particles is 100%.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, preferably, the plant fiber particles comprise rice hull powder and bark powder.
According to the specific embodiment of the invention, in the fireflood production well stratified gas channeling plugging process, the diameter of the high-strength gel particles is preferably 0.5-2mm.
According to the specific embodiment of the invention, in the layered gas channeling blocking process of the fireflooding production well, the inorganic sealing agent preferably comprises 5-10wt% of soil powder, 15-20wt% of mineral powder and 0.008-0.01wt% of sodium hydroxide based on 100% of the total weight of the inorganic sealing agent.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, the plant fibers are added into the high-strength gel particles, so that the high-strength gel particles can play a role in filling and compacting a large pore canal; the gel composition (gel system) used comprises polyacrylamide, an organic cross-linking agent (such as formaldehyde) and a heat stabilizer (mixed phenol); wherein the polyacrylamide and the organic cross-linking agent can form high-strength gel within a certain time.
In the specific embodiment of the invention, the dosage ranges of polyacrylamide, formaldehyde, thiourea and phenol mixture are set in consideration of the gel strength, the ground viscosity of the plugging agent (the plugging agent is required to have better pumpability during construction), the cost of the plugging agent and other factors; in addition, experiments also prove that the gelling time and the gelling strength of the plugging agent can be effectively adjusted by changing the concentrations of polyacrylamide (partially hydrolyzed polyacrylamide), formaldehyde and the like or adjusting the pH value of the gel composition on the premise of meeting the strength requirement.
In a word, the plugging agent formula used by the invention compositely applies the particle and gel system and optimizes the performance of the particle and gel system, so that the plugging agent has better fluidity, can easily reach the deep part of the stratum and increases the plugging strength.
According to the specific embodiment of the invention, in the process for blocking the layered gas channeling of the fireflood production well, preferably, the layered gas channeling blocking tubular column of the fireflood production well sequentially comprises the following components from top to bottom:
the system comprises a pressure release valve, a throttle valve, an expansion type small-diameter K344 packer and a check valve;
the pressure relief valve and the throttle valve are sequentially arranged on the first oil pipe from top to bottom;
the upper joint of the expansion type small-diameter K344 packer is connected with a first oil pipe through an internal thread at the upper part of the expansion type small-diameter K344 packer; the lower joint of the expanding small-diameter K344 packer is connected with a second oil pipe through the lower internal thread of the expanding small-diameter K344 packer;
the check valve is connected to the bottom end of the second oil pipe below the expansion small-diameter K344 packer through threads.
According to a specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, preferably, the expandable small-diameter K344 packer comprises an upper joint, an upper connecting sleeve, a central pipe, an upper outer shield, a sealing rubber sleeve, a lower outer shield, a lower connecting sleeve and a lower joint;
the upper joint is connected with the external thread at the upper end of the central pipe through the internal thread at the lower part of the upper joint; the upper joint is connected with the internal thread of the upper connecting sleeve through the external thread at the lower end of the upper joint; the upper outer shield is connected with the external thread of the upper connecting sleeve through the internal thread at the upper end of the upper outer shield;
the central pipe is connected with the lower joint through external threads at the lower end of the central pipe; the lower joint is connected with the internal thread of the lower connecting sleeve through the external thread at the upper end of the lower joint; the lower outer protective cover is connected with the external thread of the lower connecting sleeve through the internal thread at the lower end of the lower outer protective cover;
a plurality of liquid inlet holes are formed in the side wall of the lower end of the central pipe;
the upper end and the lower end of the sealing rubber cylinder are respectively cast with an upper steel part and a lower steel part with threads, and the upper steel part of the sealing rubber cylinder is connected with the lower internal threads of the upper outer shield through the threads; the lower steel part of the sealing rubber cylinder is connected with the upper internal thread of the lower outer shield through the thread of the lower steel part.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, the liquid inlet hole (used for enabling the pressurizing liquid to enter the gap annular space between the central pipe and the sealing rubber cylinder and enabling the sealing rubber cylinder of the packer to expand until sealing) of the expansion type small-diameter K344 packer is arranged on the side wall of the lower end of the central pipe, and the structure can ensure that the liquid enters the lower end of the packer to form a bending backflow state in the liquid inlet process.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, preferably, the expandable small-diameter K344 packer further comprises a first rubber ring and a second rubber ring; the first rubber ring and the second rubber ring are respectively sleeved at the lower end of the upper connecting sleeve and the upper end of the lower connecting sleeve, so that sealing between the upper connecting sleeve and the upper outer shield and sealing between the lower connecting sleeve and the lower outer shield are realized.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, preferably, the expandable small-diameter K344 packer further comprises a third rubber ring and a fourth rubber ring; the third rubber ring and the fourth rubber ring are respectively sleeved at the lower end of the upper joint and the upper end of the lower joint, so that sealing between the upper joint and the upper connecting sleeve and sealing between the lower joint and the lower connecting sleeve are realized.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, the expandable small-diameter K344 packer further comprises a first valve cover and a second valve cover, wherein the second valve cover is sleeved on the side wall of the bottom end of the central pipe and is positioned below the liquid inlet hole; the first valve cover is sleeved on the side wall of the top end of the central pipe. The first valve cover and the second valve cover are used for fixing and sealing the top end and the bottom end of the central tube and the sealing rubber cylinder.
According to the specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, preferably, the expanded small-diameter K344 packer further comprises a first limit ring and a second limit ring; the first limiting ring and the second limiting ring are respectively sleeved at the upper end and the lower end of the sealing rubber tube and are positioned in threaded connection between the upper end and the lower end of the sealing rubber tube and the upper outer protective cover and between the upper end and the lower end of the sealing rubber tube and the lower outer protective cover respectively, and the first limiting ring and the second limiting ring are used for realizing extrusion fixation between the upper end and the lower end of the sealing rubber tube and the upper outer protective cover and between the upper outer protective cover and the lower outer protective cover respectively.
According to the specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, the number of the liquid inlet holes is preferably 2-4. The distribution of the liquid inlet holes is not specifically required, and technicians in the field can reasonably arrange the liquid inlet holes on the side wall of the lower end of the central pipe according to the requirements of field operation.
According to the specific embodiment of the invention, in the process for plugging the layered gas channeling of the fireflood production well, the diameter of the liquid inlet hole is preferably 8-10mm.
According to the specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, preferably, the sealant barrel sequentially comprises an inner container, a line layer, an outer layer, a cross-linking layer and a skin layer from inside to outside; the crosslinked layer is used to bond the outer layer and the skin layer.
According to the specific embodiment of the invention, in the fireflood production well layered gas channeling plugging process, the skin layer is preferably made of high-hardness wear-resistant rubber.
Wherein, the cortex is the cortex of the wear-resisting rubber material (the conventional material in this field) of high rigidity, and it is on the basis of having kept the expansibility and the resilience of original packing element, and the leakproofness is unchangeable, and the bulging deformation reduces during the seat seal, and compressive property and wear resistance improve.
According to the specific embodiment of the invention, in the layered gas channeling blocking process for the fireflood production well, preferably, the crosslinked layer is a butadiene-acrylonitrile rubber layer.
According to the specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, the liner, the line layer and the outer layer are respectively prepared from conventional materials in the field; and the skilled person can select suitable materials for preparing the liner, the wire layer and the outer layer according to the needs of field operation as long as the aim of the invention can be achieved.
According to the specific embodiment of the invention, in the fire flooding production well layered gas channeling blocking process, the thickness of the sealant cylinder is preferably 18-22mm.
According to the specific embodiment of the invention, in the fireflood production well stratified gas channeling plugging process, the maximum outer diameter of the expanding small-diameter K344 packer is preferably less than 140mm.
