CN110130857A - An open-hole horizontal well flow regulation and water control device and a balanced oil recovery process string - Google Patents

Abstract

The invention belongs to the technical field of flow regulating and water controlling devices, and particularly relates to a flow regulating and water controlling device of an open hole horizontal well and a balanced oil production process tubular column. The invention can reduce the flow velocity of stratum fluid, balance the liquid production profile, prevent or limit the flow of non-oil fluid, reduce the water content of liquid in the pipe, promote the balanced oil production of the whole horizontal section, eliminate dead zones, improve the oil production and the recovery ratio, integrate sand control, oil and water stabilization and yield increase into a whole, and have simple and convenient operation, economy and practicability.

Description

An open-hole horizontal well flow regulation and water control device and a balanced oil recovery process string

technical field

The invention belongs to the technical field of flow regulation and water control devices, and in particular relates to a flow regulation and water control device for open-hole horizontal wells and a balanced oil production process string.

Background technique

As a key means of oil and gas field development, horizontal wells have been widely used in various oil fields. For homogeneous reservoirs, the horizontal section of the horizontal well is affected by friction along the way during production, and the pressure drop and flow rate at the heel end are much larger than those at the toe end; for heterogeneous oil reservoirs, the fluid in the high permeability section The heel-toe effect is particularly obvious when advancing forward. Due to the resulting uneven profile in the horizontal section, bottom water coning is very likely to occur in the section with formation water, which will hinder the flow of formation oil at the toe end, affect the productivity of the horizontal well, and seriously cause water flooding or even scrap the oil well.

The flow-regulating and water-controlling screen tube completion technology limits the liquid production at the heel and high-permeability section of the horizontal well by increasing the additional pressure difference, automatically balances the production pressure difference profile and the liquid production profile, prolongs the water-free oil production period of the oil well, and delays the water cut rise rate , to increase oil well production.

The existing flow regulation and water control device reduces the inflow velocity of formation fluid by increasing the flow pressure drop, and has a single function, which can only delay coning to a certain extent.

Contents of the invention

The purpose of the present invention is to provide an open-hole horizontal well flow control and water control device and a balanced oil recovery process string that can not only reduce the flow rate of formation fluid, but also realize the functions of water blocking and water control when the wellbore sees water.

The purpose of the present invention is achieved through the following technical solutions:

The open-hole horizontal well flow regulation and water control device and the balanced oil recovery process string of the present invention are characterized in that they include a base pipe, a screen collar threaded to the upper end of the base pipe, and a lower joint connected to the lower end of the base pipe, The support sleeve sleeved in the middle of the base pipe, the restrictor sleeved on the upper outer surface of the base pipe, and the nozzle abutting against the lower end of the restrictor is located between the nozzle and the support sleeve, And the limiting sleeve fixed on the outer surface of the base pipe is arranged on the outer surface of the restrictor, the nozzle and the outer surface of the limiting sleeve, and is arranged on the outer surface of the nozzle, the outer cover, the limiting sleeve and the base pipe. Several plugging balls in the chamber, several liquid outlet holes arranged above the restrictor and on the upper surface of the base pipe, a composite screen assembly sleeved on the lower part of the base pipe, and the Fixed end ring for threaded connection on the lower part of the base pipe,

The outermost upper end of the composite screen assembly is welded to the support sleeve, and the outermost lower end of the composite screen assembly is welded to the fixed end ring,

The upper end of the jacket is welded to the upper part of the base pipe, and the lower end of the jacket is welded to the support sleeve, and the jacket is closely fitted to the restrictor,

The nozzle is welded on the outer surface of the base pipe.

The restrictor is a cylindrical pipe body, and the outer surface is provided with threads, and the bottoms of the threads form the flow channel of the restrictor.

The nozzle is provided with several through-hole channels evenly distributed around its circumference.

The support sleeve is provided with several through-hole flow channels evenly distributed in the circumferential direction.

The upper part of the inner surface of the jacket is provided with a 120° stepped surface.

Advantages of the present invention:

The open-hole horizontal well flow regulating and water control device and the balanced oil production process pipe string of the present invention can reduce the flow velocity of the formation fluid, balance the liquid production profile, prevent or limit the flow of non-oil fluid, reduce the water content of the liquid in the pipe, and promote the balance of the entire horizontal section Produce oil, eliminate dead zones, increase oil production and recovery, integrate sand control, oil stabilization, water control, and production increase, easy to operate, economical and practical.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a partially enlarged schematic diagram I of the flow regulation and water control device of the present invention.

Fig. 3 is a partially enlarged schematic diagram II of the flow regulation and water control device of the present invention.

Fig. 4 is a schematic diagram of a throttle inside the flow regulation and water control device of the present invention.

Fig. 5 is a schematic diagram of the pipe string of the balanced oil recovery process of the present invention.

Detailed ways

The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-5, the open-hole horizontal well flow regulation and water control device and the balanced oil recovery process string of the present invention are characterized in that they include a base pipe 2, a screen collar 1 threadedly connected to the upper end of the base pipe 2, and The lower joint 12 connected to the lower end of the base pipe 2, the support sleeve 9 sleeved in the middle of the base pipe 2, the throttle 5 sleeved on the upper outer surface of the base pipe 2, and the throttle 5 The nozzle 6 whose lower end abuts against each other is located between the nozzle 6 and the support sleeve 9, and the limit sleeve 8 fixed on the outer surface of the base pipe 2 is arranged on the restrictor 5, the nozzle 6 and the limiter. The overcoat 3 on the outer surface of the position cover 8 is arranged on several shutoff balls 7 in the chamber 32 formed by the nozzle 6, the overcoat 3, the spacer sleeve 8 and the base pipe 2, and the density of the shutoff ball 7 is the same as The density of the formation water is approximately equal, several liquid outlet holes 4 arranged above the restrictor 5 and located on the upper surface of the base pipe 2, the composite screen assembly 10 sleeved on the lower part of the base pipe 2, and The fixed end ring 11 threadedly connected to the lower part of the base pipe 2,

The outermost upper end of the composite screen assembly 10 is welded to the support sleeve 9, and the outermost lower end of the composite screen assembly 10 is welded to the fixed end ring 11,

The upper end of the jacket 3 is welded to the upper part of the base pipe 2, and the lower end of the jacket 3 is welded to the support sleeve 9, and the jacket 3 is closely attached to the restrictor 5, The upper part of the inner surface of the jacket 3 is provided with a 120° stepped surface, which closely fits and limits the upper end of the restrictor 5 during assembly.

The nozzle 6 is welded on the outer surface of the base pipe 2 .

The restrictor 5 is a columnar pipe body, and the outer surface is provided with threads, and the bottoms of the threads form a flow channel 33 of the restrictor.

The nozzle 6 is uniformly arranged with several through-hole flow channels in the circumferential direction.

The support sleeve 9 is uniformly arranged with several through-hole flow channels in the circumferential direction.

Example

In the following, an open-hole horizontal well flow regulation and water control device and a balanced oil recovery process string of the present invention will be described in detail in combination with the embodiments and the accompanying drawings.

As shown in Fig. 5, the liner string 43 composed of the flow regulation and water control device 46, the oil-expandable packer 45 and the conventional screen 47 is lowered into the wellbore 44, and after the lowering is completed, the hanger 42 is set On the upper casing 41, the flow regulation and water control device 46 is located at the heel of the horizontal section. During oil recovery, the oil-swellable packer 45 swells with oil to realize segmentation of the horizontal well, forming two independent production units.

The fluid 21 from the formation 44 is filtered by the composite screen assembly 10, and enters the chamber 32 through the support ring channel 31. When the density of the fluid 21 is lower than that of the plugging ball 7, the plugging ball 7 will settle into the chamber In the middle and lower part of the chamber 32 (as shown in Figure 2), the fluid 21 enters the throttle channel 33 of the throttle 5 through the upper channel of the nozzle 6, and the spiral throttle channel 33 restricts the fluid 21. Finally, the fluid 21 enters the base pipe 2 from the outlet hole 4 . As the proportion of formation water in the fluid 21 increases, the density of the fluid 21 is close to that of the plugging ball 7, and the plugging ball 7 is gradually suspended in the fluid 21 in the entire chamber 32 (as shown in Fig. 3 ). The flow of the fluid 21, the plugging ball 7 is close to the nozzle 6, the inlet of the nozzle 6 is blocked, the fluid 21 is restricted from passing through the nozzle 6, the production of formation water is eliminated or minimized, and the liquid production profile in the horizontal section is reasonably allocated to maximize the utilization Horizontal section control reserves.

The open-hole horizontal well flow regulating and water control device and the balanced oil production process pipe string of the present invention can reduce the flow velocity of the formation fluid, balance the liquid production profile, prevent or limit the flow of non-oil fluid, reduce the water content of the liquid in the pipe, and promote the balance of the entire horizontal section Produce oil, eliminate dead zones, increase oil production and recovery, integrate sand control, oil stabilization, water control, and production increase, easy to operate, economical and practical.

Claims (5)

1. a kind of open-hole horizontal well tune flow control water installations and balanced oil extraction process tubular column, it is characterised in that including base tube, with this base The screen casing box cupling of pipe threaded upper ends connection, the lower contact being connected with the base tube lower end, the branch being socketed in the middle part of the base tube Support set is socketed in the flow controller of the base tube outer surface of upper, the nozzle being mutually abutted against with this flow controller lower end, be located at this nozzle with Between the support sleeve and it is fixed on the limit sleeve of the base tube outer surface, the flow controller, nozzle and limit sleeve are set Several ball sealers in the chamber being made of the nozzle, housing, limit sleeve and base tube are arranged in the housing of outer surface, setting Several fluid holes above the flow controller and positioned at the base tube upper face, are socketed in the composite screen of the base tube lower part Screen component, the fixation end ring being connect with the base tube lower thread,

The outermost layer upper end of the composite screen mesh component mutually welded with the support sleeve and the composite screen mesh component most Outer layer lower end is mutually welded with the fixation end ring,

The outer set upper side and the top of the base tube are mutually welded and the housing lower end is mutually welded with the support sleeve, The housing is fitted closely with the flow controller,

The nozzle is welded on the base tube outer surface.

2. open-hole horizontal well tune flow control water installations according to claim 1 and balanced oil extraction process tubular column, it is characterised in that The flow controller is column tube body, and outer surface is equipped with screw thread, this Bottom of Thread forms flow controller runner.

3. open-hole horizontal well tune flow control water installations according to claim 1 and balanced oil extraction process tubular column, it is characterised in that The nozzle has circumferentially been uniformly arranged several through-hole runners.

4. open-hole horizontal well tune flow control water installations according to claim 1 and balanced oil extraction process tubular column, it is characterised in that The support sleeve has circumferentially been uniformly arranged several through-hole runners.

5. open-hole horizontal well tune flow control water installations according to claim 1 and balanced oil extraction process tubular column, it is characterised in that The housing inner surface top is provided with 120 ° of step surfaces.