Oil deposit purification sewage sand-carrying filling sand prevention method and sand prevention pipe column

A technology for sand control pipes and sewage, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of affecting the permeability of oil reservoirs, easy to block sand filter pipes, and production decline, etc., so as to ensure filling and sanding. The success rate of construction, the effect of ensuring smooth sand addition and preventing process settlement

Active Publication Date: 2019-01-18
CHINA PETROLEUM & CHEM CORP +1
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Hanging filter sand control: Due to the small gap (0.07mm) of the metal felt in the sand filter tube, heavy oil and muddy components are easy to block the filter sand tube after sand control, resulting in a decrease in the seepage capacity of the filter sand tube and a large drop in oil well production
[0005] 2. Conventional extrusion filling sand control: multiple fracturing trucks (including fracturing trucks, sand mixing trucks, instrument trucks, etc.) and special sand-carrying fluid are required, and the cost of the two items is about 200,000 yuan; and special sand-carrying equipment is also required Medium and high viscosity sand-carrying fluid (viscosity 40-60mPa·s, 60-80mPa·s) prepared by liquid tank and various chemical materials, plus sand control and operation costs, the average sand control cost of a single well is 446,000 yuan, and the cost of measures is high. Poor economic benefits
[0006] 3. Chemical sand control: chemical agent formula is used, affected by the extrusion conditions and construction parameters during extrusion, the muddy fine silt sand cannot be properly discharged after sand control, which affects the permeability of the reservoir. After sand control, it is easy to cause production decline, and the validity period is relatively mechanical Filling and sand control has a short validity period

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Oil deposit purification sewage sand-carrying filling sand prevention method and sand prevention pipe column
  • Oil deposit purification sewage sand-carrying filling sand prevention method and sand prevention pipe column
  • Oil deposit purification sewage sand-carrying filling sand prevention method and sand prevention pipe column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The sand control string of this embodiment, such as figure 1 As shown, it includes a top packer 2, a top sand control tool assembly, a sand control screen 7, a bottom sand control tool assembly and a plug 11. The upper part of the top packer 2 is connected to the oil filling pipe 1; the plug 11 is connected to the The artificial sand surface 12 keeps a certain distance;

[0039] The top packer 2, the top sand control tool assembly, the sand control screen 7, the bottom sand control tool assembly, and the plug 11 are sequentially connected from top to bottom through the tubing sub-joint 13 to form an outer tubing string, and the outer tubing string is connected to the casing An outer annular space 17 for filling sand control is formed between the pipes 15, wherein the sand control screen 7 is located at the corresponding position of the sand control layer 19; the top sand control tool assembly includes the top signal screen 5 and sand control The compensator 6; the bott...

Embodiment 2

[0044] In this embodiment, the sand control method for oil reservoir purification sewage filling with sand, adopts the sand control pipe string as described in Embodiment 1, and specifically includes the following steps:

[0045] 1) The sand surface is scoured, so that the artificial sand surface is 10±0.5m below the lower boundary of the oil layer, so as to meet the needs of sand control strings and sand settlement;

[0046] 2) Open the well, check the technical condition of the casing, and ensure the normal construction and production;

[0047] 3) Scrape the casing to ensure that the upper and lower casing inner walls at the top packer setting position are clean;

[0048] 4) The pressure test of the pipe string is qualified to ensure that there is no leakage when the pipe string is filled;

[0049] 5) According to the design requirements, the sand control string with the top packer described in Embodiment 1 is lowered into the predetermined position in the well, so that the...

Embodiment 3

[0058] In this embodiment, the sand control method for oil reservoir purification sewage filling with sand, adopts the sand control pipe string as described in Embodiment 1, and specifically includes the following steps:

[0059] 1) The sand surface is scoured, so that the artificial sand surface is 10±0.5m below the lower boundary of the oil layer, so as to meet the needs of sand control strings and sand settlement;

[0060] 2) Open the well, check the technical condition of the casing, and ensure the normal construction and production;

[0061] 3) Scrape the casing to ensure that the upper and lower casing inner walls at the top packer setting position are clean;

[0062] 4) The pressure test of the pipe string is qualified to ensure that there is no leakage when the pipe string is filled;

[0063] 5) According to the design requirements, the sand control string with the top packer described in Embodiment 1 is lowered into the predetermined position in the well, so that the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an oil deposit purification sewage sand-carrying filling sand prevention method and a sand prevention pipe column. The method comprises the following steps of 1, putting the sand prevention pipe column provided with a top packer in a predetermined position in a well, conducting packing, and opening a filling sand adding channel; 2, with oil deposit purification sewage withthe viscosity of 1.4-1.6 mPa.s as sand-carrying liquid, mixing the oil deposit purification sewage with quartz sand with the particle size of 0.4-0.8 mm according to the sand-carrying ratio of 3-15%,and afterwards, conducting positive squeezing and filling; 3, conducting releasing, and backwashing remaining sand in a pipe. According to the method, the oil deposit purification sewage with low viscosity serves as the sand-carrying liquid, the risks of sand blocking and sand burying are reduced, successful sand adding is ensured, and the construction requirement for low-sand-ration filling sandprevention is met. The sand-carrying liquid is the purified thickened oil sewage of an area where a construction well is located, has good compatibility with stratum liquid and stratum minerals, avoids the situation that chemical reactions are caused and sediments clog stratum pores, and is wide in source, cheap and low in cost.

Description

technical field [0001] The invention belongs to the technical field of sand control of oil production machinery in oil fields, and in particular relates to a sand control method and a sand control pipe string for oil reservoir purification sewage to carry sand and fill. Background technique [0002] Due to shallow burial depth, poor diagenesis, loose cementation, low cementation strength, high viscosity of heavy oil, strong sand-carrying ability, production pressure difference during steam huff and puff production and oil recovery Excessive size and other reasons lead to serious sand production in oil wells. The sand production of oil wells has a serious impact on the production rate of heavy oil, making the oil well unable to produce normally, directly affecting the productivity of the oil well and the output of the oil field, increasing the workload of ground maintenance and downhole operations, and increasing the production cost. [0003] The content of fine silt in the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/08E21B37/00
CPCE21B37/00E21B43/086
Inventor 忽朝义彭元东李古正靳水生方舒王若浩王端哲徐子彬张兴可刘志强宋江涛忽顺德
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap