CN113622865B - Tail pipe pressure control well cementation method under packer setting condition - Google Patents
Tail pipe pressure control well cementation method under packer setting condition Download PDFInfo
- Publication number
- CN113622865B CN113622865B CN202110986622.6A CN202110986622A CN113622865B CN 113622865 B CN113622865 B CN 113622865B CN 202110986622 A CN202110986622 A CN 202110986622A CN 113622865 B CN113622865 B CN 113622865B
- Authority
- CN
- China
- Prior art keywords
- pressure
- packer
- tail pipe
- well
- cement slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention relates to a tail pipe pressure control cementing method under the packer setting condition. The method comprises the following steps: calculating the volume shrinkage of the cement paste in the waiting setting process according to the annular slurry column structure; designing the injection volume of the tail pipe pressure control cementing fluid under the setting condition of the packer; carrying out cement paste pressure control displacement operation without rubber plug collision pressure; lifting the packer after setting and sending the packer into a tool to carry out pressure control circulating well flushing; and (4) circularly pressurizing the feeding tool until the cement paste has enough gas channeling prevention capacity. The invention considers the influence of the setting of the packer of the tail pipe on the conventional tail pipe pressure control well cementation operation, and breaks through the pressure transmission path from the upper part of the packer to the inner part of the tail pipe string to the bottom of the well by changing the injection amount of cement slurry and the displacement operation mode in the tail pipe well cementation construction, thereby realizing the bottom of the well pressure control of the tail pipe well cementation operation under the setting condition of the packer.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a tail pipe pressure control cementing method under the packer setting condition.
Background
With the continuous development of oil and gas resources, the field of drilling operation shows the change trend from land to the sea, from shallow water to deep water and from shallow layer to deep layer, and the drilling operation depth is continuously increased. In the current common deep well body structure design at home and abroad, an end-opening secondary casing is usually designed as a hanging tail pipe, so that the tail pipe is hung on a front-opening casing in series and is matched with a cement ring to seal and separate an oil layer, a gas layer and a water layer of an open hole section. The quality of the liner cementing quality is closely related to the subsequent well completion operation and production safety of the oil and gas well.
Under the condition of a narrow safe density window, the conventional liner cementing operation is easy to leak stratum in a displacement stage, and the cement slurry is easy to cause channeling due to the weight loss in a waiting-to-set stage, so that the problems of difficult construction operation, poor cementing quality and the like are caused. In order to improve the replacement efficiency and the cementing quality of the small annular space gap of the tail pipe, a tail pipe pressure control cementing technology is often adopted on site. By applying annular compensation pressure on the wellhead, the technology can optimize the annular slurry column structure on the premise of ensuring no stratum leak, simultaneously increase the displacement and improve the displacement efficiency of liner cementing. During the waiting period of cement paste, the wellhead back pressure can be transmitted to the well bottom through the annular liquid, thereby compensating the well bottom pressure loss caused by the loss of cement paste weight, realizing the purpose of pressure stabilization and channeling prevention and improving the liner cementing quality.
However, for high risk wells with high temperature, high pressure, acid gas containing issues, etc., the design often considers setting a liner packer to prevent later wellbore integrity failures. In the liner cementing process, the setting of the packer occurs after the cement slurry is displaced in place and before the waiting period, so that the wellhead back pressure during the waiting period of the cement slurry cannot be smoothly transmitted to the bottom of the well along the annulus, and the pressure transmission cannot be realized by the rubber plug which is pressed against the inside of the pipe column, so that the bottom of the well pressure loss caused by the loss of weight of the cement slurry cannot be compensated, the formation fluid invades the annulus during the waiting period, the liner cementing quality is unqualified, and the integrity of the shaft and the subsequent development of the oil-gas well are seriously influenced.
Disclosure of Invention
In view of the above, the present invention is directed to a liner pressure-control cementing method under the setting condition of a packer, so as to achieve bottom hole pressure control during the waiting period of cement slurry in the setting condition of the liner packer.
The invention relates to a tail pipe pressure control cementing method under the packer setting condition, which comprises the following steps:
calculating the volume shrinkage of the cement paste in the waiting setting process according to the annular paste column structure;
designing the injection volume of liner pressure-control cementing fluid under the packer setting condition;
carrying out cement paste pressure control displacement operation without rubber plug collision pressure;
lifting the packer after setting and sending the packer into a tool to carry out pressure control circulating well flushing;
and circularly pressurizing the feeding tool until the cement paste has enough gas channeling prevention capacity.
According to an embodiment of the invention, the method further comprises designing the annular slurry column structure.
According to one embodiment of the invention, designing the annular slurry column structure comprises: by analyzing a safety operation density window, displacement and wellhead back pressure of an open hole section, under the condition that the pressure of a well bottom and a casing shoe in the well cementation construction process is ensured to be in accordance with the safety window, a front fluid for tail pipe well cementation, the density of cement slurry and annular back pressure parameters are designed.
According to one embodiment of the invention, calculating the volume shrinkage of the cement paste in the setting process comprises the following steps:
and calculating the volume shrinkage of the cement slurry in the displacement in place and in the cement slurry coagulation waiting process under the packer setting condition according to the filtration loss of the cement slurry column at the open hole section, the volume shrinkage of the hydration process, the thermal expansion of the cement slurry under the high-temperature condition in the well, and the volume change of the annulus of the tail pipe caused by the deformation of the open hole well wall and the tail pipe column.
According to one embodiment of the present invention, designing a liner pressure control cementing fluid injection volume under packer set conditions comprises:
calculating the injection volume of the pad fluid according to the pad fluid, the cement paste height return and the annular cross section area; calculating the actual injection volume of the cement paste according to the cement paste height return, the total well depth, the open hole annular cross section area and the volume shrinkage during the cement paste waiting setting process; calculating the length of the under-substituted section of the cement paste in the pipe string and the displacement position of the rubber plug according to the injection volume of the cement paste and the inner diameter of the tail pipe string; and calculating the injection volume of the displacement liquid or the drilling fluid according to the displacement position of the rubber plug and the inner diameter of the pipe column.
According to one embodiment of the invention, the cement paste pressure control replacement operation without rubber plug collision pressure comprises the following steps:
and carrying out cement paste replacement operation according to the corresponding discharge capacity, and enabling the bottom hole pressure to meet the requirement of a safe density window by adjusting the back pressure of the wellhead.
According to one embodiment of the invention, whether the cement slurry is replaced in place or not is determined by the injection volume of the displacement fluid, and when the injection volume of the displacement fluid reaches the design value, the replacement operation is finished.
According to one embodiment of the invention, lifting the packer after setting into a running tool for pressure-controlled circulating well flushing comprises:
after the tail pipe packer is set, bottom hole pressure is calculated according to the pressure transmission path from the upper shaft to the inside of the tail pipe string to the bottom hole, and bottom hole pressure fluctuation caused by the movable feeding tool and well flushing circulation is counteracted by controlling wellhead back pressure in the circulating well flushing process, so that leakage of an underground open hole section is avoided.
According to one embodiment of the present invention, cycling the running tool to a pressure buildup until the cement slurry has sufficient gas channeling resistance comprises:
the feeding tool is lifted to a certain depth and then is circulated, dynamic control of bottom hole pressure is realized by adjusting circulation discharge capacity and wellhead back pressure, bottom hole pressure loss caused by waiting coagulation loss of annular cement slurry is made up, and pressure is cyclically supplemented until the cement slurry has enough gas channeling prevention capacity.
According to one embodiment of the invention, the circulation refers to the process that the displacement fluid flows into the well along the inner space of the running tool and flows upwards along the annular space formed by the running tool and the casing and returns to the wellhead after reaching the current running depth of the running tool, so that the whole closed-loop flow is completed; the method for providing the cement slurry with sufficient gas channeling resistance further comprises the following steps: when the cement slurry injection replacement operation is finished, the replacement rubber plug does not reach the floating hoop, and a section of cement slurry still exists at the lower part of the tail pipe, so that the replacement rubber plug can still continuously descend under the action of pressure difference during waiting solidification, the effective transmission of pressure is ensured, the bottom hole pressure loss caused by waiting solidification weight loss of the cement slurry is compensated, and the annular gas channeling is avoided.
The invention considers the influence of the setting of the tail pipe packer on the conventional tail pipe pressure control well cementation operation, and realizes the well bottom pressure control of the tail pipe well cementation operation under the packer setting condition by changing the cement slurry injection amount and the displacement operation mode in the tail pipe well cementation construction and opening the pressure transmission path from the upper part of the packer to the inner part of the tail pipe string to the well bottom.
The invention can effectively reduce the bottom hole pressure change of the cementing operation with the packer tail pipe in the whole cement slurry displacement and waiting-to-set process, thereby reducing the risk of loss of an open hole section in the cement slurry displacement process and the risk of annular oil-gas water channeling in the cement slurry waiting-to-set period, and effectively improving the cement slurry displacement efficiency and the cementing quality of the cementing with the packer tail pipe.