According to the specific embodiment of the invention, in order to ensure the safety performance of the tubular column, the maximum outer diameter of the expansion type small-diameter K344 packer is preferably set to be less than 140mm, and the outer diameter of the expansion type small-diameter K344 packer can be reduced as much as possible on the premise of ensuring the sealing and pressure-bearing performance.
The maximum outer diameter refers to the diameter of the outer shield, namely the outer diameter of the thickest part of the expandable small-diameter K344 packer.
According to the specific embodiment of the invention, in the fireflooding production well stratified gas channeling plugging process, the maximum outer diameter of the expanding small-diameter K344 packer is preferably 135mm.
According to the specific embodiment of the invention, in the layered gas channeling plugging process for the fireflood production well, preferably, the upper ends of the upper joint, the upper connecting sleeve and the upper outer shield, and the lower ends of the lower outer shield, the lower connecting sleeve and the lower joint have large chamfer structures.
According to the specific embodiment of the invention, in the layered gas channeling plugging process of the fireflood production well, the angle of the chamfer is preferably 45-60 degrees.
The invention designs an expansion type small-diameter K344 packer, the outer diameter of the packer is reduced to 135mm on the premise of ensuring the sealing performance, the difference between the outer diameter of the packer and the inner diameter of a sleeve is 26.7mm, the gap between the packer and the sleeve is enlarged, meanwhile, the end parts of large-size components exposed outside, such as the upper end parts of an upper joint, an upper connecting sleeve and an upper outer protecting cover, and the lower end parts of a lower outer protecting cover, a lower connecting sleeve and a lower joint are designed by large chamfers (the chamfer angle is 45-60 degrees), the risk of pipe column clamping caused by accumulation of a blocking agent is prevented, and the packer is suitable for requirements of layered gas channeling blocking. The packer provided by the invention has the working modes of differential pressure setting and pressure relief deblocking, and has reliable sealing and deblocking performances. In the layered plugging process, the plugging agent can be ensured to effectively enter a target layer, and the plugging agent is prevented from being extruded and leaking. And when the plugging agent is injected, clean water is injected instead, the residual plugging agent in the pipe is extruded into an oil layer, excessive replacement is carried out, liquid enters the oil pipe through the check valve, the oil sleeve is balanced at the moment, the K344 packer is unsealed, the oil sleeve is communicated, and the residual plugging agent in the shaft is removed, so that the stacking and solidification of the plugging agent are avoided. Simultaneously with the design of the biggest external diameter of K344 packer for 135mm, compare traditional K344 packer external diameter and reduce 15mm, and bearing capacity can reach more than 25MPa, both satisfied the sealed pressure-bearing requirement of packer, also increaseed packer and sleeve pipe clearance, the stifled agent of being convenient for is washed, has effectively prevented that the stifled agent from piling up the solidification annular space between packer and sleeve pipe, avoids the operation to play the tubular column and pulls out the risk of motionless.
According to the specific embodiment of the invention, in the layered gas channeling plugging tubular column of the fireflood production well, the main function of the pressure release valve is to open the pressure release valve to release the pressure of a liquid column of an oil pipe by a ball injector when the expandable small-diameter K344 packer is not unsealed, force the packer to unseal, simultaneously release liquid of the oil pipe and prevent the liquid in the pipe from gushing out to cause pollution when the tubular column is lifted.
According to the specific embodiment of the invention, in the layered gas channeling blocking tubular column of the fireflood production well, the check valve is used for sealing by seating a positive pressure steel ball on the ball seat in the oil pipe during construction, and when construction is completed and reversed, liquid under the pressure can enter the oil pipe from the lower part of the check valve, so that the residual plugging agent in the pipe is flushed, the pressure of the oil sleeve is balanced, and the packer is unsealed.
According to a particular embodiment of the invention, the "upper" refers to a direction away from the inside of the well and the "lower" refers to a direction towards the inside of the well.
