CN112796680B - Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well - Google Patents
Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well Download PDFInfo
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- CN112796680B CN112796680B CN202110003300.5A CN202110003300A CN112796680B CN 112796680 B CN112796680 B CN 112796680B CN 202110003300 A CN202110003300 A CN 202110003300A CN 112796680 B CN112796680 B CN 112796680B
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- casing
- sleeve
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- well
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention relates to a method for installing a protective casing of a pre-pumping ground well-to-mining well in a hanging manner, and belongs to the technical field of coal mine gas extraction. The method comprises determining a specification of a wellhead casing of the pre-pumping surface well; selecting and determining the specification of a protective sleeve; manufacturing a suspension installation device: cutting a switching sleeve from a sleeve with the same specification as a wellhead sleeve of the pre-pumping ground well, wherein the switching sleeve is provided with a thread which is matched with the thread of the connection end of the wellhead sleeve and can be in threaded connection with the wellhead sleeve, penetrating a protective sleeve through the switching sleeve, exposing the thread of the connection end of the protective sleeve out of the switching sleeve and fixedly connecting the thread of the connection end of the protective sleeve with the opposite end of the end where the thread of the switching sleeve is located, so as to form a suspended installation device of the protective sleeve; the protective casing is lowered by hanging the installation device. The method is simple and convenient to operate, and aims to transform the pre-pumping ground well into the mining well, extract gas in a mining area, expand the application range of the gas extraction technology of the ground well, provide technical support for realizing multiple purposes of one well and lay a necessary foundation.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and relates to a suspension installation method for a protective casing of a pre-pumping ground well-to-mining well.
Background
Gas is one of major disasters and potential safety hazards of coal mines, and gas control in the coal mining process is the key point for guaranteeing coal mine safety production. The pre-pumping ground well is scrapped after gas drainage in the pre-pumping stage is completed, the pre-pumping ground well is changed into a ground well in a mining area so that gas extraction can be carried out in a mining pressure relief area, and the pre-pumping ground well is changed into the ground well in the mining area so that the accurate and effective suspension of the well mouth of the ground well can influence the extraction effect of the ground well. The pre-pumping ground well modified mining area expands the application range of the ground well gas extraction technology, improves the gas extraction efficiency, assists in solving the problem of gas emission of the coal face, and provides technical support for the popularization of the ground well gas extraction technology with one well for multiple purposes. Therefore, there is a need to explore techniques for modifying a pre-pumped surface well into a production well.
Disclosure of Invention
In view of the above, the present invention provides a method for installing a protective casing of a pre-pumping ground well to a mining well in a suspended manner, so as to solve the problem of installing the protective casing in the suspended manner when the pre-pumping ground well is transformed into the mining well.
In order to achieve the purpose, the invention provides the following technical scheme:
the hanging installation method of the protective casing of the pre-pumping ground well-to-mining well comprises the following steps:
s1, determining the specification of a wellhead casing of a pre-pumping ground well:
the method comprises the following steps of performing on-site investigation on the outer diameter and the wall thickness of a wellhead casing of the pre-pumping ground well and the type and the model of a thread of a connecting end;
calculating the inner diameter of a wellhead casing of the pre-pumping ground well, wherein the calculation formula is c = a-2b, c is the inner diameter of the wellhead casing, a is the outer diameter of the wellhead casing, and b is the wall thickness of the wellhead casing;
s2, selecting and determining the specification of the protective sleeve: including the outside diameter, the wall thickness and the thread type and model of the connecting end; wherein the content of the first and second substances,
the outer diameter of the protective sleeve: the calculation formula is a1(= c-1: (h/100) × 2), wherein a1The outer diameter of the protective casing, c the inner diameter of the wellhead casing of the pre-pumping ground well, h the coal bed burial depth and the quotient of h/100 is rounded upwards;
the wall thickness of the protective casing is more than 1.5 times of that of the pre-pumping ground well mouth casing;
the strength or rigidity of the protective casing is more than 1.5 times of that of the pre-pumping ground well mouth casing;
the protective casing has no coupling;
s3, manufacturing a suspension installation device:
cutting a section of casing pipe with the same specification as a wellhead casing pipe of the pre-pumping ground well to serve as a transfer casing pipe, wherein one end of the transfer casing pipe is provided with a thread which is matched with the thread of the connection end of the wellhead casing pipe and can be in threaded connection with the wellhead casing pipe;
inserting the protective sleeve into the adapter sleeve, exposing the thread of the connecting end of the protective sleeve outside the adapter sleeve, and fixedly connecting the thread of the connecting end of the protective sleeve with the opposite end of the end where the thread of the adapter sleeve is located to form a suspended installation device of the protective sleeve; the tensile resistance of the fixed connection part is more than 1.5 times of the gravity of the protective sleeve;
s4, lowering a protective sleeve:
calculating the lowering length of the protective casing to the pre-pumping ground well, connecting the suspension installation device with the protective casing one by one through the reducing diameter connected with a ground drilling machine, and lowering to a set position; at the moment, the suspension installation device is positioned on the wellhead of the pre-pumping ground well, and the end of the adapting sleeve where the thread is located faces downwards;
and connecting the thread of the switching sleeve suspending the installing device with the thread of the well mouth sleeve connecting end through a ground drilling machine, and then disconnecting the thread of the protective sleeve connecting end welded by the suspending installing device by the ground drilling machine to complete the suspension installation of the protective sleeve.
And further, selecting the standard petroleum casing pipe specification closest to the calculated outer diameter of the protective casing pipe.
Further, when the outer diameter of the protective sleeve is determined, the annular distance of more than 1mm is reserved for every 100m of length.
Furthermore, when the suspension installation device is manufactured, the mode that the threads of the connecting end of the protective sleeve are fixedly connected with the opposite end of the end, where the threads of the switching sleeve are located, is welding.
The invention has the beneficial effects that:
the method for hanging and installing the protective casing of the pre-pumping ground well-to-mining well is simple and convenient to operate, the adaptive protective casing is reasonably selected according to the actual situation of the existing pre-pumping ground well, and the protective casing is conveniently put into the pre-pumping ground well through the hanging and installing device which is simple in structure and easy to manufacture, so that technical support is provided for changing the pre-pumping ground well into the mining well for gas extraction in a mining area, the application range of the gas extraction technology of the ground well is expanded, multiple purposes of one well are realized, and necessary foundation is laid.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural view of a suspension installation device of embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a suspension installation device of embodiment 2 of the present invention.
Reference numerals: well head sleeve pipe 1, well head sleeve pipe link's screw thread 2, protection sleeve pipe 3, adapter sleeve pipe's screw thread 4, adapter sleeve pipe 5, protection sleeve pipe link's screw thread 6.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a method for installing a protective casing of a pre-pumping ground well to a mining well in a hanging manner includes the following steps:
s1, determining the specification of a wellhead casing 1 of the pre-pumping ground well:
the external diameter and the wall thickness of a wellhead casing 1 of the pre-pumping ground well and the type and the model of the thread of the connecting end are examined on site;
calculating the inner diameter of a wellhead casing 1 of the pre-pumping ground well, wherein the calculation formula is c = a-2b, c is the inner diameter of the wellhead casing 1, a is the outer diameter of the wellhead casing 1, and b is the wall thickness of the wellhead casing 1;
typically, the entry casing used for pre-pumped surface wells is a standard petroleum casing, such as 139.7mm outside diameter, 7.72mm wall thickness, steel grade J55 casing, with an inside diameter of c = a-2b =139.7-7.72 x 2=124.26 mm. In this embodiment, the type of thread 2 at the wellhead casing connection end is an internal thread.
S2, selecting and determining the specification of the protective sleeve 3: including the outside diameter, the wall thickness and the thread type and model of the connecting end; wherein the content of the first and second substances,
outer diameter of the protective sleeve 3: the calculation formula is a1(= c-1: (h/100) × 2), wherein a1The outer diameter of a protective casing 3 is adopted, c is the inner diameter of a wellhead casing 1 of the pre-pumping ground well, h is the buried depth of the coal bed, and the quotient of h/100 is the minimum integer larger than the theoretical value; for example, 124.26-1 (325/100) 2= 116.26mm, the quotient of 325/100 is the smallest integer 4 greater than its theoretical value; thus, when the outer diameter of the protective casing 3 is determined, the annular distance of more than 1mm is reserved for every 100m of length;
the wall thickness of the protective casing 3 is 1.5-2 times of that of the pre-pumping ground well wellhead casing 1;
the strength or rigidity of the protective casing 3 is 1.5-3 times that of the pre-pumping ground well wellhead casing 1;
the protective sleeve 3 has no coupling;
and selecting the standard petroleum casing specification closest to the calculated outer diameter of the protective casing 3 according to the calculated outer diameter, and selecting the protective casing 3 with the outer diameter of 114.3mm, the wall thickness of 12.7mm and the steel grade P110 based on the existing standard.
S3, manufacturing a suspension installation device:
a section of casing pipe with the same specification as the wellhead casing pipe 1 of the pre-pumping ground well is cut out to be used as a switching casing pipe 5, one end of the switching casing pipe 5 is provided with a thread which is matched with the thread 2 of the connection end of the wellhead casing pipe and can be in threaded connection with the wellhead casing pipe, namely, the thread 4 of the switching casing pipe is an external thread;
inserting the protective sleeve 3 into the adapter sleeve 5, exposing the thread 6 of the protective sleeve connecting end out of the adapter sleeve 5, and accurately welding the protective sleeve 3 with the opposite end of the end where the thread 4 of the adapter sleeve is located to form a suspended installation device of the protective sleeve 3; the tensile resistance of the welding position is 1.5-3 times of the gravity of the protective sleeve 3; the type of the thread 6 for protecting the connecting end of the casing pipe is an internal thread;
s4, lowering a protective sleeve 3:
calculating the lowering length of the protective casing 3 to the pre-pumping ground well, connecting the suspension installation device with the protective casing 3 one by one through the reducing of the ground drilling machine, and lowering to a set position; at the moment, the suspension installation device is positioned on the wellhead of the pre-pumping ground well, and the end of the thread 4 of the adapter sleeve is downward;
and connecting the thread 4 for hanging the switching sleeve of the installing device with the thread 2 at the connecting end of the wellhead sleeve by a ground drilling machine, and then disconnecting the thread 6 for hanging the connecting end of the protective sleeve welded by the installing device by the ground drilling machine to finish the hanging and installing of the protective sleeve 3.
Example 2:
referring to fig. 2, the difference between embodiment 2 and embodiment 1 is that the threads 2 of the wellhead casing connection end are of the external thread type, and correspondingly, the threads 4 of the adapter casing are of the internal thread type.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. The hanging installation method of the protective casing of the pre-pumping ground well-to-mining well is characterized by comprising the following steps: the method comprises the following steps:
s1, determining the specification of a wellhead casing of a pre-pumping ground well:
the method comprises the following steps of performing on-site investigation on the outer diameter and the wall thickness of a wellhead casing of the pre-pumping ground well and the type and the model of a thread of a connecting end;
calculating the inner diameter of a wellhead casing of the pre-pumping ground well, wherein the calculation formula is c = a-2b, c is the inner diameter of the wellhead casing, a is the outer diameter of the wellhead casing, and b is the wall thickness of the wellhead casing;
s2, selecting and determining the specification of the protective sleeve: including the outside diameter, the wall thickness and the thread type and model of the connecting end; when the outer diameter of the protective casing is determined, reserving an annular distance of more than 1mm per 100m of length; wherein, the first and the second end of the pipe are connected with each other,
the outer diameter of the protective sleeve: the calculation formula is a1(= c-1: (h/100) × 2), wherein a1The outer diameter of the protective casing, c the inner diameter of the wellhead casing of the pre-pumping ground well, h the coal bed burial depth and the quotient of h/100 is rounded upwards;
the wall thickness of the protective casing is more than 1.5 times of that of the pre-pumping ground well mouth casing;
the strength or rigidity of the protective casing is more than 1.5 times of that of the pre-pumping ground well mouth casing;
the protective casing has no coupling;
s3, manufacturing a suspension installation device:
cutting a section of casing pipe with the same specification as a wellhead casing pipe of the pre-pumping ground well to serve as a transfer casing pipe, wherein one end of the transfer casing pipe is provided with a thread which is matched with the thread of the connection end of the wellhead casing pipe and can be in threaded connection with the wellhead casing pipe;
inserting the protective sleeve into the adapter sleeve, exposing the thread of the connecting end of the protective sleeve outside the adapter sleeve, and fixedly connecting the thread with the opposite end of the end where the thread of the adapter sleeve is located to form a suspended installation device of the protective sleeve; the tensile resistance of the fixed connection part is more than 1.5 times of the gravity of the protective sleeve;
s4, lowering a protective sleeve:
calculating the lowering length of the protective casing to the pre-pumping ground well, connecting the suspension installation device with the protective casing one by one through the reducing diameter connected with a ground drilling machine, and lowering to a set position; at the moment, the suspension installation device is positioned on the wellhead of the pre-pumping ground well, and the end of the adapting sleeve where the thread is located faces downwards;
and connecting the thread of the switching sleeve suspending the installing device with the thread of the well mouth sleeve connecting end through a ground drilling machine, and then disconnecting the thread of the protective sleeve connecting end welded by the suspending installing device by the ground drilling machine to complete the suspension installation of the protective sleeve.
2. The method of claim 1, wherein the method further comprises: and selecting the standard petroleum casing pipe specification closest to the calculated outer diameter of the protective casing pipe.
3. The method of claim 1, wherein the method further comprises: when the suspension installation device is manufactured, the mode that the threads of the connecting end of the protective sleeve are fixedly connected with the opposite end of the end, where the threads of the switching sleeve are located, is welding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110003300.5A CN112796680B (en) | 2021-01-04 | 2021-01-04 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
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| CN202110003300.5A CN112796680B (en) | 2021-01-04 | 2021-01-04 | Suspension installation method for protecting casing pipe of pre-pumping ground well to mining well |
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