The invention expands the application range of the pressure control well cementation technology, realizes the pressure control well cementation operation with the packer tail pipe, can meet the requirement of the stratum with a narrow safe density window on the fine control of the bottom hole pressure during the well cementation, can realize the setting of the high-risk well tail pipe packer to form a multi-stage barrier system, and effectively reduces the safety risk during the well drilling and completion and the later production.
Drawings
FIG. 1 is a schematic flow chart of a tail pipe control and well cementing method under a packer setting condition according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a wellbore mud column after a liner packer is set in accordance with an embodiment of the present invention;
FIG. 3 is a schematic illustration of the cyclic pressure buildup during the cement waiting period under a liner packer setting condition in accordance with an embodiment of the present invention;
reference numerals:
1. the device comprises a wellhead device, 2, a return pressure control valve, 3, a feeding tool, 4, a tail pipe packer, 5, a hanging slip, 6, a tail pipe, 7, a displacement rubber plug, 8, a floating hoop, 9, an open hole well wall, 10, displacement liquid, 11, cement paste, 12 and pad liquid.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
In order to overcome the defects in the prior art, the invention provides a liner pressure control cementing method under the packer setting condition. By using the tail pipe pressure control well cementation method under the packer setting condition, provided by the invention, the slurry column structure of tail pipe well cementation construction can be designed, the cement slurry injection amount is increased, and the displacement pump sending volume is reduced, so that the cement slurry displacement process is finished before the rubber plug is collided and pressed, and the pressure at the upper part of a shaft can be transmitted to the bottom of the shaft through the inside of the tail pipe column, thereby realizing the bottom of the shaft pressure control during the cement slurry waiting setting period under the packer setting condition of the tail pipe. The method provided by the invention can make up the bottom hole pressure loss caused by the cement slurry weightlessness under the setting condition of the tail pipe packer, thereby effectively preventing the well cementation problems of gas channeling and the like, improving the tail pipe well cementation quality and having important significance for the subsequent operation of oil-gas wells and the long-term effective development of oil fields.
In order to achieve the above object, the technical solution adopted by the embodiment of the present invention is as follows:
as shown in figure 1, a liner pressure control cementing method under the packer setting condition comprises the following specific steps:
1. designing an annular slurry column structure according to a conventional tail pipe pressure control well cementation method;
2. calculating the volume shrinkage of the cement paste in the waiting setting process;
3. designing the injection volume of the tail pipe pressure control cementing fluid under the setting condition of the packer;
4. carrying out cement paste pressure control displacement operation without rubber plug collision pressure;
5. lifting the packer after setting and sending the packer into a tool pressure control circulating well washing device;
6. and (4) circularly pressurizing the feeding tool until the cement paste has enough gas channeling prevention capacity.
The following is a detailed description.
As shown in fig. 2, the structure of the embodiment of the present invention is described as follows:
a wellhead assembly 1 which functions to provide suspension for different downhole sizes of casing; the back pressure control valve 2 can be a pressure control throttle valve, and the annular outlet pressure during circulation can be set by adjusting the opening of the throttle valve; the running tool 3 is connected with the tail pipe 6 and assists in lowering the tail pipe string; a tail pipe packer 4 as one of the components of the tail pipe hanger, capable of blocking the pressure transmission path of the upper and lower annular spaces of the packer after setting; the hanging slips 5 are used as one of the components of the liner hanger, can hang the upper-layer sleeve in an opening state and provide enough hanging force for the lower liner string; the displacement rubber plug 7 is used for separating cement paste from displacement liquid; the floating hoop 8 has the function of a check valve and the function of limiting the rubber plug, and once the rubber plug reaches the position of the floating hoop, the rubber plug cannot continuously descend, so that the pressure transmission path in the tail pipe fails; the open hole well wall 9 is the wall of the open hole section; a displacement fluid 10, typically a drilling fluid; a cement paste 11 which can form a cement sheath on the outside of the liner string after setting; and the pad fluid 12 is used for improving the replacement efficiency of cement slurry. When the cement slurry injection replacement operation is finished, the replacement rubber plug 7 does not reach the floating hoop 8, and at the moment, a section of cement slurry 11 still exists at the lower part of the tail pipe 6, so that the replacement rubber plug 7 can still continue to descend under the action of pressure difference during waiting for setting, the effective transmission of pressure is ensured, the bottom hole pressure loss caused by waiting for setting loss of the cement slurry 11 is compensated, the annular air channeling is avoided, and finally the well cementation quality of the tail pipe with the packer is effectively improved.
And designing an annular slurry column structure according to a conventional liner pressure control cementing method. By analyzing a safety operation density window, displacement and wellhead back pressure of an open hole section, under the condition that the pressure of a well bottom and a casing shoe in the well cementation construction process is ensured to be in accordance with the safety window, the density and annular space height return parameters of a front fluid (cleaning fluid and spacer fluid), cement slurry (collar slurry and tail slurry) used for tail pipe well cementation are designed.
And (4) calculating the volume shrinkage of the cement paste in the waiting setting process. According to the performance of the cement slurry and the underground environment condition, the volume change of the tail pipe annulus caused by the filtration loss of the slurry column in the open hole section, the volume shrinkage in the hydration process, the thermal expansion of the cement slurry under the high-temperature condition in the well and the deformation of the open hole well wall and the tail pipe column are respectively analyzed, and on the basis, the volume shrinkage of the cement slurry in the cement slurry coagulation waiting process under the packer setting condition is comprehensively calculated.
And designing the injection volume of the liner pressure-control cementing fluid under the setting condition of the packer. Calculating the injection volume of the pad fluid according to the pad fluid, the cement paste height return and the annular cross section area; calculating the actual injection volume of the cement paste according to the cement paste height return, the total well depth, the open hole annular cross section area and the volume shrinkage during the cement paste waiting setting process; calculating the length of the under-substituted section of the cement paste in the pipe string and the displacement position of the rubber plug according to the injection volume of the cement paste and the inner diameter of the tail pipe string; and calculating the injection volume of the displacement liquid or the drilling fluid according to the displacement position of the rubber plug and the inner diameter of the tubular column.
And carrying out cement paste pressure control displacement operation without rubber plug collision pressure. On the basis of the fluid injection volume designed in the previous step, cement slurry displacement operation is carried out according to the corresponding discharge capacity, and the well bottom pressure meets the requirement of a safe density window by adjusting the well mouth back pressure in the displacement process; and (4) judging whether the cement slurry is replaced in place or not by taking the injection volume of the displacement liquid as a reference, and finishing the replacement operation when the injection volume of the displacement liquid reaches a design value.
After setting, the packer is lifted upwards and sent into a tool to control pressure and circularly wash the well. After the tail pipe packer is set, bottom hole pressure is calculated according to the pressure transmission path from the upper shaft to the inside of the tail pipe string to the bottom hole, and bottom hole pressure fluctuation caused by the movable feeding tool and well flushing circulation is counteracted by controlling wellhead back pressure in the circulating well flushing process, so that leakage of an underground open hole section is avoided.
And (4) circularly pressurizing the feeding tool until the cement paste has enough gas channeling prevention capacity. The running tool is raised to a certain depth and then the circulation is opened, at which time the displacement fluid flows along the running tool interior to the current running depth of the tool and then into the annulus and up to the wellhead, the entire circulation path being shown in figure 3. Dynamic control of bottom hole pressure is realized by adjusting circulation discharge capacity and wellhead back pressure, bottom hole pressure loss caused by waiting coagulation loss of annular cement slurry is compensated, and pressure is supplemented circularly until the cement slurry has enough gas channeling prevention capacity.
The following is a more detailed description of the embodiments.
According to one embodiment of the invention, the tail pipe pressure control cementing method under the packer setting condition comprises the following steps:
1. annular slurry column structure designed according to conventional liner pressure control cementing method
By analyzing a safety operation density window, displacement and wellhead back pressure of an open hole section, under the condition that the pressure of a well bottom and a casing shoe in the well cementation construction process is ensured to be in accordance with the safety window, the density and annular space height return parameters of a front fluid (cleaning fluid and spacer fluid), cement slurry (collar slurry and tail slurry) used for tail pipe well cementation are designed. The annular space return height of the front liquid is h u The annular space height of the cement paste is h c 。
2. Calculating the volume shrinkage of cement paste in the waiting setting process
According to the performance of the cement slurry and the underground environment condition, the volume change of the tail pipe annulus caused by the filtration and water loss of the slurry column in the open hole section, the volume shrinkage of the hydration process, the thermal expansion of the cement slurry under the high-temperature condition in the well and the deformation of the open hole well wall and the tail pipe column are respectively analyzed, and the volume shrinkage of the cement slurry in the cement slurry waiting and setting process under the packer setting condition is comprehensively calculated on the basis.
1) Volume change of fluid loss of slurry column in open hole section
The filtration loss volume change delta V of the slurry column in the open hole section can be calculated by the formula (1) loss ：
ΔV loss ＝vt(h-h a )απd w (1)
In the formula,. DELTA.V loss The filtration loss volume change quantity m of the slurry column at the open hole section 3 (ii) a v is the filtration rate of unit area on the borehole wall of the open hole section in unit time, m.min -1 The value can refer to the API filtration loss of cement slurry; t is the duration of the fluid loss process, min; h is the total well depth, m; h is a The depth of the upper layer casing shoe at the naked eye section is m; alpha is the borehole expansion rate of the open hole section and is dimensionless; d w Drill bit for open hole section drillingDiameter, m.
2) Volume shrinkage of cement slurry in hydration process
In the formula,. DELTA.V sh M is the volume shrinkage of cement paste in the hydration process 3 (ii) a k is the volume shrinkage coefficient of the hydration process before the initial setting of the cement paste, and is dimensionless, and the value can be measured by experiments; d lo The tail pipe outer diameter, m.
3) Volume change of thermal expansion of cement slurry under high temperature conditions
In the formula,. DELTA.V T Is the thermal expansion volume change quantity of cement paste, m 3 (ii) a Gamma is the coefficient of thermal expansion of cement slurry and DEG C -1 (ii) a T is the temperature of cement paste under the well at DEG C; t is 0 The temperature before the cement slurry is injected is DEG C.
4) And tail pipe annular volume variable quantity caused by deformation of open hole well wall and tail pipe column
The annular volume change delta V caused by the open hole well wall and tail pipe column deformation can be calculated by the formula (4) a ：
In the formula,. DELTA.V a Is the tail pipe annular volume variable quantity m 3 (ii) a Delta S is the variation of the annular sectional area at a certain depth of the open hole section, m 2 。
5) Volume shrinkage in the cement paste setting process
By combining the formulas (1) to (4), the volume shrinkage delta V in the cement paste setting process can be calculated by the formula (5):
ΔV＝ΔV loss +ΔV sh -ΔV T +ΔV a (5)
wherein, delta V is the cement paste waiting solidification processVolume shrinkage of (1), m 3 。
3. Designing tail pipe pressure control cementing fluid injection volume under packer setting condition
1) Design the priming volume
Based on the height return of the pad fluid and cement paste and the annular sectional area, the injection volume V of the pad fluid is calculated by a formula (6) u ：
In the formula, V u For priming volume, m 3 ；d a The inner diameter of an upper layer sleeve of an open hole section is m; d po The tail pipe string is run into the tool outside diameter, m.
2) Designing the cement slurry injection volume
Based on the cement paste height return, the total well depth, the open hole annular cross section area and the volume shrinkage in the cement paste waiting setting process,
in the formula, V c For the actual injection volume of the cement paste, m 3 。
3) Design the rubber plug displacement position
Based on the injection volume of the cement slurry and the inner diameter of the tail pipe string, calculating the length L of the under-substituted section of the cement slurry in the tail pipe by a formula (8):
in the formula, L is the length of the cement paste under-substituted section m; d li Is the tail pipe internal diameter, m.
Calculating the rubber plug displacement position h by the formula (9) plu ：
h plu ＝h-L (9)
In the formula, h plu M is the actual displacement depth of the rubber plug.
4) Design of injection volume of displacement or drilling fluid
Based on the displacement position of the rubber plug and the inner diameter of the tubular column, the injection volume V of the displacement liquid or the drilling liquid is calculated by the formula (10) d ：
In the formula, V d In order to displace the injection volume of the fluid or drilling fluid, m 3 ；h l The top depth of the tail pipe string is m; d pi The liner string is run into the tool inside diameter, m.
4. Cement paste pressure control displacement operation without rubber plug collision pressure
And carrying out cement paste pressure control displacement operation without rubber plug collision pressure. On the basis of the fluid injection volume designed in the previous step, cement slurry displacement operation is carried out according to the corresponding discharge capacity, and the well bottom pressure meets the requirement of a safe density window by adjusting the well mouth back pressure in the displacement process; and (3) judging whether the cement slurry is replaced in place or not by taking the injection volume of the displacement liquid as a reference, and finishing the replacement operation and setting the tail pipe packer when the injection volume of the displacement liquid reaches a design value. A schematic diagram of the structure of the wellbore slurry column after the tail pipe packer is set is shown in FIG. 2.
5. Pressure-controlled circulating well flushing device for lifting and feeding packer after setting
After the tail pipe packer is set, bottom hole pressure is calculated according to the pressure transmission path from the upper shaft to the inside of the tail pipe string to the bottom hole, and bottom hole pressure fluctuation caused by the movable feeding tool and well flushing circulation is counteracted by controlling wellhead back pressure in the circulating well flushing process, so that leakage of an underground open hole section is avoided. Bottom hole pressure P of the process w And formation fracture pressure P f Should satisfy P w ＜P f Bottom hole pressure P w Can be calculated by the formula (11):
P w ＝ρ m gh plu +ρ c gL+P trip -P flow +P a (11)
in the formula, P w Bottom hole pressure, MPa; rho m For circulating drilling fluid density, kg.m -3 ；ρ c Is the cement paste density, kg·m -3 (ii) a g is gravity acceleration, 9.8 m.s -2 ；P trip The exciting pressure is generated when the pipe column is moved, and is MPa; p flow The circulating pressure loss is MPa generated during well washing circulation; p a The well head back pressure is MPa.
6. The cement slurry is sent into a tool for cyclic pressure compensation until the cement slurry has enough gas channeling prevention capacity
The schematic view of the circulating pressure supplement of the running tool in the cement paste waiting setting process is shown in figure 3. Raising the running tool to a depth h d A back-on cycle by adjusting the cycle displacement Q p And wellhead back pressure P a The dynamic control of the bottom hole pressure is realized, the bottom hole pressure loss caused by the waiting coagulation weight loss of the annular cement slurry is compensated, and the pressure is circularly compensated until the cement slurry has enough gas channeling prevention capability. Calculating the circulating friction resistance P generated by the circulating drilling fluid of the running tool according to the formula (12) flow ：
In the formula, h d M is the depth of the bottom of the feeding tool during circulation; f is the circulating friction coefficient of the drilling fluid and has no dimension; v. of a The upward return speed of the annular drilling fluid, m.s -1 ；D a Is the equivalent diameter of the annular cross section, m.
Taking Bingham fluid as an example, a solving method of the drilling fluid circulation friction coefficient f in the formula (12) is given:
the gauge diameter, m; v is the average flow velocity in cross section, m.s -1 (ii) a Eta is the viscosity coefficient of Bingham fluid, pa.s; tau. 0 Is the ultimate dynamic shear force of Bingham fluid, pa.
Calculating the circulation displacement and wellhead back pressure at the time t in the cement paste waiting setting process by the formula (15), and making up for the bottom hole pressure loss delta P caused by cement paste weight loss:
ΔP＝P flow (Q p )+P a -P flow (Q p0 )-P a0 (14)
in the formula, delta P is bottom hole pressure loss caused by cement slurry weight loss, MPa; q p The discharge capacity m is added for circulation at a certain moment in the waiting coagulation process 3 ·s；Q p0 For the cyclic pressure-compensating displacement at the initial moment, m 3 ·s；P a0 The wellhead back pressure at the initial moment is MPa.
Compared with the prior art, the invention has the following beneficial effects:
1. the method of the invention considers the influence of the setting of the tail pipe packer on the conventional tail pipe pressure control well cementation operation, and realizes the bottom hole pressure control of the tail pipe well cementation operation under the packer setting condition by changing the injection amount of cement slurry and the displacement operation mode in the tail pipe well cementation construction and opening the pressure transmission path from the upper part of the packer to the inside of the tail pipe string to the bottom hole.
2. The method can effectively reduce the bottom hole pressure change of the tail pipe cementing operation with the packer in the whole cement slurry displacement and waiting-to-set process, thereby reducing the risk of leakage at an open hole section in the cement slurry displacement process and the risk of annular oil gas water channeling in the cement slurry waiting-to-set period, and effectively improving the cement slurry displacement efficiency and the cementing quality of the tail pipe cementing with the packer.
3. The method expands the application range of the pressure-controlled well cementation technology, realizes the pressure-controlled well cementation operation with the packer tail pipe, can meet the requirement of a stratum with a narrow safety density window on fine control of the bottom pressure during well cementation, can realize setting of a high-risk wellbore liner packer to form a multi-stage barrier system, and effectively reduces safety risks during well drilling and completion and later-period production.
It should be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In addition, in the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The foregoing embodiments are merely illustrative of the present invention, and various components and devices of the embodiments may be changed or eliminated as desired, not all components shown in the drawings are necessarily required, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments described herein, and all equivalent changes and modifications based on the technical solutions of the present invention should not be excluded from the scope of the present invention.
Claims (8)
1. A liner pressure control cementing method under the packer setting condition is characterized by comprising the following steps:
calculating the volume shrinkage of the cement paste in the waiting setting process according to the annular slurry column structure;
designing the injection volume of the tail pipe pressure control cementing fluid under the setting condition of the packer;
carrying out cement paste pressure control displacement operation without rubber plug collision pressure;
lifting the packer after setting and sending the packer into a tool to carry out pressure control circulating well flushing;
circularly pressurizing the feeding tool until the cement paste has enough gas channeling prevention capacity;
the cement paste pressure control displacement operation without rubber plug collision comprises the following steps:
performing cement slurry replacement operation according to the corresponding discharge capacity, and enabling the bottom hole pressure to meet the requirement of a safe density window by adjusting the back pressure of a well mouth;
designing the injection volume of the liner pressure-control cementing fluid under the setting condition of the packer comprises the following steps:
calculating the injection volume of the pad fluid according to the pad fluid, the cement paste height and the annular sectional area; calculating the actual injection volume of the cement paste according to the cement paste height, the total well depth, the open hole annular sectional area and the volume shrinkage in the cement paste waiting setting process; calculating the length of the under-substituted section of the cement paste in the pipe string and the displacement position of the rubber plug according to the injection volume of the cement paste and the inner diameter of the tail pipe string; and calculating the injection volume of the displacement liquid or the drilling fluid according to the displacement position of the rubber plug and the inner diameter of the tubular column.
2. The method of liner controlled pressure cementing under packer set conditions of claim 1, further comprising designing the annular slurry column structure.
3. The liner pressure control cementing method under the packer setting condition according to claim 2, wherein designing the annular slurry column structure comprises: by analyzing a safety operation density window, displacement and wellhead back pressure of an open hole section, under the condition that the pressure of a well bottom and a casing shoe in the well cementation construction process is ensured to be in accordance with the safety window, a front fluid for tail pipe well cementation, the density of cement slurry and annular back pressure parameters are designed.
4. A liner pressure-controlling cementing method under the packer setting condition according to any one of claims 1 to 3, wherein the calculating of the volume shrinkage during the cement paste setting process comprises:
and calculating the volume shrinkage of the cement slurry in the displacement in place and in the cement slurry coagulation waiting process under the packer setting condition according to the filtration loss of the cement slurry column at the open hole section, the volume shrinkage of the hydration process, the thermal expansion of the cement slurry under the high-temperature condition in the well, and the volume change of the annulus of the tail pipe caused by the deformation of the open hole well wall and the tail pipe column.
5. The liner pressure-control well cementation method under the setting condition of the packer as claimed in claim 1, wherein whether the cement slurry is replaced in place is based on the injection volume of the displacement fluid, and when the injection volume of the displacement fluid reaches the design value, the replacement operation is finished.
6. A liner pressure-control cementing method under the packer setting condition according to any one of claims 1 to 3, wherein the lifting of the setting tool for pressure-control circulating well flushing after the packer is set comprises:
after the tail pipe packer is set, bottom hole pressure is calculated according to the pressure transmission path from the upper shaft to the inside of the tail pipe string to the bottom hole, and bottom hole pressure fluctuation caused by the movable feeding tool and well flushing circulation is counteracted by controlling wellhead back pressure in the circulating well flushing process, so that leakage of an underground open hole section is avoided.
7. A liner pressure-controlled cementing method according to any one of the claims 1 to 3, wherein the circulating pressure-compensating of the running tool until the cement slurry has sufficient gas channeling prevention capability comprises:
the feeding tool is lifted to a certain depth and then is circulated, dynamic control of bottom hole pressure is realized by adjusting circulation discharge capacity and wellhead back pressure, bottom hole pressure loss caused by waiting coagulation loss of annular cement slurry is made up, and pressure is cyclically supplemented until the cement slurry has enough gas channeling prevention capacity.
