CN110748319A - Shale gas well casing deformation prevention well cementation method - Google Patents
Shale gas well casing deformation prevention well cementation method Download PDFInfo
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- CN110748319A CN110748319A CN201910966473.XA CN201910966473A CN110748319A CN 110748319 A CN110748319 A CN 110748319A CN 201910966473 A CN201910966473 A CN 201910966473A CN 110748319 A CN110748319 A CN 110748319A
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The invention discloses a shale gas well casing deformation prevention well cementation method, which comprises the following steps: drilling a well, wherein a casing variable section determined according to a preset mode in a shale gas well is drilled through in the drilling process; connecting a layer-winding well cementation device to a sleeve, wherein two packers which are arranged at intervals and can expand outwards are arranged on the layer-winding well cementation device; running the casing, and enabling the packers to be respectively positioned at the upper boundary of the top part and the lower boundary of the bottom part of the sleeve-variable section; pumping drilling fluid into the casing with the bottom in a closed state, expanding the packer after pressure is suppressed, and continuing pumping the drilling fluid into the casing until the bottom of the casing is opened; and injecting cement slurry into the annular space between the casing and the well wall, wherein the cement slurry is injected into the annular space outside the easily-sleeved variable section, and the annular space of the easily-sleeved variable section does not contain the cement slurry. The casing pipe deformation prevention device can better prevent the casing pipe in the shale gas well from deforming.
Description
Technical Field
The invention relates to the technical field of shale gas well completion engineering, in particular to a shale gas well casing deformation prevention well cementation method.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the existing exploitation process of shale gas wells, the problem that shale gas well casings deform seriously is common. According to data statistics, as long as 2018 and 10 months later, the Changning-Weiyuan block co-fractures 195 shale gas wells, wherein 89 wells are subjected to casing deformation and account for 46%. In Changning block, 29 wells of 91 wells underwent casing change, accounting for 31.9%. The total number of the completed fracturing wells in 2018 is 30, 13 fracturing wells (7 dense cutting wells) are subjected to casing deformation, and the casing deformation rate reaches 43%. In the Weiyuan 202 block, 43 well casings of 53 wells are deformed, accounting for 81 percent. And 17 wells of 51 wells in the Weiyuan 204 block are subjected to casing deformation, and the percentage of the 17 wells is 33.3%. Overall, casing deformation severely impacts shale gas well productivity. Taking 57 wells drilled in the Wenqing block in Chuqing as an example, the converted length of the deformed lost section of the casing reaches 9221 meters, which is equivalent to the horizontal section length of a standard well with 6 wells. If the yield per well is 0.8 million square, which is equivalent to affecting the final gas production of 4.8 million square, the production is distributed to all 57 wells, and the yield per well is affected by 842 ten thousand square.
The research finds that: the shale gas horizontal well casing deformation is represented by necking phenomenon caused by external extrusion or shearing, and is basically characterized by being induced by shale layer slippage along weak planes such as faults, cracks, bedding and the like. The source power is two modes of fracturing fluid injection into the shale formation lifting and weak surface sliding. The casing deformation mode caused by shale layer expansion/lifting is characterized in that a large amount of fracturing fluid and propping agent enter a stratum, the stratum expands and lifts, natural cracks or interlayer sliding is caused to cause shearing casing deformation, and meanwhile, the interlayer sliding is caused due to different arching radiuses when the stratum lifts, so that the casing is deformed. And the shale fracture/fault slippage induced casing deformation mode is represented as follows: when the stratum is expanded/lifted and meets natural cracks, the natural cracks are excited to slide when the shearing force reaches a critical value, and the casing is deformed. If fracturing fluid enters the natural cracks in the process, the pore pressure in the cracks is improved, the viscosity-slip coefficient of the cracks is reduced, the natural cracks are more easily excited to slide, and the deformation of the sleeve is aggravated. Casing deformation occurs mainly in the middle and rear of the fracture zone, in formations with fractures/faults and lithologic interfaces/bedding, and in formations with good cementing quality. Wherein the excellent rate of the well cementation quality and the casing deformation show obvious positive correlation.
Based on the research, combining with the mechanical analysis of the tubular column, the experts at home and abroad put forward a series of countermeasures and suggestions for preventing the shale gas well casing deformation, which comprises the following steps: improving the wall thickness and the strength of the casing pipe, optimizing the performance of the set cement and the like. However, high grade steel and wall thickness sleeves (Q125, etc.) are now commonly used in the chaning-wife block, and the sleeve rate is still very high. And practice shows that: increasing the strength of the casing (thick-walled casing, double-walled casing, etc.) has little effect on relieving casing damage caused by rock stratum slippage, whereas reducing the rigidity of the casing and the cement sheath near the slippage surface can relieve casing deformation. Meanwhile, experiments and a number of model theories show that the shearing damage of the casing is difficult to solve by changing the performance of the set cement.
Therefore, a new shale gas well casing-deformation-preventing cementing method is needed to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a cementing method for preventing casing deformation of a shale gas well, which can better prevent a casing in the shale gas well from deforming.
The application embodiment discloses a shale gas well casing deformation prevention well cementation method, which comprises the following steps:
drilling a well, wherein a casing variable section determined according to a preset mode in a shale gas well is drilled through in the drilling process;
connecting a layer-winding well cementation device to a sleeve, wherein two packers which are arranged at intervals and can expand outwards are arranged on the layer-winding well cementation device;
running the casing, and enabling the packers to be respectively positioned at the upper boundary of the top part and the lower boundary of the bottom part of the sleeve-variable section;
pumping drilling fluid into the casing with the bottom in a closed state, expanding the packer after pressure is suppressed, and continuing pumping the drilling fluid into the casing until the bottom of the casing is opened;
and injecting cement slurry into the annular space between the casing and the well wall, wherein the cement slurry is injected into the annular space outside the easily-sleeved variable section, and the annular space of the easily-sleeved variable section does not contain the cement slurry.
In a preferred embodiment, the set-susceptible segment comprises: the method comprises the steps of fracturing a fracture initiation section, a fault and lithology interface and a bedding section, wherein the fault and lithology interface and the bedding section are identified according to geological data and logging data.
In a preferred embodiment, the number of the layer-surrounding cementing devices is the same as that of the easy-to-sleeve sections.
In a preferred embodiment, the bottom of the casing is provided with a pressure control check valve, the pressure control check valve comprises a valve ball and a pin for fixing the valve ball, when the pressure of the drilling fluid in the casing is greater than the shearing force of the pin, the pin is sheared, the valve ball is disengaged, and the bottom of the casing is opened.
In a preferred embodiment, an anti-backflow check valve is further arranged at the bottom of the sleeve, and the pressure control check valve is arranged at the bottom of the anti-backflow check valve.
In a preferred embodiment, a flow channel for circulating cement slurry is arranged in the surrounding layer cementing device, and when the cement slurry ascends in an annular space between the casing and the well wall and reaches the packer, the cement slurry can continuously flow upwards through the flow channel and enter the annular space between the casing and the well wall at the upper part of the packer.
In a preferred embodiment, the length of the casing cementing device is greater than the thickness of the casing-susceptible segment corresponding thereto.
In a preferred embodiment, the number of the sections easy to set is multiple, the packer is correspondingly arranged on each section easy to set, and the packers are sequentially set from bottom to top.
In a preferred embodiment, during drilling, a drill bit with a predetermined diameter is used to form an open hole wellbore with a predetermined bore diameter, the open hole wellbore passing through the casing susceptible section to form a predetermined annulus with a predetermined size with the surrounding cementing device.
The invention has the characteristics and advantages that: according to the shale gas well casing deformation prevention well cementation method provided by the embodiment of the application, the packer and the layer-winding well cementation device are additionally arranged at the height position matched with the casing, due to the existence of the packer, cement slurry cannot return from the annular space between the layer-winding well cementation device and the well wall, and only can flow from the cement slurry flow channel inside the layer-winding well cementation device, so that the cement is not filled in the annular space between the layer-winding well cementation device and the well wall of the easy casing deformation layer during well cementation, a space is reserved for stratum sliding, the casing is not contacted when the stratum slides, and the casing is protected within a certain range.
Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
FIG. 1 is a flow chart of steps of a shale gas well casing deformation prevention cementing method provided in an embodiment of the present application;
fig. 2 is a schematic view of a cementing apparatus provided in an embodiment of the present application within a wellbore.
