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Accurate sand-filling layered optimization design method for continuous oil pipe

A technology of optimized design and sand filling, applied in earth-moving drilling, wellbore/well components, production fluid, etc., can solve the problems of low efficiency of one-time sand filling, time-consuming and laborious sand filling, etc., and achieve the effect of avoiding sand filling failure.

Active Publication Date: 2015-04-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves the time-consuming and labor-intensive sand filling process of the existing coiled tubing sand filling process, and the low efficiency of one-time sand filling, saves construction time, and lays the foundation for efficient fracturing and popularization of coiled tubing to a certain extent.

Method used

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  • Accurate sand-filling layered optimization design method for continuous oil pipe
  • Accurate sand-filling layered optimization design method for continuous oil pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The coiled tubing precise sand packing layer optimization design method includes the following steps:

[0037] Step 1. Determination of the position of the sand filling surface

[0038] When the perforation interval is large, the designed sand surface position is 20 meters above the constructed interval; when the perforation interval is small, it is necessary to ensure a 5-meter pocket below the lower boundary of the upper perforation interval;

[0039] Step 2, calculate the amount of sand filling support

[0040] 1) Calculate the casing internal volume / m;

[0041] 2) The amount of sand filling after the construction of the first layer is: the casing volume occupied by the artificial well bottom to the designed sand surface;

[0042] 3) The amount of sand plug for other interlayer isolation is: the casing volume occupied by the sand surface of the previous layer to the designed sand surface;

[0043] Step 3, the sand filling concentration is designed to be 15-20%; ...

Embodiment 2

[0061] In May 2012, a new technology test of coiled tubing sand packing layered fracturing was carried out on SD3-69xx well, a development well in Sulige Gas Field. Before construction, the precise sand packing optimization design method was adopted, that is, the displacement pump was lowered before sand filling injection. Inject 2-3 square meters of clear water spacer fluid, and through under-displacement, the sand-fill proppant is rapidly deposited in the spacer fluid to form a sand plug to achieve interlayer separation. The field test of sand filling and delamination was successful at one time.

[0062] Such as figure 1 As shown, the well is constructed with three layers and two layers of sand filling and layering. After the main fracturing construction under the mountain 2 is completed, the under-replacement sand filling layer is under the mountain 2 and up the mountain 2; Layered mountain 2, box 8 floors.

[0063] The present invention is illustrated by the precise sand...

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Abstract

The invention relates to an accurate sand-filling layered optimization design method for a continuous oil pipe. A method for effectively settling a sand-filling supporting agent in spacer fluid to form a sand compartment through under-displacement is mainly matched with a method for extruding the sand detection surface of the sand compartment through the continuous oil pipe, and the effectiveness of one-step sand filling is realized and is accurately judged. The accurate sand-filling layered optimization design method comprises the following steps of: accurately metering the amount of the sand-filling supporting agent, injecting 2-3 cubes of spacer fluid in front of the sand compartment before the displacement stage, settling the sand-filling supporting agent in the spacer fluid for four hours to form the sand compartment through under-displacement; and finally, determining the effective pack-off capability of the sand compartment by matching with the sand detection surface of the sand compartment. Therefore, the aim of successfully sand filling and layering at a time is fulfilled, and a foundation is laid for popularization and application of layering transformation of the continuous oil pipe through sand-filling layering.

Description

technical field [0001] The invention relates to a method for realizing interlayer isolation by sand-filling layers in the field of oil and gas field exploration and development, and is particularly suitable for a coiled tubing accurate sand-filling layering optimization design method for slimhole vertical well multi-layer fracturing reconstruction. Background technique [0002] The coiled tubing hydrojet sand pack layered fracturing technology forms sand plugs through under-displacement after fracturing to achieve interlayer isolation. The effectiveness of its isolation is mainly affected by the accurate calculation of the sand plug volume and the effective retention and settlement in the wellbore. [0003] Through investigation, there are two methods for the formation of sand plugs in the coiled tubing sand-packing fracturing process. One is the original sand filling method, which is replaced in place after the main fracturing operation, and the interlayer isolation is ach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B33/12
Inventor 郭艳萍韩文哲陈松宋孝丹樊启国杨红斌高红平夏玉磊李杉杉陈雄
Owner BC P INC CHINA NAT PETROLEUM CORP