Unlock instant, AI-driven research and patent intelligence for your innovation.

Shale micro-nano-scale pore simulation plugging evaluation device and method

A simulation method and evaluation device technology, which can be used in teaching models, earthwork drilling, sealing/sealing, etc., and can solve problems such as weak sealing ability.

Inactive Publication Date: 2021-02-02
BC P INC CHINA NAT PETROLEUM CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the problem that the existing methods in the background technology cannot effectively simulate the micro-nano pore structure, which leads to the weak plugging ability of the drilling fluid to the micro-nano pore, and provides a shale micro-nano pore simulation sealing Blocking evaluation device

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
  • Shale micro-nano-scale pore simulation plugging evaluation device and method
  • Shale micro-nano-scale pore simulation plugging evaluation device and method
  • Shale micro-nano-scale pore simulation plugging evaluation device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Three kinds of stainless steel powder sheets with pore diameters of 50nm, 200nm, and 100μm were selected, and three parts of base slurry liquid to be tested (4% bentonite slurry + 3% sulfonated asphalt plugging agent) were prepared, and the micro-nano To evaluate the plugging effect of grade cracks: connect the valve stem to the upper lid of the mud cup and fix it on the top of the mud cup; then invert the mud cup and pour the liquid to be tested into the mud cup to the scale line on the inner wall; then place 50nm stainless steel powder Cover the upper and lower cup lids, connect the valve stem and tighten; then turn the mud cup upside down so that the end with the stainless steel powder sheet faces down and put it into the heating jacket; then connect the air source to the upper and lower valve stems of the mud cup, and put the heating jacket The temperature is set at the bottom hole temperature of 120°C and the pressure difference is 3.5 MPa, and the plugging performa...

Embodiment 2

[0029] A stainless steel powder sheet with a pore diameter of 200nm was selected, and the sulfonated asphalt plugging agent and the micro-nano polymer plugging material NP-1 (the particle size distribution range was between 10nm and 200μm) were mixed according to the ratio of 1:1, 2:1, and 3 :1, 4:1 in different ratios to form a plugging material, add this plugging material to 4% bentonite slurry in an amount of 1%~4% to prepare the slurry to be tested, and conduct a high temperature test at 120°C High pressure filtration test. The specific operation steps are: connect the valve stem with the upper cover of the mud cup, and fix it on the top of the mud cup; then invert the mud cup, pour the liquid to be tested into the mud cup to the scale line on the inner wall; then place 200nm stainless steel powder flakes; cover up and down Cup cover, connect the valve stem and tighten; then turn the mud cup upside down so that the end with the stainless steel powder sheet faces down and p...

Embodiment 3

[0032] Three kinds of stainless steel powder sheets with pore diameters of 50nm, 200nm and 100μm were selected, and the same slurry to be tested as in Example 2 was configured, and the plugging experiment was carried out by using the device of the present invention. like image 3 As shown, the fluid loss of the three kinds of pore size flakes are all low. After the total addition amount reaches 2%, the change of fluid loss has become stable, which is consistent with the experimental results of micron filter paper. The blocking effect has been significantly improved.

[0033] The micro-nano plugging material used in the examples is the micro-nano polymer plugging material NP-1, the particle size distribution range is between 10nm and 200 μm, produced by Shandong Deshunyuan Petroleum Technology Co., Ltd.; the stainless steel powder sheet was purchased from Kunshan Fang Bean Electronic Technology Co., Ltd.

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

PropertyMeasurementUnit
Apertureaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a shale micro-nano-scale pore simulation plugging evaluation device and method, and solves the problem that the prior method cannot be used for effectively simulating a micro-nano-scale pore structure, so that the plugging capability of drilling fluid to a porous stratum is relatively weak. The shale micro-nano-scale pore simulation plugging evaluation device is characterized in that a valve rod at the top of a slurry cup is connected with an air source through a high-pressure pipeline, and a valve rod at the bottom of slurry is connected with a condensation receiving device through a high-pressure pipeline; and liquid to be measured is contained in the slurry cup, a stainless steel powder sheet is arranged at the bottom of the liquid to be measured, and the stainless steel powder sheet is similar to the internal characteristics of a shale stratum pore structure. The simulation method comprises the following steps of (1) selecting the stainless steel powder sheet with a required aperture range; (2) preparing the liquid to be measured; and (3) evaluating the plugging effect of micro-nano cracks by using a plugging device. The shale micro-nano-scale pore simulation method and evaluation device can be used for a plugging agent optimization experiment and a drilling fluid plugging capacity evaluation experiment, and a reliable evaluation test method is provided.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploration in oil fields, in particular to a device and method for simulating plugging and evaluation of micro-nano-scale pores in mud shale. Background technique [0002] Wellbore instability in shale formations is a worldwide problem that can never be avoided during drilling. It causes huge losses to the world oil industry every year. This is mainly because the shale not only contains many micro-scale micro-cracks, but also has a large number of micro-nano-scale pore structures. As a result, when shale is in contact with foreign fluids such as drilling fluid, not only the micro-fractures will undergo “hydraulic sharpening” under the action of external force, which will increase the width of the fractures and cause the wellbore to become unstable; the foreign liquid phase will also Under the capillary force of the pore structure, it enters the deep formation from the area ne...

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
IPC IPC(8): E21B33/13E21B33/138E21B47/00E21B47/06E21B47/07G09B25/04
CPCE21B33/13E21B33/138E21B47/00E21B47/06G09B25/04
Inventor 侯杰刘永贵杨决算于兴东初成张冬明刘振华宋涛
Owner BC P INC CHINA NAT PETROLEUM CORP