阅读说明：本技术 一种利用锯齿型套铣鞋完成水平井套铣的方法 (Method for completing horizontal well casing milling by utilizing sawtooth type casing milling shoe ) 是由 庄具金 李军 向左明 刘红波 满振 于 2021-09-09 设计创作，主要内容包括：本发明属于油气田水平井铣井作业技术领域,具体涉及一种利用锯齿型套铣鞋完成水平井套铣的方法；包括两段同轴连接的套铣筒组成的变径式锯齿型套铣鞋,变径式锯齿型套铣鞋的小口端与套铣管连接、大口端设置一圈锯齿,套铣管采用旋转式下放管柱的方式,配合大排量正循环洗井,套铣完成后再下入打捞工具将井内落物捞出。本发明提供的一种利用锯齿型套铣鞋完成水平井套铣的方法,利用变径式锯齿型套铣鞋,将滤砂管柱周边的砂子等杂物套铣干净,实现了将滤砂管柱由卡埋状态转化为自由状态,给打捞解卡带来了方便。本发明的套铣方法操作简单,套铣效果好,可以更加有效地完成水平井被砂埋滤砂管柱的套铣施工。(The invention belongs to the technical field of well milling operation of horizontal wells of oil and gas fields, and particularly relates to a method for completing horizontal well casing milling by utilizing a sawtooth-shaped casing milling shoe; the variable-diameter sawtooth type milling shoe comprises two sections of coaxially connected milling sleeves, wherein a small opening end of the variable-diameter sawtooth type milling shoe is connected with a milling sleeve, a circle of sawtooth is arranged at a large opening end of the milling sleeve, the milling sleeve adopts a rotary type pipe column lowering mode to be matched with a large-displacement positive circulation well washing, and after the milling sleeve is finished, a fishing tool is put in to fish out the objects falling in the well. According to the method for completing the horizontal well casing milling by using the sawtooth-shaped casing milling shoe, provided by the invention, impurities such as sand and the like around the sand filtering pipe column are completely milled by using the variable-diameter sawtooth-shaped casing milling shoe, so that the sand filtering pipe column is converted into a free state from a blocking and burying state, and convenience is brought to salvaging and unfreezing. The casing milling method is simple to operate and good in casing milling effect, and can more effectively complete casing milling construction of the sand-filtered pipe column of the horizontal well buried by sand.)

1. A method for completing horizontal well casing milling by utilizing a sawtooth type casing milling shoe is characterized by comprising the following steps: the variable diameter sawtooth type milling shoe comprises two sections of coaxially connected sleeves, wherein shoulders are formed inside and outside the sleeves, a small opening end of the variable diameter sawtooth type milling shoe is connected with a milling sleeve, a circle of sawteeth are arranged at a large opening end of the milling sleeve, the milling sleeve adopts a rotary type pipe column lowering mode to be matched with a large-displacement positive circulation well washing, and a fishing tool is put into the milling sleeve to fish out objects falling in the well after the milling sleeve is finished.

2. The method for completing horizontal well casing milling by utilizing the sawtooth-shaped casing milling shoe according to claim 1 is characterized by comprising the following specific steps of:

1) preselecting a variable-diameter sawtooth type milling shoe with corresponding size according to the inner diameter of the milling pipe and the specifications of fish falling;

2) one end of the milling sleeve is welded with a preselected variable-diameter sawtooth type milling shoe, and the other end of the milling sleeve is welded with an upper joint matched with the button type specification of the drilling tool;

3) the variable diameter sawtooth type milling shoe is put into a well along with a drilling tool;

4) 3-5m above the fish, and opening a pump to wash the well in a positive circulation manner with large discharge capacity;

5) after the flow of the liquid returned from the well mouth is stable, starting the turntable, slowly lowering a drilling tool to perform milling construction by adopting drilling parameters of low drilling pressure and high rotating speed;

6) circularly milling a well, and lifting and lowering the movable pipe column for 1 time after 3-5m of milling is carried out;

7) rotating while moving the pipe column up and down without lifting the fish top, stirring oil sand in the well, matching with large-displacement circulating well washing, and cleaning impurities in the well;

8) after the sleeve milling pipe column is pulled out, the fishing pipe column is lowered for fishing, and the whole or part of the sand filtering pipe column in the well is fished out in a lifting or reversing way.

3. The method for completing horizontal well casing milling by utilizing the zigzag casing milling shoe according to claim 1, wherein the method comprises the following steps: the inner and outer chamfering treatment is carried out on the sawteeth of the variable diameter sawtooth type milling shoe.

4. The method for completing horizontal well casing milling by utilizing the zigzag casing milling shoe according to claim 2, wherein the method comprises the following steps: the drilling tool is an 18-degree slope drilling tool.

Technical Field

The invention belongs to the technical field of horizontal well milling operation of oil and gas fields, and particularly relates to a method for completing horizontal well milling by using a sawtooth type milling shoe.

Background

The horizontal well can improve the yield of a single well, improve the recovery ratio and reduce the comprehensive exploitation cost, is an important technical means for the efficient development of oil and gas fields, and is more and more widely applied in the middle and later stages of the development of the oil and gas fields. The horizontal well is easy to break down due to the particularity of well body tracks, and is high in well repairing frequency and difficulty. In recent years, the workload of fishing, filtering and preventing pipe columns in horizontal wells in a river clearing work area is gradually increased, the sand production amount of sand filtering pipe columns is increased year by year, the number of wells pulled up once is less and less, however, the sleeve milling and fishing means is single, the sleeve milling process requirement of loose strata in the river clearing work area is difficult to meet, and the problems of large potential safety hazard, low operability success rate, high operation labor intensity, long well occupation period and the like exist in a common sleeve milling barrel. Therefore, there is a need for improvements in the milling process and the milling tools to accommodate current trends.

The traditional horizontal well casing milling operation is carried out by the following steps: the poking-port type milling shoe and the milling pipe are welded together, under the premise of keeping circulation, a drilling tool is lowered to mill sand and other impurities around the sand filtering pipe in a sleeving manner, due to the uncertainty of the underground fish falling state, the corrosion severity of a sand filtering pipe column, the hardness of the sand after scaling is different, the success rate of the milling is low, and in the milling process, the iron sheet generated by sand setting or sand filtering pipe damage can be stuck to the drill, so that the horizontal well is salvaged with great difficulty. Therefore, a casing milling tool which is simple in operation, safe and reliable is developed, a matched casing milling process is improved, horizontal well casing milling operation is carried out, and the operation safety can be greatly improved.

Disclosure of Invention

The invention aims to provide a method for completing horizontal well casing milling construction by using a casing milling barrel made of a variable-diameter sawtooth type casing milling shoe, which is simple to operate, safe and reliable.

The invention provides the following technical scheme: a method for completing horizontal well casing milling by utilizing a sawtooth-shaped casing milling shoe comprises a reducing sawtooth-shaped casing milling shoe consisting of two sections of coaxially connected sleeves, wherein shoulders are formed inside and outside the sleeves, a small opening end of the reducing sawtooth-shaped casing milling shoe is connected with a casing milling pipe, a circle of sawteeth are arranged at a large opening end, the casing milling pipe adopts a rotary type pipe column lowering mode and is matched with a large-displacement positive circulation well washing, and after the casing milling is completed, a fishing tool is put in to fish out objects falling in a well.

Specifically, the sleeve milling specifically comprises the following steps:

1) preselecting a variable-diameter sawtooth type milling shoe with corresponding size according to the inner diameter of the milling pipe and the specifications of fish falling;

2) one end of the milling sleeve is welded with a preselected variable-diameter sawtooth type milling shoe, and the other end of the milling sleeve is welded with an upper joint matched with the button type specification of the drilling tool;

3) the variable diameter sawtooth type milling shoe is put into a well along with a drilling tool;

4) 3-5m above the fish, and opening a pump to wash the well in a positive circulation manner with large discharge capacity;

5) after the flow of the liquid returned from the well mouth is stable, starting the turntable, slowly lowering a drilling tool to perform milling construction by adopting drilling parameters of low drilling pressure and high rotating speed;

6) circularly milling a well, and lifting and lowering the movable pipe column for 1 time after 3-5m of milling is carried out;

7) rotating while moving the pipe column up and down without lifting the fish top, stirring oil sand in the well, matching with large-displacement circulating well washing, and cleaning impurities in the well;

8) after the sleeve milling pipe column is pulled out, the fishing pipe column is lowered for fishing, and the whole or part of the sand filtering pipe column in the well is fished out in a lifting or reversing way.

Furthermore, the inner and outer chamfering treatment is carried out on the sawteeth of the reducing sawtooth type milling shoe.

Further, the drilling tool is an 18-degree slope drilling tool.

