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Carbonate rock acid fracturing simulation sample and preparation method, simulation device and method

A technology of acid fracturing and carbonate rock, which is applied in the direction of earthwork drilling, wellbore/well components, etc., and can solve the problems of being unable to grasp and evaluate the effect of acid fracturing

Active Publication Date: 2018-10-23
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are very few studies on the fracture propagation form of shell limestone reservoirs after acid fracturing, and it is impossible to grasp and evaluate the effect of acid fracturing, which brings challenges to the design of on-site construction technology

Method used

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  • Carbonate rock acid fracturing simulation sample and preparation method, simulation device and method
  • Carbonate rock acid fracturing simulation sample and preparation method, simulation device and method
  • Carbonate rock acid fracturing simulation sample and preparation method, simulation device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0081] See attached figure 1 , The simulated sample of carbonate rock acidizing fracturing provided by Embodiment 1 of the present invention includes a body 1 , an interlayer 2 , a casing 3 , annulus sealing material 4 , and soluble salt water 7 . The body 1 is provided with a first blind hole 5; the body 1 is also provided with several second blind holes 6, and the starting point of several second blind holes 6 is on the inner wall of the first blind hole 5; In several second blind holes 6; the interlayer 2 is blocked above the starting point of several second blind holes 6; one end of the sleeve 3 extends into the first blind hole 5, and one end of the sleeve 3 contacts the interlayer 2. The outer diameter of the bushing 3 < the diameter of the first blind hole 5, so that there is an annular space between the bushing 3 and the wall of the first blind hole 5, and the other end of the bushing 3 is processed with a female part of the detachable connector. end (in this embodime...

Embodiment 3

[0099] The carbonate rock acidizing fracturing simulation device provided in Embodiment 3 of the present invention includes the carbonate rock acidizing fracturing simulation sample provided by the present invention, a true triaxial loading chamber, a first hose, an acid pressure pumping system, a servo Control System. One end of the first hose is provided with a sub-end for detachably connecting with the female end; the carbonate rock acidification fracturing simulation sample is accommodated in the true triaxial loading chamber; the female end is detachably connected to the sub-end; The other end of a hose is fixedly connected to the acid pressure pumping system; the servo control system is used to control the action of the acid pressure pumping system.

[0100] Wherein, the detachable connecting piece is a thread, and the sub-end is processed with an internal thread or an external thread. In this embodiment, it is an external thread 8 .

[0101] Wherein, the detachable co...

Embodiment 4

[0104] See attached image 3 The simulation method for acid fracturing of carbonate rocks provided in Embodiment 4 of the present invention is realized based on the simulation device for acid fracturing of carbonate rocks provided by the present invention. The simulation method includes the following steps:

[0105] Step 1: Start the testing machine in the true triaxial loading chamber, and apply the simulated formation three-dimensional stress to the simulated sample of carbonate rock acid fracturing;

[0106] Step 2: Start the servo control system, so that the acid liquid is pumped into the casing 3 through the acid pressure pumping system;

[0107] Step 3: As the pressure of the acid fluid pumped into the casing 3 increases, the simulation sample of carbonate rock acid fracturing ruptures to produce acid fracturing fractures, and at the same time, the pump pressure curve of the acid fracturing pump system drops;

[0108] Step 4: Testing machine for brake servo control system...

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Abstract

The invention discloses a carbonate acidizing and fracturing simulation sample, a preparation method, a simulation device and a method. The sample comprises a body, a partition layer, a sleeve, an annulus plugging material and a dissoluble saline solution. A first blind hole is formed in the body. A plurality of second blind holes are formed in the body. The start points of the second blind holes are located on the inner wall of the first blind hole. The second blind holes are filled with the dissoluble saline solution. The partition layer is blocked above the start points of the second blind holes. One end of the sleeve extends into the first blind hole, and the other end of the sleeve makes contact with the partition layer. The outer diameter of the sleeve is smaller than the diameter of the first blind hole so that an annulus can be formed between the sleeve and the wall of the first blind hole. The female end of a detachable connection piece is machined at the other end of the sleeve. The annulus is filled with the annulus plugging material. The sample can be prepared through the preparation method. The simulation device and the method are obtained on the basis of the sample. Understanding of the three-dimensional space distribution form of carbonate tight reservoir acidizing and fracturing seams is helped, and important significance in refitting of carbonate tight reservoirs is achieved.

Description

technical field [0001] The invention relates to the technical field of carbonate rock acidizing fracturing simulation tests, in particular to a carbonate rock acidizing fracturing simulation sample, a preparation method, a simulation device and a method. Background technique [0002] Carbonate rock refers to the general term for rocks composed of carbonate minerals formed by sedimentation, mainly limestone and dolomite. Carbonate rocks and carbonate sediments have been produced from the Precambrian to the present, and are widely distributed, accounting for about 1 / 5 to 1 / 4 of the total sedimentary rocks. Carbonate rock itself is also a useful mineral, such as limestone, dolomite, siderite, rhodochrosite, magnesite, etc., which are widely used in metallurgy, construction, decoration, chemical and other industries. Carbonate rocks are rich in oil, natural gas and groundwater. Carbonate oil and gas fields in the world account for 50% of the total reserves and 60% of the total...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 郭印同杨春和曾义金王磊徐峰
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI