CN107795297A - Multistage a chain of Cut Block blocking - Google Patents

Abstract

The invention provides a kind of new " multistage a chain of Cut Block blocking " device, including：Top hollow base blocking, the hollow pressure transmission connecting rod in top；Middle part hollow base blocking, the hollow pressure transmission connecting rod in middle part；Bottom solid seat blocking；And one group of shear pin composition.The present invention is put on ground；Underground is fallen into oil pipe or sleeve pipe, reaches underground sliding sleeve position.High angle well section or net horizontal section when；Completion fluid or mud are pumped by ground, " multistage a chain of Cut Block blocking " is pushed into underground sliding sleeve position；Then, ground is suppressed, and opens underground sliding sleeve.Without steel wire operation；It is sent into without cable；Without continuous oil pipe operation；Without hydraulic control lines operation outside oil pipe, one time input " multistage a chain of Cut Block blocking " is continuously finished and is turned on and off multiple sliding sleeves, saves rig time.It can also substitute steel wire, cable can not reach, can not the High angle well section of operation, net horizontal section be continuously finished and be turned on and off multiple sliding sleeves, save cost.It is turned on and off after multiple sliding sleeves terminate, oil gas normally produces in oil pipe, saves cost；Depth of setting and oil gas well yield are unrestricted.

Description

Multi-stage chain shear seat seal ball

technical field

The invention relates to the technical fields of oil and gas well completion operations, fracturing operations and cementing downhole tools, in particular to a multi-stage serial shearing seat sealing ball device.

Background technique

For more than 100 years, well completion (well completion) is the process of connecting the bottom of the well with the oil layer in a certain structure after the open-hole well is drilled to the designed depth in oil production. The beginning of the project is closely connected with the subsequent oil recovery, water injection and the development of the entire oil and gas field. The quality of oil well completion directly affects the production capacity and economic life of the oil well, and even relates to whether the entire oil field can be developed reasonably.

On the completion strings widely used in modern times, in order to effectively mine in layers and increase production, sliding sleeves must be installed; the original sliding sleeve needs to be lowered into a wire well sliding sleeve switching tool; or a cable well sliding sleeve switching tool; or continuous The tubing well slides the sleeve switch tool to open or close.

Therefore, the related supporting equipment of the sliding sleeve can be widely used, and the downhole sliding sleeve opening and closing tool is one of the widely used tools in the process of opening and closing the sliding sleeve.

At present, there are two main forms of downhole sleeve switch tools at home and abroad:

The first is to go down into the steel wire downhole sliding sleeve switch tool by steel wire or cable. The disadvantage of this operation is that a wire winch and a diesel engine power unit are required, as well as a ground wire blowout preventer; a wire blowout preventer; a wire blowout preventer box; ; Mechanical jars or hydraulic jars; universal joints; wire rope caps, increasing the workload.

The second type of coiled tubing operation: downhole hydraulic sliding sleeve switch tool for running into coiled tubing. The disadvantage of this operation is that coiled tubing is required; diesel engine power unit must have ground gooseneck power unit; coiled tubing blowout preventer; surface pump; ; hydraulic jar; weighted rod; hydraulic accelerator; check valve; coiled tubing joint; increased workload. In the process of opening and closing, the pump should also be turned on for positive circulation, and the coiled tubing should be lifted and pressed down.

At the same time, due to the limitation of the lifting capacity of the operating equipment and the signal display requirements for the opening of the sliding sleeve, it is sometimes difficult to open and close the sliding sleeve.

Contents of the invention

The purpose of the present invention is to provide a multi-stage serial shearing seat sealing ball device, which can open multi-stage sliding sleeves and ensure the oil and gas production of the wellbore with one input.

The present invention provides a multi-stage chain shearing seat sealing device, comprising: an upper hollow seat sealing ball, a hollow pressure transmission connecting rod; a middle hollow seat sealing ball, a hollow pressure transmission connecting rod; a lower seat sealing ball; and a set of Shear pin composition. ;

The upper hollow sealing ball includes a hollow sealing ball, a hollow pressure transmission connecting rod and a pin hole, and the devices are all composed of soluble materials;

The hollow sealing ball in the middle includes a hollow sealing ball, a hollow pressure transmission connecting rod and a pin hole, and the devices are all made of soluble metal materials;

The upper end of the lower sealing ball has a pin hole, and the hollow pressure transmission connecting rod of the hollow sealing ball is connected with the shear pin; the devices are all made of soluble metal materials;

When the present invention is lowered into an oil well or a natural gas well, all sliding sleeves are in an open state. The upper hollow seat sealing ball is stuck in the limit part of the inner bush of the first sliding sleeve, and the ground is pressurized to close the first sliding sleeve.

Continue to pressurize, shear the pin at the bottom of the hollow pressure transmission connecting rod of the hollow seat seal ball on the top. The hollow seat sealing ball in the middle goes down and is stuck in the limit part of the inner bush of the second sliding sleeve, and the ground is pressurized to close the second sliding sleeve.

Continue to pressurize, shear the pin at the bottom of the hollow pressure transmission connecting rod of the hollow seat seal ball in the middle. The lower seating ball continues to descend until it reaches the limit portion of the inner bushing of the third sliding sleeve, and the ground is pressurized to close the third sliding sleeve.

Further, the multi-stage chain shear seating ball is made of soluble metal.

After 2-10 days, the multi-stage chain shearing sealing ball will dissolve in the well fluid, which can ensure the diameter of the wellbore to the greatest extent, and there will be no residual debris, which can effectively ensure the cleanliness and smoothness of the oil and gas well.

Compared with the existing technology, the multi-stage chain shearing and sealing ball device provided by the present invention has the following advantages:

1. With the input at the wellhead, it falls into the sliding sleeve in the tubing, and in the horizontal well section, it is assisted by pumping completion fluid into the sliding sleeve. It is lowered in one trip, and the operation is completed continuously in one trip, saving time;

2. There is no need to replace the downhole sliding sleeve switch tool, and it will not pollute the formation;

3. After closing the sliding sleeve, the original diameter of the tubing remains, which facilitates subsequent workover operations.

4. There is no need for a large number of additional ground equipment, which saves costs;

5. There are no restrictions on the depth of entry and the flow rate of oil and gas wells.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural representation when the present invention is just lowered into the well (also lowered in the first sliding sleeve);

Fig. 2 is a schematic structural view after opening the first sliding sleeve (staying in the first sliding sleeve) in the present invention;

Fig. 3 is the structural representation when the present invention is lowered into the second sliding sleeve;

Fig. 4 is a schematic structural view of opening the second sliding sleeve (staying in the second sliding sleeve) in the present invention;

Fig. 5 is a schematic structural view of the present invention after entering the third sliding sleeve (staying in the third sliding sleeve);

Fig. 6 is the shear pin of the present invention (stayed in the first sliding sleeve), and after the hydraulic pressure opens the first sliding sleeve, after the shear pin is cut off, the structural schematic diagram of the pin remaining in the first sliding sleeve

Fig. 7 is the shearing pin of the present invention (staying in the second sliding sleeve); and after the hydraulic pressure opens the second sliding sleeve, after the shearing pin is cut off, the structural schematic diagram of the pin remaining in the second sliding sleeve

Reference signs:

1-The upper hollow seat seals the ball; 2-The middle hollow seat seals the ball;

3-The lower solid seat seal ball; 4-The upper shear pin;

5 - lower shear pin;

11-upper hollow pressure transmission connecting rod; 21-lower hollow pressure transmission connecting rod

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Fig. 1 is the structural schematic view of the multi-stage chain shear seat seal ball when the present invention has just been lowered into the well; Fig. 2 is after the first sliding sleeve is hydraulically opened by the multi-stage chain shear seat seal ball in the present invention, after shearing the pin (leave in the first sliding sleeve); Fig. 3 is a schematic structural view of the multi-stage chain shearing seat seal ball in the present invention when it is lowered into the second sliding sleeve; Fig. 4 is a hydraulic pressure diagram of the multi-stage chain shear seat seal ball of the present invention After opening the second sliding sleeve, the structural schematic diagram after shearing the pin (staying in the second sliding sleeve); Fig. Schematic diagram of the structure of the three sliding sleeves).

As shown in Figure 1, the present invention provides a new type of "multi-stage chain shearing seat sealing ball" device, including: the upper hollow seat sealing ball, the upper hollow pressure transmission connecting rod; the middle hollow seat sealing ball, the middle hollow pressure transmission The connecting rod; the lower solid seat ball; and a set of shear pins.

The upper hollow seat seal ball 1, the lower end of the hollow pressure transmission connecting rod 11 is equipped with a lower joint 12, and the lower side wall of the hollow pressure transmission connecting rod 11 is provided with a threaded hole 13, and the threaded hole 13 is closely connected with the shear pin 4. Cooperate; the upper joint 22 is installed on the upper end of the hollow seat sealing ball 2 with the screw hole 13 and the middle hollow pressure transmission connecting rod 21; the upper side wall of the middle hollow pressure transmission connecting rod 21 is provided with a screw groove 23. The pits 13 are closely matched with the shear pins 4 to jointly connect the upper hollow seat sealing ball 1 , the hollow pressure transmission connecting rod 11 and the middle hollow seat sealing ball 2 and the middle hollow pressure transmission connecting rod 21 .

The upper hollow seat sealing ball 1 can closely fit with the sliding sleeve of the first downhole sliding sleeve; the ground pressurizes to open the first downhole sliding sleeve.

The hollow seat sealing ball 2 in the middle can closely fit with the sliding sleeve of the second downhole sliding sleeve; the second downhole sliding sleeve can be opened by pressurization on the ground.

The lower solid seat sealing ball 3 can closely fit with the sliding sleeve of the third downhole sliding sleeve; the third downhole sliding sleeve can be opened by pressurization on the ground.

In this embodiment, when the present invention is lowered into an oil well or a natural gas well, the upper hollow seat ball 1 is stuck in the inner liner of the first sliding sleeve, and the circulation hole of the first sliding sleeve is opened to ensure that the present invention is initially lowered into the oil well or natural gas well. During the well, the circulation hole of the first sliding sleeve is in a blocked state. Continue to pressurize, after shearing the upper shear pin 4, the middle hollow seat sealing ball and the lower solid seat sealing ball continue to be lowered into the second sliding sleeve. The hollow seat ball 2 in the middle is stuck in the inner liner of the second sliding sleeve, pressurization is continued, and the circulation hole of the second sliding sleeve is opened to ensure that when the present invention is initially lowered into an oil well or a natural gas well, the circulation hole of the second sliding sleeve is at blocked state.

Continue to pressurize, after shearing the lower shearing pin 5, the lower solid seat sealing ball 3 continues to be lowered into the third sliding sleeve.

Compared with the existing technology, a novel device for opening downhole sliding sleeves provided by the present invention has the following advantages:

1. Ground input; continuous completion, saving time;

2. No need for steel wire ground equipment, no need for steel wire downhole tools; no need for steel wire downhole operations, and will not pollute the formation;

3. No need for cable ground equipment, no need for cable downhole tools; no need for cable downhole operations, and will not pollute the formation;

4. No need for coiled tubing surface equipment, no need for coiled tubing downhole tools; no need for coiled tubing downhole operations, and will not pollute the formation;

5. Ground control cabinet without hydraulic control pipeline; no hydraulic control pipeline operation outside oil pipe;

6. After the operation is completed, the tubing remains full-bore, which facilitates subsequent workover operations and saves costs;

7. The number and depth of running can be adjusted continuously to increase the number of stages.

8. The multi-stage chain shearing seat sealing ball is made of soluble metal (except the shearing pin).

9. After 2-15 days, the multi-stage chain shearing sealing balls 1, 2, and 3 are dissolved in the well fluid, which can ensure the full diameter of the wellbore to the greatest extent, and the diameter remains consistent with the diameter of the outer casing. And there will be no residual debris, which can effectively ensure the cleanliness and smoothness of oil and gas wells.

The working principle of the present invention is as follows:

In this embodiment, the multi-stage chain shearing seat sealing ball is thrown from the ground; the upper hollow seat sealing ball and the upper hollow pressure transmission connecting rod clamp the inner bushing of the first sliding sleeve; the ground is pressurized; the first sliding sleeve is opened downward. set. Continue to pressurize the ground (increase the ground pressure); until the shear pin 4 is sheared off; release the hollow ball seat 2 in the middle part of Figure 3; the upper hollow seat sealing ball 1 and the upper hollow pressure transmission connecting rod 11 in Figure 2 And the part shearing pin 41 that shears off stays in the threaded hole 13 of upper hollow pressure transmission connecting rod 11.

The middle hollow ball seat 2 and the lower solid seat seal the ball 3; continue to descend; the middle hollow ball seat 2 blocks the inner bushing of the second sliding sleeve; pressurize the ground; open the second sliding sleeve downward. Continue to pressurize the ground (raise the ground pressure); until the shear pin 5 is cut off; release the lower solid seat ball 3 in Figure 5; the middle hollow seat ball 2 and the middle hollow pressure transmission connecting rod 21 in Figure 3 And the part shearing pin 51 that shears off stays in the threaded hole 25 of central hollow pressure transmission connecting rod 21.

Bottom solid seat seal ball 3; continue to descend; block the inner liner of the third sliding sleeve; pressurize the ground; open the second sliding sleeve downwards.

To achieve the purpose of opening the first sliding sleeve, the second sliding sleeve, and the third sliding sleeve, and opening three different oil reservoirs; or the production or fracturing operations of three different gas layers or water layers; - After 10 days, all dissolved in the well fluid, formation oil and gas flows into the sliding sleeve.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (9)

1. A multi-stage chain shearing ball sealing device, characterized in that it comprises: an upper hollow sealing ball, a middle hollow sealing ball, a lower sealing ball; and a set of shearing pins. The lower end of the upper hollow seat sealing ball is equipped with a hollow pressure transmission connecting rod and a pin hole, the lower end of the hollow seat sealing ball in the middle is equipped with a hollow pressure transmission connecting rod and a pin hole, and the upper end of the lower seat sealing ball has a pin hole. The hollow pressure transmission connecting rod of the hollow seat sealing ball is connected with the shear pin. The upper hollow sealing ball includes a hollow sealing ball, a hollow pressure transmission connecting rod and a pin hole, and the devices are all composed of soluble materials; The hollow sealing ball in the middle includes a hollow sealing ball, a hollow pressure transmission connecting rod and a pin hole, and the devices are all made of soluble metal materials. 2. The multi-stage chain shearing sealing ball device according to claim 1, characterized in that the upper hollow sealing ball is made of soluble metal. 3. The multi-stage chain shearing and sealing ball device according to claim 1 or 2, characterized in that the soluble ball comprises a structure composed of a plurality of hollow balls with outer diameters ranging from large to small. 4. The multi-stage chain shearing seat sealing ball device according to claim 3, characterized in that, the outer diameter of the hollow seat sealing ball in the upper part is larger than the outer diameter of the hollow seat sealing ball in the middle part; The hollow seating ball is larger than the outer diameter of the lower seating ball. 5 . The multi-stage chain shearing seat sealing ball device according to claim 4 , characterized in that, the hollow pressure transmission connecting rod has a thread matched with the shearing pin. 6 . 6. The multi-stage chain shearing sealing ball device according to claim 5, characterized in that, the upper connecting rod of the lower sealing ball is solid. 7. The multi-stage chain shearing and sealing ball device according to claim 6, characterized in that the upper connecting rod of the lower sealing ball is threaded with the shearing pin. 8. The multi-stage chain shear seat sealing device according to claim 1, characterized in that the hollow pressure transmission connecting rod is in the shape of a ring; the lower end has an inner step; and a threaded pin hole is processed. 9. The multi-stage chain shearing seat sealing ball device according to claim 1, characterized in that, the lower end has an inner step and a limiting step is arranged on the inner side of the circumferential direction.