In conventional K344 packers used in the art, the inlet passage is obtained as a slit in the base pipe, typically 0.1-0.2mm wide, to prevent frac sand from entering the tool interior. But the slotting structure easily causes the incomplete packer deblocking under the condition that thick oil is in wax precipitation, namely the slotting is blocked, and the rubber cylinder is difficult to drain. Therefore, the expanding small-diameter K344 packer provided by the invention does not cut a slot on the central pipe, but a plurality of liquid inlet holes are formed in the side wall of the lower end of the central pipe, so that liquid can enter through the lower end of the packer to form a bending reflux state in the liquid inlet process, sand can be effectively prevented, the area of the flow passage is large, and the possibility that the flow passage is blocked by wax deposition of thick oil is effectively reduced.
According to the specific embodiment of the invention, in the expandable small-diameter K344 packer, the connection parts of the upper outer shield, the lower outer shield and the sealing rubber sleeve are fixedly connected, so that the excessive expansion of the sealing rubber sleeve during setting is reduced; the diameters of the upper outer shield and the lower outer shield at the shoulder part of the sealing rubber cylinder are larger than the diameter of the sealing rubber cylinder, so that the sealing rubber cylinder can be protected, and the scratch to the sealing rubber cylinder in the process of going into the well is reduced. In addition, the limiting ring is arranged, so that the excessive expansion of the sealing rubber cylinder during seat sealing can be further reduced.
According to the specific embodiment of the invention, in the expandable small-diameter K344 packer, the structures of the upper joint and the lower joint can be the same or different.
According to the layered gas channeling plugging process for the fireflooding production well, provided by the invention, after the layered gas channeling plugging tubular column of the fireflooding production well is lowered to a designed position, a certain gel composition is injected firstly (injected from an oil pipe and enters an oil layer through a throttle valve), and the gel composition is in a viscous jelly shape, so that a gap between an expanded small-diameter K344 packer for compacting the layered gas channeling plugging tubular column of the fireflooding production well and the inner wall of a casing is filled, and the situation that plant particles (high-strength gel particles) injected subsequently are accumulated at the position to prevent the situation that the load is too high and the plugging tubular column cannot be pulled out is avoided. After a certain amount of gel composition is injected, high-strength gel particles are injected, and finally, an inorganic sealing agent channeling sealing system is injected, and then excessive clear water is replaced.
The layered gas channeling plugging process for the fireflood production well provided by the invention improves the measure pertinence, enables the plugging agent to effectively enter a target layer, reduces the using amount of the plugging agent, reduces the measure cost, improves the longitudinal utilization degree of the fireflood gas injection well, and improves the fireflood development effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an expanding small diameter K344 packer provided in an embodiment of the invention;
fig. 2 is a schematic structural diagram of a layered gas channeling blocking tubular column for a fireflood production well according to an embodiment of the present invention.