8. The liner pressure-controlled cementing method under the packer setting condition as claimed in claim 7, wherein the circulation refers to the process that the displacement fluid flows into the well along the inner space of the running tool and flows back to the well head along the annular space formed by the running tool and the casing after reaching the current running depth of the running tool, and the whole closed-circuit flow is completed; the method for providing the cement slurry with sufficient gas channeling resistance further comprises the following steps: when the cement slurry injection replacement operation is finished, the replacement rubber plug does not reach the floating hoop, and a section of cement slurry still exists at the lower part of the tail pipe, so that the replacement rubber plug can still continuously descend under the action of pressure difference during waiting solidification, the effective transmission of pressure is ensured, the bottom hole pressure loss caused by waiting solidification weight loss of the cement slurry is compensated, and the annular gas channeling is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986622.6A CN113622865B (en) | 2021-08-26 | 2021-08-26 | Tail pipe pressure control well cementation method under packer setting condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110986622.6A CN113622865B (en) | 2021-08-26 | 2021-08-26 | Tail pipe pressure control well cementation method under packer setting condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113622865A CN113622865A (en) | 2021-11-09 |
| CN113622865B true CN113622865B (en) | 2023-03-17 |
Family
ID=78387801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110986622.6A Active CN113622865B (en) | 2021-08-26 | 2021-08-26 | Tail pipe pressure control well cementation method under packer setting condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113622865B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114482916B (en) * | 2021-12-27 | 2024-02-13 | 中海石油(中国)有限公司 | Tail pipe controlled pressure weather coagulation construction parameter analysis method, device and medium with packer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967964B (en) * | 2010-09-03 | 2013-07-10 | 大庆石油管理局 | Method for prewashing multi-density double-setting long-sealing gas channeling prevention well cementing |
| CN202140062U (en) * | 2011-06-30 | 2012-02-08 | 中国石油集团川庆钻探工程有限公司 | Hydraulic drilling-free tail pipe hanging packer |
| CA2795818C (en) * | 2011-11-16 | 2015-03-17 | Weatherford/Lamb, Inc. | Managed pressure cementing |
| CN105298440B (en) * | 2015-10-27 | 2018-08-14 | 中国石油天然气股份有限公司 | A kind of design method of well cementation annular space slurry rod structure |
| CN109723403A (en) * | 2017-10-30 | 2019-05-07 | 中国石油天然气股份有限公司 | A kind of tail pipe pressure control well shaft fixing technology |
| CN108915635B (en) * | 2018-07-23 | 2021-07-06 | 中国石油集团川庆钻探工程有限公司 | Method for preventing gas channeling after cementing of high-pressure gas well tail pipe |
| CN110630213B (en) * | 2019-09-26 | 2021-07-20 | 中石化石油工程技术服务有限公司 | Ultra-deep narrow-gap liner cementing method with stratum invader |
| CN111411917A (en) * | 2020-05-29 | 2020-07-14 | 中国石油天然气集团有限公司 | Liner cementing tool with packer and cementing method |
-
2021
- 2021-08-26 CN CN202110986622.6A patent/CN113622865B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113622865A (en) | 2021-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3028914A (en) | Producing multiple fractures in a cased well | |
| CN108915635B (en) | Method for preventing gas channeling after cementing of high-pressure gas well tail pipe | |
| CN108240196B (en) | Liner cementing method for controlling annular equivalent density of pressure sensitive stratum | |
| US20200232299A1 (en) | Cement squeeze well tool | |
| CN110284847B (en) | Drilling fluid circulation system for reducing drilling tripping suction pressure | |
| CN113622865B (en) | Tail pipe pressure control well cementation method under packer setting condition | |
| CN104047556B (en) | A kind of method preventing long 7 oil shales from caving in | |
| CN106703743A (en) | Gel isolation well control method | |
| US20200240254A1 (en) | Gas separator | |
| CN110593856A (en) | Method for measuring density window of well cementation safety operation | |
| CN115822530A (en) | Long horizontal section under-pressure drill rod transmission well-flushing and perforation integrated tool and method | |
| CN113309460B (en) | Oil-gas well fracturing filling well reconstruction drilling method and device | |
| CN207686693U (en) | A kind of flow string and device for producing thickened oil | |
| CA3035831C (en) | Method and system for distribution of a proppant | |
| CN111535747B (en) | Method for preventing leakage of casing under drilling narrow window | |
| CN114934762A (en) | Heavy oil reservoir oil production method and oil production system thereof | |
| CN110630213B (en) | Ultra-deep narrow-gap liner cementing method with stratum invader | |
| US2372461A (en) | Apparatus for placing gravel in wells | |
| RU2640844C1 (en) | Method for running casing string in horizontal long-distance wellbore | |
| RU2778361C1 (en) | Method for cementing the casing string of a borehole | |
| US3481402A (en) | Cement placement tool and method | |
| CN112983290B (en) | Oil well production pipe column, use method of oil well production pipe column and oil well production system | |
| SU1745889A1 (en) | Method for isolation of lost-circulation formations | |
| RU2649204C1 (en) | Method for drilling-in at controlled drawdown | |
| CN117627543A (en) | Well structure design method and device considering geological necessary sealing points |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |