CN202152670U - Horizontal Well Sectional Measures Construction String - Google Patents

Abstract

A horizontal well subsection measure construction pipe column is applied to oil and gas underground construction. The upper end of the guide shoe is connected with a check valve and a seat sealing ball seat, and the upper end of the seat sealing ball seat is connected with 3-10 sliding sleeve packer groups; the upper end of the sliding sleeve packer group is connected with a connecting oil pipe and a suspension packer, the upper end of the suspension packer is connected with a sealing insertion pipe, a centralizer, a hydraulic anchor and an oil pipe, and the oil pipe extends to a well head; the sliding sleeve packer group is characterized in that two ends of the expansion packer are respectively connected with a centralizer, and the other end of the centralizer is connected with a pitching sliding sleeve. The effect is as follows: and the multi-well section of the horizontal well can be reformed by adopting a multi-stage sliding sleeve. The joint effect on the well wall, particularly the open hole well wall, is good, and is suitable for sections of horizontal wells and open hole well completions; when can effectively avoid the tubular column to descend, the packer that arouses because of the water effect in the tubular column sets up the seal midway, and owing to set up one-way inlet means, has increased the reliability of tubular column.

Description

Horizontal Well Sectional Measures Construction String

technical field

The utility model relates to a combination of downhole measure construction pipe strings for petroleum and natural gas production, in particular to an open hole multi-stage segmental measure construction pipe string for horizontal wells and high-inclination wells. the

Background technique

In the process of oil and natural gas exploitation, for some oil and gas wells with low permeability or low natural energy and rapid production decline, after a period of exploitation, it is generally necessary to carry out targeted layering and segmented construction of the reservoir Transformation to enhance the recovery of the reservoir. Transformation measures include acidification, fracturing, water injection, etc. Although the existing downhole segmented construction string technology can realize the segmented operation of vertical wells and horizontal wells completed with casing to a certain extent, it still has the disadvantages of few segments and high operating costs. There are still some difficulties in the construction of horizontal wells with open hole completion, mainly reflected in: due to the irregular well wall, the multi-stage isolation of the horizontal open hole section is difficult; there is no corresponding anchoring mechanism, and the pipe string is easy to creep It is difficult to achieve the segmentation effect due to the failure of the seal of the packer; the wellbore trajectory of the horizontal well is complex, coupled with factors such as the frictional resistance of the pipe string itself, it is difficult to run the construction pipe string into the horizontal section. the

Utility model content

The purpose of this utility model is: to provide a horizontal well segmented construction pipe string, which is suitable for horizontal wells with vertical wells and casing completions, and can also be applied to horizontal wells with open hole completions. Multi-level mechanical segmental isolation is carried out on the well section to meet the needs of various construction techniques such as downhole multi-level acidizing, fracturing, and water injection. the

The technical scheme adopted by the utility model is: the construction string of the horizontal well segmented measures, mainly composed of oil pipe, hydraulic anchor, centralizer, sealing intubation, suspension packer, connecting oil pipe, expansion packer, ball-throwing sleeve, It is composed of a seat seal ball seat, a check valve and a guide shoe, and is characterized in that a check valve is connected to the upper end of the guide shoe, the upper end of the check valve is connected with a seat seal ball seat, and the upper end of the seat seal ball seat is connected with 3 to 10 Sliding sleeve packer group; the upper end of the sliding sleeve packer group is connected to the connecting tubing, the upper end of the connecting tubing is connected to a hanging packer, the upper end of the hanging packer is connected to a sealing cannula, and the upper end of the sealing cannula is connected to a righting device, the upper end of the centralizer is connected with a hydraulic anchor, and the upper end of the hydraulic anchor is connected with an oil pipe, and the oil pipe reaches the wellhead; Two ends of the expandable packer are respectively connected with a centralizer, and the other end of the centralizer is connected with a ball-pitching sleeve, and the other end of the ball-pitching sleeve is connected with the centralizer of the next sleeve packer group. the

What described pitching sliding sleeve adopts is constant pressure sliding sleeve or drillable type pitching sliding sleeve. the

The beneficial effect of the utility model is that: the segmented construction pipe string of the horizontal well adopts the multi-stage sliding sleeve to realize the multi-section reconstruction of the horizontal well. The expandable packer 7 has a long sealing surface, high pressure bearing index, good adhesion to the well wall, especially the open hole wall, and is suitable for horizontal wells and open hole completion well sections; it can effectively avoid the The packer is set halfway due to the hydraulic action in the pipe string, and the reliability of the pipe string is increased due to the installation of a one-way liquid inlet device. the

Description of drawings

Fig. 1 is a schematic diagram of the structure of the utility model horizontal well segmented construction pipe string. the

Fig. 2 is a schematic diagram of the structure of the utility model horizontal well segmented construction pipe string before it is lowered into the well and sealed. the

In the figure, 1-oil pipe, 2-hydraulic anchor, 3-stabilizer, 4-sealing cannula, 5-hanging packer, 6-connecting oil pipe, 7-expandable packer, 8-balling sleeve, 9 -sealing ball seat, 10-check valve, 11-lead shoe, 12-setting oil pipe. the

Detailed ways

Embodiment 1: take a horizontal well segmental measures construction string as an example, the utility model is described in further detail. the

See Figure 1. The construction string of the horizontal well in the utility model is mainly composed of a tubing 1, a hydraulic anchor 2, a centralizer 3, a sealing intubation tube 4, a suspension packer 5, a connecting tubing 6, an expansion packer 7, and a ball-throwing sleeve. 8. It is composed of seat seal ball seat 9, check valve 10 and guide shoe 11. The components used are all available in the market. the

Sectional measures for horizontal well construction pipe string from bottom to top: a check valve 10 is connected to the upper end of the guide shoe 11, the upper end of the check valve 10 is connected to a seat seal ball seat 9, and the upper end of the seat seal ball seat 9 is connected to Five sliding sleeve packers can isolate four formations. The sliding sleeve packer set is composed of an expanding packer 7, a ball-throwing sliding sleeve 8 and two centralizers 3. A centralizer 3 is connected to the two ends of the expanding packer 7 respectively. The other end of the 3 is connected to a drillable ball-throwing sleeve 8, and the other end of the drillable ball-throwing sleeve 8 is connected to the centralizer 3 of the next sleeve packer group. The upper end of the sliding sleeve packer group is connected to the connecting tubing 6, the upper end of the connecting tubing 6 is connected to a hanging packer 5, the upper end of the hanging packer 5 is connected to the sealing cannula 4, and the upper end of the sealing cannula 4 is connected to the righting 3, the upper end of the centralizer 3 is connected with a hydraulic anchor 2, and the upper end of the hydraulic anchor 2 is connected with an oil pipe 1, and the oil pipe 1 reaches the wellhead. the

Briefly describe the working principle of the construction string of the horizontal well segmented measures. See Figure 2. Five sliding sleeve packer groups should be configured according to the oil layer segmentation. First, connect the drop pipe string, which is the general term for the suspension packer 5 to the guide shoe 11 . The setting oil pipe 12 is connected to the upper part of the abandoned pipe string, and the abandoned pipe string is lowered into the well to the designed position by using the set oil pipe 12 . Secondly, put in a small-diameter and low-density sealing ball. When the sealing ball reaches the seating ball seat 9, the pressure in the pipe string rises, and the hanging packer 5 and the expansion packer 7 are set. After the setting is completed, continue Increase the internal pressure of the pipe string and effectively isolate the well section without letting go of the pipe string. See Figure 1. Then, the setting tubing 12 is taken out, and the part above the sealing cannula 4 is lowered, and the sealing cannula 4 is sealed butted with the suspension packer 5 . Increase the internal pressure of the pipe string, and the hydraulic anchor 2 anchors the construction pipe string under the action of the pressure difference between the inside and outside of the construction pipe string, and continues to increase the internal pressure of the pipe string, so that the ball sliding sleeve 8 is opened, and the first stage is carried out. When it is necessary to carry out measure construction work on the second section, a slightly larger diameter low-density sealing ball can be put in, and when the low-density sealing ball reaches the corresponding drillable ball-throwing sleeve 8, the pipe string is raised Internal pressure, open drillable ball throwing sliding sleeve 8, can carry out the measure construction operation of the second section, and so on, just can finish the measure construction operation of the 3rd, 4th, 5th, etc. sections. After the operation is completed, take out the construction pipe string for measures, and lower it into other corresponding pipe strings to carry out production or testing operations. the

Claims (2)

1. A horizontal well segmented construction string mainly consists of oil pipe (1), hydraulic anchor (2), centralizer (3), sealing intubation pipe (4), suspension packer (5), connecting oil pipe ( 6), composed of expandable packer (7), ball sliding sleeve (8), seat seal ball seat (9), check valve (10) and guide shoe (11), characterized in that: guide shoe (11) ) is connected to a check valve (10), the upper end of the check valve (10) is connected to the seat seal ball seat (9), and the upper end of the seat seal ball seat (9) is connected to 3 to 10 sliding sleeve packer groups; The upper end of the sliding sleeve packer group is connected to the connecting tubing (6), the upper end of the connecting tubing (6) is connected to a hanging packer (5), and the upper end of the hanging packer (5) is connected to a sealing cannula (4), A centralizer (3) is connected on the sealing intubation tube (4), the upper end of the centralizer (3) is connected with a hydraulic anchor (2), and the upper end of the hydraulic anchor (2) is connected with an oil pipe (1), and the oil pipe (1) has been to the wellhead; the sliding sleeve packer group is composed of an expanding packer (7), a ball-throwing sliding sleeve (8) and a centralizer (3), and the two ends of the expanding packer (7) are A centralizer (3) is connected, and a pitching sleeve (8) is connected to the other end of the centralizer (3), and the other end of the pitching sleeve (8) is connected to the centralizer (3 )connect. 2. The horizontal well segmented construction pipe string according to claim 1, characterized in that: the ball-throwing sleeve (8) is a constant-pressure sliding sleeve or a drillable ball-throwing sleeve.

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