CN201412106Y

CN201412106Y - Well-head protector

Info

Publication number: CN201412106Y
Application number: CN200920140204XU
Authority: CN
Inventors: 崔龙兵; 董乃仕; 田峰; 贾书杰; 柳志翔
Original assignee: 中国石油化工股份有限公司
Priority date: 2009-05-31
Filing date: 2009-05-31
Publication date: 2010-02-24

Abstract

The utility model relates to a well-head protector which comprises an upper connector, and an injection barrel, a middle connector, a piston barrel, a lower connector and a central pipe which are screwed with the upper connector in sequence, a middle hydraulic power line and a lower hydraulic power line which are respectively communicated with the middle connector and the lower connector, and a three-position four-way valve and a hydraulic pump which are connected behind the middle and the lower hydraulic power lines in series, wherein the upper end of the injection barrel is screwed with theupper connector, and the lower end thereof is screwed with the middle connector; the middle connector is communicated with the middle hydraulic power line, and the lower thread mouth thereof is screwed with the piston barrel; the lower connector is screwed below the piston barrel, the upper part thereof is communicated with the lower hydraulic power line, the lower part thereof is communicated with a stop valve, and a pressure gauge is connected behind the stop valve in series; and the central pipe is wholly inserted into the injection barrel and the piston barrel, the middle hydraulic power line and the lower hydraulic power line are both communicated with the three-position four-way valve, and the hydraulic pump is connected thereafter. The well-head protector effectively protects the low-pressure-grade well-head used in acid fracturing, thus saving investment cost for well-head; and the well-head protector can meet the technical requirements of ultrahigh-pressure and large-delivery-volume acid fracturing, is safe and reliable, and convenient in operation.

Description

Tree protector

One, technical field:

The utility model relates to the tree protector that a kind of oil field plays a protective role to low-pressure rank well head in the acid fracturing operation.

Two, background technology:

The acid fracturing operation is that oilfield reservoir is transformed the routine techniques means, also is product measure in the most effective volume increase in oil field.Well head pressure after well head pressure during the acid fracturing operation is gone into operation much larger than the oil gas well, but for satisfy acidizing fracturing process needs, must use other well head of pressure level, particularly for the well of deep-well, ultradeep well or unusual formation fracture pressure, when acidifying pressure fracturing work, must use more other well head of pressure level, this has just increased the cost of investment of oil gas well.

Three, summary of the invention:

The purpose of this utility model is to propose a kind of acidification of oil field fracturing technology needs that satisfy, and saves oil gas well well head cost of investment, is particularly useful for the tree protector of hyperpressure acid fracturing operation.

The purpose of this utility model is achieved in that tree protector comprises top connection, successively the injecting tube that spins with top connection, transition joint, piston cylinder, lower contact, central tube, the middle hydraulic line that is communicated with transition joint and lower contact, hydraulic line down.And three-position four-way valve and hydraulic pump in being connected on, behind the following hydraulic line.Injecting tube upper end spins with top connection, the lower end transition joint that spins.Transition joint middle part be the boss of center drilling, and the boss bottom has the hydraulic oil channel hole with the centre bore connection, hydraulic line in the connection, the following screw thread mouth of the transition joint piston cylinder that spins.Lower contact is screwed under the piston cylinder, and it is the boss of central hole, and boss top has the hydraulic oil through hole that is communicated with centre bore, and it is communicated with hydraulic line down, and the boss bottom has fluid through-hole, and it is communicated with stop valve, the pressure meter of connecting behind the stop valve.Central tube is whole to be inserted in injecting tube and the piston cylinder, and middle hydraulic line and following hydraulic line all are communicated with a three-position four-way valve, connect hydraulic pump thereafter.

The utility model has played effective protective effect to the low-pressure rank well head that uses in the acid fracturing operation, saved the well head cost of investment.Can satisfy the requirement of super-pressure, big discharge capacity acidizing fracturing process.Have characteristics such as safe and reliable, simple in structure, easy to operate.

Four, description of drawings:

Concrete structure of the present utility model is provided by following drawings and Examples:

Fig. 1 is the tree protector structural representation;

Fig. 2 is tree protector and well head assembly structure schematic diagram.

Legend: 1, top connection, 2, sealing ring, 3, injecting tube, 4, transition joint, 5, piston cylinder, 6, pressure meter, 7, stop valve, 8, lower contact, 9, central tube, 10, three-position four-way valve, 11, hydraulic pump, 12, operating grip, 13, reversing handle, 14, middle hydraulic line, 15, hydraulic line down, 16, fill nipple, 17, wax removal valve, 18, production tree, 19, the main valve plate, 20, the boll-weevil hanger assembly, 21, oil recovery four-way, 22, casing head, 23, oil pipe.

Five, the specific embodiment:

The utility model is not subjected to the restriction of following embodiment, can determine concrete embodiment according to the technical solution of the utility model and actual conditions.

Embodiment: shown in Fig. 1-2; tree protector comprises top connection (1), successively the injecting tube (3) that spins with top connection (1), transition joint (4), piston cylinder (5), lower contact (8), central tube (9), the middle hydraulic line (14) that is communicated with transition joint (4) and lower contact (8), hydraulic line (15) down.And be connected on three-position four-way valve (10), hydraulic pump (11) behind middle hydraulic line (14) and the following hydraulic line (15).

Top connection (1) has the cavity body of through hole for the center, and two ends are provided with internal thread, and following stomidium inwall has seal groove.Injecting tube (3) has the cavity body of through hole for the center, and two ends are provided with external screw thread and sealed step, the outer jacket sealing ring (2) of sealed step, and sealing ring (2) places in the aforementioned seal groove.Injecting tube (3) upper end spins with top connection (1), the lower end transition joint (4) that spins.Transition joint (4) has the cavity body of through hole for the center, the middle part is the boss of center drilling, its both ends of the surface are provided with inner thread mouth, boss inwall and two screw thread mouth inwalls all have seal groove, be provided with sealing ring (2) in the seal groove, the boss bottom has the hydraulic oil channel hole that is communicated with centre bore, hydraulic line in the connection (14), the following screw thread mouth piston cylinder (5) that spins.Piston cylinder (5) is the cavity body of central hole, and two ends are provided with external screw thread and sealed step.Lower contact (8) is screwed under the piston cylinder (5), it is the boss of central hole, the upper end is provided with inner thread mouth, the lower end is provided with flange, is provided with seal groove in the hole, and boss top has the hydraulic oil through hole that is communicated with centre bore, it is communicated with hydraulic line (15) down, the boss bottom has fluid through-hole, and it is communicated with stop valve (7), stop valve (7) back series connection pressure meter (6).Boss inwall between hydraulic oil through hole and fluid through-hole and two screw thread mouth inwalls all have seal groove, are provided with sealing ring (2) in it.

Central tube (9) is whole to be inserted in injecting tube (3) and the piston cylinder (5), and upper port is positioned at injecting tube (3), is in the central through hole below of top connection (1).Central tube (9) is the cavity body of central hole, and the lower end is processed with seal groove, its outer sealing ring (2) that is with.The central tube (9) that is positioned between transition joint (4) and lower contact (5) is provided with piston, and piston outer wall has seal groove, and is with sealing ring (2).

In hydraulic line (14) and following hydraulic line (15) all be communicated with a three-position four-way valve (10), connect hydraulic pump (11) thereafter, its with two pipelines that hydraulic pump (11) is connected on pressure meter (6) all is set.Pressure meter (6) is used to monitor the interior hydraulic working oil pressure of piston cylinder (5).

The utility model and well head scene are used process: in terrestrial operation hydraulic pump (11), pull the reversing handle (13) of operating grip (12) and three-position four-way valve (10), hydraulic oil enters piston cylinder (5) lower lumen.Central tube (9) upper end upwards slides into the inner chamber top of piston cylinder (5); the tree protector of slinging is fastenedly connected by the flange of lower contact (8) and the wax removal valve (17) on the well head production tree (18), and central tube (9) extend into main valve plate (19) top of well head production tree (18).Operation reversing handle (13), inject hydraulic oil to piston cylinder (5) top inner chamber, central tube (9) slides to piston cylinder (5), the lower end of central tube (9) band sealing ring extend into carries out seat in the closed hole at boll-weevil hanger assembly (20) endoporus middle part and seals, central tube (9), boll-weevil hanger assembly (20), oil pipe (24) and injecting tube (3) just form a closed channel that can bear high pressure or super-pressure like this, and piston cylinder (5) top inner chamber keeps the pressure of central tube (9) seat envelope.The fill nipple (16) that connects top connection (1) top, the airtight airtight passage of acid fracturing liquid process is pumping liquid in well continuously, carries out the acid fracturing process.Behind the intact liquid of infusion; operation reversing handle (13); inject hydraulic oil to piston cylinder (5) lower lumen; the main valve plate (19) of central tube (9) on piston cylinder (5) slip, production tree (18) finished the action of central tube (9) deblocking; close production tree subsequently; lay down the pressure in the central tube (9), mention tree protector, close wax removal valve (17) and get final product.

Above technical characterictic has constituted most preferred embodiment of the present utility model, and it has stronger compliance and best implementation result, can increase and decrease inessential technical characterictic according to actual needs, satisfies the needs of different situations.

Claims

1; a kind of tree protector; comprise top connection; the injecting tube that spins with top connection successively; transition joint; piston cylinder; lower contact; central tube; the middle hydraulic line that is communicated with transition joint and lower contact; following hydraulic line; and three-position four-way valve and the hydraulic pump behind the hydraulic line in being connected on; it is characterized in that: the injecting tube upper end spins with top connection; the lower end transition joint that spins; hydraulic line during transition joint is communicated with; the following screw thread mouth of the transition joint piston cylinder that spins; lower contact is screwed under the piston cylinder; lower contact top is communicated with hydraulic line down; the bottom is communicated with stop valve, the pressure meter of connecting behind the stop valve, and central tube is whole to be inserted in injecting tube and the piston cylinder; middle hydraulic line and following hydraulic line all are communicated with a three-position four-way valve, connect hydraulic pump thereafter.

2, tree protector as claimed in claim 1 is characterized in that: top connection is the cavity body that the center has through hole, and two ends are provided with internal thread, and following stomidium inwall has seal groove.

3, tree protector as claimed in claim 1 is characterized in that: injecting tube is the cavity body that the center has through hole, and two ends are provided with external screw thread and sealed step, the outer jacket sealing ring of sealed step, and sealing ring places in the aforementioned seal groove.

4, tree protector as claimed in claim 1; it is characterized in that: transition joint is the cavity body that the center has through hole; the middle part is the boss of center drilling; the boss bottom has the hydraulic oil channel hole that is communicated with centre bore; the boss both ends of the surface are provided with inner thread mouth; boss inwall and two screw thread mouth inwalls all have seal groove, are provided with sealing ring in the seal groove.

5, tree protector as claimed in claim 1 is characterized in that: piston cylinder is the cavity body of central hole, and two ends are provided with external screw thread and sealed step.

6, tree protector as claimed in claim 1; it is characterized in that: lower contact is the boss of central hole; lower contact boss upper end is provided with inner thread mouth; the lower end is provided with flange; be provided with seal groove in the hole, boss top has the hydraulic oil through hole that is communicated with centre bore, following hydraulic line; the boss bottom has fluid through-hole, is communicated with stop valve.

7, tree protector as claimed in claim 6 is characterized in that: boss inwall between hydraulic oil through hole and fluid through-hole and two screw thread mouth inwalls all have seal groove, are provided with sealing ring in it.

8, tree protector as claimed in claim 1 is characterized in that: the central tube upper port is positioned at injecting tube, is in the central through hole below of top connection.

9, tree protector as claimed in claim 1 is characterized in that: central tube is the cavity body of central hole, and the lower end is processed with seal groove; its outer sealing ring that is with; the central tube that is positioned between transition joint and lower contact is provided with piston, and piston outer wall has seal groove, and is with sealing ring.

10, tree protector as claimed in claim 1 is characterized in that: on two pipelines that three-position four-way valve is connected with hydraulic pump pressure meter is set all.