The main reference numbers illustrate:
1. an upper joint;
2. an upper connecting sleeve;
3. a central tube;
4. an upper outer shield;
5. sealing the rubber cylinder;
6. a first limit ring;
7. a lower outer shield;
8. a second rubber ring;
9. a second valve cover;
10. a lower connecting sleeve;
11. a lower joint;
12. a first rubber ring;
13. a second stop collar;
14. a third rubber ring;
15. a fourth rubber ring;
16. a pressure relief valve;
17. a throttle valve;
18. an expanded minor diameter K344 packer;
19. a check valve;
20. a first oil pipe;
21. a second oil pipe.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides an expandable small-diameter K344 packer, which is schematically shown in fig. 1, and as can be seen from fig. 1, the expandable small-diameter K344 packer comprises:
the sealing device comprises an upper joint 1, an upper connecting sleeve 2, a central pipe 3, an upper outer shield 4, a sealing rubber cylinder 5, a first limiting ring 6, a second limiting ring 13, a lower outer shield 7, a first rubber ring 12, a second rubber ring 8, a first valve cover, a second valve cover 9, a lower connecting sleeve 10, a lower joint 11, a third rubber ring 14 and a fourth rubber ring 15;
the upper joint 1 is connected with the upper end external thread of the central pipe 3 through the lower internal thread; the upper joint 1 is connected with the internal thread of the upper connecting sleeve 2 through the external thread at the lower end of the upper joint; the upper outer shield 4 is connected with the external thread of the upper connecting sleeve 2 through the internal thread at the upper end of the upper outer shield;
the central tube 3 is connected with the lower joint 11 through the external thread at the lower end of the central tube; the lower joint 11 is connected with the internal thread of the lower connecting sleeve 10 through the external thread at the upper end thereof; the lower outer shield 7 is connected with the external thread of the lower connecting sleeve 10 through the internal thread at the lower end of the lower outer shield;
a plurality of liquid inlet holes are formed on the side wall of the lower end of the central pipe 3;
the upper end and the lower end of the sealing rubber cylinder 5 are respectively cast with an upper steel part and a lower steel part with threads, and the upper steel part of the sealing rubber cylinder 5 is connected with the lower internal threads of the upper outer shield 4 through the threads; the lower steel part of the sealing rubber cylinder 5 is connected with the upper internal thread of the lower outer shield 7 through the thread;
the first rubber ring 12 and the second rubber ring 8 are respectively sleeved at the lower end of the upper connecting sleeve 2 and the upper end of the lower connecting sleeve 10, so as to realize the sealing between the upper connecting sleeve 2 and the upper outer shield 4 and between the lower connecting sleeve 10 and the lower outer shield 7;
the third rubber ring 14 and the fourth rubber ring 15 are respectively sleeved at the lower end of the upper joint 1 and the upper end of the lower joint 11, so as to realize the sealing between the upper joint 1 and the upper connecting sleeve 2 and between the lower joint 11 and the lower connecting sleeve 10;
the first limiting ring 6 and the second limiting ring 13 are respectively sleeved at the upper end and the lower end of the sealing rubber cylinder 5 and are positioned in the threaded connection between the upper end and the lower end of the sealing rubber cylinder 5 and the upper outer shield 4 and the lower outer shield 7 respectively;
the second valve cover 9 is sleeved on the side wall of the bottom end of the central tube 3 and is positioned below the liquid inlet hole; the first valve cover (not shown in the figure) is sleeved on the top side wall of the central tube 3;
in the embodiment, the number of the liquid inlet holes is 4;
in the embodiment, the diameter of the liquid inlet hole is 10mm;
in this embodiment, the sealant barrel 5 sequentially includes an inner container, a wire layer, an outer layer, a cross-linking layer and a skin layer from inside to outside; the cross-linked layer is used for cementing the outer layer and the skin layer;
the skin layer is made of high-hardness wear-resistant rubber;
the crosslinking layer is a butadiene-acrylonitrile rubber layer;
the thickness of the sealing rubber cylinder 5 is 20mm;
in this embodiment, the maximum outer diameter of the expandable small-diameter K344 packer is 135mm;
in this embodiment, the upper ends of the upper joint 1, the upper connecting sleeve 2 and the upper outer shield 4, and the lower ends of the lower outer shield 7, the lower connecting sleeve 10 and the lower joint 11 all have large chamfer structures; the angle of the chamfer is 60 degrees.
In this embodiment, the upper joint 1, the upper connecting sleeve 2, the upper outer shield 4, the first limiting ring 6, the second limiting ring 13, the lower outer shield 7, the first valve cover, the second valve cover 9, the lower connecting sleeve 10, the lower joint 11 and the like are all made of 45 steel; the first rubber ring 12, the second rubber ring 8, the third rubber ring 14 and the fourth rubber ring 15 are made of nitrile rubber.
