CN111042767A - Horizontal well segmented acidizing, filling and sand prevention integrated pipe column and method - Google Patents
Horizontal well segmented acidizing, filling and sand prevention integrated pipe column and method Download PDFInfo
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- CN111042767A CN111042767A CN201811186560.5A CN201811186560A CN111042767A CN 111042767 A CN111042767 A CN 111042767A CN 201811186560 A CN201811186560 A CN 201811186560A CN 111042767 A CN111042767 A CN 111042767A
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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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
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
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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
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a horizontal well subsection acidizing, filling and sand prevention integrated pipe column and a method. The invention can realize that one-trip pipe column completes the sand prevention construction of segmented acid washing, circulating filling and extrusion filling of the long well section of the horizontal well, ensures the good blockage removal effect of the open hole horizontal section, fully exerts the productivity of the open hole horizontal well and achieves the best sand prevention production effect.
Description
Technical Field
The invention relates to an oil well pipe column, in particular to a horizontal well sectional acidizing, filling and sand prevention integrated pipe column and a method.
Background
In the running process of the screen pipe for the open hole horizontal well completion, slurry blockage of the screen pipe is easy to occur, and the prior acid washing technology cannot realize uniform blockage removal of the screen pipe and uniform acid distribution of a long well section, so that the blockage of a near well and the screen pipe after the screen pipe completion is not thoroughly removed, and the seepage capability and the liquid supply capability of a later-period oil well are influenced. In order to solve the problems, a secondary running pipe column is adopted to carry out open hole sieve tube gravel packing sand prevention construction, and stratum blockage is further removed. In order to simplify the process and improve the acid washing effect, the segmented acidizing, filling and sand prevention integrated tubular column of the horizontal well is researched and developed, the technical problem existing in the conventional acid washing is solved, and the segmented acidizing, deblocking and filling integrated construction of the barefoot screen pipe well completion is realized.
By searching segmentation, acidification, filling and sand prevention keywords, a tubular column with all integrated functions is not found, and the independent search of segmentation and acidification keywords is a tubular column public technology with some segmentation acidification, but is different from the technical scheme of the invention; the method for searching the key words of filling and sand control independently is a public technology of some filling sand control tubular columns, but is different from the technical scheme of the invention.
In some tubular columns in the prior art, the technical problems to be solved by the invention cannot be solved.
Disclosure of Invention
The invention aims to provide a horizontal well segmented acidizing, filling and sand prevention integrated pipe column and a method, the process pipe column can realize that one-trip pipe column completes segmented pickling, circulating filling and extrusion filling sand prevention construction of a long well segment of a horizontal well, ensures a good blockage removal effect of a naked eye horizontal segment, fully exerts the productivity of the naked eye horizontal well and achieves the best sand prevention production effect; meanwhile, the tubular column ensures the sealing effect and the construction effect through the optimized structural design of the sealing structure, the filling port and the like, greatly improves the construction efficiency and the construction success rate, reduces the operation cost and prolongs the service life of the sand control well.
In order to achieve the purpose, the horizontal well segmented acidizing, filling and sand prevention integrated pipe column is characterized in that the outer pipe column comprises an open hole packer, a sand filtering pipe, a two-way nest type sealing device, an outer pipe column connecting pipe, an outer filling device and a plug which are sequentially connected from top to bottom, the inner pipe column comprises a flow blocking packer, an expansion packer, an inner pipe column connecting pipe, an acid spraying packer and an inner filling device which are sequentially connected from top to bottom, and the flow blocking packer, the expansion packer and the acid spraying packer are all sealed on the inner wall of the sand filtering pipe.
The open hole packer upper portion is connected with cementing device, sleeve pipe screw thread formula in proper order, the open hole packer lower part is connected with sand screen pipe screw thread formula through outer pipe column connection head, sand screen pipe lower part is connected through two-way nest type sealing top connection screw thread formula with two-way nest type sealing device, two-way nest type sealing device is connected with outer pipe column connection pipe screw thread through two-way nest type sealing bottom connection, outer pipe column connection pipe lower part is detained with outer packing device upper portion and is closed to salvage and detain the screw thread formula and be connected, outer packing device is connected with end cap screw thread formula through the outer instrument of filling of its lower part.
The bidirectional nested sealing device consists of a bidirectional nested sealing upper joint, a bidirectional nested sealing piece and a bidirectional nested sealing lower joint; the bidirectional nested sealing element adopts a bidirectional nested sealing structure, the bidirectional nested sealing element is nested in the inner wall of the bidirectional nested sealing upper joint, the inner wall of the bidirectional nested sealing element and the outer wall of an inner filling tool of an inner filling device are in a sealing state, and the bidirectional nested sealing upper joint is in threaded connection with the bidirectional nested sealing lower joint.
The external filling device is composed of a closing fishing buckle, an external filling tool and a blocking cap, wherein the external filling tool is provided with an external filling opening which is radially communicated, the closing fishing buckle is in threaded connection with the upper end of the external filling tool, and the blocking cap is in threaded connection with the lower end of the external filling tool. The upper end of the external filling device is in threaded connection with the lower end of the outer pipe column connecting pipe by closing the fishing buckle, and the lower end of the external filling tool is in threaded connection with the plug.
The flow-resisting packer comprises a flow-resisting upper joint, a flow-resisting sealing piece, a flow-resisting inner sealing pipe, a flow-resisting pressure sealing cap and a flow-resisting lower joint, the upper choke seal joint is connected with the upper tubing thread, the lower end of the upper choke seal joint is connected with the inner choke seal tube thread, the flow-resisting seal piece is sleeved on the seal cylinder seat, the lower end of the flow-resisting seal piece is connected with a flow-resisting pressure-sealing cap, the flow-resisting pressure-sealing cap is in threaded connection with the seal cylinder seat, the flow-resisting sealing inner pipe is in threaded connection with the flow-resisting sealing lower joint, a flow-resisting sealing spring is arranged on the flow-resisting sealing inner pipe and can slide on the outer wall of the flow-resisting sealing inner pipe for a certain distance, one end of the flow-resisting sealing spring is propped against the lower part of the flow-resisting sealing cap, the other end of the flow-resisting sealing spring is propped against the upper part of the flow-resisting sealing lower joint, and the lower end of the flow blocking lower connector of the flow blocking packer is in threaded connection with the upper end of the expansion sealing support piece of the expansion packer.
The expansion packer comprises an expansion sealing support piece and a sealing barrel, wherein a hydraulic port which is radially communicated is formed in the expansion sealing support piece, the sealing barrel is sleeved on the outer wall of the expansion sealing support piece, the lower end of the expansion sealing support piece is connected with the inner tubular column connecting head in a thread-type manner, and the lower end of the inner tubular column connecting head is connected with the upper end of the inner tubular column connecting pipe in a thread-type manner.
The acid spraying packer comprises an upper joint of the acid spraying packer, a sliding sleeve, a ball seat, an upper pressing cap, a sealing element, a supporting framework, a lower pressing cap and a lower joint of the acid spraying packer, wherein the upper end of the upper joint of the acid spraying packer is connected with an inner tubular column connecting pipe, the lower end of the upper joint of the acid spraying packer is connected with the upper pressing cap, the sealing element is sleeved on the outer wall of the supporting framework, the upper pressing cap presses the upper end of the sealing element, the lower pressing cap presses the lower end of the sealing element, the upper pressing cap and the lower pressing cap are connected with the supporting framework in a threaded manner, the lower end of the supporting framework is connected with the lower joint of the acid spraying; the sliding sleeve is connected to the upper end of the ball seat, slides on the inner wall of the upper joint of the acid-spraying packer, is provided with a liquid flow through a slot, is provided with a spring on the outer wall of the sliding sleeve, pushes the upper end of the spring against the lower end face of the sliding sleeve, and pushes the lower end of the spring against the upper end face of the supporting framework.
The inner filling device comprises an inner filling tool and a plug, the upper end of the inner filling tool is connected with a lower joint of an acid spraying packer of the acid spraying packer, the lower end of the inner filling tool is connected with the plug, an inner filling opening which is radially communicated is formed in the inner filling tool, and the inner filling tool is also connected with the plug through a releasing pin.
In order to achieve the purpose, the invention adopts the following technical scheme that the horizontal well segmented acidizing, filling and sand prevention integrated method comprises the following steps:
the method comprises the following steps: running a pipe column; the well-connected outer pipe column is put into a bare hole horizontal well, the setting of a bare hole packer is completed, and then the well cementation and drifting procedures are completed; the designed and connected inner pipe columns are put into a sand filtering pipe section in the well through an oil pipe; the whole length of the inner pipe column is adjusted through the length of the inner pipe column connecting pipe, and meanwhile, the setting position of the acid spraying packer is adjusted; the indication that the inner pipe column is put in place is that the inner pipe column is put to the bottom until the blanking plug is inserted into the closed fishing buckle, the bottommost part of the inner pipe column is put in through the pressure build-up caused by liquid filling of the oil pipe, and the length of the inner pipe column at the position is recorded; then lifting the inner pipe column by 0.5-1m to be the lowering position of the inner pipe column, and then carrying out the next step;
step two: segmented acidification; closing the casing gate, dropping steel balls into the ball seat of the acid spraying packer, and extruding acid liquor from the oil pipe; setting the acid spraying packer and the expansion packer under the action of acid liquor pressure, sealing the interval between the two packers and other sections, simultaneously opening a sliding sleeve in the acid spraying packer, and enabling acid liquor to enter a sand filtering pipe section between the two packers from a liquid flow port of the acid spraying packer, so that the aim of extruding the acid liquor into the section between the two packers can be fulfilled; after the acid liquor is extruded, stopping pumping, and then automatically unsealing the two packers; then the inner pipe column is lowered to the next section to repeat the acid squeezing process; until all sections are processed;
step three: acid liquor is discharged back; putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one, and then lifting the inner pipe column by 0.5-1 m; opening a casing valve, injecting a well washing liquid from the oil casing annulus to carry out large-discharge backwashing, allowing the liquid to enter an open hole oil layer from the upper part of a sand filtering pipe section from the oil casing annulus under the action of a flow blocking packer, and returning the liquid out of a well mouth through an outer filling port on an outer filling device, an inner filling port of an inner filling device and an oil pipe until balls, acid liquor and pollutants are thoroughly washed out;
step four: circularly filling and preventing sand; if the circulating filling sand prevention construction is required, the step is carried out; pumping filling mortar from the oil pipe, wherein the mortar enters the open hole oil layer and the sand filtering pipe section from the oil pipe through an inner filling port of the inner filling device and an outer filling port on the outer filling device, and returns out from the upper part of the sand filtering pipe section through the oil sleeve annulus;
step five: squeezing, filling and sand prevention; if the extrusion filling sand prevention construction is required, the step is carried out; closing the casing gate, pumping filling mortar from the oil pipe, allowing the mortar to enter an open hole oil layer and a sand filtering pipe section from the oil pipe through an inner filling port of the inner filling device and an outer filling port on the outer filling device, and completing extrusion filling sand prevention construction when the pressure is increased by 8-10 MPa;
step six: releasing the hands and pulling up the tubular column; putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one; the plug on the inner filling device is inserted into the closed fishing buckle of the outer filling device, the inner pipe column rotates forward for 10-15 circles to realize buckling, at the moment, the plug blocks the outer filling opening, then the plug is lifted for 6-8t, the releasing pin on the inner filling device can be cut off, releasing is realized, and the inner pipe column is pulled out.
Compared with the prior art, the invention has the following beneficial effects:
(1) the segmented acid washing blockage removal and circulation of the long well section of the horizontal well and the extrusion filling sand prevention construction can be completed by one pipe column.
(2) The process pipe column is provided with the bidirectional nested sealing element, so that a good sealing effect in the process of pulling the pipe column down for many times can be ensured, and the construction efficiency and the success rate are ensured.
Drawings
FIG. 1 is a schematic structural diagram of a horizontal well sectional acidizing, filling and sand prevention integrated pipe column;
FIG. 2 is a sectional view of the horizontal well sectional acidizing, filling and sand prevention integrated pipe column structure;
FIG. 3 is a schematic diagram of a horizontal well staged acidizing step;
FIG. 4 is a schematic diagram of the acid liquid flowback step;
FIG. 5 is a schematic diagram of a sand control step of the circulation packing;
FIG. 6 is a schematic diagram of a squeeze pack sand control procedure.
In the figure: the device comprises an oil casing annulus 1, an oil pipe 2, a casing 3, a cement ring 4, an open hole packer 5, an open hole annulus 6, a sand screen 7, a bidirectional nest type sealing device 8, an outer tubular column connecting pipe 9, an outer filling device 10, a plug 11, a flow blocking packer 12, an expansion packer 13, an inner tubular column connecting pipe 14, an acid spraying packer 15 and an inner filling device 16.
The device comprises an outer tubular column connector 17, a bidirectional nested sealing upper connector 18, a bidirectional nested sealing member 19, a bidirectional nested sealing lower connector 20, a closing fishing buckle 21, an outer filling tool 22, an outer filling port 23, a blocking cap 24, a tubing coupling 25, a blocking sealing upper connector 26, a blocking sealing member 27, a blocking sealing inner tube 28, a blocking sealing cap 29, a pin 30, a blocking sealing lower connector 31, an expanding sealing support 32, a sealing barrel 33, an inner tubular column connector 34, an acid-spraying packer upper connector 35, a sliding sleeve 36, an acid-spraying packer liquid flow port 37, a spring 38, a ball seat 39, an upper pressing cap 40, a sealing member 41, a supporting framework 42, a lower pressing cap 43, an acid-spraying packer lower connector 44, an inner filling tool 45, an inner filling port 46, a releasing pin 47, a blanking plug 48 and a blocking sealing spring 49.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, the present invention provides a technical solution: a horizontal well subsection acidizing, filling and sand prevention integrated pipe column mainly comprises an outer pipe column and an inner pipe column. The outer pipe column consists of an open hole packer 5, a sand filtering pipe 7, a bidirectional nested sealing device 8, an outer pipe column connecting pipe 9, an outer filling device 10 and a plug 11 which are sequentially connected from top to bottom. The inner pipe column consists of a flow blocking packer 12, an expansion packer 13, an inner pipe column connecting pipe 14, an acid spraying packer 15 and an inner filling device 16 which are sequentially connected from top to bottom.
The upper part of the open hole packer 5 is connected with a sleeve in a threaded manner, the lower part of the open hole packer is connected with a sand filtering pipe 7 in a threaded manner through an outer pipe column connector 17, the lower part of the sand filtering pipe is connected with a bidirectional nested sealing device 8 in a threaded manner through a bidirectional nested sealing upper connector 18, the lower part of the bidirectional nested sealing device 8 is connected with an outer pipe column connecting pipe 9 in a threaded manner through a bidirectional nested sealing lower connector 20, the lower part of the outer pipe column connecting pipe is connected with a closing fishing buckle 21 in the upper part of an outer filling device 10 in a threaded manner, and the outer filling device is connected with a plug 11 in a threaded manner through an outer filling tool 22 in the.
The bidirectional nested sealing device 8 consists of a bidirectional nested sealing upper joint 18, a bidirectional nested sealing piece 19 and a bidirectional nested sealing lower joint 20. The two-way nested sealing element adopts the two-way nested sealing structure, so that on one hand, a good sealing effect is ensured, and on the other hand, the inner pipe column can be ensured not to be scraped off when being pulled down for many times.
The external filling device 10 consists of a closing fishing buckle 21, an external filling tool 22 and a stop cap 24. The outer filling tool is provided with an outer filling opening 23 which is through in the radial direction, the fishing buckle is closed to be in threaded connection with the upper end of the outer filling tool, the blocking cap is in threaded connection with the outer wall of the lower end of the outer filling tool, the blocking cap is used for buffering impact force of liquid flow which is stabbed from the outer filling opening, and guiding the liquid flow to flow into the sand filtering pipe section on the upper portion to a certain extent, so that the corresponding construction effect is guaranteed. The upper end of the external filling device is connected with the lower end of the outer pipe column connecting pipe 9 in a threaded manner by closing the fishing buckle, and the lower port of the external filling tool is connected with the plug 11 in a threaded manner.
The choke packer 12 is composed of a choke seal upper joint 26, a choke seal upper seal 27, a choke seal inner tube 28, a choke seal press cap 29 and a choke seal lower joint 31, the upper end of the choke seal upper joint is in threaded connection with an oil pipe coupling 25, the lower end of the choke seal upper joint is in threaded connection with the choke seal inner tube 28, the choke seal is sleeved on a seal barrel seat 30, the lower end of the choke seal upper joint is connected with the choke seal press cap, the choke seal press cap is in threaded connection with the seal barrel seat, the choke seal inner tube is in threaded connection with the choke seal lower joint, a choke seal spring 49 is arranged on the choke seal inner tube and can slide on the outer wall of the choke seal inner tube for a certain distance, one end of the choke seal spring is pressed against the lower part of the choke seal press cap, and the other end of the choke seal spring is pressed against the upper part of the choke seal. The lower end of the flow-resisting sealing lower joint of the flow-resisting packer is in threaded connection with the upper end of the expansion sealing support element 32 of the expansion packer.
The expansion packer 13 consists of an expansion seal support member 32 and a sealing barrel 33. And the expansion seal supporting piece is provided with a hydraulic port which is communicated in the radial direction. The sealing cylinder 33 is sleeved on the outer wall of the expansion sealing support piece 32, the lower end of the expansion sealing support piece is connected with the inner pipe column connector 34 in a threaded mode, and the lower end of the inner pipe column connector is connected with the upper end of the inner pipe column connecting pipe 14 in a threaded mode.
The acid-spraying packer 15 consists of an acid-spraying packer upper joint 35, a sliding sleeve 36, a ball seat 39, an upper pressing cap 40, a sealing element 41, a supporting framework 42, a lower pressing cap 43 and an acid-spraying packer lower joint 44, wherein the upper end of the acid-spraying packer upper joint is connected with an inner tubular column connecting pipe 14, the lower end of the acid-spraying packer upper joint is connected with the upper pressing cap, the sealing element is sleeved on the outer wall of the supporting framework, the upper pressing cap presses the upper end of the sealing element, the lower pressing cap presses the lower end of the sealing element, the upper pressing cap and the lower pressing cap are in threaded connection with the supporting framework, the lower end of the supporting framework is connected with the acid-spraying packer lower joint, and the acid-spraying; the sliding sleeve is connected to ball seat 39 upper end, and the sliding sleeve slides at sour packer upper joint inner wall of spouting, is equipped with on the ball seat to be used for the liquid stream to pass through the slot, is equipped with spring 38 on the sliding sleeve outer wall, and the terminal surface under the sliding sleeve is pushed up to the spring upper end, and the spring lower extreme pushes up at the support chassis up end. The spring 38 can contract under the action of pressure to expose the liquid flow port of the acid-spraying packer; the ball seat is provided with a slot for liquid flow to pass through, the sealing element is expanded and sealed under the action of pressure, and the sealing element is automatically unsealed when the hydraulic pressure is released, so that the segmented acidizing function of a long well section can be realized in a matched manner.
The inner filling device 16 consists of an inner filling tool 45 and a blanking plug 48, the upper end of the inner filling tool is connected with an acid spraying packer lower joint 44 of an acid spraying packer, the lower end of the inner filling tool is connected with the blanking plug 48, an inner filling opening 46 which is radially communicated is arranged on the inner filling tool, and the inner filling tool is also connected with the blanking plug through a releasing pin 47.
In order to achieve the purpose, the invention adopts the following technical scheme that the horizontal well segmented acidizing, filling and sand prevention integrated method comprises the following steps:
according to fig. 3-5.
The method comprises the following steps: running a pipe column; the well-connected outer pipe column is put into a bare hole horizontal well, the setting of a bare hole packer 5 is completed, and then the well cementation and drifting processes are completed; the designed and connected inner pipe column is put into a sand filtering pipe section in the well through an oil pipe 2; the whole length of the inner pipe column is adjusted through the length of the inner pipe column connecting pipe 14, and meanwhile, the setting position of the acid spraying packer 15 is adjusted; the indication that the inner pipe column is put in place is that the inner pipe column is firstly put to the bottom until the blanking plug 48 is inserted into the closed fishing buckle 21, the pressure is suppressed through the liquid filling of the oil pipe, the bottommost part of the inner pipe column is put in, and the length of the inner pipe column at the position is recorded; then lifting the inner pipe column by 0.5-1m to be the lowering position of the inner pipe column, and then carrying out the next step;
step two: stepwise acidification (see fig. 3); closing the casing gate, dropping the steel ball into the ball seat 39 of the acid-spraying packer, and extruding the acid liquor from the oil pipe 2; the acid spraying packer 15 and the expansion packer 13 are set under the action of acid liquid pressure, the interval between the two packers and other sections are sealed, meanwhile, a sliding sleeve 36 in the acid spraying packer is opened, and acid liquid enters a sand filtering pipe section between the two packers from an acid spraying packer liquid flow port 37, so that the aim of extruding the acid liquid into the section between the two packers can be fulfilled; after the acid liquor is extruded, stopping pumping, and then automatically unsealing the two packers; then the inner pipe column is lowered to the next section to repeat the acid squeezing process; until all sections are processed;
step three: acid liquor backflow (refer to fig. 4); putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one, and then lifting the inner pipe column by 0.5-1 m; opening a casing valve, injecting a well washing liquid from the oil casing annulus 1 to perform large-discharge backwashing, allowing the liquid to enter an open hole oil layer from the upper part of a sand filtering pipe section from the oil casing annulus 1 under the action of a flow blocking packer 12, and returning the liquid out of a well head through an outer filling port 23 on an outer filling device 10, an inner filling port 46 of an inner filling device 16 and an oil pipe 2 until balls, acid liquid and pollutants are thoroughly washed out;
step four: sand control by cyclic packing (see fig. 5); if the circulating filling sand prevention construction is required, the step is carried out; pumping filling mortar from the oil pipe 2, wherein the mortar enters an open hole oil layer and a sand filtering pipe section from the oil pipe through an inner filling port 46 of an inner filling device 16 and an outer filling port 23 on an outer filling device 10, and returns from the upper part of the sand filtering pipe section through an oil sleeve annulus 1;
step five: squeeze pack sand control (see fig. 6); if the extrusion filling sand prevention construction is required, the step is carried out; closing the casing gate, pumping filling mortar from the oil pipe 2, enabling the mortar to enter an open hole oil layer and a sand filtering pipe section from the oil pipe through an inner filling port 46 of the inner filling device 16 and an outer filling port 23 on the outer filling device 10, and completing extrusion filling sand prevention construction when the pressure is increased by 8-10 MPa;
step six: releasing the hands and pulling up the tubular column; putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one; the plug 48 on the inner filling device 16 is inserted into the closing fishing buckle 21 of the outer filling device 10, the inner pipe column is positively rotated for 10-15 circles to realize buckling, at the moment, the plug blocks the outer filling opening 23, then the plug is lifted for 6-8t, the releasing pin 47 on the inner filling device 16 can be cut off, releasing is realized, and the inner pipe column is pulled out.
The horizontal well segmented acidizing, filling and sand prevention integrated pipe column and the method are suitable for segmented acidizing, blocking removal, extrusion and circulating filling and sand prevention construction of a barefoot horizontal well.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. Horizontal well segmentation acidizing is filled sand control integration tubular column, including outer tubular column and inner tubular column, the inner tubular column is located inside the outer tubular column, its characterized in that, the bore hole packer, sand screen, two-way nest type sealing device, outer tubular column connecting pipe, outer packing device, the end cap that outer tubular column includes that top-down connects gradually, the inner tubular column includes choked flow packer, expansion packer, inner tubular column connecting pipe, acid-spraying packer, interior packing device that top-down connects gradually, choked flow packer, expansion packer, acid-spraying packer all sit and seal on the sand screen inner wall.
2. The horizontal well subsection acidizing, filling and sand prevention integrated pipe column according to claim 1, wherein the upper part of the open hole packer is sequentially connected with a cementing device and a casing in a threaded manner, the lower part of the open hole packer is connected with a sand filtering pipe in a threaded manner through an outer pipe connector, the lower part of the sand filtering pipe is connected with a bidirectional nested sealing device in a threaded manner through a bidirectional nested sealing upper connector, the bidirectional nested sealing device is connected with an outer pipe connector in a threaded manner through a bidirectional nested sealing lower connector, the lower part of the outer pipe connector is connected with an outer filling device in a closed fishing and threaded manner through the upper part of the outer filling device, and the outer filling device is connected with an end cap in a threaded manner through an outer filling tool at the lower.
3. The horizontal well segmented acidizing, filling and sand control integrated tubular column according to claim 1 or 2, wherein the bidirectional nested sealing device consists of a bidirectional nested sealing upper joint, a bidirectional nested sealing piece and a bidirectional nested sealing lower joint; the bidirectional nested sealing element adopts a bidirectional nested sealing structure, the bidirectional nested sealing element is nested in the inner wall of the bidirectional nested sealing upper joint, the inner wall of the bidirectional nested sealing element and the outer wall of an inner filling tool of an inner filling device are in a sealing state, and the bidirectional nested sealing upper joint is in threaded connection with the bidirectional nested sealing lower joint.
4. The horizontal well subsection acidizing, filling and sand prevention integrated pipe column according to claim 1 or 2, wherein the external filling device is composed of a closing fishing buckle, an external filling tool and a blocking cap, wherein the external filling tool is provided with an external filling opening which is radially communicated, the closing fishing buckle is in threaded connection with the upper end of the external filling tool, the blocking cap is sleeved on the outer wall of the lower end of the external filling tool in a threaded manner, an axial upper port of the blocking cap is in a communicated state and is communicated with the external filling opening, the blocking cap blocks the external filling opening in the radial direction, the upper end of the external filling device is in threaded connection with the lower end of an outer pipe column connecting pipe by closing the fishing buckle, and the lower port of the external filling tool is in threaded connection with a plug.
5. The horizontal well segmented acidizing, filling and sand prevention integrated pipe string according to claim 1 or 2, wherein the choke packer comprises a choke seal upper joint, a choke seal sealing piece, a choke seal inner pipe, a choke seal pressing cap and a choke seal lower joint, the choke seal upper joint is in threaded connection with an upper oil pipe, the lower end of the choke seal upper joint is in threaded connection with the choke seal inner pipe, the choke seal sealing piece is sleeved on a seal barrel seat, the lower end of the choke seal sealing piece is connected with the choke seal pressing cap, the choke seal pressing cap is in threaded connection with a seal barrel seat, the choke seal inner pipe is in threaded connection with the choke seal lower joint, a choke seal spring is arranged on the choke seal inner pipe and can slide on the outer wall of the choke seal inner pipe for a certain distance, one end of the choke seal spring abuts against the lower portion of the choke seal pressing cap, the other end of the choke seal spring abuts against the upper portion of the choke seal lower joint, and the lower end of the flow blocking lower connector of the flow blocking packer is in threaded connection with the upper end of the expansion sealing support piece of the expansion packer.
6. The horizontal well segmented acidizing, filling and sand prevention integrated pipe column according to claim 1 or 2, wherein the expansion packer comprises an expansion sealing support piece and a sealing barrel, a hydraulic port which is radially communicated is formed in the expansion sealing support piece, the sealing barrel is sleeved on the outer wall of the expansion sealing support piece, the lower end of the expansion sealing support piece is connected with an inner pipe column connector in a threaded manner, and the lower end of the inner pipe column connector is connected with the upper end of an inner pipe column connecting pipe in a threaded manner.
7. The horizontal well segmented acidizing, filling and sand prevention integrated pipe column according to claim 1 or 2, wherein the acid-jet packer comprises an upper joint of the acid-jet packer, a sliding sleeve, a ball seat, an upper pressing cap, a sealing element, a supporting framework, a lower pressing cap and a lower joint of the acid-jet packer, the upper end of the upper joint of the acid-jet packer is connected with an inner pipe column connecting pipe, the lower end of the upper joint of the acid-jet packer is connected with the upper pressing cap, the sealing element is sleeved on the outer wall of the supporting framework, the upper end of the sealing element is pressed by the upper pressing cap, the lower end of the sealing element is pressed by the lower pressing cap, the upper pressing cap and the lower pressing cap are connected with the supporting framework in a thread-and-thread manner, the lower end; the sliding sleeve is connected to the upper end of the ball seat, slides on the inner wall of the upper joint of the acid-spraying packer, is provided with a liquid flow through a slot, is provided with a spring on the outer wall of the sliding sleeve, pushes the upper end of the spring against the lower end face of the sliding sleeve, and pushes the lower end of the spring against the upper end face of the supporting framework.
8. The horizontal well sectional acidizing, filling and sand prevention integrated pipe column according to claim 1 or 2, wherein the inner filling device comprises an inner filling tool and a plug, the upper end of the inner filling tool is connected with a lower joint of an acid-spraying packer, the lower end of the inner filling tool is connected with the plug, an inner filling opening which is radially communicated is formed in the inner filling tool, and the inner filling tool is further connected with the plug through a releasing pin.
9. The horizontal well subsection acidizing, filling and sand prevention integrated method is characterized by comprising the following steps:
the method comprises the following steps: running a pipe column; the well-connected outer pipe column is put into a bare hole horizontal well, the setting of a bare hole packer is completed, and then the well cementation and drifting procedures are completed; the designed and connected inner pipe columns are put into a sand filtering pipe section in the well through an oil pipe; the whole length of the inner pipe column is adjusted through the length of the inner pipe column connecting pipe, and meanwhile, the setting position of the acid spraying packer is adjusted; the indication that the inner pipe column is put in place is that the inner pipe column is put to the bottom until the blanking plug is inserted into the closed fishing buckle, the bottommost part of the inner pipe column is put in through the pressure build-up caused by liquid filling of the oil pipe, and the length of the inner pipe column at the position is recorded; then lifting the inner pipe column by 0.5-1m to be the lowering position of the inner pipe column, and then carrying out the next step;
step two: segmented acidification; closing the casing gate, dropping steel balls into the ball seat of the acid spraying packer, and extruding acid liquor from the oil pipe; setting the acid spraying packer and the expansion packer under the action of acid liquor pressure, sealing the interval between the two packers and other sections, simultaneously opening a sliding sleeve in the acid spraying packer, and enabling acid liquor to enter a sand filtering pipe section between the two packers from a liquid flow port of the acid spraying packer, so that the aim of extruding the acid liquor into the section between the two packers can be fulfilled; after the acid liquor is extruded, stopping pumping, and then automatically unsealing the two packers; then the inner pipe column is lowered to the next section to repeat the acid squeezing process; until all sections are processed;
step three: acid liquor is discharged back; putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one, and then lifting the inner pipe column by 0.5-1 m; opening a casing valve, injecting a well washing liquid from the oil casing annulus to carry out large-discharge backwashing, allowing the liquid to enter an open hole oil layer from the upper part of a sand filtering pipe section from the oil casing annulus under the action of a flow blocking packer, and returning the liquid out of a well mouth through an outer filling port on an outer filling device, an inner filling port of an inner filling device and an oil pipe until balls, acid liquor and pollutants are thoroughly washed out;
step four: circularly filling and preventing sand; if the circulating filling sand prevention construction is required, the step is carried out; pumping filling mortar from the oil pipe, wherein the mortar enters the open hole oil layer and the sand filtering pipe section from the oil pipe through an inner filling port of the inner filling device and an outer filling port on the outer filling device, and returns out from the upper part of the sand filtering pipe section through the oil sleeve annulus;
step five: squeezing, filling and sand prevention; if the extrusion filling sand prevention construction is required, the step is carried out; closing the casing gate, pumping filling mortar from the oil pipe, allowing the mortar to enter an open hole oil layer and a sand filtering pipe section from the oil pipe through an inner filling port of the inner filling device and an outer filling port on the outer filling device, and completing extrusion filling sand prevention construction when the pressure is increased by 8-10 MPa;
step six: releasing the hands and pulling up the tubular column; putting the inner pipe column into the bottom of the well, wherein the putting depth is the length of the inner pipe column recorded in the step one; the plug on the inner filling device is inserted into the closed fishing buckle of the outer filling device, the inner pipe column rotates forward for 10-15 circles to realize buckling, at the moment, the plug blocks the outer filling opening, then the plug is lifted for 6-8t, the releasing pin on the inner filling device can be cut off, releasing is realized, and the inner pipe column is pulled out.
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| CN201811186560.5A CN111042767B (en) | 2018-10-11 | 2018-10-11 | Horizontal well segmented acidizing filling sand prevention integrated tubular column and method |
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| CN115324536A (en) * | 2022-10-11 | 2022-11-11 | 山东普瑞思德石油技术有限公司 | Screen pipe string for bidirectional conversion between filling operation and blockage removing operation and using method |
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| CN115324536A (en) * | 2022-10-11 | 2022-11-11 | 山东普瑞思德石油技术有限公司 | Screen pipe string for bidirectional conversion between filling operation and blockage removing operation and using method |
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