Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration

A technology of drilling fluid density and concentration, which is applied in drilling compositions, chemical instruments and methods, and earthwork drilling and production, and can solve the problems of difficult-to-control salt layer creep, limited formation pressure bearing capacity, and easy lost circulation, etc. question

Inactive Publication Date: 2006-08-09
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0002] At present, in the process of oil drilling, the salt layer encountered is deeply buried, thick and discontinuous, and high-density drilling fluid is required to control the c...

Method used

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  • Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration
  • Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration
  • Method for overcomming creep of salt-rock layer by using ralation of drilling fluid density and chloride concentration

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] In the present invention, the method for overcoming the creep of the salt formation by utilizing the relationship between the drilling fluid density and the concentration of chloride radicals mainly includes the following steps:

[0038] 1. For a certain structural depth of salt rock layer that is H meters, the wax-sealed salt rock core obtained by drilling and coring is carried out for experimental sample processing. The size specification of the sample is that the length is 50mm, and the diameter is a cylinder of 25mm. The quantity is 8 (other quantities are also possible), and they are respectively numbered 1, 2, ..., 7, 8;

[0039] 2. Take 4 samples (numbered 1, 2, 3, 4), and carry out a creep test on a rock creep testing machine for each sample, adopt the experimental method of multi-stage temperature and multi-stage lo...

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Abstract

Present invention refers to a method for overcoming salt rock layer creepage utilizing drilling fluid density and chlorides concentration relationship concentration relationship. It contains 1, to make hole boring with sampling and test sample processing, 2, taking four experiment test samples, to proceed creep test to each test sample, taking multiple level temperature and multiple level loading compound experiment mode to obtain creep test straining and timetable, 3, establishing salt rock creepage constitutive relation equation i.e. creep stress-rate of strain relation equation through curve matching method, 4, establishing well bore necked-in rate and drilling fluid density relation equation,5, taking the rest of four test samples, to proceed salting in experiment, corresponded salting in dissolution rate and chlorides pH indicator relation curve, establishing salting in rate and chlorides pH indicator relational model through nonlinear regression, 6, establishing drilling fluid density, temperature and chlorides pH indicator graph of relation edition, determining rational drilling fluid density and chlorides concentration to overcame salt bed creepage according to steps 6 graph of relation edition to salt bed well drilling in same zone block with experiment well core.

Description

technical field [0001] The invention relates to a method for overcoming creep of salt rock formation by utilizing the relationship between drilling fluid density and chlorine root concentration. Background technique [0002] At present, in the process of oil drilling, the salt layer encountered is deeply buried, thick and discontinuous, and high-density drilling fluid is required to control the creep of the salt layer. Therefore, the density of the drilling fluid cannot be high, which makes it difficult to control the creep of the salt layer for the saturated brine drilling fluid. [0003] For this reason, the creators of the present invention rely on their years of experience and practice in related industries, and through painstaking research and development, finally create a method that utilizes the relationship between drilling fluid density and chloride concentration to overcome salt rock formation creep. This method can rationally use chlorine root concentration and u...

Claims

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Application Information

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IPC IPC(8): E21B21/00E21B21/06C09K8/04G06F17/00
Inventor 金衍陈勉张广清
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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