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Horizontal well concentric tubing continuous negative pressure sand pump process tubular column

A technology for process strings and horizontal wells, which is applied in wellbore flushing, wellbore/well components, earthwork drilling and production, etc. It can solve the problems of low flowback rate, large amount of fluid entering the ground for medium and low pressure oil, and long time consumption. Achieve the effect of improving construction efficiency and ensuring smoothness

Active Publication Date: 2015-11-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the various problems that the "conventional pen tip + tool tubing" string cannot adapt to the existing horizontal well sand flushing process, which will lead to long time consumption, high cost and large amount of liquid entering the ground in medium and low pressure reservoirs , low flowback rate, etc., and at the same time cause a certain degree of damage to the formation, which affects the development effect of horizontal wells

Method used

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  • Horizontal well concentric tubing continuous negative pressure sand pump process tubular column
  • Horizontal well concentric tubing continuous negative pressure sand pump process tubular column
  • Horizontal well concentric tubing continuous negative pressure sand pump process tubular column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a horizontal well concentric tubing continuous negative pressure sand pumping process string, such as figure 1 or figure 2 As shown, it includes a high-pressure faucet 1, a reversing joint 2, a tool oil pipe 3, a concentric oil pipe combination 9 and a negative pressure sand extractor 8. The high-pressure faucet 1 is connected to the tool oil pipe 3 through the reversing joint 2, and the lower end of the tool oil pipe 3 passes through the conversion joint 4 Connect the concentric oil pipe assembly 9, the lower end of the concentric oil pipe assembly 9 is connected to the negative pressure sand extractor 8; the reversing joint 2 is provided with a steel ball 201 and a ball seat 202 inside, the steel ball 201 is connected to the spring 203, and the other end of the spring 203 is fixed At the position above the ball seat 202 , a discharge hole 204 is opened on the wall of the reversing joint 2 below the ball seat 202 , and a sliding sleeve 205 for...

Embodiment 2

[0032] In this embodiment, the concentric tubing assembly 9 is specifically described, which completely changes the sand removal process of the horizontal well, and adopts the process string based on the concentric tubing assembly 9 instead of the process string based on the tool tubing. The concentric tubing assembly 9 includes an outer tool tubing 10 and a built-in tubing 7 located inside the outer tool tubing 10 and concentric with it. The outer tool tubing 10 and the built-in tubing 7 are kept in a concentric state through the concentric tubing collar 6. The lower end of the tool tubing 3 passes through The conversion joint 4 is connected with the built-in oil pipe 7, and a sealing cup 5 is installed on the outer wall of the outer tool oil pipe 10.

[0033] Under the action of the sealing cup 5, the circulating liquid directly enters the annulus between the outer tool oil pipe 10 and the built-in oil pipe 7 after passing through the conversion joint 4, and then enters the n...

Embodiment 3

[0035] On the basis of Example 1 and Example 2, as image 3 As shown, the negative pressure sand extractor 8 in this embodiment is composed of a throat pipe 801, an outer cylinder 802, a central pipe 803, a conical nozzle 804, a connecting head 805, and a baffle head 806;

[0036] The connector 805 is a horizontal cylindrical structure, and its left and right surfaces are drilled with blind holes. The inner part of the blind hole on the left surface is provided with a liquid guide hole 11 along the radial direction of the cylindrical connector 805. The inside of the blind hole on the right surface Along the radial direction of the cylindrical connecting head 805, there are a plurality of sand pumping channels 13, and these sand pumping channels 13 are evenly distributed in the circumferential direction of the connecting head 805, and the axial direction of the connecting head 805 is provided with a pumping channel that penetrates the connecting head 805. Sand hole 12;

[0037] ...

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Abstract

The invention belongs to the technical field of oilfield workover in the conditions of perforated casing completion, and discloses a horizontal well concentric tubing continuous negative pressure sand pump process tubular column, wherein a high pressure water faucet is connected with a tool tubing through a reversing joint, the lower end of the tool tubing is connected with a concentric tubing combination through a conversion joint, the lower end of the concentric tubing combination is connected with a negative pressure sand pump device, a steel ball and a ball seat are arranged in the reversing joint, the steel ball is connected with a spring, the other end of the spring is fixed on an upper position of the ball seat, a discharge hole is arranged on the wall of the reversing joint which is arranged below the ball seat, and a sliding sleeve which blocks the discharge hole is arranged on the outer wall of the reversing joint. The horizontal well concentric tubing continuous negative pressure sand pump process tubular column achieves negative pressure sand pumping under the premise that the demands of oilfield horizontal well continuous tubular column downward operation are met, simultaneously has the functions that scales are cleaned up and cements are crushed in a sleeving. The horizontal well concentric tubing continuous negative pressure sand pump process tubular column integrates the functions of sand removal, scale clean and cement crushing in a shaft firstly and achieves once integration operation, greatly simplifies construction procedure, and improves construction efficiency.

Description

technical field [0001] The invention belongs to the technical field of oil field workover under casing completion conditions, and in particular relates to a continuous negative pressure sand pumping process string of concentric oil pipes in horizontal wells. Background technique [0002] With the continuous improvement of horizontal well development technology, the length of horizontal section, the number of stimulated sections and the scale of fracturing are increasing year by year. In large-scale applications, problems such as short sand penetration period, large sand production volume, and serious leakage in the wellbore of horizontal wells are becoming more and more serious, which affects the effective use of production capacity and the smooth implementation of subsequent measures. It is necessary to carry out sand washing and well washing operations in time to ensure the smoothness of the wellbore. [0003] At present, the "conventional pen tip + tool tubing" sand washi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00
Inventor 刘江波慕立俊桂捷王尚卫张雄涛白小佩张安康王昌龄刘明
Owner PETROCHINA CO LTD
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