阅读说明：本技术 一种石油修井工具的施工方法 (Construction method of petroleum well repairing tool ) 是由 不公告发明人 于 2017-10-16 设计创作，主要内容包括：本发明涉及一种石油修井工具的施工方法。其技术方案是包括以下步骤：一、下管柱,二、进行第一层地填和环填,从井口向丢手芯管内投入钢球,建立液体的循环通道,然后从井口注入液体,关闭套管阀门,向油层充填砂子,完成地填；再打开套管阀门,通过向丢手芯管内注入携砂液,完成环填；三、进行第二层地填和环填,地填和环填完成后,再进行丢手作业；本发明的有益效果是：本发明解决了现有单层充填工具不能分层充填的问题,也克服了现有设计的分层挤压充填工具中的内充填管柱和外充填管柱存在移动困难的问题,避免了开关失灵和定位不准的问题,较容易的实现了对多个油层的分层地填和环填,提高了作业效率,降低了成本。(The invention relates to a construction method of an oil well repairing tool. The technical scheme comprises the following steps: firstly, a pipe column is put down, secondly, first-layer ground filling and annular filling are carried out, steel balls are put into a releasing core pipe from a well mouth, a liquid circulation channel is established, then liquid is injected from the well mouth, a sleeve valve is closed, sand is filled into an oil layer, and ground filling is finished; then opening a sleeve valve, and injecting a sand carrying liquid into the releasing core pipe to complete annular filling; thirdly, performing second-layer ground filling and ring filling, and performing releasing operation after the ground filling and the ring filling are completed; the invention has the beneficial effects that: the invention solves the problem that the existing single-layer filling tool can not perform layered filling, also solves the problem that the inner filling pipe column and the outer filling pipe column in the existing layered extrusion filling tool are difficult to move, avoids the problems of switch failure and inaccurate positioning, easily realizes layered filling and annular filling of a plurality of oil layers, improves the operating efficiency and reduces the cost.)

1. A construction method of an oil well repairing tool is characterized by comprising the following steps:

firstly, lower pipe column: a blind plug (27) is put into a casing of an oil well, then a sand filtering pipe (28) is put into the casing, the lower part of the sand filtering pipe (28) is connected with the blind plug (27), then a first group of filling tools (10) are put into the casing, the sand filtering pipe (28) is connected with the filling tools (10) through a lower joint (3) of the filling tools, and meanwhile, a catcher on the upper part of a releasing core pipe (11) is connected with a lower joint (2) of a releasing core pipe of a second group of filling tools (10) through a compensator; two or more groups of filling tools are formed by connecting in sequence, and a packer (7) is arranged at the upper part of each group of filling tools (10);

secondly, performing first-layer ground filling and ring filling: a first layer of steel balls with corresponding diameters are thrown into the releasing core pipe (11) from a wellhead, the steel balls fall on the top of a ball seat (12) of a filling tool of the first layer, then liquid is injected into the releasing core pipe (11) from the wellhead, the pressure reaches 18 MPa or more, a packer (7) is sealed, the ball seat (12) moves downwards to a boss and stops, at the moment, the steel balls are located on the lower side of an inner filling hole, and the inner filling hole is opened; the inner wall of the layered water diversion joint (5) is provided with a sealed cavity which is matched with the closing or opening of the external filling hole through a sealed sliding sleeve (4), an upper circulating channel which is communicated up and down is arranged in the layered water distribution joint (5), the upper part of the layered water distribution joint is communicated with an annulus between the upper joint (6) of the filling tool and the releasing core pipe (11), the lower part of the layered water distribution joint is communicated with a lower circulating channel arranged in the lower joint (3) of the filling tool through a liquid conversion cavity, the releasing core pipe (11) passes through an inner filling hole, an outer filling hole, an annulus between the filling tool (10) and a sleeve, an annulus between the lower joint (3) of the filling tool and the releasing core pipe (11), a lower circulating channel of the lower joint (3) of the filling tool, a liquid conversion cavity and an upper circulating channel of the layered water distribution joint (5), and the annulus between the upper joint (6) of the filling tool and the releasing core pipe (11) forms a liquid circulating channel; at the moment, a sleeve valve of a wellhead is closed, a circulating channel of liquid is closed, sand carrying liquid is injected into a releasing core pipe (11), the pressure is gradually increased, sand is filled into an oil layer at the lowest layer of the oil well, ground filling is carried out until the set value of the filling pressure of the oil layer is reached, pressurizing is stopped, pressure diffusion is carried out, and ground filling is finished; opening a sleeve valve of a wellhead, opening a circulating channel of liquid, injecting sand carrying liquid into the releasing core pipe (11), gradually increasing the pressure, allowing the sand carrying liquid to flow out of the sleeve of the wellhead through the circulating channel of the liquid after the sand carrying liquid passes through a sand filtering pipe, settling sand in an annulus between the sleeve and the sand filtering pipe until the annulus is filled, and completing the annular filling of a first layer;

thirdly, performing second-layer ground filling and ring filling: a second layer of steel balls with corresponding diameters are thrown into the releasing core pipe (11) from the wellhead, the steel balls fall on the top of a ball seat (12) of a filling tool of the second layer, then liquid is injected into the releasing core pipe (11) from the wellhead, the pressure reaches 18 MPa or above, a packer (7) at the upper part of the filling tool of the second layer is sealed, the ball seat (12) moves downwards to a boss and stops, at the moment, the steel balls are located on the lower side of an inner filling hole of the filling tool of the second layer, the inner filling hole is opened, a downward channel of the releasing core pipe (11) is blocked, and the liquid enters a liquid circulation channel of the filling tool of the second layer;

at the moment, the sleeve valve of the wellhead is closed again, the circulating channel of the liquid of the second layer filling tool is closed, the sand carrying liquid is injected into the releasing core tube (11), the pressure is gradually increased, sand is filled into the oil layer of the second layer of the oil well, earth filling is carried out until the set value of the filling pressure of the oil layer is reached, the pressurizing is stopped, pressure diffusion is carried out, and the earth filling of the second layer is finished; opening a casing valve of the wellhead, opening a circulating channel of liquid, injecting sand carrying liquid into the releasing core pipe (11), gradually increasing the pressure, allowing the sand carrying liquid to pass through a sand filtering pipe, allowing the liquid to flow out of the casing of the wellhead through the circulating channel of the liquid of the filling tool of the second layer, settling sand in an annular space between the casing of the second layer and the sand filtering pipe until the second layer is filled completely, and completing annular filling of the second layer;

a plurality of snap rings (17) are arranged on the outer wall of the lower part of the inner pipe (14) of the compensator and are matched with the catcher (9) at the top of the releasing core pipe (11) of the next group of filling tools (10) through the snap rings of the inner pipe (14); a plurality of groups of horse teeth buckles corresponding to the snap rings are arranged in the catcher (9) and matched with the snap rings, and the snap rings are of round platform-shaped structures.

2. The method of constructing an oil workover tool according to claim 1, wherein: after the ground filling and the ring filling are finished, the releasing operation is carried out: a filling tool upper joint (6), a filling tool lower joint (3) and a layered water distribution joint (5) form a well-leaving pipe column, a releasing core pipe (11) is lifted up through a wellhead device, the releasing core pipe (11) drives a sealing sliding sleeve (4) to move upwards through a shear pin, when the releasing core pipe moves to a shear boss, the shear boss interacts with the top end of the sealing sliding sleeve (4), so that the shear pin is sheared, an outer filling hole is closed, and a sand-filtering pipe column formed by the well-leaving pipe column and a sand-filtering pipe is left at the position of a corresponding oil layer; the releasing core tube (11) drives the compensator, the ball seat and the steel ball to be lifted out of the well mouth, and releasing operation is completed.

3. The method of constructing an oil workover tool according to claim 1, wherein: and repeating the third step to realize three or more layers of layered filling and ring filling.

Technical Field

The invention relates to a construction method of an oil well repairing tool.

Background

The sand production and filling of the oil well are one of the problems which need to be solved urgently in oil field development, and the main reason of the sand production of the oil well is that an oil reservoir stratum is loose cemented sandstone. In addition, in the middle and later stages of oil field development, the reservoir framework can be greatly damaged due to long-term water injection or gas injection exploitation, and sand production of an oil well is caused. The sand production hazard of the oil well mainly represents three aspects: firstly, burying a production layer with sand to cause production reduction or production stop of an oil well; secondly, high-speed sand grains cause the accelerated abrasion of ground and underground equipment; and thirdly, sand production causes stratum to be voided and collapsed, so that a casing is damaged, an oil well is scrapped, and the like. The sand production of the oil well causes great reduction of the oil well yield, sharp increase of the operation cost and serious economic loss. In order to ensure normal production by sand production of oil wells, various sand control technologies including chemical sand control and filling technologies are widely researched and applied in various oil fields. At present, a common solution is to fill sand in the sand producing part of an oil well, so that the sand producing and empty stratum can be effectively filled, and the industry is also called ground filling; in addition, the annulus between the screen and the casing is preferably lined with sand, i.e., the stronger the wall, the more beneficial it is for later oil recovery, where the sand pack process is referred to in the industry as annular packing.

At present, most of filling tools are single-layer filling methods, and most of oil wells are in a state of a plurality of oil layers, so that the single-layer filling tools cannot meet the layered gravel filling of the oil layers, the single-layer filling tools are required to be used for filling a pipe column layer by layer one by one, and one multi-layer well needs to be subjected to pipe column construction for multiple times, so that the operation is complex, the construction is troublesome, the efficiency is low, and the production cost is increased greatly.

The Chinese patent document No. 1294337, entitled "separate layer extrusion filling sand control tubular column", is suitable for extrusion filling sand control process of multiple oil layers and also can be used for single oil layer. The packer comprises an inner filling pipe column and an outer filling pipe column, wherein the inner filling pipe column comprises a washing pipe and an inner filling tool, the outer filling pipe column comprises a top suspension packer, an outer filling tool and a sand filter pipe, and a filling opening is formed in the outer filling tool. The inner filling pipe column is provided with a setting releasing hand, and the outer filling pipe column is provided with an interlayer packer. When the setting releasing hand is pressed to enable the top suspension packer to be set, the setting releasing hand is separated from the top suspension packer, the inner filling pipe column can move up and down in the outer filling pipe column to set the interlayer packer, and the inner filling pipe column is matched with the outer filling tool to extrude and fill the stratum. Improving the sand control effect and the validity period. The next time of the pipe column can finish the construction of the layered extrusion filling sand prevention of a plurality of oil layers, thereby greatly reducing the production cost and the labor intensity of workers. However, there are problems in that: the invention adopts the inner filling pipe column and the outer filling pipe column which are in dynamic fit, and the two pipe columns move mutually and are not easy to position; in addition, the annular filling is carried out after the ground filling is finished, namely, if the ground filling is finished, a small amount of sand is certainly present between the inner filling pipe column and the outer filling pipe column if the ground filling is filled, and the problem that the small amount of sand is present mainly caused by the creeping of the spring is solved, so that the inner filling pipe column and the outer filling pipe column are difficult to move when the annular filling is carried out, even a channel cannot be opened, and a circulating channel for the annular filling cannot be established; if the sand is not packed, the ground packing does not achieve the desired packing effect. Therefore, the split design of the inner filling pipe column and the outer filling pipe column has the defects that the two designs are difficult to reconcile.

Disclosure of Invention

The invention aims to solve the defects in the prior art, provides a construction method of an oil workover tool, solves the problem that a single-layer filling tool cannot perform layered filling, also overcomes the problem that an inner filling pipe column and an outer filling pipe column in the existing design are difficult to move, simultaneously realizes oil-separated layer ground filling and annular filling, and improves the efficiency.

The invention provides a construction method of an oil well repairing tool, which adopts the technical scheme that the construction method comprises the following steps:

firstly, lower pipe column: a blind plug (27) is put into a casing of an oil well, then a sand filtering pipe (28) is put into the casing, the lower part of the sand filtering pipe (28) is connected with the blind plug (27), then a first group of filling tools (10) are put into the casing, the sand filtering pipe (28) is connected with the filling tools (10) through a lower joint (3) of the filling tools, and meanwhile, a catcher on the upper part of a releasing core pipe (11) is connected with a lower joint (2) of a releasing core pipe of a second group of filling tools (10) through a compensator; two or more groups of filling tools are formed by connecting in sequence, and a packer (7) is arranged at the upper part of each group of filling tools (10);

secondly, performing first-layer ground filling and ring filling: a first layer of steel balls with corresponding diameters are thrown into the releasing core pipe (11) from a wellhead, the steel balls fall on the top of a ball seat (12) of a filling tool of the first layer, then injecting liquid into the releasing core tube (11) from the well mouth, setting the packer (7) when the pressure reaches 18 MPa or more, moving the ball seat (12) downwards to the boss to stop, at the moment, the steel ball is positioned at the lower side of the inner filling hole, the inner filling hole is opened, a lower circulation channel of a lower joint (3) of a filling tool, an upper circulation channel of a layered water distribution joint (5), a liquid conversion cavity and an annular space between an upper joint (6) of the filling tool and the releasing core pipe (11) are formed by the releasing core pipe (11) passing through the inner filling hole, the outer filling hole, the annular space between the filling tool (10) and the sleeve, the annular space between the lower joint (3) of the filling tool and the releasing core pipe (11), and the annular space between the upper joint (6) of the filling tool and the releasing core pipe (11) is filled; at the moment, a sleeve valve of a wellhead is closed, a circulating channel of liquid is closed, sand carrying liquid is injected into a releasing core pipe (11), the pressure is gradually increased, sand is filled into an oil layer at the lowest layer of the oil well, ground filling is carried out until the set value of the filling pressure of the oil layer is reached, pressurizing is stopped, pressure diffusion is carried out, and ground filling is finished; opening a sleeve valve of a wellhead, opening a circulating channel of liquid, injecting sand carrying liquid into the releasing core pipe (11), gradually increasing the pressure, allowing the sand carrying liquid to flow out of the sleeve of the wellhead through the circulating channel of the liquid after the sand carrying liquid passes through a sand filtering pipe, settling sand in an annulus between the sleeve and the sand filtering pipe until the annulus is filled, and completing the annular filling of a first layer;

thirdly, performing second-layer ground filling and ring filling: a second layer of steel balls with corresponding diameters are thrown into the releasing core pipe (11) from the wellhead, the steel balls fall on the top of a ball seat (12) of a filling tool of the second layer, then liquid is injected into the releasing core pipe (11) from the wellhead, the pressure reaches 18 MPa or above, a packer (7) at the upper part of the filling tool of the second layer is sealed, the ball seat (12) moves downwards to a boss and stops, at the moment, the steel balls are located on the lower side of an inner filling hole of the filling tool of the second layer, the inner filling hole is opened, a downward channel of the releasing core pipe (11) is blocked, and the liquid enters a liquid circulation channel of the filling tool of the second layer;

at the moment, the sleeve valve of the wellhead is closed again, the circulating channel of the liquid of the second layer filling tool is closed, the sand carrying liquid is injected into the releasing core tube (11), the pressure is gradually increased, sand is filled into the oil layer of the second layer of the oil well, earth filling is carried out until the set value of the filling pressure of the oil layer is reached, the pressurizing is stopped, pressure diffusion is carried out, and the earth filling of the second layer is finished; opening a casing valve of the wellhead, opening a circulating channel of liquid, injecting sand carrying liquid into the releasing core pipe (11), gradually increasing the pressure, allowing the sand carrying liquid to pass through a sand filtering pipe, allowing the liquid to flow out of the casing of the wellhead through the circulating channel of the liquid of the filling tool of the second layer, settling sand in an annular space between the casing of the second layer and the sand filtering pipe until the second layer is filled completely, and completing annular filling of the second layer;

preferably, after the ground filling and the ring filling are finished, the releasing operation is carried out: a filling tool upper joint (6), a filling tool lower joint (3) and a layered water distribution joint (5) form a well-leaving pipe column, a releasing core pipe (11) is lifted up through a wellhead device, the releasing core pipe (11) drives a sealing sliding sleeve (4) to move upwards through a shear pin, when the releasing core pipe moves to a shear boss, the shear boss interacts with the top end of the sealing sliding sleeve (4), so that the shear pin is sheared, an outer filling hole is closed, and a sand-filtering pipe column formed by the well-leaving pipe column and a sand-filtering pipe is left at the position of a corresponding oil layer; the releasing core tube (11) drives the compensator, the ball seat and the steel ball to be lifted out of the well mouth, and releasing operation is completed.

Preferably, step three is repeated to realize three or more layers of filling and ring filling.

The invention has the beneficial effects that: firstly, the invention solves the problem that the existing single-layer packer can not pack in a layering way, overcomes the problem that the two pipe columns are difficult to connect, reduces the production cost and saves time and labor;

secondly, the invention adopts a plurality of groups of filling tools to be matched for use, realizes the layered filling of a plurality of oil layers, and the releasing core tube of each filling tool is matched with the well-remaining tubular column, when the oil layer is filled in the vacancy, the inner filling hole is opened through the matching of the steel ball and the ball seat, the inner filling hole is communicated with the outer filling hole, the liquid circulation channel is closed, and the filling is realized; when filling the annular space between the sleeve and the sand filter, the annular filling is realized by opening the liquid circulation channel; in addition, when a user releases the hand, the release core tube drives the annular sliding sleeve to move upwards, the shearing boss cuts the shearing nail, the sealing of the annular sliding sleeve and the inner filling hole is realized, and the annular sliding sleeve is matched with the inner filling hole, so that a spring in the prior art is cancelled, a small amount of sand caused by the creeping of the spring is prevented from settling, the filling hole is closed more reliably through the matching of the shearing nail and the sealing sliding sleeve, and the problem of failure in closing the filling hole is avoided;

thirdly, the compensator and the catcher are quickly connected, so that the pipe columns are quickly connected, the compensator can stretch out and draw back, construction is facilitated, and the operation efficiency is improved; in addition, the upper circulation channel in the upper joint of the filling tool can be well communicated with the lower circulation channel of the lower joint of the filling tool by designing the liquid conversion cavity, so that the mechanical manufacturing cost is reduced, and the communication between the upper circulation channel and the lower circulation channel is easy to complete;

in a word, the invention solves the problem that the existing single-layer filling tool can not perform layered filling, also solves the problem that the inner filling pipe column and the outer filling pipe column in the existing layered extrusion filling tool with split design are difficult to move due to a small amount of sand, avoids the problems of switch failure and inaccurate positioning, easily realizes layered filling and annular filling of a plurality of oil layers, can better realize annular filling by establishing a liquid circulation channel, improves the operation efficiency and reduces the cost.

Drawings

FIG. 1 is a schematic diagram of a set of filling tools of the present invention;

FIG. 2 is a schematic view of the filling tool after dropping a steel ball;

FIG. 3 is a schematic diagram of the structure of the compensator;

FIG. 4 is a schematic view of the configuration of the trap;

FIG. 5 is a schematic view of the construction of the lower joint of the filling tool;

FIG. 6 is a schematic illustration of a two-layer pack;

FIG. 7 is a schematic illustration of a three-layer pack;

in the upper diagram: the packer comprises a compensator 1, a lower joint 2 of a releasing core pipe, a lower joint 3 of a filling tool, a sealing sliding sleeve 4, a layered water-splitting joint 5, an upper joint 6 of the filling tool, a packer 7, a shearing boss 8, a catcher 9, a filling tool 10, a releasing core pipe 11, a ball seat 12, a sealing cavity 13, an inner pipe 14, a thread buckle 15, a horse teeth buckle 16, a snap ring 17, a shear pin 18, a liquid conversion cavity 19, a telescopic support ring 20, a support boss 21, a groove 22, an outer filling hole 23, an outer pipe 24, a pipe thread 25, a sealing ring 26, a blind plug 27, a sand filter pipe 28, a core pipe 29, a flushing pipe 30 and a steel ball 31.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.