Example 2
The embodiment provides a layered gas channeling blocking tubular column for a fireflood production well, which is shown in fig. 2, and as can be seen from fig. 2, the layered gas channeling blocking tubular column for the fireflood production well comprises:
a pressure relief valve 16, a throttle valve 17, the expandable small-diameter K344 packer 18 and a check valve 19 provided in example 1;
the pressure relief valve 16 and the throttle valve 17 are sequentially arranged on the first oil pipe 20 from top to bottom;
the upper joint 1 of the expanding small-diameter K344 packer 18 is connected with a first oil pipe 20 through the internal threads on the upper part of the upper joint; the lower sub 11 of the expandable small diameter K344 packer 18 is connected with a second tubing 21 by its lower internal thread;
the check valve 19 is threaded into the bottom end of the second tubing 21 below the expanded small diameter K344 packer 18.
Example 3
The embodiment provides a layered gas channeling plugging process for a fireflood production well, wherein the layered gas channeling plugging process for the fireflood production well utilizes the layered gas channeling plugging tubular column for the fireflood production well provided in the embodiment 2, and the process comprises the following steps of:
the layered gas channeling plugging tubular column of the fireflood production well provided by the embodiment 2 of the invention is lowered to a designed position, after a well mouth is installed, a cement truck is used on the ground to inject water into an oil pipe for pressurizing, under the throttling action of a throttle valve, an oil sleeve forms pressure difference, a sealing rubber sleeve of the expansion type small-diameter K344 packer expands to be attached to the wall of a sleeve to seal the annular space of the oil sleeve, and setting is completed.
Injecting a certain amount (200-300 m) from oil pipe to oil layer 3 ) The gel composition is viscous jelly, so that the gel composition is used for filling a gap between the expansion type small-diameter K344 packer of the layered gas channeling blocking pipe column of the compacted fireflood production well and the inner wall of the casing pipe, so as to prevent plant particles injected subsequently from accumulating at the part and causing too high load and unmovable in pipe lifting;
wherein, the gel composition comprises 0.3wt% of polyacrylamide, 1.5wt% of formaldehyde, 0.5wt% of mixed phenol and 0.1wt% of thiourea, based on 100% of the total weight of the gel composition;
the mixed phenol is a conventional substance, and the main component of the mixed phenol is phenol;
then injecting 300-500m from the oil pipe 3 The high strength gel particles of (a);
wherein the high-strength gel particles comprise 0.5wt% of polyacrylamide, 0.15wt% of urotropin, 0.02wt% of resorcinol, 3wt% of plant fiber particles and 0.08wt% of ammonium chloride, wherein the total weight of the high-strength gel particles is 100%;
then the injection is carried out for 60 to 150m 3 The inorganic sealing agent sealing channeling system;
wherein the inorganic sealing agent comprises 8wt% of soil powder, 20wt% of mineral powder and 0.01wt% of sodium hydroxide, based on the total weight of the inorganic sealing agent as 100%.
When all the medicines are injected, the clear water is injected to extrude the residual medicines in the tube into the oil layer, and then the residual medicines are excessive (20-30 m) 3 ) Replacing clear water, enabling the clear water to enter an oil pipe through a check valve, balancing an oil sleeve at the moment, unsealing the expansion type small-diameter K344 packer, communicating the oil sleeve, removing residual medicaments, and taking out the profile control pipe column;
if the expanding small-diameter K344 packer is not unpacked or liquid exists in the pipe, the pressure release valve can be opened by throwing balls at a well head, the liquid in the pipe is discharged, and the liquid is prevented from being gushed out to cause pollution.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.

