CN110671086B - Composite acid fracturing construction pipe column and application method - Google Patents
Composite acid fracturing construction pipe column and application method Download PDFInfo
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- CN110671086B CN110671086B CN201810704873.9A CN201810704873A CN110671086B CN 110671086 B CN110671086 B CN 110671086B CN 201810704873 A CN201810704873 A CN 201810704873A CN 110671086 B CN110671086 B CN 110671086B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/112—Perforators with extendable perforating members, e.g. actuated by fluid means
Abstract
The invention provides a composite acid fracturing construction pipe column and an application method thereof, and belongs to the technical field of underground fracturing operation processes. The composite acid fracturing construction pipe column comprises at least one spray gun with a sliding sleeve, a slotted pipe and a hollow guide head; the spray guns with the sliding sleeves are connected in sequence; the lower end of the last spray gun with the sliding sleeve is connected with the upper end of the slotted pipe; the lower end of the slit pipe is connected with the hollow guide head. The invention realizes the sectional modification of different construction modes such as large-scale acid fracturing, fixed-point jet perforation, jet fracturing and the like on a long open hole section by one string, improves the layering and sectional modification effects of the clastic rock of the oil field, improves the swept volume and the complexity of the modified crack of the clastic rock reservoir and improves the fracturing yield-increasing effect. The invention does not need mechanical packing, has simple pipe column structure and high tool reliability and safety, meets different functional requirements, has good construction continuity, saves construction time, reduces construction cost and improves the development effect of oil fields.
Description
Technical Field
The invention belongs to the technical field of underground fracturing operation processes, and particularly relates to a composite acid fracturing construction pipe column and an application method thereof, which are suitable for various well type reconstruction measure operations of clastic rock, such as various vertical wells, horizontal wells, open-hole wells, cased wells and the like.
Background
The deep carbonate rock matrix of the Tahe oil field is compact and low in grade, but small-scale natural cracks and karst caves relatively develop, and large-scale acid fracturing is adopted in the development process to communicate with a developing dessert area. The well type mainly comprises a directional well and a horizontal well, the production well section is completed in an open hole mode, most open hole well sections are longer, the conventional open hole well section mainly adopts the general acid fracturing, the long-well-section open hole general acid fracturing is easy to cause excessive modification of a reservoir development layer section, the modification effect of the layer section with poor reservoir development is poor, and the development effect is influenced; part of wells adopt a fiber temporary plugging and subsection acid fracturing process, the transformation effect can be improved, but the problems of high fiber cost and slightly poor field construction operability exist.
Chinese patent publication CN105756647A discloses a fracturing method for a multi-stage and multi-cluster fracturing string with a stationary string, which is characterized in that a multi-stage and multi-cluster multi-stage spray gun is connected in the string, after the ball is thrown into the stationary string, a plurality of sliding sleeves are opened by increasing the discharge capacity, so that the multiple increase of the treatment interval is realized, and the requirements of staged fracturing modification operation of a well with a large number of operation stages and a long horizontal section are met. Chinese patent publication CN 103266875B discloses a fracturing working method of a multistage hydraulic jet staged fracturing string, and the invention can realize hydraulic jet and fracturing combined construction of 6 sections or more than 6 sections by connecting a multistage jet packing tool in the string and dragging the string in one drilling. The construction speed can be greatly accelerated, and the construction time is saved. The document ' development and application of a horizontal well hydraulic jetting annulus sanding high-strength dragging fracturing tool ' (drilling and production process 2017(5)) discloses a high-strength fracturing tool for a horizontal well annulus sanding dragging volume fracturing technology, and the tubular column can realize simultaneous injection of an oil pipe and an oil sleeve annulus and can meet the injection requirement of large displacement of 8m '/min. The document 'development and application of horizontal well hydraulic jet multistage fracturing tools' (petroleum machinery 2013(12)) discloses a horizontal well hydraulic jet multistage fracturing string which comprises a safety joint, an inner sliding sleeve injector, a sliding sleeve-free injector, a check valve assembly and the like.
However, the existing hydraulic jet fracturing string construction method can not meet the requirements of staged modification operation of different construction modes such as large-scale acid fracturing and fixed-point jet fracturing of deep wells and long open-hole well sections of oil fields.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a composite acid fracturing construction tubular column and an application method thereof, so that the staged acid fracturing operation of different construction modes such as large-scale acid fracturing, fixed-point jet perforation, jet fracturing and the like can be completed on a long open hole section by one tubular column, the layering and staged reconstruction effects of clastic rock in a Tahe oil field are greatly improved, the swept volume and the complexity of the clastic rock reservoir reconstruction cracks are improved, and the fracturing yield-increasing effect is improved. The invention does not need mechanical packing, and has simple pipe column structure, high tool reliability and safety.
