Controlling Studies Of Ground Stress On Off-take Potential Of Gas Reservior

Theory about ground stress has been applying to exploratory development, however, application of ground stress is in start stage yet in some aspect. This paper firstly apply ground stress to off-take potential estimate and discuss the relation between ground stress and off-take potential in detail, taking JiaEr gas reservoir in moxi field as an example.JiaEr gas reservoir in Moxi field is a carbonatite gas reservoir with characteristic of surpressure, low penetrability. This gas reservoir have complex relation of gas/water and a great difference of gas well off-take potential. This paper caculated the porosity and gas saturation by optimization well logging interpretation and multianalysis gas/water recognition with conventional well logging data, and then, caculated ground stress with software developed by author. based on above work, all kind of index have be caculated, and then distribute the index on the plane of develop zones. And then ground stress multiplied by unit reservoir factor reflected gas reservoir actual off-take potential was discovered by comparing the index with reservoir actual production of gas and water. At last in the paper, the author discussed the control role of ground stress to gas reservoir off-take potential.By synthetically analyzing the datum of literature study, experiment, software develop, conventional logging, imaging logging, hydrofracturing, etc, the paper acquired advancement as follows.(1) In calculation of lithomechanics parameter, on the basis of summarizing former experiential formula, a new formula of compressing strength on rock acquired. the new formula include information of rock density, acoustic velocity and content of clay and the result caculated by the new formulation is greatly in accord with the practice.(2) The interpret of permeability by conventional logging was disagree with practice when fitting perm with porosity, specially to low penetrability carbonatite gas reservoir in this area. This paper firstly fits the perm with prorosity, resistance, content of clay, improved accuracy degree of interpretation of perm by conventional logging.(3) The paper firstly put forward space distribution by using conventional logging and synthetically evaluated off-take potential potential reservoir bed with unit reservoir factor, and ground stress, so that, reservoir bed can be recognized more fully and impersonally.(4) The paper firstly combine ground stress and off-take potential of oil-field development, the paper analyzed the relation among ground stress, off-take potential and micro-fracture, discussed the control role of ground stress to gas off-take potential in low penetrability, carbonatite gas reservoir.