Claims (18)

1. A layered gas channeling plugging process for a fireflood production well is characterized in that a layered gas channeling plugging tubular column of the fireflood production well is utilized in the layered gas channeling plugging process, and the process comprises the following steps:
(1) After the layered gas channeling plugging pipe column of the fire flooding production well is lowered to a designed position, a certain amount of gel composition is injected into an oil layer from an oil pipe; the gel composition comprises 0.2 to 0.5 weight percent of polyacrylamide, 1.5 to 2.0 weight percent of organic cross-linking agent, 0.4 to 0.6 weight percent of heat stabilizer and 0.08 to 0.1wt percent of thiourea, wherein the total weight of the gel composition is 100 percent;
wherein, fireflood production well layering gas channeling shutoff tubular column includes from the top down in proper order:
the device comprises a pressure release valve (16), a throttle valve (17), an expansion type small-diameter K344 packer (18) and a check valve (19);
the pressure relief valve (16) and the throttle valve (17) are sequentially arranged on the first oil pipe (20) from top to bottom;
the upper joint (1) of the expanding small-diameter K344 packer (18) is connected with a first oil pipe (20) through an internal thread at the upper part of the upper joint; the lower joint (11) of the expanding small-diameter K344 packer (18) is connected with a second oil pipe (21) through the lower internal thread of the expanding small-diameter K344 packer;
the check valve (19) is connected to the bottom end of a second oil pipe (21) below the expanding small-diameter K344 packer (18) through screw threads;
the expanding type small-diameter K344 packer (18) comprises an upper joint (1), an upper connecting sleeve (2), a central pipe (3), an upper outer shield (4), a sealing rubber sleeve (5), a lower outer shield (7), a lower connecting sleeve (10) and a lower joint (11);
the upper joint (1) is connected with the external thread at the upper end of the central pipe (3) through the internal thread at the lower part of the upper joint; the upper joint (1) is connected with the internal thread of the upper connecting sleeve (2) through the external thread at the lower end of the upper joint; the upper outer shield (4) is connected with the external thread of the upper connecting sleeve (2) through the internal thread at the upper end of the upper outer shield;
the central pipe (3) is connected with the lower joint (11) through external threads at the lower end of the central pipe; the lower joint (11) is connected with the internal thread of the lower connecting sleeve (10) through the external thread at the upper end of the lower joint; the lower outer shield (7) is connected with the external thread of the lower connecting sleeve (10) through the internal thread at the lower end of the lower outer shield;
a plurality of liquid inlet holes are formed in the side wall of the lower end of the central pipe (3);
the upper end and the lower end of the sealing rubber cylinder (5) are respectively cast with an upper steel part and a lower steel part with threads, and the upper steel part of the sealing rubber cylinder (5) is connected with the lower internal threads of the upper outer shield (4) through the threads; the lower steel part of the sealing rubber cylinder (5) is connected with the internal thread at the upper end of the lower outer protective cover (7) through the thread;
the maximum outer diameter of the expansion type small-diameter K344 packer is smaller than 140mm;
the upper end of the upper joint (1), the upper connecting sleeve (2) and the upper outer shield (4) and the lower end parts of the lower outer shield (7), the lower connecting sleeve (10) and the lower joint (11) are all provided with large chamfer structures, and the angles of the chamfers range from 45 to 60 degrees o ；
(2) Then injecting a certain amount of high-strength gel particles from the oil pipe; wherein, the high-strength gel particles comprise 0.3 to 0.5 weight percent of polyacrylamide, 0.1 to 0.2 weight percent of urotropin, 0.01 to 0.02 weight percent of resorcinol, 1 to 4 weight percent of plant fiber particles and 0.08 to 0.1wt percent of ammonium chloride, wherein the total weight of the high-strength gel particles is 100 percent;
(3) Injecting an inorganic sealing agent to seal the channeling system, and replacing with clean water and replacing with excessive clean water; wherein, the inorganic sealing agent comprises 5-10wt% of soil powder, 15-20wt% of mineral powder and 0.008-0.01wt% of sodium hydroxide, wherein the total weight of the inorganic sealing agent is 100%.
2. The layered gas channeling plugging process for the fireflood production well according to claim 1, characterized by comprising the following steps:
(1) After the layered gas channeling plugging pipe column of the fire flooding production well is lowered to the designed position, 200-300m of gas is injected into an oil layer from an oil pipe 3 The gel composition of (1);
(2) Then injecting 300-500m from the oil pipe 3 The high strength gel particles of (a);
(3) Injection 60-150m 3 The inorganic sealing agent is used for sealing channeling system and then replaces 20-30m 3 The clear water of (1).