The invention is realized by the following technical scheme:
a composite acid fracturing construction pipe column comprises at least one spray gun with a sliding sleeve, a slotted pipe and a hollow guide head;
the spray guns with the sliding sleeves are connected in sequence; the lower end of the last spray gun with the sliding sleeve is connected with the upper end of the slotted pipe;
the lower end of the slit pipe is connected with the hollow guide head;
the composite acid fracturing construction pipe column comprises an oil pipe and a safety joint;
the oil pipe is connected with the upper end of the safety joint, and the lower end of the safety joint is connected with the upper end of the first spray gun with the sliding sleeve;
and a centralizer is arranged at the upper end of the first spray gun with the sliding sleeve.
The inner diameters of the spray guns with the sliding sleeves are different, and from the first spray gun with the sliding sleeve to the last spray gun with the sliding sleeve, the inner diameters of the spray guns with the sliding sleeves are reduced in sequence. Namely, the inner diameter of the spray gun with the sliding sleeve connected with the safety joint is the largest, the inner diameter of the spray gun with the sliding sleeve connected with the slotting tube is the smallest, and the middle inner diameter is reduced in sequence.
Each spray gun with sliding sleeve all includes: the spray gun comprises a spray gun body, a spray gun sliding sleeve and a spray gun sliding sleeve seat;
the spray gun body is of a cylindrical structure, and a central through hole coaxial with the spray gun body is formed in the spray gun body; the wall of the spray gun body is provided with a nozzle mounting hole, and the nozzle mounting hole is used for communicating a central through hole of the spray gun body with the outside of the spray gun body; a nozzle is arranged in the nozzle mounting hole;
the spray gun sliding sleeve is arranged in a central through hole of the spray gun body; the lower end of the spray gun sliding sleeve is fixed on the spray gun body through shear pins, and at the moment, the spray gun sliding sleeve blocks each spray nozzle; the upper end of the spray gun sliding sleeve is provided with a sliding sleeve sealing step which is used for being matched with the sealing ball;
the lower end of the spray gun body is connected with the upper end of the spray gun sliding sleeve seat;
a central through hole coaxial with the spray gun sliding sleeve seat is formed in the spray gun sliding sleeve seat, and a step is arranged on the inner wall of the middle part of the central through hole; when the spray gun sliding sleeve moves downwards into the central through hole of the spray gun sliding sleeve seat, the lower end of the spray gun sliding sleeve is propped against the step, and the spray nozzle is opened at the moment.
The slotted pipe is a hollow pipe, and the wall of the slotted pipe is thicker than that of the oil pipe;
a plurality of slits parallel to the central axis of the slotted pipe are arranged on the pipe wall of the slotted pipe;
the hollow guide head is of a cylindrical structure, and a central through hole coaxial with the hollow guide head is formed in the hollow guide head; the central through hole comprises a large-diameter section and a small-diameter section which are sequentially connected; the diameter of the small diameter section is smaller than that of the large diameter section.
A centralizer is arranged outside each spray gun sliding sleeve seat;
oil pipe threads are arranged at the upper end of each spray gun body and the lower end of the spray gun sliding sleeve seat;
oil pipe threads are arranged at the two ends of the oil pipe, the two ends of the safety joint and the two ends of the slotted pipe;
and oil pipe threads are arranged on the inner wall of the large-diameter section.
The application method of the composite acid fracturing construction pipe column adopts a pipe column to complete multi-layer acid fracturing and jet perforation fracturing construction of an open hole well; the method comprises the following steps:
firstly, determining the number of spray guns with sliding sleeves, the arrangement mode of nozzles on each spray gun with sliding sleeves, the number of nozzles and the size of the nozzles according to the number of reconstruction sections, the property of construction sections and the optimization result of crack parameters; assembling the composite acid fracturing construction pipe column according to the number of the reconstruction intervals and the depth position requirement of each interval, and then putting all the pipe columns into a well;
secondly, correcting the depth of the pipe column, adjusting the depth of the composite acid fracturing construction pipe column according to the depth correction result, aligning each spray gun with a sliding sleeve to the corresponding construction target layer section, then connecting an oil pipe hanger, sitting on a wellhead four-way, and then installing a fracturing wellhead;
thirdly, construction preparation before fracturing is carried out;
and fourthly, constructing the first construction layer section: the nozzles of the spray guns with the sliding sleeves are not opened, and construction liquid enters the stratum through the central through hole of the hollow guide head and the seam on the slotted pipe to construct a first construction layer section; then isolating the first construction layer section;
and fifthly, constructing each construction layer section in the middle: and sequentially carrying out the following operations from the last spray gun with the sliding sleeve to the second spray gun with the sliding sleeve: throwing a sealing ball from a wellhead, opening a nozzle of the spray gun with the sliding sleeve, and constructing a construction layer section corresponding to the spray gun with the sliding sleeve; then isolating the construction layer section; the diameters of the added sealing balls are sequentially increased;
and sixthly, performing construction of the last construction layer section: throwing a sealing ball from a wellhead, opening a first nozzle with a sliding sleeve spray gun, and constructing the last construction layer section; replacing slippery water in the later construction period; closing the well and measuring the pressure drop after the construction is finished; after pressure measurement and reduction are finished, opening the well according to design requirements, and carrying out open flow and test on the original tubular column to obtain yield; during blowout, all the sealing balls are discharged out of the ground along with the liquid;
and step seven, determining whether the pipe column is lifted or the original pipe column is produced according to the test production result.
The fourth step is that the construction of the first construction layer section adopts large-scale acid fracturing reconstruction construction;
in the fifth step, the construction of the construction layer section corresponding to the spray gun with the sliding sleeve is carried out, and in the sixth step, the construction of the last construction layer section is carried out by adopting the following steps: carrying out jet perforation and acid fracturing reconstruction construction or jet perforation and sand fracturing reconstruction construction or acid fracturing reconstruction construction;
the operation of the injection perforation and acid fracturing reconstruction construction comprises the following steps:
injecting acid liquor into an oil pipe, injecting foam active water or acidic slickwater from an annular space, carrying out non-uniform mixing on the two liquids at an outlet of the nozzle to form non-uniform mixed acid liquor, and carrying out non-uniform etching modification on the stratum by the non-uniform mixed acid liquor after the two liquids enter the stratum to form a high diversion crack;
the foam active water adopts the following components: nitrogen foam active water, carbon dioxide foam active water or air foam active water; preferably: nitrogen foam activated water;
the ratio of the annular displacement to the tubing displacement is between 0.2 and 2, preferably between 0.3 and 1.5, and more preferably: 0.5-0.8.
The operation of isolating the first construction interval in the fourth step comprises: adopting over-displacement operation, wherein the displacement amount is the volume V of the current section of the shaft and is added by 5-10 square;
firstly, injecting 3-5 square slick water from an oil pipe, and then injecting temporary plugging jelly from the oil pipe for replacement, wherein the temporary plugging jelly isolates a first construction layer section;
the operation of isolating the construction interval in the fifth step comprises: adopting over-displacement operation, wherein the displacement amount is that the volume V of the current section of the shaft is added by 5-10 square;
firstly, injecting 3-5 square slickwater from an oil pipe, then injecting temporary plugging gel from the oil pipe for replacement, injecting slickwater from the annulus for replacement, and isolating the construction interval.
The operation of throwing the sealing ball from the wellhead in the fifth step, opening the nozzle of the spray gun with the sliding sleeve, and the operation of throwing the sealing ball from the wellhead in the sixth step all comprise:
throwing a sealing ball from a wellhead, wherein the sealing ball falls into a sliding sleeve sealing step with a sliding sleeve spray gun, and the sealing ball is sealed with the sliding sleeve sealing step; the oil pipe is pressed, the shear pin is cut off, the sealing ball moves downwards along with the spray gun sliding sleeve to enter the spray gun sliding sleeve seat and is propped against the step in the spray gun sliding sleeve seat, and at the moment, the nozzle is opened.
Compared with the prior art, the invention has the beneficial effects that:
by designing the composite acid fracturing construction pipe column and the application method, the invention can realize that the sectional modification of different construction modes such as large-scale acid fracturing, fixed-point jet perforation, jet fracturing and the like can be successively completed on a long open hole section by one pipe column, greatly improves the layering and sectional modification effects of the clastic rock of the oil field, improves the swept volume and the complexity of the modified crack of the clastic rock reservoir and greatly improves the fracturing yield-increasing effect. The invention does not need mechanical packing, has simple pipe column structure and high tool reliability and safety, meets different functional requirements, has good construction continuity, saves construction time, reduces construction cost and improves the development effect of oil fields.
Drawings
FIG. 1 is a schematic diagram of a composite acid fracturing construction pipe column structure according to the present invention
Wherein: 1. oil pipe, 2. safety joint, 3. spray gun with sliding sleeve, 4. spray gun with sliding sleeve, 5. centralizer, 6. slotted pipe, 7. hollow guide head
FIG. 2 is a schematic view of a hollow guide head
FIG. 3 is a schematic view of a slotted tube structure
FIG. 4 is a schematic view of a spray gun with a sliding sleeve
Wherein: 1. spray gun main body, 2. nozzle, 3. sliding sleeve, 4. shear pin, 5. sliding sleeve seat, 6. centralizer
FIG. 5 is a schematic view of a sliding sleeve well-entry state structure
Fig. 6 is a schematic structural view of the sliding sleeve in an open state.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the invention relates to a composite acid fracturing construction pipe column and an application method thereof, which are suitable for the sectional modification construction operation of various well types such as various vertical wells, horizontal wells, open-hole wells, cased wells and the like of clastic rock. According to the invention, by improving the optimized configuration and application method of the construction pipe column structure, the sectional modification of different acid fracturing modes such as large-scale acid fracturing, fixed-point jet perforation, jet fracturing and the like on a long open hole section by one construction pipe column is realized, the layering and sectional modification effects of the clastic rock of the tower river oil field are improved, the swept volume and the complexity of the modified crack of the clastic rock reservoir are improved, the construction cost is reduced, and the fracturing yield-increasing effect is improved.
As shown in figure 1, the pipe column combination mainly comprises an oil pipe 1, a safety joint 2, a spray gun with a sliding sleeve 3, a spray gun with a sliding sleeve 4, a centralizer 5, a slotted pipe 6 and a hollow guide head 7. The oil pipe 1, the safety joint 2, the spray gun with the sliding sleeve 3, the spray gun with the sliding sleeve 4, the centralizer 5, the slotted pipe 6 and the hollow guide head 7 are connected through oil pipe threads (except the hollow guide head 7, oil pipe threads are arranged at two ends of other parts, and two adjacent parts are connected through the oil pipe threads).
The structure of the spray gun with the sliding sleeve 3 is the same as that of the spray gun with the sliding sleeve 4, but the inner diameters of the spray guns are different, and the inner diameters of the spray gun with the sliding sleeve 4 and the spray gun with the sliding sleeve 3 are sequentially increased.
The structures of the spray guns 3 and 4 with the sliding sleeves are shown in figure 4 and comprise; a lance body 401, a nozzle 402, a lance slide 403, a shear pin 404, a lance slide receptacle 405, and a centralizer 406.
The spray gun body 401 is of a cylindrical structure, a central through hole coaxial with the spray gun body is formed in the spray gun body, a nozzle mounting hole is formed in the wall of the spray gun body, and the central through hole of the spray gun body is communicated with the outside of the spray gun body through the nozzle mounting hole; a nozzle 402 is installed in the nozzle installation hole;
a spray gun sliding sleeve 403 is arranged in a central through hole of the spray gun body, the lower end of the spray gun sliding sleeve is fixed on the spray gun body through a shear pin 404, and each spray nozzle is blocked by the spray gun sliding sleeve 403; the upper end of the spray gun sliding sleeve 403 is provided with a sliding sleeve sealing step which is used for being matched with a sealing ball.
The lower end of the spray gun body 401 is connected with a spray gun sliding sleeve seat 405, a central through hole coaxial with the spray gun sliding sleeve seat is formed in the spray gun sliding sleeve seat, a step is arranged on the inner wall of the middle of the central through hole, when the spray gun sliding sleeve 403 moves downwards into the central through hole of the spray gun sliding sleeve seat 405, the lower end of the spray gun sliding sleeve 403 is propped by the step, and a spray nozzle of a spray gun is exposed at the moment.
A centralizer 406 is mounted on the exterior of the lance slide housing 405.
In actual use, the arrangement mode of the nozzles 402, the number of the arranged nozzles and the size of the nozzles are configured according to the property of the construction interval and the optimization result of the crack parameters; the nozzle arrangement, number of nozzles and nozzle size of each sliding sleeve lance are generally different, but may be the same, as each lance is individually tailored according to the nature of the construction interval and the fracture parameter optimization results.
The structure of the hollow guide head 7 is a cylindrical structure as shown in fig. 2, a central through hole coaxial with the hollow guide head is formed in the hollow guide head, the central through hole comprises a large-diameter section and a small-diameter section which are sequentially connected, the diameter of the small-diameter section is smaller than that of the large-diameter section, and an oil pipe thread is arranged on the inner wall of the large-diameter section.
The structure of the slotted pipe is shown in figure 3, and the slotted pipe is a section of hollow pipe, the pipe wall of the hollow pipe is thicker than that of the oil pipe, a plurality of slots parallel to the axis of the hollow pipe are arranged on the pipe wall, and oil pipe threads are processed at two end parts of the hollow pipe and are used for connecting parts at two ends. The slotted pipe is used for fluid passing during large-displacement construction so as to reduce construction friction resistance.
The construction pipe column is connected into the well according to the design sequence on the ground according to the construction requirements, the pipe column is lowered to the position near the design depth, then the pipe column depth correction is carried out, the pipe column depth is adjusted according to the depth correction result to be consistent with the design requirements, and then the well mouth device required by construction is installed.
The construction process of the invention is as follows:
firstly, assembling the construction pipe column shown in figure 1 according to the requirements of the position of the layer section for construction and reconstruction, and then putting the construction pipe column into a well. The sliding sleeve in the lance with sliding sleeve is not opened at this time, as shown in fig. 5. According to the requirement of the layer section position of construction transformation, assembling the construction pipe column means that the number of the spray guns is designed according to the requirement, for example, when only two sections are constructed, the pipe column comprises an oil pipe 1, a safety joint 2, a spray gun 4 with a sliding sleeve, a centralizer 5, a slotted pipe 6 and a guide head 7; when three sections of the pipe column are constructed, the pipe column comprises an oil pipe 1, a safety joint 2, a spray gun 3 with a sliding sleeve, a spray gun 4 with a sliding sleeve, a centralizer 5, a slotted pipe 6 and a guide head 7, and the number of the spray guns is increased along with the number of the sections. The nozzle arrangement mode, the number of nozzles and the size of the nozzles of each section of spray gun are individually customized according to the property of the construction layer section and the crack parameter optimization result.
And secondly, correcting the depth of the tubular column, adjusting the tubular column according to the depth correction result, aligning a tubular column spray gun to the target interval, and then loading the fracturing wellhead. The oil pipe 1 is a tubing string representing the whole entering well, the depth correction and adjustment length of the tubing string entering the well meets the design requirements, then the whole tubing string is connected with a tubing hanger, the tubing hanger is seated on a four-way joint of the well head, and then the fracturing well head is installed.
And thirdly, performing construction preparation before fracturing.
And fourthly, performing large-scale acid fracturing reconstruction construction on the first section, wherein the composite acid fracturing construction pipe column is equivalent to a common smooth oil pipe column, and construction liquid enters the stratum through the central through hole of the guide head and the seam on the slotted pipe in the step. And (4) driving temporary plugging jelly with a designed volume to isolate the construction section at the end of the displacement stage in the later stage of fracturing.
And fifthly, throwing a ball at the wellhead for the first time, enabling the sealing ball to fall into a sliding sleeve 403 with a sliding sleeve spray gun 4, pressing the oil pipe to break a shear pin 404, enabling the sliding sleeve 403 to move downwards to enter a sliding sleeve seat (as shown in figure 6), simultaneously exposing a spray gun nozzle, and then performing jet perforation and acid fracturing reconstruction on a second section. At the moment, acid liquor is injected into the oil pipe, foam active water or acidic slickwater is injected into the annular space, the two liquids are non-uniformly mixed at the outlet of the nozzle and enter the stratum together, and the stratum can be non-uniformly etched to form a high-flow-guide crack.
And sixthly, performing wellhead ball injection again, wherein the ball is slightly larger than the ball injected for the first time, the sealing ball falls into a sliding sleeve with a sliding sleeve spray gun 3, an oil pipe is pressed to break a shear pin, the sliding sleeve moves downwards to enter a sliding sleeve seat, a spray gun nozzle is exposed, and then performing injection perforation and acid fracturing reconstruction construction on a third section. At the moment, according to design requirements, sand-containing liquid is injected into the oil pipe, fracturing fluid base fluid is injected into the annular space, injection fracturing transformation is carried out on a target layer, and well shut-in pressure drop is measured after construction is finished.
And seventhly, after pressure measurement and pressure reduction are finished, opening the well according to design requirements, carrying out open flow (namely open flow through 3, 4 and 6) on the original tubular column, and testing and obtaining yield, wherein all the sealing balls are discharged out of the ground along with liquid during the open flow.
And step eight, determining whether the pipe column is lifted or the original pipe column is produced according to the test production result.
After each section of construction is finished, temporary plugging jelly is injected to seal the constructed section, and after the whole well construction is finished, the jelly is automatically dissolved, broken and discharged, so that the mechanical sealing is not performed through a packer.
The invention has the following characteristics:
(1) the pipe column can complete large-scale acid fracturing construction, acid fracturing injection and fracturing injection transformation in one trip.
(2) The composite acid fracturing segmented reconstruction can be carried out on the long open hole section by one trip of pipe column.
(3) The composite acid fracturing construction pipe column can be used for carrying out non-uniform etching acid fracturing process by injecting liquid such as oil pipe acid and foam active water into annulus.
(4) The composite acid fracturing construction pipe column can be used for testing and production of original pipe columns after construction.
The detailed implementation steps of the method are as follows:
(1) evaluation of key reservoir parameters
The method comprises the longitudinal and transverse distribution characteristics, lithology, whole rock mineral components, physical properties, rock mechanical parameters, three-dimensional ground stress characteristics, fracture-cave development characteristics, temperature and pressure and the like of a reservoir. The method can be comprehensively applied to earthquake, well logging, well testing, core indoor testing of pilot hole wells and the like.
(2) Completion mode and partial pressure interval determination
For carbonate rock, an open hole completion mode is generally adopted to improve the contact area between a borehole and an oil and gas reservoir to the maximum extent, and meanwhile, the stability of the borehole is not influenced. Under the condition of open hole well completion, the general construction mode is only a general acidification or acid fracturing mode, while the method of the invention is adopted to determine a main target zone, hydraulic jet acid fracturing or sand fracturing can be carried out on the second-class and third-class zones, and on the basis of the step (1), measures are determined to modify the number of the zones, generally 2-4 zones.
(3) Oil and gas reservoir geological model establishment and production history fitting
On the basis of the step (2), a fine geological model, particularly the identification and fine depiction of a slot and hole system, is established by applying common geological modeling software PETROL. If the well is produced or tested, historical fitting of yield or pressure and the like can be carried out by using production or test data, and therefore information of stratum key parameters such as effective permeability, skin coefficient and the like of each construction interval is determined.
(4) Optimization of fracture parameter system
And (3) introducing the geological model parameters into common carbonate rock acid fracturing yield prediction simulation software ECLIPSE, and then setting artificial fractures and natural fracture systems with different modified intervals according to an equivalent flow conductivity method. And then, simulating different acid-etched half-seam lengths, fracture flow conductivity, seam spacing and post-pressing yield dynamics of the fractures in different distribution modes according to an orthogonal design method, and preferably selecting the optimal fracture parameters of each modified interval.
(5) Optimization of acid fracturing construction parameters
In order to realize the optimized fracture parameters of each interval in the step (4), common commercial simulation software for acid fracturing design, such as STIMPLAN, Fracpro PT and the like, is used for simulating the acid-etched fracture length, the flow conductivity and the like under different acid fracturing construction parameters, and the optimal acid fracturing construction parameter combination of each modified interval is preferably selected.
The above (1) to (5) are preliminary works for customizing the arrangement of the nozzles of the spray gun, the number of the nozzles, and the size of the nozzles according to the optimization results.
The following (6) to (17) are further refinements of the first step to the eighth step above.
(6) Tool assembly for carrying out composite acid fracturing construction pipe column according to construction target layer section
And (3) according to the number of the reconstruction sections and the depth position requirement of each section determined in the step (2), assembling tools of the composite acid fracturing pipe column on the ground, and then entering the well according to the construction requirement sequence.
(7) Pipe column depth checking and fracturing well head
And (4) after the whole pipe column enters the well, performing pipe column depth correction, adjusting the pipe column depth according to the depth correction result, aligning the pipe column spray gun to the construction target interval respectively, and then loading the fracturing well mouth.
(8) Preparation for fracturing construction
And carrying out the configuration of fracturing equipment, fracturing materials and construction liquid and the like according to the fracturing construction design.
(9) Performing the first stage of acid fracturing construction
And (3) during the first-stage acid fracturing construction, the composite acid fracturing construction pipe column is equivalent to the construction of a common smooth oil pipe, the construction scale is large-scale acid fracturing reconstruction, different acid liquor liquid is injected in a stage-by-stage variable displacement and variable viscosity mode according to the construction parameters optimized in the step (5), and non-uniform etching reconstruction is carried out on the stratum to form a high-diversion crack.
(10) Replacement work
And adopting over-displacement operation, wherein the displacement amount is 5-10 square of the volume V of the current section of the shaft. Inputting the temporary plugging jelly from the oil pipe for replacement, and driving 3-5 square slick water to isolate acid liquor before injecting the jelly. And (4) temporarily plugging the jelly to isolate the first construction layer section, and automatically dissolving and discharging the jelly back to the wellhead after the whole well is constructed. The annulus is not displaced in this step.
(11) Well head ball throwing and second construction section
And (3) throwing a ball M1 from the first wellhead, enabling the composite material sealing ball to fall into a sliding sleeve sealing step with a sliding sleeve spray gun 4, pressing the oil pipe, cutting off a shear pin, enabling the sealing ball to move downwards along with the sliding sleeve to enter a sliding sleeve seat, simultaneously exposing a spray gun nozzle, and then performing injection perforation and acid fracturing modification construction on the second section according to the construction parameters optimized in the step (5). At the moment, acid liquor is injected into the oil pipe, foam active water or acidic slickwater is injected into the annular space, the two liquids are non-uniformly mixed at the outlet of the nozzle and enter the stratum together, and the non-uniform mixed acid liquor is used for carrying out non-uniform etching transformation on the stratum so as to form a high-diversion crack. The foam active water may be nitrogen foam, carbon dioxide foam, air foam, etc., and it is recommended to use nitrogen foam active water. The ratio of the annular displacement to the oil pipe displacement is generally between 0.2 and 2, the recommended displacement ratio is 0.3 to 1.5, and the optimal displacement ratio is 0.5 to 0.8. In the existing acidification process, no liquid is injected into the annular space, but the invention increases the non-uniformity of etching by injecting foam active water or acidic slick water into the annular space, and obtains cracks with higher conductivity.
(12) Replacement work
And (5) repeating the step (10) to finish the second-stage replacement operation. And injecting jelly glue into the oil pipe, wherein the replacement is different from the replacement in the first section, annular displacement is required in the step, and the annular displacement is realized by using slick water.
(13) Ball throwing at well head and constructing third section
And (3) putting M2 at the well mouth again, wherein the composite sealing ball is slightly larger than the first M1 ball, falls into a sliding sleeve with a sliding sleeve spray gun 3, an oil pipe is pressed, a shear pin is sheared, the sealing ball moves downwards along with the sliding sleeve to enter a sliding sleeve seat, a spray gun nozzle is exposed, and then, the injection perforation and sand fracturing reconstruction construction is carried out on the third section according to the construction parameters optimized in the step (5). At the moment, the sand-containing liquid is injected into the oil pipe, the fracturing fluid base fluid is injected into the annular space, and the target layer is subjected to injection fracturing modification. The ratio of the annular displacement to the oil pipe displacement is generally 0.5-1.0, and the displacement ratio is properly adjusted according to the construction pressure change.
(14) Last replacement operation
And adopting over-displacement operation, wherein the displacement amount is that the volume V of the current section of the shaft is added by 2-5 square. And (4) selecting slickwater as the displacement liquid after the whole well construction is finished.
(15) And closing the well and measuring the pressure drop.
And (5) performing well closing and pressure drop measurement according to the construction design.
