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A continuous negative pressure sand pumping string with concentric tubing for horizontal wells

A technology for process strings and horizontal wells, which is applied in the direction of flushing wellbore, wellbore/well components, earthwork drilling and production, etc. It can solve the problem of low flowback rate, large amount of liquid entering the ground from medium and low pressure oil, and affect the development effect of horizontal wells and other issues to achieve the effect of improving construction efficiency and ensuring smoothness

Active Publication Date: 2017-08-04
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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  • A continuous negative pressure sand pumping string with concentric tubing for horizontal wells
  • A continuous negative pressure sand pumping string with concentric tubing for horizontal wells
  • A continuous negative pressure sand pumping string with concentric tubing for horizontal wells

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 columnar 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 columnar connector 805. The inside of the blind hole on the right surface is 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] The...

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Abstract

The invention belongs to the technical field of oil field workover under casing completion conditions, and relates to a continuous negative pressure sand pumping process string of concentric oil pipes in horizontal wells. The oil pipe combination, the lower end of the concentric oil pipe combination is connected to the negative pressure sand pump; the steel ball and the ball seat are arranged inside the reversing joint, the steel ball is connected to the spring, the other end of the spring is fixed above the ball seat, and the reversing joint wall below the ball seat There is a discharge hole on the top, and a sliding sleeve is provided on the outer wall of the reversing joint to block the discharge hole. The string can realize negative pressure sand pumping under the premise of meeting the continuous string operation of the horizontal well in the oil field, and has the function of cleaning scale in the casing. , The function of crushing cement. This pipe string integrates the functions of sand removal, scale cleaning, and cement crushing in the wellbore for the first time and realizes the joint operation of the pipe string in one trip, which greatly simplifies the construction process and improves the 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 Patents(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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