3. The process for plugging layered gas channeling from a fireflood production well according to claim 1, wherein the gel composition has a pH of 6 to 8.
4. The fireflood production well stratified gas channeling plugging process of claim 1, wherein the organic cross-linking agent comprises formaldehyde.
5. The fireflood production well stratified gas channeling plugging process of claim 1, wherein said thermal stabilizer comprises phenol-blending.
6. The layered gas channeling plugging process for fireflood production well according to claim 1, wherein the plant fiber particles comprise rice hull powder and bark powder.
7. The fireflood production well stratified gas channeling plugging process according to claim 1 or 2, wherein the diameter of the high strength gel particles is 0.5-2mm.
8. The layered gas channeling plugging process for fireflood production well according to claim 1, wherein the expanding small-diameter K344 packer further comprises a first rubber ring (12), a second rubber ring (8); the first rubber ring (12) and the second rubber ring (8) are respectively sleeved at the lower end of the upper connecting sleeve (2) and the upper end of the lower connecting sleeve (10) to realize sealing between the upper connecting sleeve (2) and the upper outer shield (4) and sealing between the lower connecting sleeve (10) and the lower outer shield (7).
9. The layered gas channeling plugging process for fireflood production well according to claim 1, wherein the expanding small-diameter K344 packer further comprises a third rubber ring (14), a fourth rubber ring (15); the third rubber ring (14) and the fourth rubber ring (15) are respectively sleeved at the lower end of the upper joint (1) and the upper end of the lower joint (11) to realize sealing between the upper joint (1) and the upper connecting sleeve (2) and between the lower joint (11) and the lower connecting sleeve (10).
10. The layered gas channeling plugging process for fireflood production well according to claim 1, wherein the expanded small-diameter K344 packer further comprises a first valve cover and a second valve cover (9), wherein the second valve cover (9) is sleeved on the bottom end side wall of the central pipe (3) and is positioned below the liquid inlet hole; the first valve cover is sleeved on the side wall of the top end of the central pipe (3).
11. The layered gas channeling plugging process for fireflooding production well according to claim 1, wherein the expanded small-diameter K344 packer further comprises a first stop collar (6) and a second stop collar (13); the first limiting ring (6) and the second limiting ring (13) are respectively sleeved at the upper end and the lower end of the sealing rubber cylinder (5) and are positioned in threaded connection between the upper end and the lower end of the sealing rubber cylinder (5) and the upper outer shield (4) and the lower outer shield (7) respectively.
12. The layered gas channeling plugging process for fireflood production well according to any one of claims 1,8-11, wherein the number of the liquid inlet holes is 2-4.
13. The fireflood production well stratified gas channeling plugging process of any one of claims 1,8-11, wherein the diameter of said liquid inlet hole is 8-10mm.
14. The fireflood production well layered gas channeling plugging process according to any one of claims 1,8-11, wherein said packing rubber (5) comprises an inner liner, a wire layer, an outer layer, a cross-linked layer and a skin layer in sequence from inside to outside; the crosslinked layer is used to bond the outer layer and the skin layer.
15. The fireflood production well stratified gas channeling plugging process according to claim 14, wherein the skin layer is a high hardness wear-resistant rubber material.
16. The fireflood production well layered gas channeling plugging process according to claim 14, wherein the cross-linked layer is a layer of nitrile rubber.
17. The fireflood production well stratified gas channeling plugging process according to claim 14, wherein the thickness of said packing rubber cylinder (5) is 18-22mm.
18. The fireflood production well zonal gas channeling plugging process of any one of claims 1,8-11, wherein said expanded small diameter K344 packer has a maximum outer diameter of 135mm.
CN201910322591.7A 2019-04-22 2019-04-22 Layered gas channeling plugging process for fireflooding production well Active CN111827920B (en)

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