(16) Testing original pipe column to obtain yield
And (5) after the pressure measurement and the pressure reduction are finished, performing open flow on the original pipe column according to design requirements, and testing and solving the yield.
(17) And (4) determining the original tubular column to produce or re-setting the tubular column after re-setting the tubular column according to the test yield result.
The tubular column can complete a plurality of measures such as large-scale acid fracturing, hydraulic jet sand fracturing and hydraulic jet acid fracturing, and can improve the staged modification efficiency of the target interval by stages, and meanwhile, the plurality of modification measures improve the complexity of reservoir modification, form a complex fracture system, reduce the development cost and effectively improve the fracturing yield-increasing effect.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.
Claims (11)
1. The utility model provides a compound acid fracturing construction tubular column which characterized in that: the composite acid fracturing construction pipe column comprises at least one spray gun with a sliding sleeve, a slotted pipe and a hollow guide head;
the spray guns with the sliding sleeves are connected in sequence; the lower end of the last spray gun with the sliding sleeve is connected with the upper end of the slotted pipe;
the lower end of the slit pipe is connected with the hollow guide head;
the slotted pipe is a hollow pipe, and the wall of the slotted pipe is thicker than that of the oil pipe;
a plurality of slits parallel to the central axis of the slotted pipe are arranged on the pipe wall of the slotted pipe; the slotted pipe is used for allowing fluid to pass when large-displacement construction is carried out so as to reduce construction friction resistance;
the hollow guide head is of a cylindrical structure, and a central through hole coaxial with the hollow guide head is formed in the hollow guide head; the central through hole of the hollow guide head comprises a large-diameter section and a small-diameter section which are sequentially connected; the diameter of the small-diameter section is smaller than that of the large-diameter section;
during large-scale acid fracturing reconstruction construction, construction liquid enters a stratum through a central through hole of the hollow guide head and a seam on the slotted pipe.
2. The composite acid fracturing construction string of claim 1, wherein: the composite acid fracturing construction pipe column comprises an oil pipe and a safety joint;
the oil pipe is connected with the upper end of the safety joint, and the lower end of the safety joint is connected with the upper end of the first spray gun with the sliding sleeve;
and a centralizer is arranged at the upper end of the first spray gun with the sliding sleeve.
3. The composite acid fracturing construction string of claim 1 or 2, wherein: the inner diameters of the spray guns with the sliding sleeves are different, and from the first spray gun with the sliding sleeve to the last spray gun with the sliding sleeve, the inner diameters of the spray guns with the sliding sleeves are reduced in sequence.
4. The composite acid fracturing construction string of claim 3, wherein: each spray gun with sliding sleeve all includes: the spray gun comprises a spray gun body, a spray gun sliding sleeve and a spray gun sliding sleeve seat;
the spray gun body is of a cylindrical structure, and a central through hole coaxial with the spray gun body is formed in the spray gun body; the wall of the spray gun body is provided with a nozzle mounting hole, and the nozzle mounting hole is used for communicating a central through hole of the spray gun body with the outside of the spray gun body; a nozzle is arranged in the nozzle mounting hole;
the spray gun sliding sleeve is arranged in a central through hole of the spray gun body; the lower end of the spray gun sliding sleeve is fixed on the spray gun body through shear pins, and at the moment, the spray gun sliding sleeve blocks each spray nozzle; the upper end of the spray gun sliding sleeve is provided with a sliding sleeve sealing step which is used for being matched with the sealing ball;
the lower end of the spray gun body is connected with the upper end of the spray gun sliding sleeve seat;
a central through hole coaxial with the spray gun sliding sleeve seat is formed in the spray gun sliding sleeve seat, and a step is arranged on the inner wall of the middle part of the central through hole of the spray gun sliding sleeve seat; when the spray gun sliding sleeve moves downwards into the central through hole of the spray gun sliding sleeve seat, the lower end of the spray gun sliding sleeve is propped against the step, and the spray nozzle is opened at the moment.
5. The composite acid fracturing construction string of claim 4, wherein: a centralizer is arranged outside each spray gun sliding sleeve seat;
oil pipe threads are arranged at the upper end of each spray gun body and the lower end of the spray gun sliding sleeve seat;
oil pipe threads are arranged at the two ends of the oil pipe, the two ends of the safety joint and the two ends of the slotted pipe;
and oil pipe threads are arranged on the inner wall of the large-diameter section.
6. The method of using the composite acid fracturing construction string according to any one of claims 1 to 5, wherein: the method adopts a single string to complete open hole well multilayer acid fracturing and jet perforation fracturing construction; the method comprises the following steps:
firstly, determining the number of spray guns with sliding sleeves, the arrangement mode of nozzles on each spray gun with sliding sleeves, the number of nozzles and the size of the nozzles according to the number of reconstruction sections, the property of construction sections and the optimization result of crack parameters; assembling the composite acid fracturing construction pipe column according to the number of the reconstruction intervals and the depth position requirement of each interval, and then putting all the pipe columns into a well;
secondly, correcting the depth of the pipe column, adjusting the depth of the composite acid fracturing construction pipe column according to the depth correction result, aligning each spray gun with a sliding sleeve to the corresponding construction target layer section, then connecting an oil pipe hanger, sitting on a wellhead four-way, and then installing a fracturing wellhead;
thirdly, construction preparation before fracturing is carried out;
and fourthly, constructing the first construction layer section: the nozzles of the spray guns with the sliding sleeves are not opened, and construction liquid enters the stratum through the central through hole of the hollow guide head and the seam on the slotted pipe to construct a first construction layer section; then isolating the first construction layer section;
and fifthly, constructing each construction layer section in the middle: and sequentially carrying out the following operations from the last spray gun with the sliding sleeve to the second spray gun with the sliding sleeve: throwing a sealing ball from a wellhead, opening a nozzle of the spray gun with the sliding sleeve, and constructing a construction layer section corresponding to the spray gun with the sliding sleeve; then isolating the construction layer section; the diameters of the added sealing balls are sequentially increased;
and sixthly, performing construction of the last construction layer section: throwing a sealing ball from a wellhead, opening a first nozzle with a sliding sleeve spray gun, and constructing the last construction layer section; replacing slippery water in the later construction period; closing the well and measuring the pressure drop after the construction is finished; after pressure measurement and reduction are finished, opening the well according to design requirements, and performing open flow and test production solving on the composite acid fracturing construction pipe column; during blowout, all the sealing balls are discharged out of the ground along with the liquid;
and seventhly, determining whether the composite acid fracturing construction pipe column or the composite acid fracturing construction pipe column is produced according to the test yield result.
7. The method of application according to claim 6, characterized in that: the fourth step is that the construction of the first construction layer section adopts large-scale acid fracturing reconstruction construction;
in the fifth step, the construction of the construction layer section corresponding to the spray gun with the sliding sleeve is carried out, and in the sixth step, the construction of the last construction layer section is carried out by adopting the following steps: carrying out jet perforation and acid fracturing reconstruction construction or jet perforation and sand fracturing reconstruction construction or acid fracturing reconstruction construction;
the operation of the injection perforation and acid fracturing reconstruction construction comprises the following steps:
injecting acid liquor into an oil pipe, injecting foam active water or acidic slickwater from an annular space, carrying out non-uniform mixing on the two liquids at an outlet of the nozzle to form non-uniform mixed acid liquor, and carrying out non-uniform etching modification on the stratum by the non-uniform mixed acid liquor after the two liquids enter the stratum to form a high diversion crack;
the foam active water adopts the following components: nitrogen foam active water, carbon dioxide foam active water or air foam active water;
the ratio of the annular displacement to the oil pipe displacement is between 0.2 and 2.
8. The method of application according to claim 7, characterized in that:
the ratio of the annular displacement to the oil pipe displacement is 0.3-1.5.
9. The method of application according to claim 7, characterized in that:
the ratio of the annular displacement to the oil pipe displacement is as follows: 0.5-0.8.
10. The method of application according to claim 6, characterized in that: the operation of isolating the first construction interval in the fourth step comprises: adopting over-displacement operation, wherein the displacement amount is the volume V of the current section of the shaft and is added by 5-10 square;
firstly, injecting 3-5 square slick water from an oil pipe, and then injecting temporary plugging jelly from the oil pipe for replacement, wherein the temporary plugging jelly isolates a first construction layer section;
the operation of isolating the construction interval in the fifth step comprises: adopting over-displacement operation, wherein the displacement amount is that the volume V of the current section of the shaft is added by 5-10 square;
firstly, injecting 3-5 square slickwater from an oil pipe, then injecting temporary plugging gel from the oil pipe for replacement, injecting slickwater from the annulus for replacement, and isolating the construction interval.
11. The method of application according to claim 6, characterized in that: the operation of throwing the sealing ball from the wellhead and opening the nozzle of the spray gun with the sliding sleeve in the fifth step, the operation of throwing the sealing ball from the wellhead and opening the nozzle of the first spray gun with the sliding sleeve in the sixth step all comprise:
throwing a sealing ball from a wellhead, wherein the sealing ball falls into a sliding sleeve sealing step with a sliding sleeve spray gun, and the sealing ball is sealed with the sliding sleeve sealing step; the oil pipe is pressed, the shear pin is cut off, the sealing ball moves downwards along with the spray gun sliding sleeve to enter the spray gun sliding sleeve seat and is propped against the step in the spray gun sliding sleeve seat, and at the moment, the nozzle is opened.
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| CN112324377B (en) * | 2020-11-25 | 2023-12-12 | 山东海洋工程装备有限公司 | Downhole operation tool and method for permanently abandoned well of deep sea drillless machine |
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| CN204126624U (en) * | 2014-09-30 | 2015-01-28 | 中国石油集团渤海钻探工程有限公司 | Open-hole horizontal well fixed tubular column jetting sectional well completion fracturing string |
| US9719334B2 (en) * | 2015-03-03 | 2017-08-01 | William Jani | Method and tool for perforating a wellbore casing in a formation using a sand jet, and using such tool to further frac the formation |
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