Compared with the prior art, the invention has the advantages that:

according to the method for completing the horizontal well casing milling by using the sawtooth-shaped casing milling shoe, provided by the invention, impurities such as sand and the like around the sand filtering pipe column are completely milled by using the variable-diameter sawtooth-shaped casing milling shoe, so that the sand filtering pipe column is converted into a free state from a blocking and burying state, and convenience is brought to salvaging and unfreezing. The casing milling method is simple to operate and good in casing milling effect, and can more effectively complete casing milling construction of the sand-filtered pipe column of the horizontal well buried by sand.

Drawings

Fig. 1 is a schematic structural diagram of a variable diameter sawtooth-type milling shoe.

FIG. 2 is a schematic cross-sectional view of a variable diameter serrated milling shoe.

FIG. 3 is a schematic diagram of horizontal well sand screen pipe column casing milling.

In the figure: 1-variable diameter sawtooth type milling shoes; 2-oil layer casing; 3-a slope drill rod; 4, sleeving and milling a cylinder; 5-filtering and preventing the pipe from stringing columns.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings are only for the purpose of illustrating the technology of the invention and are not to be construed as representing actual proportions or actual shapes of products, wherein like reference numerals indicate identical or functionally similar elements.

In this context, "parallel", "perpendicular", and the like are not strictly mathematical and/or geometric limitations, but may also include tolerances as would be understood by one skilled in the art and allowed for in the manufacture or use of the product. In addition, "perpendicular" includes not only mutually perpendicular in which two objects are directly connected in space but also mutually perpendicular in which two objects are not connected in space.

As shown in fig. 1, 2, 3; a method for completing horizontal well casing milling by utilizing a sawtooth-shaped casing milling shoe comprises a reducing sawtooth-shaped casing milling shoe consisting of two sections of coaxially connected sleeves, wherein shoulders are formed inside and outside the sleeves, a small opening end of the reducing sawtooth-shaped casing milling shoe is connected with a casing milling pipe, a circle of sawteeth are arranged at a large opening end, the casing milling pipe adopts a rotary type pipe column lowering mode and is matched with a large-displacement positive circulation well washing, and after the casing milling is completed, a fishing tool is put in to fish out objects falling in a well.

Steps are formed inside and outside the reducing position of the milling shoe, and the sand control pipe column can be upwarped after the fish head climbs the steps, so that not only can the sand in the well be pried to be loosened, but also the sand control pipe column can conveniently enter the milling cylinder, and the milling can be smoothly completed; the sawtooth at the front end of the milling shoe plays a role in uniformly cutting the cemented oil sand at the bottom of the casing, so that the oil sand forms powder sand, and large-particle objects are prevented from causing drill sticking.

The inner and outer chamfers of the sawteeth of the reducing sawtooth type milling shoe are processed, and the inner wall of the outer chamfer protection sleeve of the sawteeth can not be seriously injured in the process of descending the tool into the well; in the sleeve milling process, the inner chamfer angle of the sawteeth protects the high-density filter tube column surface and the screen mesh from being torn, and iron objects are effectively prevented from being stacked to block a sleeve milling channel.

The sleeve milling comprises the following specific steps:

1) preselecting a variable-diameter sawtooth type milling shoe with corresponding size according to the inner diameter of the milling pipe and the specifications of fish falling;

2) one end of the milling sleeve is welded with a preselected variable-diameter sawtooth type milling shoe, and the other end of the milling sleeve is welded with an upper joint matched with the button type specification of the drilling tool;

3) the variable diameter sawtooth type milling shoe is put into a well along with an 18-degree slope drilling tool;

4) 3-5m above the fish, and opening a pump to wash the well in a positive circulation manner with large discharge capacity;

5) after the flow of the liquid returned from the well mouth is stable, starting the turntable, slowly lowering a drilling tool to perform milling construction by adopting drilling parameters of low drilling pressure and high rotating speed;

6) circularly milling a well, and lifting and lowering the movable pipe column for 1 time after 3-5m of milling is carried out;

7) rotating and moving the pipe column up and down under the condition of not lifting the fish top, stirring oil sand in the well, and quickly and fully cleaning impurities in the well in cooperation with large-displacement circulating well washing;

8) after the sleeve milling pipe column is pulled out, the fishing pipe column is lowered for fishing, and the whole or part of the sand filtering pipe column in the well is fished out in a lifting or reversing way.

The method is applied to the horizontal well, and utilizes the variable-diameter sawtooth-shaped milling shoe to mill the impurities such as sand and the like around the sand filtering pipe column completely, so that the sand filtering pipe column is converted from a blocking and burying state to a free state, and convenience is brought to salvaging and unfreezing. The horizontal well casing milling construction method is simple to operate, safe and reliable.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.