SU945399A1 - Method of monitoring seam absorption and manifestations at well-drilling - Google Patents

Description

(54) METHOD OF CONTROL OF ABSORPTIONS AND MANIFESTATIONS OF PLASTES IN DRILLING WELLS

The invention relates to a drilling technique, in particular, to methods for determining the intervals and the intensity of the absorption of industrial fluid or the production of formations during the drilling of oil and gas wells.

 A known method for determining the occurrence of formation during drilling, BKJHO-; registering the flow rate of the flux fluid at the wellhead and the release of permeable reservoirs along the anomaly m in the flow curve

The disadvantage of this method is the need to install pro-. the drilling process to determine the magnitude of the occurrence or magnitude of the formations. The beginning of the absorption, as a rule, occurs at the moment of drilling, and if the absorption of significant intensity is not detected in time, this can lead to an emergency situation.

The closest to the proposed method is a method for determining the intervals and intensity of absorption of washing fluid and formations during drilling, including recording the ratio of the costs of the washing fluid injected into the well and leaving the washing fluid.

in a receiving barn, for example, ground C2}.

The disadvantage of this method is the low accuracy of determining the intervals of complications and the intensity of absorption or manifestation of the formations, since the receiving barn has considerable dimensions. During the cold period, due to climatic conditions (snow and ice cover in the barn), as well as as a result of the deposition of sludge from the washing liquid and filtration of the liquid through the walls of the barn, to record the ratio of the flow rate of the injected and outgoing accuracy is difficult and difficult.

The aim of the invention is to improve the accuracy of determining the intervals and the intensity of acquisitions and manifestations of formations in drilling wells.

This goal is achieved by

25 that, according to the method, heat is pumped into the fluid being injected into and out of the well, temperature differences, proportional to the cooling of the fluid output from the well, are measured and compared and heated

the injected one, and judging by the comparison result, the cost ratio is judged.

The drawing shows the device used to carry out the proposed method.

The device contains a heat exchanger 1, connected by the first entrance to the wellhead, the second input 3 to the receiving barn 4, the first output 5 is open at the outflow of fluid into the receiving barn, the second output b is connected to the receiving pipe of the drilling pump 7.

Thermal receivers 8-I, respectively (for example, resistance thermometers with 100 Om each at 100 ohms), having the same temperature characteristics, are installed at in, moves 2 and 3, and outputs 5 and b of the heat exchanger. Thermal receivers are connected to the measuring panel 12 by an electrical communication channel.

In order to reduce heat losses to the environment and thereby improve the accuracy of determining acquisitions and manifestations during drilling, the device has thermal insulation 13.

When drilling a well, the circulation of fluid is carried out as follows.

From the receiving barn 4, the cold flushing fluid moves to the inlet 3, where the thermal receiver 9 is installed, and then through the heat exchanger to the outlet 6, where the thermal receiver is installed to the pump 7, which is pumped into the drilling well. The excess fluid from the well goes to the entrance where the thermal receiver 8 is installed, into the heat exchanger, and then to exit-5, where the thermal receiver H is located, from where it is sent to the receiving barn.

At the same time, the colder flushing of the liquid from the receiving barn is cooler, the passage of the heat exchanger, the heating of the heat or the hot liquid coming from the well in the heat exchanger is cooled. The temperature difference between the heated and cooled fluids is recorded by thermal receivers 9, 11 and 8, 10. Heat energy from the heat flushing fluid coming from the well is transferred to the heat exchanger cooler pumped into the well.

Therefore, for two fluid streams passing through a heat exchanger, the heat balance is expressed by the following relationship:

.

V

or

Wed-At, & t

L.I

where N is the heat energy transferred from the heat flushing fluid to the colder one pumped into the well, kW;

R.

respectively, the heat capacity of warm and cold liquids, kJ / kgGrad; respectively mass

Expenditures of warm and cold liquids, CS / s;

At, bt - change in temperature of warm and cold liquids, K,

One and the same washing liquid is involved in the heat exchange, the circulation of which is closed and takes place from the barn through the heat exchange, pump, well, well, heat exchanger to the barn. Therefore, the heat capacities Cp and Cp, j are practically unchanged, i.e. .

Then the correlation between the mass flow rate and the change in temperature of the injected and drained (from the well liquids will take the form

Atg. njjL

t m

L1-1 f

where -r- is the ratio between the change in temperature in the heat exchanger of thermal (At) and cold (Atg) liquids;

S1

t. - the ratio between the mass flow rate of warm t and cold t of liquids.

The output signals of the thermal receivers 8, 10, 9.И11 are proportional to the flow temperatures at the inlets and outlets of the heat exchanger.

The difference between the output signals of thermal receivers 8 and 10 is proportional to the cooling of a warm liquid by the amount of At, and the thermal receivers 9 and 11 - to the heating of the cold liquid by the value of At jj.

When during drilling there are no acquisitions and manifestations, the mass flow rate of the fluid leaving the well is equal to the flow rate of the injected fluid. In this case . and the output signals of the thermal receivers, which are recorded by the measuring panel 2, are the same. In the case of fluid absorption, the mass flow rate of the fluid flowing out of the well is less than pumped: (.) Then the output signals of the thermal receivers differ in the direction of absorption of the washing fluid. In this case, i.e. weekends

Claims (1)

Claim A method for controlling absorption and formation manifestations during well drilling, based on determining the ratio of flow rates of drilling fluid injected into the well and outgoing fluid, characterized in that, in order to improve the accuracy of determining the intervals and intensity of 5 absorption and formation manifestations, heat is transferred to and from the reservoir fluid wells, measure and compare temperature differences proportional to the cooling10 of the fluid exiting the well and heating the fluid being injected, and judging by the result of the comparison ootnoshenii costs.