Description of reference numerals:
1. easily sleeving and changing sections; 2. an open hole wellbore; 3. a sleeve; 4. a packer; 5. a layer-winding cementing device; 6. a cement sheath; 7. a cement slurry flow channel; 8. a predetermined annulus.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the conventional well cementation, a casing and a stratum are consolidated together through a cement sheath, cement is filled in an annular space between a well wall and the casing, and the casing is directly driven to deform after the stratum slips.
The shale gas well casing deformation prevention well cementation method provided by the application specification mainly comprises the following steps: and bypassing the casing variable layer section in the well cementation process, namely not cementing the casing variable layer section, so that a predetermined annular space (a predetermined annulus for short) is formed between the well wall of the casing variable layer section and the casing. The preset annular part measured between the well wall and the casing pipe provides certain buffering for casing pipe deformation, prevents casing pipe deformation, and facilitates smooth fracturing production increasing measures. Wherein, easily cover and become the lamination section and mainly include: fracture initiation, fault and lithologic interfaces, bedding sections, and the like.
Overall, the shale gas well casing deformation prevention well cementation method provided by the application does not cement a section of a casing which is easy to casing and deform, when the preset annular space of a well wall and a casing is not filled with cement, the casing and a stratum are not solidified together, when the stratum slides, the existence of the annular space is equivalent to form a safety margin, and if the sliding degree of the stratum does not exceed the safety margin, the casing is not influenced.
The embodiment of the invention provides a cementing method for a shale gas well, which can better prevent a casing in the shale gas well from deforming.
As shown in fig. 1 and fig. 2, the shale gas well casing cementation preventing method provided in the embodiment of the present specification mainly includes the following steps:
step S10: drilling a well, wherein a casing variable section 1 determined according to a preset mode in a shale gas well is drilled through in the drilling process;
step S12: connecting a layer-winding well cementation device 5 to a casing 3, wherein two packers 4 which are arranged at intervals and can expand outwards are arranged on the layer-winding well cementation device 5;
step S14: running the casing 3, and respectively locating the packers 4 at the upper boundary of the top and the lower boundary of the bottom of the casing-variable section 1;
step S16: pumping drilling fluid into the casing 3 with the bottom in a closed state, holding pressure, expanding the packer 4, continuing pumping drilling fluid into the casing 3, and holding pressure until the bottom of the casing 3 is opened;
step S18: and injecting slurry into an annular pump between the casing pipe 3 and the well wall, wherein the cement slurry is injected into the annular space outside the easily-sleeved variable section 1, and the annular space of the easily-sleeved variable section does not contain the cement slurry.
The following is an example with reference to specific implementation steps.
In the embodiment, during the drilling process, a drill bit with a predetermined diameter is used to form an open hole wellbore 2 with a predetermined aperture, and the open hole wellbore 2 passes through the casing-susceptible section 1 to form a predetermined annulus 8 with the surrounding cementing device 5. For example, when the diameter of the drill bit is 215.9mm, the bore diameter of the open hole wellbore 2 is 215.9mm, and the outer diameter of the layer-surrounding cementing device 5 is 177.8 mm; the predetermined annulus 8 has a single-sided width of 19.05 mm.
The purpose of drilling through the casing-variable section 1 of the shale gas well is to enable a packer 4 to be lowered to the bottom of the casing-variable section 1 to pack the whole casing-variable section 1. The set-changeable segment 1 may include: fracture initiation section, fault and lithologic interface and bedding section. Wherein, the easily-changed sections 1 of the fault, the lithologic interface and the bedding section can be identified according to geological data and logging data. Wherein the fracture initiation section can be preset.
The easily-sleeved variable sections 1 such as fault, lithologic interface and bedding section can be identified according to geological data and logging data, and the fracture initiation section can be preset.
In the present embodiment, a plurality of the above-described layer-surrounding cementing apparatuses 5 may be installed on the casing 3 to cement a plurality of easily casing-variable zones in the same well. Specifically, the number of the layer-winding cementing devices 5 can be determined according to the number of the easy casing layer sections. The number of the layer-winding well cementation devices 5 is the same as that of the layer sections easy to sleeve and change. For example, in some embodiments, the number of the variable easy-set sections 1 may be multiple, the packer 4 is correspondingly arranged in each variable easy-set section 1, and the packers 4 are sequentially set from bottom to top. Each packer 4 may have the same setting pressure. When each packer 4 has the same setting pressure, the packer 4 at the lowest part of the casing 3 first reaches the setting pressure with the injection of the drilling fluid, thus completing the setting first; the packer 4, which is located uppermost in the casing 3, reaches the setting pressure last, and thus the setting is completed last.
Here, one cementing apparatus is provided as an example, and other scenarios in which a plurality of cementing apparatuses are provided may be provided with reference to the embodiment of one cementing apparatus.
The length of the layer-winding cementing device 5 needs to be larger than the thickness of the easy-deformation section 1. The zonal cementing device 5 has two packers 4 arranged at intervals and capable of expanding outwards. After the drilling fluid is suppressed in the casing 3, the packer 4 is expanded to prop against the wall of the shaft, so that a sealed space is formed by a preset annular space 8 at the top and the bottom of the shale gas casing deformation section 1. The expanded packers 4 are capable of blocking the cement slurry from entering the predetermined annulus 8 between the two packers 4. The layer-winding well cementation device 5 is hollow, a cement slurry flow channel communicated with the external annular space of the two packers 4 is formed, and finally a cement sheath 6 is formed at the position except the easy-casing deformation section 1, so that the casing can be protected while well cementation is realized.
The bottom of the casing 3 is provided with a pressure control one-way valve, the pressure control one-way valve comprises a valve ball and a pin for fixing the valve ball, when the pressure of the drilling fluid in the casing 3 is greater than the shearing force of the pin, the pin is sheared, the valve ball is disengaged, and the bottom of the casing 3 is opened.
And an anti-backflow check valve is also arranged at the bottom of the sleeve 3. The pressure control one-way valve is arranged at the bottom of the backflow prevention one-way valve. The anti-reverse flow one-way valve enables the drilling fluid in the casing 3 to flow out of the casing 3, but can not flow into the casing 3 from the bottom of the casing 3 in the reverse direction. When the pressure of the drilling fluid in the casing 3 reaches a specified value, the pressure control one-way valve can be disconnected from the anti-backflow one-way valve. When the pressure control one-way valve is separated from the anti-backflow one-way valve, drilling fluid or cement slurry in the casing 3 can enter a shaft, and liquid in the shaft cannot reversely enter the casing 3 from the bottom of the casing 3.
In the present embodiment, a flow passage for circulating cement slurry is provided in the casing cementing device 5. When the cement slurry flows upwards in the annular space between the casing 3 and the well wall to reach the packer 4, the cement slurry can continuously flow upwards through the cement slurry flow channel 7 and enter the annular space between the casing 3 and the well wall at the upper part of the packer 4.
In a specific application scenario, the shale gas well casing deformation prevention cementing method provided by the application can specifically execute the following steps:
(1) drilling a phi 215.9mm drill bit through a shale gas well casing deformation section 1;
(2) connecting a phi 177.8mm surrounding layer cementing device 5 and a packer 4 to a casing 3;
(3) a sleeve 3 with the diameter of 139.7mm is put into a shaft, and a packer 4 is positioned at the upper boundary of the top and the lower boundary of the bottom of the casing-variable section 1;
(4) pumping drilling fluid into the sleeve 3 with the bottom in a closed state, building pressure, and expanding the packer 4;
(5) continuously pumping drilling fluid into the casing 3, and building pressure until a one-way valve at the bottom of the casing 3 is opened;
(6) pumping cement slurry according to a conventional well cementation process, wherein the cement slurry enters a cement slurry flow channel 7 in the layer-winding well cementation device 5 when passing through the layer-winding well cementation device 5;
(7) after the cement injection is finished, the cement slurry can be filled in the cement slurry flow channel 7, and the preset annular space 8 with the diameter of 19.05mm formed between the open hole with the diameter of 215.9mm and the surrounding layer cementing device 5 with the diameter of 177.8mm is not filled with the cement, so that the damage of the stratum slippage to the casing 3 is relieved.
According to the shale gas well casing deformation prevention well cementation method provided by the invention, the packer 4 and the winding layer well cementation device 5 are additionally arranged at the height position matched with the casing 3, due to the existence of the packer 4, cement slurry cannot return from the annular space between the winding layer well cementation device 5 and a well wall, and only can flow from the cement slurry flow channel 7 in the winding layer well cementation device 5, so that cement is not filled in the annular space between the winding layer well cementation device 5 and the well wall easy to casing deformation during well cementation, a space is reserved for stratum sliding, and the casing 3 is not contacted when the stratum slides, so that the casing 3 is protected within a certain range.
Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.
Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.
All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.
A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A shale gas well casing deformation prevention well cementation method is characterized by comprising the following steps:
drilling a well, wherein a casing variable section determined according to a preset mode in a shale gas well is drilled through in the drilling process;
connecting a layer-winding well cementation device to a sleeve, wherein two packers which are arranged at intervals and can expand outwards are arranged on the layer-winding well cementation device;
running the casing, and enabling the packers to be respectively positioned at the upper boundary of the top part and the lower boundary of the bottom part of the sleeve-variable section;
pumping drilling fluid into the casing with the bottom in a closed state, expanding the packer after pressure is suppressed, and continuing pumping the drilling fluid into the casing until the bottom of the casing is opened;
and injecting cement slurry into the annular space between the casing and the well wall, wherein the cement slurry is injected into the annular space outside the easily-sleeved variable section, and the annular space of the easily-sleeved variable section does not contain the cement slurry.
2. The shale gas well casing deformation prevention cementing method of claim 1, wherein the casing deformation prone section comprises: the method comprises the steps of fracturing a fracture initiation section, a fault and lithology interface and a bedding section, wherein the fault and lithology interface and the bedding section are identified according to geological data and logging data.
3. The shale gas well casing deformation prevention well cementation method of claim 1, wherein the number of the layer-winding well cementation devices is the same as the number of the easy casing deformation sections.
4. The shale gas well casing cementation method of claim 3, wherein the bottom of the casing is provided with a pressure control check valve, the pressure control check valve comprises a valve ball and a pin for fixing the valve ball, when the pressure of the drilling fluid in the casing is greater than the shearing force of the pin, the pin is sheared, the valve ball is disengaged, and the bottom of the casing is opened.
5. The shale gas well casing deformation prevention cementing method as claimed in claim 4, characterized in that an anti-backflow check valve is further arranged at the bottom of the casing, and the pressure control check valve is arranged at the bottom of the anti-backflow check valve.
6. The shale gas well casing deformation prevention cementing method of claim 5, wherein a flow passage for circulating cement slurry is arranged in the casing cementing device, and when the cement slurry ascends in an annular space between a casing and a well wall to reach the packer, the cement slurry can continuously flow upwards through the flow passage of the cement slurry and enter the annular space between the casing and the well wall at the upper part of the packer.
7. The shale gas well casing deformation prevention cementing method of claim 2, wherein the length of the casing cementing device is greater than the thickness of the casing deformation prone section corresponding to the casing cementing device.
8. The shale gas well casing change prevention well cementation method as claimed in claim 7, wherein the number of the sections easy to casing change is multiple, the packer is correspondingly arranged on each section easy to casing change, and the packers are sequentially set from bottom to top.
9. The shale gas well casing-deformation-prevention cementing method of claim 4, characterized in that during drilling, a drill bit with a predetermined diameter is used to form an open hole wellbore with a predetermined aperture, and the open hole wellbore passes through the casing-deformation-prone section and forms a predetermined annulus with the surrounding cementing device with a predetermined size.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395993A (en) * | 2020-02-11 | 2020-07-10 | 中国石油天然气集团有限公司 | Method for controlling fracturing deformation of horizontal casing of shale gas well |
| CN111706259A (en) * | 2020-07-14 | 2020-09-25 | 中国石油集团渤海钻探工程有限公司 | Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well |
| CN111852389A (en) * | 2020-07-16 | 2020-10-30 | 中国石油大学(北京) | Well cementing device for controlling shearing deformation of casing |
| CN112127800A (en) * | 2020-09-17 | 2020-12-25 | 西南石油大学 | Casing device for reducing casing shearing deformation and using method thereof |
| CN115573705A (en) * | 2022-10-11 | 2023-01-06 | 重庆科技学院 | Physical simulation method for deformation of horizontal section casing of deep shale gas well |
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