CN105569626A - Oil well fracturing sand control method - Google Patents
Oil well fracturing sand control method Download PDFInfo
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- CN105569626A CN105569626A CN201410535095.7A CN201410535095A CN105569626A CN 105569626 A CN105569626 A CN 105569626A CN 201410535095 A CN201410535095 A CN 201410535095A CN 105569626 A CN105569626 A CN 105569626A
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Abstract
The invention discloses an oil well fracturing sand control method, and belongs to the oil field extraction field; the method comprises the following steps: filling sand in an artificial bottom hole; filling soft fiber aqueous solution and resin coating sand aqueous solution after sand filling operation; detecting the depth from the resin coating sand surface to the well head; lowering a plug string to do drilling plug work on a resin coating sand plug surface; inserting a sand washing tube after the drilling plug is done so as to washing sands and complete the well. The method uses high pressure to fill the soft fiber and resin coating so as to block the sand in an oil reservoir outside the oil well, thus preventing the stratum sand to enter a pump barrel and causing pump block and low oil well oil extraction efficiency, and improving oil extraction efficiency.
Description
Technical field
The present invention relates to oil extraction in oil field technical field, particularly a kind of method of wellfracturing sand control.
Background technology
Along with the exploitation in oil field is goed deep into, because oil well is produced and the supplementary deficiency of stratum energy for a long time, cause some sand productions serious, the sandstone particle of loose cementation enters pit shaft with profit or is carried into ground, meeting erosion, wearing and tearing, blocking deep well pump and pipeline and ground installation, or being deposited on shaft bottom, blocking oil reservoir, makes oil well reduce or stop production.Effective sand control measure should be taked in time in process of production, to avoid the loss caused of shaking out.
Current sand control measure is mainly screen casing filter screen sand control method, which is fixed on steel pipe with holes by many slit screen pipes, down to sand producing interval and with load fluid by the sand grains cyclic pac king of certain particle diameter outside screen casing, the outer sand grains of tube forms bridge arch, with filtration resistance sand production in oil.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
Said method requires to analyze according to the sand sample granularity of shaking out in oil well, select screen casing to stitch and widely just can carry out sand control operation with the diameter inserting sand grains, the efficiency of this sand control method is lower, needs to carry out separately calculating for each sand well just can carry out.
Summary of the invention
In order to solve the problem of prior art, embodiments provide a kind of method of wellfracturing sand control.Described technical scheme is as follows:
On the one hand, provide a kind of method of wellfracturing sand control, described method comprises:
Enter the back-up sand tubing string with sand-washing pen point under in down-hole casing, described back-up sand tubing string comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point; From described have inside the Pass inject back-up sand liquid, until the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope; The quartz sand of described back-up sand liquid to be particle diameter be 0.4 to 0.8mm and concentration are the mixture of the potassium chloride KCI aqueous solution of 2%, and the percentage by weight of described quartz sand and the KCI aqueous solution is between 5 to 6%; Control pump truck output at 400 to 500L/min;
In described back-up sand tubing string, inject flushing fluid carry out direct flushing, described flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 12 hours, treats that the sand sedimentation time arrives by the degree of depth of described back-up sand tubing string detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope;
On carry described back-up sand tubing string, with the position making described sand-washing pen point be positioned at 4.5 to 5.5m on the circle of oil reservoir top.Described oil pipe is diameter is 73mm external upset tubing; And carry out the operation of mounting shaft mouth;
By described back-up sand tubing string to oil well direct circulation prepad fluid, described prepad fluid is the KCI aqueous solution of 2%; In described oil well, the soft fibre aqueous solution 15 to the 25m of 10% is injected when pump pressure is stablized and discharge capacity is stablized
3; After treating that the injection of the described soft fibre aqueous solution is complete, in described oil well, inject de-oiling formation water, treat that pump pressure is stable and discharge capacity is stabilized in 1.2 to 1.6m
3starting during/min in described oil well, inject particle diameter is 0.4 to 0.8mmH
3resin coated sand; Wherein, described de-oiling formation water and described resin coated sand percentage by weight control between preset ratio; When described pressure break pump truck pressure is risen 3 to 5MPa by stable pump pressure when initially adding sand, stop adding resin coated sand in described load fluid, pump truck continues circulation displacement fluid 5 ~ 15m
3, described displacement fluid is de-oiling formation water;
Described back-up sand tubing string is transferred, to detect the degree of depth of resin coated sand plug identity distance from well head in described down-hole casing;
Enter the brill plug tubing string with tricone bit under in described down-hole casing, described brill plug tubing string is oil pipe, screw drill and tricone bit from well head from top to bottom, described oil pipe, is threaded connection between described screw drill and described tricone bit; From well head by entering to bore the position of plug tubing string to described resin coated sand plug identity distance second predeterminable range scope in the degree of depth of well head under the first pre-set velocity; Flushing fluid is injected, discharge capacity 500 to the 600L/min of described flushing fluid in described oil pipe; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid, carry out the operation of brill plug by the second pre-set velocity to enter described brill plug tubing string under default pressurization tonnage; Until stop pressurization when boring 1m under plug to sand face; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid; Trip out described brill plug tubing string; Wherein, when described brill plug tubing string often enters 3 to 5m down, movable described brill plug tubing string is above carried once;
Enter the sand-flushing pipe column with sand-washing pen point under in described down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the distance of sand face to the artificial bottom of a well in described oil well well in the position of the 3rd predeterminable range scope; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours;
Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 4th predeterminable range scope;
Carry out well completion operations by the flow string that enters to recover the oil under geological scheme requirement, described oil recovery flow string comprises from top to bottom from well head: the oil pipe that is threaded, oil well pump and back taper; Mast in described oil recovery flow string is combined as: sucker rod connects oil pump plunger piston.
Optionally, described first pre-set velocity is 8 to 10m/min; Described second pre-set velocity is 0.5 to 1m/min.
Optionally, described first predeterminable range scope is 8 to 12m; Described second predeterminable range scope is 4 to 6m; Described 3rd predeterminable range scope is 5 to 10m; Described 4th predeterminable range scope is 5 to 10m;
Optionally, described preset ratio is 5 to 15%.
Optionally, described in down-hole casing under enter with sand-washing pen point back-up sand tubing string before, described method also comprises:
Trip out the flow string that well recovery is produced, described flow string comprises oil pipe, sucker rod and oil well pump;
Enter the sand-flushing pipe column with sand-washing pen point under in down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the position of distance between the 5th predeterminable range scope of sand face to the artificial bottom of a well in described oil well well; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours; Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 6th predeterminable range scope;
The drifting tubing string entered under in well with drift size gauge tool carries out drifting operation, under the speed of well head by the 3rd pre-set velocity, enter drifting tubing string to artificial bottom of a well; Carry out anti-flushing well to oil well afterwards, pump into clear water cook flushing fluid from oil jacket annular space, described flushing fluid returns out from oil pipe, and the displacement control of described flushing fluid is at 15 ~ 20m
3/ h, treats that returning out clear water from oil pipe stops well-flushing, and trips out drifting tubing string;
Described drifting tubing string comprises oil pipe, oil pipe variable buckle joint and drift size gauge tool; Described drifting tubing string comprises oil pipe from top to bottom from well head, oil pipe lower end connected pipes variable buckle joint, and described oil pipe variable buckle joint lower end connects drift size gauge tool; Described oil pipe, to be threaded connection between described oil pipe variable buckle joint and described drift size gauge tool.
Optionally, described 3rd pre-set velocity is 8 ~ 10m/min.
Optionally, described 5th predeterminable range scope is 5 to 10m; Described 6th predeterminable range scope is 5 to 10m.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
By carrying out back-up sand operation to artificial bottom of a well; And after back-up sand operation, insert the soft fibre aqueous solution and the resin coated sand aqueous solution; Visit the degree of depth of resin coated sand sand identity distance from well head; Lower brill plug tubing string carries out brill plug resin coated sand plug face; Enter sand-flushing pipe column under after brill plug and carry out sand washing and completion.Utilize high pressure packing soft fibre and resin-coating by the sand gear that goes out in oil reservoir outside oil well, avoid reservoir sand and enter pump barrel and cause holddown, and then cause the problem of well recovery inefficiency, improve the efficiency of oil recovery.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the method flow diagram of the wellfracturing sand control that the embodiment of the present invention one provides.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments provide a kind of method of wellfracturing sand control, see Fig. 1, method flow comprises:
First perform the step preparing construction in the embodiment of the present invention, comprising:
Trip out flow string in well: trip out the flow string that well recovery is produced, described flow string comprises oil pipe, sucker rod and oil well pump;
Under enter sand-flushing pipe column: enter the sand-flushing pipe column with sand-washing pen point under in down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the position of distance between the 5th predeterminable range scope of sand face to the artificial bottom of a well in described oil well well; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
Visit sand face: in described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours; Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 6th predeterminable range scope;
Drifting: the drifting tubing string entered under in well with drift size gauge tool carries out drifting operation, enters drifting tubing string to artificial bottom of a well under the speed of well head by the 3rd pre-set velocity; Carry out anti-flushing well to oil well afterwards, pump into clear water cook flushing fluid from oil jacket annular space, described flushing fluid returns out from oil pipe, and the displacement control of described flushing fluid is at 15 ~ 20m
3/ h, treats that returning out clear water from oil pipe stops well-flushing, and trips out drifting tubing string;
Described drifting tubing string comprises oil pipe, oil pipe variable buckle joint and drift size gauge tool; Described drifting tubing string comprises oil pipe from top to bottom from well head, oil pipe lower end connected pipes variable buckle joint, and described oil pipe variable buckle joint lower end connects drift size gauge tool; Described oil pipe, to be threaded connection between described oil pipe variable buckle joint and described drift size gauge tool.
Wherein, described 3rd pre-set velocity is 8 ~ 10m/min;
Wherein, described 5th predeterminable range scope is 5 to 10m; Described 6th predeterminable range scope is 5 to 10m.
After execution preparation of construction work, perform the step of sand control operation, comprising:
Under enter back-up sand tubing string: enter the back-up sand tubing string with sand-washing pen point under in down-hole casing, described back-up sand tubing string comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point; From described have inside the Pass inject back-up sand liquid, until the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope; The quartz sand of described back-up sand liquid to be particle diameter be 0.4 to 0.8mm and concentration are the mixture of the potassium chloride KCI aqueous solution of 2%, and the percentage by weight of described quartz sand and the KCI aqueous solution is between 5 to 6%; Control pump truck output at 400 to 500L/min;
Visit sand face: in described back-up sand tubing string, inject flushing fluid carry out direct flushing, described flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 12 hours, treats that the sand sedimentation time arrives by the degree of depth of described back-up sand tubing string detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope;
Well head is installed: above carry described back-up sand tubing string, with the position making described sand-washing pen point be positioned at 4.5 to 5.5m on the circle of oil reservoir top.Described oil pipe is diameter is 73mm external upset tubing; And carry out the operation of mounting shaft mouth;
Back-up sand: by described back-up sand tubing string to oil well direct circulation prepad fluid, described prepad fluid is the KCI aqueous solution of 2%; In described oil well, the soft fibre aqueous solution 15 to the 25m of 10% is injected when pump pressure is stablized and discharge capacity is stablized
3; After treating that the injection of the described soft fibre aqueous solution is complete, in described oil well, inject de-oiling formation water, treat that pump pressure is stable and discharge capacity is stabilized in 1.2 to 1.6m
3starting during/min in described oil well, inject particle diameter is 0.4 to 0.8mmH
3resin coated sand; Wherein, described de-oiling formation water and described resin coated sand percentage by weight control between preset ratio; When described pressure break pump truck pressure is risen 3 to 5MPa by stable pump pressure when initially adding sand, stop adding resin coated sand in described load fluid, pump truck continues circulation displacement fluid 5 ~ 15m
3, described displacement fluid is de-oiling formation water;
Visit plug face: in described down-hole casing, transfer described back-up sand tubing string, to detect the degree of depth of resin coated sand plug identity distance from well head;
Under enter bore plug tubing string: enter the brill plug tubing string with tricone bit under in described down-hole casing, described brill plug tubing string is oil pipe, screw drill and tricone bit from well head from top to bottom, described oil pipe, is threaded connection between described screw drill and described tricone bit; From well head by entering to bore the position of plug tubing string to described resin coated sand plug identity distance second predeterminable range scope in the degree of depth of well head under the first pre-set velocity; Flushing fluid is injected, discharge capacity 500 to the 600L/min of described flushing fluid in described oil pipe; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid, carry out the operation of brill plug by the second pre-set velocity to enter described brill plug tubing string under default pressurization tonnage; Until stop pressurization when boring 1m under plug to sand face; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid; Trip out described brill plug tubing string; Wherein, when described brill plug tubing string often enters 3 to 5m down, movable described brill plug tubing string is above carried once;
Under enter sand-flushing pipe column: enter the sand-flushing pipe column with sand-washing pen point under in described down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the distance of sand face to the artificial bottom of a well in described oil well well in the position of the 3rd predeterminable range scope; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
Visit sand face: in described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours;
Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 4th predeterminable range scope;
Completion: carry out well completion operations by the flow string that enters to recover the oil under geological scheme requirement, described oil recovery flow string comprises from top to bottom from well head: the oil pipe that is threaded, oil well pump and back taper; Mast in described oil recovery flow string is combined as: sucker rod connects oil pump plunger piston.
Wherein, described first pre-set velocity is 8 to 10m/min; Described second pre-set velocity is 0.5 to 1m/min.
Wherein, described first predeterminable range scope is 8 to 12m; Described second predeterminable range scope is 4 to 6m; Described 3rd predeterminable range scope is 5 to 10m; Described 4th predeterminable range scope is 5 to 10m;
Wherein, described preset ratio is 5 to 15%.
The embodiment of the present invention is by carrying out back-up sand operation to artificial bottom of a well; And after back-up sand operation, insert the soft fibre aqueous solution and the resin coated sand aqueous solution; Visit the degree of depth of resin coated sand sand identity distance from well head; Lower brill plug tubing string carries out brill plug resin coated sand plug face; Enter sand-flushing pipe column under after brill plug and carry out sand washing and completion.Utilize high pressure packing soft fibre and resin-coating by the sand gear that goes out in oil reservoir outside oil well, avoid reservoir sand and enter pump barrel and cause holddown, and then cause the problem of well recovery inefficiency, improve the efficiency of oil recovery.
Embodiment two
Embodiments provide a kind of method of wellfracturing sand control, method flow comprises:
First perform the step preparing construction in the embodiment of the present invention, comprising:
Trip out the flow string that well recovery is produced, described flow string comprises oil pipe, sucker rod and oil well pump.
Enter the sand-flushing pipe column with sand-washing pen point under in down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the position of distance between the 5th predeterminable range scope of sand face to the artificial bottom of a well in described oil well well; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point.
In sand-flushing pipe column, pump into sand cleaning fluid carry out sand washing to 1719m; Sand face exceeds artificial bottom of a well 1.8m (artificial bottom of a well 1720.8).
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours; Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 6th predeterminable range scope.
In sand-flushing pipe column, pump into flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 10m
3/ h; Return out after clear water until oil jacket annular space and stop well-flushing; Sand precipitation in oil jacket annular space; Sand setting 2 hours, carry out second time and visit sand face, sand face is at 1717m.
The drifting tubing string entered under in well with drift size gauge tool carries out drifting operation, under the speed of well head by the 3rd pre-set velocity, enter drifting tubing string to artificial bottom of a well; Carry out anti-flushing well to oil well afterwards, pump into clear water cook flushing fluid from oil jacket annular space, described flushing fluid returns out from oil pipe, and the displacement control of described flushing fluid is at 15 ~ 20m
3/ h, treats that returning out clear water from oil pipe stops well-flushing, and trips out drifting tubing string;
Described drifting tubing string comprises oil pipe, oil pipe variable buckle joint and drift size gauge tool; Described drifting tubing string comprises oil pipe from top to bottom from well head, oil pipe lower end connected pipes variable buckle joint, and described oil pipe variable buckle joint lower end connects drift size gauge tool; Described oil pipe, to be threaded connection between described oil pipe variable buckle joint and described drift size gauge tool.
From well head by entering drifting tubing string under 9m/min speed to 1717m; Then carry out anti-flushing well, pump into clear water from oil jacket annular space and cook flushing fluid, flushing fluid returns out from oil pipe, and the displacement control of flushing fluid, at 17m3/h, treats that returning out clear water from oil pipe stops well-flushing.Trip out drifting tubing string.
After execution preparation of construction work, perform the step of sand control operation, comprising:
Enter the back-up sand tubing string with sand-washing pen point under in down-hole casing, described back-up sand tubing string comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point; From described have inside the Pass inject back-up sand liquid, until the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope; The quartz sand of described back-up sand liquid to be particle diameter be 0.4 to 0.8mm and concentration are the mixture of the potassium chloride KCI aqueous solution of 2%, and the percentage by weight of described quartz sand and the KCI aqueous solution is between 5 to 6%; Control pump truck output at 400 to 500L/min.
Concrete, with 400 type pump trucks injection back-up sand liquid in back-up sand tubing string, the quartz sand of back-up sand liquid to be particle diameter be 0.4 ~ 0.8mm and concentration are the mixture of the KCI aqueous solution of 2%, and the percentage by weight of quartz sand and the KCI aqueous solution is between 5.5%; Control 400 type pump truck outputs at 400 ~ 500L/min, make sand face to 1708m (boundary at the bottom of oil reservoir is 1718.1m).
In described back-up sand tubing string, inject flushing fluid carry out direct flushing, described flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 12 hours, treats that the sand sedimentation time arrives by the degree of depth of described back-up sand tubing string detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope.
Concrete, in back-up sand tubing string, pump into flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 10m
3/ h; Return out after clear water until oil jacket annular space and stop well-flushing; Sand precipitation in oil jacket annular space.
On carry described back-up sand tubing string, with the position making described sand-washing pen point be positioned at 4.5 to 5.5m on the circle of oil reservoir top.Described oil pipe is diameter is 73mm external upset tubing; And carry out the operation of mounting shaft mouth.
Concrete, sand setting 12 hours, carries out second time and visits sand face, determine that sand face is to 1708m; On carry oil pipe column, make the position of nib at 1640m (oil reservoir top circle is at 1664.1m).
Further, the operation of installing well head is specially: oil pipe connected pipes is hung, for being threaded between oil pipe with tubing hanger; Tubing hanging seat is inner at the big four of production tree, holds out against jackscrew, installs KCY-65/35 production tree; Production tree is connected by pipeline with pump truck, and pipeline, production tree are adopted with being threaded between pump truck, closes production tree and connects gate, surface line pressure testing 30MPa, voltage stabilizing 1 minute; Stopping is suppressed.
By described back-up sand tubing string to oil well direct circulation prepad fluid, described prepad fluid is the KCI aqueous solution of 2%; In described oil well, the soft fibre aqueous solution 15 to the 25m of 10% is injected when pump pressure is stablized and discharge capacity is stablized
3; After treating that the injection of the described soft fibre aqueous solution is complete, in described oil well, inject de-oiling formation water, treat that pump pressure is stable and discharge capacity is stabilized in 1.2 to 1.6m
3starting during/min in described oil well, inject particle diameter is 0.4 to 0.8mmH
3resin coated sand; Wherein, described de-oiling formation water and described resin coated sand percentage by weight control between preset ratio; When described pressure break pump truck pressure is risen 3 to 5MPa by stable pump pressure when initially adding sand, stop adding resin coated sand in described load fluid, pump truck continues circulation displacement fluid 5 ~ 15m
3, described displacement fluid is de-oiling formation water.
Concrete, on ground with pressure break pump truck direct circulation prepad fluid, prepad fluid is the KCI aqueous solution of 2%; The soft fibre aqueous solution 20m changing injection 10% into is started when pump pressure is stablized and discharge capacity is stablized
3; After the soft fibre aqueous solution has injected, inject de-oiling formation water, treat that pump pressure is stable and discharge capacity is stabilized in 1.5m
3starting during/min to add particle diameter is 0.4 ~ 0.8mm resin coated sand; Load fluid and resin coated sand percentage by weight (taking sand percentage) control 8.5%; When pressure break pump truck pressure is by stable pump pressure rising 5MPa when initially adding sand, stop adding resin coated sand in load fluid, pump truck continues circulation displacement fluid 6.5m
3;
Described back-up sand tubing string is transferred, to detect the degree of depth of resin coated sand plug identity distance from well head in described down-hole casing.
Concrete, transfer back-up sand tubing string and visit resin coated sand plug face; Determine that resin coated sand plug face is at 1663m.
Enter the brill plug tubing string with tricone bit under in described down-hole casing, described brill plug tubing string is oil pipe, screw drill and tricone bit from well head from top to bottom, described oil pipe, is threaded connection between described screw drill and described tricone bit; From well head by entering to bore the position of plug tubing string to described resin coated sand plug identity distance second predeterminable range scope in the degree of depth of well head under the first pre-set velocity; Flushing fluid is injected, discharge capacity 500 to the 600L/min of described flushing fluid in described oil pipe; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid, carry out the operation of brill plug by the second pre-set velocity to enter described brill plug tubing string under default pressurization tonnage; Until stop pressurization when boring 1m under plug to sand face; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid; Trip out described brill plug tubing string; Wherein, when described brill plug tubing string often enters 3 to 5m down, movable described brill plug tubing string is above carried once.
Concrete, from well head by entering to bore plug tubing string under 9m/min speed to 1658.5m; Flushing fluid is injected, the discharge capacity 500L/min of flushing fluid with 400 type pump trucks in oil pipe; When consistent with the flushing fluid that oil pipe enters from oil jacket annular space returning fluid, bore plug by 0.8m/min speed running string, pressurization tonnage controls at 10KN; When brill plug tubing string often enters 5m down, above carry running drill plug tubing string once; When boring plug to 1709m, stop pressurization; When consistent with the flushing fluid that oil pipe enters from oil jacket annular space returning fluid; Trip out and bore plug tubing string.
Enter the sand-flushing pipe column with sand-washing pen point under in described down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the distance of sand face to the artificial bottom of a well in described oil well well in the position of the 3rd predeterminable range scope; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point.
Concrete, in sand-flushing pipe column, pump into sand cleaning fluid carry out sand washing to 1719m.
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours.
Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 4th predeterminable range scope.
Concrete, in sand-flushing pipe column, pump into flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 10m
3/ h; Return out after clear water until oil jacket annular space and stop well-flushing; Sand precipitation in oil jacket annular space; Sand setting 2 hours, carries out second time and visits sand face, determine sand face 1719m.
Carry out well completion operations by the flow string that enters to recover the oil under geological scheme requirement, described oil recovery flow string comprises from top to bottom from well head: the oil pipe that is threaded, oil well pump and back taper; Mast in described oil recovery flow string is combined as: sucker rod connects oil pump plunger piston.
Concrete, downhole production pipe string combination: diameter 70mm oil pipe, length 1542.75m, oil pipe lower end connects sand-preventing pump, sand-preventing pump external diameter 44mm, sand-preventing pump lower end degree of depth 1550.75m; Sand-preventing pump lower end connects starting taper, starting taper diameter 73mm, the starting taper lower end degree of depth 1600.52 meters
Taper of rod: employing be that HY grade pumping rod lower end connects centering sucker rod, centering sucker rod lower end connects sinker bar, and sinker bar lower end connects the plunger of oil well pump.
The embodiment of the present invention is by carrying out back-up sand operation to artificial bottom of a well; And after back-up sand operation, insert the soft fibre aqueous solution and the resin coated sand aqueous solution; Visit the degree of depth of resin coated sand sand identity distance from well head; Lower brill plug tubing string carries out brill plug resin coated sand plug face; Enter sand-flushing pipe column under after brill plug and carry out sand washing and completion.Utilize high pressure packing soft fibre and resin-coating by the sand gear that goes out in oil reservoir outside oil well, avoid reservoir sand and enter pump barrel and cause holddown, and then cause the problem of well recovery inefficiency, improve the efficiency of oil recovery.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only storage, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method for wellfracturing sand control, is characterized in that, described method comprises:
Enter the back-up sand tubing string with sand-washing pen point under in down-hole casing, described back-up sand tubing string comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point; From described have inside the Pass inject back-up sand liquid, until the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope; The quartz sand of described back-up sand liquid to be particle diameter be 0.4 to 0.8mm and concentration are the mixture of the potassium chloride KCI aqueous solution of 2%, and the percentage by weight of described quartz sand and the KCI aqueous solution is between 5 to 6%; Control pump truck output at 400 to 500L/min;
In described back-up sand tubing string, inject flushing fluid carry out direct flushing, described flushing fluid returns out ground from oil jacket annular space, and the displacement control of flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 12 hours, treats that the sand sedimentation time arrives by the degree of depth of described back-up sand tubing string detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the first predeterminable range scope;
On carry described back-up sand tubing string, with the position making described sand-washing pen point be positioned at 4.5 to 5.5m on the circle of oil reservoir top.Described oil pipe is diameter is 73mm external upset tubing; And carry out the operation of mounting shaft mouth;
By described back-up sand tubing string to oil well direct circulation prepad fluid, described prepad fluid is the KCI aqueous solution of 2%; In described oil well, the soft fibre aqueous solution 15 to the 25m of 10% is injected when pump pressure is stablized and discharge capacity is stablized
3; After treating that the injection of the described soft fibre aqueous solution is complete, in described oil well, inject de-oiling formation water, treat that pump pressure is stable and discharge capacity is stabilized in 1.2 to 1.6m
3starting during/min in described oil well, inject particle diameter is 0.4 to 0.8mmH
3resin coated sand; Wherein, described de-oiling formation water and described resin coated sand percentage by weight control between preset ratio; When described pressure break pump truck pressure is risen 3 to 5MPa by stable pump pressure when initially adding sand, stop adding resin coated sand in described load fluid, pump truck continues circulation displacement fluid 5 ~ 15m
3, described displacement fluid is de-oiling formation water;
Described back-up sand tubing string is transferred, to detect the degree of depth of resin coated sand plug identity distance from well head in described down-hole casing;
Enter the brill plug tubing string with tricone bit under in described down-hole casing, described brill plug tubing string is oil pipe, screw drill and tricone bit from well head from top to bottom, described oil pipe, is threaded connection between described screw drill and described tricone bit; From well head by entering to bore the position of plug tubing string to described resin coated sand plug identity distance second predeterminable range scope in the degree of depth of well head under the first pre-set velocity; Flushing fluid is injected, discharge capacity 500 to the 600L/min of described flushing fluid in described oil pipe; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid, carry out the operation of brill plug by the second pre-set velocity to enter described brill plug tubing string under default pressurization tonnage; Until stop pressurization when boring 1m under plug to sand face; When consistent with the character of the flushing fluid that described oil pipe enters from described oil jacket annular space returning fluid; Trip out described brill plug tubing string; Wherein, when described brill plug tubing string often enters 3 to 5m down, movable described brill plug tubing string is above carried once;
Enter the sand-flushing pipe column with sand-washing pen point under in described down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the distance of sand face to the artificial bottom of a well in described oil well well in the position of the 3rd predeterminable range scope; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours;
Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 4th predeterminable range scope;
Carry out well completion operations by the flow string that enters to recover the oil under geological scheme requirement, described oil recovery flow string comprises from top to bottom from well head: the oil pipe that is threaded, oil well pump and back taper; Mast in described oil recovery flow string is combined as: sucker rod connects oil pump plunger piston.
2. method according to claim 1, is characterized in that, described first pre-set velocity is 8 to 10m/min; Described second pre-set velocity is 0.5 to 1m/min.
3. method according to claim 1, is characterized in that, described first predeterminable range scope is 8 to 12m; Described second predeterminable range scope is 4 to 6m; Described 3rd predeterminable range scope is 5 to 10m; Described 4th predeterminable range scope is 5 to 10m.
4. method according to claim 1, is characterized in that, described preset ratio is 5 to 15%.
5. method according to claim 1, is characterized in that, described in down-hole casing under enter with sand-washing pen point back-up sand tubing string before, described method also comprises:
Trip out the flow string that well recovery is produced, described flow string comprises oil pipe, sucker rod and oil well pump;
Enter the sand-flushing pipe column with sand-washing pen point under in down-hole casing, in described sand-flushing pipe column, inject sand cleaning fluid carry out sand washing; Until sand washing reaches the position of distance between the 5th predeterminable range scope of sand face to the artificial bottom of a well in described oil well well; Described sand-flushing pipe column comprises oil pipe, sand-washing pen point from top to bottom from well head, is threaded connection between described oil pipe and described sand-washing pen point;
In described sand-flushing pipe column, inject flushing fluid carry out direct flushing, flushing fluid returns out ground from oil jacket annular space, and the displacement control of described flushing fluid is at 8 to 14m
3/ h; Well-flushing is stopped after described oil jacket annular space returns out clear water; The sand carried out in described oil jacket annular space precipitates 2 hours; Treat that the sand sedimentation time arrives by the degree of depth of described sand-flushing pipe column detection sand identity distance from well head, to determine the position of the distance on boundary at the bottom of sand face to oil reservoir between the 6th predeterminable range scope;
The drifting tubing string entered under in well with drift size gauge tool carries out drifting operation, under the speed of well head by the 3rd pre-set velocity, enter drifting tubing string to artificial bottom of a well; Carry out anti-flushing well to oil well afterwards, pump into clear water cook flushing fluid from oil jacket annular space, described flushing fluid returns out from oil pipe, and the displacement control of described flushing fluid is at 15 ~ 20m
3/ h, treats that returning out clear water from oil pipe stops well-flushing, and trips out drifting tubing string;
Described drifting tubing string comprises oil pipe, oil pipe variable buckle joint and drift size gauge tool; Described drifting tubing string comprises oil pipe from top to bottom from well head, oil pipe lower end connected pipes variable buckle joint, and described oil pipe variable buckle joint lower end connects drift size gauge tool; Described oil pipe, to be threaded connection between described oil pipe variable buckle joint and described drift size gauge tool.
6. method according to claim 5, is characterized in that, described 3rd pre-set velocity is 8 ~ 10m/min.
7. method according to claim 5, is characterized in that, described 5th predeterminable range scope is 5 to 10m; Described 6th predeterminable range scope is 5 to 10m.
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| CN107575186A (en) * | 2017-09-12 | 2018-01-12 | 西南石油大学 | One kind crosses screen casing sand-preventing process |
| CN114135250A (en) * | 2020-09-04 | 2022-03-04 | 中国石油天然气股份有限公司 | Casing deformation well sand prevention method and device |
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| CN105569626B (en) | 2018-01-05 |
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